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  • 1
    Keywords: alluvial fans; clastic rocks; clastic sediments; geomorphology; sedimentation
    Description / Table of Contents: Alluvial fans: geomorphology, sedimentology, dynamics — introduction. A review of alluvial-fan research / Adrian M. Harvey, Anne E. Mather and Martin Stokes / Geological Society, London, Special Publications, 251, 1-7, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.01 --- Flow events on a hyper-arid alluvial fan: Quebrada Tambores, Salar de Atacama, northern Chile / Anne E. Mather and Adrian Hartley / Geological Society, London, Special Publications, 251, 9-24, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.02 --- Fans with forests: contemporary hydrogeomorphic processes on fans with forests in west central British Columbia, Canada / D. J. Wilford, M. E. Sakals, J. L. Innes and R. C. Sidle / Geological Society, London, Special Publications, 251, 25-40, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.03 --- The fluvial megafan of Abarkoh Basin (Central Iran): an example of flash-flood sedimentation in arid lands / Nasser Arzani / Geological Society, London, Special Publications, 251, 41-59, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.04 --- Climate and tectonically controlled river style changes on the Sajó-Hernád alluvial fan (Hungary) / Gyula Gábris and Balázs Nagy / Geological Society, London, Special Publications, 251, 61-67, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.05 --- Quaternary telescopic-like alluvial fans, Andean Ranges, Argentina / F. Colombo / Geological Society, London, Special Publications, 251, 69-84, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.06 --- Morphometry and depositional style of Late Pleistocene alluvial fans: Wadi Al-Bih, northern UAE and Oman / Asma Al-Farraj and Adrian M. Harvey / Geological Society, London, Special Publications, 251, 85-94, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.07 --- Climatic controls on alluvial-fan activity, Coastal Cordillera, northern Chile / Adrian J. Hartley, Anne E. Mather, Elizabeth Jolley and Peter Turner / Geological Society, London, Special Publications, 251, 95-116, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.08 --- Differential effects of base-level, tectonic setting and climatic change on Quaternary alluvial fans in the northern Great Basin, Nevada, USA / Adrian M. Harvey / Geological Society, London, Special Publications, 251, 117-131, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.09 --- Reconciling the roles of climate and tectonics in Late Quaternary fan development on the Spartan piedmont, Greece / Richard J.J. Pope and Keith N. Wilkinson / Geological Society, London, Special Publications, 251, 133-152, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.10 --- Luminescence dating of alluvial fans in intramontane basins of NW Argentina / R. A. J. Robinson, J. Q. G. Spencer, M. R. Strecker, A. Richter and R. N. Alonso / Geological Society, London, Special Publications, 251, 153-168, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.11 --- Factors controlling sequence development on Quaternary fluvial fans, San Joaquin Basin, California, USA / G. S. Weissmann, G. L. Bennett and A. L. Lansdale / Geological Society, London, Special Publications, 251, 169-186, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.12 --- Tertiary alluvial fans at the northern margin of the Ebro Basin: a review / Gary Nichols / Geological Society, London, Special Publications, 251, 187-206, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.13 --- Source area and tectonic control on alluvial-fan development in the Miocene Fohnsdorf intramontane basin, Austria / Michael Wagreich and Philipp E. Strauss / Geological Society, London, Special Publications, 251, 207-216, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.14 --- Upper Cretaceous-Palaeocene basin-margin alluvial fans documenting interaction between tectonic and environmental processes (Provence, SE France) / S. Leleu, J.-F. Ghienne and G. Manatschal / Geological Society, London, Special Publications, 251, 217-239, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.251.01.15
    Pages: Online-Ressource (248 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781862394995
    Language: English
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  • 2
    ISSN: 0378-4347
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 431 (2004), S. 414-414 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] High-latitude polar deserts are among the most extreme environments on Earth. Here we describe a large and previously unappreciated habitat for photosynthetic life under opaque rocks in the Arctic and Antarctic polar deserts. This habitat is created by the periglacial movement of the rocks, ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillian Magazines Ltd.
    Nature 418 (2002), S. 839-844 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Breaking ocean waves entrain air bubbles that enhance air–sea gas flux, produce aerosols, generate ambient noise and scavenge biological surfactants. The size distribution of the entrained bubbles is the most important factor in controlling these processes, but little is known about bubble ...
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 2013-08-31
    Description: An old and proven grid generation code, the EAGLE grid generation package, is given an added dimension of a graphical interface and a real time data base manager. The Numerical Aerodynamic Simulation (NAS) Panel Library is used for the graphical user interface. Through the panels, EAGLEView constructs the EAGLE script command and sends it to EAGLE to be processed. After the object is created, the script is saved in a mini-buffer which can be edited and/or saved and reinterpreted. The graphical objects are set-up in a linked-list and can be selected or queried by pointing and clicking the mouse. The added graphical enhancement to the EAGLE system emphasizes the unique capability to construct field points around complex geometry and visualize the construction every step of the way.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Langley Research Center, Software Surface Modeling and Grid Generation Steering Committee; p 243-252
    Format: application/pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 41 (1992), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A southern stingray from the shallow sand flats of Tampa Bay, Florida, had its gut filled almost exclusively with lancelets. The absence of small lancelets from the gut contents indicated a pharyngeal sieving mechanism by the ray.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report in this letter the observation of folded acoustic phonons in hydrogenated nanocrystalline silicon/amorphous silicon multilayers with visible emission, which are prepared in a plasma enhanced chemical vapor deposition system. In the low-frequency range of 10–100 cm−1, the obtained Raman spectra clearly show some folded doublets from longitudinal acoustic phonons. Using the elastic continuum model, we calculated their frequencies and the obtained results were in agreement with the experimental ones. In addition, some broad folded doublets and additional peaks were clearly observed in the sample with thin nancorystalline sublayers. We attributed them to the mixing of longitudinal and transverse acoustic phonons due to the layered structure. A confined acoustic mode was also proposed to be responsible for the strongly folded longitudinal acoustic phonon peak at 61 cm−1. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-1480
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Models of the climatic perturbation caused by a large scale extraterrestrial impact predict an injection of dust into the stratosphere. This would cause the onset of environmental conditions whose two principal characteristics are a prolonged period of darkness and reduced global temperatures. Similar scenarios follow large scale volcanic eruptions, wildfires and they are predicted for a nuclear winter following a protracted nuclear exchange. A significant drop in temperature and solar insolation are also characteristics of the polar winter. In this paper the onset and emergence from the polar winter is examined as a potential biological framework for studying immediate biological effects following transition into and out of a dark/cold catastrophe. Limitations of the conceptual model, particularly with respect to the fact that polar organisms are well adapted to a regular and severe dark/cold climatic change (which the rest of the Earth's biota is not) are discussed. The model has implications for the poles as an extinction refuge during such climatic changes.
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 2002-01-01
    Description: The Aguas/Feos river system of the Sorbas Basin, SE Spain was captured by an aggressive subsequent stream c. 100 ka. The consequence of the capture event was twofold: (1) basin-scale drainage reorganization via beheading of the southward flowing Aguas/Feos system and re-routing the drainage eastwards into the Vera Basin; and (2) the creation of a new, lower base level and associated upstream propagation of a wave of incision. The sequence of pre- and post-capture events are well established from previous studies of the Quaternary terrace record. Using these studies, this paper makes the first attempt to quantify the impact of river capture in terms of spatial and temporal variations in rates of incision, sediment flux and surface lowering. This was carried out through construction of 43 valley cross-sections from the captured' (Upper Aguas), beheaded' (Feos) and capturing' streams (Lower Aguas) within the central-southern parts of the Sorbas Basin. Dated pre- and post-capture terrace and corresponding strath levels were plotted on to the valley cross-sections enabling incision amounts, rates and valley cross-sectional areas to be calculated. Sediment fluxes were calculated using a mean valley section method. Surface lowering calculations were made through reconstruction of the top basin-fill surface and subtraction from the modern contour values. The lowering of base level has resulted in a dramatic increase in incision upstream of the capture site by a factor of 4 to 20. This in turn has been associated with significant pre- and post-capture changes in valley shape. The increased incision resulted in dramatic post-capture increases in valley erosion upstream and downstream of the capture site by a factor of 2 to 9 which can be related to changes in associated stream power as a function of increased gradient and discharge. In excess of 60% of the landscape change can be accounted for by valley-constrained erosion as opposed to overall surface lowering.
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  • 10
    Publication Date: 2015-07-07
    Description: The mineralogical complexity of mudstone reservoirs has led to the increased usage of multimineral optimizing petrophysical models for estimating porosity, water, and hydrocarbon volumes. A key uncertainty in these models is the log response parameter assigned for each log equation related to each volumetric variable. Default parameter values are commonly used and often need to be modified by considering subjective local knowledge or intuition to achieve a result that is considered acceptable. This paper describes the methods developed at Chevron for calibration of mineral log response parameters using core data. Mineral log response parameters are controlled by the major and trace element chemistry of the individual minerals in the formation rock matrix. BestRock™ uses a nonlinear approach to optimize whole-rock chemistry with mineralogy to calculate individual mineral structural formulas and trace element associations from which certain log response parameters can then be calculated. Accurate quantitative phase analysis (QPA) to determine mineral content is a critical step in the process, which is achieved here by rigorous sample preparation methods and QPA by x-ray diffraction (QXRD). The QXRD in combination with whole-rock elemental analyses are processed using Chevron’s BestRock optimization software to provide refined quantities of the mineral species present in the formation, their structural formulas, and their predicted wireline log responses. Calibrated petrophysical models are built from the information obtained from the QXRD and BestRock results. The method described herein provides an independent and robust method for determining petrophysical parameters that is independent of the interpreter, quick to implement, and supported by quantitative measurements.
    Print ISSN: 0149-1423
    Electronic ISSN: 0149-1423
    Topics: Geosciences
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