The temperature dependence of a modified diode is calculated approximately for conditions corresponding to the existence of a virtual cathode. The results of an experimental study of the reaction of such a diode to a temperature change of the electron beam are found to agree with the calculated results.
Show AbstractA new method is described for constructing the solution for flow around an arbi trary profile. The effects of profile features at the lower boundary on the solu tion of the two-dimensional steady-state problem of lee waves are studied. An actual mountain profile is obtained, and the field of stream functions is plotted in dimensionless form. This particular solution is analyzed.
Show AbstractThe angular distribution and longitudinal polarization of electron-positron pairs formed by circularly polarized photons in the field of a nucleus having a magnetic dipole moment are found in the Born approximation with an account of the mean square radius and force moment of the nuclear charge and magnetic-moment distribu tions. The effects of <r^2> and <r^4> on the spectra of charge and magnetic pair photocreation are steady.
Show AbstractLinear and nonlinear filtration methods are prepared. The method of conditional Markovian processes is used to find a procedure for nonlinear interpolation and extrapolation of a double Markovian signal. The results are compared with the analogous results for linear filters.
Show AbstractAn analog of the Bogolyubov inequality is proved for two-time temperature Green's functions in the statistical mechanics of classical systems. The use of the results is illustrated with an example.
Show AbstractA three-dimensional chronometrically invariant vector potential for inertial forces is constructed within the framework of the three-dimensional, chonometrically invariant, two-metric formalism from the components of the metric tensor gαβ. The concept of an inertial reference system is formulated for undeformed reference systems in which time can be synchronized at all spatial points, and an expression is found for the inertial force in terms of its potential.
Show AbstractThe model of a cyclotron-resonance maser with a TEM-field of a cavity near an elec tron beam is discussed. It is shown that generation is possible when nonrelativis tic electrons interact with both the forward and backward waves; an expression is given for the trigger current. A comparison is made of the effects on negative absorption of various bunching mechanisms in a TEM-wave in cavities, in which the interaction time is finite, and in waveguides.
Show AbstractElectron reflection from a magnetic field filling a half-space is analyzed, and a differential cross section is found for bremsstrahlung and the total energy loss for a single reflection. It is shown that photon emission upon reflection leads to a predominant polarization of electrons opposite the field. For nonrelativistic electrons, this polarization is nearly total.
Show AbstractThe equatorial curve effect was measured in the visible and IR regions(0.15-3 eV) for Ni-Co alloys covering the entire composition range from pure Ni to pure Co. There is a discussion of the effect of the crystal structure of a ferromagnet on the position of the natural frequencies and the shape of the dispersion curve for the magnetooptical effect.
Show AbstractA second-approximation solution is found for the excitation of standing waves of finite amplitude in a loss-free solid layer. A solution is also found for the problem of detecting amplitude-modulated longitudinal and transverse waves, by exploiting the nonlinear properties of the medium. The effect of high-frequency damping is analyzed.
Show AbstractThe existence of a wave function for one of a set of N subsystems is analyzed. It is shown that, even in the case of noninteracting subsystems, none can have a wave function in the ordinary sense. A generalized wave function is introduced which can be used to describe any subsystem of any system, and the relation between this function and the genealogical coefficients and the density matrix is determined.
Show AbstractThe general properties of trajectories of the roots of characteristic equations of the Фn(p)+ρψm(p)+ ρ^2Θl(p)=0 type are discussed. The general properties of these trajectories yield the qualitative behavior of the root hodographs. A method is also described for plotting the root trajectories based on methods developed for the root trajectories of equations having a linear free parameter. Examples are given.
Show AbstractAn experimental study was made of the transverse structure, time dependence, and spatial coherence of the radiation from a pulsed ultraviolet laser having an active medium of N2 and operating at a wavelength of λ=3371 А. The transverse structure of the structure of the laser beam is found to depend on the mirror adjustment, and the radiation is found to be coherent over the entire aperture. The use of an amplifier is suggested for increasing the efficiency of such lasers.
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