Effective attraction between oscillating electrons in a plasmoid via acoustic waves exchange

We consider the effective interaction between electrons due to the exchange of virtual acoustic waves in a low temperature plasma. Electrons are supposed to participate in rapid radial oscillations forming a spherically symmetric plasma structure. We show that under certain conditions this effective interaction can result in the attraction between oscillating electrons and can be important for the dynamics of a plasmoid. Some possible applications of the obtained results to the theory of natural long-lived plasma structures are also discussed.Comment: 14 pages in LaTeX2e, two columns, 3 eps figures; minimal changes, some typos are corrected; version published on-line in Proc. R. Soc.

Observation of superluminal geometrical resonances in Bi2Sr2CaCu2O8+x intrinsic Josephson junctions

We study Fiske steps in small Bi2Sr2CaCu2O8+x mesa structures, containing only few stacked intrinsic Josephson junctions. Careful alignment of magnetic field prevents penetration of Abrikosov vortices and facilitates observation of a large variety of high quality geometrical resonances, including superluminal with velocities larger than the slowest velocity of electromagnetic waves. A small number of junctions limits the number of resonant modes and allows accurate identification of modes and velocities. It is shown that superluminal geometrical resonances can be excited by subluminal fluxon motion and that flux-flow itself becomes superluminal at high magnetic fields. We argue that observation of high-quality superluminal geometrical resonances is crucial for realization of the coherent flux-flow oscillator in the THz frequency range

Fractional Models of Cosmic Ray Acceleration in the Galaxy

Possible formulations of the problem of cosmic rays acceleration in the interstellar galactic medium are considered with the use of fractional differential equations. The applied technique has been physically justified. A Fermi result has been generalized to the case of the acceleration of particles in shock waves in the supernovae remnants fractally distributed in the Galaxy.Comment: 10 page

Spin-controlled Mott-Hubbard bands in LaMnO_3 probed by optical ellipsometry

Spectral ellipsometry has been used to determine the dielectric function of an untwinned crystal of LaMnO_3 in the spectral range 0.5-5.6 eV at temperatures 50 K < T < 300 K. A pronounced redistribution of spectral weight is found at the Neel temperature T_N = 140 K. The anisotropy of the spectral weight transfer matches the magnetic ordering pattern. A superexchange model quantitatively describes spectral weight transfer induced by spin correlations. This analysis implies that the lowest-energy transitions around 2 eV are intersite d-d transitions, and that LaMnO_3 is a Mott-Hubbard insulator.Comment: 4 pages, 4 figure

lmmuno Histochemical Profile of Endometrium in Patients With Genital Endometriosis

The aim of present study was to investigate the occurence of different lymphocyte subsets in the endometrium of endometriosis patients and in healthy women on every day of the menstrual cycle with special emphasis to the proliferative activity of endometrial cells with Ki-S3 antibody. We also conducted immunohistochemical studies of T-lymphocytes, B-lympho-cytes, macrophages, natural-killer-cells and also of antigens class II of the histocompatibility complex (HLA-DR) during the different phases of the menstrual cycle in endometriosis and non-endometriosis patients

The algorithm of interaction of the enterprises of fuel and energy complex in implementation with the use of alternative means of payment

The structure of the algorithm for building a system of payment interaction of enterprises of the fuel and energy complex has been off red. The necessity to include such intangible components as trust, business reputation, transparency of economic relations in the assessment of the value of assets of the fuel and energy complex enterprises has been highlighted. The possibility of wider application of mechanisms of non-monetary trade in the conditions of economy of “distrust” and political and economic crisis has been designated. The peculiartities of cooperation between the enterprises of the fuel and energy complex in the conditions of sanctions pressure, turning into a trade war have been revealed. The possibilities of activation and development of resource trade as one of the main factors of increasing the security of the fuel and energy complex and the Russian economy as a whole have been discovered

Методика структурно-параметрической оптимизации каскадных систем автоматического регулирования на основе модифицированного упредителя Смита

The paper presents methodology for structural and parametric optimization of cascade ACS   technological parameters of thermal power processes which has been developed on the basis of a modified Smith predictor. The given methodology permits significantly to improve quality of regulation in comparison with the typical cascade AСS. Разработана методика структурно-параметрической оптимизации каскадных САР технологических параметров теплоэнергетических процессов на базе модифицированного упредителя Смита. Данная методика позволяет существенно улучшить качество регулирования по сравнению с типовой каскадной САР