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Browsing by Title
Now showing items 10005-10024 of 39068
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(1991)Five novel ethylene-linked polymethyl-substituted phenyl/naphthyl or naphthyl/naphthyl hydrocarbons have been identified in aromatic hydrocarbon fractions of immature Tertiary coals using liquid chromatography, gas ...
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(2003)The main developments taking place in Nuclear Magnetic Resonance Spectroscopy (NMR) of quadrupolar (spin 1 > 1/2) nuclei with half integer spins in solids, particularly clays and other layered materials, have been reviewed. ...
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(2005)Stable isotopes and trace elements in foraminifera shells are important for determining the paleochemistry of the ocean, and Mg/Ca ratios and delta(18)O values in foraminifera have recently been used to determine simultaneously ...
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(1996)Five out of seven marine microalgal species investigated were found to biosynthesize nonhydrolysable, mainly aliphatic, biomacromolecules (algaenans). The molecular structure of the algaenan isolated from the microalga ...
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(2006)Новое плауновидное Novgorodendron conophorum gen. et sp. nov., по морфологии листовых подушек занимающее промежуточное положение между семействами Sublepidodendraceae Chaloner et Boureau и Lepidodendraceae Endlicher, описано ...
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(2001)Based on tephrochronological studies the Novo-Bakening Volcano was dated Early Holocene, and its Holocene activity was reconstructed. A composite section was compiled for the tephra of the area with the description of ...
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(2004)The paper reviews the work done in the course of the COST 271 Action concerned with the development of tools and methods for forecasting, nowcasting and warning of ionospheric propagation conditions. Three broad categories ...
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(1997)When Li-saturated montmorillonite is heated to 200-300 ~ the Li ions migrate from inter- layer positions to sites in the layer structure. However, the identity of these sites has not been clearly established. Here we have ...
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(2002)The proton Magnetic Resonance Sounding (MRS) is a geophysical technique specially designed for hydrogeological applications. It is based on the principle of Nuclear Magnetic Resonance (NMR) and allows the non-invasive ...
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(2003)Zunyite [Al13Si5O20(OH,F 18Cl] possesses an unusual combination of an Al13O16(OH)24 Keggin structure and a Si5O16 pentamer unit. We used 19F, 27Al, 29Si MAS and 27Al MQMAS NMR spectroscopy of a series of samples with varying ...
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(2004)This review describes nuclear waste forms for high-level waste (HLW), that is, glasses, ceramics, and glass-ceramics, as well as for low- and intermediate-level waste (LILW), that is, cement, bitumen, glass, glassy slags, ...
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(1989)When gold interacts under natural conditions with microorganisms, it is either concentrated, or dispersed. Our experiments have already shown that heterotrophic microorganisms can generate 'new' gold both on its original ...
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(1998)The micro-inclusions located in the genetic centre of Yakutian diamond monocrystals have been studied using optical (anomalous birefringence, photoluminescence, cathodoluminescence) and microanalytical (electron-microprobe, ...
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(1997)Crystals of (Ba,Sr)CO3, Ba(SO4,CrO4), (Ba,Sr)SO4, and (Cd,Ca)CO3 solid solutions were obtained by counterdiffusion of reactants through a column of porous silica hydrogel. For each system, a set of experiments, starting ...
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(2005)Stepwise dissolutions of the carbonaceous chondrites Orgueil (CI), Murchison (CM) and Allende (CV) reveal large nucleosynthetic anomalies for Zr isotopes that contrast with the uniform compositions found in bulk meteorites. ...
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(2004)The strong uncertainty inherent in the traveltime inversion of first arrivals from surface sources is usually removed by using a priori constraints or regularization. This leads to the -space (data-independent model ...
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(2004)The total number of oil and gas pools in a province is approximated by the Weibull distribution. The statistical performances of this number are related to the parameters of a truncated Pareto distribution. The total number ...
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(2002)This paper uses the concept of anisotropic damage mechanics to analyze dynamic responses of a granite site under blasting loads. An anisotropic continuum damage model is suggested to model rock mass behavior under blasting ...
Now showing items 10005-10024 of 39068