Toroidal equilibria in spherical coordinates

The standard Grad-Shafranov equation for axisymmetric toroidal plasma equilibrium is customary expressed in cylindrical coordinates with toroidal contours, and through which benchmark equilibria are solved. An alternative approach to cast the Grad-Shafranov equation in spherical coordinates is presented. This equation, in spherical coordinates, is examined for toroidal solutions to describe low $\beta$ Solovev and high $\beta$ plasma equilibria in terms of elementary functions

Inertial deposition of aerosol particles in a periodic row of porous cylinders

© 2015 American Association for Aerosol Research. The aerosol flow through a periodic row of parallel porous cylinders is investigated. The air flow field outside the cylinders is described by the Navier-Stokes equations of viscous incompressible fluid. The extended Darcy-Brinkman equations are used to calculate the flow velocity inside a porous cylinder. The dependence of the efficiency of the deposition of aerosol particles by inertial impaction and interception on the Stokes number for various values of the Darcy number is studied. Comparison of the results obtained from the numerical model and an approximate analytical model is given. The combined approximate formula for the deposition efficiency of a cylindrical fiber in a parallel array proposed by Müller et al. (2014) is extended for the porous cylindrical fiber. The aerosol flow through the porous body composed by a random array of cylinders is calculated to estimate the interior deposition

Plasma technology for increase of operating high pressure fuel pump diesel engines

This paper presents the results of a change in the service life of high pressure fuel pumps of diesel engines on the working surface of the plunger which a wear resistant dielectric plasma coatings based on silicon oxycarbonitride. Such coatings possess high wear resistance, chemical inertness and low friction

Assessing the Impact of RPA on the Modern Economic System

The study examines the iss ues of assessing the impact of the technology of robotization and automation of business processes on the modern economic system and on enterprises in the field of high information technologies. The hypothesis is put forward, according to which the introduction of RPA technologies can significantly reduce the costs of companies for the organization and implementation of manual labor by delegating such labor to the described technologies. The relevance of the research is due to the growing influence of RPA technologies on the business processes of companies, the structure of their costs and revenues, as well as the outstanding financial results of companies that have implemented business process automation technologies. The purpose of the study is to evaluate the effectiveness and expediency of the use of robotization of business processes by domestic companies. During the analytical activity, a strong relationship was revealed between the growth of the RPA technology market and the dynamics of the financial assessment of companies related to the field of business process automation. A sociological survey was also conducted, the purpose of which was to find out the level of popularity of RPA among people, their opinions about automation technologies, confidence in such services and the desire to use the technologies under study in their own lives. The research uses general scientific methods: analysis, synthesis, sociological survey, correlation analysis, as well as a systematic approach. As a result of the study, the hypothesis was confirmed, proving that modern companies should implement RPA technologies in order to withstand competition by reducing costs. The sociological survey showed that the vast majority of respondents are familiar with RPA technologies and trust them to a certain extent. A large percentage of respondents stated their readiness to use automation, which gives companies access to new horizons of opportunities due to the likely increase in people’s confidence in automation tools. Recommendations were given to domestic companies on the introduction of robotics into the business structure and the prospects for improving labor productivity at all levels of the company were described. The above measures may also be the result of changes in the company’s recruitment policy and the system of training and introduction of new personnel

Numerical simulation of heat and mass transfer processes in large-scale fluidized bed complex structure apparatus as an example of the reactor of isoparaffins dehydrogenation

In the chemical industry are widely used fluidized bed apparatus. The advantage of them is the high speed of heat and mass transfer between components of the reaction, which are in different aggregation states. Studies of large-scale apparatus are hindered big sizes and plurality of structural elements. Often such apparatus operate at high temperatures (500-900 C), which further complicates the study. In this paper we consider a fluidized bed reactor block intended for the dehydrogenation of isobutane. In numerical simulation of fluidization was extended Eulerian-Eulerian approach. Differential equations that describe the hydrodynamic and thermal processes in the field of computational model of the reactor were solved in ANSYS Fluent CFD for axisymmetric unsteady flow scheme. At full simulation of the unit of the reactor in differential equations for the mass fraction of components of the gas mixture is necessary to consider changes related with chemical reactions. In the model used for this purpose it is necessary to add terms to the equations of mass transfer and absorption of heat depending primarily on the gas temperature and catalyst concentration. In this paper we'll restrict considering the minimum number of components of the reaction (raw materials - isobutane, product - isobutylene). For a given chemical reaction is written User Defined Functions (UDF). The influence of the ambient gas, the catalyst and the time step on the progress of chemical reaction in the volume element is studied. Numerical calculations were carried out, due to them circulating streams in the apparatus, the temperature field distribution of the catalyst and the conversion of the feeding gas-raw were analyzed

Electrophoretic deposition of YSZ layers on pyrolytic graphite and a porous anode substrate based on NiO-YSZ

Solid oxide fuel cells are promising hydrogen energy devices. The goal of this research was to create ceramic layers for SOFCs based on yttria-stabilized zirconia (YSZ) and to investigate their parameters. YSZ ceramic layers with a thickness of 5.14 μm on a porous NiO–YSZ substrate and 7 μm on pyrolytic graphite were obtained by electrophoretic deposition. X-ray diffraction and electron microscopy were used to determine the composition, structure, and morphological features of ceramic layers. The effects of the substrate's nature, the degree of dispersion of the initial YSZ powder, and the heat treatment conditions on the properties of the ceramic layer YSZ were considered

Formation of healthy saving competence of students of high schools in the context of their cross-cultural formation

Рассматриваются организационные и содержательные аспекты формирования здоровьесберегающей компетентности студентов вузов в контексте их общекультурного становленияThe article considers the organizational and content aspects of the formation of health-saving competence of university students in the context of their general cultural developmen

Surface hardening of cutting elements agricultural machinery vibro arc plasma

At present, the state technical policy aimed at the modernization of worn equipment, including agriculture, based on the use of high-performance technology called nanotechnology. By upgrading worn-out equipment meant restoring it with the achievement of the above parameters passport. The existing traditional technologies are not suitable for the repair of worn-out equipment modernization. This is especially true of imported equipment. Out here alone - is the use of high-performance technologies. In this paper, we consider the use of vibro arc plasma for surface hardening of cutting elements of agricultural machinery