The pyramids method application for the synthesis of a parallel algorithm solving finite differential equations scheme Yee. One-dimensional case

In this paper, we propose a modification of the method of the pyramids to build parallel algorithms for explicit difference equations. Its efficiency is shown on a practical example of the differential solution of the one-dimensional equations of the Maxwell in two tasks efficiency. In comparison with a usual parallel algorithm acceleration of calculations is increased by 1.6 times. We investigated the efficiency of the author's approach depending on the height of the pyramid, indicated the limits of applicability of the proposed changes.The research leading to these results has received funding from the Russian Science Foundation grant №16-47-630560-r_a

Block algorithms to solve Zheng/Chen/Zhang's finite-difference equations

Работа посвящена синтезу блочных алгоритмов FDTD-метода для расчетов по неявной разностной схеме Zheng/Chen/Zhang. Существенное внимание уделяется экспериментальному исследованию построенных алгоритмов, выявлению особенностей организации блочных вычислений по неявным сеточным уравнениям. Эффективность предложенных подходов подтверждена шестикратным ускорением вычислений. This paper is devoted to the design of multiblock algorithms of the FDTD-method intended for computations based on a Zheng-Chen-Zhang implicit finite-difference scheme. Special emphasis is placed on experimental research of the designed algorithms and detecting specific features of the multiblock computing based on implicit finite-difference equations. The efficiency of the proposed approaches is proved by a six-fold speed-up of computations.Работа выполнена при поддержке гранта РФФИ 19-07-00423 А

Experimental determination of B-T phase diagram of YBa_2Cu_3O_7-d to 150T for B perpendicular to c

The B-T phase diagram for thin film YBa_2Cu_3O_7-d with B parallel to the superconducting layers has been constructed from GHz transport measurements to 150T. Evidence for a transition from a high T regime dominated by orbital effects, to a low T regime where paramagnetic limiting drives the quenching of superconductivity, is seen. Up to 110T the upper critical field is found to be linear in T and in remarkable agreement with extrapolation of the longstanding result of Welp et al arising from magnetisation measurements to 6T. Beyond this a departure from linear behaviour occurs at T=74K, where a 3D-2D crossover is expected to occur.Comment: 4 pages, 4 figure

OPTIMIZATION OF CHEMICAL-TECHNOLOGICAL PROCESSES AT PARTIAL UNCERTAINITY OF INITIAL INFORMATION

The algorithms and programs of the flexibility evaluation and solving optimization problems of the chemical-technological processes in the conditions of the physical-chemical information inaccuracy have been developed. The original methods for determination of the optimal safety factor at design have been developed. The programs are used at the Research Physical-Chemical InstituteAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio