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Browsing ELibrary by Title
Now showing items 5620-5639 of 21253
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(1999)The detailed morphology of impact craters is now believed to be mainly caused by the collapse of a geometrically simple, bowl-shaped "transient crater." The transient crater forms immediately after the impact. In small ...
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(1990)Since the accretion model is now generally accepted in the current cosmogony of the planets, the problem of the transformation of their material amounts to determining the main mechanism of accumulation, with all the ...
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(2002)Most of the 3-mm-thick globally distributed Chicxulub ejecta layer found at the Cretaceous-Tertiary (K-T) boundary was deposited as condensation droplets from the impact vapor plume. A small fraction of this layer (<1%) ...
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(2002)There is a modern-day hazard, threatening the existence of civilization, from impacts of comets and asteroids larger than 1.5 km diameter. The average annual world fatality rate is similar to that due to significant accidents ...
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(2001)The impact of carbo-gazeous saline spring waters, rich in Ca, Fe, As and P and chemically stable through time, on the chemistry (major and trace elements) and mineralogy of soils developed from anatexite is presented. The ...
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(2001)Stream-water samples were collected during a 4-year-period in two small streams, one whose catchment was ditched for forestry halfway through the sampling period and another nearby reference stream whose catchment was not ...
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(2001)High-resolution analyses of rock magnetic and sedimentological parameters were conducted on an 11m long sediment core from Lama Lake, Northern Siberia, which encompasses the late Pleistocene and the Holocene epochs. The ...
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(2001)It is crucial to analyze the sensitivity of watershed (rainfall-runoff) models to imperfect knowledge of rainfall input, in order to judge whether or not they are reliable and robust, especially if they are to be used for ...
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(2004)The viscous flow in the outer core induced by inner core rotation relative to the mantle is computed under the geostrophic approximation for a simple Earth model having a homogeneous, incompressible and viscous outer core. ...
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(2002)Fluxes of particulate organic carbon (POC) through the oxygen deficient waters in the eastern tropical North Pacific were found to be relatively less attenuated with depth than elsewhere in the eastern North Pacific. The ...
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(2004)The paper presents an overview of the scientific research carried out in the frames of Working Group 1 activities of the COST Action 271. The basic objective of this Working Group was the study of the impact of ionospheric ...
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(1996)Asteroids and comets that are vaporized during hypervelocity impact events can inject large masses of S into the stratosphere where it can potentially affect the radiation budget of the Earth, alter the chemistry of the ...
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(2003)Many papers on meteorite impact suggest that large impacts can induce volcanic eruptions through decompression melting of the underlying rocks. We perform numerical simulations of the impact of an asteroid with a diameter ...
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(1995)Imperfections in the perfect fractional melting (PFM) process can ameliorate the drastic “stripping” of incompatible trace elements from the residue which characterises ideal PFM, and the consequent catastrophic collapse ...
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(1993)Noble gases were extracted in steps from grain size fractions of microdiamonds (less than 100 microns) from the Kokchetav Massif, Northern Kazakhstan, by pyrolysis and combustion. The concentration of He-4 in the diamonds ...
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(2003)This paper investigates whether a micromechanical model developed to investigate the relation between the basic failure processes at grain-scale and the macroscopic failure pattern can be applied to model the fracturing ...
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(2003)We analyse the effect of uneven ray coverage in global surface wave tomography. An inhomogeneous distribution of seismic rays may bias tomographic models because certain areas are better sampled than others. It is possible ...
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(1997)Experimental partitioning of platinum-group elements (PGE) Os, Ir, Ru, Pt, and Pd, and Au between (Fe, Ni)-sulfide liquid and basaltic melt have been carried out at high Ni content with 67 ± 1 mol% NiS and 50 to 400 ppm ...
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(2004)Based on elementary molecular-chemical concepts, one can trace the evolution of the gaseous phase of an endogenic fluid at its temperature equilibrium with host rocks. As can be seen, the final result of this evolution ...
Now showing items 5620-5639 of 21253