Speeding Strings

There is a class of single trace operators in ${\cal N}=4$ Yang-Mills theory which are related by the AdS/CFT correspondence to classical string solutions. Interesting examples of such solutions corresponding to periodic trajectories of the Neumann system were studied recently. In our paper we study a generalization of these solutions. We consider strings moving with large velocities. We show that the worldsheet of the fast moving string can be considered as a perturbation of the degenerate worldsheet, with the small parameter being the relativistic factor $\sqrt{1-v^2}$. The series expansion in this relativistic factor should correspond to the perturbative expansion in the dual Yang-Mills theory. The operators minimizing the anomalous dimension in the sector with given charges correspond to periodic trajectories in the mechanical system which is closely related to the product of two Neumann systems.Comment: v3: added a reference to the earlier wor

Phase transitions and phase diagram of the ferroelectric perovskite NBT-BT by anelastic and dielectric measurements

The complex elastic compliance and dielectric susceptibility of (Na_{0.5}Bi_{0.5})_{1-x}Ba_{x}TiO_{3} (NBT-BT) have been measured in the composition range between pure NBT and the morphotropic phase boundary included, 0 <= x <= 0.08. The compliance of NBT presents sharp peaks at the rhombohedral/tetragonal and tetragonal/cubic transitions, allowing the determination of the tetragonal region of the phase diagram, up to now impossible due to the strong lattice disorder and small distortions and polarizations involved. In spite of ample evidence of disorder and structural heterogeneity, the R-T transition remains sharp up to x = 0.06, whereas the T-C transition merges into the diffuse and relaxor-like transition associated with broad maxima of the dielectric and elastic susceptibilities. An attempt is made at relating the different features in the anelastic and dielectric curves to different modes of octahedral rotations and polar cation shifts. The possibility is also considered that the cation displacements locally have monoclinic symmetry, as for PZT near the morphotropic phase boundary.Comment: 11 pages, 9 figures, submitted to Phys. Rev.

Entrepreneurship in national economics: significance and potential of development

The purpose of the study was to develop proposals for the use of two comprehensive indexes to assess the social significance and the existing potential for entrepreneurship development in different countries. The study used information provided in the report on the Global entrepreneurship monitoring project. At the same time, the opinions of residents of 48 countries for 2018 were considered. The first index included four indicators, and the second index included five indicators. Mathematical models were developed and the values of these two complex indexes were calculated. The average values of the indexes and their ranges of change for most countries are determined. Lists of countries with high and low index values are given. A comparative analysis of the values of complex indexes typical for Russia and other countries is presented. The results of research are new and original, have scientific and practical significance

On stress/strain state in a rotating disk

In the framework of mechanics of continuum bodies, the problem of stress/strain state in a high-speed rotating disk of constant thickness has been considered. The material of the disk is assumed to be homogeneous, elastic/perfectly-plastic. In the plastic zone, the stresses and plastic strains are related by some associated law similar to the one employed in deformation theory of plasticity. The general algorithm of the solution covers any smooth plasticity function. At some steps of the algorithm, it is possible to get analytical expressions, particularly, for the quadratic Mises yield criterion. For the given model, the notion of control parameters (external and internal) has been introduced. The allowable boundaries of external parameters have been defined as well. For some states of the disk, the coherent values of external parameters have been obtained. The results are represented graphically to show various states of the disk. The usage of piecewise plasticity functions has been briefly discussed. The results obtained can be used in preliminary engineering design and related numerical codes.info:eu-repo/semantics/publishedVersio

Cerebroprotective activity of 3-benzylxanthine derivative – compound Ale-15, in conditions of bilateral common carotid arteries ligation (ischemic stroke)

Background: Acute ischemic stroke is a leading cause of mortality, morbidity, long-term disability in industrialized countries. One of main parts of it pathogenesis is production of reactive oxygen species. The accumulation of them in neurons results in lipid peroxidation, protein oxidation, DNA damage, and finally cell death. Thereby the search of novel drugs, that have antioxidant action and can be used to complex treatment of cerebral strokes is reasonable. It is known, that xanthine derivatives exhibit a broad spectrum of biological activity, including antioxidant. So that, the goal of this research was to study in vivo neuroprotective action of water-soluble derivative of 3-benzylxanthine – morpholin-4-ium 3-benzylxanthinyl-8-methylthioacetate (Ale-15 compound) in comparison with neuroprotector-antioxidant – Mexidol.Methods: Experimental part was done on white Wistar rats of both sexes of 220-260 g weight. For assessment of neuroprotective action of compound we used a model of global incomplete cerebral ischemia, that was reproduced by bilateral common carotid arteries ligation.Results: It was studied an acute toxicity of Ale-15 compound, it influence on survival of laboratory animals, on progression of neuralgic deficit, on the content of adenylic nucleotides, on criteria of energy metabolism, on the activity of antioxidant enzymes and on oxidative modification of protein. Results of study showed, that injection of Ale-15 compound to animals with ischemic stroke intragastrically during 4 days positively reduced death rate and quantity of animals with serious neurologic symptoms. The main parts of Ale-15 cerebroprotective mechanism are antioxidant and anti-ischemic actions.Conclusions: The performed study revealed significant cerebroprotective features of Ale-15 compound in conditions of experimental cerebrovascular accident

Рабочая смена: восполнит ли молодежь кадровый дефицит в промышленности и аграрно-промышленном комплексе?

Дефицит квалифицированных рабочих кадров остается острой проблемой со времен кризиса 2008—2009 гг. В статье обсуждаются результаты двух социологических исследований, проведенных в регионах России с отчетливой отраслевой специализацией и предусматривавших анкетный опрос учащихся учреждений профтехобразования, а также экспертные интервью с руководством предприятий, отраслевых ассоциаций, торгово-промышленных палат и руко-водителями учреждений профтехобразования. Собранный материал дает информацию о том, какой контингент и почему приходит учиться рабочим профессиям; каким видит молодежь свое трудоустройство по окончании обучения; почему предприятиям по-прежнему сложно восполнять кадровый дефицит; появилась ли у бизнеса возможность долгосрочно планировать свои кадровые потребности, а у системы профтехобразования — эффективно на них отвечать. Показано, что выбор рабочей профессии определяется надеждой на достойно оплачиваемую работу, возможностью в короткий срок получить профессию и легкостью поступления в образовательное учреждение. Больше половины учащихся согласны практически со всеми позитивными утверждениями относительно рабочих профессий, но в то же время две трети понимают, что они связаны с тяжелыми либо опасными условиями труда. Хотя по окончании производственной практики большинство респондентов убедились в верности выбора профессии, в цеха и на поля идут далеко не все, что связано с невысокой зарплатой молодых кадров и/ или местом локализации предприятия при наличии альтернативы в виде работы в торговле или сервисе. Короткий горизонт планирования и низкий уровень рентабельности не позволяют предприятиям просчитывать свои кадровые потребности и формировать кадровый резерв, что дезориентирует систему профобразования и консервирует дисбалансы на рынке труда. Улучшению ситуации, по мнению как молодежи, так и экспертов, способствовало бы проведение государством более последовательной и эффективной политики поддержки промышленности и аграрно-промышленном ком-плексе (АПК)

Joint Patenting as a Partnership Tool of Universities and Companies

В статье определены проблемы и вопросы в сфере управления интеллектуальной собственностью университетов и предприятий. Рассмотрены правовые положения совместного владения интеллектуальной собственностью университета и предприятия, и в частности совместного патентования. Определены модели закрепления прав в системе «вуз - предприятие» и предложен механизм совместного патентования как инструмент партнерства университета и предприятия.The article identifies problems and issues in the field of intellectual property management of universities and companies. The legal provisions of joint ownership of intellectual property and, in particular, joint patenting are considered. The models of securing rights in the “university-company” system are defined and the mechanism of joint patenting as a tool of partnership between the university and the enterprise is proposed

RESEARCH OF ROLE MODELS OF INTERACTION BETWEEN A UNIVERSITY AND AN INDUSTRIAL PARTNER IN THE FIELD OF INTELLECTUAL PROPERTY

The article systematizes the existing role models of interaction between the university and the industrial partner in the field of intellectual property, as well as the corresponding schemes of division and consolidation of intellectual rights