A.B. Belonozhko, V.I. Emel'yanov, G.A. Paityan, A.A. Sumbatov

A thermal model is used to interpret experiments on probe-radiation reflection and second-harmonic generation SHG in reflection when a short laser pulse acts on GaAs. A formula is derived for SHG in reflection for the case where there is a layer of liquid of thickness d at the surface. Numerical calculations have been performed on the time dependence of d, the linear reflection coefficient, and the SHG for the probe radiation. There is good agreement between theory and experiment which supports the thermal model for laser annealing.

L.V. Levshin, A.M. Saletskii, V.I. Yuzhakov

A study has been made of the spectral and polarization characteristics of dye luminescence in two-component solvents. It is shown to be possible to determine structures in binary solvents from the luminescence of dissolved dyes.

V.G. Mozhaev, V.V. Krylov

Simple theory is proposed to explain the observed multiple oscillations in the reflection and transmission coefficients for surface Rayleigh waves at the edge of an elastic wedge, which are dependent on the vertex angle.

G.P. Petrova, A.S. Tleubaev

Measurements have been made on the spectra of the depolarized component of the Rayleigh scattering in the isotropic phase for two nematic liquid crystals; the temperature dependence of the anisotropy relaxation time $\tau$ has been derived. These $\tau$ data are compared with those from other sources, and it is concluded that the main contribution to the depolarized component comes from rapid rotation in the liquid-crystal molecules around their long axes.

A.A. Belykh, L.M. Voronin, A.A. Lazarev, К.V. Pokazeev

Results are presented from laboratory experiments on the effects of surfactant films on regular and wind-induced waves. For all the substances, there is a resonant-type frequency dependence for the ratio of the wave damping coefficients on water coated with surfactant to that on pure water. The surfactant films attenuate the wave spectra considerably and reduce the rates of increase in the spectral components by comparison with those on pure water under the same conditions.

N.P. Gorshkov

An experiment has been performed on very long-range averaging over the temperature stratification to derive the spectrum of the atmospheric-pressure fluctuations as a power law with index $n \approx -1.7$. The dependence of $n$ on the parameter $\zeta = z/L$ is given for smaller but still large averaging scales.

V.I. Trukhin, A.V. Bykov, V.A. Zhilyaeva, R.N. Kirillov, T.A. Nikitina, V.I. Nikolaev, V.S. Rusakov

Iron ores from the Kumdykol deposit have been used to examine the mechanism responsible for the reverse residual magnetization, which is responsible for the negative magnetic anomalies over the deposit. Magnetic parameters have been determined that characterize the stability of the natural residual magnetization and the phase composition of the ferromagnetic fraction. The phase analysis has been based in particular on data on the hyperfine electron-nuclear interactions obtained by means of Mossbauer spectroscopy.

E.V. Bogdanov, V.A. Kul'bachinskii, L.S. Fleishman, O.A. Bondaruk, I.N. Gorbatyuk, I.M. Rarenko

$Cd_xHg_{1-x}Te$ alloys with $x$ of 0.18-0.25 have been used in examining the voltage-current characteristics in fields up to 60 kOe at 4.2 K, while galvanomagnetic measurements have been made at 0.2-300 K. It is concluded that there is a nonmonotone dependence of the Hall coefficient on field at breakdown in materials with mixed conductivity, while the prebreakdown superlinear part of the voltage-current characteristic in a strong magnetic field is related to activation of electrons localized in potential wells.

G.B. Demidovich, S.N. Kozlov, M. Slavova

Measurements have been made on the mobility $\mu$ of ions on pyrolytic $SiO_2$ films at elevated humidity. It is found that $\mu$ is very much dependent on the $SiO_2$-film production temperature. It is considered that the main reason for this is increase in the microporositу as the pyrolysis temperature is reduced. It is concluded that the use of pyrolytic $SiO_2$ films as protective coatings will be effective only for sufficiently low degrees of microporosity.

Г.К. Чепурных