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Now showing items 12677-12696 of 39126
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(1995)The results of scanning calorimetric measurements on crystalline albite, diopside, diopside-anorthite, and diopside-wollastonite-enstatite are reported in the temperature range of 1300 K to 1775 K. The results for albite ...
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(2004)Scanning electron microscopy (SEM) was used to investigate grain texture and pore structure development within various compositions of pure sI and sII gas hydrates synthesized in the laboratory, as well as in natural samples ...
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(1997)Chemical exchange between coexisting scapolite and plagioclase was studied for both a set of natural pairs from a regionally metamorphosed terrain (450-670°C, 3.5-6 kbar) in northern Idaho and for eight synthetic pairs ...
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(PANGAEA, 2011-12-02)Aim: Concepts about patterns and rates of post-glacial tree population migration are changing as a result of the increasing amount of palaeobotanical information being provided by macroscopic plant remains. Here we combine ...
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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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(Федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет», 2018)A rationale for the set of theoretical and methodological techniques of mapping and deep modeling in the Russian Arctic shelf and adjacent sedimentary basins in continental Russia is based on the materials for the Barents ...
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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 ...
Now showing items 12677-12696 of 39126