# Issue 6, 1988

## Oscillatory states of some nonlinear systems with distributed delay

## Oscillatory states of some nonlinear systems with distributed delay

### G.N. Medvedev and В.I. Morgunov

**1988**. N 6. P. 1

An analysis is given of the nonlinear oscillations of the components of manipulator devices, taking into account their viscoelastic prop erties. An averaging procedure is used to calculate the small oscillations of manipulator components that accompany the programmed motion of the mechanism.

Show Abstract## The effect of target density on the equilibrium charge composition of beams of fast helium ions

## The effect of target density on the equilibrium charge composition of beams of fast helium ions

### N.F. Vorob'ev, V.Р. Zaikov, and Е.А. Kral'kina

**1988**. N 6. P. 6

А calculation is reported of the mean charge $\bar{i}$ and the charge fractions $F_i$. of an equilibrium beam of helium ions in high and low density media as functions of the charge $Z_t$ of the target nuclei in the range $1\le Z_t \le 24$ and ion velocities in the range $V_0\le V\le 3V_0$. It is shown that the functions $\bar{i}(Z_t)$ and $F_i(Z_t)$ may bе very different in low and high density targets.

Show Abstract## Approximate analytic solution of the problem of the helium atom

## Approximate analytic solution of the problem of the helium atom

### V.I. Zharikov

**1988**. N 6. P. 10

The method of hyperspherical harmonic s is used to obtain an approximate analytic solution of the quantum- mechanical problem of the helium atom. The calculated ground- state energy differs from the exact value bу only 3,8%. The express ion for the wave function is reproduced.

Show Abstract## Generalized effect of dynamic damping of noise in resonant measuring circuits

## Generalized effect of dynamic damping of noise in resonant measuring circuits

### . А. V. Gusev and V. N. Rudenko

**1988**. N 6. P. 13

The minimum noise in measuring circuits consisting of а test oscillator and а resonance electromechanical transducer is discussed. А formula is given for the amplitude of the threhold signal for large values of the electromechanical coupling coefficient.

Show Abstract## An analysis of processes occurring in а nonautonomous auto stochastic system

## An analysis of processes occurring in а nonautonomous auto stochastic system

### S.А. Afanas'ev, D.А. Gribkov, and Уu.I. Kuznetsov

**1988**. N 6. P. 17

It is shown that а regular external disturbance outside synchronization regions leads to the smoothing of the spectral density of chaotic oscillations in auto-stochastic systems. Different scenarios of transition to chaos in а nonautonomous generator of chaotic oscillations that incorporates а tunnel diode are discussed.

Show Abstract## Snergy approach to the desciption of transverse-mode generation in injection lasers

## Snergy approach to the desciption of transverse-mode generation in injection lasers

### А.S. Logginov and А.G. Rzhanov

**1988**. N 6. P. 21

An analysis of the characteristic equation for the active waveguide of the injection laser with arbitrarily specified transverse geometry is used to derive and investigate the equation for the energy balance during transverse - mode generation.

Show Abstract## Characterization of defects observed in the scanning electron microscope in single -crystal $BaY_2F_8$ used in the vacuum ultraviolet

## Characterization of defects observed in the scanning electron microscope in single -crystal $BaY_2F_8$ used in the vacuum ultraviolet

### К.М. Devyatkova, О.N. Ivanova, V.V. Mikhailin, T.B. Uvarova, and S.Р. Chernov

**1988**. N 6. P. 26

Scanning electron microscopy was used to investigate the structure of single-crystal $BaY_2F_8$. The experirnental results indicate that the structure factor contributes to the optical spectra of the single crystals.

Show Abstract## Numerical simulation of the plasma mirror produced on the surface of а semiconductor bу а picosecond pulse of adiation

## Numerical simulation of the plasma mirror produced on the surface of а semiconductor bу а picosecond pulse of adiation

### V.Т. Platonenko and O.Р. Popova

**1988**. N 6. P. 31

А numerical simulation is reported of the production of а plasma mirror on the surface of silicon bу picosecond laser pulses. The dependence of the mirror lifetime on the parameters of the exciting pulse and the properties of the silicon surface is discussed.

Show Abstract## Determination of the probability of absorption of light in free -free transitions

## Determination of the probability of absorption of light in free -free transitions

### V.D. Kukin, V.S. Rostovskii, and N.Р. Yudin

**1988**. N 6. P. 38

The evaluation of the matrix element sof the electric dipole transition between states in the continuous spectrum is discussed. Recurrence relations are obtained for the contribution to the matrix elements of the integral evaluated over the region outside the atom in terms of the values of the wave functions and their derivatives on the boundary.

Show Abstract## Spectral methods of determining acousto-optical diffraction bу а bounded sound beam

## Spectral methods of determining acousto-optical diffraction bу а bounded sound beam

### M.А. Voronova and V.N. Parygin

**1988**. N 6. P. 43

The Bragg diffraction problem is solved for а bounded sound beam, using а new method employing а four- dimensional spectral representation of the light and sound beams.

Show Abstract## Raman scattering of light in $\alpha$- quartz exposed to small doses of reactor and $\gamma$ - radiation

## Raman scattering of light in $\alpha$- quartz exposed to small doses of reactor and $\gamma$ - radiation

### L.Р. Avakyants, D.F. Keselev, and М.М. Firsova

**1988**. N 6. P. 50

The use of modern techniques in the investigation of Raman scattering in $\alpha$- quartz exposed to small reactor doses was used to separate the influence of neutron and $\gamma$ - components on the spectrum and to demonstrate the presence of а small frequency shift of the Raman lines.

Show Abstract## Mirrors with а 180° phase difference at oblique incidence

## Mirrors with а 180° phase difference at oblique incidence

### N.V. Grishina, А.V. Tikhonravov, and N.Е. Shapkina

**1988**. N 6. P. 54

The synthesis of reflecting coatings with а 180° phase difference between the s and р cornponents of the reflected field at an angle of incidence of 45° in the wavelength range $\Delta \lambda /\lambda=\pm 5 \%$ is discussed. Exarnples of synthesized systerns are reproduced.

Show Abstract## Phase transitions and the magma formation problem

## Phase transitions and the magma formation problem

### М.V. Avdulov

**1988**. N 6. P. 58

Periodic temperature variations are accompanied bу а separation of the Earth's mantle into mineralogical fractions at temperatures below the solidus point of rock. А physical model is put forward for the formation of magmatic melts of different chemical compositions.

Show Abstract## Inelastic scattering of X-rays in the case of diffraction bу crystals with а damaged surface layer

## Inelastic scattering of X-rays in the case of diffraction bу crystals with а damaged surface layer

### V.А. Bushuev and Т. Сhen

**1988**. N 6. P. 64

А dynarnic theory of Cornpton and therrnal diffusion scattering during the diffraction of X-rays Ьу perfect crystals with an epitaxial filrn on the surface is developed.

Show Abstract## Solitions in а domain wall

## Solitions in а domain wall

### L.I. Antonov, А.N. Matveev, and Р.А. Polyakov

**1988**. N 6. P. 71

It is shown that а nonlinear dynamic structure such as а soliton can appear in the domain wall of а massive magnetic sample.

Show Abstract## Effect of all- sided pressure on the magnetization of single crygtal terbium

## Effect of all- sided pressure on the magnetization of single crygtal terbium

### S.А. Nikitin and R.V. Bezdushnyi

**1988**. N 6. P. 76

The effect of all-sided pressure on the rnagnetization of single-crystal terЫurn is investigated. Giant volurne magnetostriction, $\sim 650\cdot 10^{-6}$, is found. The dependence of the magnetic anisotropy constant $K_6$ on pressure is found to bе described bу а single-ion theory of magnetic anisotropy.

Show Abstract## Defect formation in GaAs and GaAsP under the influence of the excimer laser radiation

## Defect formation in GaAs and GaAsP under the influence of the excimer laser radiation

### А.I. Efimova, Р.К. Kashkarov, М.S. Dzhidzhoev, and V.К. Popov

**1988**. N 6. P. 82

The effect of excimer-laser pulses on the photoluminescent properties of GaAs and GaAsP was investigated. It was shown that, depending on the initial defects present in the samples, the laser pulses give rise to the generation of annihilation of radiationless recombination centers.

Show Abstract## Reduction problems in the case of an unknown correlation operator

## Reduction problems in the case of an unknown correlation operator

### Yu.Р. Pyt'evand M.L. Serdobol'skaya

**1988**. N 6. P. 87

An analysis is given of the reduction of experimental data for models with an а priori unknown correlation operator representing measurement uncertainties.

Show Abstract## Deterioration in temporal coherence of а light pulse with random spatial modul ation in the case of time-dependent thermal self- interaction

## Deterioration in temporal coherence of а light pulse with random spatial modul ation in the case of time-dependent thermal self- interaction

### V.А. Aleshkevich, G.D. Kozhoridze, and А.N. Matveev

**1988**. N 6. P. 90

An analytic study is reported of the deterioration in the temporal coherence of а powerful light pulse that is randomly modulated in space during time-dependent thermal self-interaction. Expressions are obtained for the beam width, radius, and coherent time.

Show Abstract## Measurement of the nonlinearity of liquid dielectrics in submicron gaps

## Measurement of the nonlinearity of liquid dielectrics in submicron gaps

### F.V. Bulygin and S.Р. Vyatchanin

**1988**. N 6. P. 94

А method has been developed for measuring а submicron capacitive gap and to determine its size without direct measurement. The quadratic dielectric nonlinearity of а number of liquid dielectrics has been measured for the first time in the microwave range.

Show Abstract## Application of the introscopic sensitive- point method to the stabilization of the spin oscillator using an inhomogeneously broadened line

## Application of the introscopic sensitive- point method to the stabilization of the spin oscillator using an inhomogeneously broadened line

### N.V. Anisimov and Yu.S. Konstantinov

**1988**. N 6. P. 98

An application of the sensitive- point method to the staЫlization of the multifrequency output of а spin oscillator is discussed. The possible use of two-frequency gradient modulation in increasing the resolution of the NMR spectrometer is examined.

Show Abstract## Classification of singular points of the streamlines of active and reactive intensity in the near field due to sources of sound

## Classification of singular points of the streamlines of active and reactive intensity in the near field due to sources of sound

### А.N. Ivannikov and D.I. Kravchenko

**1988**. N 6. P. 101

А classification is given for the singular points of streamlines of the active and reactive intensity. It is shown that active intensity has singular points in the form of а center or saddle, whereas reactive intensity has singular points in the form of а node or saddle.

Show Abstract## Theoretical desciption of thermal self- focusing of saw- tooth acoustic waves

## Theoretical desciption of thermal self- focusing of saw- tooth acoustic waves

### О.V. Rudenko and O.А. Sapozhnikov

**1988**. N 6. P. 106

The geometric acoustic approximation used to analyze thermal selffocusing of saw-tooth waves. The analysis shows that the results differ significantly from those estaЬlished previously for harmonic waves.

Show Abstract## Effect of а tropical cyclone on ocean surface

## Effect of а tropical cyclone on ocean surface

### V.V. Alekseev and N.S. Evsa

**1988**. N 6. P. 109

The reaction of ocean surface to а tropical cyclone (ТC) is discussed in terms of the "shallow water" model. The variation in the quasihomogeneous layer is described bу the Pollard model, and а distribution of the surface level of the ocean is obtained for different TC parameters.

Show Abstract## Galvanomagnetic effects in germanium- doped indium antimonide under deep irradiation with fast electrons

## Galvanomagnetic effects in germanium- doped indium antimonide under deep irradiation with fast electrons

### N.В. Brandt, Е.Р. Skipetrov, V.V. Dmitriev, G.I. Kol'tsov, and Е.А. Ladygin

**1988**. N 6. P. 113

It is shown that p-n conversion under electron bombardment of $р-InSb\langle Ge\rangle$ samples, the electron concentration passes through а maximum, and а limiting state with n- type conductivity is reached. These re sults are explained in terms of the formation of complexes consisting of primary defects and impurity atoms.

Show Abstract## Deformation mechanism for the metal- semiconductor phase-transit ion temperature of а $VO_2$ film due to absorption

## Deformation mechanism for the metal- semiconductor phase-transit ion temperature of а $VO_2$ film due to absorption

### V.I. Emel'yanov, N.L. Levshin, and А.L. Semenov

**1988**. N 6. P. 117

А theoretical study is reported of the effect of absorption of molecules on the semiconductor- metal phase - transition temperature in $VO_2$ films. The theoretical predictions are compared with experimental data.

Show Abstract## The state of dipolar glass in PbGeTeSe solid solutions produced along the PbSe- GeTe section of the phase diagram

## The state of dipolar glass in PbGeTeSe solid solutions produced along the PbSe- GeTe section of the phase diagram

### A.I. Lebedev and I.А. Sluchinskaya

**1988**. N 6. P. 121

Samples of $n-Pb_{1-x}Ge_xTe_{1-y}Se_y$ with $y\approx 1$ and germanium concentration below the threshold for the onset of ferroelectric properties were found to exhibit low- temperature electron scattering. This was explained bу the appearance of disordered dipolar structure of the dipole glass type in these systems.

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