[en] To produce rapidly crystallized particles of the melts on the basis of zirconium dioxide, partially stabilized by yttrium oxide with numerous defects a facility for particle production by means of rapid crystallization from melts was developed. To increase physicomechanical properties of the products the main efforts were directed to reduction of powder initial particle size up to 0.5 μm and, as a consequence, to the increase in the powder specific surface. It is shown that powders with specific surface value up to 20 m²/g and with equivalent particle size of approximately 95 nm from high-strength granules of the above-mentioned composition in the system studied can be produced only when using combined method of grinding: vibrogrinding (up to 60 h), subsequent attrition grinding (up to 3 h), explosion treatment and repeated grinding in a high-energy attritor

[en] Structural and magnetic properties of the iron containing clusters in petrol pitchs (JCCP), produced by mixing of petrol pitch's matrix with iron carbonyl complex, was studied by Moessbauer spectroscopy and magnetization measurements. (orig.)

[en] The effects of preliminary heat treatment, specimen length, and elastic tensile stresses on magnetic properties of metallic wires of Fe₇₅Si₁₀B₁₅ composition are investigated. It is found that the temperature of pretreatment and the length of wires affect essentially on their magnetic properties. With a wire length decrease at the dependence of differential magnetic permeability on external magnetic field a portion of curve occurs where the permeability remains constant. This is testimony to the change of main magnetization mechanism in the wires. It is shown that the course of experimental dependences of coercive force and differential magnetic permeability on applied tensile stresses can be explained in the framework of the model of motion of Bloch walls which separate the oppositely magnetized domains in the core of the wire with a dissipative term being taken into account

[en] Sufficiently rare in chemistry reaction of GaSe and InSe interaction with HNO₃ is discovered and investigated. During the reaction takes place substance implantation being accompanied by production of the fragments of the type C-OH, Se-OH, Se-O, connected with the crystal matrix. Their reaction may be compared only with graphite interaction with oxidizer-acids. Unlike graphite the interaction occurs selectively along polytype boundaries. 8 refs.; 2 figs

[en] We consider the application of the heterodyne signal detection technique to measure the atmospheric transmission spectrum in the near-IR range, which makes it possible to measure for the first time the contour of a separate line of the vibrational – rotational CO₂ band on the solar observation path with a high spectral resolution of λ/δλ = 10⁸. Together with other characteristics of the instrument, this enables us to measure the carbon dioxide content in the atmospheric column with high accuracy. The experimental setup and measurement technique are described. The existing facilities for measuring the content of greenhouse gases in the atmosphere are compared, demonstrating the possibility of using the near-IR heterodyne spectroradiometry to develop a useful and competitive instrument that can be used in building new networks of ground stations to monitor greenhouse gases. (laser spectroscopy)

[en] The results of the experimental study on the dynamics of the bronze large (of the order 70-180 μm) spherical particles in the direct current glow discharge under the microgravitation conditions are presented. The temperatures velocities, pair correlation functions and macroparticles self-diffusion coefficients by the discharge current different values are measured. The registered charges (of the order 10⁶ e) of the dust particles corresponded to the high surface potentials of the order 30-40 V. The experimental data agree well with the results of the Yukawa system modeling under the conditions of the dust charges low screening. The effect of the macroparticles on the processes of the equilibrium ionization in the dense dust cloud is considered

[en] The dynamics of large-sized (70-180 μm) spherical bronze particles in a direct current glow discharge plasma was studied experimentally under microgravitation conditions. The temperatures, velocities, pair correlation functions, and self-diffusion coefficients of macroparticles were measured at various discharge currents. The charges of dust particles (on the order of 10⁶ e) corresponded to high surface potentials of about 30-40 V. The experimental data were in close agreement with the simulation data on Yukawa systems with weak screening of dust charges. The influence of macroparticles on equilibrium ionization in a dense dust cloud was considered

[en] We report values for the neutron electric to magnetic form factor ratio, G_En/G_Mn, deduced from measurements of the neutron's recoil polarization in the quasielastic ²H((rvec e), e(prime)(rvec n)) ¹H reaction, at three Q² values of 0.45, 1.13, and 1.45 (GeV/c)². The data at Q² = 1.13 and 1.45 (GeV/c)² are the first direct experimental measurements of GEn employing polarization degrees of freedom in the Q² > 1 (GeV/c)² region and stand as the most precise determinations of GEn for all values of Q²