R e g u l a r p a p e r s

Theoretical and mathematical physics

Moscow University Physics Bulletin 2003. **58**. N 3. P. 7

The two-loop anomalous dimension in $N=1$ supersymmetric electrodynamics regularized by loop momentum cutoff has been calculated.

Show AbstractAtomic and nuclear physics

Moscow University Physics Bulletin 2003. **58**. N 3. P. 13

The results of experimental measurements of the distributions of charge fractions $F_i$ in ion beams on passing through thin celluloid films differing in thickness are used to calculate the charge-exchange cross sections of high-speed ions with due regard for the transfer both of a single electron and of two electrons simultaneously. The results are presented of calculating the mean charges $\hat I$ and equilibrium target thickness $t_{\rm eq}$ for Be, B, N, and О ions differing in initial charges and moving with a velocity of $V=3.6$ a.u. It is demonstrated that allowing for the loss and capture of two electrons simultaneously accelerates the establishment of charge equilibrium.

Show AbstractOptics and spectroscopy

Moscow University Physics Bulletin 2003. **58**. N 3. P. 17

This paper theoretically analyzes excitation of linearly polarized waves in ring chip lasers both of plane and nonplane geometry.

Show AbstractAcoustics and molecular physics

Moscow University Physics Bulletin 2003. **58**. N 3. P. 22

A new method for measuring the thermal expansion coefficient of conducting liquids has been suggested; its essential feature is a simultaneous application of two types of modulation action of different physical nature on the specimen under examination. A device for implementing the suggested method has been described. The method has been tested by studying the change of the thermal expansion coefficient of distilled water in the temperature range of 20—40°C.

Show AbstractMoscow University Physics Bulletin 2003. **58**. N 3. P. 30

A change in the phase diagram of two liquid binary mixtures (methanol—heptane and methanol—hexane) was found to occur under the effect of a change in the areas of a free surface and a liquid—wall interface.

Show AbstractSolid state physics

Moscow University Physics Bulletin 2003. **58**. N 3. P. 76

The results of our Mossbauer investigations of ferrite Zno.4Feo.6fNio.6Cr1.4lO4 and compositions of the system CuFe$_{2-x}$Cr$_x$O$_4$ ($x=0.2$, $1.0$, $1.4$) confirmed the assumption that in ferrites of this system, the frustration degree in an A sublattice increases with the growth of the substitution parameter x, as a result of which the spontaneous magnetization relationship $x\ge1.0$ of the N type becomes anomalous.

Show AbstractGeophysics

Moscow University Physics Bulletin 2003. **58**. N 3. P. 38

series of experiments using correlation and spectral analysis has been performed to study the spatial structure of a liquid, in which turbulence is set by a vibrating grid. The experiments have shown that there are three regions of motion in such a liquid: jet flow, transition, and random (turbulent) zones. Turbulence intensity in pure water and in suspension has been estimated and the vertical scale of turbulent formations has been determined. In suspension, part of turbulent energy of a liquid is absorbed by suspended particles.

Show AbstractMoscow University Physics Bulletin 2003. **58**. N 3. P. 43

This paper continues a series of articles devoted to numerical simulation of specific gravity measurements in motion. Mathematical formulas have been derived for simulating models of random processes including the displacement, rate of displacement and acceleration of a support caused by the ship rolling and pitching motion.

Show AbstractMoscow University Physics Bulletin 2003. **58**. N 3. P. 49

A numerical algorithm and software have been developed for solving a set of one-dimensional nonlinear equations of geophysical hydrodynamics that describe generation of acoustic—gravity waves resulting from earthquakes and strong explosions and their propagation to a great height in the atmosphere.

Show AbstractB r i e f r e p o r t s

Theoretical and mathematical physics

Moscow University Physics Bulletin 2003. N 3.

The reasons for difficulties in proving the existence of embedded trapped modes of waveguides have been discussed.

Show AbstractAtomic and nuclear physics

Moscow University Physics Bulletin 2003. **58**. N 3. P. 58

A new fitting-based iteration method to solve ill-posed problems has been proposed. The suggested method of piecewise fitting was approved in restoring the photonuclear process cross sections when studying bremsstrahlung $\gamma$-beams under limited experimental statistics.

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