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Mass spectrum of mesons in the five-dimensional theory of gravitation, electromagnetism, and scalar field

Mass spectrum of mesons in the five-dimensional theory of gravitation, electromagnetism, and scalar field

A.D. Popov

Moscow University Physics Bulletin 1983. 38. N 6. P. 67

Within the framework of the five-dimensional theory of gravitation, electromagnetism, and scalar field, by means of additional space-time measurements, mass formulas describing the mass spectrum of all presently known mesons with high accuracy are obtained.

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Existence and uniqueness of solution of the Vlasov system of equations in a bounded region

Existence and uniqueness of solution of the Vlasov system of equations in a bounded region

P.B. Dmitriev

Moscow University Physics Bulletin 1983. 38. N 6. P. 74

Theorems of existence in the small and uniqueness of the generalized solution are proven for a one-dimensional system of Vlasov equations, with the condition of absorption for the distribution function at the ends of the interval.

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Phase relations in Bragg diffraction

Phase relations in Bragg diffraction

V.I. Balakshii, E.A. Nikanorova, V.N. Parygin

Moscow University Physics Bulletin 1983. 38. N 6. P. 79

The dependence of the amplitude and phase of light in the zero order of diffraction on the amplitude of the acoustic wave and the angle of incidence of the light on the interaction region is investigated. The features of the passage of a spatially modulated light wave through an acoustic field are considered. The nonreciporcal effect is investigated.

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Transformations of a Laplacian series in rotations of the coordinate system

Transformations of a Laplacian series in rotations of the coordinate system

N.A. Chuikova

Moscow University Physics Bulletin 1983. 38. N 6. P. 85

On the basis of the addition theorem for generalized spherical functions, the transition matrix for Laplace-series coefficients in rotations of a spherical coordinate system is determined, and the invariance of the normalized exponential dispersion in such a rotation is proven.

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Generational properties of multicomponent dye solutions with lamp excitation

Generational properties of multicomponent dye solutions with lamp excitation

A.M. Saletskii, V.I. Yuzhakov, V.I. Primak

Moscow University Physics Bulletin 1983. 38. N 6. P. 89

The generational and spectral characteristics of mixed solutions of Rhodamine dyes and oxazine 17 are given, as a function of the concentration of donor and acceptor components and the solvent composition with lamp pumping. Change in these characteristics is associated with the influence of inhomogeneous broadening of the energy states of dye molecules and intercombinational transitions to triplet levels.

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Specific heat of compounds Fe$_x$Co$_{1-x}$Cl$_2$ at low temperatures

Specific heat of compounds Fe$_x$Co$_{1-x}$Cl$_2$ at low temperatures

M.O. Kostryukova

Moscow University Physics Bulletin 1983. 38. N 6. P. 93

The specific heat of four compounds Fe$_x$Co$_{1-x}$Cl$_2$ is measured in the concentration range x = 0-0.6 and the temperature range 2-27. In these compounds, in which the initial components are laminar antiferromagnets with strong competing anisotropy, the phase diagram and the features of the laws of spin-wave dispersion are investigated.

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Orientational phase transition of the first kind in a thin ferromagnetic film

Orientational phase transition of the first kind in a thin ferromagnetic film

A.S. Zhukarev, A.N. Matveev

Moscow University Physics Bulletin 1983. 38. N 6. P. 97

The distribution of the magnetization in a plane-parallel layer of a uniaxial ferromagnetic after an orientational phase transition from a state with homogeneous magnetization to a state with a band domain structure accompanying a change in an inclined external field is calculated.

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Influence of natural parameter fluctuatiuns on the spectral characteristics of nonlinear oscillators

Influence of natural parameter fluctuatiuns on the spectral characteristics of nonlinear oscillators

P.R. Stankov

Moscow University Physics Bulletin 1983. 38. N 6. P. 100

The spectral parameters of a self-oscillatory system with a resonant circuit of finite mechanical rigidity under the action of natural fluctuations are investigated. It is shown that, in such autogenerators, depending on the self-oscillation power, the spectral characteristics may differ significantly from the traditional form; the generation lines are considerably broadened here, and regions of considerable intensity appear in the spectra of amplitude and frequency fluctuations; in real conditions, this leads to significant reduction in stability of the self-oscillation frequency.

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Temperature dependence of the conductivity of two-dimensional systems in conditions of weak localization

Temperature dependence of the conductivity of two-dimensional systems in conditions of weak localization

P.A. Vorob'ev, I.P. Zvyagin

Moscow University Physics Bulletin 1983. 38. N 6. P. 104

It is shown that, in conditions of weak localization, the correlational contribution to the conductivity of two-dimensional disordered systems may be proportional to ln$T$ or $p\text{ln}T$, depending on which predominates: the temperature broadening or the inelastic damping.

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Shock-ionization rate in the alloy Hg$_{0.80}$Cd$_{0.20}$Te

Shock-ionization rate in the alloy Hg$_{0.80}$Cd$_{0.20}$Te

E.V. Bogdanov, N.B. Brandt, L.S. Fleishman

Moscow University Physics Bulletin 1983. 38. N 6. P. 107

The dependence of the shock-ionization rate g on the electric field strength is obtained for the $n$-type alloy Hg$_{0.80}$Cd$_{0.20}$Te at temperatures T = 4.2 and 77 K. It is established that $g$ decreases with increase in temperature. At T = 4.2 K, nonmonotonic variation in $g$ is observed in a longitudinal magnetic field: the initial increase is replaced by a drop.

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