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Mathematical Notes - 相似文献
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The specific heat C
total of crystalline and amorphous Eu2(MoO4)3 is measured in the temperature interval 4.5–30 K. The amorphous state is obtained by applying pressure ∼7 GPa at room temperature.
It is found that the specific heat of the crystal at T⩽7.5 K is described by a cubic function of temperature, while the specific
heat of the amorphous sample has a strongly non-Debye character in the entire experimental temperature interval. The curve
of C
total for amorphous europium molybdate is analyzed in a model of soft atomic potentials, and it is shown that it agrees well with
universal low-temperature anomalies of the specific heat of classical glasses obtained by quenching from the liquid.
Pis’ma Zh. éksp. Teor. Fiz. 68, No. 8, 623–627 (25 October 1998) 相似文献
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V. M. Red’kov 《Advances in Applied Clifford Algebras》2011,21(1):203-220
Some facts of the theory of the Lorentz group are specified for looking at the problems of light polarization optics in the
frames of vector Stokes-Mueller and spinor Jones formalism. In view of great differences between properties of isotropic and
time-like vectors in Special Relativity we should expect principal differences in describing completely polarized and partly
polarized light. In particular, substantial differences are revealed when turning to spinor techniques in the context of the
polarized light. 相似文献
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Phonon thermal conductivities κ22 (?T ‖ C1) and κ33 (? T ‖ C3) of tellurium-doped bismuth with an electron concentration in the range 1.8 × 1019 ≤ nL ≤ 1.4 × 1020 cm?3 were studied in the temperature interval 2 < T < 300 K. The temperature dependence of the phonon thermal conductivity obtained on doped bismuth samples of both orientations exhibits two maxima, one at a low temperature and the other at a high temperature. The effect of various phonon relaxation mechanisms on the dependence of both phonon thermal conductivity maxima on temperature, impurity concentration, and electron density is studied. 相似文献
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S. S. Grazhulene A. N. Red’kin G. F. Telegin A. V. Bazhenov T. N. Fursova 《Journal of Analytical Chemistry》2010,65(7):682-689
A correlation between the temperature of the synthesis of carbon nanotubes (CNT) by method of catalytic pyrolysis from ethanol on a nickel catalyst and their ability for the modification of oxidation under
various conditions and also their adsorption capacity to a number of metal ions is demonstrated. The study of infrared spectra
in correlation with the total acidity of the CNT synthesized and modified under various conditions has shown that the samples
synthesized at 400°C possess the maximum ability for modification. This can be explained by the higher deficiency of their
structures at low synthesis temperatures. Adsorption isotherms of silver, copper, lead, cadmium, zinc, iron, and magnesium
ions under batch and dynamic modes were studied, depending on pH and element concentration in the solution. It was found that
CNT synthesized at 400°C and treated with conc. HNO3 in an autoclave at 110–120°C possess the maximum adsorption capacity of all the studied elements, which exceeds the capacity
of active coal, traditionally used for these purposes, by several times. The attained adsorption capacity is 5–10 times higher
than that reported in the literature for carbon nanotubes in relation to the same elements. Prospects of using CNT as collectors
for the preconcentration of trace impurities in spectroscopic methods of analysis are considered. 相似文献
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A. A. Sorokin V. P. Gar’kin N. S. Red’kin A. K. Buryak 《Russian Journal of Applied Chemistry》2010,83(12):2163-2167
Various types of ionization of organotellurium compounds in mass-spectrometric study are considered, with diphenyl telluroxide
as example. The mass spectra of diphenyl telluroxide are presented. The possibility of applying surface-activated and matrix-assisted
laser desorption/ionization mass spectrometry to organotellurium compounds is examined. 相似文献
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V. M. Red’kov N. G. Tokarevskaya George J. Spix 《Advances in Applied Clifford Algebras》2013,23(1):165-178
The Riemann–Silberstein–Majorana–Oppenheimer approach to the Maxwell electrodynamics in the presence of electrical sources, arbitrary media and curved space-time is investigated within the matrix formalism and tetrad method. Symmetries of the matrix Maxwell equation under transformations of the local gauge complex rotation group SO(3,C) is demonstrated explicitly. Equivalence of the approach to general covariant Proca technique and spinor formalism is shown. 相似文献
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