Showing papers by "Moscow State University published in 1984"
TL;DR: In this article, the authors consider the experimental and theoretical studies of concentrated Kondo systems (CKS), Kondo lattices, substitutional solid solutions and their transition from Kondo impurity to Kondo-lattice, and intermediate valence compounds.
Abstract: This review considers the experimental and theoretical studies of concentrated Kondo systems (CKS), Kondo lattices, substitutional solid solutions and their transition from Kondo impurity to Kondo lattice, and ‘intermediate valence compounds’ which are, in fact, high T K CKS (T K is the Kondo temperature). The anomalous low temperature properties of CKS are related to the formation of the narrow (∼k B T K) high-amplitude Abrikosov-Suhl resonance E R in the vicinity of the Fermi level E F. This resonance is situated exactly at E F in low T K CKS with T K ΔCF (ΔCF is the crystal field splitting). In low T K ‘j=1/2’ CKS the condition E R=E F leads to an increase of the density of states at E F, which is large enough to induce heavy fermion superconductivity in CeCu2Si2, UBe13. We demonstrate that the transition from low T K (E R=E F) to high T K CKS (E R≠E F) might be what was formerly considered as a ‘Kondo-lattice-intermediate valence state’ transition...
338 citations
286 citations
01 Jan 1984
TL;DR: In this article, the synthesis, structure and properties of thermotropic liquid-crystalline polymers with mesogenic side groups are discussed, as well as the conditions for their realization in the LC state.
Abstract: The article covers synthesis, structure and properties of thermotropic liquid-crystalline (LC) polymers with mesogenic side groups Approaches towards the synthesis of such systems and the conditions for their realization in the LC state are presented, as well as the data revealing the relationship between the molecular structure of an LC polymer and the type of mesophase formed Specific features of thermotropic LC polymers and copolymers of nematic, smectic and cholesteric types are considered
200 citations
TL;DR: In this paper, notations and faits provenant du calcul differentiel dans des algebres commutatives are provenant in the form of notations, faits, and specifications.
194 citations
TL;DR: In this article, the basic notions of the higher symmetries theory for arbitrary systems of partial differential equations as well as the necessary calculation procedures are explained and the cohomological nature of conservation laws is shown and some basic results are exposed which allow one to calculate, in principle, all conservation laws for a given system of PDE.
Abstract: Starting with Lie's classical theory, we carefully explain the basic notions of the higher symmetries theory for arbitrary systems of partial differential equations as well as the necessary calculation procedures Roughly speaking, we explain what analogs of ‘higher KdV equations’ are for an arbitrary system of partial differential equations and also how one can find and use them The cohomological nature of conservation laws is shown and some basic results are exposed which allow one to calculate, in principle, all conservation laws for a given system of partial differential equations In particular, it is shown that ‘symmetry’ and ‘conservation law’ are, in some sense, the ‘dual’ conceptions which coincides in the ‘self-dual’ case, namely, for Euler-Lagrange equations Training examples are also given
185 citations
TL;DR: A comparison of the structure of closely related proteins with different thermostability from various mesophilic sources, and mutationally altered enzymes with those from wild strains has been carried out.
166 citations
TL;DR: In this article, it was shown that a magnetic field is asymptotically (t → ∞) decaying in a flow of finite conductivity with v = Cr, where C = Cζ(t) is a random matrix.
Abstract: A magnetic field is shown to be asymptotically (t → ∞) decaying in a flow of finite conductivity with v = Cr, where C = Cζ(t) is a random matrix. The decay is exponential, and its rate does not depend on the conductivity. However, the magnetic energy increases exponentially owing to growth of the domain occupied by the field. The spatial distribution of the magnetic field is a set of thin ropes and (or) layers.
152 citations
TL;DR: In this article, the notion of covering σ ≥ 0 is introduced for partial differential equations and nonlocal symmetries are defined as transformations of σ ∼ 0 to preserve the underlying contact structure.
Abstract: For a systemY of partial differential equations, the notion of a coveringŶ
∞→Y
∞ is introduced whereY
∞ is infinite prolongation ofY. Then nonlocal symmetries ofY are defined as transformations ofŶ
∞ which conserve the underlying contact structure. It turns out that generating functions of nonlocal symmetries are integro-differential-type operators.
147 citations
TL;DR: In this paper, it was shown that the computation of an arbitrary (L + 1)-loop UV counterterm in the MS-scheme can be substituted by calculation of divergent and finite parts of some properly constructed massless Feynman integrals depending on only one external momentum and with the number of loops not exceeding L.
145 citations
TL;DR: In this article, a random walk on the one-dimensional semi-lattice was considered, and the authors proved that the moving particle walks mainly occur in a finite neighbourhood of a point depending only on time and a realization of the random environment.
Abstract: We consider a random walk on the one-dimensional semi-lattice ℤ={0, 1, 2,...}. We prove that the moving particle walks mainly in a finite neighbourhood of a point depending only on time and a realization of the random environment. The size of this neighbourhood is estimated. The limit parameters of the walks are also determined.
142 citations
TL;DR: In this paper, the equilibrium constants for α-tocopherol interactions with free fatty acids have been determined and the values do not depend in practice on the number of carbon atoms in saturated fatty acid molecules (from 7:0 to 24:0) and are equal to about 40−50 M−1.
TL;DR: Water-soluble nonstoichiometric polyelectrolyte complexes (N-PEC) as mentioned in this paper constitute a new class of macromolecular compounds and are formed as a result of interaction between oppositely charged poly electrolytes taken in non-equivalent rations.
Abstract: Water-soluble nonstoichiometric polyelectrolyte complexes (N-PEC) constitute a new class of polyelectrolytes. N-PEC are formed as a result of interaction between oppositely charged polyelectrolytes taken in non-equivalent rations and thus they are macromolecular compounds. An N-PEC particle can be represented as a macromolecule of a segmented block copolymer. The behaviour of the N-PEC in aqueous-salt media shows their polyelectrolyte nature, but in contrast to ordinary polyelectrolytes, they undergo considerable conformational changes. These transitions precede phase separations, which are unique and are accompanied by the phenomena of disproportionation. Using N-PEC as enzyme carriers it is possible to produce self-regulating systems with a feedback and also thermostable systems, which are the simplest models of a spore. The N-PEC formed by synthetic polyelectrolytes and some proteins, show a pronounced physiological activity and belong to the class of highly immunogenic antigens.
TL;DR: It is suggested that cell transition to transformed phenotype involves shift of an equilibrium between the reactions induced by the two groups of membrane-bound ligands: those attached and those not attached to the substratum.
TL;DR: The WN5 component of V444 Cyg is characterized on the basis of light curves constructed using 1971 OAO observations at 425, 332, 298, and 246 nm and the broadband data at 2.2 and 3.5 microns of Hartmann.
Abstract: The WN5 component of V444 Cyg is characterized on the basis of light curves constructed using 1971 OAO observations at 425, 332, 298, and 246 nm and the broadband data at 2.2 and 3.5 microns of Hartmann (1978). Data and calculation results are presented in tables and graphs and discussed. Parameters estimated include core radius 2.9 solar radii, surface temperature 90,000 K, surface electron density 9 x 10 to the 12th/cu cm, surface outflow velocity 400 km/s, and terminal velocity (at about 10 solar radii) 2500 km/s, suggesting that the flow is He. These results are found to agree with the model of Wolf-Rayet atmospheres proposed by Beals (1929, 1944).
TL;DR: The feasibility of penetration of superoxide radicals through liposomal membrane, predominantly via anionic channels, was demonstrated by the use of an intramolecular cholesterol-amphotericin B complex.
TL;DR: In this article, a model for three composite particles is used to study the ground state of the 6 Li nucleus making allowance for the Pauli principle, and the relevant wave functions are found by solving a set of two-dimensional Hill-Wheeler integral equations on the quadrature Chebyshev grid A nonorthogonal many-dimensional Gaussian basis was taken to be the expansion basis, so that the wave functions obtained could be presented in the form of a superposition of gaussian functions convenient for applications.
TL;DR: This substrate was successfully applied to monitor thiol proteinase affinity chromatography on bacitracin-Sepharose, which resulted in a 2- to 4-fold purification from commercial preparations.
TL;DR: Results point to the physiological role of the embryonic axes during natural or accelerated aging of seeds, notwithstanding that the axis is a small part as compared to the cotyledonary material, and it is suggested that lipid peroxidation in embryonic axes may play an important role in the seed deterioration during aging.
Abstract: Embryonic axes and cotyledons of three soybean (Glycine max L. cv. Gudzon) seed lots designated as “normal”, “naturally aged” and “acceleratedly aged” were analyzed for their organic free radical contents. No signals of free radicals were found in ESR spectra from cotyledonary material of the three samples investigated. High levels of organic free radicals were observed in the embryonic axes. There were significant differences in the free radical contents of the embryonic axes: the relative values of free radicals were 100, 190 and 170% for samples aged normally, naturally and in an accelerated manner, respectively. These results point to the physiological role of the embryonic axes during natural or accelerated aging of seeds, notwithstanding that the axis is a small part as compared to the cotyledons. It is suggested that lipid peroxidation in embryonic axes may play an important role in the seed deterioration during aging.
01 Jan 1984
TL;DR: In this paper, an expression for the matrix element of the S-matrix, or for the transition amplitude between two states, in terms of the path integral is given. But, effective general methods of analytic calculations of these integrals are lacking as yet and one has to resort to approximate ones.
Abstract: In the preceding chapter, the expressions for the vacuum-to-vacuum transition amplitude have been obtained Of practical interest, however, are transitions of a system of initially free particles into a final system of free particles As shown in Sect 11, such transitions are described by the matrix elements of the S-matrix Therefore, we shall find in this chapter an expression for the matrix element of the S-matrix, or for the transition amplitude between two states, in terms of the path integral Unfortunately, effective general methods of analytic calculations of these integrals are lacking as yet and one has to resort to approximate ones Most developed are the methods of perturbation theory representing the transition amplitude as a series in the coupling constant
TL;DR: The protective effect of dicarboxylates on the active-site-directed inhibition of the membrane-bound succinate dehydrogenase by N-ethylmaleimide, steady-state kinetics methods for Ki and Ks determinations, and equilibrium studies were employed to quantify the relative affinities of succinate, fumarate, malonate and oxaloacetate to the reduced and oxidized species of the enzyme.
TL;DR: In this paper, the angular distribution and spin polarisation of Auger electrons following atomic collisions are discussed for the case where both the target atom and the projectile are unpolarised, and general expressions for the angular distributions and polarisation are obtained and analyzed.
Abstract: The angular distribution and spin polarisation of Auger electrons following atomic collisions are discussed for the case where both the target atom and the projectile are unpolarised. General expressions for the angular distribution and polarisation of Auger electrons in the (LS)J coupling approximation are obtained and analysed. In the particular case of the p3/2 subshell vacancy the anisotropy coefficient and polarisation are expressed in terms of Auger-decay matrix elements. It is shown that spin-polarised Auger electron spectroscopy of atoms can provide new information on both the Auger process and the structure of atomic hole states, namely, the Auger-decay matrix elements and their relative phaseshifts.
TL;DR: In this article, an experiment was proposed for measuring the earth's gravitomagnetic field by monitoring its effect on the plane of swing of a Foucault pendulum at the south pole ("dragging of inertial frames by earth's rotation").
Abstract: An experiment is proposed for measuring the earth's gravitomagnetic field by monitoring its effect on the plane of swing of a Foucault pendulum at the south pole ("dragging of inertial frames by earth's rotation"). With great effort a 10% experiment in a measurement time of several months might be achieved.
TL;DR: In this paper, the authors studied the properties of the Kondo-lattice compound CeCu2Si2 and found that it exhibits a superconducting transition at 0.5 K.
Abstract: Electric, magnetic, and thermoelectric properties of Ce
x
La1−x
Cu2Si2 (0⩽x⩽1) compounds have been studied over a wide temperature interval 0.04 ⩽T⩽300 K in magnetic fieldsH⩽40 kOe. The paramagnetic-magnetic ordering transition temperatureT
M
is found to rise from ∼0.32 K for cerium concentrationx=0.2 to 1.6 K forx=0.6. A further increase inx from ∼0.8 to 1.0 leads to a decrease inT
M
. Simultaneously, the susceptibility kink is smeared out and atx≈1.0 it is transformed into temperature-independent enhanced Pauli paramagnetism. The magnetic phase diagram has been found to be similar to that proposed by Doniach for the one-dimensional Kondo-necklace model. The Kondo-lattice compound CeCu2Si2 exhibits a superconducting transition atT
c
⋍0.5 K. The variation of the magnetic properties of Ce
x
La1−x
Cu2Si2 from magnetic ordering at 0.2≲x≲0.8 to the nonmagnetic superconducting state atx → 1.0 is caused by the crossover from the magnetic regimeT
RKKY≫T
K (in which the RKKY temperatureT
RKKY exceeds the Kondo temperatureT
K) to the nonmagnetic singlet ground state corresponding to the situation whenT
K≫T
RKKY. This crossover is accompanied by a sharp increase in the low-temperature Hall coefficientR
H(T) in Ce
x
La1−x
Cu2Si2 compounds atx → 1. At the same time, a minimum of the negative Seebeck coefficient with a high amplitude appears at 10p
KL, a continuous transition from the Kondo lattice to the intermediate valence state is observed, which is accompanied by a complete smearing out of the resonance near the Fermi level. Therefore the Kondo lattices represent a new class of solids, which can be characterized as the link between stable magnetism of metals with a deep 4f level and unstable magnetism associated with fluctuating valence. This novel state can be described by a set of anomalous low-temperature properties related to the giant Abrikosov-Suhl resonance near the Fermi level.
TL;DR: In this paper, the influence of quantum fluctuations on the magnon spectrum of helimagnets is investigated, and it is shown that quantum effects result in the shift of the helix wavevector value, while the general structure of the spectrum, i.e. the existence of the two Goldstone modes, remains unchanged.
Abstract: The influence of quantum fluctuations on the magnon spectrum of helimagnets is investigated. It is shown that quantum effects result in the shift of the helix wavevector value, while the general structure of the spectrum, i.e. the existence of the two Goldstone modes, remains unchanged.
Journal Article•
TL;DR: The cytoskeleton structure of the central (endoplasm) region of the cell was markedly different from that of the lamelloplasm, and sites of microfilament bundle convergence can be visualized near the nucleus after partial removal of the sheath by more complete detergent extraction.
TL;DR: In this paper, the authors used the binary collision cascade computer program OKSANA to simulate the sputtering of Cu single-crystal and polycrystal targets by 27 keV Ar ions.
Abstract: Sputtering of Cu single-crystal and polycrystal targets by 27 keV Ar ions has been simulated using the new binary collision cascade computer program OKSANA. The sputtering yield, the sputtering and reflection efficiencies, and the absolute and relative contributions to sputtering from various components have been calculated in a broad range of incidence angles. The obtained angular dependences of the sputtering yield have proved to agree with experimental data. Some features of sputtering due to semichannel focusing of incident particles have been found. The contributions to sputtering from several types of linear collision chains and from the primary knock-on atoms are considered in most detail. It has been shown, in particular, that the pure focused, pure defocused, and mixed focused-defocused collision chains contribute noticeably to sputtering. The contribution from the primary knock-on atoms is angle-dependent and reaches its maximum in the range of glancing angles for both single-crystal an...
TL;DR: In this paper, it was shown that the distribution of the maximal deviation tends to double exponent with logarithmic rate and this rate cannot be improved, and it is shown that there is no improvement in this rate.
TL;DR: In this article, the ambiguity of spectroscopic parameters in the case of accidental vibration is discussed, and the rotation resonances in tetrahedral molecules are discussed in the presence of an accidental vibration.
TL;DR: Evidence has been obtained that only nascent precursor polypeptides can be processed efficiently into structural proteins in the membrane-dependent reaction.
TL;DR: The reaction of hydrogen electrooxidation on carbon-black electrodes with hydrogenase has been studied in this paper, where it is shown that in the presence of hydrogenase a hydrogen equilibrium potential equal to 0.0 V is established on a carbon-Black electrode in phosphate buffer, pH 7.5, saturated with hydrogen.