A method of measuring the dielectric constant of solid slightly absorbing materials using an open resonator
A method of measuring the dielectric constant of solid slightly absorbing materials using an open resonator
Yu.K. Alekseev and A.I. Kostienko
A simple method of measuring the dielectric constant of slightly absorbing sheet dielectrics using an open resonator in the millimeter wave band is proposed. Measurements of the dielectric constant of a number of specimens were carried out both using the proposed method and a wellknown waveguide method. The results are in good agreement within the limits of experimental error.
Show AbstractThe mechanism of the storage effect when measuring the surface conductivity of germanium in transverse electric fields
The mechanism of the storage effect when measuring the surface conductivity of germanium in transverse electric fields
R.V. Prudnikov and V.A. Matveev
The mechanism of the storage effect in an atmosphere of Н$_2$О and NH$_3$ vapor in specimens of n - type germanium is investigated. It is shown that the storage effect arises in Н$_2$О vapor and is not present in NH$_3$ vapor and depends to a large extent on what sort of carriers are concentrated in the germanium surface. A new "proton" mechanism of the storage effect is proposed.
Show AbstractEffect of amorphization on the elastic properties of crystalline quartz irradiated with fast neutrons
Effect of amorphization on the elastic properties of crystalline quartz irradiated with fast neutrons
L.P. Osipova and Yu. A. Ivashkin
It is shown that the change in the elastic moduli S$_{11}$, S$_{13}$, S$_{14}$, S$_{33}$ and S$_{44}$ of crystalline quartz irradiated with fast neutrons can be satisfactorily explained using a model which takes into account the reduct ion in the crystal phase due to an increase in the fraction of the amorphous phase, effective heating of the crystal matrix, and the action of negative stresses proportional to the content of the amorphous phase.
Show AbstractAn experimental study of the interface dynamics in a two-layer liquid
An experimental study of the interface dynamics in a two-layer liquid
N.K. Shelкоvnikov, G.I. Alyavdin and S.I. Zaitsev
Дано описание методики и аппаратуры для физического моделирования процессов энергообмена в двухслойной жидкости.Исследования проводились в прямоугольном аэрогидроканале, заполненном пресной и соленой водой с резкой границей раздела между ними. Под действием воздушного потока возникала сложная структура течений и происходила турбулизация верхнего слоя воды. Экспериментально определены скорости вовлечения нетурбулизированной жидкости в перемешанный слой в зависимости от внешних параметров. Рассчитана доля,энергии ветра, расходуемая на процесс вовлечения (0,2%). Выделены характерные частоты, соответствующие выбросам соленой воды в перемешанный слой. Для объяснения существования на границе раздела периодических выбросов была привлечена гипотеза вязкого колеблющегося подслоя Эйнштейна и Ли, получено удовлетворительное согласование экспериментальных результатов с расчетами.
Show AbstractCalculation of the conductivity of a disordered semiconductor in a strong field mixed with a random field
Calculation of the conductivity of a disordered semiconductor in a strong field mixed with a random field
V.L. Bonch-Bruevich
A study is made of the importance of the random field when the conductivity of a disordered semiconductor is determined by the derealization of some of the bound carriers. The random field weakens the voltage dependence of the current.
Show AbstractTheory of the temperature superlattice in a semiconductor with hot electrons
Theory of the temperature superlattice in a semiconductor with hot electrons
A.A. Luk'yanov
The production of an electron - temperature superlattice in a hot-electron semiconductor is considered in the linear approximation for the case where the absorption coefficient for the heating light is dependent on the electron temperature. The distribution of the electron temperature under static conditions has been derived, and also for free convection in the electron gas. The electromagnetic-field distribution has also been derived for the latter case. The critical light intensity at which the superlattice arises has been calculated.
Show AbstractElectrodynamics of a coaxial open cavity with a reflective diffraction grating
Electrodynamics of a coaxial open cavity with a reflective diffraction grating
Yu.A. Pirogov and N.F. Ryapolov
Theoretical and experimental studies are presented on a coaxial cavity with an external focusing mirror and an internal grating of cylindrical or conical shape. Expressions are derived for the amplitudes of the incident wave and of the spatial harmonics. Patterns have been derived for the distributions of radially propagating modes with various numbers of half-waves along the zaxis. Measurements have been made on the slow-wave properties of a cylindrical diffraction grating in the cavity.
Show AbstractOptimal mode of operation of a capacitive transducer in gravitational radiation detectors
Optimal mode of operation of a capacitive transducer in gravitational radiation detectors
Yu.I. Vorontsov and F.Ya. Khalili
The capacitive and other linear transducers that are known provide us with information on the instantaneous coordinate of the mechanical oscillator. The quantum theory of measurements predicts a precision limit of continuous measurement of the coordinate. When the transducer is working in the pulse mode, the instantaneous coordinate of the oscillator can be measured for the time t$_m$ ≪ 1/ ω$_M$ with an error √(ω $_M$t$_m$)times better than for the continuous mode. Consequently, the gravitational detector sensitivity increases. The outer effect on the antenna in this case can be found by measuring the instantaneous coordinate after a time multiple to the period of the antenna oscillations(2π/ ω$_M$).
Show AbstractInduced anisotropy in a cylindrical neodymium-doped garnet component
Induced anisotropy in a cylindrical neodymium-doped garnet component
Yu.A. Golyaev, K.N. Evtyukhov, and L.N. Kaptsov
A calculation is performed on the induced birefringence in a cylindrical garnet rod having a parabolic temperature distribution. An estimate is made of the effects of the induced anisotropy on the lasing performance and on the gain for linearly polarized radiation in a cavity containing a component in which the birefringence varies over the cross - section. The theoretical results are compared with experiment. The effects of residual stresses have been determined.
Show AbstractParametric spin-wave excitation in a ferrite single crystal with high anisotropy
Parametric spin-wave excitation in a ferrite single crystal with high anisotropy
A.I. Pil'shchikov and G.F. Zakharov
A theoretical discussion is presented of the parametric excitation of spin waves in ferrite single crystals with high crystallographic anisotropy; it is shown that there are regions of sharp change in the spectrum and in the threshold fields that are related to the effects of the ellipticity and the overlap between the characteristic regions in the anisotropic spectrum for the thermal spin waves; the phenomena are analyzed for Ni -ferrite.
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