218 research outputs found
INFORMATION-ANALYTICAL MONITORING SYSTEM OF PROFESSIONAL EDUCATION QUALITY
Article opens a series of publications devoted to creation of information-analytical system of monitoring of professional training quality which provides the solution of expert and analytical problems of an assessment of current state of quality of educational services, formation of recommendations about improvement of quality for administration of educational institution
Electronic states in heterostructures formed by ultranarrow layers
Low-energy electronic states in heterosrtuctures formed by ultranarrow layer
(single or several monolayers thickness) are studied theoretically. The host
material is described within the effective mass approximation and effect of
ultranarrow layers is taken into account within the framework of the transfer
matrix approach. Using the current conservation requirement and the inversion
symmetry of ultranarrow layer, the transfer matrix is written through two
phenomenological parameters. The binding energy of localized state, the
reflection (transmission) coefficient for the single ultranarrow layer case,
and the energy spectrum of superlattice are determined by these parameters.
Spectral dependency of absorption in superlattice due to photoexcitation of
electrons from localized states into minibands is strongly dependent on the
ultranarrow layers characteristics. Such a dependency can be used for
verification of the transfer matrix parameters.Comment: 7 pages, 7 figure
Unusual chemical bond and spectrum of beryllium dimer in ground state
This review outlines the main results which show the dual nature of the
chemical bond in diatomic beryllium molecule in the ground
state. It has been shown that the beryllium atoms are covalently bound at
low-lying vibrational energy levels ({\nu}=0-4), while at higher ones
({\nu}=5-11) they are bound by van der Waals forces near the right turning
points. High precision ab initio quantum calculations of Be resulted in the
development of the modified expanded Morse oscillator potential function which
contains all twelve vibrational energy levels [A.V. Mitin, Chem. Phys. Lett.
682, 30 (2017)]. The dual nature of chemical bond in Be is evidenced as a
sharp corner on the attractive branch of the ground state potential curve.
Moreover, it has been found that the Douglas-Kroll-Hess relativistic
corrections also show a sharp corner when presented in dependence on the
internuclear separation. The difference in energy between the extrapolated and
calculated multi-reference configuration interaction energies in dependence on
the internuclear separation also exhibits singular point in the same region.
The other problems of ab initio quantum calculations of the beryllium dimer are
also discussed. Calculated spectrum of vibrational-rotational bound states and
new metastable states of the beryllium dimer in the ground state important for
laser spectroscopy are presented. The vibration problem was solved for the
modified expanded Morse oscillator potential function and for the potential
function obtained with Slater-type orbitals [M. Lesiuk et al, Chem. Theory
Comput. 15, 2470 (2019)]. The theoretical upper and lower estimates of the
spectrum of vibrational-rotational bound states and the spectrum of
rotational-vibrational metastable states with complex-valued energy eigenvalues
and the scattering length in the beryllium dimer are presented
Magnetoresistance of a semiconducting magnetic wire with domain wall
We investigate theoretically the influence of the spin-orbit interaction of
Rashba type on the magnetoresistance of a semiconducting ferromagnetic
nanostructure with a laterally constrained domain wall. The domain wall is
assumed sharp (on the scale of the Fermi wave length of the charge carriers).
It is shown that the magnetoresistance in such a case can be considerably
large, which is in a qualitative agreement with recent experimental
observations. It is also shown that spin-orbit interaction may result in an
increase of the magnetoresistance. The role of localization corrections is also
briefly discussed.Comment: 5 pages, 2 figure
Aspects of psychosomatic disorders in highly qualified athletes
Objective: to observe general abundance of various psychosomatic disorders among highly qualified athletes. Materials and methods: the study involved 3 094 athletes of Russian national teams with age range from 18 to 77 years. Analysis of data collected during the extend medical examinations (EME) of the national Russian team athletes in 2014-2016 years was conducted. Results: research shows high frequency of psychosomatic disorders among athletes of Russian national teams - 28,1%. The most common conditions among diseases with psychosomatic mechanisms in athletes of Russian national teams were disorders of the musculoskeletal system, the gastrointestinal tract, and the nervous system. Gender and age specific differences were shown. Conclusions: both psychological and psycho-physiological factors play significant role in the formation of psychosomatic disorders in athletes. Apparently, in view of the importance of social status (success) and, consequently, the tendency to negate problems, we expect late medical resource utilization in this group of the population (only in the case of a long and severe somatic disorder)
The mathematical modeling of recombination current instabilities in long high-resistivity gallium arsenide structures under local light action
Revisiting the need for optimization of psychological interventions in the medical service system for elite athletes
Objective: revelation of disadaptation among Russian elite athletesof necessity to optimize psychological interventions among biomedical support system for elite athletes. All participants were athletes of several Russian national teams, among them cyclic sports, game sports, complex coordination sports, and combat sports. Materials and methods: data obtained from 1176 elite athletes during extended medical examinations (EME) within the period from 2015 to 2018 were studied. Results: research reveals the relationship between psychical adaptation and athletes’ gender, age, level of experience, and sport-related specifics. Conclusions: athletes of various Russian national teams (from juniors to elite) suffer from notable disadaptation. Thereupon the necessity of changes to the existing system of psychophysiological interventions within national teams (namely: development of preventive treatment programs and correction of disadaptation programs) verify its importance
Psychophysiological and psychological features of elite young volleyball players
Objective: to analyze the psychological and psychophysiological features of effective volleyball play. Materials and methods: the study involved 19 female athlets with average age of 17±1 years. The study was conducted during the pre-competition period. Personality traits, sport motivation, coping strategies, emotional burnout, skills of mental training and visualization, were assessed by adapted Russian-language versions of questionnaires «Freiburg multi-factor personal questionnaire (FPI)», «Sport motivation scale (SMS)», «The Sport Imagery Questionnaire (SIQ)», «Strategic Approach to Coping Scale (SACS)», «Maslach burnout inventory». The levels of chronic and acute stress were assessed by «Acute and chronic stress scale». Attentional set-shifting, concentration of attention were examined by the Munsterberg test and the «Entangled lines» test. The speed and stability of sensorimotor functioning were assessed by Simple Reaction Time test and Choice Reaction Time test. Stress load was simulated by the game-biofeedback approach to examine the effectiveness of self-regulation. The obtained data were compared with the assessment of athletes’ gaming efficiency. Results: Revealed significant connection between game effectiveness and the reduced level of stress: high speed, reaction stability, internal motivation, decreased neuroticity, depressiveness, aggressiveness, emotional lability, developed skills of self-regulation, visualization and ideomotor training are discussed. Conclusions: Revealed psychological and psychophysiological features might be considered as components of the young female volleyball players’ model psychophysiological state
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