Vortex chains travelling with discrete velocities

It has been shown that Swihart waves slowing down caused by Josephson junction spatial dispersion leads to the new field periodic nonlinear vortex states moving with discrete velocities. Swihart waves trapping by periodic vortex structures is discovered.     

Observation of the ionization wave and the shock wave ahead of the plasma jet generated in the plasma focus discharge

An ionization wave travelling ahead of the shock wave of the plasma jet, propagating in residual gas (nitrogen) of the plasma focus discharge, is detected by the laser-interferometry method at the plasma focus. Radial and axial distributions of electron densities of the shock wave and plasma jet are measured.     

Wannier-mott excitons in narrow-gap semiconductor heterostructures

Spectra of excitons in a bulk semiconductor and in a thin semiconducting layer are investigated in the two-band Dirac model. The dependences of the exciton binding energy on the energy gap and, in the two-dimensional case, on the layer width are obtained. The fine structures of exciton spectra are revealed.     

On the decay of generalized Swihart waves

For Josephson junctions in sandwich geometry and in thin-film geometry we formulate the equations of nonlocal electrodynamics which take account of the influence of normal electrons in superconductors. On the basis of these equations we examine the spectrum and decay of generalized Swihart waves. We find that the decay of these waves by normal electrons becomes especially prominent in the short-wavelength region. Comparison of various dissipation mechanisms has revealed the conditions for efficient emission of electromagnetic waves from Josephson structures with finite dimensions. Fiz. Tverd. Tela (St. Petersburg) 41, 1160–1167 (July 1999)     

A Model of Buoyancy-Driven Two-Phase Countercurrent Fluid Flow

We seek simple analytical solutions in a model of gas flow driven by a combination of buoyancy, viscous, and capillary forces. Traveling-wave solutions describe propagation of the top and bottom of the gas plume. The top of the plume has low gas saturation, but propagates much faster than the bottom. The theoretical maximum of the velocity of propagation of the top of the plume provides a simple conservative estimate of the time until plume evolution will dramatically slow down. A sequence of rarefaction and traveling-wave solutions characterizes the transition zones between the top and bottom stable regions. The analytical results are applied to studying carbon dioxide flow caused by leaks from deep geological formations used for CO₂ storage. The results are also applicable for modeling flow of natural gas leaking from seasonal gas storage, or for modeling of secondary hydrocarbon migration.     

继承转型发展——2008年全国化学学科教育转型研究学术论坛综述

全国化学学科教育转型研究学术论坛涉及新时期高师化学学科教育的定位、化学教学论课程与教学范式的转型、化学教育研究的领域与方法的转型等方面的内容,本文对此予以综述,并对未来我国化学学科教育研究的方向进行了讨论。     

Periodic Orbits and Bifurcations of the Vibrational Modes of the Ozone Molecule at High Energies

Russian Physics Journal - The study of quantum states near the dissociation threshold is necessary both to understand the formation of molecules and to explore accurately chemical reactions....     

Theory of turbulent heating of current DT plasma

The theory of turbulent heating in the mode of hot deuterium ions and cold tritium ions is developed for plasma with equal deuterium and tritium ion concentrations. The possibility of heating electrons and deuterium ions by thousands of times is shown.     

Synthesis of Li-ion Battery Cathode Materials Based on Lithiated Transition Metal Oxides by Spray Method

The parameters of synthesis by the spray method of cathode materials Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ and Li_1.25Ni_0.12Co_0.12Mn_0.51O₂, differing in lithium content were studied. The phase and granulometric composition, the morphology of the powder particles obtained, as well as an influence of temperature, total metal concentration, and pH of the solution on the properties of powders of cathode materials were studied. The discharge capacities of the obtained materials reached 260 mAh g^?1 in the range of 2.5?4.8 V.