Calculation of losses in the rectifying diode of rectenna
Calculation of losses in the rectifying diode of rectenna
G.P. Boyakhchyan, S.K. Lesota, F.N. Maslovskii, A.V. Rachnikov, I.G. Sambur
We present a system of equations which relate the characteristics of an element of the rectenna, in particular, the efficiency, with the parameters of the Schottky diode. These equations are intended for the determination of the proper ohmic losses in the element of the rectenna. We develop a method for the minimization of proper losses for various levels of the input microwave power. We calculate the losses in Au-GaAs diode. The calculations show that this type of diode can ensure higher than 90% conversion efficiency in a wide range of the input power (from 0.1 to 5W).
Show AbstractImpulsive reverse-magnetization mechanism of weak-field switching in polycrystalline ferrites
Impulsive reverse-magnetization mechanism of weak-field switching in polycrystalline ferrites
O.S. Kolotov, V.A. Pogozhev, H.V. Telesnin
We study the internal effect field $H_e$ to gain a better understanding of the applicability of the model of growth of the reverse-magnetization nuclei to the case of pulse magnetization reversal of polycrystalline ferrites in weak fields. It is shown that the dependence of the field $H_e$ on the induction of the magnetized sample, calculated using this model, is in good agreement with experiment.
Show AbstractObservation of the blocking effect of surface gravity-capillary waves by inhomogeneous flow
Observation of the blocking effect of surface gravity-capillary waves by inhomogeneous flow
K.V. Pokazeev, A.D. Rozenberg
We consider the blocking effect of regular surface waves by inhomogeneous flow. In a laboratory channel, we observe the stopping and reflection of waves with frequencies 1.5, 1.7 and 2 Hz on a parallel flow or counterflow, which changes slowly along the direction of propagation of the waves. The results agree with the ideas of the linear wave theory.
Show AbstractThe effect of water adsorption on the kinetics of charge exchange of the slow states in silicon
The effect of water adsorption on the kinetics of charge exchange of the slow states in silicon
S.N. Kozlov, N.L. Levshin
We study the kinetics of slow relaxation of the charge on silicon surface in water-vapor atmosphere in a wide time range ($10^{- 2}\le t \le 10^5$ sec). It is shown that the experimental data agree fully with the ideas of the electronic-vibrational model for the charge exchange of the slow states. The form of kinetic curves corresponds to the Gaussian distribution over the energies of the O-H vibrational modes of the adsorbed complexes, which include rigidly adsorbed water molecules.
Show AbstractAn investigation of the parameters of high-frequency discharge plasma at intermediate pressures by spectroscopic methods
An investigation of the parameters of high-frequency discharge plasma at intermediate pressures by spectroscopic methods
A.A. Kuzovnikov, A.V. Malyarov, V.P. Savinov, V.G. Yakushin
The measured absolute and relative intensities of spectral lines are used to study the characteristics of a strongly nonequilibrium high-frequency discharge plasma at intermediate pressure in helium, in which the electron distribution function over energies contains groups of "slow" and "fast" electrons. It is established that the effective temperature of "slow" electrons $T_e{}^M$ is 0.15-0.25 eV, and the contribution by their ionization to the total electron concentration is of the order of $10^{12}-10^{13} cm^{-3}$. We determine the population of the highly-excited energy levels of He atoms for the principal quantum number $n=4-14$. The obtained low values of $T_e{}^M$ are explained by the presence of electron beams in the discharge.
Show AbstractSpatial asymmetry of transition radiation of polarized electrons
Spatial asymmetry of transition radiation of polarized electrons
V.M. Zakhartsov, Yu.M. Loskutov, V.A. Lysov
We consider the transition radiation of transversely polarized electrons which intersect the boundary of a perfectly conducting medium. We obtain the spectral-angular distribution of the radiation. It is shown that the polarization matrix of the transition radiation has spatial asymmetry due to the correlation between the pseudovector of transverse polarization of the electron, and the pseudovector of electron spin.
Show AbstractCalculation of the characteristics of the lowest "TWC particles-two holes" resonance in the neon atom in the diagonalization approximation
Calculation of the characteristics of the lowest "TWC particles-two holes" resonance in the neon atom in the diagonalization approximation
V.G. Lyubartsev, S.I. Strakhova, V.A. Shakirov
We calculate the characteristics of the state $2p^{-2}(^3P)3s3p^1P$ in the resonant photoionization cross section of the neon atom, using the diagonalization approximation on the basis of Hartree-Fock functions. The direct coupling of the "particle-hole" state and "two particles - two holes" states is taken into account by introducing an empirical parameter. The results are compared with experiment and with the results of calculations by the method of strong coupling between channels.
Show AbstractGeneral theory of multiple scattering in randomly inhomogeneous media
General theory of multiple scattering in randomly inhomogeneous media
A.N. Starodumov
The solutions of the stochastic Helmholtz equation are expressed in the form of "integral over trajectories", with a subsequent averaging and evaluation by the method of stationary phase. By way of example, we consider a point source in a spherically-layered medium with small-scale inhomogeneities.
Show AbstractNonlinear resonance in a circuit with metal-dielectric-semiconductor structure illuminated by light
Nonlinear resonance in a circuit with metal-dielectric-semiconductor structure illuminated by light
S.E. Kokarev, V.F. Marchenko
We calculate theoretically the resonance curves of a circuit with metal-dielectric-semiconductor structure illuminated from the dielectric side by continuous gas laser. The change of average capacitance of the structure in the region of inversion is due to the difference between the equilibrium and pulsed voltage-capacitance characteristics. We present experimental results in the region 1-2 MHz.
Show AbstractReception of radiosignals by the phase-quantization method with fpequency preconversion
Reception of radiosignals by the phase-quantization method with fpequency preconversion
V.P. Komolov, V.A. Polezhaev, I.T. Trofimenko, P.N. Shashkov
We discuss the possibility of applying the phase-quantization method for the reception of low-frequency and very-low-frequency radiosignals. A weak signal of frequency 1 kHz is detected experimentally using parametric quantization of phase with frequency preconversion of the frequency of the signal by 1 MHZ in a ring modulator.
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