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M.V.Lomonosov Moscow State University
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Phenomenological structure of the weak lepton currents in the reactions of direct and inverse μ-decay

Phenomenological structure of the weak lepton currents in the reactions of direct and inverse μ-decay

В.K. Kerimov, V.A. Kazakov, M.Ya. Safin, V.V. Trefilov

Moscow University Physics Bulletin 1982. 37. N 5. P. 88

The muon decay μ→eνν ̅and the inverse process ν$_{μ}$e$^{-}$→ν$_{e}$ μ ν$^{-}$ is investigated in the case of the interaction of charged and nondiagonal neutral lepton currents of general form. It is shown how the structure of the interaction may be established using experimental data on these processes. On the basis of the known values of the μ-deсay parameters, bounds on the coupling constants of the currents are obtained.

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Investigation of a rectenna systems

Investigation of a rectenna systems

G.P. Boyakhchan, A.V. Erastov, S.K. Lesota, E.N. Shkol'nikov

Moscow University Physics Bulletin 1982. 37. N 5. P. 95

Certain characteristics of rectennas used as receivers and converters of VHP energy into DC energy in energy - transfer systems using VHF beams are theoretically and experimentally investigated.

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The study of distribution of constant magnetic field by means of NMR spectroscopy

The study of distribution of constant magnetic field by means of NMR spectroscopy

K.L. Zakharov, Yu.S. Коnstantinоv, A.M. Smirnоv

Moscow University Physics Bulletin 1982. 37. N 5. P. 98

The application of a variant of the sensitive - point method in studying the distribution of a constant magnetic field in the gap of a highresolution NMR spectrometer is considered. A method of producing two sensitive points is developed and theoretically verified: a motionless point which is used for internal proton stabilization and point scanning over the investigated volume. The following - receiver method is used to derive the NMR signal from the scanning sensitive point. The experimental apparatus is described.

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Radiation from the relativistic particles in a strong gravitational field

Radiation from the relativistic particles in a strong gravitational field

A.A. Sokolov, A.N. Aliev, D.V. Gal'tsov

Moscow University Physics Bulletin 1982. 37. N 5. P. 102

The local - coordinate method is used to investigate the synchrotron radiation of ultrarelativistic particles moving in a magnetic field in curved space-time. General covariant formulas are obtained for the radiation spectrum in the classical and quantum cases. It is shown that the radiation intensity and the relative values of the quantum corrections increase when the particle moves close to the event horizons in the Schwartzschild metric. The limiting transition to conditions of geodesic synchrotron radiation is considered.

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The influence of a nonsynchronized force to the mutial oscillators synchronizing

The influence of a nonsynchronized force to the mutial oscillators synchronizing

S.I. Veksin, I.I. Minаkоva

Moscow University Physics Bulletin 1982. 37. N 5. P. 106

The results of theoretical and experimental investigation of synchronous conditions of two generators connected by unidirectional couplings are presented. The possibility of controlling the frequency of the system by means of an asynchronous external force is shown.

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Diffusion coefficient of the binary liquid system along the coexistence curve

Diffusion coefficient of the binary liquid system along the coexistence curve

N.I. Chernova, S.V. Kazakov, Farouk El Mekawey

Moscow University Physics Bulletin 1982. 37. N 5. P. 110

The results of investigating the diffusion coefficient in the nitrobenzene - heptane system along the coexistence curve are presented. The parameters of the temperature and concentration dependences of diffusion are measured. It is shown that the character of the singularity in the diffusion coefficient as a function of the concenration is due to the properties of the coexistence curve.

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The jet structure of the bed flows investigated by means of velocity distribution in cross-section of beds

The jet structure of the bed flows investigated by means of velocity distribution in cross-section of beds

O.N. Mel'nikova, Yu.G. Pyrkin

Moscow University Physics Bulletin 1982. 37. N 5. P. 114

Riparian autonomous currents are investigated in channel flow, and the force field is determined from the isotach distribution in the flow cross section. The criteria determining the flow parameters at which riparian autonomous currents arise are discussed.

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Phase relations accompaining nonlinear acoustic interactions in the relaxation media

Phase relations accompaining nonlinear acoustic interactions in the relaxation media

A.D. Nosenko

Moscow University Physics Bulletin 1982. 37. N 5. P. 118

The phase relations In nonlinear acoustic interactions are experimentally investigated.

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About labile state at the spin-reorientation transition in magnetite

About labile state at the spin-reorientation transition in magnetite

K.P. Вelоv, A.N. Gоrуaga, L.A. Sкipetrоva, V.N. Pronin, R.V. Senina

Moscow University Physics Bulletin 1982. 37. N 5. P. 119

It is established that in magnetite, in the vicinity of the spln-reorientational transition, the spin system is unstable not only with respect to strong, but also to weak, external perturbations. Analysis of the results on magnetization, magnetocaloric effect, magnetic permittivity, and specific heat leads to the conclusion that the spin-reorientational transition Ф <111> ↔ Ф <100> in magnetite at low temperatures occurs without spinodal decay.

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Cyclotron radiation of neutrino pair in Weinberg-Salam model allowing for electrons polarization

Cyclotron radiation of neutrino pair in Weinberg-Salam model allowing for electrons polarization

I.M. Ternov, V.N. Rodionov, A.I. Studenikin

Moscow University Physics Bulletin 1982. 37. N 5. P. 122

The magnetic bremsstrahlung of a neutrino pair is considered, taking account of the initial or final electron polarization within the framework of the Weinberg-Salam weak-interaction model. In the case of ultrarelativistic particle energies, the transition to crossed fields is made, and expressions are obtained for the probability of the process in the two limiting cases: χ=Hеp$_{0}/m$^{3}$≪l and χ≫1.

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