Study of spatial-time inhomogeneity of serrated plastic flow Al-Mg alloy: using DIC-technique

The aim of the present paper is the investigation of temporal instabilities and spatial localizationdue to the Lüders behavior, the Portevin–Le Chatelier effect and the shoulder or necking effect during uniaxialtension tests of aluminum-magnesium alloy. This paper presents the brief description of the test procedure andexperimental results of carrying out research by the combined use of a servo-hydraulic biaxial test systemInstron 8850 and a non-contact 3-D digital image correlation measurement system Vic-3D. The digital imagecorrelation is a highly effective computer-vision-based technique, which provides estimation of thedisplacement and strain fields on specimen surface by matching the reference subsets in the undeformed image(before loading) with the target subsets in the deformed images (captured during test). The evolution ofinhomogeneous axial strain and axial strain rate fields has been illustrated for each stage of material’sdeformation. To estimate the kinematics of serrated or jerky flow due to the strain bands propagation, the strainversus time curves and strain diagrams are given here. The experimental results show the recurrence in thestrain distribution leveling along the specimen gauge. The changing between the macroscopic localization of theplastic flow, namely the running of the Lüders and PLC bands and the recovery of strain field homogeneity, hasbeen observed

Two-particle multiplets splitting as a guideline in nucleon pairing estimations

The ground state multiplet structure for nuclei over the wide range of mass number $A$ was calculated in $\delta$-approximation and different mass relations for pairing energy was analysed in this work. Correlation between the calculated multiplet structure and experimental data offer a guideline in deciding between mass relations for nucleon pairing.Comment: 6 pages, 2 fig., Proceedings of Intern. Session-Conference of the Section of Nuclear Physics of PSD RAS (April 12 - 15, 2016, JINR Dubna), to be published in Journal Physics of Elementary Particles and Atomic Nuclei (PEPAN

Vocational training in sport and recreation micro-enterprises as an education project

This study appears urgent due to the need to create new jobs in the sport and recreation sector and to update the existing approach to vocational training in a micro-enterprise. This paper proposes an education project as a form of vocational training in such conditions. The authors aim to comprehend the current issues of pedagogical design for the transfer of experience within a micro-enterprise of the sport and recreation sector and to determine the conditions for effective educational interaction of micro-enterprise employees. This problem is addressed with a combination of the systematic approach and activity-based learning. This makes it possible to present the process of pedagogical design of vocational training in the conditions of a micro-enterprise as systematic activity of individuals in developing the professional competencies of a sport and recreation worker. The authors used theoretical and empirical methods. The theoretical methods were analysis of the psychological, pedagogical, sociological, scientific-methodological and specialized literature on the studied problem; the systematic approach to the definition of the problem and the formation of the research terminology; and analysis of the legal acts. The empirical methods were pedagogical observation; study and generalization of pedagogical experience; pedagogical design; questioning; conversation; interview; performance analysis; and expert evaluation method and integration of expert opinions. © 2018 Authors