Quantum Equivalence of Massive Antisymmetric Tensor Field Models in Curved Space

We study the effective actions for massive rank-2 and rank-3 antisymmetric tensor field models in curved space-time. These models are classically equivalent to massive vector field and massive scalar field with minimal coupling to gravity respectively. We prove that effective action for massive rank-2 antisymmetric tensor field is exactly equal to one for massive vector field and effective action for massive rank-3 antisymmetric tensor field is exactly equal to one for massive scalar field. Prove is based on an identity for mass-dependent zeta-functions associated with Laplacians acting on $p$-forms.Comment: 8 pages, REVTeX fil

An "in situ" study of study of quenched Ti-Al system samples during heating

The study of the Ti-Al system samples containing up to 10 wt.% Al water quenched from different temperatures in β-phase region, was carried out in situ during heating on X-ray diffractometer. XRD analysis of quenched samples showed the presence of α'-martensite only. After quenching the increase of Al content in alloys displayed the decrease of the lattice parameters «a» and «c» and the rise of «c/a» ratio, since the lattice parameter «c» dropped slightly in contrast with the lattice parameter «a». Furthermore, Thermo-XRD (T-XRD) analysis represented the anisotropy of the coefficient of thermal expansion (CTE). Besides, T-XRD analysis indicated, that «c/a» ratio of samples Ti-0.5 wt.% Al with the least amount of Al revealed the fall of «c/a» ratio and at the same time samples contained 7 and 8 wt.% Al remained practically the same during heating. Whereas, samples Ti-10 wt.% Al with the largest quantity of Al showed the rise of c/a ratio during heating. © 2019 IOP Publishing Ltd. All rights reserved

Arrangement of cooperation between labour market and regional vocational education system

© 2018, Emerald Publishing Limited. Purpose: Modern educational environment in the system of vocational education focuses on the requirements of labour market and those of employers to the content of graduates’ professional competencies. Thus, the purpose of this paper is to develop practical guidance on the arrangement of cooperation between labour market and regional vocational education system. Design/methodology/approach: Participative approach allowed considering the cooperation between labour market and regional system of vocational education as the process aimed at creating management tools for formation, use, development of human resources. The research involved 300 teachers, 400 students, 100 employers, who found out the effectiveness criteria for the cooperation between labour market and vocational education system. Findings: The findings reveal national models characteristics and universal tools for cooperation between vocational education institutions and enterprise. National models characteristics allow identifying the most advantageous cooperation tools; comparing suggested tools with the experience of others and thereby assessing their relevance and implementation risks. Research limitations/implications: The research results allow us to plan strategies for further studies of this problem, which are related to the development of models for cooperation between labour market and vocational education system. Practical implications: The identification of universal tools for cooperation between vocational education institutions and enterprise promotes the integration of national vocational education systems into national educational space. The materials of the paper can be useful for university leaders and professors; employees of centres for professional advancement and retraining in selecting and structuring the content of academic and teaching staff’s advanced training. Social implications: The revealed criteria contribute to vocational education programmes integration, connection between professional and educational standards, students’ professional identity. Originality/value: The effectiveness of the cooperation between labour market and vocational education system will be improved by studying national models and identifying the most advantageous cooperation tools (modular training, voluntary social/ecological year, educational resources integration, state and public management, clustering vocational education institutions and industry companies). This will allow comparing the suggested tools for collaboration between labour market and vocational education system with the experience of others and thereby assess their relevance and implementation risks. Improving the cooperation between labour market and vocational education system will be successful provided that universal tools for cooperation (socio-economic, educational, practical, innovative and technological) are identified, which promotes the integration of national vocational education systems into national educational space. The effectiveness of cooperation between labour market and vocational education system will increase on condition of criterion assessment (clustering, subjectivity, transdisciplinarity), promoting vocational education programmes integration, connection between professional and educational standards, students’ professional identity, students’ engagement in the development and implementation of research and production projects, stepped formation of professional competencies

Investigation of physical properties of tungsten-based single crystals using an ultrasonic method

Using an ultrasonic method, the measurement of longitudinal and transversal velocities v of ultrasonic waves in the major crystallographic directions of pure-tungsten single crystals and tungsten single crystals alloyed with Ta and Mo was performed. Single crystals with a [110] crystallographic orientation were prepared by plasma-arc melting. Crystal density was also measured. Crystal elastic constants Cij, anisotropy factors A, Young’s modulus E, shear modulus G and bulk modulus B for the given crystallographic directions, and the mean values of the longitudinal and transversal velocities of the ultrasound according to the Fochtu-Roisu-Chilly method, Young’s modulus, shear modulus, Poisson’s ratio and Debye temperature were calculated from the obtained data. The measurement of ultrasound rates was realized by means of a pulse apparatus with a frequency of 10 MHz to 30 MHz. It was found that the alloying of pure tungsten with the elements such as tantalum and molybdenum led to a decrease in the average magnitudes of v, Cij, and B over various crystallographic and polarization directions, as well as the magnitude of . The effects of the alloying elements on the elastic properties of tungsten crystals were identical. It may be concluded on the basis of the obtained results that the ultrasonic method can be used for the quality control of the purity of tungsten single crystals and tungsten low-alloyed alloys by measuring the attenuation effects of ultrasound waves in various parts of the tested samples.Web of Science48682682

Application of multivariate statistical analysis for delineation of prospective geochemical anomalies in Providenskaya Area (Chukotka, Russia)

The secondary geochemical field structure was modelled on the basis of the lithogeochemical dispersion trains of the Providenskaya Area of the Chukotka Peninsula. The factor and cluster analysis were applied to interpret the nature of geochemical anomalies. It was proved that a range of anomalies were prospective for gold-silver, polymetallic, tin, and tungsten deposit allocation

Structural and magnetic properties of the (001) and (111) surfaces of the half-metal NiMnSb

Using the full potential linearised augmented planewave method we study the electronic and magnetic properties of the (001) and (111) surfaces of the half-metallic Heusler alloy NiMnSb from first-principles. We take into account all possible surface terminations including relaxations of these surfaces. Special attention is paid to the spin-polarization at the Fermi level which governs the spin-injection from such a metal into a semiconductor. In general, these surfaces lose the half-metallic character of the bulk NiMnSb, but for the (111) surfaces this loss is more pronounced. Although structural optimization does not change these features qualitatively, specifically for the (111) surfaces relaxations can compensate much of the spin-polarization at the Fermi surface that has been lost upon formation of the surface.Comment: 18 pages, 8 figure

Special competence in the structure of vocational pedagogical integrity in the sphere of vocational education

The significance of the issue under study lies in research of the subject matter, character and components of special competences, as well as defining feasible ways of their formation in the framework of a higher vocational pedagogical institution. The article is aimed at providing the rationale for necessary formation of special competences in education for vocational teachers with implementation of Vocational and Federal State Education Standards. The main method of studying the given issue consists in pedagogical modeling of educational procedures for vocational teachers which allows it to outline the formation process of a special competence in learning specialist disciplines after determining its structure and contents. It was deemed necessary and proved to form special competence in education of future vocational teachers. The process of special training was structured with relevant amendments and supplements to its contents. On the top of it, this process of was accompanied by specially designed learning and teaching materials. The contents of the article could be of interest for graduate students and postgraduates as well as teachers who are involved in working on educational projects for vocational teachers. © Authors

Multimedia technologies in vocational education

Modern higher professional education is aimed at the formation of a highly qualified competent specialist. In the conditions of the competence approach, there is an active introduction in the educational process of multimedia technologies. This is one of the most rapidly developing areas of information technology. Therefore, the training of students should be carried out with the use of various information and communication tools, ensuring the improvement of the quality of education. The purpose of the article is to present the experience of training students of pedagogical University using multimedia technologies. The analysis of the impact of these technologies on the motivation and training of students when studying discipline "technology of training teachers of the past" (media technologies have been embedded in the discipline content). For the study, we measured the motivation of students. We compared the indicators of motivation diagnostics in 2017 (before the introduction of multimedia technologies) and 2018 (after the introduction of technologies). We compared the motives of creative realization (MTR) and professional motives (PM). According to the control event on the discipline "Technologies of teaching teachers of the past", we found that the percentage of "excellent" in 2018 has increased significantly, the percentage of unsatisfactory ratings have decreased. The obtained data allowed detecting positive changes after the introduction of multimedia technologies into the educational process. The motivation of students to study the discipline has increased, their preparedness has increased, and the quality of education has increased. The high efficiency of multimedia technologies was determined, so their implementation in the training of students of pedagogical University will continue