Maxwell-Bloch equation and Correlation function for penetrable Bose gas

We consider the quantum nonlinear Schr\"odinger equation in one space and one time dimension. We are interested in the non-free-fermionic case. We consider static temperature-dependent correlation functions. The determinant representation for correlation functions simplifies in the small mass limit of the Bose particle. In this limit we describe the correlation functions by the vacuum expectation value of a boson-valued solution for Maxwell-Bloch differential equation. We evaluate long-distance asymptotics of correlation functions in the small mass limit.Comment: LaTEX file, 20 pages, to appear J. Phys. A (1997

Legal certainty of legality principle in the legislation of the continental and anglo-american system

In this article, through the comparative legal analysis of domestic, as well as foreign constitutional and criminal law norm content, various approaches to the principle of legality and its main features were examine

The measurement of sport culture identity development level

Management of students’ sport culture identity development in the process of sport oriented physical education should be based on provided information about the dynamics of its development objectively and quantitatively. The article presents the criteria and indicators of sport culture identity development and adequate techniques for their measurementУправление формированием спортивной культуры личности студентов в процессе спортивно ориентированного физического воспитания должно осуществляться с учетом объективной и количественно представляемой информации о динамике ее развития. В статье представлены критерии и показатели развития спортивной культуры личности и адекватные им методики их измерени

Investigation of oxidation process of mechanically activated ultrafine iron powders

The oxidation of mechanically activated ultrafine iron powders was studied using X-ray powder diffraction and thermogravimetric analyzes. The powders with average particles size of 100 nm were made by the electric explosion of wire, and were subjected to mechanical activation in planetary ball mill for 15 and 40 minutes. It was shown that a certain amount of FeO phase is formed during mechanical activation of ultrafine iron powders. According to thermogravimetric analysis, the oxidation process of non-milled ultrafine iron powders is a complex process and occurs in three stages. The preliminary mechanical activation of powders considerably changes the nature of the iron powders oxidation, leads to increasing in the temperature of oxidation onset and shifts the reaction to higher temperatures. For the milled powders, the oxidation is more simple process and occurs in a single step

Molecular genetic analysis SARS-CoV-2 of asymptomatic patients in Rostov region

Objective: conduct molecular genetics diagnosis of SARS-CoV-2 in asymptomatic individuals in the Rostov region.Material and methods: 22037 individuals who at the time of delivery of the material did not have clinically expressed symptoms of respiratory disease COVID-19 were examined. Molecular genetics diagnosis of SARS-CoV-2 was carried out by RT-PCR and LAMP with manual and automatic isolation of viral RNA.Results: a positive result would be detected in 297 individuals, the result would be confirmed by the regional reference center in 149 people (0.68 %). Among the total sample, 3090 “contact” patients were examined (78 people, or 2.52 %) found positive results, 8109 medical workers (23 cases positive, or 0.28 %) and 3098 “contact” health workers (24 cases positive, or 0.77 %).Conclusions: based on the results obtained, it can be concluded that the use of molecular genetic testing of SARS-CoV-2 for the detection of asymptomatic cases has serious limitations, therefore, for this diagnostic task, it is necessary to develop alternative laboratory diagnostic methods based on the features of the etiopathogenesis of a new coronavirus infection

International standards of penitentiary activity: impact on the development of the penitentiary activity of the CIS countries

Overcrowding in prisons is a common problem that affects many countries. It is difficult to define this term because there is no single internationally accepted standard. This article presents a comparative study of international standards for the activities of doctors in penitentiary institutions as an integral part of international standards of penitentiary activity. The authors investigated the methods and the degree of their impact on the penitentiary legislation of the Russian Federation and other CIS countries. The conclusion is drawn about the positive role of such standards in improving the national penitentiary legislation in order to increase the level of medical care for prisoner

INVERSE SCATTERING TRANSFORM ANALYSIS OF STOKES-ANTI-STOKES STIMULATED RAMAN SCATTERING

Zakharov-Shabat--Ablowitz-Kaup-Newel-Segur representation for Stokes-anti-Stokes stimulated Raman scattering is proposed. Periodical waves, solitons and self-similarity solutions are derived. Transient and bright threshold solitons are discussed.Comment: 16 pages, LaTeX, no figure

Search for invisible decays of sub-GeV dark photons in missing-energy events at the CERN SPS

We report on a direct search for sub-GeV dark photons (A') which might be produced in the reaction e^- Z \to e^- Z A' via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The A's would decay invisibly into dark matter particles resulting in events with large missing energy. No evidence for such decays was found with 2.75\cdot 10^{9} electrons on target. We set new limits on the \gamma-A' mixing strength and exclude the invisible A' with a mass < 100 MeV as an explanation of the muon g_\mu-2 anomaly.Comment: 6 pages, 3 figures; Typos corrected, references adde

Explicit solutions of the four-wave mixing model

The dynamical degenerate four-wave mixing is studied analytically in detail. By removing the unessential freedom, we first characterize this system by a lower-dimensional closed subsystem of a deformed Maxwell-Bloch type, involving only three physical variables: the intensity pattern, the dynamical grating amplitude, the relative net gain. We then classify by the Painleve' test all the cases when singlevalued solutions may exist, according to the two essential parameters of the system: the real relaxation time tau, the complex response constant gamma. In addition to the stationary case, the only two integrable cases occur for a purely nonlocal response (Real(gamma)=0), these are the complex unpumped Maxwell-Bloch system and another one, which is explicitly integrated with elliptic functions. For a generic response (Re(gamma) not=0), we display strong similarities with the cubic complex Ginzburg-Landau equation.Comment: 16 pages, J Phys A Fast track communication, to appear 200