К теории конденсированной фазы неравновесных носителей заряда в полупроводниках (II)
К теории конденсированной фазы неравновесных носителей заряда в полупроводниках (II)
Л.С. Стоянова.
Рассмотрены свойства электронно-дырочной плазмы в собственном полупроводнике при больших концентрациях неравновесных носителей в ней, когда предполагается, что система находится в конденсированном состоянии. Используются результаты [1]. для определения, равновесной концентрации и энергии связи на системе электрон — дырка в конденсате. На примере электронно-дырочной плазмы в Ge приводятся численные значения названных величин и сравниваются результаты, полученные при различных аппроксимациях реальной ситуации.
Show AbstractPlasticity surfaces and associated laws of crystal plastic flow compatible with the continuum theory of dislocations
Plasticity surfaces and associated laws of crystal plastic flow compatible with the continuum theory of dislocations
0.S. Rovenskaya and Yu.I. Sirotin
A crystal plasticity surface compatible with dislocation flow is examined. Ow ing to the presence of a finite number of dislocation types in the crystal, it is a polyhedron in stress-deviator space. The laws of plastic flow of the crys tal associated with piecewise-linear loading functions are written with consid eration of strain-hardening and viscosity. Features of strain-hardening and stress relaxation associated with the polyhedral nature of the plasticity sur face are investigated.
Show AbstractOne method of analyzing wing stability in flight
One method of analyzing wing stability in flight
S.P. Strelkov, N.D. Tarankova, and A.A. Kharlamov
The problem of determining the critical values ν_(cr) and ω_(cr) of torsional flutter is solved as a boundary-value problem for a distributed elastic system. The vibration modes of an inhomogeneous wing in flutter and a comparison of the values obtained with those given by the Bubnov-Galerkin method are presented.
Show AbstractEstimating the error of prediction of the motion of artificial earth satellites
Estimating the error of prediction of the motion of artificial earth satellites
Yu.Kh. Zhagar
В работе исследуется влияние случайных ошибок наблюдений ИСЗ (фотографических или лазерных) на точность вычисления элементов орбиты и влияние случайных ошибок элементов орбиты на точность прогнозирования движения ИСЗ. Приводится метод линейной параметризации элементов орбиты, позволяющий уточнять эфемериды ИСЗ в случае, когда элементы орбиты известны с большой погрешностью. Анализируются результаты расчетов на ЭВМ, полученные согласно изложенной методике.
Show AbstractToward a theory on the condensed phase of nonequilibrium carriers in semiconductors (I)
Toward a theory on the condensed phase of nonequilibrium carriers in semiconductors (I)
I.S. Stoyanova
The properties of an electron-hole plasma in an intrinsic semiconductor are considered at high nonequilibrium-carrier (electron and hole) concentrations. A variational method is used to determine the single-particle spectrum of the sys tem with allowance for the interaction. An expression is derived for the free energy of the system within the framework of the approach used, as well as expressions for the free energy per pair of condensate particles.
Show AbstractAcoustic field of a point source in a wedge bordering on a dissipative medium
Acoustic field of a point source in a wedge bordering on a dissipative medium
V.K. Kuznetsov
The hydroacoustic problem of the wave field of a point source In a coastal wedge is solved. The paper presents a number of concrete results that will be useful in practical hydroacoustics.
Show AbstractA perturbation-method solution of the ray-tracing equation for an inhomogeneous scattering spherically stratified medium
A perturbation-method solution of the ray-tracing equation for an inhomogeneous scattering spherically stratified medium
V.D. Gusev and A. Khuri
The ray-tracing equation is solved in the second approximation by the perturba tion method for a spherically layered linear model of the ionosphere. The angle-of-arrival fluctuations of the wave and the mean direction of its emer gence from the ionosphere are calculated for isometric Gaussian random inhomo geneities on the basis of this solution, and the results are analyzed with com parison to the results for a plane-stratified medium.
Show AbstractThe self-oscillatory system with triangular limit cycle as an element of an excitable medium
The self-oscillatory system with triangular limit cycle as an element of an excitable medium
A.V. Perepelitsyn, L.I. Pentegova, and Yu.M. Romanovskii
The kinetic equations of the biochemical glycolysis reaction are investigated in the relaxation regime. It is shown that an isolated volume in which this reac tion takes place is the sensitive element of the active medium, while the volumes connected by diffusion constitute the active medium as a whole.
Show AbstractGeneralization of the equivalent-linearization method to selfoscillatory systems with distributed parameters
Generalization of the equivalent-linearization method to selfoscillatory systems with distributed parameters
P.S. Landa
Equivalent linearization offers a method for approximate calculation of the amp litude of self-oscillations in a one-dimensional distributed system when genera tion is single-mode.
Show AbstractRole of the surface in the transformation of electromagnetic waves to acoustic waves
Role of the surface in the transformation of electromagnetic waves to acoustic waves
G.I. Ivanovski and M.I. Kaganov
The role of the surface in transformation of electromagnetic to acoustic energy is studied in normal metals in the absence of a constant magnetic field.
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