Electron capture into excited states with collisions between nuclei and atoms
Electron capture into excited states with collisions between nuclei and atoms
Yu.A. Shurygina, V.S. Senashenko, Ya.A. Teplova
A method for calculating the cross sections of electron capture, developed with consideration of Coulomb asymptotic behavior of the wave functions of an electron, is used to analyze electron capture into excited states of a colliding particle in regions of intermediate and high energies.
Show AbstractMeasuring light radiation intensity using a parametron
Measuring light radiation intensity using a parametron
S.E. Zhmurov, V.F. Marchenko, I.T. Trofimenko
The experimental characteristics of a digital photocapacitance sensor of weak light radiation, in which planar $Аl—SiO_2\cdot Si_3N_4—Si$ structures are used, are cited. The radio frequency part of the sensor is a parametric oscillator built on the basis of a balance circuit with metal-dielectric-semiconductor structures, one of which is illuminated by light. A change in the intensity of the light changes the balance of the circuit; the intensity is proportional to the probability of fall out of one of the stable phases of the subharmonic with multiple triggering of a periodically excited parametric loop oscillator.
Show AbstractThe influence of anomalous dispersion on the characteristics of a ring laser
The influence of anomalous dispersion on the characteristics of a ring laser
N.V. Kravtsov, E.G. Lariontsev, A.N. Shelaev
The features of the frequency and amplitude characteristics of ring lasers, which contain a resonantly absorbing medium inside the resonator, are investigated. It is established that the presence of a medium with anomalous dispersion leads to a substantial increase in the dependence of the intrinsic generation frequencies and the difference in frequencies of opposed waves of the ring laser on the perimeter of the resonator and the magnitude of the optical nonmutuality. It is shown that stationary generation becomes unstable in a ring laser in the region of negative values of the group speed of light.
Show AbstractNonlinear orientation elasticity of a nematic liquid crystal
Nonlinear orientation elasticity of a nematic liquid crystal
Yu.V. Vasil'ev, E.F. Kuritsyna
The possibility of quantitative estimation of the first nonlinear correction to the law of elasticity of a nematic liquid crystal is shown.
Show AbstractA method for calibrating receiving antennas
A method for calibrating receiving antennas
V.V. Kravtsov, P.K. Senatorov
A method is proposed for determining the beam pattern of a receiving antenna based on data acquired with sequential irradiation of the antenna by a point source from different points in space. The method is based on mathematical modeling of the diffraction process.
Show AbstractTransition into a "dipole glass" state in the $(NH_4)_2(BeF_4)_{1-x}(SO_4)_x$ system
Transition into a "dipole glass" state in the $(NH_4)_2(BeF_4)_{1-x}(SO_4)_x$ system
B.A. Strukov, P.S. Smirnov, L.P. Reshetnikova
The temperature relation of heat capacity of a solid: solution of $(NH_4)_2(BeF_4)_{0,63}(SO_4)_{0,37}$ is investigated in a temperature range of 80-300 K. A proposal about the existence of a new mechanism of dipole glass formation in solid solutions of ferrielectrics, which is associated with the spatial deorientation of the polar directions in the initial components of the mixture, is advanced on the basis of an analysis of the nature of the temperature behavior of the heat capacity of the cited compound.
Show AbstractThe structure and magnetic properties of compounds of the $Dy_{1-x}Gd_xAl_2$ system
The structure and magnetic properties of compounds of the $Dy_{1-x}Gd_xAl_2$ system
M.M. Abd-el-Aal, A.S. Il'yushin, A.V. Pechennikov, Yu.R. Sharapov, V.I. Chechnerikov
The magnetic properties of compounds of a $Dy_{1-x}Gd_xAl_2$ system, where $x$ = O; 0.2; 0.4; 0.6; 0.8; and 1.0, are investigated in a temperature range of 4.2-1000 K. An X-ray phase analysis is performed. The magnetic moments of ferromagnetic and paramagnetic regions are identified. The dependence of the ferromagnetic and paramagnetic Curie point on concentration is shown. It follows from the acquired experimental results that ferromagnetic exchange interaction between atoms of the rare-earth metals, which is monotonically dependent on $x$, dominates in the $Dy_{1-x}Gd_xAl_2$ system.
Show AbstractInteraction between planar gravitational and electromagnetic waves in an external gravitational field
Interaction between planar gravitational and electromagnetic waves in an external gravitational field
V.I. Denisov, V.A. Eliseev
The process of interaction between a gravitational field and an electromagnetic field in the presence of an external gravitational field is examined for two classes of metric theories of gravitation. The results of this examination are used to find the conditions of resonance interaction and to show the possibility of continuous amplification of a planar electromagnetic wave by a planar gravitational wave. Numerical estimates of the possibility of formulating an experiment are given.
Show AbstractMultidimensional combination of a model of electromagnetic and weak Weinberg-Salam interactions with gravitation: a fermion sector
Multidimensional combination of a model of electromagnetic and weak Weinberg-Salam interactions with gravitation: a fermion sector
V.V. Kislov
Geometrical combination of gravitation with electromagnetic and weak interactions is examined with consideration of the fermion sector within the Kaluza-Klein theories. The SU(2) by U(1) calibrating group is formed in a seven-dimension model, while the SU(1,1) by U (1) group is formed in a six-dimensional model. The results of such combination are discussed.
Show AbstractA method for building calibrationally invariant Lagrangians for arbitrary Lie groups
A method for building calibrationally invariant Lagrangians for arbitrary Lie groups
A.P. Demichev, N.F. Nelipa
A general method is proposed for building calibrationally invariant Lagrangians which is based on the use of the theory of layered spaces and groups of transformations. The method makes it possible to acquire Lagrangians both with precise and with spontaneously disrupted symmetries. The Lagrangian for a nonuniform calibrating group of three-dimensional Euclidean movements is constructed as an example.
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