Released momentum distribution of a Fermi gas in the BCS-BEC crossover

We develop a time-dependent mean-field theory to investigate the released momentum distribution and the released energy of an ultracold Fermi gas in the BCS-BEC crossover after the scattering length has been set to zero by a fast magnetic-field ramp. For a homogeneous gas we analyze the non-equilibrium dynamics of the system as a function of the interaction strength and of the ramp speed. For a trapped gas the theoretical predictions are compared with experimental results.Comment: 4 pages, 4 figure

Spatial chaos of an extensible conducting rod in a uniform magnetic field

The equilibrium equations for the isotropic Kirchhoff rod are known to form an integrable system. It is also known that the effects of extensibility and shearability of the rod do not break the integrable structure. Nor, as we have shown in a previous paper does the effect of a magnetic field on a conducting rod. Here we show, by means of Mel'nikov analysis, that, remarkably, the combined effects do destroy integrability; that is, the governing equations for an extensible current-carrying rod in a uniform magnetic field are nonintegrable. This result has implications for possible configurations of electrodynamic space tethers and may be relevant for electromechanical devices

Assessment of Parameters of Regional Education Systems as Instrument of Managerial Decisions Development

The authors propose an approach for developing an interrelated management consulting aimed at improving regional education systems. The proposed approach is based on the analysis of the calculated statistical indicators of preschool education

Chirality transfer and stereo-selectivity of imprinted cholesteric networks

Imprinting of cholesteric textures in a polymer network is a method of preserving a macroscopically chiral phase in a system with no molecular chirality. By modifying the elastics properties of the network, the resulting stored helical twist can be manipulated within a wide range since the imprinting efficiency depends on the balance between the elastics constants and twisting power at network formation. One spectacular property of phase chirality imprinting is the created ability of the network to adsorb preferentially one stereo-component from a racemic mixture. In this paper we explore this property of chirality transfer from a macroscopic to the molecular scale. In particular, we focus on the competition between the phase chirality and the local nematic order. We demonstrate that it is possible to control the subsequent release of chiral solvent component from the imprinting network and the reversibility of the stereo-selective swelling by racemic solvents

Effect of pulsed magnetic field pre-treatment of AISI 52100 steel on the coefficient of sliding friction and wear in pin-on-disk tests

Disc specimens manufactured from commercial bearing rollers (AISI 52100 steel, 62–63 HRC) in initial state and after pre-treatment by pulsed magnetic field (PMF) with a magnetic field strength of 1–7 MA/m were tested with sunflower oil using pin-on-disk apparatus. According to the obtained results the treatment causes a reduction in the coefficient of friction and wear. To explain the results, nano- and microhardness tests as well as optical and atomic force microscopy were used. Reasons of the effect of PMF on the friction and wear were discussed.Peer reviewe

Comparative analysis of the legal status of testamentary foundations in Russia and foreign countries

Legal rules on a testamentary foundation are a novelty for Russian legislation. Since there were no analogues of this legal institution in Russia before, many law enforcement problems arise. Russian testamentary foundations have largely adopted the provisions on the foundations of the continental legal system. For a better understanding of the legal nature of this subject of law and solving law enforcement problems, it is necessary to analyze the legal status of testamentary foundations in the states where they have existed for a long time, and take into account the positive foreign experienc

Structural Changes and the Paradigm Transformation of the Government Policy on Lifelong Professional Education

В настоящей концептуальной статье на основе анализа статистических данных об изменении средне-и долгосрочных потребностей и объемов подготовки кадров в различных подсистемах системы непрерывного профессионального образования рассматриваются гипотезы о вероятном развитии системы непрерывного профессионального образования России и концептуальные предложения по обусловленной этими изменениями приоритетов государственной политике в сфере непрерывного профессионального образования. Комплексный анализ тенденций структурных изменений системы непрерывного профессионального образования отечественными исследователями не проводился; данные зарубежной статистики [1] показывают, что аналогичные тенденции проявились в развитых странах раньше, чем в России. Причина написания статьи - привлечение внимания руководителей профессиональных образовательных организаций и органов управления профессиональным образованием к проблеме реструктуризации стратегических целей развития образования; идентификация проблемной области, актуальной для разработки стратегий развития вузов и сферы профессионального образования. Цели статьи достигаются с помощью анализа макроэкономических показателей потребностей в подготовке кадров по профессиональным образовательным программам разного уровня; сопоставления выявленных тенденций с аналогичными тенденциями за рубежом. Результаты проведенного исследования показали, что потребность в подготовке кадров в системе дополнительного профессионального образования значительно превышает потребности подготовки кадров по традиционным образовательным программам профессионального обучения, подготовки специалистов среднего звена и высшего образования. Причиной этого является ускорение технического и технологического прогресса и объективная неспособность традиционных образовательных программ обеспечить оперативное получение специалистами компетенций, соответствующих быстро возникающим потребностям. Следствием этого является необходимость пересмотра на уровне государства и работодателей приоритетов в развитии профессионального образования и механизмов его стимулирования. Ограничениями в этом может быть недостаточно институционализированная система взаимодействия органов управления образованием, работодателей и образовательных организаций.This conceptual article is based on the statistical data analysis of the changes in mid- and long-term needs and in the scope of personnel training within various systems of lifelong professional education. These data are used to hypothesize the potential direction of the development of this educational system in Russia and the conceptual priorities of the state policies in the area of professional education. The trends related to structural changes in lifelong professional education have never been systematically analyzed in Russia. Foreign statistics shows that such trends have first appeared in other developed countries. Therefore, the purpose of this article is to draw government officials’ and heads of professional educational institutions’ attention to the importance of restructuring the strategic goals of the educational system development, to identify the problem domain of working out the strategies for educational institutions and for the development of the professional education sphere. This purpose is achieved through the analysis of the macroeconomic parameters showing the need in personnel trained within professional educational programmes of various levels and through comparing the identified trends to those in other countries. The results show that the need for training personnel through the system of vocational professional education is much higher than that for training within traditional programmes of professional and higher education. The reason is the intensification of the technological progress and the objective incapability of the traditional educational programmes to provide specialists with competences required by the rapidly changing demands. As a result, the government and employers have to reconsider the priorities of professional education development and the ways to stimulate it. Still, there can be some limitations driven by weakly institutionalized system of interaction within the education management system, among employers and educational institutions

Dzyaloshinskii--Moriya interaction: How to measure its sign in weak ferromagnetics?

Three experimental techniques sensitive to the sign of the Dzyaloshinskii--Moriya interaction are discussed: neutron diffraction, Moessbauer gamma-ray diffraction, and resonant x-ray scattering. Classical examples of hematite (alpha-Fe2O3) and MnCO3 crystals are considered in detailComment: 5 pages, 1 figure; to be published in JETP Letter