Kinetic processes in the electric discharge in SF6

The simulation of the kinetic processes in the spatially homogeneous and heterogeneous plasma of the gas discharge in SF6 is performed. The calculated time dependences of the rates of the most important processes and the concentrations of electrons, ions, and other particles that affect the plasma characteristics are presented. The calculated and experimental results are compared. The kinetic processes are analyzed and their effect on the plasma characteristics is demonstrated. The calculated data regarding the development of the plasma channel are presented. An increase in the conductivity inside the channel is discussed. Original Text ? Astro, Ltd., 2006.     

On the dynamics of a curved deflagration front

An equation describing evolution of a curved deflagration front of finite thickness is obtained for the case of an arbitrary equation of state of the “fuel”, an arbitrary type of energy release and an arbitrary type of thermal conduction. The equation is complemented by conservation laws for the mass flux and the momentum flux through the deflagration front of finite thickness. As an illustration of the method, the growth rates and the cutoff wavelengths for the linear stage of the flame instability are calculated for the case of a flame in an ideal gaseous fuel and for the case of a thermonuclear deflagration propagating in a strongly degenerate matter of white dwarfs. Zh. éksp. Teor. Fiz. 111, 514–527 (February 1997) Published in English in the original Russian journal. Reproduced here with stylistic changes by the Translation Editor.     

129I-Mössbauer study of molecular dynamics in the organic superconductor β-(BEDT-TTF)2I3

¹²⁹ I-Mössbauer spectroscopy was applied to study the organic superconductor β _H -(BEDT-TTF)₂ I ₃ withT _c=8 K. The measurements were performed in the temperature range 1.4 K to 160 K. A detailed analysis of the well-resolved spectra, including transmission integral fits, revelas information about the hyperfine interactions and the local binding strength (f-factor) for the terminal and central sites of the linear and symmetricI ₃ ^? anion. A change in the local Debye temperature of both sites of theI ₃ ^? anions is observed around 120 K, where a phase transition was monitored by other methods. Most interesting with respect to the superconducting properties is a change of the relative intensities of the terminal and central iodine sites, which starts below 10 K and increases down to 1.4 K. This behaviour may be attributed to a libral motion of the iodine molecules and seems to be connected with the occurence of superconductivity in this system.     

Characteristics of volume discharge in gaps with a small interelectrode separation

This paper examines the excitation conditions, ignition ranges, and also the energetic characteristics of high-pressure volume discharge. It is shown that, using the UV radiation of an auxiliary discharge to preionize the active medium, volume discharge turns out to be substantially more stable than if weak x-ray radiation is used, creating an initial electron concentration 10⁸ cm^–3. Data are cited which indicate that the energy entering the gas with the primary discharge increases in proportion to the increase of energy dissipated in the auxiliary discharge. Several results are reported about the effect of electric field homogeneity on the nature of the discharge progression.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 89–94, April, 1986.     

Infrared spectra of triorganoacyloxysilanes and their isologs

Conclusions An analysis of the IR spectra of the compounds R₃MOCOR, where R and R=CH₃, C₂H₅ or C₆H₅, testify to a competition between , p-conjugation and d–p-interaction in the M-O bond (for M=Si, Ge), and to the formation of M...O coordination bonds (for M=Sn, Pb).Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 164–166, January, 1971.     

A study of the equation for an energy gap on the basis of the fluctuation theory of high-temperature superconductivity

The equation for an energy gap is investigated using the fluctuation theory of high-temperature superconductivity. It is shown that the proposed mechanism can explain an increase in critical temperature, T _c . An explicit expression for the critical temperature is obtained using the technique of rectangular pits.     

Sorption of cadmium ions from aqueous solutions onto nanoporous modified carbon sorbents

Physicochemical properties of nanoporous modified carbon sorbents and sorption of cadmium ions (0.1–20 mg L^?1) onto them from nitrate solutions at pH 5–7 were studied. The acid-base nature of functional oxygen-containing groups on the carbon surface of the sorbents was determined. The ability to sorb cadmium ions depends on the kind of chemical modification of the sorbent surface.