On the damping of vibrations by absorption materials placed between elastic stiffening ribs of a strip
On the damping of vibrations by absorption materials placed between elastic stiffening ribs of a strip
V.V. Gruzin, V.P. Kandidov, A.N. Pankratova, and B.I. Shmal'gauzen
The 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 AbstractSome numerical results on transients in a self-biased parametric subharmonic oscillator
Some numerical results on transients in a self-biased parametric subharmonic oscillator
Vu An Fi and V.I. Medvedev
The 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 AbstractA study of the spectral composition of the induced raman scattering of pyridine in solutions with aliphatic alcohols
A study of the spectral composition of the induced raman scattering of pyridine in solutions with aliphatic alcohols
N.I. Rezaevand, M.В. Таbibi
The 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 AbstractEffect of reactor irradiation on the electrical characteristics of crystalline quartz
Effect of reactor irradiation on the electrical characteristics of crystalline quartz
A.P. Shtyrkova and Т.M. Glushkova
The temperature-frequency dependence of ε and tgδ for quartz subjected to reactor irradiation (2*10^18 н/см^2) are investigated.
Show AbstractBremsstrahlung radiation of relativistic electrons on a nucleus in a magnetic field in the soft-photon approximation
Bremsstrahlung radiation of relativistic electrons on a nucleus in a magnetic field in the soft-photon approximation
A.M. Voloshchenko, V.Ch. Zhukovskii, and Yu.G. Pavlenko
The 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 motion of asteroids of the Hecuba type
The motion of asteroids of the Hecuba type
I.A. Gerasimov
The evolution of the orbital elements of asteroids of the Hecuba type is discus sed. Theoretical calculations are presented.
Show AbstractSpatial correlation of a model of bottom reverberation for a narrow-band signal and horizontal orientation of the receiver array
Spatial correlation of a model of bottom reverberation for a narrow-band signal and horizontal orientation of the receiver array
N.S. Vinogradov, F.V. Rozhin, and O.S. Tonakanov
The 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 AbstractGeneration of vortex disturbances in elliptically rotating fluid
Generation of vortex disturbances in elliptically rotating fluid
N.F. Gorshkov and A.M. Obukhov
An elementary mechanical method for generating vortex disturbances, which can be used in model studies of atmospheric processes, is described.
Show AbstractThe formation of giant resonances in atomic nuclei
The formation of giant resonances in atomic nuclei
V.S. Rostovskii and N.P. Yudin
Formulas 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 AbstractThe gravity field of quasi-steady lumped systems without rotation (1)
The gravity field of quasi-steady lumped systems without rotation (1)
V.I. Khlebnikov
A 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.
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