"Cherenkov radiation" of a sound in a Bose-condensed gas

In terms of linearized Gross-Pitaevskii equation we have studied the process of sound emission arises from a supersonic particle motion in a Bose-condensed gas. By analogy with the method used for description of Vavilov-Cherenkov phenomenon, we have found a friction work created by the particle generated condensate polarization. For comparison we have found radiation intensity of excitations. Both methods gives the same result

The nonlinear damping of Bose-Einstein condensate oscillations at ultra-low temperatures

We analyze the damping of the transverse breathing mode in an elongated trap at ultralow temperatures. The damping occurs due to the parametric resonance entailing the energy transfer to the longitudinal degrees of freedom. It is found that the nonlinear coupling between the transverse and discrete longitudinal modes can result in an anomalous behavior of the damping as a function of time with the partially reversed pumping of the breathing mode. The picture revealed explains the results observed in [16]

Сопоставление данных гистологического и цитологического исследования при хроническом простатите

It has bee done comparison of the facts of cytological and histological analyses in case of chronic prostatitis. It has been established that 64 patient had mainly an acssudativ form of the inflammatory reaction, 49 patients had productive and 39 patients had proliferate phase of an acute inflammatory. PSA indexes more than 4 ng/ml have indicated the necessity of biopsy. This research, including the quantitative value of polumorphnonucleas leucocytes, eosynophyliq leucocytes, basophilic leucocytes, plasmatic cells, mononuclear leucocytes, and macrophages and fibroblast, has brought to light an absolute accordance of the facts cytological analyze. Which had been obtained by the exploration of secrets of prostate and the facts of histological analyze of byoptate of prostate

Phonon Hall effect in ionic crystals in the presence of static magnetic field

We study phonon Hall effect (PHE) for ionic crystals in the presence of static magnetic field. Using Green-Kubo formula, we present an exact calculation of thermal conductivity tensor by considering both positive and negative frequency phonons. Numerical results are shown for some lattices such as hexagonal lattices, triangular lattices, and square lattices. We find that the PHE occurs on the nonmagnetic ionic crystal NaCl, although the magnitude is very small which is due to the tiny charge-to-mass ratio of the ions. The off-diagonal thermal conductivity is finite for nonzero magnetic field and changes sign for high value of magnetic field at high temperature. We also found that the off-diagonal thermal conductivity diverges as $\pm{1/T}$ at low temperature

Exact Solution for the Critical State in Thin Superconductor Strips with Field Dependent or Anisotropic Pinning

An exact analytical solution is given for the critical state problem in long thin superconductor strips in a perpendicular magnetic field, when the critical current density j_c(B) depends on the local induction B according to a simple three-parameter model. This model describes both isotropic superconductors with this j_c(B) dependence, but also superconductors with anisotropic pinning described by a dependence j_c(theta) where theta is the tilt angle of the flux lines away from the normal to the specimen plane

Industrial electron accelerators type ILU

The paper describes ILU type industrial electron accelerators. Their main parameters, design, principle of action, electron beam extraction devices, wide set of auxiliary equipment for various technological processes and ways of their usage are discussed as well.Описаны промышленные ускорители электронов серии ИЛУ. Приведены основные параметры, устройство и принцип действия. Дается краткое описание систем выпуска ускоренного пучка в атмосферу для различных технологических процессов.Описано промислові прискорювачі електронів серії ЫЛП. Наведено основні параметри, будова і принцип дії. Дається короткий опис систем випуску прискореного пучку в атмосферу для різних технологічних процесів