The dispersion curves and distribution coefficient of elastic waves propagating in an infinite cylindrical shell are investigated.
Show AbstractThe strength of induced electromagnetic radiation of an anharmonic oscillator is calculated. It is shown that the induced radiation exceeds the absorption provided that the stimulating radiation has a frequency exceeding the resonance frequency of quantum transition.
Show AbstractExpressions for Green's function and amplitude of scattering of a scalar particle in an external gravitational field g_{μν}(х) in closed form in the form of functional integrals are found. It is shown that the tensor nature of the gravitational field results in a more rapid growth of a cross section with energy, as compared with the scattering on a vector potential. Discrete energy levels of a particle in a Newtonian potential are obtained.
Show AbstractA technique for calibrating a pressure-gradient transducer in a water-filled volume by finding analytic relationships between the acoustic pressure and components of oscillatory velocity and averaging the field over one, two and three coordinates is examined. Computer calculations carried out on the assumption that the walls containing the water volume are acoustically soft, as well as experimental results, are presented.
Show AbstractThe damping properties of a strip with periodic ribs, the spaces between which are filled by various vibration-damping materials and coatings are investigated experimentally. Absorption filters employing the oscillations of a fin have a resonance dependence of the damping coefficient on the frequency. When butyl rubber strips are cemented on the ribs the attenuation coefficient is as high as 4-5 dB per rib. A numerical investigation is carried out for a filter of a single rib with viscous friction at [one] end.
Show AbstractThe results of computer solution of truncated equations describing oscillatory processes in a single-circuit self-biased parametric subharmonic oscillator [par ametron] are presented. Amplitude, phase and bias building up modes in this de vice are analyzed with allowance for simultaneous operation of the dissipative, detuning and biasing frequency limiting mechanisms. Features of building up pro cesses in the parametron under study in the absence of self modulation, as well as with sinusoidal and intermittent self-modulation are examined.
Show AbstractThe induced Raman scattering (IRS) spectra of pyridine in solutions with methyl, ethyl, and n-propyl alcohols are investigated. It is established that complex ing in the solutions due to intermolecular hydrogen bonding has a strong influence on the spectral composition of the IRS.
Show AbstractThe temperature-frequency dependence of ε and tgδ for quartz subjected to reactor irradiation (2*10^18 н/см^2) are investigated.
Show AbstractThe soft-photon approximation is employed for obtaining an expression for the bremsstrahlung radiation cross section for relativistic electrons on a nucleus in a magnetic field. Particular cases of many-photon synchrotron radiation are also examined within the framework of this approximation.
Show AbstractThe evolution of the orbital elements of asteroids of the Hecuba type is discus sed. Theoretical calculations are presented.
Show AbstractThe results of theoretical calculation of spatial correlation functions of bottom clutter on a pair of horizontally arrayed hydrophones are described. Space-cor relation functions are presented for horizontally spread astatic hydrophones and for various spatial arrangements of dipoles relative to one another and relative to the emitted radiation pattern. It is shown that the interference produced by bottom clutter having properties assumed in theoretical limitations can be atten uated by proper selection of the emitted and received radiation pattern.
Show AbstractAn elementary mechanical method for generating vortex disturbances, which can be used in model studies of atmospheric processes, is described.
Show AbstractFormulas are derived for the energy-averaged cross section of resonant elastic scattering in the following model: there exists an input state that is bound to the continuous spectrum and a "background" of equidistant compound-nucleus levels; the matrix elements of the interaction of the input state with the compound levels are assumed constant, and the fluctuati ons of the compound-level widths are assumed small.
Show AbstractA series of solutions of Einstein-Maxwell equa-tions with an A-term describing the gravity field of quasisteady lumped systems containing an electric and a mag netic charge is obtained. The metrics thus found belong to the Petrov-Pirani D class and have zero rotation and shear. A physical interpretation of the obtained solutions is presented. The present, first part of the study contains the statement of the problem in terms of t9e method f spin coefficients.
Show AbstractThis paper validates the "q method" for solving equations of the electromagnetic cascade theory and explores the development of this method for making allowance for processes with inhomogeneous cross sections.
Show AbstractFeatures of the propagation of nonlinear waves in stratified media are examined within the framework of the method of Hamiltonian formalism.
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