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Browsing ELibrary by Title
Now showing items 10260-10279 of 21821
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(2001)The diffraction of SH waves by a finite plane crack is studied. The classical Sommerfeld solution for a semi-infinite straight reflecting screen is used as a building block to calculate the diffracted field generated by a ...
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SCATTERING ATTENUATION IN RANDOMLY LAYERED STRUCTURES WITH FINITE LATERAL EXTENT: A HYBRID Q MODEL (2004)Since the pioneering work of O'Doherty and Anstey (1971), much research has been devoted to understand the effect of stratigraphic filtering of seismic waves, i.e., the problem of multiple scattering in 1D random structures ...
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(2004)The variation of scattering attenuation ratios of P and S waves (Q -1 P /Q -1 S ) is investigated in elastic media by using numerical simulations and theoretical expressions based on the first-order Born approximation. ...
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(2002)Analytical expressions for scattering coefficients for S-wave incidence have been derived for the medium defined by the exponential correlation function. Low- and high-frequency asymptotic characteristics of the total ...
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(2004)Multiple scattering is a phenomenon generic to wave propagation in heterogeneous media. In order to study scattering effects caused by inhomogeneities within an elastic medium we use the direct solution method (DSM). This ...
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(2004)Radio wave scintillations are rapid fluctuations in both amplitude and phase of signals propagating through the atmosphere. GPS signals can be affected by these disturbances which can lead to a complete loss of lock when ...
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SCLEROSPONGES AS A NEW POTENTIAL RECORDER OF ENVIRONMENTAL CHANGES: LEAD IN CERATOPORELLA NICHOLSONI (2000)Lead concentrations have been analyzed on a 223 yr profile through the aragonitic skeleton of the reef-building Caribbean sclerosponge Ceratoporella nicholsoni by using laser-ablation inductively coupled plasma-mass ...
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(2002)New scorpionflies of the family Liassophilidae, Izjumus ukrainensis gen. et sp. nov. and Garazhovka triassica gen. et sp. nov., are described from the Triassic locality of Garazhovka, Ukraine.
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(2002)This paper develops mass fraction models for transport and fate of agricultural pollutants in structured two-region soils. Mass fraction index models, based on a semi-infinite domain solution, are derived that describe ...
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(2002)The Riphean (1500-1450 to 1000-950 Ma, Ar-40/Ar-39, K/Ar) section of petroliferous peritidal carbonates in the Baikit uplift (western Siberian Platform) contains five sequences, each divided into three to five subsequences, ...
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(2001)Middle and Late Cretaceous paleogeography of the Great Urals is considered. Emphasis is placed on the sea basins existing in region. A nomenclature of basins is proposed. The temporal variations in their outlines and areas ...
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(1989)The Komandorskiy Basin in the western Bering Sea is bounded on the south by the Komandorskiy segment of the Aleutian island arc and on the east by the Shirshov Ridge, and is regarded as a marginal basin of the type formed ...
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(2000)The aim of this study was to identify pathways and processes of modern sediment transport from the Siberian hinterland to the Laptev Sea and further to the Arctic Ocean. Clay mineral analyses were performed on riverine ...
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(2000)Observations from 145 submersible dives are used to create a database of mid-ocean ridge scarp topography and lithology. Seafloor lithologies are classified into extrusives, basaltic talus, dykes, gabbros and serpentinites, ...
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(1997)Alteration of surficial marine basalts at low temperatures (<40°C) is a potentially important sink for atmospheric CO2 over geologic time. Petrologic analyses, thermodynamic calculations, and experimental weathering results ...
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(2004)We propose a new test of the critical earthquake model based on the hypothesis that precursory earthquakes are `actors' that create fluctuations in the stress field which exhibit an increasing correlation length as the ...
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(2006)Tellurium isotope data acquired by multiple-collector inductively coupled plasma-mass spectrometry (MC-ICPMS) are presented for sequential acid leachates of the carbonaceous chondrites Orgueil, Murchison, and Allende. ...
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(2001)Indications of lower mantle discontinuities have been debated for decades, but still little is known about their properties, and their origins are enigmatic. In our study broad-band recordings of deep events are examined ...
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(2003)A study of the isotopic composition of organic matter was conducted in a freshwater marsh over seasonal and diel time scales to determine the sources of dissolved organic matter (DOM) and the processes leading to its ...
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(1996)Monthly monitoring of water chemistry at Octopus Spring, Yellowstone National Park, reveals no changes in the chemical composition over this eight-month study. Differences in silica deposition are attributed to flow dynamics ...
Now showing items 10260-10279 of 21821