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  • 1
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    The Great Ordovician Biodiversification Event: Insights from the Tafilalt Biota, Morocco (2018)
    London : The Geological Society
    Details
    Keywords: palaeobiology ; fossil ; fauna ; Erfoud region ; Great Ordovician ; Morocco
    Description / Table of Contents: 24 September 2018 --- Brachiopods from the Upper Ordovician of Erfoud (eastern Anti-Atlas, Morocco) and the stratigraphic correlation of the bryozoan-rich Khabt-el Hajar Formation / Enrique Villas and Jorge Colmenar / Geological Society, London, Special Publications, 485, 24 September 2018, https://doi.org/10.1144/SP485.2 --- New Upper Ordovician edrioasteroids from Morocco / Colin D. Sumrall and Samuel Zamora / Geological Society, London, Special Publications, 485, 24 September 2018, https://doi.org/10.1144/SP485.6 --- Late Ordovician crinoids from the Anti-Atlas region of Morocco / Joseph P. Botting / Geological Society, London, Special Publications, 485, 24 September 2018, https://doi.org/10.1144/SP485.4 --- A synopsis of Late Ordovician brachiopod diversity in the Anti-Atlas, Morocco / J. Colmenar, E. Villas and C. M. Ø. Rasmussen / Geological Society, London, Special Publications, 485, 24 September 2018, https://doi.org/10.1144/SP485.3
    Edition: online first
    URL: https://sp.lyellcollection.org/online-first/485
    Language: English
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  • 2
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    GPS, scaling exponent and past seismicity for seismic hazard assessment in Garhwal–Kumaun, Himalayan region (2019)
    Details
    Publication Date: 2019-12-09
    Description: The world’s most geologically complex Himalayan arc is well known for its tectonic and seismic activities due to the collision of Indian and Eurasian plates. Based on these elements [global positioning system (GPS) deformation measurements, scaling exponent (D) of the tectonic elements and past seismicity] studied here can contribute to better understanding of dynamics and complexities of earthquakes occurrence in any region. In the present paper, the crustal deformation is analyzed with the 3-year campaign and continuous GPS sites data. The velocity vectors of the sites with IGS05 reference frame ranges from 35 to 50 mm/year and give strain-rate measurements up to 130 9 10 -9 strain/year. Further, the study region was divided into number of blocks of 1° 9 1° that gives different D value based on the presence and distribution of tectonic elements in a particular block. One of the blocks was identified with very high D value of 1.82, where the least seismic activity and extensive convergence due to strain accumulation in comparison with other blocks of higher capacity dimensional value has been observed. Particularly this block lying between latitude 29°N–30°N and longitude 79°E–80°E is considered to be the probable highest seismic hazard zone in the study area. Significance of the combined application of GPS study, scaling exponent and the characteristics of seis- micity are stated as helpful methods in the identification of hazardous zone in the Eastern part of the central seismic gap in the Himalaya or in any active areas of the world
    Description: Published
    Description: 1349–1367
    Description: 2T. Deformazione crostale attiva
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    Validation of the global land cover 2000 map (2006)
    In:  IEEE Transactions on Geoscience and Remote Sensing
    Details
    Publication Date: 2022-05-11
    Type: info:eu-repo/semantics/article
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  • 4
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    Numerical Investigation of Cloud Droplet Temperature and Radius in Sub-saturated Environments with Implication for Ice Nucleation (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-03
    Description: Cloud droplet temperature plays a key role in fundamental cloud microphysical and radiative processes, affecting cloud radiative effects and remote sensing of cloud properties. The supercooled droplet temperature impacts cloud ice and precipitation formation via homogeneous freezing and activation of ice-nucleating particles through contact and immersion freezing. Most observational and numerical studies assume that the droplet temperature is uniform and equal to the ambient temperature. This is not always the case, especially when the droplet is exposed to strong relative humidity gradients at the edges of a cloud. This study investigates the spatiotemporal evolution of the droplet temperature, radius, and its environment under various initial droplet characteristics, and environmental conditions, including ambient pressure, temperature, and relative humidity. An advanced numerical model is used to solve Navier-Stokes and continuity equations, coupled with heat and vapor transport, to simulate the drop interior and the moving droplet boundary, including thermal and vapor density gradients in the ambient air domain. Results include the evolution of internal thermal gradients within the droplet and the impacts of evaporative cooling on decreasing droplet surface temperatures, by at least 10 degrees within a second under certain environments, and droplet evaporation rates. The study underscores the need to improve the existing ice nucleation parameterization schemes to consider the decrease in droplet temperature due to evaporative cooling and provides important benchmark results useful for direct numerical simulation and coarser resolution models. The modeling framework can also be adapted to study supercooled droplets freezing on a substrate or melting of hailstones.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 5
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    Modelling of seismic anisotropy with rheologically constrained geodynamic setup (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-12-12
    Description: Seismic anisotropy is an observation that is believed to yield information on the flow pattern in the mantle. There are many studies of anisotropy in the upper mantle; however, the lower mantle is still underexplored, due to problems in seismic imaging and complexities of modelling of flow laws of different minerals. In this study, we modelled the radially anisotropic behavior of two different geodynamic setups, one is the rising of a mantle plume from the core-mantle boundary to the surface, and another is subduction of a slab reaching the lowermost mantle. We use ASPECT for modelling large scale mantle flow and ECOMAN to simulate the development of lattice preferred orientation of mantle fabric. We then couple the results from ASPECT to ECOMAN for modelling the radial anisotropy and maximum shear wave splitting direction. We show that in the part of the lowermost mantle surrounding the plume horizontally polarized shear waves (Vsh ) are faster than the vertically polarized ones (Vsv ) while the inside of the plume tail shows opposite signature. However, Vsh becomes greater than Vsv when the plume flattens out at the surface. We also find that the maximum splitting direction is horizontal outside the base of the plume and it becomes vertical inside the plume tail and again becomes horizontal at the surface. Moreover, our result for the slab setup reveals that as the slab reaches the lowermost mantle, Vsh becomes higher than Vsv and maximum splitting is horizontal at the base of the slab.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 6
    Electronic Resource
    Electronic Resource
    The Effect of Steam Activation on Multilayer Adsorption from Solution by Carbon (1953)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 57 (1953), S. 215-219 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150503a018
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  • 7
    Electronic Resource
    Electronic Resource
    The Adsorption of Aliphatic Alcohols and Acids from Aqueous Solutions by Non-porous Carbons (1954)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 58 (1954), S. 211-215 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150513a005
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  • 8
    Electronic Resource
    Electronic Resource
    Vibrationally resolved shape resonant photoionization of N2O (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1544-1550 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report a vibrationally resolved dispersed fluorescence study of 7σ−1 shape resonant photoionization in N2O. Previous work indicates that there are two shape resonances in the εσ channel, and our results demonstrate that the lower energy shape resonance (hνexc≈20 eV) results in non-Franck–Condon vibrational branching ratios over a wide range. Moreover, the cross section curves for alternative vibrational modes behave differently, and we show that the symmetric stretch exerts a greater influence on resonance behavior than the asymmetric stretching vibration. Such comparisons of vibrationally resolved partial cross section curves provide qualitative insights into the shape resonant photoionization dynamics for polyatomic targets. The higher energy shape resonance is apparently masked by the presence of the dominant nonresonant επ channel. In addition to information on the photoionization dynamics, these results also provide spectroscopic data on the ionic potential surfaces. Specifically, we obtain ratios of Franck–Condon factors for N2O+ (A→X) transitions which are useful for testing calculated properties of the ion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456097
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  • 9
    Electronic Resource
    Electronic Resource
    Autoionization dynamics in the valence-shell photoionization spectrum of CO (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 812-819 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Autoionizing Rydberg series in the valence-shell spectrum of CO have been studied by determining the high resolution relative photoionization cross section of cooled CO in the energy region 14.0–20.0 eV and by determining the vibrational branching ratios and the photoelectron angular distributions for production of CO+ X 2Σ+, v+=0–2 in the energy region 16.75–18.75 eV. Of particular interest are three prominent spectral features between 17.0 and 17.5 eV that result from interactions involving Rydberg series converging to the excited A 2Π and B 2Σ+ states of the ion. The results are discussed in the context of recent two-step multichannel quantum defect theory calculations by Leyh and Raseev (the following paper).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455204
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  • 10
    Electronic Resource
    Electronic Resource
    Vibronic coupling and other many-body effects in the 4σ−1g photoionization channel of CO2 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 949-956 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational branching ratios and photoelectron angular distributions were measured for 4σ−1g photoionization of CO2 in the energy range 20–28 eV. Of particular interest are three vibrational components of the resulting CO+2 C˜ 2Σ+g state—the allowed (000) and (100) bands and the forbidden (101) band. The wavelength dependence of the beta parameter for the forbidden band deviated significantly from that of the two allowed bands, showing instead a strong resemblance to that of the B˜ 2Σ+u state. This behavior suggests that vibronic coupling to the B˜ 2Σ+u state is responsible for the appearance of the forbidden (101) band in the C˜ 2Σ+g state photoelectron spectrum. We also observe evidence for other many-body effects—shape-resonance-induced continuum–continuum coupling and doubly excited autoionizing resonances—in the present data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459985
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