Variability Profiles of Millisecond X-Ray Pulsars: Results of Pseudo-Newtonian 3D MHD Simulations

We model the variability profiles of millisecond period X-ray pulsars. We performed three-dimensional magnetohydrodynamic simulations of disk accretion to millisecond period neutron stars with a misaligned magnetic dipole moment, using the pseudo-Newtonian Paczynski-Wiita potential to model general relativistic effects. We found that the shapes of the resulting funnel streams of accreting matter and the hot spots on the surface of the star are quite similar to those for more slowly rotating stars obtained from earlier simulations using the Newtonian potential. The funnel streams and hot spots rotate approximately with the same angular velocity as the star. The spots are bow-shaped (bar-shaped) for small (large) misalignment angles. We found that the matter falling on the star has a higher Mach number when we use the Paczynski-Wiita potential than in the Newtonian case. Having obtained the surface distribution of the emitted flux, we calculated the variability curves of the star, taking into account general relativistic, Doppler and light-travel-time effects. We found that general relativistic effects decrease the pulse fraction (flatten the light curve), while Doppler and light-travel-time effects increase it and distort the light curve. We also found that the light curves from our hot spots are reproduced reasonably well by spots with a gaussian flux distribution centered at the magnetic poles. We also calculated the observed image of the star in a few cases, and saw that for certain orientations, both the antipodal hot spots are simultaneously visible, as noted by earlier authors.Comment: 9 pages, 10 figures, accepted for publication in ApJ; corrected some typo

Somatic status of adolescent girls with gynecological disorders born with low and excessive weight

In modern conditions, health problems (somatic, reproductive, mental) of adolescent girls occupy a special place in the health care system, as a reserve in reducing maternal and infant mortality, maintaining the fertility of the expectant mother. The aim. To study the frequency and character of extragenital diseases of adolescent girls with gynecological pathology, born with low and excessive body weight. Materials and methods. The project design is a population-based prospective cohort study. To achieve the goal and the implementation of the tasks, a prospective examination of girls and adolescent girls born with deficiency or excess body weight was carried out. The sample size was 77 people. Additionally, statistical processing was carried out using the Excell software. Results. Thus, the study of somatic health indicates its deterioration in the groups of girls born with polar values ​​of body weight. In groups 1 and 3, infectious diseases were identified, which can serve as a starting point in the development of reproductive system disorders. In girls of group 1, mumps prevailed (20.0%), which could cause damage to the follicular apparatus, while in group 3, girls were more likely to have influenza (25.8%), the virus of which has a damaging effect not only on the structure of the ovaries, but also on endometrium. Conclusions. Comparative analysis of the structure of somatic morbidity made it possible to identify the most significant pathology characteristic of each of the groups. Girls born with a large body weight have an increased risk of endocrine pathology. In girls born with low body weight, somatic diseases associated with manifestations of diseases of the musculoskeletal system prevail. This dictates the need to single out girls born with polar values ​​of body weight in the risk group for the development of somatic pathology and requires complex therapeutic and prophylactic measures

Conductivity, weak ferromagnetism and charge instability in α−MnS\alpha-MnS single crystal

The temperature dependence of resistivity, magnetization and electron-spin resonance of the $\alpha- MnS$ single crystal were measured in temperature range of $5 K < T < 550 K$. Magnetization hysteresis in applied magnetic field up to 0.7 T at $T=5 K, 77 K, 300 K$, irreversible temperature behavior of magnetization and resistivity were found . The obtained data were explained in terms of degenerate tight binding model using random phase approximation. The contribution of holes in $t_{2g}$ and $e_g$ bands of manganese ions to the conductivity, optical absorbtion spectra and charge instability in $\alpha -MnS$ were studied. Charge susceptibility maxima resulted from the competition of the on-site Coulomb interaction between the holes in different orbitals and small hybridization of sub-bands were calculated at $T=160 K, 250 K, 475 K$.Comment: 6 pages, 12 figure

The component composition of integrated foreign language competence of future specialists of State Fire Service of the Emergency Ministry of Russia

The authors of the article consider one of the areas of modern vocational education as the formation of integrated foreign language communicative competence of future specialists. It is analyzed the reasons of integration lack of professional and foreign language background in the foreign language qualification in high school. They actualize the education content as a process of integration of vocational and language experience in the field of activity of the future specialist.Рассматривается одна из проблемных областей современного профессионального образования – формирование интегрированной иноязычной коммуникативной компетентности будущих специалистов. Анализируются причины отсутствия единства освоения профессионального и языкового опыта в иноязычной подготовке вуза. Актуализируются вопросы содержания образования как процесс интеграции профессионального и языкового опыта в сфере деятельности будущего специалиста

Эффективность работы светоизлучающих структур

Розглянуто декілька конструкцій різних світлодіодів: на сапфірової підкладці та на карбіді кремнію. Виведені їх покращені характеристики. В результаті для першого кристала була отримана розсіяна потужність 0,16 Вт, а для другого кристала – 1,12 Вт. Продемонстровано розрахунок теплового режиму за допомогою методу теплових опорів, який може використовуватися для оцінки надійності світлодіодів і поліпшення їх характеристик застосуванням спеціальних технологій відведення тепла від кристала за допомогою спеціальної технології монтажу та управління робочим струмом.Some designs of various LEDs are considered: on a sapphire lining and on silicon carbide lining. Deduced their best characteristics. As the result, received the data on the first crystal – scattering power 0,16 W, and on the other, power was 1,12 W. Calculations of a thermal mode by means of a method of thermal resistance are shown, which can be used to assess and improve performance LED that is designed, by increasing the heat removal from the crystal by using special technology installation and managing operating current.Рассмотрено несколько конструкций различных светодиодов: на сапфировой подкладке и на карбиде кремния. Выведенные их лучшие характеристики. В результате для первого кристалла была получена рассеянная мощность 0,16 Вт, а для второго кристалла – 1,12 Вт. Продемонстрирован расчет теплового режима с помощью метода тепловых сопротивлений, который может использоваться для оценки надежности светодиодов и улучшения их характеристик за счет применения специальных технологий отвода тепла от кристалла с помощью специальной технологии монтажа и управления рабочим током

Particle Acceleration and Magnetic Dissipation in Relativistic Current Sheet of Pair Plasmas

We study linear and nonlinear development of relativistic and ultrarelativistic current sheets of pair plasmas with antiparallel magnetic fields. Two types of two-dimensional problems are investigated by particle-in-cell simulations. First, we present the development of relativistic magnetic reconnection, whose outflow speed is an order of the light speed c. It is demonstrated that particles are strongly accelerated in and around the reconnection region, and that most of magnetic energy is converted into "nonthermal" part of plasma kinetic energy. Second, we present another two-dimensional problem of a current sheet in a cross-field plane. In this case, the relativistic drift kink instability (RDKI) occurs. Particle acceleration also takes place, but the RDKI fast dissipates the magnetic energy into plasma heat. We discuss the mechanism of particle acceleration and the theory of the RDKI in detail. It is important that properties of these two processes are similar in the relativistic regime of T > mc^2, as long as we consider the kinetics. Comparison of the two processes indicates that magnetic dissipation by the RDKI is more favorable process in the relativistic current sheet. Therefore the striped pulsar wind scenario should be reconsidered by the RDKI.Comment: To appear in ApJ vol. 670; 60 pages, 27 figures; References and typos are fixe

Hydrodynamic Simulations of Counterrotating Accretion Disks

Hydrodynamic simulations have been used to study accretion disks consisting of counterrotating components with an intervening shear layer(s). Configurations of this type can arise from the accretion of newly supplied counterrotating matter onto an existing corotating disk. The grid-dependent numerical viscosity of our hydro code is used to simulate the influence of a turbulent viscosity of the disk. Firstly, we consider the case where the gas well above the disk midplane rotates with angular rate +\Omega(r) and that well below has the same properties but rotates with rate -\Omega(r). We find that there is angular momentum annihilation in a narrow equatorial boundary layer in which matter accretes supersonically with a velocity which approaches the free-fall velocity and the average accretion speed of the disk can be enormously larger than that for a conventional \alpha-disk rotating in one direction. Secondly, we consider the case of a corotating accretion disk for rr_t. In this case we observed, that matter from the annihilation layer lost its stability and propagated inward pushing matter of inner regions of the disk to accrete. Thirdly, we investigated the case where counterrotating matter inflowing from large radial distances encounters an existing corotating disk. Friction between the inflowing matter and the existing disk is found to lead to fast boundary layer accretion along the disk surfaces and to enhanced accretion in the main disk. These models are pertinent to the formation of counterrotating disks in galaxies and possibly in Active Galactic Nuclei and in X-ray pulsars in binary systems.Comment: LaTeX, 18 pages, to appear in Ap

Physical Activity and Gallstone Disease

Аim: to present data of Russian and foreign studies about association between physical activity (PA) and gallstone disease (GSD).Key point. A low PA level is one of the four major risk factors for chronic non-infectiuos diseases. The frequency of low PA in men and women of the Russian Federation (according to the medical examination in 2016) is 19 %. The global prevalence of GSD is up to 20 % among adults. Many systematic reviews and meta-analyses have confirmed an inverse association between GSD and PA in the world, regardless of potential risk factors for GSD, with a clear dose-dependent effect — the relative risk (RR) of GSD was 0.87 (95 % CI 0.83–0.92) per 20 metabolic equivalents (MET) of PA per week. According to our results of an epidemiological survey in the framework of the WHO MONICA program in Novosibirsk (n = 870) among women aged 25–64 with low total PA (less than 800 MET/min/week), as well as with the first class of PA in leisure-time, GSD occurred much more often (class 1 — 33 %, classes 2–4 — 8.7–11.0 %, p &lt; 0.01). PA favorably affects almost all mechanisms of gallstone formation: improves cholesterol metabolism in bile, increases serum HDL cholesterol, bile acid synthesis, stimulates the release of cholecystokinin, reduces mucin hypersecretion, increases the diversity and richness of the intestinal microbiota. Daily PA serves as a preventive measure for GSD: the risk of GSD is reduced by 66 % (95 % CI 0.18–0.86).Conclusion. EASL has recognized PA as a protective agent against gallstone formation

CONFLICTS՚ SOURCES AND STRESSFUL FACTORS IN MODERN ORGANIZATIONS

The article gives the results of a study of managers and ordinary employees of Russian organizations on the problem of identifying sources of conflicts and stress factors affecting the functioning of companies. The paper analyses in detail and presents the answers of respondents to the questionnaire about the frequency of the confrontation; on the impact of collisions on staff productivity and on the development of unfavorable mental states of workers; on the role of management and ordinary employees in the emergence of conflicts; about the main reasons for the conflict confrontation; on the system of conflict and stress management, including measures to prevent and resolve them. The results of the survey showed that both the company’s management and ordinary personnel are involved in conflicts, and the leading source of confrontation, according to the majority of respondents, is the individual psychological characteristics of employees. At the same time, the conflicts themselves act as stress factors, having a direct adverse effect on the efficiency of activities and causing specific unwanted emotional reactions. Among other things, the results of the survey showed that the organizations where the respondents work do not have a well-functioning system of conflict management. The research results are practice-oriented

SOCIAL DEVELOPMENT OF PERSONNEL IN THE CONDITIONS OF INNOVATIVE ECONOMY AS A FACTOR OF INCREASING THE LEVEL OF LIFE QUALITY

The importance of the social development of personnel in innovative economy as a decisive factor in the stability of society and improving the quality of life of both workers themselves and the entire population of the country has been defined. It has been shown that social development of staff in the organization contributes to the improvement of social and labor relations through interaction of the parties of social partnership based on the principle of tripartite cooperation and “tripartism”, and also contributes to the full development of the potential of employees and their professional competences. The main directions of social development of personnel included in the social policy of the organization have been determined in the paper. As a result of the research, priority role of cash payments and guarantees in the organization’s social responsibility strategy have been identified. At the same time, the main principle in the development of policy aimed at social development of staff should be targeted consideration of the needs of employees. The principle of targeting to determine the level of staff satisfaction should be the main one for evaluating the effectiveness of work in this direction. In addition, the authors point to the need to use modeling and forecasting the prospects of social innovations in order to achieve sustainable development in the long term