Gravitational field of plane electromagnetic wave in Visser's gravitation theory
Gravitational field of plane electromagnetic wave in Visser's gravitation theory
M.M. Karetskii
A new exact solution of gravitation theory equations with a massive graviton has been obtained for the case when the source of a gravitational field is a plane electromagnetic wave.
Show AbstractQuasielastic knocking-out of neutral pions from a nucleon by high-energy electrons and the structure of an $\omega$-meson cloud of a nucleon
Quasielastic knocking-out of neutral pions from a nucleon by high-energy electrons and the structure of an $\omega$-meson cloud of a nucleon
N.P. Yudin, L.L. Sviridova, V.G. Neudachin
It is shown that in the kinematic range $Q^2\ge3$ GeV$^2/c^2$, $Q^2\gg k^2$, the main contribution into the cross section $d\sigma_T/d(k^2)$ of neutral pions electroproduction is made by the process of qnasielastic knocking-out of $\rho^0$- and $\omega$-mesons followed by their restructuring into a $\pi^0$-meson. It is proposed to use this property of electroproduction for directly probing the structure of the nucleon $\omega$-meson cloud, which will allow one to determine not only the momentum distribution of the $\omega$-meson in the nucleon, the spectroscopic factor of its separation, and the constant of $\omega NN$ interaction, but also the relative sign of the $G_{\rho NN}$ and $G_{\omega NN}$ constants.
Show AbstractStudy of self-oscillations in distributed-parameter Van der Pol oscillator
Study of self-oscillations in distributed-parameter Van der Pol oscillator
V.F. Kambulov, A.Yu. Kolesov, N.Kh. Rozov
The authors study a mathematical model of a distributed-parameter analog of a Van der Pol oscillator, which is a linear system of telegraph equations with nonlinearity in one of the boundary conditions. The theol-etical study reveals a buffer phenomenon, i.e., simultaneous existence of several stable periodic regimes in the boundary-value problem under investigation. The results of the experiment confirming the feasibility of this phenomenon are described.
Show AbstractEffect of edge fields on velocity spread of a helical electron beam in magnetic undulators with guiding magnetic field
Effect of edge fields on velocity spread of a helical electron beam in magnetic undulators with guiding magnetic field
A.F. Aleksandrov, V.A. Kubarev, A.V. Mikhailov
The formation of relativistic helical electron beams in flat and coaxial magnetic undulators with guiding magnetic field has been considered with due account for the undulator's edge fields. The feasibility of producing beams with low velocity spread has been demonstrated.
Show AbstractDamping in electromechanical oscillatory system caused by processes in the electric subsystem
Damping in electromechanical oscillatory system caused by processes in the electric subsystem
I.A. Elkin, V.P. Mitrofanov
Theoretical calculations and results of experimental determination of the damping factor of a mechanical oscillator introduced by the coupled system of electric force action on the oscillator test mass have been presented. A possibility of regenerating the oscillations in such systems has been shown. The application of the results obtained to devices correcting the position of test masses in interferometric gravitational antennas has been discussed.
Show AbstractApproximate method for evaluating spectral coefficients of multilayer coatings with weakly nonhomogeneous layers
Approximate method for evaluating spectral coefficients of multilayer coatings with weakly nonhomogeneous layers
A.V. Voronov, A.V. Tikhonravov, M.K. Trubetskov
A new approximate method has been developed for calculating spectral coefficients of multilayer coatings with weakly nonhomogeneous layers. The method was demonstrated to be highly accurate. The most important feature of the method is the simplicity of parametric description of multilayer coatings with non.homogeneous layers, which is a decisive factor for further development of methods for synthesizing such coatings.
Show AbstractEffect of ultrasound and light illumination on dissipative properties of CdS. 2. Highresistance crystals
Effect of ultrasound and light illumination on dissipative properties of CdS. 2. Highresistance crystals
G.V. Bushueva, G.M. Zinenkova, V.I. Kozlovskii, I.G. Polyakova, N.A. Tyapunina
Changes in dissipative properties of high-resistance CdS samples under the action of light and ultrasound are studied. Passage from darkness to light causes a jump change in the strain amplitude $\varepsilon^0$ in a standing ultrasonic wave and in the internal friction $Q^{-1}$ of the samples. Depending on the initial state, the response to illumination can be both positive (an increase in $\varepsilon^0$ and a decrease in $Q^{-1}$) and negative (a decrease in $\varepsilon^0$ and an increase in $Q^{-1}$). The action of ultrasound causes changes in $\varepsilon^0$ and $Q^{-1}$ jump values. The dissipative properties of CdS are discussed in relation to CdS cathodoluminescence spectra.
Show AbstractM$\stackrel{..}{o}$ssbauer studies of $^{57}$Fe nuclei hyperfine interactions in spin reorientation in the (Tb$_{0,45}$Dy$_{0,55}$)$_{1-x}$Ho$_x$Fe$_2$ system
M$\stackrel{..}{o}$ssbauer studies of $^{57}$Fe nuclei hyperfine interactions in spin reorientation in the (Tb$_{0,45}$Dy$_{0,55}$)$_{1-x}$Ho$_x$Fe$_2$ system
V.S. Rusakov, A.S. Ilyushin, A.B. Baranov
M$\stackrel{..}{o}$ssbauer studies of the (Tb$_{0,45}$Dy$_{0,55}$)$_{1-x}$Ho$_x$Fe$_2$ system have shown that spin reorientation occurred in the $(1\bar{1}0)$ plane in a narrow concentration range; the isotropic magnetic field on $^{57}$Fe nuclei depends linearly on the effective spin of the sublattice of rare-earth metal cations; and the anisotropic magnetic field included two contributions of the same sign and of the si;tme order of magnitude, those from localized magnetic moments and conduction electrons polarized by these moments. No changes in the hyperfine interaction parameters caused by spin reorientation were detected. Mechanisms of formation of electric field gradients in the vicinity of $^{57}$Fe nuclei in Laves phases of the RFe$_2$ type have been suggested.
Show AbstractEnergy redistribution between waves and current at the initial stage of wind wave generation
Energy redistribution between waves and current at the initial stage of wind wave generation
E.P. Anisimova, K.V. Pokazeev, N.I. Soboleva, A.A. Speranskaya
Energy exchange is illustrated in the wind-wave interaction system with the focus at the initial stage of generation of drift current and waves. Laboratory experiments helped determine the relation between the dynamic (friction) velocities of the wind flow and the drift current. It is shown that under the conditions discussed in this paper only 33 % of the momentum flux coming to the water mass from the atmosphere is expended on wave growth, while the remainder goes to the generation and evolution of the drift current. Energy balance components on the water surface have been computed for the initial phase of wind-wave interaction.
Show AbstractDigital/analog conversion in gravitational wave experiment and reliability of correlation associated with astrophysical events
Digital/analog conversion in gravitational wave experiment and reliability of correlation associated with astrophysical events
A.V. Gusev
It is shown. that when interpreting the effect of correlation between "gravitational" pulses and cosmic events, it is necessary to take into account the error associated with restoration of the original continual output signals of gravitational antennas assigned in digital form from the experimental data.
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