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  • Polymer and Materials Science  (14,995)
  • Humans  (4,689)
  • Magnetism  (3,743)
  • Geophysics
  • 2020-2024  (29)
  • 2015-2019  (5,931)
  • 1995-1999  (19,005)
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  • 1
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    VECTOR seismic array in the Irish Midlands (2024)
    GFZ Data Services
    Details
    Publication Date: 2024-04-26
    Description: Abstract
    Description: A network of 210 continuously running, digital seismic stations equipped with short-period sensors (200 stations) and broadband sensors (10 stations) was deployed in an area of ~8 x ~6 km in the Irish Midlands (north of Collinstown) for a time period of ~6 weeks. The network was part of the EU project VECTOR (https://vectorproject.eu) aiming to investigate – among others – possible solutions for least invasive forms of exploration for mineral resources. In this context the collected data was mainly used to derive a 3D model of the subsurface (seismic shear wave velocity) using ambient noise tomography (down to ~1.5km depth). We thank all field crews for their excellent work rendered to the project. Waveform data is available from the GEOFON data centre, under network code 7W, and is embargoed until Feb 2025.
    Keywords: EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES ; In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS 〉 SEISMOLOGICAL STATIONS ; Seismometers ; Geophone[g] ; Velocity ; MiniSEED ; Passive seismic ; GIPP ; MESI ; Raw[g] ; Local network ; Vertical component[g] ; Three-component[g] ; Land[g] ; Geophysics ; Natural
    Type: Dataset , Seismic Network
    Format: ~300G
    Format: .mseed
    Format: XML
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  • 2
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    Geophysical Imaging of Deep EarthShape (GIDES): Seismic data of the Private Reserve Santa Gracia, Chile (2024)
    GFZ Data Services
    Details
    Publication Date: 2024-06-18
    Description: Abstract
    Description: The dataset contains the seismic weight drop data acquired in Private Reserve Santa Gracia, Chile. The data acquisition was conducted as a part of the EarthShape project in the subproject of Geophysical Imaging of the Deep EarthShape (GIDES). The seismic line was setup to cut across an existing borehole location with core and geophysical logging data available (Krone et al., 2021; Weckmann et al., 2020). The data was acquired to image the deep weathering zone identified by the borehole data across the seismic profile. Included in the datasets are the raw data of the CUBE data logger, SEG-Y data of the recorded shots, and the shot and receiver geometry data. A vital aspect of comprehending the interplay between geological and biological processes lies in the imaging of the critical zone, located deep beneath the surface, where the transition from unaltered bedrock to fragmented regolith occurs. It had been hypothesized that the depth of such weathering zone is dependent on the climate condition of the area. A more humid climate with higher precipitation will result in a deeper weathering front. As a part of the EarthShape project (SPP-1803 ‘EarthShape: Earth Surface Shaping by Biota’), specifically the Geophysical Imaging of the Deep EarthShape (GIDES - Grant No. KR 2073/5-1), we aim to image the weathering zone using the geophysical approach. Using the seismic method, we can differentiate different weathered layers based on the seismic velocity while also providing a 2D subsurface image of the critical zone. We conducted a seismic weight drop experiment in the Private Reserve Santa Gracia, Chile, to observe the depth of the weathering zone in a semi-arid climate and compare the resulting model with existing borehole data (Krone et al., 2021; Weckmann et al., 2020). The acquired data can then be used for multiple seismic imaging techniques, including body wave tomography and multichannel analysis of surface waves.
    Description: Other
    Description: The DFG Priority Program 1803 "EarthShape - Earth Surface Shaping by Biota" (2016-2022; https://www.earthshape.net/) explored between scientific disciplines and includes geoscientists and biologists to study from different viewpoints the complex question how microorganisms, animals, and plants influence the shape and development of the Earth’s surface over time scales from the present-day to the young geologic past. All study sites are located in the north-to-south trending Coastal Cordillera mountains of Chile, South America. These sites span from the Atacama Desert in the north to the Araucaria forests approximately 1300 km to the south. The site selection contains a large ecological and climate gradient ranging from very dry to humid climate conditions.
    Keywords: Geophysics ; seismic ; weight drop ; weathering zone ; critical zone ; bedrock ; granite ; passive seismic ; 3C sensor ; EarthShape ; Chile ; Coastal Cordillera ; Private Reserve Santa Gracia ; CONTROLLED_SOURCE_SEISMOLOGY 〉 REFRACTION ; CONTROLLED_SOURCE_SEISMOLOGY 〉 WEIGHT-DROP_SOURCE ; CONTROLLED_SOURCE_SEISMOLOGY 〉 NEAR_SURFACE ; PASSIVE_SEISMIC 〉 STATIONS ; SENSOR 〉 GEOPHONE ; SENSOR 〉 3-C ; LAND ; SEG-Y_DATA_FORMAT ; MINISEED_DATA_FORMAT ; CONTROLLED_SOURCE_SEISMOLOGY 〉 RAW_DATA ; CONTROLLED_SOURCE_SEISMOLOGY 〉 VERTICALLY_STACKED_DATA ; EARTH SCIENCE 〉 SOLID EARTH ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES 〉 SEISMIC PROFILE
    Type: Dataset , Dataset
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  • 3
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    Non-Intrusive Methodologies for Large Area Urban Research (2023)
    Archaeopress Publishing Ltd
    Details
    Publication Date: 2024-04-04
    Description: Non-Intrusive Methodologies for Large Area Urban Research brings together contributions from a conference held in 2021 in association with the ERC-funded ‘Rome Transformed’ research project. The papers address a major challenge in archaeology. Non-intrusive research in pursuit of a deeper understanding of urban areas can be both richly informative and cost-effective. Multiple successes in the field have led to an impressive array of innovative methodologies, methodologies that are frequently combined for still greater insight and impact. Geophysical surveys, the use of UAVs, the study of exposed historic structures and the exhaustive examination of archival records can all play a vital role, and the development of these data capture methodologies is of the utmost importance for the future of research. As well as advances in data capture methodologies, however, the papers also present case studies in the management of the big data generated and in the integration of different methodologies. A further strength of this collection lies in the range of site types considered. While many projects have historically pursued non-intrusive research in areas relatively clear of modern buildings, a growing number of research initiatives, such as ‘Rome Transformed’ are seeking to advance them in areas which remain densely occupied. Accordingly the material presented here will also be of interest to non-archaeologists working in such diverse fields as civil engineering, urban planning and physical geography.
    Keywords: Social Science ; Archaeology ; Science ; Physics ; Geophysics ; Computers ; Data Science ; Data Analytics ; thema EDItEUR::N History and Archaeology::NK Archaeology ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVG Geophysics ; thema EDItEUR::U Computing and Information Technology::UN Databases::UNF Data mining
    Language: English
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  • 4
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    Volcano monitoring with magnetic measurements: a simulation of eruptions at axial seamount, Kilauea, Baroarbunga, and Mount Saint Helens (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-03-11
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biasi, J., Tivey, M., & Fluegel, B. Volcano monitoring with magnetic measurements: a simulation of eruptions at axial seamount, Kilauea, Baroarbunga, and Mount Saint Helens. Geophysical Research Letters, 49(17), (2022): e2022GL100006, https://doi.org/10.1029/2022GL100006.
    Description: Monitoring of active volcanic systems is a challenging task due in part to the trade-offs between collection of high-quality data from multiple techniques and the high costs of acquiring such data. Here we show that magnetic data can be used to monitor volcanoes by producing similar data to gravimetric techniques at significantly lower cost. The premise of this technique is that magma and wall rock above the Curie temperature are magnetically “transparent,” but not stationary within the crust. Subsurface movements of magma can affect the crustal magnetic field measured at the surface. We construct highly simplified magnetic models of four volcanic systems: Mount Saint Helens (1980), Axial Seamount (2015–2020), Kīlauea (2018), and Bárðarbunga (2014). In all cases, observed or inferred changes to the magmatic system would have been detectable by modern magnetometers. Magnetic monitoring could become common practice at many volcanoes, particularly in developing nations with high volcanic risk.
    Description: This work was supported by the NSF Grant No 2052963 to J. Biasi and an internal Woods Hole Oceanographic Institution grant to M. Tivey.
    Keywords: Magnetism ; Volcanic hazards ; Hawaii ; Iceland ; Volcanology ; Monitoring
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 5
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    Least-Squares Reverse Time Migration in Pseudodepth Domain and Its Application (2023)
    China University of Petroleum (East China)
    Details
    Publication Date: 2023-01-10
    Description: The Cartesian-based least squares reverse time migration (LSRTM) aims to obtain a relatively high-resolution amplitude preserving imaging by calculating and solving the Hessian matrix. In addition, conjugate gradient algorithm is proved to be an efficient iterative method, which makes the traditional LSRTM feasible in practical data processing applications. Each iteration process of LSRTM includes two main parts; The first part is the forward simulation of wavefield, and the second part is the back propagation of wavefield. However, the calculation of these two parts takes a lot of time, and oversampling effects will occur in the calculation process. The thesis develops a smooth understanding of the LSRTM scheme in pseudodepth domain and gives information about this type of wavefield extrapolation method to achieve amplitude-preserved image with low computational costs in terms of memory and time. The underground media faced by seismic exploration usually include low velocity bodies, high steep structures and pore fracture units. When simulating the seismic wavefield in these media, in order to ensure the simulation accuracy and computational stability by finite difference methods, the grid spacing needs to be very small, which leads to the oversampling problem of the traditional finite difference forward simulation method in Cartesian coordinate system. In order to overcome this problem, the pseudo depth domain algorithm is applied to the least-squares reverse time migration to improve its computational efficiency. The problem of stabilizing this Pseudodepth wavefield arises from the introduction of the mapping function and velocity and also the vertical axis operator that converts the finite difference solution partially from time into frequency domains. Stability and convergence analysis suggests that the spatial derivatives of Riemannian axis should be approximated by a mixed Fourier pseudo-spectral and ordinary finite-difference schemes methods using a special Gaussian-like impulse function to generate the vector-matrix of the complex source term within the finite-difference operator, in addition to the mapping velocity, which is a differential form of the initial input velocity model, manifestly controls the CFL conditions of the associated Riemannian-finite difference operator. Numerical and synthetic examples indicated that this approach is more stable and efficient in extrapolating a smooth Riemannian wavefield while maintaining Claerbout’s principle for locating subsurface reflectors also choosing an appropriate sampling rate for the new vertical axis is related inversely by the maximum frequency of the impulse wavelet and directly with minimum velocity value in the given model. The LSRTM wavefield extrapolation usually uses the two-dimensional constant density acoustic wave equation, by considering the change of velocity field distribution, and converts it to the corresponding pseudodepth domain, so as to solve the oversampling problem in the true depth domain. For each point in the Cartesian coordinate system, there is a corresponding point in the pseudo depth domain. Therefore, we can interpolate and remodel the reconstructed finite difference modelled wavefield in the new coordinate system through the Cartesian-to-pseudodepth mapping function. Regardless of the applied finite difference algorithm and boundary conditions, wavefield extrapolation in pseudodepth domain can ensure high accuracy and efficiency. Through the test of synthetic and actual data, compared with the traditional LSRTM results, pseudodepth domain LSRTM shows great potentiality in amplitude preserving imaging. On the other hand, pseudodepth domain LSRTM has great advantages in computational efficiency and ensures computational accuracy.
    Description: Masters
    Description: 基于笛卡尔的最小二乘逆时偏移（LSRTM）旨在通过计算和求解Hessian矩阵获得相对高分辨率和保幅的成像。此外，共轭梯度算法被证明是一种有效的迭代方法，这使得传统的LSRTM在实际数据处理应用中是可行的。LSRTM的每个迭代过程包括两个主要部分；第一部分是波场的正演模拟，第二部分是波场的反向传播。然而，这两部分的计算需要花费大量时间，并且在计算过程中会出现过采样效应。本论文对伪深度域LSRTM方法进行了研究，给出了该方法波场外推的信息，获取了保幅的图像，并且该方法有较低的内存和时间成本。 地震勘探面临的地下介质通常包括低速体、高陡构造和孔隙裂隙单元。在模拟这些介质中的地震波场时，为了保证有限差分法的模拟精度和计算稳定性，需要非常小的网格间距，这导致了传统的笛卡尔坐标系有限差分正演模拟方法的过采样问题。为了克服这一问题，将伪深度域算法应用于LSRTM，以提高其计算效率。伪深度域波场稳定是因为引入了映射函数和速度，还有垂直轴算子，并将有限差分解从时间域转换为频率域。稳定性和收敛性分析表明，除了映射速度之外，黎曼轴的空间导数还应该通过傅里叶伪谱方法来近似，该方法使用一种特殊的类高斯脉冲函数来生成有限差分算子内复数震源项的向量矩阵，它是初始输入速度模型的微分形式，控制相关黎曼有限差分算子的CFL条件。合成数据的例子表明，这种方法在推导平滑的黎曼波场时更加稳定和高效，同时保持了Claerbout地下反射体的定位原则，也为新纵轴选择了合适的采样率，该采样率与脉冲小波的最大频率成反比，与给定模型中的最小速度值直接相关。 LSRTM波场外推法采用二维常密度声波方程，通过考虑速度场分布的变化，将其转换为相应的伪深度域，从而解决真深度域的过采样问题。对于笛卡尔坐标系中的每个点，伪深度域中都有一个对应点。因此，我们可以通过笛卡尔到伪深度映射函数，在新坐标系下对重建的有限差分模拟波场进行插值和重塑。无论采用何种有限差分算法和边界条件，伪深度域的波场外推都能保证较高的精度和效率。通过对合成数据和实际数据的测试，与传统的LSRTM结果相比，伪深度域LSRTM在保幅成像方面显示出巨大的潜力。另一方面，伪深度域LSRTM在计算效率和计算精度方面也有很大优势。
    Keywords: Geophysics ; Seismic Waves Propagationa and Imaging
    Repository Name: AquaDocs
    Type: Thesis/Dissertation
    Format: 93
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  • 6
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    Wide-angle seismic data (“fixed spread”) from the Oct. 2020 3D survey across the Ivrea Zone, Italy (project SEIZE) (2023)
    GFZ Data Services
    Details
    Publication Date: 2023-06-21
    Description: Abstract
    Description: This data publication contains part of a seismic survey collected across the Ivrea Zone, Italy, in October 2020. Within the research project SEIZE (SEismic Imaging of the Ivrea ZonE), this high-resolution seismic campaign investigates the upper 5 km of the subsurface under and around the commune of Balmuccia (Val Sesia, Piemont region). The aim is to provide the best in situ geophysical image and physical properties of the subsurface as well as to calibrate future observations made during the planned ICDP drilling (https://www.icdp-online.org/projects/by-continent/europe/dive-italy, http://www.dive2ivrea.org/). Seismic Data, including raw, mini-seed and SEG-Y files, of a part of a controlled-source 3D survey in Northern Italy, Ivrea Zone, based on 432 Vibroseis sources recorded by a fixed spread of 110 receivers.
    Keywords: Geophysics ; controlled-source seismic survey ; Alps ; Vibroseis ; CONTROLLED_SOURCE_SEISMOLOGY 〉 REFLECTION ; CONTROLLED_SOURCE_SEISMOLOGY 〉 REFRACTION ; CONTROLLED_SOURCE_SEISMOLOGY 〉 WIDE-ANGLE_REFLECTION_REFRACTION ; CONTROLLED_SOURCE_SEISMOLOGY 〉 VIBRO_SOURCE ; CONTROLLED_SOURCE_SEISMOLOGY 〉 LOCAL_SCALE ; CONTROLLED_SOURCE_SEISMOLOGY 〉 RESERVOIR_SCALE ; CONTROLLED_SOURCE_SEISMOLOGY 〉 NEAR_SURFACE ; SENSOR 〉 GEOPHONE ; SENSOR 〉 VERTICAL_COMPONENT ; SENSOR 〉 3-C ; SEG-Y_DATA_FORMAT ; SEISMIC_WAVEFORM_DATA ; CONTROLLED_SOURCE_SEISMOLOGY 〉 RAW_DATA ; CONTROLLED_SOURCE_SEISMOLOGY 〉 CORRELATED_DATA ; CONTROLLED_SOURCE_SEISMOLOGY 〉 VERTICALLY_STACKED_DATA ; EARTH SCIENCE 〉 SOLID EARTH ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES 〉 SEISMIC PROFILE
    Type: Dataset , Dataset
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  • 7
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    Transient Electromagnetic Data of the Aurus Clay Pan, Namibia (2023)
    CRC1211 Database (CRC1211DB)
    Details
    Publication Date: 2023-08-16
    Description: SeriesInformation
    Description: This dataset contains transient data from a transient electromagnet field survey to the Aurus clay pan in the Sperrgebiet in the southern Namib Desert, Namibia. Using this data resistivity models of the subsurface can be calculated and the geometry and sedimentary thickness of the clay pan can be imaged. Measurements were carried out along two profiles using the TEM-FAST 48. The coincident loop setup was used with a loop size of (50 x 50) m^2. The transient data is provided in ASCII-format. All coordinates can be found in the kmz-file. Additionally, two figures are provided that show 1D inversion results of each profile.
    Keywords: Geoscientific Information ; Transient Electromagnetic method (TEM) ; Geophysics
    Type: Dataset , Dataset
    Format: ASCII
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  • 8
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    Seismicity catalogue for the Eastern Alps (Swath-D) (2023)
    GFZ Data Services
    Details
    Publication Date: 2023-09-01
    Description: Abstract
    Description: We present a new, consistently processed seismicity catalogue for the Eastern and Southern Alps, based on the temporary dense Swath-D monitoring network. The final catalogue includes 6,053 earthquakes for the time period 2017-2019 and has a magnitude of completeness of −1.0ML. The smallest detected and located events have a magnitude of −1.7ML. Aimed at the low to moderate seismicity in the study region, we generated a multi-level, mostly automatic workflow which combines a priori information from local catalogues and waveform-based event detection, subsequent efficient GPU-based event search by template matching, P & S arrival time pick refinement and location in a regional 3-D velocity model. The resulting seismicity distribution generally confirms the previously identified main seismically active domains, but provides increased resolution of the fault activity at depth. In particular, the high number of small events additionally detected by the template search contributes to a more dense catalogue, providing an important basis for future geological and tectonic studies in this complex part of the Alpine orogen.
    Description: TableOfContents
    Description: Seismicity catalogue Python codes & metadata Seismicity cross-sections
    Keywords: Seismology ; Seismic Waveform Analysis ; Eastern Alps ; Earthquake ; Geophysics ; Template matching ; 4DMB ; 4D Mountain Building ; EARTH SCIENCE ; EARTH SCIENCE 〉 SOLID EARTH ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES 〉 EARTHQUAKE MAGNITUDE/INTENSITY ; EARTH SCIENCE 〉 SOLID EARTH 〉 TECTONICS 〉 EARTHQUAKES 〉 EARTHQUAKE OCCURRENCES ; geophysics ; seismology ; surface processes ; tectonics
    Type: Dataset , Dataset
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  • 9
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    Hidden Depths (2022)
    White Rose University Press | White Rose University Press
    Details
    Publication Date: 2022-12-06
    Description: In Hidden Depths, Professor Penny Spikins explores how our emotional connections have shaped human ancestry. Focusing on three key transitions in human origins, Professor Spikins explains how the emotional capacities of our early ancestors evolved in response to ecological changes, much like similar changes in other social mammals. For each transition, dedicated chapters examine evolutionary pressures, responses in changes in human emotional capacities and the archaeological evidence for human social behaviours. Starting from our earliest origins, in Part One, Professor Spikins explores how after two million years ago, movement of human ancestors into a new ecological niche drove new types of collaboration, including care for vulnerable members of the group. Emotional adaptations lead to cognitive changes, as new connections based on compassion, generosity, trust and inclusion also changed our relationship to material things. Part Two explores a later key transition in human emotional capacities occurring after 300,000 years ago. At this time changes in social tolerance allowed ancestors of our own species to further reach out beyond their local group and care about distant allies, making human communities resilient to environmental changes. An increasingly close relationship to animals, and even to cherished possessions, appeared at this time, and can be explained through new human vulnerabilities and ways of seeking comfort and belonging. Lastly, Part Three focuses on the contrasts in emotional dispositions arising between ourselves and our close cousins, the Neanderthals. Neanderthals are revealed as equally caring yet emotionally different humans, who might, if things had been different, have been in our place today. This new narrative breaks away from traditional views of human evolution as exceptional or as a linear progression towards a more perfect form. Instead, our evolutionary history is situated within similar processes occurring in other mammals, and explained as one in which emotions, rather than ‘intellect’, were key to our evolutionary journey. Moreover, changes in emotional capacities and dispositions are seen as part of differing pathways each bringing strengths, weaknesses and compromises. These hidden depths provide an explanation for many of the emotional sensitivities and vulnerabilities which continue to influence our world today.
    Keywords: Human demography ; Group size ; Lithic transfers ; Raw material movements ; Bonobos ; Dog burial ; Comfort ; Symbolic objects ; Symbolism ; Mobiliary art ; Attachment fluidity ; Hypersociability ; Human-animal relationships ; Dog domestication ; Attachment object ; Approachability ; Approach behaviour ; Avoidance behaviour ; Androgens ; Physiological responses ; Cognitive Archaeology ; Autism Spectrum Condition ; Handaxe ; Biface ; Neurodiversity ; Palaeolithic stone tools ; Evolution of neurodiversity ; Rock art ; Ice age art ; Material Culture ; Cultural transmission ; Emotional commitment ; Biopsychosocial approach ; Social tolerance ; Attachment ; Genus Homo ; Acheulian ; Cultural evolution ; Skeletal abnormality ; Injury ; Illness ; Interdependence ; Emotional sensitivity ; Moral emotions ; Evolution of Altruism ; Hominins ; Upper Palaeolithic ; Lower Palaeolithic ; Ecological niche ; Selective pressure ; Behavioural ecology ; Wolves ; Affective empathy ; Cognitive empathy ; Theory of mind ; Human Cognition ; Vulnerability ; Evolutionary Psychology ; Developmental psychology ; Helping behaviours ; Social cognition ; Social mammals ; Human Emotion ; Human social collaboration ; Generosity ; Emotional brain ; Social emotions ; Comparative behaviour ; Evolution ; Social carnivores ; Primate behavioural ecology ; Primate social systems ; Human Evolution ; Human ancestors ; Collaboration ; Evolutionary Biology ; Emotional vulnerability ; Social connection ; Decolonisation ; Social networks ; Middle Palaeolithic ; Community resilience ; Convergent evolution ; Chimpanzee ; Origin of modern humans ; Social safeness ; Wolf domestication ; Cherished possessions ; Compensatory attachment ; Loneliness ; Palaeolithic art ; Stress reactivity ; Bonding hormones ; Humans ; Hunter-gatherers ; Intergroup collaboration ; Tolerance ; Emotional connection ; Autism ; Trust ; Early Prehistory ; Palaeopathology ; Origins of healthcare ; Human self-domestication ; Palaeolithic Archaeology ; Social brain ; Care-giving ; Empathy ; Neanderthals ; Compassion ; Social Connection ; Evolution of Emotions ; Human Origins ; Adaptation ; Prehistory ; bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHM Anthropology ; bic Book Industry Communication::H Humanities::HD Archaeology ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSA Life sciences: general issues::PSAF Ecological science, the Biosphere ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSA Life sciences: general issues::PSAJ Evolution ; bic Book Industry Communication::J Society & social sciences::JP Politics & government::JPW Political activism::JPWQ Revolutionary groups & movements ; bic Book Industry Communication::J Society & social sciences::JM Psychology
    Language: English
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  • 10
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    Frankenstein (2022)
    The MIT Press | The MIT Press
    Details
    Publication Date: 2024-03-27
    Description: The original 1818 text of Mary Shelley's classic novel, with annotations and essays highlighting its scientific, ethical, and cautionary aspects. Mary Shelley's Frankenstein has endured in the popular imagination for two hundred years. Begun as a ghost story by an intellectually and socially precocious eighteen-year-old author during a cold and rainy summer on the shores of Lake Geneva, the dramatic tale of Victor Frankenstein and his stitched-together creature can be read as the ultimate parable of scientific hubris. Victor, “the modern Prometheus,” tried to do what he perhaps should have left to Nature: create life. Although the novel is most often discussed in literary-historical terms—as a seminal example of romanticism or as a groundbreaking early work of science fiction—Mary Shelley was keenly aware of contemporary scientific developments and incorporated them into her story. In our era of synthetic biology, artificial intelligence, robotics, and climate engineering, this edition of Frankenstein will resonate forcefully for readers with a background or interest in science and engineering, and anyone intrigued by the fundamental questions of creativity and responsibility. This edition of Frankenstein pairs the original 1818 version of the manuscript—meticulously line-edited and amended by Charles E. Robinson, one of the world's preeminent authorities on the text—with annotations and essays by leading scholars exploring the social and ethical aspects of scientific creativity raised by this remarkable story. The result is a unique and accessible edition of one of the most thought-provoking and influential novels ever written. Essays by Elizabeth Bear, Cory Doctorow, Heather E. Douglas, Josephine Johnston, Kate MacCord, Jane Maienschein, Anne K. Mellor, Alfred Nordmann
    Keywords: science fiction ; gothic ; horror ; European ; British ; literature ; fiction ; cautionary tale ; STEM ; science ; bioethics ; classic ; bicentennial ; Josephine Johnston ; Cory Doctorow ; Jane Maienschein ; Kate MacCord ; Alfred Nordmann ; Elizabeth Bear ; Anne K. Mellor ; Heather E. Douglas ; Frankenstein ; Creature ; Monster ; Mary Shelley ; Makers ; women in science ; science and anti-science ; values in science ; responsible innovation ; Industrial Revolution ; Mary Wollstonecraft ; William Godwin ; Percy Bysshe Shelley ; Galvanism ; Mount Tambora ; Myths ; Two Cultures ; epistolary novel ; Victor Frankenstein ; Geneva ; Prometheus ; Arctic ; Lord Byron ; John Polidori ; ghost stories ; Revisions ; Electricity ; Lightning ; Vitalism ; Chemistry ; Extinction ; Magnetism ; Moral responsibility ; Legal responsibility ; Social responsibility ; Consequences ; Obligations ; Ethics ; Maker Culture ; DIY ; Technology Adjacent Possible ; Facebook ; Surveillance ; Aristotle ; Fetal development ; Epigenesis ; Embryo ; Person ; Technoscience ; Alchemy ; uncanny valley ; animation ; complexity ; Morality ; Monstrosity ; Christianity ; Otherness ; Gender ; Nature ; Domestic Affections ; Women ; Sexuality ; Technical Sweetness ; Los Alamos ; Trinity Test ; Scientific Responsibility ; Nuclear Weapons ; adjacent possible ; synthetic biology ; robotics ; thema EDItEUR::F Fiction and Related items::FB Fiction: general and literary::FBC Classic fiction: general and literary ; thema EDItEUR::F Fiction and Related items::FL Science fiction::FLC Classic science fiction
    Language: English
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  • 11
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    Pacific Climate Cultures (2022)
    De Gruyter | De Gruyter Open Poland
    Details
    Publication Date: 2022-11-22
    Description: This edited volume examines the opportunities to think, do, and/or create jointly afforded by digital storytelling. The contributors discuss digital storytelling in the context of educational programs, teaching anthropology, and ethnographic research involving a variety of populations and subjects that will appeal to researchers and practitioners engaged with qualitative methods and pedagogies that rely on media technology.
    Keywords: Discourse ; Climate Change ; Humans ; Nature ; Oceania ; Resilience ; Environmental Ethics ; Environmental Change ; Worldview ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFF Social issues & processes::JFFC Social impact of disasters ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFH Popular beliefs & controversial knowledge::JFHF Folklore, myths & legends ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFS Social groups::JFSL Ethnic studies::JFSL9 Indigenous peoples ; bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHB Sociology::JHBD Population & demography ; bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHM Anthropology ; bic Book Industry Communication::P Mathematics & science::PS Biology, life sciences::PSX Human biology::PSXM Medical anthropology
    Language: English
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    How nature shaped echolocation in animals (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-03-31
    Description: Echolocation has evolved in different groups of animals, from bats and cetaceans to birds and humans, and enables localization and tracking of objects in a dynamic environment, where light levels may be very low or absent. Nature has shaped echolocation, an active sense that engages audiomotor feedback systems, which operates in diverse environments and situations. Echolocation production and perception vary across species, and signals are often adapted to the environment and task. In the last several decades, researchers have been studying the echolocation behavior of animals, both in the air and underwater, using different methodologies and perspectives. The result of these studies has led to rich knowledge on sound production mechanisms, directionality of the sound beam, signal design, echo reception and perception. Active control over echolocation signal production and the mechanisms for echo processing ultimately provide animals with an echoic scene or image of their surroundings. Sonar signal features directly influence the information available for the echolocating animal to perceive images of its environment. In many echolocating animals, the information processed through echoes elicits a reaction in motor systems, including adjustments in subsequent echolocation signals. We are interested in understanding how echolocating animals deal with different environments (e.g. clutter, light levels), tasks, distance to targets or objects, different prey types or other food sources, presence of conspecifics or certain predators, ambient and anthropogenic noise. In recent years, some researchers have presented new data on the origins of echolocation, which can provide a hint of its evolution. Theoreticians have addressed several issues that bear on echolocation systems, such as frequency or time resolution, target localization and beam-forming mechanisms. In this Research Topic we compiled recent work that elucidates how echolocation – from sound production, through echolocation signals to perception- has been shaped by nature functioning in different environments and situations. We strongly encouraged comparative approaches that would deepen our understanding of the processes comprising this active sense.
    Keywords: QP1-981 ; Q1-390 ; bats ; Biosonar ; Humans ; marine mammals ; sensory biology ; Birds ; Behavior ; Communication ; thema EDItEUR::M Medicine and Nursing::MF Pre-clinical medicine: basic sciences::MFG Physiology
    Language: English
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    The Australian Continent (2021)
    ANU Press
    Details
    Publication Date: 2024-03-23
    Description: The Australian Continent: A Geophysical Synthesis is designed to provide a summary of the character of the Australian continent through the extensive information available at the continental scale, as a contribution to the understanding of Australia's lithospheric architecture and its evolution.The results build on the extensive databases assembled at Geoscience Australia, particularly for potential fields, supplemented by the full range of seismological information, mostly from The Australian National University. To aid in cross comparison of results from different disciplines, information is presented with a common projection and scales.
    Keywords: Australia ; Geophysics ; thema EDItEUR::1 Place qualifiers::1M Australasia, Oceania, Pacific Islands, Atlantic Islands::1MB Australia and New Zealand / Aotearoa ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVG Geophysics ; thema EDItEUR::R Earth Sciences, Geography, Environment, Planning::RB Earth sciences
    Language: English
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    Chocolate and Health: Friend or Foe? (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-03-30
    Description: In the ancient past, cocoa has been appreciated as a high-calorie food to boost energy in soldiers and for its undefined medicinal and mystical properties. During other times, chocolate has been considered as the forbidden “food of God”: a treasure of pleasure for the mind and the soul. The overall perception of the consumer for chocolate was of a “charming” and appealing food with lots of negative aspects related to high sugar content leading to consider chocolate as “junk food” for its “obesigen” calories. Recently, in association with the renewed interest of nutrition science in alternative source of health-promoting foods and ingredients, a large body of research has been conducted to unravel the pro and cons of cocoa in relation to human health. Epidemiological evidences indicate that cocoa consumption helps preventing cardiovascular disease for its high content in bioactive flavonoids. Clinical trials show that chocolate consumption might improve vascular function, decreasing platelet aggregation and display an antioxidant and anti-inflammatory effect. The putative protective action of cocoa seems to be multi-factorial and involving different aspects of vascular, antioxidant and endothelial function. However, the mechanism(s) that account for the benefits of cocoa it is still unclear. The aim of this Research Topic is therefore to provide the reader with an objective picture of the state of art on the association between cocoa and health, mainly through the evidences of human trials; overwhelmingly considered the golden standard for nutritional science. The Research Topic will cover the analysis of the manufacturing processes of the chocolate and the antioxidant effects in humans as well as the majority of the putative health effects of chocolate and cocoa, such as anti-inflammatory properties, effect on immunity, platelet aggregation, blood pressure, endothelial function and cognitive behavior. Unraveling the functional properties of cocoa will help to understand if the 'food of God' is a primordial gift for the health of mankind.
    Keywords: R5-920 ; RC581-607 ; TX341-641 ; Antioxidants ; Obesity ; Flavonoids ; Humans ; Chocolate ; Blood pressure ; Inflammation ; Cognitive function ; Cocoa ; Immunity
    Language: English
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    The Functional Organization of the Auditory System (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-04-05
    Description: This eBook comprises s series of original research and review articles dealing with the anatomical, genetic, and physiological organization of the auditory system from humans to monkeys and mice.
    Keywords: RC321-571 ; Q1-390 ; audition ; monkeys ; gens ; translational ; Humans ; Rodents ; Memory ; Perception ; Physiology ; functional imaging ; Anatomy ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSA Life sciences: general issues::PSAN Neurosciences
    Language: English
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    3D Recording and Interpretation for Maritime Archaeology (2021)
    Springer Nature
    Details
    Publication Date: 2024-04-07
    Description: This open access peer-reviewed volume was inspired by the UNESCO UNITWIN Network for Underwater Archaeology International Workshop held at Flinders University, Adelaide, Australia in November 2016. Content is based on, but not limited to, the work presented at the workshop which was dedicated to 3D recording and interpretation for maritime archaeology. The volume consists of contributions from leading international experts as well as up-and-coming early career researchers from around the globe. The content of the book includes recording and analysis of maritime archaeology through emerging technologies, including both practical and theoretical contributions. Topics include photogrammetric recording, laser scanning, marine geophysical 3D survey techniques, virtual reality, 3D modelling and reconstruction, data integration and Geographic Information Systems. The principal incentive for this publication is the ongoing rapid shift in the methodologies of maritime archaeology within recent years and a marked increase in the use of 3D and digital approaches. This convergence of digital technologies such as underwater photography and photogrammetry, 3D sonar, 3D virtual reality, and 3D printing has highlighted a pressing need for these new methodologies to be considered together, both in terms of defining the state-of-the-art and for consideration of future directions. As a scholarly publication, the audience for the book includes students and researchers, as well as professionals working in various aspects of archaeology, heritage management, education, museums, and public policy. It will be of special interest to those working in the field of coastal cultural resource management and underwater archaeology but will also be of broader interest to anyone interested in archaeology and to those in other disciplines who are now engaging with 3D recording and visualization.
    Keywords: Geography ; Remote sensing ; Archaeology ; Coasts ; Application software ; Geophysics ; thema EDItEUR::N History and Archaeology::NH History ; thema EDItEUR::N History and Archaeology::NK Archaeology ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVG Geophysics ; thema EDItEUR::R Earth Sciences, Geography, Environment, Planning::RG Geography::RGB Physical geography and topography::RGBP Coastlines ; thema EDItEUR::R Earth Sciences, Geography, Environment, Planning::RG Geography::RGW Geographical information systems, geodata and remote sensing
    Language: English
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    Processing and Analysis of Hyperspectral Data (2021)
    IntechOpen | IntechOpen
    Details
    Publication Date: 2024-04-05
    Description: Hyperspectral imagery has received considerable attention in the last decade as it provides rich spectral information and allows the analysis of objects that are unidentifiable by traditional imaging techniques. It has a wide range of applications, including remote sensing, industry sorting, food analysis, biomedical imaging, etc. However, in contrast to RGB images from which information can be intuitively extracted, hyperspectral data is only useful with proper processing and analysis. This book covers theoretical advances of hyperspectral image processing and applications of hyperspectral processing, including unmixing, classification, super-resolution, and quality estimation with classical and deep learning methods.
    Keywords: Geophysics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVG Geophysics
    Language: English
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    Spatial memory - a unique window into healthy and pathological ageing (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-04-05
    Description: The global population aged over 60 is set to rise dramatically in the coming decades. In many countries, the older population now faces the prospect of spending a quarter of their lives aged over 65, and a significant proportion will have to cope with cognitive decline associated with normal ageing or with dementia disorders. Given that these fundamental demographic changes will pose a significant challenge to health care systems, a detailed understanding of age-related cognitive and neurobiological changes is essential in helping elderly populations maintain cognitive performance. In addition, developing sensitive biomarkers to identify those at risk of developing dementia is crucial for early and effective interventions. To make inferences about the ageing process from the animal model back to the human, rigorous behavioral paradigms must be used to ensure that the same function is being examined across species. Given that similar navigational paradigms can easily be applied to humans and animals, recent years have seen an expansion of studies attempting to bridge the gap between age-related changes in animal and human spatial cognition. These studies begin to suggest that disruptions in spatial computations are among the earliest indicators of impending cognitive decline. In addition, although many animal studies have identified pathological mechanisms with paradigms involving spatial navigation, these mechanisms support many nonspatial cognitive functions as well. As a consequence, a successful characterization of how spatial processing changes in the ageing brain could reveal fundamental effects of cognitive ageing that could inform about general mechanisms underlying decline in perception, mnemonic processing and multisensory integration.
    Keywords: RC321-571 ; Q1-390 ; Neuroscience ; spatial navigation ; Humans ; Aging ; Animal Models ; Dementia ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSA Life sciences: general issues::PSAN Neurosciences
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    Magnetism and Accelerator-Based Light Sources (2021)
    Springer Nature | Springer
    Details
    Publication Date: 2024-04-05
    Description: This open access book collects the contributions of the seventh school on Magnetism and Synchrotron Radiation held in Mittelwihr, France, from 7 to 12 October 2018. It starts with an introduction to the physics of modern X-ray sources followed by a general overview of magnetism. Next, light / matter interaction in the X-ray range is covered with emphasis on different types of angular dependence of X-ray absorption spectroscopy and scattering. In the end, two domains where synchrotron radiation-based techniques led to new insights in condensed matter physics, namely spintronics and superconductivity, are discussed. The book is intended for advanced students and researchers to get acquaintance with the basic knowledge of X-ray light sources and to step into synchrotron-based techniques for magnetic studies in condensed matter physics or chemistry.
    Keywords: Spectroscopy and Microscopy ; Atomic, Molecular, Optical and Plasma Physics ; Optics, Lasers, Photonics, Optical Devices ; Condensed Matter Physics ; Magnetism, Magnetic Materials ; Semiconductors ; X-Ray Spectroscopy ; Synchrotron Techniques ; Laser-Matter Interaction ; Strongly Correlated Systems ; Magnetism ; x-ray light sources ; x-ray scattering ; spintronics ; Open Access ; Gauge invariance in spectroscopy ; molecular magnestism ; magnetic semiconductors ; Spectrum analysis, spectrochemistry, mass spectrometry ; Scientific equipment, experiments & techniques ; Atomic & molecular physics ; Optical physics ; Applied optics ; Materials / States of matter ; Electricity, electromagnetism & magnetism ; Electronic devices & materials ; thema EDItEUR::P Mathematics and Science::PN Chemistry::PNF Analytical chemistry::PNFS Spectrum analysis, spectrochemistry, mass spectrometry ; thema EDItEUR::P Mathematics and Science::PH Physics::PHM Atomic and molecular physics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHJ Optical physics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHD Classical mechanics::PHDF Physics: Fluid mechanics ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TJ Electronics and communications engineering::TJF Electronics engineering::TJFC Electronics: circuits and components
    Language: English
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    Geophysics and Ocean Waves Studies (2021)
    IntechOpen | IntechOpen
    Details
    Publication Date: 2024-04-05
    Description: The book “Geophysics and Ocean Waves Studies” presents the collected chapters in two sections named “Geophysics” and “Ocean Waves Studies”. The first section, “Geophysics”, provides a thorough overview of using different geophysical methods including gravity, self-potential, and EM in exploration. Moreover, it shows the significance of rock physics properties and enhanced oil recovery phases during oil reservoir production. The second section, “Ocean Waves Studies”, is intended to provide the reader with a strong description of the latest developments in the physical and numerical description of wind-generated and long waves, including some new features discovered in the last few years. The section is organized with the aim to introduce the reader from offshore to nearshore phenomena including a description of wave dissipation and large-scale phenomena (i.e., storm surges and landslide-induced tsunamis). This book shall be of great interest to students, scientists, geologists, geophysicists, and the investment community.
    Keywords: Geophysics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVG Geophysics
    Language: English
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    Neuropharmacological, Neurobiological and Behavioral Mechanisms of Learning and Memory (2021)
    Frontiers Media SA
    Details
    Publication Date: 2024-04-04
    Description: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact
    Keywords: drugs ; Behavior ; Memory tasks ; pre-clinical ; clinical ; Humans ; Animals ; thema EDItEUR::P Mathematics and Science::PD Science: general issues ; thema EDItEUR::M Medicine and Nursing::MK Medical specialties, branches of medicine::MKG Pharmacology
    Language: English
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    Radioisotopes (2021)
    IntechOpen | IntechOpen
    Details
    Publication Date: 2024-04-05
    Description: The book Radioisotopes - Applications in Physical Sciences is divided into three sections namely: Radioisotopes and Some Physical Aspects, Radioisotopes in Environment and Radioisotopes in Power System Space Applications. Section I contains nine chapters on radioisotopes and production and their various applications in some physical and chemical processes. In Section II, ten chapters on the applications of radioisotopes in environment have been added. The interesting articles related to soil, water, environmental dosimetry/tracer and composition analyzer etc. are worth reading. Section III has three chapters on the use of radioisotopes in power systems which generate electrical power by converting heat released from the nuclear decay of radioactive isotopes. The system has to be flown in space for space exploration and radioisotopes can be a good alternative for heat-to-electrical energy conversion. The reader will very much benefit from the chapters presented in this section.
    Keywords: Geophysics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVG Geophysics
    Language: English
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    Water and Earthquakes (2021)
    Springer Nature | Springer
    Details
    Publication Date: 2024-04-05
    Description: This open access book explores the interactions between water and earthquakes, including recent concerns about induced seismicity. It further highlights that a better understanding of the response of the water system to disturbances such as earthquakes is needed to safeguard water resources, to shield underground waste repositories, and to mitigate groundwater contamination. Although the effects of earthquakes on streams and groundwater have been reported for thousands of years, this field has only blossomed into an active area of research in the last twenty years after quantitative and continuous documentation of field data became available. This volume gathers the important advances that have been made in the field over the past decade, which to date have been scattered in the form of research articles in various scientific journals.
    Keywords: Geophysics/Geodesy ; Hydrology/Water Resources ; Hydrogeology ; Natural Hazards ; Solid Earth Sciences ; Water ; Earth Sciences ; Groundwater Response ; water-induced seismicity ; Liquefaction ; Mud Volcanoes ; Stream discharge ; Hydrologic Precursors ; Hydrologic changes after earthquakes ; Induced seismicity ; Open Access ; Geophysics ; Hydrology & the hydrosphere ; Natural disasters ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVG Geophysics ; thema EDItEUR::R Earth Sciences, Geography, Environment, Planning::RB Earth sciences::RBK Hydrology and the hydrosphere ; thema EDItEUR::R Earth Sciences, Geography, Environment, Planning::RN The environment::RNR Natural disasters
    Language: English
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    Application of Geographic Information Systems (2021)
    IntechOpen | IntechOpen
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    Publication Date: 2024-04-05
    Description: The importance of Geographic Information Systems (GIS) can hardly be overemphasized in today’s academic and professional arena. More professionals and academics have been using GIS than ever – urban & regional planners, civil engineers, geographers, spatial economists, sociologists, environmental scientists, criminal justice professionals, political scientists, and alike. As such, it is extremely important to understand the theories and applications of GIS in our teaching, professional work, and research. “The Application of Geographic Information Systems” presents research findings that explain GIS’s applications in different subfields of social sciences. With several case studies conducted in different parts of the world, the book blends together the theories of GIS and their practical implementations in different conditions. It deals with GIS’s application in the broad spectrum of geospatial analysis and modeling, water resources analysis, land use analysis, infrastructure network analysis like transportation and water distribution network, and such. The book is expected to be a useful source of knowledge to the users of GIS who envision its applications in their teaching and research. This easy-to-understand book is surely not the end in itself but a little contribution to toward our understanding of the rich and wonderful subject of GIS.
    Keywords: Geophysics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVG Geophysics
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    Magnetic Records of Extreme Geological Events (2021)
    Frontiers Media SA
    Details
    Publication Date: 2022-01-31
    Description: Recent advances in environmental magnetism offer the opportunity to link the magnetic signature of marine and continental rocks to the paleoenvironmental and paleoclimatic settings that controlled their formation or deposition, as well as to post-depositional events, such as diagenesis, that can alter their primary signature. This Research Topic assembles studies that used state of the art rock magnetic techniques to unravel the causes and effects of catastrophic geological events, including tsunami, meteorite impacts, Archean oxygenation event, geomagnetic reversals, and global climate changes linked to large volcanic eruptions.
    Keywords: GB3-5030 ; Q1-390 ; rock magnetism ; Geology ; paleomagnetism ; Geophysics ; extreme events
    Language: English
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    Management of Research Infrastructures: A South African Funding Perspective (2021)
    Springer Nature
    Details
    Publication Date: 2024-04-05
    Description: This open access book provides an overview of the building blocks necessary for managing, steering and guiding the establishment of a research infrastructure (RI). It offers valuable insights into RI investment, access and management at the academic, grants management, agency and policy level, and serves as a useful guide for the research community, students, and those in the private sector wishing to understand the approaches and opportunities involved in the establishment, maintenance and management of research infrastructure platforms. Presenting a holistic view of RI investment and granting cycles from a South African perspective, the book’s target audience includes those working in science diplomacy, policymaking and science grants councils (especially in Africa) as well as funders and donors.
    Keywords: Earth sciences ; Geophysics ; thema EDItEUR::P Mathematics and Science::PH Physics::PHV Applied physics::PHVG Geophysics
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    Kombination geophysikalischer und hydrogeologischer Methoden zur gezielten Erkundung feinkörniger Talfüllungen (2021)
    Springer Berlin Heidelberg
    Details
    Publication Date: 2023-08-09
    Description: Sedimentäre Strukturen können die Fließ- und Stofftransportpfade in feinkörnigen Talfüllungen stark beeinflussen. Diese Strukturen müssen gezielt auf ihre Ausdehnung und Eigenschaften untersucht werden, um Verweilzeiten, Fließpfade und das Abbaupotenzial eingetragener Schadstoffe zu bestimmen. In der quartären Talfüllung der Ammeraue bei Tübingen wurden beispielhaft Torflagen und eine Kiesrinne untersucht, um ihre Einflüsse auf die regionale Hydrogeologie und Hydrochemie zu bewerten. Dafür wurden geophysikalische und hydrogeologische Erkundungsmethoden ausgewählt und kombiniert. Mit geoelektrischen Oberflächenmessungen konnte die Ausdehnung der betrachteten Strukturen erkundet werden. Unterschiedliche Direct-Push-Sondierungen, darunter eine In-situ-Bestimmung der Sedimentfarbe, und bohrlochgeophysikalische Messungen erfassten ihre Geometrie und interne Heterogenität. Die hydraulischen und biogeochemischen Eigenschaften der Sedimente und des Grundwassers wurden anschließend durch gezielte Probennahmen und hydraulische Tests an repräsentativen Ansatzpunkten bestimmt. Die dargestellte Methodenkombination zur Abgrenzung relevanter Teilgebiete mit anschließender hochauflösender Untersuchung lässt sich auch auf die Untersuchung großflächiger Täler übertragen.
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: Eberhard Karls Universität Tübingen (1020)
    Description: Eberhard Karls Universität Tübingen (1020)
    Keywords: ddc:551.49 ; Geophysik ; Standortuntersuchung ; Auengebiet ; Direct-Push ; Sedimentäre Strukturen ; Geophysics ; Site characterization ; Floodplain ; Direct-push ; Sedimentary features
    Language: German
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    Geophysical methods help to assess potential groundwater extraction sites (2021)
    Springer Berlin Heidelberg
    Details
    Publication Date: 2023-06-14
    Description: Complex geology in glacial terrain makes groundwater exploration challenging for water supply companies. Abrupt lateral changes of geological conditions, for example, raise the risk of unsuccessful exploration drilling. At some locations, local water supply companies experience a large number of dry wells, raising the need for better exploration approaches. The use of geophysical techniques enables the detection and characterization of subsurface structures in terms of aquifers and aquitards. We present two examples in which seismic and resistivity methods are combined for subsurface characterization. A thrust structure is detected in the Varde study area in Denmark and a channel structure is mapped in the Hamburg-Sülldorf study area in Germany. The different imaging characteristics of seismic P‑ and S‑waves are demonstrated. The combination of seismic and resistivity methods enables delineating groundwater-bearing and groundwater-barrier layers down to a depth of 150 m.
    Description: Interreg North Sea Region Programme
    Description: Leibniz-Institut für Angewandte Geophysik (3464)
    Keywords: ddc:622.15 ; Seismic reflection ; Electrical resistivity ; P‑waves ; S‑waves ; Geophysics ; Reflexionsseismik ; Widerstandsverfahren ; P‑Wellen ; S‑Wellen ; Geophysik
    Language: English
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    High geothermal heat flow beneath Thwaites Glacier in West Antarctica inferred from aeromagnetic data (2021)
    Nature Publishing Group UK
    Details
    Publication Date: 2024-01-15
    Description: Geothermal heat flow in the polar regions plays a crucial role in understanding ice-sheet dynamics and predictions of sea level rise. Continental-scale indirect estimates often have a low spatial resolution and yield largest discrepancies in West Antarctica. Here we analyse geophysical data to estimate geothermal heat flow in the Amundsen Sea Sector of West Antarctica. With Curie depth analysis based on a new magnetic anomaly grid compilation, we reveal variations in lithospheric thermal gradients. We show that the rapidly retreating Thwaites and Pope glaciers in particular are underlain by areas of largely elevated geothermal heat flow, which relates to the tectonic and magmatic history of the West Antarctic Rift System in this region. Our results imply that the behavior of this vulnerable sector of the West Antarctic Ice Sheet is strongly coupled to the dynamics of the underlying lithosphere.
    Description: The Amundsen Sea sector, Antarctica, is underlain by shallow Curie depths – where the magnetic properties of rocks change – according to airborne magnetic data. This suggests high geothermal heat flow in this region of the West Antarctic Rift System.
    Description: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (Alfred-Wegener- Institute, Helmholtz Centre for Polar and Marine Research) https://doi.org/10.13039/501100003207
    Description: European Space Agency (ESA) https://doi.org/10.13039/501100000844
    Description: Deutsche Forschungsgemeinschaft (German Research Foundation) https://doi.org/10.13039/501100001659
    Description: https://doi.org/10.1594/PANGAEA.932452
    Keywords: ddc:551.1 ; Cryospheric science ; Geomagnetism ; Geophysics ; West Antarctica ; Amundsen Sea sector
    Language: English
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    Journal of Geophysics - Zeitschrift für Geophysik 49 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:49
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält Artikel zu 41 Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1981.
    Description: Inhaltsverzeichnis: Journal of Geophysics 49 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0011.pdf"〉Palaeomagnetism of a Jurassic Ophiolite Series in East Elba (Italy) 〈/a〉〈br〉 (Soffel, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0013.pdf"〉Paleomagnetic Evidence from Mesozoic Carbonate Rocks for the Rotation of Sardinia〈/a〉〈br〉 (Horner, F., Lowrie, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0015.pdf"〉A Geotectonic Paradox: Has the Earth Expanded? 〈/a〉〈br〉 (Schmidt, P. W., Embleton, B. J. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0016.pdf"〉Application of Magnetotelluric and DC Electrical Resistivity Methods in the Neapolitan Geothermal Area〈/a〉〈br〉 (Hunsche, U., Rapolla, A., Musmann, G., Alfano, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0018.pdf"〉Velocity Variations in Systems of Anisotropic Symmetry〈/a〉〈br〉 (Crampin, S., Kirkwood, S. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0019.pdf"〉Shear-Wave Singularities of Wave Propagation in Anisotropic Media〈/a〉〈br〉 (Crampin, S., Yedlin, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0020.pdf"〉Temperature Derivatives of Compressional and Shear Wave Velocities in Crustal and Mantle Rocks at 6 kbar Confining Pressure〈/a〉〈br〉 (Kern, H., Richter, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0021.pdf"〉A Crustal Gravity Model of the Mare Serenitatis - Mare Crisium Area of the Moon〈/a〉〈br〉 (Janle, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0022.pdf"〉On the Origin of the Annual Wave in Hemispheric Geomagnetic Activity〈/a〉〈br〉 (Meyer, J., Damaske, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0023.pdf"〉On the Relation Between Magnetic Field-Aligned Electrostatic Electron Acceleration and the Resulting Auroral Energy Flux〈/a〉〈br〉 (Wilhelm, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0024.pdf"〉Application of Different Methods for the Determination of Ionospheric Conductivities from Sounding Rocket Observations〈/a〉〈br〉 (Brüning, K., Baumjohann, W., Wilhelm, K., Stüdemann, W., Urban, A., Ott, W., Spenner, K., Schmidtke, G. L., Fischer, H. M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0025.pdf"〉Numerical Experiments on Convection in a Chemically Layered Mantle〈/a〉〈br〉 (Christensen, U.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0026.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Raikes, S. A., Engelhard, L., Pape, H., Theile, B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0028.pdf"〉Steady State Creep of Fine Grain Granite at Partial Melting〈/a〉〈br〉 (Auer, F., Berckhemer, H., Oehlschlegel, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0029.pdf"〉Laboratory Synthesis of Aluminium-Substituted Titanomaghemites and Their Characteristic Properties〈/a〉〈br〉 (Özdemir, Ö, O’Reilly, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0030.pdf"〉Densities and Magnetic Susceptibilities of Precambrian Rocks of Different Metamorphic Grade〈/a〉〈br〉 (Southern Indian Shield) (Subrahmanyam, C., Verma, R. K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0031.pdf"〉Lithospheric Structure and Teleseismic 〈i〉P〈/i〉-Wave Reflection Delays Under Fennoscandia and Siberia〈/a〉〈br〉 (Stewart, Ian C. F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0033.pdf"〉Propagation of Surface Waves in Marine Sediments〈/a〉〈br〉 (Essen, H.-H., Janle, H., Schirmer, F., Siebert, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0035.pdf"〉Simultaneous Observation of an Intense 65 keV Field-Aligned Proton Beam and ULF-waves During a Break-up Event〈/a〉〈br〉 (Stüdemann, W., Goertz, C. K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0036.pdf"〉Observations of Field-Aligned Current Sheets Above Discrete Auroral Arcs〈/a〉〈br〉 (Wilhelm, K., Klöcker, N., Theile, B., Ott, W., Spenner, K., Grabowski, R., Wolf, H., Stüdemann, W., Dehmel, G., Fischer, H. M., Schmidtke, G. L., Baumjohann, W., Riedler, W., Urban, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0038.pdf"〉Multi-Method Observations and Modelling of the Three-Dimensional Currents Associated with a Very Strong Ps6 Event〈/a〉〈br〉 (Gustafsson, G., Baumjohann, W., Iversen, I.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0040.pdf"〉Variability of Solar EUV Fluxes and Exospheric Temperatures〈/a〉〈br〉 (Schmidtke, G., Börsken, N., Sünder, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0041.pdf"〉Paleomagnetism of Quaternary and Miocene Lavas from North-East and Central Morocco〈/a〉〈br〉 (Najid, D., Westphal, M., Hernandez, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0042.pdf"〉In Memoriam Wilhelm Hiller〈/a〉〈br〉 (Schneider, Götz)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0043.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Wilhelm, H., Neubauer, F. M., Schopper, J. R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0044.pdf"〉Joint Two-Dimensional Observations of Ground Magnetic and Ionospheric Electric Fields Associated with Auroral Zone Currents〈/a〉〈br〉 (Inhester, B., Baumjohann, W., Greenwald, R. A., Nielsen, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0045.pdf"〉Current Flow in Auroral Forms Responsible for Ps 6 Magnetic Disturbances〈/a〉〈br〉 (Rostoker, G., Apps, K. S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0046.pdf"〉Correlation of Geomagnetic Activity Indices ap with the Solar Wind Speed and the Southward Interplanetary Magnetic Field〈/a〉〈br〉 (Schreiber, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0047.pdf"〉High Time-Resolution Correlation Between the Magnetic Field Behaviour at 37 〈i〉R〈/i〉〈sub〉E〈/sub〉 Distance in the Magnetotail Plasma Sheet and Ground Phenomena During Substrom Expansive Phase〈/a〉〈br〉 (Sergeev, V. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0048.pdf"〉Simultaneous Observations of Energetic Protons Close to the Bow Shock and Far Upstream〈/a〉〈br〉 (Scholer, M., Ipavich, F. M., Gloeckler, G., Hovestadt, D.)〈/a〉〈/li〉 〈li〉〈a href=" https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0049.pdf"〉Non-Adiabatic Expansion of Low-Temperature Solar Wind Radial Temperature Gradients〈/a〉〈br〉 (Geranios, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0050.pdf"〉Correlation Between Seismic Microactivity, Temperature and Subsidence of Water Level at Reservoirs〈/a〉〈br〉 (Merkler, G., Bock, G., Fuchs, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0052.pdf"〉〈sup〉40〈/sup〉Ar/〈sup〉39〈/sup〉Ar Dating of Himalayan Rocks from the Mount Everest Region〈/a〉〈br〉 (Kaneoka, Ichiro, Kono, Masaru)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0053.pdf"〉A Comparison of the Thermal and Mechanical Structure of the Lithosphere Beneath the Bohemian Massif and the Pannonian Basin〈/a〉〈br〉 (Onuoha, K. M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0054.pdf"〉Extremal Models for Electromagnetic Induction in Two-Dimensional Perfect Conductors〈/a〉〈br〉 (Weidelt, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0055.pdf"〉On a Type Classification of Lower Crustal Layers Under Precambrian Regions〈/a〉〈br〉 (Jones, A. G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0056.pdf"〉Spherical-Earth Gravity and Magnetic Anomaly Modeling by Gauss-Legendre Quadrature Integration〈/a〉〈br〉 (Frese, R. R. B., Hinze, W. J., Braile, L. W., Luca, A. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0057.pdf"〉Detection Probabilities for Earthquakes in Sweden〈/a〉〈br〉 (Shapira, A., Kulhánek, O., Wahlström, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0058.pdf"〉The Geocyclotron Revisited: Potentialities of Modulated Wave Injection〈/a〉〈br〉 (Brinca, A. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0059.pdf"〉Eine kleine Historie zur Namengebung der Fachdisziplin Geophysik〈/a〉〈br〉 (Buntebarth, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0060.pdf"〉〈i〉Correction〈/i〉: High Precision Measurement of the Frequency of Mode 〈sub〉0〈/sub〉S〈sub〉0〈/sub〉〈/a〉〈br〉 (Zürn, W., Knopoff, L., Rydelek, P. A.)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Aeronomy ; Aurora ; Canada ; Electromagnetism ; Geomagnetism ; Geomagnetismus ; Geophysics ; Geophysik ; Himalaya ; India ; Ionosphere ; Ionosphäre ; Italy ; Lithosphere ; Lithosphäre ; Magnetotellurics ; Magnetotellurik ; Moon ; Morocco ; Palaeomagnetism ; Paläomagnetismus ; Rock Magnetism ; Seismology ; Seismologie ; Siberia ; Waves ; Wellen ; FID-GEO-DE-7
    Language: German , English
    Type: anthology_digi
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    CITATION GEO-LEO
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    Journal of Geophysics - Zeitschrift für Geophysik 43 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:43
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 78 Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1977.
    Description: Inhaltsverzeichnis: Journal of Geophysics 43 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0012.pdf"〉Editors' Preface〈/a〉〈br〉 (Fuchs, K., Müller, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0013.pdf"〉Full Wave Theory Applied to a Discontinuous Velocity Increase: The Inner Core Boundary〈/a〉〈br〉 (Cormier, V. F., Richards, P. G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0016.pdf"〉Propagation of Elastic Waves in Vertically Inhomogeneous Media〈/a〉〈br〉 (Ungar, A., Ilan, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0017.pdf"〉Finite-Difference Modelling for P-Pulse Propagation in Elastic Media with Arbitrary Polygonal Surface〈/a〉〈br〉 (Ilan, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0020.pdf"〉Extension of Matrix Methods to Structures with Slightly Irregular Stratification〈/a〉〈br〉 (Cisternas, A., Jobert, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0021.pdf"〉Modal Approach to Wave Propagation in Layered Media with Lateral Inhomogeneities〈/a〉〈br〉 (Saastamoinen, P. R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0022.pdf"〉On the Propagation of Seismic Pulses in a Porous Elastic Solid〈/a〉〈br〉 (Mainardi, F., Servizi, G., Turchetti, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0023.pdf"〉Three-Dimensional Seismic Ray Tracing〈/a〉〈br〉 (Julian, B. R., Gubbins, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0025.pdf"〉On Geophysical Inverse Problems and Constraints〈/a〉〈br〉 (Sabatier, P. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0027.pdf"〉On Impulse Response Data and the Uniqueness of the Inverse Problem〈/a〉〈br〉 (Barcilon, V.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0028.pdf"〉Least-Squares Collocation and the Gravitational Inverse Problem〈/a〉〈br〉 (Moritz, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0029.pdf"〉The Statistical Description and Interpretation of Geophysical Potential Fields Using Covariance Functions〈/a〉〈br〉 (Kautzleben, H., Harnisch, M., Schwahn, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0030.pdf"〉A Finite Element Program Package for Electromagnetic Modeling〈/a〉〈br〉 (Kaikkonen, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0032.pdf"〉Linear Inverse Problem in Gravity Profile Interpretation〈/a〉〈br〉 (Vigneresse, J. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0034.pdf"〉Data Seizing and Information Processing〈/a〉〈br〉 (Picard, C. F., Sallantin, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0035.pdf"〉Formal Morphostructural Zoning of Mountain Territories〈/a〉〈br〉 (Alekseevskaya, M., Gabrielov, A., Gel’fand, I., Gvishiani, A., Rantsman, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0036.pdf"〉Three Dimensional Seismic Velocity Anomalies in the Lithosphere〈/a〉〈br〉 (Aki, Keiiti)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0038.pdf"〉The Inversion of Long Range Seismic Profiles〈/a〉〈br〉 (Kennett, B. L. N.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0040.pdf"〉An Oceanic Long Range Explosion Experiment〈/a〉〈br〉 (Orcutt, J. A., Dorman, L. M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0041.pdf"〉The Upper Mantle Under Western Europe Inferred from the Dispersion of Rayleigh Modes〈/a〉〈br〉 (Nolet, Guust)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0044.pdf"〉Global and Regional Phase Velocities of Long-Period Fundamental Mode Rayleigh Waves〈/a〉〈br〉 (Mitronovas, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0045.pdf"〉The Inversion of Surface Wave Dispersion Data with Random Errors〈/a〉〈br〉 (Knopoff, L., Chang, F.-S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0048.pdf"〉Finite Difference Calculation of Stress Relaxation Earthquake Models〈/a〉〈br〉 (Stöckl, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0050.pdf"〉On Equivalent Models of Seismic Sources〈/a〉〈br〉 (Jobert, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0051.pdf"〉A Method for Synthesis of the Seismic Coda of Local Earthquakes〈/a〉〈br〉 (Herrmann, R. B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0055.pdf"〉Application of Two-Timing Methods in Statistical Geophysics〈/a〉〈br〉 (Hasselmann, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0056.pdf"〉Scattered Waves in the Coda of P〈/a〉〈br〉 (Hudson, J. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0057.pdf"〉Elastic Wave Propagation in a Highly Scattering Medium – A Diffusion Approach〈/a〉〈br〉 (Dainty, A. M., Toksöz, M. N.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0058.pdf"〉Seismic Energy Transmission in an Intensively Scattering Environment〈/a〉〈br〉 (Nakamura, Yosio)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0060.pdf"〉Scattering of Rayleigh Waves by a Ridge〈/a〉〈br〉 (Sabina, F. J., Willis, J. R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0061.pdf"〉Mean-Field Electrodynamics and Dynamo Theory of the Earth's Magnetic Field〈/a〉〈br〉 (Krause, F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0064.pdf"〉An Example of Nonlinear Dynamo Action〈/a〉〈br〉 (Busse, F. H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0065.pdf"〉Energetics of the Earth's Core〈/a〉〈br〉 (Gubbins, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0066.pdf"〉Equation of State of Liquid Iron at the Earth's Core Conditions〈/a〉〈br〉 (Boschi, E., Mulargia, F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0067.pdf"〉Lithospheric Slab Penetration into the Lower Mantle beneath the Sea of Okhotsk〈/a〉〈br〉 (Jordan, T. H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0069.pdf"〉〈i〉Abstracts and Short Communications〈/i〉〈/a〉〈br〉〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0068.pdf"〉Phenomenological Representation of Seismic Sources〈/a〉〈br〉 (Backus, G., Mulcahy, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0070.pdf"〉The Influence of the Core and the Oceans on the Chandler Wobble〈/a〉〈br〉 (Dahlen, F. A., Smith, M. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0071.pdf"〉The Earth's Core-Mantle Interface Revisited〈/a〉〈br〉 (Hide, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0072.pdf"〉Seismic Observations of Structure and Physical Properties of the Subcrustal Lithosphere as Evidence for Dynamical Processes in the Upper Mantle〈/a〉〈br〉 (Fuchs, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0073.pdf"〉Seismic Anisotropy – a Summary〈/a〉〈br〉 (Crampin, Stuart)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0074.pdf"〉Precise Continuous Monitoring of Seismic Velocity Variations〈/a〉〈br〉 (Bungum, H., Risbo, T., Hjortenberg, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0075.pdf"〉On the Computation of Theoretical Seismograms for Multimode Surface Waves〈/a〉〈br〉 (Calcagnile, G., Panza, G. F., Schwab, F., Kausel, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0076.pdf"〉On the Excitation of the Earth's Seismic Normal Modes〈/a〉〈br〉 (Vlaar, N. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0077.pdf"〉Seismic Velocities and Density of an Attenuating Earth〈/a〉〈br〉 (Hart, R. S., Anderson, D. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0078.pdf"〉A First-Motion Alternative to Geometrical Ray Theory〈/a〉〈br〉 (Chapman, C. H., Dey Sarkar, S. K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0079.pdf"〉Heterogeneous Velocity Structure at the Base of the Mantle〈/a〉〈br〉 (Snoke, J. A., Sacks, I. S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0080.pdf"〉Heterogeneous velocity structure at the base of the mantle〈/a〉〈br〉 (Sacks, I. S., Snoke, J. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0081.pdf"〉Theoretical Seismograms of Core Phases Calculated by a Frequency-Dependent Full Wave Theory, and Their Interpretation〈/a〉〈br〉 (Choy, G. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0082.pdf"〉Amplitudes of Long-Period PcP, SKS and SKKS and the Structure at the Base of the Mantle and in the Outer Core〈/a〉〈br〉 (Müller, G., Kind, R., Mula, A., Gregersen, S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0083.pdf"〉Relative Errors in Group Velocity Measurements〈/a〉〈br〉 (Knopoff, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0084.pdf"〉The Propagation of Plasma Waves in the Jovian Magnetosphere〈/a〉〈br〉 (Denskat, K. U., Neubauer, F. M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0085.pdf"〉Statistical Theory of Electromagnetic Induction in Thin Sheets〈/a〉〈br〉 (Treumann, R., Schäfer, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0086.pdf"〉Precursors to P' P' and Upper Mantle Discontinuities〈/a〉〈br〉 (Husebye, E. S., Haddon, R. A. W., King, D. W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0090.pdf"〉Mantle Heterogeneity and Mislocation Patterns for Seismic Networks〈/a〉〈br〉 (Vermeulen, J. M., Doornbos, D. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0093.pdf"〉Correlation Between Micro-Activity and Variation of Water Level at the Schlegeis-Reservoir〈/a〉〈br〉 (Blum, R., Bock, G., Fuchs, K., Merkler, G., Widmann, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0095.pdf"〉Attenuation Coefficients of Acoustic Normal Modes in Shallow Water〈/a〉〈br〉 (Essen, H.-H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0096.pdf"〉Relation of Gravity to Elevation in Zambia〈/a〉〈br〉 (Töpfer, K. D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0098.pdf"〉Albert Defant (1884 - 1974) 〈/a〉〈br〉 (Krauß, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0099.pdf"〉Study of the Structure of the Lower Lithosphere by Explosion Seismology in the USSR〈/a〉〈br〉 (Ryaboy, V. Z.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0102.pdf"〉P-Wave Amplitudes and Sources of Scattering in 〈i〉m〈/i〉〈sub〉b〈/sub〉-Observations〈/a〉〈br〉 (Ringdal, F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0104.pdf"〉Analyse von Mikroseismikmessungen auf Sylt〈/a〉〈br〉 (Szelwis, R., Janle, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0107.pdf"〉Improved Technique for Rapid Interpretation of Gravity Anomalies Caused by Two-Dimensional Sedimentary Basins〈/a〉〈br〉 (Töpfer, K. D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0109.pdf"〉Investigation of Isostasy by Computing the Correlation Coefficients between Elevations and Bouguer Anomalies〈/a〉〈br〉 (Janle, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0110.pdf"〉Geoelectrical Deep Soundings in Southern Africa Using the Cabora Bassa Power Line〈/a〉〈br〉 (Blohm, E. K., Worzyk, P., Scriba, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0112.pdf"〉Spectral Characteristics of Cross-Field and Two Stream Instability as Revealed by Rocket Borne Studies〈/a〉〈br〉 (Gupta, S. P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0113.pdf"〉〈i〉Short Communication〈/i〉 Observation of PS Reflections from the Moho〈/a〉〈br〉 (Jacob, A. W. B., Booth, D. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0115.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Makris, J., Weigel, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0116.pdf"〉Planetarische Dynamos〈/a〉〈br〉 (Stix, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0117.pdf"〉〈i〉Original Investigations〈/i〉 A Note on the Post-Rosenbluth Quasilinear Diffusion Coefficient in the Ring Current Region〈/a〉〈br〉 (Treumann, R., Grafe, A., Lehmann, H.-R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0118.pdf"〉Remote Sensing Experiment for Magnetospheric Electric Fields Parallel to the Magnetic Field〈/a〉〈br〉 (Wilhelm, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0119.pdf"〉A Study of the Echzell/Wetterau Earthquake of November 4, 1975〈/a〉〈br〉 (Neugebauer, H. J., Tobias, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0121.pdf"〉Thermoelastic Deformations of a Half-Space – A Green's Function Approach〈/a〉〈br〉 (Müller, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0123.pdf"〉Gravity Variations with Time in Northern Iceland 1965–1975〈/a〉〈br〉 (Torge, W., Drewes, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0125.pdf"〉High Resolution Near Surface Reflection Measurements Using a Vertical Array Technique〈/a〉〈br〉 (Schepers, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0127.pdf"〉Ausbreitung von Rayleigh-Kanalwellen in Steinkohleflözen – Modellseismische Untersuchungen〈/a〉〈br〉 (Freystätter, S., Dresen, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0129.pdf"〉Comment on: Hydromagnetic Waves in a Non-Uniform Plasma〈/a〉〈br〉 (Kupfer, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0130.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Kisslinger, C., Klußmann, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0131.pdf"〉〈i〉Erratum〈/i〉 Full Wave Theory Applied to a Discontinuous Velocity Increase: The Inner Core Boundary〈/a〉〈br〉 (Cormier, V. F., Richards, P. G.)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: Dynamo Theory
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Africa ; Dynamo Theory ; Earthquakes ; Earth's Core ; Engineering Seismics ; Seismology ; Seismologie ; Geomagnetism ; Gravity ; Iceland ; Lithosphere ; Lithosphäre ; Magnetosphere ; Plasma Waves ; Seismic Waves ; Waves ; Wellen ; Geophysik ; Geophysics ; FID-GEO-DE-7
    Language: German , English
    Type: anthology_digi
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  • 32
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    Time and space scattered volcanism of Mt. Etna driven by strike-slip tectonics (2019)
    Details
    Publication Date: 2019-12-05
    Description: High-resolution seismic reflection, magnetic and gravity data, acquired offshore of Etna volcano, provide a new insight to understanding the relationship between tectonics and spatial-temporal evolution of volcanism. The Timpe Plateau, a structural high pertaining to the Hyblean foreland domain, located offshore of southeastern Mt. Etna, is speckled by volcanics and strongly affected by strike-slip tectonics. Transpressive deformation produced a push-up and a remarkable shortening along WNW-ESE to NW-SE trending lineaments. Fault segments, bounding basinal areas, show evidence of positive tectonic inversion, suggesting a former transtensive phase. Transtensive tectonics favoured the emplacement of deep magmatic intrusive bodies and Plio-Quaternary scattered volcanics through releasing zones. The continuing of wrench tectonics along different shear zones led to the migration of transtensive regions in the Etna area and the positive inversion of the former ones, where new magma ascent was hampered. This process caused the shifting of volcanism firstly along the main WNW-ESE trending "Southern Etna Shear Zone", then towards the Valle del Bove and finally up to the present-day stratovolcano.
    Description: Published
    Description: 12125
    Description: 1T. Struttura della Terra
    Description: 1V. Storia eruttiva
    Description: 2V. Struttura e sistema di alimentazione dei vulcani
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: 3A. Geofisica marina e osservazioni multiparametriche a fondo mare
    Description: 2TR. Ricostruzione e modellazione della struttura crostale
    Description: JCR Journal
    Keywords: Geodynamics ; Geophysics ; 04.06. Seismology ; Tectonics ; 04.08. Volcanology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 33
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    Global Cloud-Resolving Models (2019)
    In:  CASI
    Details
    Publication Date: 2019-05-25
    Description: Global cloud-resolving models (GCRMs) are a new category of atmospheric global models designed to solve different flavors of the nonhydrostatic equations through the use of kilometer-scale global meshes. GCRMs make it possible to explicitly simulate deep convection, thereby avoiding the need for cumulus parameterization and allowing for clouds to be resolved by microphysical models responding to grid-scale forcing. GCRMs require high-resolution discretization over the globe, for which a variety of mesh structures have been proposed and employed. The first GCRM was constructed 15 years ago, and in recent years, other groups have also begun adopting this approach, enabling the first intercomparison studies of such models. Because conventional general circulation models (GCMs) suffer from large biases associated with cumulus parameterization, GCRMs are attractive tools for researchers studying global weather and climate. In this review, GCRMs are described, with some emphasis on their historical development and the associated literature documenting their use. The advantages of GCRMs are presented, and currently existing GCRMs are listed and described. Future prospects for GCRMs are also presented in the final section.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN69066 , Current Climate Change Reports (e-ISSN 2198-6061)
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    NASA TECHNICAL REPORTS
  • 34
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    Quantifying the Influence of Redox Conditions on the Seismic Properties of Olivine (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: A series of eight olivine specimens were fabricated by hot-pressing at 1200 degrees Celsius and 300 megapascals (MPa). Each hot-pressed specimen was then wrapped in Pt, Ni or NiFe foil to vary oxygen fugacity (fO2), and interrogated via forced torsional oscillation. Mechanical testing was conducted at 10 oscillation periods between 1 and 1000 seconds, at a confining pressure of 200 MPa, during a slow staged-cooling from a maximum temperature of 1200 degrees Celsius to room temperature. After mechanical testing, each specimen was axially sectioned and EBSD (Electron BackScatter Diffraction) was used for the determination of the representative grain size, and grain size distribution of each sample. In addition, each longitudinal section was mapped via FTIR (Fourier Transform InfraRed spectroscopy) to determine the spatial distribution and concentrations of chemically bound and molecular water. Amongst these specimens, chemically bound water contents were observed to vary between 0 and 1150 atom ppm (parts per million) H/Si, and molecular water concentrations varied between 0 and 245 atom ppm H/Si. Our forced-oscillation results demonstrate that the measured magnitude of anelastic relaxation within the experimental window of oscillation periods is unrelated to the water content. Rather, a relationship was observed between the magnitude of anelastic relaxation and the prevailing redox conditions, which is influenced by the choice of metal sleeving used during the mechanical test. Further, regardless of water content or metal sleeving, each specimen exhibits coupled variations in shear modulus and dissipation within the observational window, indicative of high-temperature background behavior, that can be described by a Burgers-type model. During initial fitting of the Burgers models, the unrelaxed shear modulus at a reference temperature of 900 degrees Celsius (G (sub UR)) and the temperature derivative of the unrelaxed shear modulus (dG (sub U)/dT), were treated as adjustable parameters. For all Fe-bearing olivine samples (but not a hydrous and oxidized Fe-free sample) we observe deficits of G (sub UR), and increased values of dG (sub U)/dT, relative to the expected elastic (anharmonic) behavior of Fo90 olivine. This behavior is indicative of anelastic relaxation occurring at shorter periods than observable within the window of oscillation periods used in the mechanical test. Moving towards a comprehensive seismologically applicable Burgers model, which includes this newly observed effect of redox conditions on anelastic relaxation, we will present our progress in reconciling truly anharmonic and elastic behavior of Fo (sub 90) olivine with our observed forced-oscillation data.
    Keywords: Geophysics
    Type: EGU 2019-3539 , JSC-E-DAA-TN66268 , Geophysical Research Abstracts (GRA) (ISSN 0094-8276) (e-ISSN 1944-8007); 21|European Geosciences Union General Assembly (EGU 2019); 7ý12 Apr. 2019; Vienna; Austria
    Format: application/pdf
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  • 35
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    Titanium-in-Quartz Geothermometry of Impactites and Peak-Ring Lithologies from the Chicxulub Impact Crater (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Since its development by Wark and Watson (2006), the Ti-in-quartz geothermometer (TitaniQ) has been continuously refined and applied to a variety of lithologies from different crustal settings. Assuming quartz crystallized and incorporated Ti under equilibrium conditions and providing TiO2 activity (alpha (sub TiO2)) is reasonably constrained, crystallization temperatures at typical crustal pressures can be calculated. In turn, when crystallization temperatures are independently constrained, Ti-in-quartz can be used as a geobarometer. Here we explore the application of this technique to impact lithologies. Quartz is ubiquitous in terrestrial impact structures in upper crustal settings and can also form as a post-impact hydrothermal mineral. Together with other geothermometers, such as Ti-in-zircon, Ti-in-quartz can potentially help constrain the temperature-pressure conditions during the formation of the pre-impact target rock at terrestrial impact structures, as well as impact-produced and hydrothermally-altered lithologies. This work presents the first systematic Ti-in-quartz study of impactites and granitoid target rocks from the approximately180-kilometer-diameter, end-Cretaceous Chicxulub crater on the Yucatan Peninsula, Mexico, thereby placing new constraints on the emplacement of felsic plutons within the Maya Block in the Paleozoic, impact melt crystallization at approximately 66 Ma (million years ago), and post-impact hydrothermal overprint inside the Chicxulub crater.
    Keywords: Geophysics
    Type: LPI Contrib. No. 2132 , JSC-E-DAA-TN65671 , Lunar and Planetary Science Conference (LPSC 2019); 18ý22 Mar. 2019; The Woodlands, TX; United States
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    Possible Role for Tectonics in the Evolving Stability of the Greenland Ice Sheet (2019)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The history of the Greenland Ice Sheet has been influenced by the geodynamic response to ice sheet fluctuations, and this interaction may help explain past deglaciations under modest climate forcing. We hypothesize that when the Iceland hot spot passed beneath northcentral Greenland, it thinned the lithosphere and left anomalous heat likely with partially melted rock; however, it did not break through the crust to supply voluminous flood basalts. Subsequent PlioPleistocene glacialinterglacial cycles caused large and rapidly migrating stresses, driving dike formation and other processes that shifted melted rock toward the surface. The resulting increase in surface geothermal flux favored a thinner, fasterresponding ice sheet that was more prone to deglaciation. If this hypothesis of control through changes in geothermal flux is correct, then the longterm (10 (sup 5) to 10 (sup 6) years) trend now is toward lower geothermal flux, but with higherfrequency (less than or equal to 10( sup 4) to 10 (sup 5) years) oscillations linked to glacialinterglacial cycles. Whether the geothermal flux is increasing or decreasing now is not known but is of societal relevance due to its possible impact on ice flow. We infer that projections of the future of the ice sheet and its effect on sea level must integrate geologic and geophysical data as well as glaciological, atmospheric, oceanic, and paleoclimatic information.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN65582 , Journal of Geophysical Research Earth Surface (ISSN 2169-9003) (e-ISSN 2169-9011); 124; 1; 97-115
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    Evaluation of Various Methods for Determining Bulk Compositions of Chondrules and Other Objects in Petrographic Thin Sections (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: Studies of many objects in petrographic thin section, such as melt inclusions in igneous rocks, chondrules and Ca-Al rich inclusions in chondritic meteorites, or clasts in lunar and other breccias, require or can benefit from knowledge of their bulk compositions. Given the scarcity of these materials, the reluctance of curators to provide more abundant material, and the extreme difficulty of cleanly separating such objects from their rock matrices, geochemical and cosmochemical studies need the ability to determine their bulk compositions from in situ methods, such as defocused beam analysis, or quantitative chemical mapping by electron beam methods.
    Keywords: Geophysics
    Type: JSC-E-DAA-TN69198 , Microscopy & Microanalysis Meeting (M&M 2019); Aug 04, 2019 - Aug 08, 2019; Portland, OR; United States
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    Genetic Relationship Between Martian Chassignites and Nakhlites Revealed from Noble Gases (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: A group called as Martian meteorites is composed of shergottites, nakhlites, chassignites, and orthopyroxenite, and they are thought to be derived from Mars. Among the Martian meteorites nakhlites and chassignites show similar cosmic-ray exposure (CRE) ages of 11-12 million years, although petrologic characteristics are very different between them. Both nakhlites and chassignites indicate similar cooling rates, and would have cooled in identical scale of igneous bodies. However, the relationship between nakhlites and chassignites is still unclear, although they might have ejected at the same time, i.e., by accidentally coincidental impact events which occurred at different places on Mars or by a single impact which excavated both nakhlites and chassignites residing in a relatively small area. Here we propose that the chassignites show a genetically close relationship with nakhlites, i.e., both groups could be located within a relatively narrow area from where a single impact could have launched those meteorites, based on noble gas data obtained in our laboratory. If chassignites were really ejected with nakhlites by a single impact, both types of meteorites will provide us with geological/petrological profile in the area where both pyroxene-rich lava (nakhlites) and dunite-rich rocks (chassignites) are located close to the Martian surface. [i.e. discusses NWA 2737, etc. (Martian meteorites that fell in Northwest Africa)]
    Keywords: Geophysics
    Type: JSC-E-DAA-TN68238 , Annual Meeting of the Meteoritical Society (MetSoc 2019); Jul 07, 2019 - Jul 12, 2019; Sapporo, Hokkaido; Japan
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    The Influence of Redox Conditions on the Seismic Properties of Polycrystalline Olivine (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: Eight olivine specimens were fabricated by use of a solgel method and hot-pressing at 1200 degrees Centigrade and 300 megapascals (MPa) inside of welded Pt capsules. Each hot-pressed specimen was then recovered, precision ground, and wrapped in Pt, Ni or NiFe foil to vary oxygen fugacity (fO2) during the subsequent forced torsional oscillation measurements. Mechanical testing was conducted at 10 oscillation periods between 1 and 1000 seconds, at a confining pressure of 200 MPa, during a slow staged-cooling from a maximum temperature of 1200 degrees Centigrade down to room temperature. After mechanical testing, each specimen was axially sectioned and EBSD (Electron BackScatter Diffraction) was used for the determination of the representative grain size, and grain size distribution of each sample. In addition, each longitudinal section was mapped via FTIR (Fourier Transform Infrared Spectroscopy) to determine the spatial distribution and concentrations of chemically bound and molecular water. Amongst these eight specimens, chemically bound water contents were observed to vary between 0 and 1150 atom parts per million (ppm) H/Si, and molecular water concentrations varied between 0 and 245 atom ppm H/Si. Our forced-oscillation results demonstrate that the measured magnitude of anelastic relaxation within the experimental window of oscillation periods is unrelated to the water content. Rather, a relationship was observed between the magnitude of anelastic relaxation and the prevailing redox conditions, which is influenced by the choice of metal sleeving used during the mechanical test. Further, regardless of water content or metal sleeving, each specimen exhibits coupled variations in shear modulus and dissipation within the observational window, indicative of high-temperature background behavior, that can be described by a Burgers-type model. During initial fitting of the Burgers models, the unrelaxed shear modulus at a reference temperature of 900C (elastic unloading/reloading shear modulus G (sub UR)) and the temperature derivative of the unrelaxed shear modulus (dGU/dT), were treated as adjustable parameters. For all Fe-bearing olivine samples we observe deficits of G (sub UR) and increased values of dGU/dT, relative to the expected elastic (anharmonic) behavior for Fo (Forsterite content percentage) (sub 90) olivine. This behavior is indicative of anelastic relaxation occurring at shorter periods than observable within the window of oscillation periods used in the mechanical test. Moving towards a comprehensive and seismologically applicable Burgers model, which includes this newly observed effect of redox conditions on anelastic relaxation, we will present our progress on reconciling truly anharmonic and elastic behavior of Fo (sub 90) olivine with our observed forced-oscillation data.
    Keywords: Geophysics
    Type: JSC-E-DAA-TN70052 , Consortium for Materials Properties Research in Earth Sciences Annual Meeting (COMPRES 2019); Aug 02, 2019 - Aug 05, 2019; Big Sky, MT
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    Reassessment of Electromagnetic Core-Mantle Coupling and Its Implications to the Earth's Decadal Polar Motion (2019)
    In:  Other Sources
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    Publication Date: 2019-08-29
    Description: The observed Earth's polar motion on decadal time scales has long been conjectured to be excited by the exchange of equatorial angular momentum between the solid mantle and the fluid outer core, via the mechanism of electromagnetic (EM) core-mantle coupling. However, past estimations of the EM coupling torque from surface geomagnetic observations is too weak to account for the observed decadal polar motion. Our recent estimations from numerical geodynamo simulations have shown the opposite. In this paper, we re-examine in detail the EM coupling mechanism and the properties of the magnetic field in the electrically conducting lower mantle (characterized by a thin D-layer at the base of the mantle). Our simulations find that the toroidal field in the D-layer from the induction and convection of the toroidal field in the outer core could be potentially much stronger than that from the advection of the poloidal field in the outer core. The former, however, cannot be inferred from geomagnetic observations at the Earth's surface, and is missing in previous EM torque estimated from geomagnetic observations. Our deduction suggests further that this field could make the actual EM coupling torque sufficiently strong, at approximately 5 10(exp 19) Nm, to excite, and hence explain, the decadal polar motion to magnitude of approximately 10 mas.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN72348 , Geodesy and Geodynamics (e-ISSN 1674-9847); 10; 5; 356-362
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    Oxidation of the Mantle Wedge by H+ in Aqueous Fluids: A New Interdisciplinary Approach (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The observation that arc magmas are the most oxidized on Earth have led petrologists to question whether the subduction process might cause oxidation of the sub-arc mantle source. A strong correlation between the input of slab-derived aqueous fluid and Fe3(+)/Fe in arc magmas has led to the hypothesis that slab fluids may facilitiate the transfer of redox potential from oxidized slab material to mantle wedge and subsequently to primary arc melts. Despite this intuitive link, identifying an efficient and ubiquitous chemical process to transfer oxidation state in slab fluids has been challenging. Pure H2O alone is an inefficient oxidizer in the mantle, necessitating another oxidant within the fluid. Commonly invoked components include S or C, which are likely heterogeneously distributed within subducting slabs, and direct transfer of Fe3(+), which is only possible in very solute-rich fluids. Here we present a new mechanism to explain the oxidation of the sub-arc mantle by slab-derived aqueous fluid, wherein dissolved H(+)(aq) is reduced to H2(aq). Redox equilibrium is satisfied by electron transfer from Fe2(+)(s), which is oxidized in the rock to Fe3(+)(s) in the reaction: 2Fe2(+)(s) + 2H(+)(aq) = 2Fe3(+)(s) + H2(aq). This simple reaction was previously overlooked due to the assumption that all H must be bound by H2O molecules (i.e., no dissolved H), applicable to a pure H2O fluid, but not one with a solute load as addressed here. The application of thermodynamic modeling tools from aqueous geochemistry (DEW, EQ3/6) to mantle petrology predicts this reaction between mantle rock and slab fluid with our own experimentally constrained chemistry and fO2 (QFM+2). Mass transfer model results show an increase in Fe3(+)/Fe in mantle rock from MORB- like (0.15) to arc-like (0.20.3) values at reasonable fluid fluxes, co-incident with increasing H2 activity in the fluid. This can explain the stark correlation between slab fluid input into the mantle wedge and the observed fO2 of arc magmas. Moreover, it does not require diffusion of hydrogen out of the system. Instead, H2 remains dissolved in fluid in equilibrium with oxidized mantle rock.
    Keywords: Geophysics
    Type: JSC-E-DAA-TN67364 , GOLDSCHMIDT; Aug 18, 2019 - Aug 23, 2019; Barcelona; Spain
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    LandAtmosphere Feedbacks Exacerbate Concurrent Soil Drought and Atmospheric Aridity (2019)
    In:  Other Sources
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    Publication Date: 2019-09-21
    Description: Compound extremes such as cooccurring soil drought (low soil moisture) and atmospheric aridity (high vapor pressure deficit) can be disastrous for natural and societal systems. Soil drought and atmospheric aridity are 2 main physiological stressors driving widespread vegetation mortality and reduced terrestrial carbon uptake. Here, we empirically demonstrate that strong negative coupling between soil moisture and vapor pressure deficit occurs globally, indicating high probability of cooccurring soil drought and atmospheric aridity. Using the Global Land Atmosphere Coupling Experiment (GLACE)-CMIP5 experiment, we further show that concurrent soil drought and atmospheric aridity are greatly exacerbated by land atmosphere feedbacks. The feedback of soil drought on the atmosphere is largely responsible for enabling atmospheric aridity extremes. In addition, the soil moistureprecipitation feedback acts to amplify precipitation and soil moisture deficits in most regions. CMIP5 models further show that the frequency of concurrent soil drought and atmospheric aridity enhanced by landatmosphere feedbacks is projected to increase in the 21st century. Importantly, land atmosphere feedbacks will greatly increase the intensity of both soil drought and atmospheric aridity beyond that expected from changes in mean climate alone.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN72966 , Proceedings of the National Academy of Sciences (ISSN 0027-8424) (e-ISSN 1091-6490); 116; 38; 18,848-18,853
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    Joint 3D-Wind Retrievals with Stereoscopic Views from MODIS and GOES (2019)
    In:  Other Sources
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    Publication Date: 2019-10-23
    Description: Atmospheric motion vectors (AMVs), derived by tracking patterns, represent the winds in a layer characteristic of the pattern. AMV height (or pressure), important for applications in atmospheric research and operational meteorology, is usually assigned using observed IR brightness temperatures with a modeled atmosphere and can be inaccurate. Stereoscopic tracking provides a direct geometric height measurement of the pattern that an AMV represents. We extend our previous work with multi-angle imaging spectroradiometer (MISR) and GOES to moderate resolution imaging spectroradiometer (MODIS) and the GOES-R series advanced baseline imager (ABI). MISR is a unique satellite instrument for stereoscopy with nine angular views along track, but its images have a narrow (380 km) swath and no thermal IR channels. MODIS provides a much wider (2330 km) swath and eight thermal IR channels that pair well with all but two ABI channels, o e ring a rich set of potential applications. Given the similarities between MODIS and VIIRS, our methods should also yield similar performance with VIIRS. Our methods, as enabled by advanced sensors like MODIS and ABI, require high-accuracy geographic registration in both systems but no synchronization of observations. AMVs are retrieved jointly with their heights from the disparities between triplets of ABI scenes and the paired MODIS granule. We validate our retrievals against MISR-GOES retrievals, operational GOES wind products, and by tracking clear-sky terrain. We demonstrate that the 3D-wind algorithm can produce high-quality AMV and height measurements for applications from the planetary boundary layer (PBL) to the upper troposphere, including cold-air outbreaks, wildfire smoke plumes, and hurricanes.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN74042 , Remote Sensing (ISSN 2072-4292) (e-ISSN 2072-4292); 11; 18
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    Thermospheric Heating and Cooling Times During Geomagnetic Storms, Including Extreme Events (2019)
    In:  CASI
    Details
    Publication Date: 2020-01-18
    Description: We present the first quantitative calculations of thermospheric heating and cooling times for geomagnetic storms of different intensity, including extreme events. We utilize the neutral mass density database of the CHAllenging Minisatellite Payload and Gravity Recovery And Climate Experiment missions to produce thermospheric global system response to geomagnetic storms caused by coronal mass ejections via superposed epoch analysis during May 2001 to December 2015. Storm events are grouped in five different categories based on the minimum value of the SYMH index. We calculate the time from storm onset for the thermosphere to reach maximum intensification (heating time) and the time from onset for the thermosphere to recover (cooling time). We find that heating and cooling times decrease as storm intensity increases and the effect is more pronounced for the cooling times. For extreme storms, the thermospheric heating time is 9.5 hr, while the cooling time is 22 hr.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN76908 , Geophysical Research Letters (ISSN 0094-8276) (e-ISSN 1944-8007); 46; 22; 12739-12746
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    The NASA Space Geodesy Network (2019)
    In:  CASI
    Details
    Publication Date: 2020-01-18
    Description: NASA successfully demonstrated next generation SLR, VLBI, and GNSS using the GGAO prototypes.Tier 1 deployment of next generation stations is underway: KPGO (Kokee Park, Hawaii); VGOS station operational; VGOS station at McDonald Observatory, Texas nearly operational; build of long-lead items for first 3 SLR stations underway. Planning and discussions with international partners for Tier 2 deployment underway. Plan for Decadal Survey responsive deployment acceleration under review by NASA.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN75240 , Unified Analysis Workshop 2019; Oct 02, 2019 - Oct 04, 2019; Paris; France
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    Methane Beneath Greenlands Ice Sheet Is Being Released (2019)
    In:  CASI
    Details
    Publication Date: 2020-01-15
    Description: Methane is a potent greenhouse gas, but a complete accounting of global methane sources and sinks is still ongoing. Sediments beneath glaciers and ice sheets harbour carbon reserves that, under certain conditions, can be converted to methane. However, the formation and release of such methane is an unquantified component of the arctic methane budget. Lamarche-Gagnon et al. present direct measurements of dissolved methane in proglacial discharge from a land-terminating glacier of the Greenland Ice Sheet. This proglacial discharge was supersaturated with methane and had diffusive methane fluxes similar to other terrestrial rivers for the duration of the summer measurement period. Their results suggest that variability in proglacial discharge is associated with methane release from subglacial environments, implicating both the form and evolution of the subglacial hydrologic system as a newly discovered control in the arctic methane cycle.The study by Lamarche-Gagnon et al. is an important example of how the cryosphere can interact with the surrounding Earth system in unexpected and potentially significant ways. Characterizing the ability of subglacial sediments to convert and store methane and the ability of the subglacial hydrologic system to export this methane to the atmosphere, through both modeling and observational studies, are critical steps in improving our knowledge of the sources and sinks of arctic methane and better constraining their future changes.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN64543 , Nature (ISSN 0028-0836) (e-ISSN 1476-4687); 565; 7737; 31-32
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    Magnetic Reconnection in a QuasiParallel Shock: TwoDimensional Local ParticleinCell Simulation (2019)
    In:  Other Sources
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    Publication Date: 2020-01-03
    Description: Magnetic reconnection in a quasiparallel bow shock is investigated with twodimensional local particleincell simulations. In the shock transition and downstream regions, large amplitude magnetic fluctuations exist, and abundant current sheets form. In some current sheets, reconnection occurs, and ionscale and electronscale magnetic islands are generated. In electronscale island regions, only electron outflow jets are observed, producing a quadrupolar outofplane magnetic field pattern, while in ionscale islands, both ions and electrons are involved and energized in reconnection. Normalized reconnection rates are obtained to be between around 0.1 to 0.2, and particle acceleration signatures are seen in distribution functions.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN76654 , Geophysical Research Letters (ISSN 0094-8276) (e-ISSN 1944-8007); 46; 16; 9352-9361
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    Examination of Separator Reconnection Rates in a Series of Adjacent Emerging/Existing Active Region Pairs (2019)
    In:  CASI
    Details
    Publication Date: 2019-12-17
    Description: No abstract available
    Keywords: Geophysics
    Type: MSFC-E-DAA-TN76220 , American Geophysical Union Fall Meeting; Dec 09, 2019 - Dec 13, 2019; San Francisco, CA; United States
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    Electron Diffusion Regions in Magnetotail Reconnection Under Varying Guide Fields (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-08
    Description: Kinetic structures of electron diffusion regions (EDRs) under finite guide fields in magnetotail reconnection are reported. The EDRs with guide fields 0.140.5 (in unit of the reconnecting component) are detected by the Magnetospheric Multiscale spacecraft. The key new features include the following: (1) cold inflowing electrons accelerated along the guide field and demagnetized at the magnetic field minimum while remaining a coherent population with a low perpendicular temperature, (2) wave fluctuations generating strong perpendicular electron flows followed by alternating parallel flows inside the reconnecting current sheet under an intermediate guide field, and (3) gyrophase bunched electrons with high parallel speeds leaving the Xline region. The normalized reconnection rates for the three EDRs range from 0.05 to 0.3. The measurements reveal that finite guide fields introduce new mechanisms to break the electron frozenin condition.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN73675 , Geophysical Research Letters (ISSN 0094-8276) (e-ISSN 1944-8007); 46; 12; 6230–6238
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    A Physical Model of Moulin Formation and Evolution (2019)
    In:  CASI
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    Publication Date: 2019-07-13
    Description: Nearly all proglacial water discharge from the present-day Greenland Ice Sheet is routed englacially via moulins. Identification of these moulins in high-resolution imagery is a frequent topic of study, but the processes controlling how and where moulins form, including on past ice sheets for which remote-sensing data are not available, remain poorly understood. Because moulins may reasonably compose approximately 10-15% of the englacial-subglacial hydrologic system, the evolution and shape of moulins can alter the timing of meltwater inputs to the bed. This evolution can impact both the form of the subglacial hydrologic system and the structure of associated geomorphological structures. Here, we develop a physical model of moulin formation and evolution to constrain the role of englacial processes in controlling the form and structure of the subglacial hydrologic system. Ice deformation within and around a moulin is both viscous and elastic, with the rate of turbulent and heat dissipation from water circulation in the moulin controlling both moulin wall melting and warming of the surrounding ice. We find moulin geometry is responsive to changes in these parameters over hours to days, indicating that diurnal and multi-day variations in surface melt can substantially alter the geometry of a moulin and the pressure-discharge relationship at the bed of the ice sheet. These results should be considered carefully when determining surface water inputs for subglacial hydrologic models. In the future, a parameter space study of these results will be combined with an analytic model to create a predictive, stochastic model of moulin and crevasse locations. This future model will be applicable to constraining the potential for surface-to-bed connections in regions where the exact ice-sheet surface morphology is not known, including ice sheets under future warming atmospheric conditions, and paleo ice sheets, where moulins created modern landforms.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN68842 , International Glaciological Society Symposium on Glacial Erosion and Sedimentation; May 12, 2019 - May 17, 2019; Madison, WI; United States
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    Formation of the Potential Jump over the Geomagnetically Quiet Sunlit Polar Cap Region (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-14
    Description: We consider the formation of a potential drop over the Earth's polar cap during geomagnetically quiet daytime. The observed potential drop is primarily defined by the hydrogen, photoelectron, and polar rain fluxes ratios and depends strongly on the energy distribution of the photoelectron flux. Polar rain is an essential component of the model required for plasma quasineutrality. The potential distribution along the magnetic field line has two regions, with a small, gradual, potential drop of 3 to 4 volts and a potential jump. The value of the potential jump depends on the hydrogen ion to photoelectron flux ratio and is also controlled by polar rain electrons. With quasineutrality required at its upper boundary, the jump only occurs in the presence of polar rain and its location depends on the polar rain flux. Model predictions compare well with FAST (Fast Auroral SnapshoT) observations presented by Kitamura et al.(2012, https://doi.org/10.1029/2011JA017459).
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN72183 , Journal of Geophysical Research: Space Physics (ISSN 2169-9380) (e-ISSN 2169-9402); 124; 6; 4384-4401
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    Average Path Profile of Atmospheric Temperature and Humidity Structure Parameters from a Microwave Profiling Radiometer (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-21
    Description: The values of the key atmospheric turbulence parameters (structure constants) for temperature and water vapor, that is, C(exp 2)(sub T), and C(exp 2)(sub Q), are highly dependent upon the vertical height within the atmosphere thus making it necessary to specify profiles of these values along the atmospheric propagation path. The remote sensing method suggested and described in this work makes use of a rapidly integrating microwave profiling radiometer to capture profiles of temperature and humidity through the atmosphere. The integration times of currently available profiling radiometers are such that they are approaching the temporal intervals over which one can possibly make meaningful assessments of these key atmospheric parameters. These integration times, coupled with the boundary effects of the Earths surface are, however, unconventional for turbulence characterization; the classical Kolmogorov turbulence theory and related 2/3 law for structure functions prevalent in the inertial subrange are no longer appropriate. An alternative to this classical approach is derived from first principles to account for the nuances of turbulent mechanics met with using radiometer sensing, that is, the large-scale turbulence driven by the various possible boundary conditions within the buoyancy subrange. Analytical expressions connecting the measured structure functions to the corresponding structure parameters are obtained. The theory is then applied to an experimental scenario involving radiometric profile measurements of temperature and shows very good results.
    Keywords: Geophysics
    Type: NASA/TP—2019-220300 , GRC-E-DAA-TN68884
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    NineteenthCentury Tides in the Gulf of Maine and Implications for Secular Trends (2019)
    In:  Other Sources
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    Publication Date: 2020-01-18
    Description: Since the early twentieth century, the amplitudes of tidal constituents in the Gulf of Maine and Bay of Fundy display clear secular trends that are among the largest anywhere observed for a regional body of water. The M2 amplitude at Eastport, Maine, increased at a rate of 14.1 1.2 cm per century until it temporarily dropped during 19801990, apparently in response to changes in the wider North Atlantic. Annual tidal analyses indicate M2 reached an alltime high amplitude last year (2018). Here we report new estimates of tides derived from nineteenth century waterlevel measurements found in the U.S. National Archives. Results from Eastport, Portland, and Pulpit Harbor (tied to Bar Harbor) do not follow the twentieth century trends and indicate that the Gulf of Maine tide changes commenced sometime in the late nineteenth or early twentieth centuries, coincident with a transition to modern rates of sealevel rise as observed at Boston and Portland. General agreement is that sea level rise alone is insufficient to cause the twentiethcentury tide changes. A role for ocean stratification is suggested by the longterm warming of Gulf of Maine waters; archival water temperatures at Boston, Portland, and Eastport show increases of 2 C since the 1880s. In addition, a changing seasonal dependence in M2 amplitudes is reflected in a changing seasonal dependence in water temperatures. The observations suggest that models seeking to reproduce Gulf of Maine tides must consider both sea level rise and longterm changes in stratification.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN76435 , Journal of Geophysical Research: Oceans (ISSN 2169-9291) (e-ISSN 2169-9291); 124; 10; 7046-7067
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    Applying the SPoRT Paradigm to Transitioning the Near Real-Time MAG4 Solar Event Forecast Model into Space Weather Operations (2019)
    In:  CASI
    Details
    Publication Date: 2019-12-19
    Description: No abstract available
    Keywords: Geophysics
    Type: MSFC-E-DAA-TN75661 , American Geophysical Union (AGU) Fall Meeting 2019; Dec 09, 2019 - Dec 13, 2019; San Francisco, CA; United States
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    Properties of Magnetic Reconnection and FTEs on the Dayside Magnetopause With and Without Positive IMF Bx Component During Southward IMF (2019)
    In:  Other Sources
    Details
    Publication Date: 2019-11-09
    Description: This paper describes properties and behavior of magnetic reconnection and flux transfer events (FTEs) on the dayside magnetopause using the global hybrid-Vlasov code Vlasiator. We investigate two simulation runs with and without a sunward (positive) B(sub x) component of the interplanetary magnetic field (IMF) when the IMF is southward. The runs are two-dimensional in real space in the noon-midnight meridional (polar) plane and three-dimensional in velocity space. Solar wind input parameters are identical in the two simulations with the exception that the IMF is purely southward in one but tilted 45 toward the Sun in the other. In the purely southward case (i.e., without B(sub x) the magnitude of the magnetosheath magnetic field component tangential to the magnetopause is larger than in the run with a sunward tilt. This is because the shock normal is perpendicular to the IMF at the equatorial plane, whereas in the other run the shock configuration is oblique and a smaller fraction of the total IMF strength is compressed at the shock crossing. Hence, the measured average and maximum reconnection rate are larger in the purely southward run. The run with tilted IMF also exhibits a north-south asymmetry in the tangential magnetic field caused by the different angle between the IMF and the bow shock normal north and south of the equator. Greater north-south asymmetries are seen in the FTE occurrence rate, size, and velocity as well; FTEs moving toward the Southern Hemisphere are larger in size and observed less frequently than FTEs in the Northern Hemisphere.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN73758 , Journal of Geophysical Research: Space Physics (e-ISSN 2169-9402); 124; 6; 4037-4048
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    Geophysics for Kids: The Experience of the Istituto Nazionale di Geofisica e Vulcanologia (Italy) (2018)
    Seismological Society of America
    Details
    Publication Date: 2018-02-16
    Description: Paper describing the outreach activities at INGV.
    Description: Published
    Description: 529-535
    Description: 2TM. Divulgazione Scientifica
    Description: JCR Journal
    Keywords: Kids ; Geophysics ; 05.03. Educational, History of Science, Public Issues
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Concerns about quadrupole ICP-MS lead isotopic data and interpretations in the environment and health fields (2018)
    MDPI AG
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in International Journal of Environmental Research and Public Health 15 (2018): 723, doi:10.3390/ijerph15040723.
    Description: There has been a massive increase in recent years of the use of lead (Pb) isotopes in attempts to better understand sources and pathways of Pb in the environment and in man or experimental animals. Unfortunately, there have been many cases where the quality of the isotopic data, especially that obtained by quadrupole inductively coupled plasma mass spectrometry (Q-ICP-MS), are questionable, resulting in questionable identification of potential sources, which, in turn, impacts study interpretation and conclusions. We present several cases where the isotopic data have compromised interpretation because of the use of only the major isotopes 208Pb/206Pb and 207Pb/206Pb, or their graphing in other combinations. We also present some examples comparing high precision data from thermal ionization (TIMS) or multi-collector plasma mass spectrometry (MC-ICP-MS) to illustrate the deficiency in the Q-ICP-MS data. In addition, we present cases where Pb isotopic ratios measured on Q-ICP-MS are virtually impossible for terrestrial samples. We also evaluate the Pb isotopic data for rat studies, which had concluded that Pb isotopic fractionation occurs between different organs and suggest that this notion of biological fractionation of Pb as an explanation for isotopic differences is not valid. Overall, the brief review of these case studies shows that Q-ICP-MS as commonly practiced is not a suitable technique for precise and accurate Pb isotopic analysis in the environment and health fields
    Keywords: Lead isotopes ; ICP-MS ; TIMS ; MC-ICP-MS ; Environment ; Humans ; Rats ; Fractionation
    Repository Name: Woods Hole Open Access Server
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    Frustrated Kondo chains and glassy magnetic phases on the pyrochlore lattice (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-12-14
    Description: Author(s): Jing Luo and Gia-Wei Chern We present an extensive numerical study of a type of frustrated itinerant magnetism on the pyrochlore lattice. In this theory, the pyrochlore magnet can be viewed as a cross-linking network of Kondo or double-exchange chains. Contrary to models based on Mott insulators, this itinerant magnetism appr... [Phys. Rev. B 98, 214423] Published Thu Dec 13, 2018
    Keywords: Magnetism
    Print ISSN: 1098-0121
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    Assembly of eight spherical magnets into a dotriacontapole configuration (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-12-14
    Description: Author(s): Stefan Hartung, Felix Sommer, Simeon Völkel, Johannes Schönke, and Ingo Rehberg The magnetic field of a cuboidal cluster of eight magnetic spheres is measured. It decays with the inverse seventh power of the distance. This corresponds formally to a multipole named a dotriacontapole. This strong decay is explained on the basis of dipole-dipole interaction and the symmetry of the... [Phys. Rev. B 98, 214424] Published Thu Dec 13, 2018
    Keywords: Magnetism
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    Quantum collapse of a magnetic skyrmion (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-26
    Description: Author(s): Amel Derras-Chouk, Eugene M. Chudnovsky, and Dmitry A. Garanin Large thermal fluctuations can destroy skyrmions - tiny speckles of rotated magnetization in two-dimensional films. Yet at low temperatures skyrmions are believed to be topologically stable, which makes them good candidates for data storage and processing. However, as the authors demonstrate here, even at zero temperature a nanoscale skyrmion is not protected against quantum decay. The theory is based on the imaginary-time dynamics of the skyrmion. Due to the fact that even the smallest skyrmion is still formed by many atomic spins, its quantum decay provides an example of a nanoscale Schrödinger’s cat that one can study with modern measuring techniques. [Phys. Rev. B 98, 024423] Published Wed Jul 25, 2018
    Keywords: Magnetism
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    High figure of merit magneto-optics from interfacial skyrmions on topological insulators (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-26
    Description: Author(s): Tonmoy K. Bhowmick, Amrit De, and Roger K. Lake In the Kerr rotation geometry, magneto-optic memory devices typically suffer from low figure-of-merit (FOM) and long write times. We show that skyrmions formed at the interface of a thin-film multiferroic and a topological insulator can give rise to high FOM magneto-optic Kerr effects (MOKEs). Huge ... [Phys. Rev. B 98, 024424] Published Wed Jul 25, 2018
    Keywords: Magnetism
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    High magnetocaloric efficiency of a NiFe/NiCu/CoFe/MnIr multilayer in a small magnetic field (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-27
    Description: Author(s): S. N. Vdovichev, N. I. Polushkin, I. D. Rodionov, V. N. Prudnikov, J. Chang, and A. A. Fraerman The isothermal magnetic entropy changes Δ S (i.e., the magnetocaloric potential) are studied in Ni 80 Fe 20 / Ni 67 C u 33 / Co 90 Fe 10 / Mn 80 Ir 20 stacks at temperatures near the Curie point of the Ni 67 C u 33 spacer by applying magnetic fields of a few milli-Tesla. Such fields were sufficient for toggling magnetic mo... [Phys. Rev. B 98, 014428] Published Thu Jul 26, 2018
    Keywords: Magnetism
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    Magnetic field induced phenomena in UIrGe in fields applied along the $b$ axis (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-27
    Description: Author(s): Jiří Pospíšil, Yoshinori Haga, Yoshimitsu Kohama, Atsushi Miyake, Shinsaku Kambe, Naoyuki Tateiwa, Michal Vališka, Petr Proschek, Jan Prokleška, Vladimír Sechovský, Masashi Tokunaga, Koichi Kindo, Akira Matsuo, and Etsuji Yamamoto The metamagnetic transition between the antiferromagnetic and paramagnetic state in UIrGe has been studied at various temperatures by magnetization, heat capacity, and magnetocaloric-effect measurements on a single crystal in static and pulsed magnetic fields applied along the orthorhombic b axis. A... [Phys. Rev. B 98, 014430] Published Thu Jul 26, 2018
    Keywords: Magnetism
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    Effect of uniaxial stress on the magnetic phases of ${\mathrm{CeAuSb}}_{2}$ (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-27
    Description: Author(s): Joonbum Park, Hideaki Sakai, Andrew P. Mackenzie, and Clifford W. Hicks We present results of measurements of resistivity of CeAuSb 2 under the combination of c -axis magnetic field and in-plane uniaxial stress. In unstressed CeAuSb 2 there are two magnetic phases. The low-field A phase is a single-component spin-density wave (SDW), with q = ( η , ± η , 1 / 2 ) , and the high-field B ... [Phys. Rev. B 98, 024426] Published Thu Jul 26, 2018
    Keywords: Magnetism
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    Phase transitions of a two-dimensional deformed Affleck-Kennedy-Lieb-Tasaki model (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-28
    Description: Author(s): Nicholas Pomata, Ching-Yu Huang, and Tzu-Chieh Wei We study spin-2 deformed-AKLT models on the square lattice, specifically a two-parameter family of O ( 2 ) -symmetric ground-state wave functions as defined by Niggemann, Klümper, and Zittartz, who found previously that the phase diagram consists of a Néel-ordered phase and a disordered phase which cont... [Phys. Rev. B 98, 014432] Published Fri Jul 27, 2018
    Keywords: Magnetism
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    Twisted skyrmions at domain boundaries and the method of image skyrmions (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-28
    Description: Author(s): Huanhuan Yang, C. Wang, Xiaofan Wang, X. S. Wang, Yunshan Cao, and Peng Yan We predict a twisted skyrmion structure at the boundary of two antiparallel magnetic domains stabilized by a (synthetic or crystal) antiferromagnetic coupling on the border. Through this novel state, skyrmions with opposite polarities can be freely switched between each other by spin-polarized elect... [Phys. Rev. B 98, 014433] Published Fri Jul 27, 2018
    Keywords: Magnetism
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    Ferromagnetic resonance in core-shell nanoparticles with multitype exchange anisotropy (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-31
    Description: Author(s): I. S. Poperechny and Yu. L. Raikher A phenomenological model for magnetodynamics of core-shell nanoparticles is presented. The term core-shell implies, prima facie , that the spin structures (phases) of the particle components are different, no matter whether or not they are chemically identical. The model takes in two main assumptions... [Phys. Rev. B 98, 014434] Published Mon Jul 30, 2018
    Keywords: Magnetism
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    Magnetic reversal in $\mathrm{S}{\mathrm{r}}_{4}\mathrm{R}{\mathrm{u}}_{3}{\mathrm{O}}_{10}$ nanosheets probed by anisotropic magnetoresistance (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-26
    Description: Author(s): Yan Liu, Weiwei Chu, Jiyong Yang, Guoqiang Liu, Haifeng Du, Wei Ning, Langsheng Ling, Wei Tong, Zhe Qu, Gang Cao, Zhuan Xu, and Mingliang Tian The origin of the unusual second magnetic transition at a temperature T M in the ruthenate S r 4 R u 3 O 10 remains elusive. Here, we have investigated the thickness-dependent anisotropic magnetoresistance of S r 4 R u 3 O 10 nanosheets, and clearly found that the sign of the magnetoresistance (MR) presents an unu... [Phys. Rev. B 98, 024425] Published Wed Jul 25, 2018
    Keywords: Magnetism
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    Chiral skyrmions in an anisotropy gradient (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-07-25
    Description: Author(s): R. Tomasello, S. Komineas, G. Siracusano, M. Carpentieri, and G. Finocchio A strategy to drive skyrmion motion by a combination of an anisotropy gradient and spin-Hall effect has recently been demonstrated. Here, we study the fundamental properties of this type of motion by combining micromagnetic simulations and a generalized Thiele's equation. We find that the anisotropy... [Phys. Rev. B 98, 024421] Published Tue Jul 24, 2018
    Keywords: Magnetism
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    Domain formation in rectangular magnetic nanoparticle assemblies (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-08-02
    Description: Author(s): Alexander Fabian, Michael Czerner, Christian Heiliger, Matthias T. Elm, Detlev M. Hofmann, and Peter J. Klar Rectangular assemblies with different aspect ratios were prepared with spherical magnetite nanoparticles (diameter d = 20 nm ) on lithographically patterned substrates using a variant of the meniscus force deposition method. The aspect ratio (width:length) of the rectangular assemblies was varied from v... [Phys. Rev. B 98, 054401] Published Wed Aug 01, 2018
    Keywords: Magnetism
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    Detecting end states of topological quantum paramagnets via spin Hall noise spectroscopy (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-08-02
    Description: Author(s): Darshan G. Joshi, Andreas P. Schnyder, and So Takei We theoretically study the equilibrium spin current fluctuations and the corresponding charge noise generated by the inverse spin Hall effect (ISHE) in a metal with strong spin-orbit coupling deposited on top of a quantum paramagnet. It is shown that the charge noise power spectra measured along dif... [Phys. Rev. B 98, 064401] Published Wed Aug 01, 2018
    Keywords: Magnetism
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    Nanoscale magnetic localization in exchange strength modulated ferromagnets (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-08-04
    Description: Author(s): B. J. Kirby, L. Fallarino, P. Riego, B. B. Maranville, Casey W. Miller, and A. Berger Although ferromagnetism is in general a long-range collective phenomenon, it is possible to induce local spatial variations of magnetic properties in ferromagnetic materials. For example, systematic variation of the exchange coupling strength can be used to create systems that behave as if they are ... [Phys. Rev. B 98, 064404] Published Fri Aug 03, 2018
    Keywords: Magnetism
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    Homogeneous and heterogeneous nucleation of skyrmions in thin layers of cubic helimagnets (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-08-07
    Description: Author(s): A. O. Leonov and K. Inoue Formation of isolated chiral skyrmions by homogeneous and heterogeneous nucleation has been studied in thin layers of cubic helimagnets via elongation of torons and chiral bobbers, respectively. Both torons and bobbers are localized in three dimensions, contain singularities, and, according to the t... [Phys. Rev. B 98, 054404] Published Mon Aug 06, 2018
    Keywords: Magnetism
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    Spin-wave dynamics in artificial anti-spin-ice systems: Experimental and theoretical investigations (2018)
    American Physical Society (APS)
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    Publication Date: 2018-08-07
    Description: Author(s): S. Mamica, X. Zhou, A. Adeyeye, M. Krawczyk, and G. Gubbiotti Reversed structures of artificial spin-ice systems, where elongated holes with elliptical shape (antidots) are arranged into a square array with two orthogonal sublattices, are referred to as antisquared spin ice. Using Brillouin light-scattering spectroscopy and plane-wave-method calculations, we i... [Phys. Rev. B 98, 054405] Published Mon Aug 06, 2018
    Keywords: Magnetism
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    Metamagnetism and zero-scale-factor universality in the two-dimensional $J\text{−}Q$ model (2018)
    American Physical Society (APS)
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    Publication Date: 2018-08-07
    Description: Author(s): Adam Iaizzi, Kedar Damle, and Anders W. Sandvik Using a combination of quantum Monte Carlo and exact methods, we study the field-driven saturation transition of the two-dimensional J − Q model, in which the antiferromagnetic Heisenberg exchange ( J ) coupling competes with an additional four-spin interaction ( Q ) that favors valence-bond solid order. ... [Phys. Rev. B 98, 064405] Published Mon Aug 06, 2018
    Keywords: Magnetism
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    Observation of spontaneous ferriquadrupolar order in $\mathrm{KDy}{({\mathrm{MoO}}_{4})}_{2}$ (2018)
    American Physical Society (APS)
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    Publication Date: 2018-08-07
    Description: Author(s): A. A. Zvyagin, K. Kutko, D. Kamenskyi, A. V. Peschanskii, S. Poperezhai, and N. M. Nesterenko Using Raman and infrared spectroscopies, spontaneous ferriquadrupolar ordering has been observed in the rare-earth-based system KDy ( MoO 4 ) 2 . Ordered quadrupoles in the electron subsystem attend nonequivalent distortions of rare-earth ions in the ordered phase. A mean-field theory explaining the onset... [Phys. Rev. B 98, 064406] Published Mon Aug 06, 2018
    Keywords: Magnetism
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    Noncollinear magnetism in nanosized cobalt chromite (2018)
    American Physical Society (APS)
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    Publication Date: 2018-08-07
    Description: Author(s): D. Zákutná, J. Vlček, P. Fitl, K. Nemkovski, D. Honecker, D. Nižňanský, and S. Disch Using a combination of neutron diffraction with XYZ polarization analysis and magnetization measurements, the noncollinear magnetism in nanosized cobalt chromite, a potential multiferroic material, is revealed. For noninteracting 26.9(1) nm nanoparticles, a bulklike behavior is identified, including... [Phys. Rev. B 98, 064407] Published Mon Aug 06, 2018
    Keywords: Magnetism
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    Orbital magnetic quadrupole moment and nonlinear anomalous thermoelectric transport (2018)
    American Physical Society (APS)
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    Publication Date: 2018-08-07
    Description: Author(s): Yang Gao and Di Xiao We present a microscopic theory of the orbital magnetic quadrupole moment density Q i j in periodic crystals with combined time-reversal ( T ) and inversion ( I ) symmetry. We obtain a gauge-invariant expression with a clear physical interpretation and demonstrate the typical behavior of Q i j in a minimal ... [Phys. Rev. B 98, 060402(R)] Published Mon Aug 06, 2018
    Keywords: Magnetism
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    Magnetic anisotropy in permalloy: Hidden quantum mechanical features (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-05
    Description: Author(s): Debora C. M. Rodrigues, Angela B. Klautau, Alexander Edström, Jan Rusz, Lars Nordström, Manuel Pereiro, Björgvin Hjörvarsson, and Olle Eriksson By means of relativistic, first principles calculations, we investigate the microscopic origin of the vanishingly low magnetic anisotropy of Permalloy, here proposed to be intrinsically related to the local symmetries of the alloy. It is shown that the local magnetic anisotropy of individual atoms i... [Phys. Rev. B 97, 224402] Published Mon Jun 04, 2018
    Keywords: Magnetism
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    Intrinsic hysteresis due to the surface barrier for chiral solitons in monoaxial chiral helimagnets (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-14
    Description: Author(s): M. Shinozaki, Y. Masaki, R. Aoki, Y. Togawa, and Y. Kato Chiral solitons in monoaxial chiral magnets undergo a surface barrier, which is analogous to the Bean-Livingston barrier in type-II superconductors. The authors argue here that the surface barrier is the main mechanism for large hysteresis observed in magnetoresistance (MR) measurements on micrometer-sized samples of CrNb 3 S 6 . In the MR hysteresis, a conspicuous jump is observed at the field H b for decreasing fields. Experimental results for H b ∼ 0 . 4 H c (with thermodynamic critical field H c ) and the theoretical result H b / H c = 4 / π 2 are in good agreement with each other. The surface barrier is regarded as a common property of systems (superconductors, chiral magnets, and chiral liquid crystals) that exhibit continuous transitions of the nucleation type. [Phys. Rev. B 97, 214413] Published Wed Jun 13, 2018
    Keywords: Magnetism
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    Calculating the transport properties of magnetic materials from first principles including thermal and alloy disorder, noncollinearity, and spin-orbit coupling (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-14
    Description: Author(s): Anton A. Starikov, Yi Liu, Zhe Yuan, and Paul J. Kelly A density functional theory based two-terminal scattering formalism that includes spin-orbit coupling and spin noncollinearity is described. An implementation using tight-binding muffin-tin orbitals combined with extensive use of sparse matrix techniques allows a wide variety of inhomogeneous struct... [Phys. Rev. B 97, 214415] Published Wed Jun 13, 2018
    Keywords: Magnetism
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    Field dependence of nonreciprocal magnons in chiral MnSi (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-06-06
    Description: Author(s): T. Weber, J. Waizner, G. S. Tucker, R. Georgii, M. Kugler, A. Bauer, C. Pfleiderer, M. Garst, and P. Böni Spin waves in chiral magnetic materials are strongly influenced by the Dzyaloshinskii-Moriya interaction, resulting in intriguing phenomena like nonreciprocal magnon propagation and magnetochiral dichroism. Here, we study the nonreciprocal magnon spectrum of the archetypical chiral magnet MnSi and i... [Phys. Rev. B 97, 224403] Published Tue Jun 05, 2018
    Keywords: Magnetism
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    Nonswitchable polarization and magnetoelectric coupling in the high-pressure synthesized doubly ordered perovskites $\mathrm{NaYMnW}{\mathrm{O}}_{6}$ and $\mathrm{NaHoCoW}{\mathrm{O}}_{6}$ (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-15
    Description: Author(s): Chandan De and A. Sundaresan The doubly ordered perovskites Na L n MnW O 6 ( L n = La , Nd, and Tb), Na L n FeW O 6 ( L n = La and Nd), and Na L n CoW O 6 ( L n = Sm − Er , Yb, and Y) have been reported to be potential multiferroics because of their polar crystal structure ( P 2 1 ) and antiferromagnetic ordering of the transition-metal ions at low temperatures.... [Phys. Rev. B 97, 214418] Published Thu Jun 14, 2018
    Keywords: Magnetism
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  • 84
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    Electric and magnetic gating of Rashba-active weak links (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-16
    Description: Author(s): A. Aharony, O. Entin-Wohlman, M. Jonson, and R. I. Shekhter In a one-dimensional weak-link wire the spin-orbit interaction (SOI) alone cannot generate a nonzero spin current. We show that a Zeeman field acting in the wire in conjunction with the Rashba SOI there does yield such a current, whose magnitude and direction depend on the direction of the field. Wh... [Phys. Rev. B 97, 220404(R)] Published Fri Jun 15, 2018
    Keywords: Magnetism
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  • 85
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    Magnetism and the phase diagram of ${\mathrm{MnSb}}_{2}{\mathrm{O}}_{6}$ (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-16
    Description: Author(s): C. Koo, J. Werner, M. Tzschoppe, M. Abdel-Hafiez, P. K. Biswas, R. Sarkar, H.-H. Klauss, G. V. Raganyan, E. A. Ovchenkov, A. Yu. Nikulin, A. N. Vasiliev, E. A. Zvereva, and R. Klingeler Static and dynamic magnetic properties of P 3 ¯ 1 m -phase MnSb 2 O 6 have been studied by means of muon-spin relaxation ( μ SR ), high-frequency electron-spin resonance (HF-ESR), specific heat, and magnetization studies in magnetic fields up to 25 T. The data imply onset of long-range antiferromagnetic order ... [Phys. Rev. B 97, 224416] Published Fri Jun 15, 2018
    Keywords: Magnetism
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  • 86
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    Scaling of nonlinear susceptibilities in an artificial permalloy honeycomb lattice (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-19
    Description: Author(s): A. Dahal, Y. Chen, B. Summers, and D. K. Singh Two-dimensional artificial magnetic honeycomb lattice is predicted to manifest several magnetic phase transitions as a function of reducing temperature. We have performed the analysis of nonlinear susceptibility to explore the equilibrium nature of phase transition in artificial honeycomb lattice of... [Phys. Rev. B 97, 214420] Published Mon Jun 18, 2018
    Keywords: Magnetism
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  • 87
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    Spontaneous distortion via the appearance of ferromagnetism in Pd ultrathin films: Observation of an inverse mechanism for the Stoner criterion (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-19
    Description: Author(s): Shunsuke Sakuragi, Hiroo Tajiri, Hiroyuki Kageshima, and Tetsuya Sato We study the crystal structure of Pd(100) ultrathin films, which show ferromagnetism induced by the quantum confinement effect, using in situ x-ray crystal truncation rod measurement and density functional calculation. The energy gain from the appearance of ferromagnetism in Pd results in flatter an... [Phys. Rev. B 97, 214421] Published Mon Jun 18, 2018
    Keywords: Magnetism
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  • 88
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    Strong anomalous Nernst effect in collinear magnetic Weyl semimetals without net magnetic moments (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-19
    Description: Author(s): Jonathan Noky, Jacob Gayles, Claudia Felser, and Yan Sun We predict a large anomalous Nernst effect in the inverse Heusler compensated ferrimagnets Ti 2 Mn X ( X = Al , Ga, and In) with vanishing net magnetic moments. Though the net magnetic moment is zero, the Weyl points in these systems lead to a large anomalous Nernst conductivity (ANC) due to the lack of a ... [Phys. Rev. B 97, 220405(R)] Published Mon Jun 18, 2018
    Keywords: Magnetism
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  • 89
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    Spin glass in the bond-diluted ${J}_{1}−{J}_{2}$ Ising model on the square lattice (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-19
    Description: Author(s): Yining Xu and Dao-Xin Yao We use Monte Carlo (MC) methods to simulate a two-dimensional (2D) bond-diluted Ising model on the square lattice, which has frustration between nearest-neighbor interaction J 1 and next-nearest-neighbor interaction J 2 . In this study, we use the parallel tempering algorithm to study thermodynamics fo... [Phys. Rev. B 97, 224419] Published Mon Jun 18, 2018
    Keywords: Magnetism
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  • 90
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    Finite-barrier correction for the ferromagnetic resonance frequency of nanomagnets with various magnetocrystalline anisotropies (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-19
    Description: Author(s): Yuri P. Kalmykov, Serguey V. Titov, William T. Coffey, and William J. Dowling Finite-barrier corrections to the ferromagnetic resonance (FMR) frequency of nanomagnets are obtained in closed integral form from the undamped deterministic equation of motion of the magnetization by averaging the precession frequency as expressed by elliptic functions over all possible precessiona... [Phys. Rev. B 97, 224418] Published Mon Jun 18, 2018
    Keywords: Magnetism
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  • 91
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    Coupling of magnetic order and charge transport in the candidate Dirac semimetal ${\mathrm{EuCd}}_{2}{\mathrm{As}}_{2}$ (2018)
    American Physical Society (APS)
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    Publication Date: 2018-06-21
    Description: Author(s): M. C. Rahn, J.-R. Soh, S. Francoual, L. S. I. Veiga, J. Strempfer, J. Mardegan, D. Y. Yan, Y. F. Guo, Y. G. Shi, and A. T. Boothroyd We use resonant elastic x-ray scattering to determine the evolution of magnetic order in EuCd 2 As 2 below T N = 9.5 K, as a function of temperature and applied magnetic field. We find an A -type antiferromagnetic structure with in-plane magnetic moments, and observe dramatic magnetoresistive effects assoc... [Phys. Rev. B 97, 214422] Published Wed Jun 20, 2018
    Keywords: Magnetism
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  • 92
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    Magnetic inhomogeneity in the copper pseudochalcogenide CuNCN (2018)
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    Publication Date: 2018-06-28
    Description: Author(s): A. Zorko, P. Jeglič, M. Pregelj, D. Arčon, H. Luetkens, A. L. Tchougréeff, and R. Dronskowski Copper carbodiimide, CuNCN, is a geometrically frustrated nitrogen-based analog of cupric oxide, whose magnetism remains ambiguous. Here, we employ a combination of local-probe techniques, including Cu 63 , 65 nuclear quadrupole resonance, C 13 nuclear magnetic resonance, and muon spin rotation to show ... [Phys. Rev. B 97, 214432] Published Wed Jun 27, 2018
    Keywords: Magnetism
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  • 93
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    Impact of interface structure on magnetic exchange coupling in $\mathrm{MnBi}/{\mathrm{Fe}}_{x}{\mathrm{Co}}_{1−x}$ bilayers (2018)
    American Physical Society (APS)
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    Publication Date: 2018-11-30
    Description: Author(s): S. Sabet, A. Moradabadi, S. Gorji, M. Yi, Q. Gong, M. H. Fawey, E. Hildebrandt, D. Wang, H. Zhang, B.-X. Xu, C. Kübel, and L. Alff Magnetic exchange coupling behavior was investigated in MnBi/FeCo bilayer system at the hard/soft magnetic interface. We performed a combined study of cross-sectional high resolution transmission electron microscopy (HR-TEM), DFT calculations, and micromagnetic simulations to elucidate effect of int... [Phys. Rev. B 98, 174440] Published Thu Nov 29, 2018
    Keywords: Magnetism
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  • 94
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    Nonequilibrium selection of magnetic order in a driven triangular XY antiferromagnet (2018)
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    Publication Date: 2018-11-30
    Description: Author(s): Yuan Wan and Roderich Moessner We show that a weak periodic drive removes the accidental degeneracy in the ground state of the XY antiferromagnet on the triangular lattice in a uniform static magnetic field. The underlying mechanism involves adding a small periodically modulated component to the magnetic field, which influences f... [Phys. Rev. B 98, 184432] Published Thu Nov 29, 2018
    Keywords: Magnetism
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  • 95
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    Stability of the skyrmion lattice near the critical temperature in cubic helimagnets (2018)
    American Physical Society (APS)
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    Publication Date: 2018-12-06
    Description: Author(s): Victor Laliena, Germán Albalate, and Javier Campo The phase diagram of cubic helimagnets near the critical temperature is obtained from a Landau-Ginzburg model, including fluctuations to Gaussian level. The free energy is evaluated via a saddle-point expansion around the local minima of the Landau-Ginzburg functional. The local minima are computed ... [Phys. Rev. B 98, 224407] Published Wed Dec 05, 2018
    Keywords: Magnetism
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  • 96
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    Multiple-$Q$ magnetic orders in Rashba-Dresselhaus metals (2018)
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    Publication Date: 2018-12-06
    Description: Author(s): Ken N. Okada, Yasuyuki Kato, and Yukitoshi Motome We study magnetic textures realized in noncentrosymmetric Kondo lattice models in which localized magnetic moments weakly interact with itinerant electrons subject to Rashba and Dresselhaus spin-orbit couplings. By virtue of state-of-the-art numerical simulations as well as variational calculations,... [Phys. Rev. B 98, 224406] Published Wed Dec 05, 2018
    Keywords: Magnetism
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    Colossal refrigerant capacity in $[\mathrm{Fe}{(\mathrm{hyptrz})}_{3}]{\mathrm{A}}_{2}·{\mathrm{H}}_{2}\mathrm{O}$ around the freezing temperature of water (2018)
    American Physical Society (APS)
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    Publication Date: 2018-12-06
    Description: Author(s): P. J. von Ranke, B. P. Alho, R. M. Ribas, E. P. Nobrega, A. Caldas, V. S. R. de Sousa, M. V. Colaço, Lippy F. Marques, Daniel L. Rocco, and P. O. Ribeiro We report a giant barocaloric effect in the spin-crossover compound [ Fe ( hyptrz ) 3 ] A 2 · H 2 O with hyptzr = 4 -(3′-hydroxypropyl)-1,2,4-triazole and A = 4 -chlorobenzenesulfonate. The origin of the giant barocaloric effect comes from the strong coupling between the lattice vibration and the electronic states t 2 ... [Phys. Rev. B 98, 224408] Published Wed Dec 05, 2018
    Keywords: Magnetism
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    Field-induced quantum magnetism in the verdazyl-based charge-transfer salt $[o\text{−}\mathrm{MePy}\text{−}\mathrm{V}\text{−}{(p\text{−}\mathrm{Br})}_{2}]{\mathrm{FeCl}}_{4}$ (2018)
    American Physical Society (APS)
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    Publication Date: 2018-12-08
    Description: Author(s): Y. Iwasaki, T. Kida, M. Hagiwara, T. Kawakami, Y. Kono, S. Kittaka, T. Sakakibara, Y. Hosokoshi, and H. Yamaguchi We successfully synthesized a verdazyl-based charge-transfer salt [ o − MePy − V − ( p − Br ) 2 ] FeCl 4 , which has S V = 1 / 2 on the radical o − MePy − V − ( p − Br ) 2 and S Fe = 5 / 2 on the FeCl 4 anion. Ab initio molecular orbital calculations indicate the formation of an S V = 1 / 2 honeycomb lattice composed of three types of exchan... [Phys. Rev. B 98, 224411] Published Fri Dec 07, 2018
    Keywords: Magnetism
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  • 99
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    Vibrational properties and magnetic specific heat of the covalent chain antiferromagnet $\mathrm{RbFeS}{\mathrm{e}}_{2}$ (2018)
    American Physical Society (APS)
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    Publication Date: 2018-12-11
    Description: Author(s): A. G. Kiiamov, Y. V. Lysogorskiy, F. G. Vagizov, L. R. Tagirov, D. A. Tayurskii, Z. Seidov, H.-A. Krug von Nidda, V. Tsurkan, D. Croitori, A. Günther, F. Mayr, and A. Loidl The magnetic specific heat of RbFeS e 2 and the spin state of F e 3 + ions in the compound have been studied. Phonon dispersion and phonon density of states (PDOS), element specific and total, were evaluated from first-principles calculations. It is shown that iron atoms in quasi-one-dimensional chains h... [Phys. Rev. B 98, 214411] Published Mon Dec 10, 2018
    Keywords: Magnetism
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    Magnetic properties and field-driven dynamics of chiral domain walls in epitaxial ${\mathrm{Pt}\text{/}\mathrm{Co}\text{/}\mathrm{Au}}_{x}{\mathrm{Pt}}_{1−x}$ trilayers (2018)
    American Physical Society (APS)
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    Publication Date: 2018-12-11
    Description: Author(s): Kowsar Shahbazi, Aleš Hrabec, Simone Moretti, Michael B. Ward, Thomas A. Moore, Vincent Jeudy, Eduardo Martinez, and Christopher H. Marrows Chiral domain walls in ultrathin perpendicularly magnetized layers have a Néel structure stabilized by a Dzyaloshinskii-Moriya interaction (DMI) that is generated at the interface between the ferromagnet and a heavy metal. Different interface materials or properties are required above and below a fe... [Phys. Rev. B 98, 214413] Published Mon Dec 10, 2018
    Keywords: Magnetism
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