Application Of Rf (13.56 MHz) Arc Discharge For Plasma Chemical Conversion Of Volatile Fluorides

The report discusses the use of a new type of plasma source of hydrogen plasma based on a RF (13.56 MHz) arc discharge of atmospheric pressure between two electrodes. This discharge was used for hydrogen reduction of the tetrafluorides of silicon, boron and molybdenum. As a result of the studies, the main regularities of the hydrogen reduction process were established and the main synthesized products were determined. Samples of carbides of silicon, boron and molybdenum were prepared

Interfacial dynamics in transport-limited dissolution

Various model problems of ``transport-limited dissolution'' in two dimensions are analyzed using time-dependent conformal maps. For diffusion-limited dissolution (reverse Laplacian growth), several exact solutions are discussed for the smoothing of corrugated surfaces, including the continuous analogs of ``internal diffusion-limited aggregation'' and ``diffusion-limited erosion''. A class of non-Laplacian, transport-limited dissolution processes are also considered, which raise the general question of when and where a finite solid will disappear. In a case of dissolution by advection-diffusion, a tilted ellipse maintains its shape during collapse, as its center of mass drifts obliquely away from the background fluid flow, but other initial shapes have more complicated dynamics.Comment: 5 pages, 4 fig

Novel Regime of Operation for Superconducting Quantum Interference Filters

A new operating regime of the Superconducting Quantum Interference Filter (SQIF) is investigated. The voltage to magnetic field response function, V(H), is determined by a Fraunhofer dependence of the critical current and magnetic flux focusing effect in Josephson junctions (F-mode). For SQIF-arrays made of high-Tc superconducting bicrystal Josephson junctions the F-mode plays a predominant role in the voltage-field response V(H). The relatively large superconducting loops of the SQIF are used for inductive coupling to the external input circuit. It is shown that the output noise of a SQIF-array measured with a cooled amplifier in the 1-2 GHz range is determined by the slope of the V(H) characteristic. Power gain and saturation power were evaluated using low frequency SQIF parameters. Finally, we consider the influence of the spread in the parameters of Josephson junctions in the SQIF-array on the V(H) characteristic of the whole structure.Comment: 7 pages, 4 figure

Transformación del sistema legal en la era digital: planteamiento del problema

This paper discusses the prospects for the development of the legal system, the system of legislation and the judicial system of the Russian Federation in the context of the fourth industrial revolution associated primarily with the digitalization of all spheres of social life, all social institutions, including the law, of course. There is a range of problematic issues that will require their resolution in the near future. It is suggested that the process which can be described as "technologization of law" is inevitable. The possibility of revising the key institutions of law and actually forming new terminology is not ruled out.Este documento analiza las perspectivas para el desarrollo del sistema legal, el sistema legislativo y el sistema judicial de la Federación de Rusia en el contexto de la cuarta revolución industrial asociada principalmente con la digitalización de todas las esferas de la vida social, todas las instituciones sociales, incluidas la ley, por supuesto. Hay una variedad de problemas problemáticos que requerirán su resolución en un futuro cercano. Se sugiere que el proceso que puede describirse como "tecnologización de la ley" es inevitable. No se descarta la posibilidad de revisar las instituciones jurídicas clave y, de hecho, formar una nueva terminología

Dynamics of ice-rock barriers under conditions of freezing of filtering rocks

Nonstationary heat transport under conditions of freezing of filtering soils is studied using a mathematical model which takes into account an arbitrary distribution of sources of cold. © 1987 Plenum Publishing Corporation

Application of RF (13.56 MHz) Arc Discharge for Plasma Chemical Conversion of Volatile Chlorides of Silicon and Germanium.

The processes of hydrogen reduction of silicon and germanium chlorides are studied under RF conditions (40.68 MHz) of contracted atmospheric pressure arc discharge stabilized between two rod electrodes. The main gas-phase and solid products of plasma-chemical transformations are determined. Using the hydrogen reduction of SiCl4 as an example, the numerical simulation of gas-dynamic and heat exchange processes for this type of discharge was performed. The studies were carried out for the optimal conditions for obtaining trichlorosilane using modern computational technologies of fluid dynamics which made it possible to detail the velocity and temperature fields, the gas flow rates in the plasma region, and also determine the main temperature zones affecting the hydrogen reduction process

On guarantee optimization under conditions of integral constraints on control actions and nonterminal quality index

A linear-convex problem of dynamical guarantee optimization under conditions of unknown disturbances and with positional quality index that estimates a set of deviations of the motion of the controlled system at given instants of time from given target points is considered. Control actions are bounded by both geometrical and integral constraints. Disturbance actions are only geometrically bounded. A procedure for approximate computing of the optimal guaranteed result and of the corresponding optimal closed-loop control law is elaborated. The method is based on recurrent constructions of upper convex hulls of auxiliary program functions. Results of numerical experiments on model examples are given. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved