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  • Springer  (86,531)
  • American Geophysical Union (AGU)
  • Annual Reviews
  • 2015-2019  (81,707)
  • 1980-1984
  • 1935-1939  (5,758)
  • 2018  (81,707)
  • 1938  (5,758)
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  • 2015-2019  (81,707)
  • 1980-1984
  • 1935-1939  (5,758)
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  • 1
    Publication Date: 2020-10-13
    Description: Mount Etna is the highest relief in Sicily and represents a unique environment because of its long established and almost continuous eruptive activity, that has moulded its landforms and which has produced distinctive landscapes. Over the past 60 ka both destructive and constructive geological processes have produced the principal morphological features of the volcano such as the wide Valle del Bove depression, monogenic scoria cones and extensive lava flow fields. Relationships between Etna, its environment and human activity began in the Neolithic Period within the mountain foot region and have developed over millennia. Even though there has been a rapid rate of resurfacing by lava during historic times, the impact on human activity has been short-lived, recovery has been rapid and society has adjusted to the ever present hazard in distinctive ways.
    Description: Published
    Description: 467-478
    Description: 1V. Storia eruttiva
    Description: N/A or not JCR
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 2
    Publication Date: 2020-10-13
    Description: Volcanoes hold a fascination for human beings and, before they were recorded by literate observers, eruptions were portrayed in art, were recalled in legend and became incorporated into religious practices: being viewed as agents of punishment, bounty or intimidation depending upon their state of activity and the culture involved. In the Middle East the earliest record dates from the third millennium BCE and knowledge of volcanoes increased progressively over time. In the first century CE written records noted nine volcanoes in the Mediterranean region plus Mount Cameroon in West Africa, yet by 1380 AD the record only totalled 48, with volcanoes in Japan, Indonesia and Iceland being added. After this the list of continued to increase, but important regions such as New Zealand and Hawaii were only added during the last 200 years. Only from 1900 did the rate of growth decline significantly, but it is sobering to recall that in the twentieth century major eruptions have occurred from volcanoes that were considered inactive or extinct, examples including: Mount Lamington—Papua New Guinea, 1951; Mount Arenal—Costa Rica, 1968 and Nyos—Cameroon, 1986. Although there were instances where the human impact of historical eruptions were studied in detail, with examples including the 1883 eruption of Krakatau and 1943–1952 eruption of Parícutin, these were exceptions and before 1980 there was a significant knowledge gap about both the short and long-term effects of major eruptions on societies. Following a global review, this chapter provides a discussion of the ways in which information has been collected, compiled and disseminated from the earliest times until the 1980s in two case study areas: the Azores Islands (Portugal) and southern Italy. In Italy information on eruptions stretches back to prehistoric times and has become progressively better known over more than 2,000 years, yet even here there remain significant gaps in the record even for events that took place between 1900 and 1990. In contrast, located in the middle of the Atlantic, the Azores have been isolated for much of their history and illustrate the difficulties involved in using indigenous sources to compile, not only assessments of impact, but also at a more basic level a complete list of historical events with accurate dates.
    Description: Published
    Description: 1-25
    Description: 1V. Storia eruttiva
    Description: N/A or not JCR
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 3
    Publication Date: 2019-02-14
    Description: Mineral ballasting enhances carbon export from the surface to the deep ocean; however, little is known about the role of this process in the ice-covered Arctic Ocean. Here, we propose gypsum ballasting as a new mechanism that likely facilitated enhanced vertical carbon export from an under-ice phytoplankton bloom dominated by the haptophyte Phaeocystis. In the spring 2015 abundant gypsum crystals embedded in Phaeocystis aggregates were collected throughout the water column and on the sea floor at a depth below 2 km. Model predictions supported by isotopic signatures indicate that 2.7 g m−2 gypsum crystals were formed in sea ice at temperatures below −6.5°C and released into the water column during sea ice melting. Our finding indicates that sea ice derived (cryogenic) gypsum is stable enough to survive export to the deep ocean and serves as an effective ballast mineral. Our findings also suggest a potentially important and previously unknown role of Phaeocystis in deep carbon export due to cryogenic gypsum ballasting. The rapidly changing Arctic sea ice regime might favour this gypsum gravity chute with potential consequences for carbon export and food partitioning between pelagic and benthic ecosystems.
    Repository Name: EPIC Alfred Wegener Institut
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  • 4
    Publication Date: 2018-06-14
    Description: Sea-ice ecosystems are among the most extensive of Earth’s habitats; yet its autotrophic and heterotrophic activities remain poorly constrained. We employed the in situ aquatic eddy-covariance (AEC) O2 flux method and laboratory incubation techniques (H14CO3−, [3H] thymidine and [3H] leucine) to assess productivity in Arctic sea-ice using different methods, in conditions ranging from land-fast ice during winter, to pack ice within the central Arctic Ocean during summer. Laboratory tracer measurements resolved rates of bacterial C demand of 0.003–0.166 mmol C m−2 day−1 and primary productivity rates of 0.008–0.125 mmol C m−2 day−1 for the different ice floes. Pack ice in the central Arctic Ocean was overall net autotrophic (0.002–0.063 mmol C m−2 day−1), whereas winter land-fast ice was net heterotrophic (− 0.155 mmol C m−2 day−1). AEC measurements resolved an uptake of O2 by the bottom-ice environment, from ~ − 2 mmol O2 m−2 day−1 under winter land-fast ice to~ − 6 mmol O2 m−2 day−1 under summer pack ice. Flux of O2-deplete meltwater and changes in water flow velocity masked potential biological-mediated activity. AEC estimates of primary productivity were only possible at one study location. Here, productivity rates of 1.3 ± 0.9 mmol O2 m−2 day−1, much larger than concurrent laboratory tracer estimates (0.03 mmol C m−2 day−1), indicate that ice algal production and its importance within the marine Arctic could be underestimated using traditional approaches. Given careful flux interpretation and with further development, the AEC technique represents a promising new tool for assessing oxygen dynamics and sea-ice productivity in ice-covered regions.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
    Publication Date: 2018-11-12
    Description: The study investigates the in-situ strength of sediments across a plate boundary décollement using drilling parameters recorded when a 1180-m-deep borehole was established during International Ocean Discovery Program (IODP)Expedition 370, Temperature-Limit of the Deep Biosphere off Muroto (T-Limit). Information of the in-situ strength of the shallow portion in/around a plate boundary fault zone is critical for understanding the development of accretionary prisms and of the décollement itself. Studies using seismic reflection surveys and scientific ocean drillings have recently revealed the existence of high pore pressure zones around frontal accretionary prisms, which may reduce the effective strength of the sediments. A direct measurement of in-situ strength by experiments, however, has not been executed due to the difficulty in estimating in-situ stress conditions. In this study, we derived a depth profile for the in-situ strength of a frontal accretionary prism across a décollement from drilling parameters using the recently established equivalent strength (EST) method. At site C0023, the toe of the accretionary prism area off Cape Muroto, Japan, the EST gradually increases with depth but undergoes a sudden change at ~ 800 mbsf, corresponding to the top of the subducting sediment. At this depth, directly below the décollement zone, the EST decreases from ~ 10 to 2 MPa, with a change in the baseline. This mechanically weak zone in the subducting sediments extends over 250 m (~ 800–1050 mbsf), corresponding to the zone where the fluid influx was discovered, and high-fluid pressure was suggested by previous seismic imaging observations. Although the origin of the fluids or absolute values of the strength remain unclear, our investigations support previous studies suggesting that elevated pore pressure beneath the décollement weakens the subducting sediments.
    Repository Name: EPIC Alfred Wegener Institut
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  • 6
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    Springer
    In:  EPIC3Cham, Springer, 259 p., ISBN: 978-3-319-93284-2
    Publication Date: 2020-06-12
    Description: This open access book presents the proceedings volume of the YOUMARES 8 conference, which took place in Kiel, Germany, in September 2017, supported by the German Association for Marine Sciences (DGM). The YOUMARES conference series is entirely bottom-up organized by and for YOUng MARine RESearchers. Qualified early career scientists moderated the scientific sessions during the conference and provided literature reviews on aspects of their research field. These reviews and the presenters’ conference abstracts are compiled here. Thus, this book discusses highly topical fields of marine research and aims to act as a source of knowledge and inspiration for further reading and research.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Book , peerRev
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  • 7
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    Springer
    In:  EPIC3Handbook on Marine Environment Protection, Handbook on Marine Environment Protection, Berlin, Springer, 1024 p., pp. 463-485, ISBN: 978-3-319-60154-0
    Publication Date: 2018-07-23
    Description: Underwater sound is ubiquitous throughout the world’s oceans. Evaluating its impact and relevance for the marine fauna is highly complex and hampered by a paucity of data, lack of understanding and ambiguity of terms. When comparing sound (an energetic pollutant) with substantial pollutants (chemical, biological or marine litter) two notable differences emerge: Firstly, while sound propagates instantaneously away from the source, it also ceases immediately within minutes of shutting off the source. Anthropogenic noise is hence per-se ephemeral, lending itself to a set of in-situ mitigation strategies unsuitable for mitigation of persistent pollutants. Secondly, while pollution with hazardous substances can readily be described quantitatively with few parameters (environmental concentration as the most important one), the description of sound and its impact on aquatic life is of much higher complexity, as to be evidenced by the issues multifaceted description following hereinafter.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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  • 8
    Publication Date: 2019-04-11
    Description: This study forms part II of two papers describing ECHAM6-FESOM, a newly established global climate model with a unique multi-resolution sea ice-ocean component. While part I deals with the model description and the mean climate state, here we examine the internal climate variability of the model under constant present-day (1990) conditions. We (1) assess the internal variations in the model in terms of objective variability performance indices, (2) analyze variations in global mean surface temperature and put them in context to variations in the observed record, with particular emphasis on the recent warming slowdown, (3) analyze and validate the most common atmospheric and oceanic variability patterns, (4) diagnose the potential predictability of various climate indices, and (5) put the multi-resolution approach to the test by comparing two setups that differ only in oceanic resolution in the equatorial belt, where one ocean mesh keeps the coarse ~1° resolution applied in the adjacent open-ocean regions and the other mesh is gradually refined to ~0.25°. Objective variability performance indices show that, in the considered setups, ECHAM6-FESOM performs overall favourably compared to five well-established climate models. Internal variations of the global mean surface temperature in the model are consistent with observed fluctuations and suggest that the recent warming slowdown can be explained as a once-in-one-hundred-years event caused by internal climate variability; periods of strong cooling in the model (‘hiatus’ analogs) are mainly associated with ENSO-related variability and to a lesser degree also to PDO shifts, with the AMO playing a minor role. Common atmospheric and oceanic variability patterns are simulated largely consistent with their real counterparts. Typical deficits also found in other models at similar resolutions remain, in particular too weak non-seasonal variability of SSTs over large parts of the ocean and episodic periods of almost absent deep-water formation in the Labrador Sea, resulting in overestimated North Atlantic SST variability. Concerning the influence of locally (isotropically) increased resolution, the ENSO pattern and index statistics improve significantly with higher resolution around the equator, illustrating the potential of the novel unstructured-mesh method for global climate modeling.
    Repository Name: EPIC Alfred Wegener Institut
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  • 9
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    Springer
    In:  EPIC3Boundary Layer Meteorol., Springer, 166, pp. 301-325
    Publication Date: 2019-02-15
    Description: In climate and weather prediction models the near-surface turbulent fluxes of heat and momentum and related transfer coefficients are usually parametrized on the basis of Monin–Obukhov similarity theory (MOST). To avoid iteration, required for the numerical solution of the MOST equations, many models apply parametrizations of the transfer coefficients based on an approach relating these coefficients to the bulk Richardson number Rib.However, the parametrizations that are presently used in most climate models are valid only for weaker stability and larger surface roughnesses than those documented during the Surface Heat Budget of the Arctic Ocean campaign (SHEBA). The latter delivered a well-accepted set of turbulence data in the stable surface layer over polar sea-ice. Using stability functions based on the SHEBA data, we solve the MOST equations applying a new semi-analytic approach that results in transfer coefficients as a function of Rib and roughness lengths for momentum and heat. It is shown that the new coefficients reproduce the coefficients obtained by the numerical iterative method with a good accuracy in the most relevant range of stability and roughness lengths. For small Rib , the new bulk transfer coefficients are similar to the traditional coefficients, but for large Ri b they are much smaller than currently used coefficients. Finally, a possible adjustment of the latter and the implementation of the new proposed parametrizations in models are discussed.
    Repository Name: EPIC Alfred Wegener Institut
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  • 10
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    Springer
    In:  EPIC3Global Ecology and Oceanography of Harmful Algal Blooms, Global Ecology and Oceanography of Harmful Algal Blooms, Springer, 16 p., pp. 187-203, ISBN: 978-3-319-7006
    Publication Date: 2018-06-23
    Description: Coastal systems partially surrounded by land such as coastal embayments, estuaries and fjords have characteristics that affect the development of harmful algal blooms. Among these, shallow water depths and geophysical constraints from surrounding land masses favour stronger links between the water column and bottom sediments. Typical circulation patterns (e.g., in estuaries) can limit the exchange with offshore waters and favour cell retention. Sub-mesoscale and high-frequency processes are particularly important physical factors that influence pattern and persistence of HABs in coastal systems. Coupling with benthic nutrient fluxes or seed banks from the bottom is enhanced as the degree of physical robustness of coastal systems decreases. The links between bottom cyst distribution patterns and intensity or extension of HABs are still not fully understood. The importance of intra-specific diversity has been highlighted for many HAB species but tools are needed to assist in situ identification of these various life cycle stages. Alternative metabolic strategies, such as mixotrophy or reliance on organic nutrients and allelochemically mediated species interactions, can play a critical role in the development of HA blooms particularly in semi-confined coastal environments. Future work should address the influence of climate change and of coastal aquaculture on blooms of these harmful species in coastal environments.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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  • 11
    Publication Date: 2019-10-04
    Description: An integrative inventory of the amphipod scavenging fauna (Lysianassoidea), combining morphological identifications with DNA barcoding, is provided here for the Filchner area situated in the south-eastern Weddell Sea. Over 4400 lysianassoids were investigated for species richness and relative abundances, covering 20 different stations and using different sampling devices, including the southernmost baited traps deployed so far (76°S). High species richness was observed: 29 morphospecies of which 5 were new to science. Molecular species delimitation methods were carried out with 109 cytochrome c oxidase I gene (COI) sequences obtained during this study as well as sequences from specimens sampled in other Antarctic regions. These distance-based analyses (trees and the Automatic Barcode Gap Discovery method) indicated the presence of 42 lineages; for 4 species, several (cryptic) lineages were found. More than 96% of the lysianassoids collected with baited traps belonged to the species Orchomenella pinguides s. l. The diversity of the amphipod scavenger guild in this ice-bound ecosystem of the Weddell Sea is discussed in the light of bottom–up selective forces. In this southernmost part of the Weddell Sea, harbouring spawning and nursery grounds for silverfish and icefishes, abundant fish and mammalian food falls are likely to represent the major food for scavengers. Finally, the importance of biodiversity surveys in the context of the establishment of a marine protected area in this region (Weddell Sea MPA) is highlighted and how future studies can contribute to a better understanding the ecological role of scavengers in this system is discussed.
    Repository Name: EPIC Alfred Wegener Institut
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  • 12
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    Springer
    In:  EPIC3Handbook on Marine Environment Protection, Cham, Switzerland, Springer, 21 p., pp. 353-373, ISBN: 978-3-319-60156-4
    Publication Date: 2018-02-09
    Description: In this chapter, the effects of temperature change—as a main aspect of climate change—on marine biodiversity are assessed. Starting from a general discussion of species responses to temperature, the chapter presents how species respond to warming. These responses comprise adaptation and phenotypic plasticity as well as range shifts. The observed range shifts show more rapid shifts at the poleward range edge than at the equator-near edge, which probably reflects more rapid immigration than extinction in a warming world. A third avenue of changing biodiversity is change in species interactions, which can be altered by temporal and spatial shifts in interacting species. We then compare the potential changes in biodiversity to actual trends recently addressed in empirical synthesis work on local marine biodiversity, which lead to conceptual issues in quantifying the degree of biodiversity change. Finally we assess how climate change impacts the protection of marine environments.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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  • 13
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    In:  EPIC3Building Bridges at the Science-Stakeholder Interface, Building Bridges at the Science-Stakeholder Interface, Springer, 133 p., pp. 73-78, ISBN: 978-3-319-75919-7
    Publication Date: 2019-08-15
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev , info:eu-repo/semantics/other
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  • 14
    Publication Date: 2019-04-17
    Description: In fall 1995, during a survey in Abrolhos coral reef system (southwestern Atlantic, Brazil), significant densities (143–6174 cells L-1) of small thecate dinoflagellates were detected. Analysis of this material in scanning and transmission electron microscopy confirmed the presence of four taxa assigned to the potentially toxic genus Azadinium: A. dexteroporum Percopo et Zingone, A. luciferelloides Tillmann et Akselman, A. cf. polongum Tillmann and Azadinium sp. The latter taxon showed external morphological features quite distinct from any Azadinium taxon yet described, but its formal description as a new species depends on more detailed analysis. Species of Azadinium have never been confirmed in Brazilian waters until now, although the toxins produced by these dinoflagellates, the azaspiracids, have been detected in Brazilian southern coast without recognition of their producing organisms. The highest densities of Azadinium spp. occurred at stations south of and over the Abrolhos Bank, which receive higher nutrient concentrations due to upwelling of deep and nutrient-rich water masses.
    Repository Name: EPIC Alfred Wegener Institut
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  • 15
    Publication Date: 2018-06-27
    Description: This study focusses on the last glacial–deglacial–Holocene spatial and temporal variability in sea-ice cover based on organic geochemical analyses of marine sediment cores from the subarctic Pacific and the Bering Sea. By means of the sea-ice proxy “IP25” and phytoplankton-derived biomarkers (specific sterols and alkenones), we reconstruct the spring sea-ice conditions, (summer) sea-surface temperature (SST) and primary productivity, respectively. The large variability of sea ice was explained by a combination of local and global factors, such as solar insolation, global climate anomalies and sea-level changes controlling the oceanographic circulation and water mass exchange between the subarctic Pacific and the Bering Sea. During the Last Glacial Maximum, extensive sea-ice cover prevailed over large part of the subarctic Pacific and the Bering Sea. The following deglaciation is characterized by a rapid sea-ice advance and retreat. During cold periods (Heinrich Stadial 1 and Younger Dryas) seasonal sea-ice cover generally coincided with low alkenone SSTs and low primary productivity. Conversely, during warmer intervals (Bølling/Allerød, Early Holocene) reduced sea-ice or ice-free conditions prevailed in the study area. At the northern Bering Sea continental shelf a late-Early/Mid Holocene shift to marginal sea-ice conditions is in line with the simultaneous wide-spread sea-ice recovery observed in the other Arctic marginal seas and is likely initiated by the lower Northern Hemisphere insolation and surface-water cooling.
    Repository Name: EPIC Alfred Wegener Institut
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  • 16
    Publication Date: 2018-09-28
    Repository Name: EPIC Alfred Wegener Institut
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  • 17
    Publication Date: 2021-04-25
    Keywords: 551 ; VKB 350 ; 38.20
    Language: English
    Type: anthologyArticle , publishedVersion
    Format: 186-209
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  • 18
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    Springer | Berlin [u.a.]
    Publication Date: 2021-04-25
    Description: Colonial non-zooxanthellate corals from deep-water coral reefs, Lophelia pertusa and Madrepora oculata, produce large amounts of extracellular mucus (EMS). This mucus has various functions, e.g., an antifouling capability protecting the coral skeleton from attacks of endolithic and boring organisms. Both corals show thick epithecal and exothecal skeletal parts with a clear lamellar growth pattern. The formation of the epitheca is unclear. It is supposed that the EMS play a central role during the calcification process of the epithecal skeletal parts. Staining with the fluorochrome tetracycline has shown an enrichment of Ca2+ ions in the mucus. In order to investigate this hypothesis, the protein content of the mucus and the intracrystalline organic matter from newly formed epithecal aragonite of Madrepora oculata was determined via sodium dodecyl sulfate (SDS) gel electrophoresis. Identical band patterns within both substances could be detected, one around 45 kDa molecular weight and a cluster around 30-35 kDa molecular weight. The occurrence of identical protein patterns within the mucus and in the newly formed aragonite confirms the idea that the mucus plays an important role during the organomineralization of the coral epitheca.
    Keywords: 551 ; VU 000 ; 38.20
    Language: English
    Type: anthologyArticle , publishedVersion
    Format: 731-744
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  • 19
    Publication Date: 2021-03-29
    Description: The incorporation of hydrogen in enstatite in a hydrous system containing various amounts of NaCl was investigated at 25 kbar. The hydrogen content in enstatite shows a clear negative correlation to the NaCl-concentration in the system. The most favourable explanation is the reduction of water fugacity due to dilution. Other reasons for the limited hydrogen incorporation at high NaCl levels, such as a significant influence of Na+ on the defect chemistry or an exchange between OH- and Cl-in enstatite, appear much less important. A partition coefficient D Na En/Fluid = 0.0013 could be determined, demonstrating that Na is less incompatible in enstatite than H. The new results support the idea that dissolved components have to be considered when the total hydrogen storage capacity in nominally anhydrous minerals is estimated, especially in geological settings with high levels of halogens, such as subduction zones.
    Keywords: KEnstatite; Hydrogen incorporation;Water activity; Sodium; Chlorine ; 551
    Language: English
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  • 20
    Publication Date: 2021-03-29
    Description: The coprecipitation of U (VI) with iron corrosion products from aqueous solutions by zero valent iron was investigated. The evidence of coprecipitation was demonstrated by conducting experiments with well characterized scrap iron,pyrite and a mixture of both materials with experimental durations of up to four months. Results indicate that under anoxic conditions only less than one tenth of the immobilized U(VI) was associated with the surface of scrap iron, whereas theremaining amount is entrapped in aging corrosion products.
    Keywords: 551
    Language: English
    Type: anthologyArticle , acceptedVersion
    Format: 577-586
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  • 21
    Publication Date: 2018-03-08
    Description: This contribution proposes a cautious way of constructing the susceptibility classes obtained from favourability modeling of landslide occurrences. It is based on the ranks of the numerical values obtained by the modelling. Such ranks can be displayed in the form of histograms, cumulative curves, and prediction patterns resembling maps. A number of models have been proposed and in this contribution the following will be compared in terms of their respective rankings for equal area classes: fuzzy set function, empirical likelihood ratio, linear and logistic regression, and Bayesian prediction function. The analyses performed and contrasted exemplify a generalized methodology for comparing predictions that should allow evaluating prediction patterns from any model. Unfortunately, many applications in the scientific literature use methods of characterizing prediction quality that make comparison hard or impossible. A database from a study area in the Mountain Community of Tirano in Valtellina, Lombardy Region, northern Italy, is used to illustrate how the results of the different models and strategies of analysis show the relevance of the properties of the database over those of the models.
    Description: Published
    Description: 1135-1144
    Description: 2TR. Ricostruzione e modellazione della struttura crostale
    Keywords: Landslide susceptibility, spatial support, spatial relationships, prediction models, prediction patterns, target pattern, ranked classes, cross-validation, database signature ; 04.04. Geology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 22
    Publication Date: 2018-04-06
    Description: The EOS-1 Terra ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) has acquired about 200 images (100 of them sufficiently cloud-free to be used) over Mt. Etna since 1999. This chapter shows the results from the analysis of 10 years Mt Etna activity using thermal infrared (TIR) high spatial resolution data by a semi-automatic procedure that extracts radiance values of the summit area with the goal of detecting variation related to eruptive events. Night time data showed a good correlation with the main eruptive events that occurred both in the summit and in the flank areas. A comparison of the variance of maximum ASTER TIR radiance with variance of the maximum AVHRR TIR radiance (Advanced Very High Resolution Radiometer) for the same area confirms good correlation in terms of trend and values between the two data sets. Finally this study emphasizes the importance of high spatial resolution TIR data during background monitoring to detect changes in the thermal emission that may be related to an impending eruption and the need to further improve the spatial resolution in the TIR channels to better separate the thermal active areas in volcanic systems.
    Description: Published
    Description: 409-428
    Description: 5V. Dinamica dei processi eruttivi e post-eruttivi
    Description: 2SR. VULCANI - Servizi e ricerca per la Società
    Description: 5IT. Osservatori
    Keywords: Remote sensing observation, volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 23
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    Springer
    Publication Date: 2018-02-16
    Description: No abstract
    Description: Published
    Description: 6A. Geochimica per l'ambiente
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 24
    Publication Date: 2018-02-19
    Description: No abstract
    Description: Published
    Description: 6A. Geochimica per l'ambiente
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 25
    Publication Date: 2018-03-16
    Description: In this paper, we analyze the tropospheric delay observed on some ground-based CGPS stations in a dense small regional network and its time evolution during extreme weather conditions. In particular, we studied two severe weather events occurring in the Campanian Region (Italy) on October 12, 2012 and December 2, 2014, reaching 42 and 28 mm rainfall during about 1 h at Naples (MAFE) and Gragnano (GRAG) stations respectively. The main concern of this study is the retrieval of the precipitable water (PW) from co-located GPS and meteorological stations. We investigate the correlation between PW and rain amount at ground level. We analyse phase residuals for each visible GPS satellite using sky plots of the phase residuals along the GPS satellites tracks, showing that the two phenomena are shown in the phase residual plots. Moreover, we compare PWdata retrieved from observed meteorological data and from models (GPT2 and ECMWF), evidencing that there is a need for co-located CGPS and weather stations to improve the assessment of water content in the troposphere.
    Description: Published
    Description: 293-302
    Description: 4A. Oceanografia e clima
    Description: 7A. Geofisica per il monitoraggio ambientale e geologia medica
    Keywords: Precipitable water ; Tropospheric delay ; GPT2 ; ECMWF ; GPS ; 01.01. Atmosphere
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 26
    Publication Date: 2018-03-19
    Description: The importance of historical earthquake data is largely recognized by both seismologists and engineers, who use such data in a wide range of applications. At the European-Mediterranean scale, several databases dealing with historical earthquake data – mostly intensity data points – exist and are constantly maintained and updated, as well as national earthquake catalogues. In addition, a number of studies on historical earthquakes are published every year. Most of these activities are being performed at a national scale, depending on each country’s needs, and according to diverse methodologies. As a result, the earthquake history of Europe is today fragmented in a puzzle of different, only partially overlapping sets of data, which, at the continent scale, are not homogeneously collected and interpreted. This situation is particularly evident in the frontier areas, where historical earthquakes are often interpreted in a conflicting and/or partial way by the catalogues of the bordering countries. In addition, the background information upon which several historical catalogues are built is not published or not easily accessible. In recent years, a major effort was made to bridge over these gaps, by establishing cooperation among existing national databases, and creating new ones according to common standards. Particular attention was devoted to retrieve the earthquake background information, that is, the results of historical earthquake investigation in terms of a paper, a report, a book chapter, a map, etc. As most of the information on an historical earthquake can be summarized in a set of Macroseismic Data Points (MDPs) – i.e. a list of localities (name and coordinates) with a macroseismic intensity assessment and the related macroseismic scale – a dedicated effort was addressed to make such data publicly available. The described activities resulted in the European Archive of Historical Earthquake Data (AHEAD). The Archive is conceived as a pan-European common and open platform supporting the research activities in the field of historical seismology by (i) tracing back, preserving and granting access to the sources of data on the earthquake history of Europe (papers, reports, MDPs, and catalogues), and (ii) establishing relations among these data. AHEAD inventories multiple sets of information concerning each European earthquake in the time-window 1000–1899. The AHEAD web portal (http://www.emidius.eu/AHEAD/) gives access, as of today, to 4,722 earthquakes and the related background information as provided by 338 data sources. All these data can be queried by earthquake and by study, through a user-friendly web-interface. The distinguishing feature of AHEAD is to grant access not only to one study, but to all the available (published) data sources dealing with each individual earthquake, allowing researchers to take into account the different point of views and interpretations.
    Description: Published
    Description: 359-369
    Description: 3T. Storia Sismica
    Description: 4T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: 4IT. Banche dati
    Keywords: historical seismology ; seismicity ; historical earthquakes ; 04.06. Seismology ; 05.02. Data dissemination
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 27
    Publication Date: 2019-03-26
    Description: The shallow vertical temperature profile has been measured in the proximity of an eruptive fissure far about 4 km north-northeast from Mt. Etna central craters. The monitoring site was a steam-heated soil lying between a group of flank fractures on the upper northeast flank of Mt. Etna (Italy), i.e., on the northeast rift. We chose this area because it was close to an eruptive fissure, that opened in 2002 and extended from about 2500 to about 1500 m a.s.l., with our aim being to determine a connection between this fracture system and the ongoing volcanic activity. Heat flux anomalies from the ground from September 2009 to September 2012 were evaluated. Changes in the hydrothermal release—which can be related to variations in volcanic activity—are discussed and compared to the published geophysical data. The heat flux ranges varied during the pre-eruptive (from about 7 to 38 W×m−2), syn-eruptive (from about 3 to 49W×m−2), and post-eruptive phases, with the heat released being lowest at the latter phase (from about 1 to 20 W×m−2). Moreover, the heat flux time variation was strongly correlated with the eruption rate from the new southeast crater between January 2011 and April 2012. The migration of magma through active conduits acts as a changing heating source for steam-heated soils located above the active fractures. Our findings suggest that tracking the heat flux above active fractures constitutes a useful investigation field for low-cost thermal monitoring of volcanic activity. Time variations in their emissions could highlight the relationship between a hydrothermal circuit and the local network of fractures, possibly indicating variation in the structural weakness of a volcanic edifice. Continuous monitoring of heat flux, combined with a realistic model, would contribute to multidisciplinary investigations aimed at evaluating changes in volcano dynamics.
    Description: National Department of Civil Protection
    Description: Published
    Description: 31
    Description: 5V. Processi eruttivi e post-eruttivi
    Description: JCR Journal
    Keywords: Volcanic activity ; Ground temperature ; Heat flux ; Continuous monitoring ; 04.08. Volcanology ; 05.04. Instrumentation and techniques of general interest
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 28
    Publication Date: 2021-03-29
    Description: Five volcanic tuffs ranging from dacitic tuffs of Hungary to rhyolite, phonolite and basaltic tuffs of Germany were consolidated under laboratory conditions. Prior to consolidation an anti-hygro, a hydrous consolidant, which reduces the swelling ability of clay minerals, was applied. The three consolidants, a silicic acid ester (SAE), an elastic silicic acid ester (eSAE) and an acrylate resin (PMMA) were applied on test specimens under vacuum. Petrographic characterisation (polarizing microscopy, XRD, SEM) provided data for fabric analyses and the mineral composition of the tuffs. Changes in fabric, effective porosity, density, tensile strength, ultrasonic wave velocity were evaluated after the treatment. Weathering simulation tests such as hygric dilatation and thermal dilatation aimed to prove the effectiveness of consolidation and the durability of consolidated tuff samples. More than 500 samples were analysed. The tests showed that SAE caused the highest increase in indirect tensile strength. The water absorption and the pore size distribution of the tuffs were modified by consolidation. The PMMA reduced the water absorption the most, whereas SAE modified it the least. All the tested consolidants increased the thermal dilatation of the tuffs. The changes in hygric dilatation were not uniform: for most tuffs SAE increased and PMMA decreased the hygric dilatation, although the clay-rich Habichtswald tuff showed the opposite trend. The changes in hygric and thermal behaviour of consolidated tuff require special care when specific consolidants are chosen. These products modify the physical properties of consolidated tuffs and change the behaviour of weathering.
    Keywords: Strengthening agents; Tuff; Silicic acid ester; PMMA; Durability ; 551
    Language: English
    Type: article , publishedVersion
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  • 29
    Publication Date: 2021-03-29
    Keywords: Albrecht-von-Haller-Institut für Pflanzenwissenschaften / Abteilung für Palynologie und Klimadynamik ; Palaeolimnology; Holocene climate; Diatoms; Green algae; Pollen; Karst ; 551
    Language: English
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  • 30
    Publication Date: 2021-03-29
    Description: A 782 d solubilization study using not shaken batch experiments and involving one uranium-bearing rock and three natural carbonate minerals was conducted to characterize uranium (U) leaching under oxic conditions. Results showed that aqueous U concentration increased continuously with a solubilization rate of 0.16 mgm-2h-1 for the first 564 d (1.5 y). After 1.5 y, U concentration reached a maximum value (saturation) and decreased afterwards. The saturation concentration of 54 mgL-1 (mean value) was influenced to various extent by the presence of carbonate minerals. Dissolution/precipitation, adsorption or ion exchange processes appear to control U solubilization.
    Keywords: 551
    Language: English
    Type: anthologyArticle , acceptedVersion
    Format: 425-435
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  • 31
    Publication Date: 2021-04-25
    Keywords: 551 ; VU 000 ; 38.20
    Language: English
    Type: anthologyArticle , publishedVersion
    Format: 179-211
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  • 32
    Publication Date: 2021-04-25
    Keywords: 551 ; VU 000 ; 38.20
    Language: English
    Type: anthologyArticle , publishedVersion
    Format: 102-120
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  • 33
    Publication Date: 2021-04-25
    Keywords: 551 ; VU 000 ; 38.20
    Language: English
    Type: anthologyArticle , publishedVersion
    Format: 121-133
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  • 34
    Publication Date: 2021-03-29
    Description: The veneer cladding of the Oeconomicum (OEC, Göttingen), the State Theatre of Darmstadt (STD, Darmstadt) and of the State and University Library (SUB, Göttingen) is characterised by pronounced bowing after a short time of exposure. Direct comparison of bowing data related to measurements from 2000 to 2003 at the SUB clearly show that the amplitude in bowing had significantly increased. The bowing is different in intensity and orientation (concave, convex). The cladding material (Peccia marble, Rosa Estremoz marble and Carrara marble) are different in lattice preferred orientation, grain size distribution and grain interlocking. Depending on the bowing, panels may show cracks mostly initiated at the dowels. The percentage of visible cracks and breakouts increases with the amplitude of bowing except for the STD. Repetitive heatingcooling under dry conditions leads to considerable inelastic residual strain only after the first or second thermal cycle. The residual strain continuously increases again if water is present, whereby the moisture content after a thermal cycle has a certain impact on the decay rate. The water-enhanced thermal dilatation strongly correlates with the deterioration rate obtained from the laboratory bow test. Detailed petrophysical investigations provide evidence that with increasing bowing a decrease of mechanical properties (flexural strength or breaking load at dowel hole) occur. Marble degradation is also connected with the increase in porosity and a general shift of the maximum pore radii to larger pore sizes...
    Keywords: Bowing; Marble; Building mapping;Residual strain;Thermal expansion; Bowing potential ; 551
    Language: English
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  • 35
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    In:  EPIC3Ocean Dynamics, Springer, pp. 1-17
    Publication Date: 2019-01-23
    Description: Mesoscale eddies in the open ocean are mostly formed by baroclinic instability, in which the available potential energy from the large-scale slope of the isopycnals is converted into the kinetic energy of the flow around the eddy. As a permissible form of motion within a rapidly rotating and stratified fluid eddies driven by baroclinic instability are important for the poleward and vertical transport, not only of physical properties, but also biogeochemical ones. In this paper, we present observations from four cyclonic eddies in the Antarctic Circumpolar Current. We have sorted them by apparent age, based on altimeter data and consideration of the degree of homogenisation of the potential temperature-salinity(θS) relationship, and then looked at the spatial distribution of measures of fine-scale variability in the upper thermocline. The youngest eddy shows isopycnals which are domed upwards and it contains a variety of waters with differing temperature-salinity characteristics. The fine-scale variability is higher in the core of the eddy. The older eddies show a core which is more homogeneous in potential temperature and salinity. The isopycnals are flatter in the centre of the eddy, and in cross-section, they can be M-shaped, so that the steepest gradients are concentrated around the edge. The fine-scale variability is more concentrated around the edges where the density gradients are stronger. We hypothesise that lateral stirring and mixing processes within the eddy homogenise the water so that the temperature-salinity relationship becomes tighter. When the eddy eventually collapses, this modified water can be released back into the flow. Thus, we see how the interplay of mesoscale and small-scale processes are modifying water mass properties and, potentially, regulate biogeochemical processes.
    Repository Name: EPIC Alfred Wegener Institut
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  • 36
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    In:  EPIC3YOUMARES 8 - Ocean across boundaries: Learning from each other, Kiel, Germany, 2017-09-13-2017-09-15Cham, Springer
    Publication Date: 2019-09-13
    Repository Name: EPIC Alfred Wegener Institut
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  • 37
    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 Population Ecology 60 (2018): 21-36, doi:10.1007/s10144-018-0615-8.
    Description: Models of sexually-reproducing populations that consider only a single sex cannot capture the effects of sex-specific demographic differences and mate availability. We present a new framework for two-sex demographic models that implements and extends the birth-matrix mating-rule approach of Pollak. The model is a continuous-time matrix model that explicitly includes the processes of mating (which is nonlinear but homogeneous), offspring production, and demographic transitions and survival. The resulting nonlinear model converges to exponential growth with an equilibrium population composition. The model can incorporate age- or stage-structured life histories and flexible mating functions. As an example, we apply the model to analyze the effects of mating strategies (polygamy or monogamy, and mated unions composed of males and females, of variable duration) on the response to sex-biased harvesting. The combination of demographic complexity with the interaction of the sexes can have major population dynamic effects and can change the outcome of evolution on sex-related characters.
    Description: This work was supported by a National Science Foundation Graduate Research Fellowship to ES, under Grant 1122374. HC acknowledges support from NSF Grants DEB1145017 and DEB1257545 and support from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013), ERC Advanced Grant 322989. ES acknowledges support from the Academic Programs office of the Woods Hole Oceanographic Institution.
    Keywords: Birth matrix-mating rule ; BMMR ; Demography ; Matrix population models ; Sex-biased harvest ; Two-sex models
    Repository Name: Woods Hole Open Access Server
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  • 38
    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 Progress in Earth and Planetary Science 5 (2018): 19, doi:10.1186/s40645-018-0167-8.
    Description: The Quaternary hemipelagic sediments of the Japan Sea are characterized by centimeter- to decimeter-scale alternation of dark and light clay to silty clay, which are bio-siliceous and/or bio-calcareous to a various degree. Each of the dark and light layers are considered as deposited synchronously throughout the deeper (〉 500 m) part of the sea. However, attempts for correlation and age estimation of individual layers are limited to the upper few tens of meters. In addition, the exact timing of the depositional onset of these dark and light layers and its synchronicity throughout the deeper part of the sea have not been explored previously, although the onset timing was roughly estimated as ~ 1.5 Ma based on the result of Ocean Drilling Program legs 127/128. Consequently, it is not certain exactly when their deposition started, whether deposition of dark and light layers was synchronous and whether they are correlatable also in the earlier part of their depositional history. The Quaternary hemipelagic sediments of the Japan Sea were drilled at seven sites during Integrated Ocean Drilling Program Expedition 346 in 2013. Alternation of dark and light layers was recovered at six sites whose water depths are 〉 ~ 900 m, and continuous composite columns were constructed at each site. Here, we report our effort to correlate individual dark layers and estimate their ages based on a newly constructed age model at Site U1424 using the best available paleomagnetic datum and marker tephras. The age model is further tuned to LR04 δ18O curve using gamma ray attenuation density (GRA) since it reflects diatom contents that are higher during interglacial high-stands. The constructed age model for Site U1424 is projected to other sites using correlation of dark layers to form a high-resolution and high-precision paleo-observatory network that allows to reconstruct changes in material fluxes with high spatio-temporal resolutions.
    Description: This work was supported by a grant from IODP Exp. 346 After Cruise Research Program, JAMSTEC, awarded to TR, IK, Irino T, Itaki T, ST, KY, SS, and KA and from JSPS KAKENHI grant number 16H01765 awarded to TR.
    Keywords: Quaternary sediments ; Japan Sea ; Inter-site correlation ; High-resolution age model ; IODP ; Expedition 346 ; U1424 ; U1425 ; U1426 ; U1430
    Repository Name: Woods Hole Open Access Server
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  • 39
    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 Progress in Earth and Planetary Science 5 (2018): 74, doi:10.1186/s40645-018-0232-3.
    Description: South Chamorro Seamount (SCS) is a blueschist-bearing serpentinite mud volcano in the Mariana forearc. Previous scientific drilling conducted at SCS revealed highly alkaline, sulfate-rich formation fluids resulting from slab-derived fluid upwelling combined with serpentinization both beneath and within the seamount. In the present study, a time-series of ROV dives spanning 1000 days was conducted to collect discharging alkaline fluids from the cased Ocean Drilling Program (ODP) Hole 1200C (hereafter the CORK fluid). The CORK fluids were analyzed for chemical compositions (including dissolved gas) and microbial community composition/function. Compared to the ODP porewater, the CORK fluids were generally identical in concentration of major ions, with the exception of significant sulfate depletion and enrichment in sulfide, alkalinity, and methane. Microbiological analyses of the CORK fluids revealed little biomass and functional activity, despite habitable temperature conditions. The post-drilling sulfate depletion is likely attributable to sulfate reduction coupled with oxidation of methane (and hydrogen), probably triggered by the drilling and casing operations. Multiple lines of evidence suggest that abiotic organic synthesis associated with serpentinization is the most plausible source of the abundant methane in the CORK fluid. The SCS formation fluid regime presented here may represent the first example on Earth where abiotic syntheses are conspicuous with little biotic processes, despite a condition with sufficient bioavailable energy potentials and temperatures within the habitable range.
    Description: This work was partly supported by JSPS KAKENHI Grant Number 25701004 (SK).
    Keywords: Forearc serpentinite mud volcano ; South Chamorro Seamount ; Limit of biosphere ; Present-days’ chemical evolution ; Radio-isotope-tracer carbon assimilation estimation
    Repository Name: Woods Hole Open Access Server
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  • 40
    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 Journal of the History of Biology 51 (2018): 693–805, doi:10.1007/s10739-018-9538-7.
    Description: The Bermuda Principles for DNA sequence data sharing are an enduring legacy of the Human Genome Project (HGP). They were adopted by the HGP at a strategy meeting in Bermuda in February of 1996 and implemented in formal policies by early 1998, mandating daily release of HGP-funded DNA sequences into the public domain. The idea of daily sharing, we argue, emanated directly from strategies for large, goal-directed molecular biology projects first tested within the “community” of C. elegans researchers, and were introduced and defended for the HGP by the nematode biologists John Sulston and Robert Waterston. In the C. elegans community, and subsequently in the HGP, daily sharing served the pragmatic goals of quality control and project coordination. Yet in the HGP human genome, we also argue, the Bermuda Principles addressed concerns about gene patents impeding scientific advancement, and were aspirational and flexible in implementation and justification. They endured as an archetype for how rapid data sharing could be realized and rationalized, and permitted adaptation to the needs of various scientific communities. Yet in addition to the support of Sulston and Waterston, their adoption also depended on the clout of administrators at the US National Institutes of Health (NIH) and the UK nonprofit charity the Wellcome Trust, which together funded 90% of the HGP human sequencing effort. The other nations wishing to remain in the HGP consortium had to accommodate to the Bermuda Principles, requiring exceptions from incompatible existing or pending data access policies for publicly funded research in Germany, Japan, and France. We begin this story in 1963, with the biologist Sydney Brenner’s proposal for a nematode research program at the Laboratory of Molecular Biology (LMB) at the University of Cambridge. We continue through 2003, with the completion of the HGP human reference genome, and conclude with observations about policy and the historiography of molecular biology.
    Repository Name: Woods Hole Open Access Server
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  • 41
    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 Climate Dynamics 51 (2018): 3275–3289, doi:10.1007/s00382-018-4078-6.
    Description: The atmospheric jet and blocking distributions, especially in the North Atlantic sector, have been challenging features for a climate model to realistically reproduce. This study examines climatological distributions of winter (December–February) daily jet latitude and blocking in the North Atlantic from the 40-member Community Earth System Model version 1 Large Ensemble (CESM1LE) simulations. This analysis aims at examining whether a broad range of internal climate variability encompassed by a large ensemble of simulations results in an improved representation of the jet latitude distributions and blocking days in CESM1LE. In the historical runs (1951–2005), the daily zonal wind at 850 hPa exhibits three distinct preferred latitudes for the eddy-driven jet position as seen in the reanalysis datasets, which represents a significant improvement from the previous version of the same model. However, the meridional separations between the three jet latitudes are much smaller than those in the reanalyses. In particular, the jet rarely migrates to the observed southernmost position around 37°N. This leads to the bias in blocking frequency that is too low over Greenland and too high over the Azores. These features are shown to be remarkably stable across the 40 ensemble members with negligible member-to-member spread. This result implies the range of internal variability of winter jet latitude and blocking frequency within the 55-year segment from each ensemble member is comparable to that represented by the full large ensemble. Comparison with 2046–2100 from the RCP8.5 future projection runs suggests that the daily jet position is projected to maintain the same three preferred latitudes, with a slightly higher frequency of occurrence over the central latitude around 50°N, instead of shifting poleward in the future as documented in some previous studies. In addition, the daily jet speed is projected not to change significantly between 1951–2005 and 2046–2100. On the other hand, the climatological mean jet is projected to become slightly more elongated and stronger on its southern flank, and the blocking frequency over the Azores is projected to decrease.
    Description: Authors gratefully acknowledge support from the UCAR Significant Opportunities in Atmospheric Research and Science (SOARS) and WHOI Summer Student Fellowship programs. AC and CM were supported in part by the SOARS program, NSF Grant AGS- 1120459. In addition, the supports by the NSF AGS Climate and Largescale Dynamics program and OCE Physical Oceanography program (AGS-1355339) to Y-OK and HS, the DOE BER Regional and Global Climate Modeling program (DE-SC0014433) to Y-OK, and the NSF EaSM3 Sustainability Research Networks program (OCE-1419235) to HS are acknowledged.
    Repository Name: Woods Hole Open Access Server
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  • 42
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    In:  EPIC3YOUMARES 8 – Oceans Across Boundaries: Learning from each other, YOUMARES 8 – Oceans Across Boundaries: Learning from each other, Cham, Springer, 6 p., pp. 1-6, ISBN: 978-3-319-93284-2
    Publication Date: 2020-06-12
    Description: YOUMARES is an annual early-career scientist conference series. It is an initiative of the German Society for Marine Research (DGM) and takes place in changing cities of northern Germany. The conference series is organized in a bottom-up structure: from and for YOUng MARine RESearchers. In this chapter, we describe the concept of YOUMARES together with its historical development from a single-person initiative to a conference venue of about 200 participants. Furthermore, the three authors added some personals experiences and insights, what YOUMARES means to them.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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  • 43
    Publication Date: 2022-05-24
    Description: Is Europe-wide operational earthquake forecasting (OEF) possible? We discuss the myriad problems that prevent it today, many of which relate to heterogeneities in earthquake recording, processing, and reporting. We contemplate the difficulty of building models that cross political boundaries, and we consider the prospect of European OEF in light of recent efforts to harmonize long-term seismic hazard assessment among several nations. Emphasizing the Strategies and Tools for Real-time Earthquake Risk Reduction (REAKT) project, we report achievements related to short-term seismicity forecasting in Iceland and Italy that could apply elsewhere in Europe. In Iceland, collaboration fostered by REAKT resulted in a revised earthquake catalog and a prototype OEF system. We report results from an experiment conducted with this prototype; these results suggest ensemble models provide an information gain, updating models more frequently improves their forecast skill, and that OEF is computationally feasible. In Italy, REAKT supported the creation of an ensemble model that now issues weekly hazard forecasts. We present examples of these forecasts, highlighting the problem that OEF often yields low probabilities, which are difficult to interpret and convert into actionable decisions. Motivated by such low hazard probabilities, we highlight Europe’s pioneering efforts in operational earthquake loss forecasting and mention solutions to problems that currently prevent OEF at the European scale.
    Description: Published
    Description: 2459-2469
    Description: 5T. Modelli di pericolosità sismica e da maremoto
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 44
    Publication Date: 2022-05-24
    Description: Investigating relationships between macroseismic intensity and strong-motion data requires the existence of these two records for the same seismic event and site. In Italy, this comparison is feasible through the cross-matching of the Italian Macroseismic Database (DBMI) and the Italian Strong-Motion Database (ITACA) which are the most comprehensive sources of both data. However, the two databases lack a direct link which would allow performing joint analysis of macroseismic data points and strong-motion recordings, making the comparison a time consuming job for the researcher. This paper demonstrates the usefulness of cross-database identifiers, and presents their use in a webtool called Rosetta, an initial proof-of-concept that helped testing linking procedures among DBMI and ITACA, and user friendly visual solutions. The development allowed the working group to exchange expertise on their respective database structures and workflows, laying the groundwork for a consistent, low-maintenance, and durable solution that will be easily updatable each time a new version of DBMI or ITACA will be released.
    Description: Italian Department of Civil Protection to the project INGV-DPC S2-2014 “Constraining Observations into Seismic Hazard”
    Description: Published
    Description: 2429–2443
    Description: 3T. Storia Sismica
    Description: 4T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: 4IT. Banche dati
    Description: JCR Journal
    Keywords: seismology ; macroseismic intensity ; strong-motion ; stations ; historical earthquakes ; database ; identifiers ; 04.06. Seismology ; 05.02. Data dissemination
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  • 45
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    In:  EPIC3YOUMARES 8--Oceans Across Boundaries: Learning from each other, Springer, ISBN: 978-3-319-93284-2
    Publication Date: 2022-07-18
    Description: The Earth’s climate is changing and the poles are particularly sensitive to the global warming, with most evident implications over the Arctic. While summer sea ice reduced significantly compared to the previous decades, and the atmospheric warming is amplified over the Arctic, changes in the ocean are less obvious due to its higher inertia. Still, impacts of the changing climate on high-latitude and polar oceans are already observable and expected to further increase. The northern seas are essential regions for the maintenance of the Atlantic Meridional Overturning Circulation, which in turn is a key aspect of the maritime climate. Alterations in heat and freshwater/salinity content in the Arctic Ocean and adjacent seas impact and are closely linked to buoyancy flux distributions, which control the vertical and horizontal motion of water masses, thus impacting the climate system on a longer time scale. In this context, we set our focus on the Arctic Ocean and Atlantic subarctic seas, review some of the contemporary knowledge and speculations on the complex coupling between atmosphere, sea ice, and ocean, and describe the important elements of its physical oceanography. This assessment is an attempt to raise awareness that investigating the pathways and timescales of oceanic responses and contributions is fundamental to better understand the current climate change.
    Repository Name: EPIC Alfred Wegener Institut
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  • 46
    Publication Date: 2022-05-26
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Aquatic Sciences 80 (2018): 44, doi:10.1007/s00027-018-0594-z.
    Description: Complex natural systems are affected by multiple anthropogenic stressors, and therefore indirect effects within food webs are increasingly investigated. In this context, dead organic matter (OM) or detritus provides a food source sustaining detrital food webs that recycle the retained energy through microbial decomposition and invertebrate consumption. In aquatic environments, poorly water-soluble contaminants, including nanoparticles (NPs), quickly adsorb onto OM potentially modifying OM-associated microbial communities. Since invertebrates often depend on microbial conditioning to enhance OM quality, adverse effects on OM-associated microbial communities could potentially affect invertebrate performances. Therefore, this study assessed the effect of environmentally relevant concentrations of the model emerging contaminant, silver nanoparticles (AgNPs), on OM-associated microorganisms and subsequent indirect effects on growth of the invertebrate Asellus aquaticus. At low concentrations (0.8 ug/L), AgNPs inhibited activity and altered metabolic diversity of the OM-associated microbial community. This was observed to coincide with a negative effect on the growth of A. aquaticus due to antimicrobial properties, as a decreased growth was observed when offered AgNP-contaminated OM. When A. aquaticus were offered sterile OM in the absence of AgNPs, invertebrate growth was observed to be strongly retarded, illustrating the importance of microorganisms in the diet of this aquatic invertebrate. This outcome thus hints that environmentally relevant concentrations of AgNPs can indirectly affect the growth of aquatic invertebrates by affecting OM-associated microbial communities, and hence that microorganisms are an essential link in understanding bottom-up directed effects of chemical stressors in food webs.
    Description: The Chinese Scholarship Council (CSC) is gratefully acknowledged for its financial support to Yujia Zhai [201506510003]. Martina G. Vijver is funded by NWO-VIDI [project number 864.13.010].
    Keywords: Asellus aquaticus ; Food web ; Freshwater biofilms ; Decomposition and consumption ; Silver nanoparticles ; Ecosystem functioning
    Repository Name: Woods Hole Open Access Server
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  • 47
    Publication Date: 2022-05-26
    Description: © The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Climate Dynamics 50 (2018): 1291–1305, doi:10.1007/s00382-017-3685-y.
    Description: The role of the oceanic water cycle in the record-breaking 2015 warm-season precipitation in the US is analyzed. The extreme precipitation started in the Southern US in the spring and propagated northward to the Midwest and the Great Lakes in the summer of 2015. This seasonal evolution of precipitation anomalies represents a typical mode of variability of US warm-season precipitation. Analysis of the atmospheric moisture flux suggests that such a rainfall mode is associated with moisture export from the subtropical North Atlantic. In the spring, excessive precipitation in the Southern US is attributable to increased moisture flux from the northwestern portion of the subtropical North Atlantic. The North Atlantic moisture flux interacts with local soil moisture which enables the US Midwest to draw more moisture from the Gulf of Mexico in the summer. Further analysis shows that the relationship between the rainfall mode and the North Atlantic water cycle has become more significant in recent decades, indicating an increased likelihood of extremes like the 2015 case. Indeed, two record-high warm-season precipitation events, the 1993 and 2008 cases, both occurred in the more recent decades of the 66 year analysis period. The export of water from the North Atlantic leaves a marked surface salinity signature. The salinity signature appeared in the spring preceding all three extreme precipitation events analyzed in this study, i.e. a saltier-than-normal subtropical North Atlantic in spring followed by extreme Midwest precipitation in summer. Compared to the various sea surface temperature anomaly patterns among the 1993, 2008, and 2015 cases, the spatial distribution of salinity anomalies was much more consistent during these extreme flood years. Thus, our study suggests that preseason salinity patterns can be used for improved seasonal prediction of extreme precipitation in the Midwest.
    Description: LL is supported by the Postdoctoral Scholar Program at WHOI, with funding provided by the Oceans and Climate Change Institute. RWS is supported by NASA Grants NNX12AF59G and NNX14AH38G, and NSF Grant OCE-1129646. CCU is supported by NSF Grant AGS-1355339.
    Keywords: US extreme precipitation ; Oceanic water cycle ; Ocean-to-land moisture transport ; Sea surface salinity
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  • 48
    Publication Date: 2022-05-26
    Description: © The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Progress in Earth and Planetary Science 4 (2017): 41, doi:10.1186/s40645-017-0154-5.
    Description: During the past several decades, the Earth system has changed significantly, especially across Northern Eurasia. Changes in the socio-economic conditions of the larger countries in the region have also resulted in a variety of regional environmental changes that can have global consequences. The Northern Eurasia Future Initiative (NEFI) has been designed as an essential continuation of the Northern Eurasia Earth Science Partnership Initiative (NEESPI), which was launched in 2004. NEESPI sought to elucidate all aspects of ongoing environmental change, to inform societies and, thus, to better prepare societies for future developments. A key principle of NEFI is that these developments must now be secured through science-based strategies co-designed with regional decision-makers to lead their societies to prosperity in the face of environmental and institutional challenges. NEESPI scientific research, data, and models have created a solid knowledge base to support the NEFI program. This paper presents the NEFI research vision consensus based on that knowledge. It provides the reader with samples of recent accomplishments in regional studies and formulates new NEFI science questions. To address these questions, nine research foci are identified and their selections are briefly justified. These foci include warming of the Arctic; changing frequency, pattern, and intensity of extreme and inclement environmental conditions; retreat of the cryosphere; changes in terrestrial water cycles; changes in the biosphere; pressures on land use; changes in infrastructure; societal actions in response to environmental change; and quantification of Northern Eurasia’s role in the global Earth system. Powerful feedbacks between the Earth and human systems in Northern Eurasia (e.g., mega-fires, droughts, depletion of the cryosphere essential for water supply, retreat of sea ice) result from past and current human activities (e.g., large-scale water withdrawals, land use, and governance change) and potentially restrict or provide new opportunities for future human activities. Therefore, we propose that integrated assessment models are needed as the final stage of global change assessment. The overarching goal of this NEFI modeling effort will enable evaluation of economic decisions in response to changing environmental conditions and justification of mitigation and adaptation efforts.
    Description: Support for most of the US authors and contributors of this paper as well as the multiannual support for the office of the NEESPI Project Scientist was provided by the NASA Land Cover and Land Use Change (LCLUC) Program, in particular, by grants NNX13AC66G, NNX11AB77G, NNX13AN58G, NNX15AD10G, NAG5–11084, 08–LCLUC08–2–0003, NNX14AD88G, NNX08AW51G, NNX12AD34G, NNX14AD91G, and NNX15AP81G. The research carried out at the Jet Propulsion Laboratory, California Institute of Technology, was also supported by the NASA LCLUC Program. Support of NASA grants 08–TE08–029 and NNH09ZDA001N–IDS for AS and NT are acknowledged. Research of MS is supported by Newton-al-Farabi Fund (grant 172722855). Grant 14.B25.31.0026 of the Ministry of Education and Science of the Russian Federation provided support to PG, SG, NT, AS, OB, BP, and IP for their work conducted at the P.P. Shirshov Institute of Oceanology. The Project “ARCTIC-ERA: ARCTIC climate change and its impact on Environment, infrastructures, and Resource Availability” sponsored by: ANR (France), RFBR (Russia), and the US NSF (grants 1717770 and 1558389) in response to Belmont Forum Collaborative Research Action on Arctic Observing and Research for Sustainability provided support for OZ, SG, BP, PG, and NS. A part of the paper is based on the research carried out with the financial support of the Russian Foundation for Basic Research (Project No. 15–06–08163 “Assessment and forecast of the socioeconomic and environmental implications of the climate change in the Arctic region”). Support for AP is provided by the Russian Government Program of Competitive Growth of Kazan Federal University (OpenLab Initiative). Support for JA is provided by grant NPUILO1417 of the Ministry of Education, Youth and Sports of Czechia.
    Keywords: Environmental changes ; Northern Eurasia ; Ecosystems dynamics ; Terrestrial water cycle ; Cryosphere retreat ; Extreme and inclement environmental conditions ; Sustainable development ; Land cover and land use change ; Integrated assessment models for decision-makers
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    In:  EPIC3Building bridges at the science-stakeholder interface - Towards knowledge exchange in Earth System Science, SpringerBriefs in Earth System Sciences, Cham, Switzerland, Springer, pp. 69-72, ISBN: 978-3-319-75918-0
    Publication Date: 2023-06-21
    Description: The new knowledge and data portal ‘meereisportal.de’ is a contribution to the cross-linking of scientifically qualified information on climate change. It focuses deliberately on the theme ‘sea ice in both Polar Regions’. With the establishment of ‘meereisportal.de’, science adapts to changing societal demands and embarks on new ways of communication between science and society.
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    In:  EPIC3YOUMARES 8 – Oceans Across Boundaries: Learning from each other, Cham, Springer, pp. 109-124, ISBN: 978-3-319-93283-5
    Publication Date: 2023-06-21
    Description: From the depths of the oceans to the shallow estuaries and wetlands of our coasts, organisms of the marine environment are teeming with unique adaptations to cope with a multitude of varying environmental conditions. With millions of years and a vast volume of water to call their home, they have become quite adept at developing specialized and unique techniques for survival and – given increasing human mediated transport – biological invasions. A growing world human population and a global economy drives the transportation of goods across the oceans and with them invasive species via ballast water and attached to ship hulls. In any given 24-hour period, there are about 10,000 species being transported across different biogeographic regions. If any of them manage to take hold and establish a range in an exotic habitat, the implications for local ecosystems can be costly. This review on marine invasions highlights trends among successful non-indigenous species (NIS), from vectors of transport to ecological and physiological plasticity. Apart from summarizing patterns of successful invasions, it discusses the implications of how successfully established NIS impact the local environment, economy and human health. Finally, it looks to the future and discusses what questions need to be addressed and what models can tell us about what the outlook on future marine invasions is.
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    In:  EPIC3Building bridges at the science-stakeholder interface - Towards knowledge exchange in earth system science, SpringerBriefs in Earth System Sciences, Cham, Switzerland, Springer, 132 p., pp. 19-29, ISBN: 987-3-319-75918-0
    Publication Date: 2023-06-21
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    In:  EPIC3Geophysical Research Letters, American Geophysical Union (AGU), 45(23), pp. 12972-12981, ISSN: 0094-8276
    Publication Date: 2023-01-30
    Description: The Arctic Ocean is known to be contaminated by various persistent organic pollutants (POPs). The Fram Strait, the only deepwater passage to the Arctic Ocean (from the Atlantic Ocean), represents an unquantified gateway for POPs fluxes into and out of the Arctic. Polyethylene passive samplers were deployed in vertical profiles in the Fram Strait and in air and surface water in the Canadian Archipelago to determine the concentrations, profiles, and mass fluxes of dissolved polychlorinated biphenyls (PCBs) and organochlorine pesticides. In the Fram Strait, higher concentrations of ΣPCBs (1.3–3.6 pg/L) and dichlorodiphenyltrichloroethanes (ΣDDTs, 5.2–9.1 pg/L) were observed in the deepwater masses (below 1,000 m), similar to nutrient-like vertical profiles. There was net southward transport of hexachlorobenzene and hexachlorocyclohexanes (ΣHCHs) of 0.70 and 14 Mg/year but a net northward transport of ΣPCBs at 0.16 Mg/year through the Fram Strait.
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    In:  EPIC3YOUMARES 8 – Oceans Across Boundaries: Learning from each other, YOUMARES 8 – Oceans Across Boundaries: Learning from each other, Phytoplankton Responses to Marine Climate Change – An Introduction, Springer, pp. 55-71, ISBN: 978-3-319-93284-2
    Publication Date: 2023-06-21
    Description: Phytoplankton are one of the key players in the ocean and contribute approximately 50% to global primary production. They serve as the basis for marine food webs, drive chemical composition of the global atmosphere and thereby climate. Seasonal environmental changes and nutrient availability naturally influence phytoplankton species composition. Since the industrial era, anthropogenic climatic influences have increased noticeably – also within the ocean. Our changing climate, however, affects the composition of phytoplankton species composition on a long-term basis and requires the organisms to adapt to this changing environment, influencing micronutrient bioavailability and other biogeochemical parameters. At the same time, phytoplankton themselves can influence the climate with their responses to environmental changes. Due to its key role, phytoplankton has been of interest in marine sciences for quite some time and there are several methodical approaches implemented in oceanographic sciences. There are ongoing attempts to improve predictions and to close gaps in the understanding of this sensitive ecological system and its responses.
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    In:  Astrophysics and Space Science Library
    Publication Date: 2020-02-12
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    Helgoland marine research 1 (1938), S. 93-111 
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    Helgoland marine research 1 (1938), S. 141-161 
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    Helgoland marine research 1 (1938), S. 162-199 
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    Topics: Biology
    Notes: Zusammenfassung der Hauptergebnisse 1. Die Morphologie und Systematik des DekapodenkrebsesCallianassa wurde an 6 europäischen Arten, unter denen sich 3 neue befanden, beschrieben und abgebildet. Diese 6 Arten bilden, obwohl sie z. T. erhebliche Abweichungen zeigen, doch einen einheitlichen Formenkreis. 2. Während die Darstellung der embryonalen Entwicklung vom Ei aus noch nicht gelang, wurde die postembryonale Entwicklung über IV Larvenstadien zum postlarvalen und Parvastadium sowie das voraussichtlich weitere Wachstum vonCallianassa behandelt und durch Abbildungen erläutert. 3. Die Oekologie des Krebses betreffend wurden seine horizontale und vertikale Verbreitung, seine Lebensweise und Umwelt geschildert. Insonderheit wurde die Bedeutung des Grabfußes, des optischen Apparates und der Tastorgane einer eingehenden Betrachtung unterzogen.
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    Helgoland marine research 1 (1938), S. 112-140 
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    Notes: Zusammenfassung 1.) Zur Prüfung der Wärmewertfaktoren für Protein, Aetherextrakt, Kohlenhydrate und Chitin bei Polychaeten, Crustaceen, Mollusken und Fischen wurde je ein relativ leicht zu beschaffendor Typ untersucht. 2.) Der aus experimentellen Daten durch Differenz bestimmte Wärmewert für Protein (5702 cal/g) stimmt mit den schon bekannten Werten für Eiweißprodukte (∼5662 bis ∼5858 cal/g) befriedigend überein. Der Aetherextrakt, der geringe Beimengungen als Folge der Analysenmethode enthält, hat einen etwas niedrigeren Heizwert (9166 cal/g) als bisher bekannt. Der Wert für das Glykogen (4094 cal g) ist ebenfalls etwas kleiner als der letzthin vonBrookens (3) gefundene Wert von 4215 cal g. Der Unterschied wird auf geringen Wassergehalt des in dieser Arbeit untersuchten Glykogens zurückgeführt. Der Wärmewert des Chitins beträgt 4513 cal/g. 3.) Es wurden Analysen vonArctica islandica, Cardium edule undCorbula gibba mitgeteilt. Die Wärmewerte dieser Tiere wurden mit den experimentell ermittelten Faktoren errechnet.
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    Helgoland marine research 1 (1938), S. 199-199 
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    Acta biotheoretica 4 (1938), S. 25-32 
    ISSN: 1572-8358
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    Topics: Biology
    Description / Table of Contents: Résumé La réduction des animaux de la mer profonde (zone abyssale) est un phénomène primordial. En rapport avec cela, des transformations compensatoriques de conservation personelle, encore non utilisées, rendent possible pour l'organisme, qu'en se réfugiant dans un milieu homogène (zones abyssales) il y puisse maintenir sa vie, de même, que dans un asile suprême. La réduction est un phénomène primordial automatique (autogène), la résidence dans le milieu homogène est un phénomène secondaire.
    Notes: Summary The reduction of deep-see animals is a primordial phenomenon. Connected with this, compensatory transformations of self-preservation, not yet gotten to validity, make it possible for the organism, that while descending in homogeneous surroundings (in abyssal zones) it may keep itself alive, maintaining its life in that last refuge. Reduction is a primordial automatical (autogeneous) phenomenon, permanent dwelling in homogeneous surroundings is a secondary phenomenon.
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    Acta biotheoretica 4 (1938), S. 51-64 
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    Description / Table of Contents: Résumé La conception de „prospektive Potenz” fut définie par son auteur H.Driesch comme „l'ensemble des modes de développement possibles d'une certaine partie de l'embryon”. Cependant, le, mot „Potenz” dans le langage de la science répond plutôt à la „puissance” qu'à la „possibilité”. De là résulte, que cette conception dès son origine avait une certaine ambiguïté, qui se fait sentir jusqu'à présent. La distinction entre „potentialité active” et „potentialité passive”, proposée par Roux, n'est pas acceptée généralement. Il se trouvait nécessaire, que la conception de „Potenz” fût soumise à une. analyse profonde. D'abord il est démontré, que l'ambiguïté de cette conception disparaît, si on entend par le mot „Potenz” les propriétés fondamentales du matériel embryonnaire, qui sont à la base de ses diverses possibilités de développement. On peut distinguer parmi ces propriétés les „pouvoirs réactifs”, en vertu desquels le matériel embryonnaire répond à des inductions morphogénétiques, et les „tendances propres” du matériel. Ils ne diffèrent que par leur intensité; un „pouvoir réactif” peut se changer en „tendance” par suite d'un renforcement au cours du développement, une „tendance” peut se changer en „pouvoir réactif” par une diminution d'intensité. La détermination du matériel se réalise par une „lutte” entre les tendances. Les actions inductives influent sur cette lutte en renforçant ou en diminuant l'intensité des diverses tendances, et en activant de nouvelles tendances par le renforcement de „pouvoirs réactifs”.
    Notes: Summary The conception of “prospective potency” was defined by its author H.Driesch as “the sum of the possible modes of development of a given part of the embryo”. However, in the language of science the word “potency” usually means “power”, not “possibility”. Therefore this conception from the beginning possessed a certain ambiguity, that it retained up to the present. The distinction of “active” and “passive” potency, introduced by Roux, has found no general acceptance. It appeared necessary to submit the conception of “potency” to a profound analysis. In the first place it is shown, that the ambiguity of this conception vanishes, if we understand by the word “potency” those fundamental properties of the embryonic material, that are responsible for its various developmental possibilities. We can distinguish among these properties the “reactive powers”, by which the embryonic material reacts to inductive stimulations, and its own “developmental tendencies”. These faculties only differ by their strength; a “reactive power” may change into a “tendency”, when its intensity increases during development; conversely, a “tendency” may change into a mere “reactive power” by a decrease of its strength. The determination of the material results from the conflict of its tendencies. The inductive actions interfere by strengthening or weakening different tendencies, and by activating new tendencies by reinforcement of the “reactive powers” of the embryonic material.
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    Acta biotheoretica 4 (1938), S. 85-96 
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    Description / Table of Contents: Résumé Dans l'organisation des divers animaux on peut distinguer les parallélismes suivants: 1) les homologies qui dénotent la descendance des porteurs des organes similaires d'un seul et même ancêtre, 2) les analogies qui se forment sous l'influence d'une fonction analogue ou des mêmes conditions extérieures, et 3) les homomorphies qui représentent la manifestation des propriétés fondamentales de la substance animée. Les homologies sont les phénomènes de l'ordre historique, tandis que les homomorphies et les analogies doivent être étudiées d'après une méthode typologique. Si une similitude homomorphique des formes se manifeste partout dans le règne animal ou au moins dans tous les cas où se trouvent des conditions favorables, il faut parler d'une homomorphie générale (p. ex. les structures trajectorielles). Si au contraire on observe le parallélisme seulement dans les cas isolés, comme p. ex. les yeux composés chez les Arthropodes, les Vers et les Mollusques, il faut parler de l'homomorphie spéciale. La limite entre ces deux catégories des phénomènes n'est pas très précise. De même il est difficile parfois de définir strictement si nous avons à faire à une homologie, à une analogie ou à une homomorphie. Tous ces phénomènes-là dépendent finalement des lois morphogénètiques. C'est pourquoi qu'on peut les indiquer comme des homomorphies dans le sens le plus étendu de ce mot.
    Notes: Zusammenfassung Man unterscheidet in der Organisation verschiedener Tiere folgende Kategorien von Parallelismen: 1) die Homologien, welche auf einen gemeinsamen Ursprung der betreffenden Organe hinweisen, 2) die Analogien, die als eine Folge von ähnlichen Funktionen (typische Analogie) oder der äusseren Wirkungen (Isomorphie) sekundär enstehen, 3) die Homomorphien, wodurch ich diejenigen Übereinstimmungen im Körperbau von verschiedenen Tieren bezeichne, welche auf Grund der allgemeinen Gesetze der Morphogenese zustande kommen. Das Studium der Homologien ist historischer Art, dasjenige der Homomorphien und Analogien typologischer Art. Man kann weiter unterscheiden: eine allgemeine Homomorphie, welche sich im Tierreiche überall, wo dazu günstige Bedingungen vorhanden sind, offenbart (z.B. trajektorielle Strukturen), und eine spezielle Homomorphie, welche als eine der Möglichkeiten bei einer begrenzten Anzahl von Tierformen hervortritt (z.B. die Komplexaugen neben den anderen drei Haupttypen von Sehorganen). Die Grenze zwischen diesen beiden Kategorien ist natürlich nicht sehr deutlich, ebenso wie manchmal die Grenze zwischen Homologien, Homomorphien und Analogien. Alle diese Erscheinungen beruhen letzten Endes auf morphogenetischen Gesetzen, können also als Homomorphien im weitesten Sinne des Wortes bezeichnet werden.
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    Acta biotheoretica 4 (1938), S. 133-153 
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    Description / Table of Contents: Résumé Après une mise au point générale de la relation entre les sciences théoriques et expérimentales, diverses questions sont discutées, du point de vue des fondations physico-mathématiques de la biologie, développées récemment par l'auteur. On montre par la comparaison des courbes calculées à celles observées, comment les relations prédites mathématiquement se trouvent vérifiées. Les questions suivantes sont discutées: respiration cellulaire, dimensions cellulaires et leur rapport au métabolisme, division cellulaire, mouvements protoplasmiques, excitation nerveuse, les lois psychophysiques, perception des formes géométriques.
    Notes: Zusammenfassung Nach einer allgemeinen Diskussion des Zusammenhanges zwischen theoretischer und experimenteller Forschung, wird in Hinblick auf die vom Verfasser entwickelten physikalisch-mathematischen Grundlagen der Biologie, eine Reihe von Einzelproblemen betrachtet. Es wird an Hand von Kurvenmaterial gezeigt wie weit die mathematisch vorausgesagten Beziehungen mit den experimentellen Befunden übereinstimmen. Folgende Fragen werden besprochen: Zellatmung, Zellgrössen, deren Abhängigkeit von Stoffwechsel, Zellteilung, Protoplasmaströmungen, Nervenerregung, psychophysische Gesetze, Reaktion auf geometrische Gestalten.
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    Acta biotheoretica 4 (1938), S. 1-24 
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    Description / Table of Contents: Résumé Le problème de l'asymétrie du protoplasma mérite un examen critique. Cela pourrait aider à formuler une série de questions fondamentales exigeant en premier lieu une étude expérimentale ultérieure. À commencer par la terminologie, on doit distinguer d'une part la dissymétrie, propriété de la molécule individuelle de posséder une image non superposable, qui apparaît à un niveau déterminé de complexité dans l'architecture spatiale de la molécule, et d'autre part, l'asymétrie comme une propriété des ensembles de molécules, représentant le manque dans ces ensembles de l'égalité de forme dissymétriques de droite et de gauche. Pour le biologiste, l'asymétrie des ensembles moléculaires est d'un intérêt particulier, en ce qu'elle présente une propriété spécifique du protoplasma, et qu'elle manque dans toutes les substances dissymétriques, qui se forment au cours des processus terrestres, indépendamment de l'activité des êtres vivants. On peut poser ici trois questions principales: 1. Quel est l'aspect descriptif de l'asymétrie du protoplasma? Quels sont les composants protoplasmiques pour lesquels l'asymétrie des ensembles moléculaires est obligatoire, et ceux pour lesquels elle ne l'est point, chez les divers représentants du règne animal et du règne végétal? 2. Quelle est la valeur physiologique de l'asymétrie protoplasmique, et de quelle manière cet état spécifique se maintient-il? 3. Comment, à la lumière de ces données, peut on se figurer l'origine de l'asymétrie du protoplasma? Dans l'essentiel, l'architecture asymétrique du protoplasma se ramène au fait que celui-ci est construit avec les représentants d'une série déterminée d'antipodes „naturels”. Par cela même il y a là un état de fixité précise du paramètre, qui caractérise les propriétés spatiales de la matière. Cet état de fixité est une condition importante pour la réalisation des délicates coordinations protoplasmiques. Á un point de vue plus général, l'état de fixité du paramètre spatial constitue un cas particulier de la proposition bien connue deClaude Bernard: „La fixité du milieu intérieur est la condition de la vie libre”. Dans le présent article on discute en détail les faits nombreux qui permettent d'affirmer que dans l'organisation physiologique de la cellule, une série d'adaptations spéciales profondes empêchent la racémisation du protoplasma, inévitable au point de vue thermodynamique, et maintenant l'état asymétrique spécifique du protoplasma. Éclairée ainsi par les faits, l'origine du protoplasma asymétrique peut s'expliquer à l'aide de la théorie de la sélection naturelle. L'état asymétrique du système protoplasmique, par comparaison avec l'état racémique, accorde à son possesseur nombre d'avantages biologiques.
    Notes: Zusammenfassung Das Problem der Asymmetrie des Protoplasmas bedarf einer kritischen Besprechung, die der Formulierung einer Reihe grundlegender Fragen, die in erster Linie einer weiteren experimentellen Bearbeitung bedürfen, förderlich sein kann. Vor allem muss hier mit der Terminologie begonnen werden. Man muss unterscheiden: die Dissymmetrie, als Eigenschaft des individuellen Moleküls ein sich mit dem Urbild nicht deckendes Spiegelbild zu besitzen, welche Eigenschaft bei einem bestimmten Niveau der Kompliziertheit der räumlichen Architektur des Moleküls eintritt, und, andererseits, die Asymmetrie als Eigenschaft der Gesamtheit der Moleküle, die in der Abwesenheit der Gleichheit der rechten und linken dissymmetrischen Formen in diesen Gesamtheiten besteht. Für den Biologen bietet die Asymmetrie der molekulären Gesamtheiten insofern Interesse, als sie eine spezifische Eigenschaft des Protoplasmas ist und bei allen dissymmetrischen Stoffen fehlt, die in den irdischen Prozessen unabhängig von der Tätigkeit lebender Wesen entstehen. Hier können folgende grundlegende Fragen gestellt werden: 1. Welcher Art ist der deskriptive Aspekt der Asymmetrie des Protoplasmas? Für welche Komponenten des Protoplasmas ist die Asymmetrie der molekularen Gesamtheiten bei den verschiedenen Vertretern des Tier- und Pflanzenreiches obligatorisch und für welche nicht? 2. Welcher Art ist die physiologische Bedeutung der Asymmetrie des Protoplasmas, und auf welche Weise wird dieser spezifische Zustand aufrechterhalten? 3. Wie kann man sich im Lichte aller dieser Daten die Entstehung der Asymmetrie des Protoplasmas vorstellen? Die asymmetrische Architektur des Protoplasmas läuft im Grunde darauf hinaus, dass das Protoplasma aus Vertretern einer bestimmten Reihe „natürlicher” Antipoden aufgebaut ist. Hierdurch findet eine genaue Fixiertheit des die räumlichen Eigenschaften des Stoffes charakterisierenden Parameters statt. Diese Fixiertheit ist eine wichtige Bedingung für die Verwirklichung der feinen protoplasmatischen Koordinationen. Von allgemeinerem Standpunkt aus ist die Fixiertheit des räumlichen Parameters ein Spezialfall des bekanntenClaude Bernard'schen Gesetzes: „La fixité du milieu intérieur est la condition de la vie libre”. Im Artikel werden zahlreiche Angaben eingehend besprochen, die es gestatten zu behaupten, dass eine Reihe spezieller und tiefer Anpassungen in der physiologischen Organisation der Zelle die vom thermodynamischen Standpunkt unvermeidliche Razemisation des Protoplasmas verhindern, und den spezifischen Zustand der Asymmetrie des Protoplasmas aufrechterhalten. Im Lichte dieser Angaben kann die Entstehung der Asymmetrie des Protoplasmas mit Hilfe der Theorie der natürlichen Zuchtwahl erklärt werden. Der asymmetrische Zustand des Protoplasmasystems verleiht seinem Besitzer eine Reihe biologischer Vorzüge im Vergleich mit dem razemischen Zustand.
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    Acta biotheoretica 4 (1938), S. 119-132 
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    Acta biotheoretica 4 (1938), S. 33-50 
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    Acta biotheoretica 4 (1938), S. 65-72 
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    Description / Table of Contents: Résumé 1) L'ontogenèse peut être expliquée de deux manières différentes: a) historiquement; elle se passe du passé au présent. b) idéalistiquement; elle se passe de l'universel au particulier. 2) Le développement du dimorphisme du sexe est contradictoire à l'interprétation historique et affirme la conception idéalistique. 3) Par conséquent il faut remplacer la morphologie phylogénétique par l'idéalistique. 4) De façon analogue l'idiogenèse et la morphogenèse se passent de l'universel au particulier. Il existe un parallélisme de l'ordre d'existence et de l'ordre des pensées.
    Notes: Summary 1) The Ontogenesis can be explained in a double way: a) historically: it runs from the past to the present. b) idealistically: it runs from the general to the special. 2) The development of the dimorphism of sex tells against the historical and for the idealistical perception. 3) Therefore the idealistical morphology has to be put in the place of the phylogenetical. 4) Idiogenesis and Morphogenesis are going analogically from the general to the special. There exists parallelism of the order of thinking and being.
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    Acta biotheoretica 4 (1938), S. 73-84 
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    Description / Table of Contents: Résumé Dans ce traité il s'agit d'une discussion de la conception de causalité „holistique” qui a remplacé l'autocratie de la „causalité mécanique”, du „mécanisme”. Dans des séquences d'événements, l'intellect reconnaît des causalnexus, en observant ou l'impulsion, le motif, le stimulus de l'action — ou, dans la transformation initiée, la conservation de la matière et de l'énergie: causalité impulsatrice („Anstosskausalität” A.K.) et causalité conservatrice („Erhaltungskausalität” E.K.). A l'ordinaire ces deux causalités sont étroitement liées; mais souvent elles se laissent distinguer sans difficulté. Par exemple, les effets catalytiques et les influences stimulantes sont expressément des formes de l'A.K. Si une „totalité” (un „tout”), c.-à-d. un système, un ordre en coïncidences, plus ou moins clos et stable, est „poussé” ou stimulé (du dehors ou de l'intérieur), il répond, du fonds de son énergie libre, par une action qui unit en soi l'A.K., l'E.K. et la réciprocité („Wechselwirkung” W.W.). Cette causalité complexe est la causalité holistique (la „Ganzheitskausalität” G.K.), déjà existante dans l'inorganique. Elle apparaît parfaite dans la causalité stimulus (la „Reizkausalität” R.K.) de l'organisme à tendances formatives et conservatives, ainsi que dans tous les rapports psychophysiques: A.K. psychique, causalité motive. Ainsi, il y a dans la „Mer constante de la matière et de l'énergie” un „courant d'inquiétude” qui se présente comme l'A.K. Cet „esprit” laisse reconnaître une distincte hiérarchie („Rangordnung”), s'étendant de la causalité dans la physique atomaire et la causalité mécanique, chimique et catalytique, jusqu'à l'„excitation” physio-biologique et jusqu'à la causalité directrice et évolutionnaire, psychique ou même „superpsychique”.
    Notes: Summary The article discusses the concept of “holistic” causality which has superseded that of “mechanistic causality”, “mechanism”. In a sequence of events a causal nexus is mentally established, attention being directed either to the initiation, the starting, the incitation of the process or to the conservation of matter and energy in the initiated transformation: initiation causality (“Anstosskausalität” A.K.) and conservation causality (“Erhaltungskausalität” E.K.). As a rule, the two kinds of causality are intimately interlinked, though they often are easily to be distinguished; for instance, catalytic causation and stimulus influences are clearly forms of A.K. If a “totality” (a “whole”), i.e., a more or les closed and stable uniformity of coexistences, is “pushed” or incited (from without or from within), it actively responds from its content of free energy by an event combining within itself A.K., E.K., and reciprocity (“Wechselwirkung” W. W.). This complex causality is holistic causality (“Ganzheitskausalität” G.K.). Holistic causality, already to be found in the inorganic, appears to perfection in the stimulus causality (“Reizkausalität” R.K.) of organism with its development of form and conservation of form; likewise in the entire psycho-physical phenomenation: psychic A.K., motive causality. Thus, in the constant “Ocean of matter and energy” there is a “demon of unrest” in the guise of A.K., setting up a distinct hierarchy (“Rangordnung”) ranging from atomistic causality to mechanic, chemical, and catalytic causality, and beyond to physiobiological “incitation” and to psychic, or even “supra-psychic”, direction and evolution causality.
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    Acta biotheoretica 4 (1938), S. 111-118 
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    Description / Table of Contents: Résumé La biologie totalitaire qui, ces dernières années, a pris une très grande extension chez les biologistes et les philosophes, requiert une attitude nouvelle vis à vis du problème de la vie, attitude qui puisse nous mener au-delà de l'opposition entre le mécanisme et le vitalisme. Le mécanisme est rejeté par les partisans de la biologie totalitaire; la vie est plus qu'un processus physico-chimique excessivement compliqué. D'autre part la nature spéciale du processus vital devra être expliquée par l'idée totalitaire, comprise uniquement de la façon dont on l'entend dans les sciences naturelles. Cette nature spéciale ne devra pas être expliquée, comme le fait le vitalisme, par l'introduction de facteurs métaphysiques comme par exemple l'entéléchie. Le but de la présente critique est de démontrer que l'idée totalitaire est employée souvent par les partisans de la biologie totalitaire purement dans le sens de l'entéléchie, c'est à dire comme un principe métaphysique. D'autre part notre critique cherche à démontrer que la totalité, comprise uniquement de la façon dont on l'entend dans les sciences naturelles, ne nous mène pas au-delà de l'opposition entre le mécanisme et le vitalisme. Cela est vrai aussi pour le holisme deMeyer, dont l'idée fondamentale (la dérivation de la physique théorique de la biologie théorique par la simplification des formules) n'est pas nécessairement fausse pourtant et est en tout cas très digne de considération.
    Notes: Summary Holistic biology, which during the last years has gained wide acceptance amoungst biologists and philosophers, aspires to a new point of view as regards the problem of life which transcends the opposing theories of mechanism and vitalism. The exponents of holism repudiate the purely mechanical theory, the principle of life is something more than a highly complicated physico-chemical process. At the same time, however, the characteristics of life should be traced to the principles of pure natural science, untroubled by the introduction of metaphysical factors such as entelechy etc. This critical review endeavours to show that holism is often used by its exponents entirely in the sense of entelechy, that is to say as a metaphysical principle. On the other hand we seek to point out that where holism has been used in the sense of natural science it by no means bridges the gulf between mechanism and vitalism. The same comment applies to the holism ofMeyer, the foundation of which (namely the deduction of theoretical physics from theoretical biology by simplifying the formula) may be right after all and is worthy of consideration.
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    Description / Table of Contents: Résumé L'auteur continue la publication des résultats de ses recherches faites sur des êtres vivants unicellulaires, notamment desSaccharomyces. Cette publication fut communiquée dans les Acta Biotheoretica I, p. 113–132. Par la méthode de la culture unicellulaire, l'auteur a créé une culture pure et, de celli-ci, au moyen d'inoculations périodiques, il a créé des descendants. Il a mesuré la marche du développement en pesant le CO2 produit au cours de la vie. La courbe d'évolution ontogénétique, tant de la culture-mère que des descendants, a présenté une ligne enS, mais chacun de cesS ne montait pas de la même façon (Fig. 1). En représentant ces courbes d'évolution enS en fonction du temps et à l'échelle des périodes d'inoculation sur des coordonnées rectilignes, il obtenait une surface d'ondes (Fig. 2). En coupant cette surface par un plan parallèle à l'abscisse et à l'axe vertical, il obtenait des lignes ondoyantes qui ressemblaient à un mouvement oscillatoire se formant autour d'un axe à l'image régulière (Fig. 3). Les examens ont révélé que l'axe suit les lois du mouvement vibratoire harmonique apériodique et que la courbe ondoyante répond au phénomène du mouvement vibratoire harmonique périodique. L'un et l'autre provenant de l'équation différentielle communed 2 s/dt 2 + 2r ds/dt +w 2 s=o. N'importe quel point de l'axes h qui suit un mouvement vibratoire harmonique apériodique est déterminé par l'équation suivante: (8a) $$s_h = a_1 e^{ - r_1 t} \cdot \frac{{e^{ + t\sqrt {r_1 ^2 - w_1 ^2 } } - e^{ - t\sqrt {r_1 ^2 - w_1 ^2 } } }}{2} \cdot \cdot \cdot \cdot \cdot $$ cependant que la courbe ondoyante s p qui montre un mouvement vibratoire harmonique périodique est exprimée par l'équation suivante (8b) $$s_p = a_2 e^{ - r_2 t} \cos (t\sqrt {w_2 ^2 - r_2 ^2 } ) \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot $$ Le mouvement complety se compose de la somme des deux mouvements oscillatoires,y =s h +s p . Pour le moment, les examens n'ont trait qu'à l'axe apériodique. Les calculs prouvent que par l'équation sh (8a) les axes apériodiques appartenant à toutes les coupes (Fig. 4) peuvent être suivis avec exactitude comme fonctions du tempst, et que même le changement de la valeur des coefficientsw 1 ,r 1 ,a 1, présente aussi une régularité nette (Fig. 5, 6, 7). L'auteur examine ensuite le calcul du temps maximum=t max et, en outre, la valeur maximum =s hmax de l'axe de la courbe vibratoire et il énonce que toute cellule et tout organisme composé de cellules ont dans le cours de leur développement un temps maximum et une valeur maximum. Le tempst maximum sera: (24) $$t_{max} = \frac{I}{{\sqrt {r_{1^2 } - w_{1^2 } } \log e}}\log \sqrt {\frac{{r + \sqrt {r_{1^2 } - w_{1^2 } } }}{{r - \sqrt {r_{1^2 } - w_{1^2 } } }}} \cdot \cdot \cdot \cdot $$ En substituant la valeur dut max dans l'équation originale de l'axe (8a), on obtient la valeur numérique dut max . Finalement, après avoir déterminé le fait que dans le développement des êtres vivants, on est en présence d'un mouvement vibratoire harmonique périodique et que l'axe de cette oscillation complexe suit l'équation du mouvement vibratoire harmonique apériodique, l'auteur constate que cette détermination constitue un résultat fondamental pour l'étude théoritique des phénomènes vitaux et ce résultat possède en même temps une grande importance pratique pour l'étude de l'amélioration, du sélectionnement, de l'hérédité et de la biologie de la race.
    Notes: Summary Author continues the publication which appeared in the Acta Biotheoretica I, p. 113–132, regarding his results obtained in course of research work on superior plants:Picea excelsa trees, and furthermore on unicellular living beings, namely yeast cells (Saccharomyces spec). Author made a pure culture with the unicellular culture method, and by occasional inoculation produced successors therefrom. He established the progress in development by measuring, according to weight, the CO2 which arose in course of life. The ontogenetic course of development of the original culture as well as that of the successors took the form ofS but theseS curves were not equally precipitous (Fig. 1). When he drew theS-formed development curves in the measure of their time of inoculation in a rectangular co-ordinate system, he received a wave-surface (Fig. 2). When he intersected the wave-surface with the abscissa and the plane parallel with the vertical axis, wave-like lines were the result, which resembled vibratory motion evolving around an axis producing a regular picture (Fig. 3). Research has ascertained that the axis follows the laws of aperiodic vibratory motion, the undulating curve corresponds with the phenomenon of periodic vibratory motion, both of which are derived from the common differential equationd 2 s/dt 2 + 2r ds/dt +w 2 s=o. Any point of thes h axis following the aperiodic vibratory motion is given by the following equation: (8a) $$s_h = a_1 e^{ - r_1 t} \cdot \frac{{e^{ + t\sqrt {r_1 ^2 - w_1 ^2 } } - e^{ - t\sqrt {r_1 ^2 - w_1 ^2 } } }}{2} \cdot \cdot \cdot \cdot \cdot $$ while the wave-curve showing thes h periodic movement is given by the following equation: (8b) $$s_p = a_2 e^{ - r_2 t} \cos (t\sqrt {w_2 ^2 - r_2 ^2 } ) \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot $$ The completey movement is made up of the total of the two vibratory movementsy=s h +s p . The research for the time being refers merely to the aperiodic axis. Calculations show that with thes h equation, the aperiodic axes belonging to all the sections (Fig. 4) can be followed exactly, as the time function oft, and moreover, the change according to time in the size of the w1, r1, a1 coefficients also shows definite regularity (Figs 5, 6, 7). Author deals separately with the calculation of the axis maximal time =t max and the maximal value = s h max of the wave-curve, and establishes that the development speed of every cell and every organism built up from cells has a maximal point of time and a maximal value. Thet maximum point of time: (24) $$t_{max} = \frac{I}{{\sqrt {r_{1^2 } - w_{1^2 } } \log e}}\log \sqrt {\frac{{r + \sqrt {r_{1^2 } - w_{1^2 } } }}{{r - \sqrt {r_{1^2 } - w_{1^2 } } }}} \cdot \cdot \cdot \cdot $$ If we put thet max value in the place of the original (8a) equation of the axis we get the numeric value of thet max . Author finally establishes that the recognition of the fact that a harmonic vibratory motion plays a part in the evolution of living beings and that the axis of this complicated vibration follows the equation of aperiodic vibratory motion is a fundamental result in the theoretic study of the phenomena of life, which, besides, has also a great practical importance in the sphere of the study of improvement, inheritance and the biology of the species.
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    Acta biotheoretica 4 (1938), S. 154-164 
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    Description / Table of Contents: Résumé Les problèmes actuels, se trouvant sur le terrain du système nerveux organo-végétatif ont besoin d'être considérés d'un point de vue synthétique, qui unit les données morphologiques et fonctionnelles. Quant au développement phylogénique du système autonome on est obligé de reconnaître l'insuffisance de la théorie de l'origine ectodermale. Les dates phylogéniques montrent que le système susnommé doit être une differentiation d'une fonction intercellulaire et amboceptoire chez les organismes primitives. Dans ce sens chaque fonction a sa place. Le principe de la „toponomie holosynaptique” exprime la condition spatiale à laquelle doivent obéir toutes les possibilités de développement morphologique d'un système conducteur. Quant à la phylogénie du système végétatif ces considérations mènent jusqu'à une croissance de l'importance du rôle du mésoderme. Ce tissu, surtout considéré dans les théories plutôt en disgrace deTello et d'autres, doit présenter l'origine de quelques éléments tissulaires nerveux. Les données histologiques et celles de l'anatomie comparative, tant que la théorie de la neurobiotaxis sont en accord avec la conception développée.
    Notes: Summary Certain problems about the autonomic nervous system — as f.i. those about the development of ortho- and parasympathetic system — have to be seen in the light of synthetic morphologic-functional considerations. As for the origin of the vegetative nervous elements, the phylogenetic dates show, how the theory of ectodermal descent is one-sided from functional synthetic point of view. Every intercellular function has her place. Therefore the principle of “holosynaptic toponomy” conditions the possibilities of morphological development of every tissue conducting stimuli. In the case of the autonomic system this principle stresses the meaning of the importance of the mesoderm as a base of differentiation to certain nervous elements. Histological, comparative anatomical facts as well as the theory of neurobiotaxis are shown to be very well in harmony with the developed conception.
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    The European physical journal 108 (1938), S. 19-23 
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    Notes: Zusammenfassung Es wird untersucht, wie sich die Zähleigenschaften von Zählrohren durch Ausheizen und Füllen mit reinem Wasserstoff ändern.
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    The European physical journal 108 (1938), S. 1-18 
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    Notes: Zusammenfassung Es wird die Zündung und die Zündspannungssenkung untersucht unter der Voraussetzung, daß diese abhängen sowohl von der γ-Ionisierung als auch von sekundären Effekten. Die früher gefundenen Gesetzmäßigkeiten I bis III (vgl. unten) beruhen darauf, daß „quadratische Erregungen“ in die Gleichgewichts — bedingung eingeführt und durch Änderung der γ-Ionisierung mit der Raumladung begründet wurden. Zu den gleichen Gesetzmäßigkeiten I bis III führen daher auch alle sekundären Effekte, die durch quadratische Erregungen in der Gleichgewichtsbedingung berücksichtigt werden können. Die früher angegebenen Koeffizienten erfahren dadurch eine Erweiterung, die geeignet ist, die bisher nicht genügende Übereinstimmung zwischen Versuch und Rechnung bei Edelgasen zu beheben.
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    Notes: Zusammenfassung Es werden die Schwerpunkte der in den Emissionsspektren verschiedener Zn S-Phosphore auftretenden Banden bestimmt und untersucht, wie die einzelnen Banden der Gegenwart bestimmter Fremdmetalle oder dem Eigenleuchten des Grundmaterials zuzuordnen sind. Die bei Zusatz von CdS eintretende Verschiebung der Bandenschwerpunkte wird an einer Reihe von Phosphoren mit zunehmendem CdS-Gehalt untersucht und gezeigt, daß die Lage der Maxima mit dem molaren Verhältnis der Komponenten in regelmäßigem Zusammenhang steht. Auf ähnliche Beobachtungen Travničeks an CaSSrS-Mischphosphoren wird hingewiesen. Schließlich wird nachgewiesen, daß CdS nicht nur mit ZnS, sondern auch mit Erdalkalisulfiden Mischphosphore bildet.
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    The European physical journal 108 (1938), S. 40-44 
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    Notes: Zusammenfassung Die Bande des S2 λ 2799 (v′=10,v″=0) weist in Absorption und mit großer Dispersion deutliche Verbreiterung der Rotationslinien auf. Die Prädissoziationsgrenze muß daher bei λ 2829 (früher λ 2799) angenommen werden. Weil ein großer Unterschied in den Linienbreiten von den Banden λ 2799 und λ 2769 auftritt, liegt hier ein Fall von langsam einsetzender Prädissoziation vor. — Die Beobachtungen von Lochte-Holtgreven über Druckeinwirkung auf das prädissoziierte Gebiet konnten nicht bestätigt werden.
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    The European physical journal 108 (1938), S. 45-54 
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    Notes: Zusammenfassung Der Sprung der Dielektrizitätskonstante des festen HCl bei seinem Umwandlungspunkt (990abs.) wird zwischen 30 und 5000m Wellenlänge untersucht. Für Temperaturen unterhalb der Umwandlung werden Dispersion und dielektrische Verluste festgestellt, die bei der Umwandlung selbst ein Maximum erreichen. Bei 850 abs. liegen die stärkste Dispersion und der größte Verlust bei etwa 300m und rücken mit steigender Temperatur nach kurzen Wellen.
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    The European physical journal 108 (1938), S. 101-106 
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    Notes: Zusammenfassung Für Äthylalkohol- und Methylalkohol-Wasser-Mischungen wurden die Oberflächenspannungen und ihre Temperaturkoeffizienten bestimmt, um insbesondere Aufschluß zu erhalten über die Abhängigkeit des Temperaturkoeffizienten von der Konzentration.
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    The European physical journal 108 (1938), S. 85-100 
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    Notes: Zusammenfassung In früheren Arbeiten ist eine Methode zur Ultrarotphotographie angegeben worden, die das Auftreffen der Strahlung dadurch kenntlich macht, daß eine Substanz an der getroffenen Stelle durch die Wärmewirkung der ultraroten Strahlen zum Verdampfen gebracht wird. In der vorliegenden Arbeit wird über den Ausbau der Methode zu einem praktisch brauchbaren Verfahren berichtet. Es werden Vergleiche mit den bisherigen Empfangsinstrumenten und den ultrarotsensibilisierten Platten durchgeführt und einige Absorptionsspektren im Bereich von l bis 10 μ gebracht.
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    The European physical journal 108 (1938), S. 107-127 
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    Notes: Zusammenfassung Das Verhalten fester Dielektrika im elektrischen Wechselfeld wird unter der Voraussetzung untersucht, daß der „Nachwirkungsstrom“i(t) einem zeitlichen Verlauf der Formi(t)=B(ϑ+t)−n folgt. Die Ergebnisse werden mit den Resultaten bereits vorliegender experimenteller und theoretischer Untersuchungen verglichen.
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    Notes: Zusammenfassung 1. Aufgabenstellung. 2. Zusammenfassung der Beziehungen für die quantitative Untersuchung des Primärstromes in isolierenden Kristallen, die in unseren früheren Arbeiten benutzt worden sind. 3. Die Anwendbarkeit der gleichen Beziehungen auf die Messung stationärer Primärströme in Kristallen mit elektrolytischer Dunkelleitung. 4. Der Einfluß des lichtelektrischen Stromes auf die Feldverteilung in Kristallen mit elektrolytischer Dunkelleitung. 5. Elektronische Dunkelleitung führt zur Entstehung des Sekundärstromes. 6. Die quantitative Behandlung der lichtelektrischen Ströme in Gemischtleitern, d. h. in Kristallen mit sowohl elektrolytscher wie elektronischer Dunkelleitung. Sie wird zunächst nur für den Grenzfall der Sättigungsströme durchgeführt und sie zeigt, daß auch beim Auftreten von Sekundärströmen Sättigung erreicht werden kann. 7. Die allgemeine Beziehung für Gemischtleiter bei Berücksichtigung der Elektronenverluste. Es werden Elektronenverluste nach einem Exponentialgesetz zugrunde gelegt und Versuchsbedingungen vorausgesetzt, bei denen auch im belichteten Kristall eine praktisch lineare Peldverteilung erhalten bleibt. 8. Die elektrischen Eigenschaften unseres KH-KBr-Modellhalbleiters im Dunkeln. 9. Begründung für die Anwendbarkeit des exponentiellen Verlustgesetzes im KH-KBr-Modellhalbleiter. 10. Lichtelektrische Messungen am KH-KBr-Mischkristall mit nur elektrolytischer Dunkelleitung: 1. Kristalle mit homogener Belichtung; 2. Kristalle mit Lichtsonde. 11. Lichtelektrische Messungen am KH-KBr-Mischkristall mit elektronischer und elektrolytischer Dunkelleitung. 12. Lichtelektrische Primärströme, die trotz eines exponentiellen Verlustgesetzes der Wurzel aus der Lichtintensität proportional sind. 13. Zusammenfassung.
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    The European physical journal 108 (1938), S. 128-136 
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    Notes: Zusammenfassung Es wird gezeigt, daß der von Blackettfestgestellte Abfall des relativen Energieverlustes eines Elektrons beim Durchgang durch Metallplatten sich aus der Annahme einer kleinsten Wellenlänge von λ0=6,2 · 10−13cm (±10%) einwandfrei erklären läßt. Zum gleichen Wert führt eine Diskussion des aus dem Breiteneffekt ermittelten Energieverlustes, den ein Elektron beim Durchgang durch die Atmosphäre erleidet, sowie die Tatsache, daß die Energie der Schauerteilchen nach oben hin begrenzt erscheint.
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    The European physical journal 108 (1938), S. 681-697 
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    Notes: Zusammenfassung Die von Hiedemann und Mitarbeiter entwickelte Sichtbarmachungsmethode zur Bestimmung der Schallgeschwindigkeiten in Flüssigkeiten wird zu einer Präzisionsmethode hoher Absolutgenauigkeit ausgearbeitet. Zur absoluten Bestimmung der Schallfrequenz wurde eine Frequenzmeßeinrichtung konstruiert, deren Genauigkeit durch eine einzige Leuchtnormale gewährleistet wird. Die Leuchtquarzfrequenz wird durch Frequenzteilung beliebig untersetzt, und man kann eine Absolutgenauigkeit der Frequenzmessung von weit besser als 5 · 10−6 erreichen. Die zur Erzeugung der Schallwellen erforderliche Hochfrequenzwechselspannung wird von einem elektronengekoppelten Oszillator geliefert, der zur Erzielung einer großen Frequenzkonstanz in einen vollautomatisch arbeitenden Luftthermostaten eingebaut ist. Mit der so verbesserten Meßanordnung wird die Schallgeschwindigkeit verschiedener organischer Flüssigkeiten in Abhängigkeit von der Temperatur mit einer Absolutgenauigkeit von 6 bis 7 · 10−5 bestimmt. Aus den gemessenen Werten wird der Temperaturkoeffizient für das Intervall von 23 bis 27
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    The European physical journal 108 (1938), S. 698-713 
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    Notes: Zusammenfassung Es wird gezeigt, daß geschichtete Feldkathoden vom Aufbau Al-Al2O3-Cs2O im Hochvakuum außer durch schnelle Elektronen auch durch positive Gasionen angeregt werden können. — Durch Einlassen von Edelgas läßt sich die Erscheinung des abklingenden Malter-Stromes in eine Spritzentladung überführen, und umgekehrt geht aus dieser Entladung durch Abpumpen des Gases der Malter-Strom hervor. In Argon und Helium wurden zwei Spritzentladungstypen bei Drucken zwischen 10−4 und 1 Torr beobachtet, deren eine mit niedriger Brennspannung ohne Funkeln auf der Kathode und deren andere bei höherer Brennspannung mit Funkeln auf der Kathode brennt. — Die Emission der Feldkathoden erweist sich als stark temperaturabhängig. Mit steigender Temperatur nimmt die Emission stark ab und gleichzeitig nimmt die Abnahmegeschwindigkeit des abklingenden Malter-Stromes zu. — Aus den Vorgängen bei der Aktivierung der Malter-Kathode und ihrer Entaktivierung durch Sauerstoff wird auf den Aufbau der Kathodenschicht geschlossen.
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    Notes: Zusammenfassung Es ist der Intensitätsverlauf der Linien der CuH-Bande λ 4280 bei Anregung im Bogen und bei Anregung in der mit Wasser und mit flüssiger Luft gekühlten Hohlkathode untersucht worden. Dabei wurde folgendes festgestellt: Im Bogen wird die Verteilung der Moleküle auf die verschiedenen Rotationszustände entsprechend der Boltzmann-Verteilung gefunden. In der Hohlkathode wird dagegen eine andere Verteilung beobachtet, die als Verteilung der Moleküle auf die verschiedenen Rotationszustände durch den Elementarprozeß der Molekülbildung gedeutet wird, da, wie gezeigt wird, die bisher bekannten Effekte für eine Erklärung nicht in Frage kommen. Gleichzeitig ändert sich auch die relative übergangswahrscheinlichkeit, und die Intensitäten der Linien von einem gemeinsamen Anfangszustand folgen im Gegensatz zum Bogen nicht mehr den Formeln nach Hönl und London. Es wird weiter gezeigt, daß man den Intensitätsverlauf in der Hohlkathode durch eine einfache Beziehung darstellen kann.
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    The European physical journal 108 (1938), S. 739-747 
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    Notes: Zusammenfassung Aus der Hyperfeinstrukturaufspaltung einiger Linien des Al-II-Spektrums wurde mit Hilfe der Land éschen Intervallregel für das mechanische Kernmoment des Aluminiums der WertI=5/2 ermittelt, für das magnetische der WertΜ=3,7 KM. Das Ergebnis wird dem kürzlich (siehe unten) von Jackson und Kuhn angegebenen WertI=9/2 gegenübergestellt und insbesondere bezüglich der etwa möglichen Störungen der Intervallregel diskutiert.
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    The European physical journal 108 (1938), S. 726-738 
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    Notes: Zusammenfassung Von den zahlreichen Forschungsarbeiten auf dem Gebiete der künstlichen Radioaktivitäten betrachten verhältnismäßig wenige solche Stoffe, die durch Aktivieren mit α-Teilchen erzeugt worden sind. Denn einmal bieten die α-Prozesse nicht das ausgedehnte Betätigungsfeld, wie es die Neutronenprozesse wegen der überaus zahlreichen Umwandlungsmöglichkeiten eröffnen, zum andern sind bei ihnen auch die experimentellen Schwierigkeiten größer. —In der vorliegenden Arbeit handelt es sich um die Untersuchung der Umwandlungen: Na (α; Nn)Al und P (α; Nn)Cl. — Das Interesse des Physikers richtet sich bei den Umwandlungsprozessen besonders auf die energetischen Verhältnisse. Daher sind gerade die α-Umwandlungen von Bedeutung, weil man es bei ihnen — in weiterem Maße als bei den Neutronenprozessen — in der Hand hat, mit wohldefinierten Geschoßenergien und -zahlen zu arbeiten. Die beiden genannten Kernreaktionen sind zwar schon lange bekannt, die dabei umgesetzten Energien aber noch nicht näher untersucht worden. Die Arbeit will dazu beitragen, diese Lücke zu schließen. — Nebenbei wird eine Methode angegeben, das spezifische Ionisationsvermögen einzelner Positronen exakt zu bestimmen.
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    The European physical journal 108 (1938), S. 748-770 
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    Notes: Zusammenfassung Es werden die Depolarisationsgrade und die Intensitäten von Raman-Linien bei verschiedenen Kristallstellungen an Kalkspat, Quarz und Beryll untersucht und quantitativ bestimmt. Besonders hervorzuheben ist eine Anordnung, die es ermöglicht, den Polarisationszustand von Raman-Linien auch bei optisch aktiven Substanzen zu messen. Der Vergleich mit der Theorie von Placzek über den Einfluß der Kristallsymmetrie bestätigt die bekannten Zuordnungen der Schwingungen des Kalkspats; Schwierigkeiten ergeben sich nur bei der Pulsation der CO3-Gruppe; diese werden diskutiert. Bei Quarz und Beryll ergeben sich Zuordnungen, die mit der Deutung des ultraroten Silikatspektrums (nach Schaefer, Matossi, Wirtz) in Einklang sind.
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    The European physical journal 108 (1938), S. 771-776 
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    Notes: Zusammenfassung Es wird eine elektronenoptische Methode beschrieben, mit deren Hilfe gleichzeitig ein Ionenemissionsbild und ein Elektronenemissionsbild von emittierenden drahtförmigen Körpern auf demselben Leuchtschirm sichtbar gemacht werden kann. Das Ionenemissionsbild wird dabei zuerst in ein Sekundärelektronenbild umgewandelt. Die Methode wird auf Emissionsuntersuchungen an glühenden Steatitröhrchen angewandt.
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    The European physical journal 108 (1938), S. 777-779 
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    Notes: Zusammenfassung Es wird an Zählrohren versucht, die Zählrohrspannung mit rhythmischen Spannungsstößen zu überlagern; dadurch kann die maximale Stoßzahl der Zählrohre festgestellt werden. Die übereinstimmung mit den Resultaten verschiedener Zählrohrschaltungen wird diskutiert.
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    The European physical journal 108 (1938), S. 780-785 
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    Notes: Zusammenfassung An Kathoden aus K, Mg, Al, Cu, Fe, Ag, Pt wurde untersucht, wie sich die Elektronenablösung durch den Stoß positiver Ionen ändert, wenn die Oberflächen mit Deckschichten insbesondere mit Oxydschichten bedeckt werden. Es zeigte sich, daß dadurch die Elektronenablösung stets vergrößert wird, beispielsweise bei Mg und 2000 Volt fast auf den fünffachen Wert. Mit Hilfe dieses Verhaltens kann der Vorgang der Beseitigung einer Oxydschicht durch Kathodenzerstäubung oder ihre Neubildung durch Einführen von Sauerstoff oder analog auch einer Hydridschicht genau verfolgt werden.
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    The European physical journal 108 (1938), S. 137-152 
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    Notes: Zusammenfassung Durch Berücksichtigung der Oberflächenenergie der Wand zwischen entgegengesetzt mägnetisierten Bezirken werden die theoretischen Schwierigkeiten bebeseitigt, die bisher dem Verständnis der Versuche von Sixtus über das Auswachsen der Ummagnetisierungskeime bei den großen Barkhausen-Sprüngen entgegenstanden. Durch Auswertung der Messungen von Sixtus wird erstmalig eine experimentelle Angabe über die Größe der Wandenergie gewonnen, die in guter Übereinstimmung mit dem von Bloch theoretisch gefundenen Wert ist.
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    The European physical journal 108 (1938), S. 162-167 
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    Notes: Zusammenfassung Durch Verdampfung gewonnene, dünne (0,2–2,5 μ) NaCl-Schichten haben eine sehr große spezifische elektrische Leitfähigkeit mit sehr kleinen Ionenablösungsarbeiten. Es ist eine Abhängigkeit von der Schichtdicke vorhanden.
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    The European physical journal 108 (1938), S. 153-161 
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    Notes: Zusammenfassung Aus der Diffusionsgleichung wird abgeleitet, wie ein Zusatz von Cadmiumsalz zu Wasser die Konzentration von thermischen Neutronen beeinflußt. Die gefundene Beziehung wird durch Experimente bestätigt. Die Messungen ermöglichen die Relativbestimmung des reinen Absorptionsquerschnitts von Wasserstoff bezogen auf den von Cadmium.
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    The European physical journal 108 (1938), S. 168-170 
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    Notes: Zusammenfassung In Hg I wurde eine neue Serie aufgefunden, welche dem Übergang vom Termmd 3,1 D zu einem neuen Term 5d 9 6s 2 6p 3 D 3 entspricht. Über die Lage des Terms 5d 9 6s 2 6p 1 F 3 wurden einige Bemerkungen gemacht.
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    The European physical journal 108 (1938), S. 183-188 
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    Notes: Zusammenfassung Es wird gezeigt, daß die ursprüngliche Form des Nernstschen Wärmesatzes bestehen bleibt, auch wenn es gelingt, den absoluten Nullpunkt zu erreichen.
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    The European physical journal 108 (1938), S. 189-194 
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    Notes: Zusammenfassung Aus dem Drehimpulserhaltungssatz und den Auswahlregeln für Kernumwandlungen wird die Winkelverteilung der Kerntrümmer gefolgert. Die Ergebnisse werden an den Prozessen H2(d; p) H3, H2(d; n) He3, Li6 (d; p) Li7, Li6 (p; α)He3, Li7 (p; α) He4, B11(p; α) Be8 geprüft.
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    The European physical journal 108 (1938), S. 171-182 
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    Notes: Zusammenfassung Mit einer Ionisationskammer von 20,5 Liter Inhalt, die mit Preßluft gefüllt war, wurden Untersuchungen über die Druckabhängigkeit der Ionisation durch Ultrastrahlung in dem Bereich von Normaldruck bis 37 Atm. durchgeführt. Die Messungen ergaben, daß sich die Ionisation aus zwei Komponenten, einer energiereichen Primärstrahlung und einer energieärmeren Sekundärstrahlung, die in den Kammerwandungen ausgelöst wird, zusammensetzt. Durch Berücksichtigung der auf rechnerischem Wege erhaltenen Restionisation der verwendeten Ionisationskammer und des Sättigungsgrades der Kammerspannung konnte ein eindeutiger Verlauf der Ionisationsstrom-Druckkurven gegeben werden. — Die Druckabhängigkeit der Ionisation durch Ultrastrahlung ist von der durch γ-Strahlung in dem untersuchten Druckbereich bis 37 Atm. verschieden. — Durch Verwendung von Absorptionsmaterialien (Blei, Aluminium, Eisen) in der Druckkammer konnte die Bildung einer Sekundärstrahlung von geringer Energie nachgewiesen werden. Reichweite und Intensität der ausgelösten Sekundärstrahlung ergaben bei den einzelnen Absorptionsmaterialien ein grundsätzlich verschiedenes Bild.
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    The European physical journal 108 (1938), S. 195-199 
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    Notes: Zusammenfassung Die Dämpfung piezoelektrischer Schwingungen einer Quarzplatte wird mit Hilfe einer neuen Methode untersucht. Die Verwendung einer Braunschen Röhre gestattet den Abklingvorgang eines elektrisch in seiner Eigenfrequenz erregten und dann frei ausschwingenden Piezokristalls photographisch aufzunehmen. Die Dämpfung nimmt mit sinkender Temperatur stark ab und erreicht bei −100° C einen annähernd konstanten Wert.
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    The European physical journal 108 (1938), S. 200-203 
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    Notes: Zusammenfassung Dieser wird erzeugt von den Erweiterungen eines hyperkomplexen Zahlsystems 1), welches der Verfasser als Angelpunkt aller quantenmechanischen Matrizensysteme erkannt hat. Die neue Raum-Zeit-Struktur wird angegeben. Zu ihrer Eichung benötigt man drei Meßwerte (g, cm, sec). Die physikalischen Konstanten sind hierauf theoretisch berechenbar. Im besonderen werden Eigenschaften der Elementarteilchen quantitativ erfaßt.
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    The European physical journal 108 (1938), S. 212-217 
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    Notes: Zusammenfassung Es wurden mit drei verschiedenen Anordnungen Messungen angestellt über das Zahlenverhältnis der nicht-ionisierenden zu den ionisierenden Strahlen in einem kosmischen Ultraschauer. Die ionisierenden Strahlen wurden dabei durch das Auftreten von Koinzidenzen, die nicht-ionisierenden durch das Ausbleiben von Koinzidenzen festgestellt. Es ergab sich, daß mit jedem Elektronenschauer ein relativ intensiver und stark diffuser Photonenschauer verkoppelt ist. Es entfallen in einem Schauer auf ein Elektron rund 50 Photonen.
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