Backscattering of light ions from the surfaces of inhomogeneous multicomponent amorphous materials

An analytic theory proposed in Ref. 1 [V. S. Sukhomlinov and é. N. Fafurina, Zh. Tekh. Fiz 65(4), 9 (1995); Tech. Phys. 40, 295 (1995)] for the backscattering of light ions by a solid surface is developed for the cases of multicomponent materials and materials in which the concentrations of some of its components vary with depth. Zh. Tekh. Fiz. 67, 17–21 (January 1997)     

On the critical distance in heavy-ion collisions

An analytical expression is obtained for the electron energy term by solving a two-center Dirac problem. This expression has the correct asymptotic form in two limiting cases — the Popov approximation and the nonrelativistic problem. Zh. Tekh. Fiz. 69, 135–137 (August 1999)     

Multipole solutions of the wave equation

The wave equation is solved by the operator separation method proposed in V. V. Zashkvara and N. N. Tyndyk, Zh. Tekh. Fiz. 61(4), 148 (1991) [Sov. Phys. Tech. Phys. 36, 456 (1991)]. Solutions describing the evolution of circular-multipole fields are obtained in a cylindrical coordinate system. Zh. Tekh. Fiz. 68, 9–14 (June 1998) Deceased.     

Nonelectrical method of pumping solid-state lasers

An alternative, nonelectrical method for obtaining a dense radiating plasma and the possibilities of using this method to pump solid-state lasers are investigated. The plasma was obtained experimentally by heating the working gas in a two-stage ballistic plasmatron. A new device — a vortex chamber — is proposed for transferring energy into the plasmatron-laser system. Zh. Tekh. Fiz. 68, 67–70 (September 1998)     

Critical fields and currents in a weakly nonlinear medium near the percolation threshold

For fields above a critical value the expansion of the conductivity in powers of the field ceases to be valid and the weak-nonlinearity approximation no longer works. The density behavior of the critical fields in strongly inhomogeneous media near the percolation threshold is found on the basis of two criteria—an average criterion and a local criterion. The parameter values of the medium for which crossover—a change of the critical behavior—occurs are determined. Similar calculations are performed for the critical currents. Zh. Tekh. Fiz. 68, 5–8 (June 1998)     

Effect of magnetic field pulses on the anelastic properties of nitrogen-containing steel

The effect of weak magnetic field pulses on the dynamic properties of dislocations interacting with impurity-defect complexes is determined by the internal-friction method. The effect is characterized by an increase in the plasticity of a material under the conditions of microplastic deformation and slowing of strain hardening. Zh. Tekh. Fiz. Zh. Tekh. Fiz. 69, 122–123 (August 1999)     

Breakup of charged drops into droplets of comparable dimensions under strong spheroidal virtual deformations

On the basis of the principle of minimization of energy of a closed system in which spontaneous processes are occurring, we investigate the breakup of a highly charged drop into two and three droplets of comparable dimensions under conditions of virtual spheroidal deformations. Zh. Tekh. Fiz. 68, 31–38 (August 1998)     

Dispersing of a charged drop in an electrostatic field

The characteristics of the breakup of a charged drop in a uniform electrostatic field are calculated on the basis of Onsager’s principle of minimum dissipation of energy in nonequilibrium processes. The ranges of the physical parameters where daughter droplets are emitted from two tips and from one tip of an unstable parent drop and when emission is completely absent are found. The dimensionless radii, charges, and specific charges of the daughter droplets are determined. Zh. Tekh. Fiz. 69, 26–30 (December 1999)     

Jet engine electrification as a phenomenon reflecting the evolution of charge instability in an outflowing combustion product mixture

It is hypothesized that charge instabilities developing in a mixture of outflowing combustion products make some contribution to the mechanism of engine electrification in jet engines. Investigations are carried out which support this hypothesis. Zh. Tekh. Fiz. 67, 21–26 (August 1997)     

Parametric excitation of spin waves in uniaxial ferrites

Parametric excitation of spin waves in uniaxial ferrites with large anisotropy is investigated theoretically. First-order processes in a sphere with arbitrary orientation of an external static magnetic field, in which case the pumping is oblique, are studied. The threshold field and the parameters of the excited spin waves are calculated numerically for two ferrites — easy-axis and easy-plane. Zh. Tekh. Fiz. 68, 65–71 (May 1998)     

Electron-beam tomography of the density of a gas in hypersonic flow around objects

A procedure is developed for the tomographic reconstruction of the distribution of the gas density from measurements data on the attenuation of a sensing beam of fast electrons. The measurements and reconstruction are carried out for symmetrical and asymmetrical conical objects in a low-density hypersonic flow (M=21). Zh. Tekh. Fiz. 68, 125–133 (April 1998)     

Reciprocity relations for the nonlinear conductivity of fractal resistors

Reciprocity relations are derived for the conductivity of finite-size samples of inhomogeneous weakly nonlinear two-dimensional media. Zh. Tekh. Fiz. 68, 121–124 (November 1998)     

Transition states in the melting of germanium in dynamic and quasistatic regimes

The conditions under which transition states arise and exist during the melting of germanium are identified by digital differential-thermal analysis. The pre-and postmelting cooperative effects arising under real conditions in dynamic and quasistatic regimes are nonequilibrium phase transitions and can be characterized by a system of thermodynamic parameters. Instability of the thermodynamic parameters of the transition states is observed in quasistatic regimes as a result of dynamic instability. The system of parameters introduced characterizes the formation of a special phase state — pre-and postmelting mesophases. Zh. Tekh. Fiz. 69, 57–61 (December 1999)     

Influence of an internal getter in silicon on the parameters of Au-Si structures

It is shown that internal gettering of impurities and defects in Au-Si structures can enhance their reliability and stabilize their characteristics. Zh. Tekh. Fiz. 69, 129–131 (June 1999)     

Enhancement of the measurement sensitivity in real-time optical image processing for objects with a periodic structure

A possible method of real-time visualization of large-scale objects giving enhanced measurement sensitivity using incoherent illumination is reported. Zh. Tekh. Fiz. 69, 138–139 (July 1999)     

Inhibition of the growth of excrescences in mixed electronic-ionic conductors

The thermodynamic aspects of the diagnosis, prevention, and inhibition of the growth of excrescences in mixed electronic-ionic conductors are considered in the case of the representative material copper selenide. Zh. Tekh. Fiz. 68, 67–71 (November 1998)     

Influence of deformation on the force characteristics of shape memory effects in alloys based on titanium nickelide

Studies of the influence of plastic deformation and the straining temperature on the temperature dependence of the stresses developed in titanium nickelide shape memory alloys are described. Zh. Tekh. Fiz. 68, 141–142 (July 1998)     

Development of a system of anticoronal shields for the ion beam injector and accelerator of a diagnostic complex for plasma physics research

A system of anticoronal shields is proposed, designed, and tested. The system is found to work efficiently. Zh. Tekh. Fiz. 68, 106–109 (November 1998)     

Enhancing the intensity of x-ray reflection from surfaces by depositing diamondlike carbon films on them

The possibility of fabricating reflecting surfaces with a roughness low enough for x-ray optics is demonstrated experimentally. Zh. Tekh. Fiz. 68, 136–138 (July 1998)     

Yet another contribution to the question of the stabilization of an extended glow discharge in a transverse gas flow

The instability of a discharge in a transverse gas flow is studied experimentally. It is shown that the characteristics of the source influence the stability. Zh. Tekh. Fiz. 69, 38–41 (December 1999)