Nested multigrid vector and scalar potential finite element method for fast computation of two-dimensional electromagnetic scattering

Nested multigrid techniques are combined with the ungauged vector and scalar potential formulation of the finite-element method to accelerate the convergence of the numerical solution of two-dimensional electromagnetic scattering problems. The finite-element modeling is performed on nested meshes of the same computational domain. The conjugate gradient method is used to solve the resultant finite-element matrix for the finest mesh, while the nested multigrid vector and scalar potential algorithm acts as the preconditioner of the iterative solver. Numerical experiments are used to demonstrate the superior numerical convergence and efficient memory usage of the proposed algorithm.     

由呼出气中的氡浓度估计铀矿工体内~(225)Ra的负荷量

本文测量了某铀矿不同工种的56名矿工下矿井作业前的呼出气中的~(222)Rn浓度,并由此估算了他们体内的~(226)Ra 负荷量。按不同工种的人数加权,呼出气中的~(222)Rn 浓度平均值为34.1Bqm~(-3),体内~(226)Ra 负荷量的均值为1.95kBq。同时还对9名休息了2天的和2名离开井下作业3—4年的矿工以及12名来下过矿井的本矿工人呼出气中氡浓度进行了测量,由此估算出其体内~(226)Ra 负荷量的均值分别为1.11、0.94和0.17kBq。     

Interaction between uranium oxide alloyed with Al2O3·SiO2 and pyrocarbon coating during irradiation of micro fuel elements

Translated from Atomnaya Énergiya, Vol. 66, No. 3, pp. 191–193, March, 1989.     

一种改进的同步侦破和识别过失误差的方法

将线性组合技术引入过失误差同步估计法 ,用于确定候选过失误差子集。以一个循环网为例 ,对两种算法的性能进行了比较。对一个蒸汽系统的稳态数据校正仿真结果证明了该方法的有效性     

Mapping the index set of algorithm variables to a systolic structure

A formalized procedure is proposed for determining the input/out sequence and the stepping of variables in systolic or semisystolic computers. The procedure is applicable to the design of systolic arrays, as well as to existing computers.Translated from Kibernetika, No. 1, pp. 51–57, January–February, 1991.     

α厚层测量法的定标方法探讨

本文比较了几种常用的α厚层测量法的定标方法。实验结果表明,共沉淀法是一种比较理想的定标方法,它所制得的标准样品的定标曲线线性较好,探测效率较稳定。     

Forecasting Capillary Characteristics for Aluminum Nitride Ceramic ― Liquid Metal Systems

A test has been devised that allows one to determine the work of adhesion and wettability in a system composed of aluminum nitride ceramics with a liquid metal without the need for experimental examination. A correlation is examined between the work of adhesion on the one hand and that criteria or others on the other that have been proposed by various researchers. Forecasts are made for the work of adhesion and wetting angle for a series of metals that have not been examined previously. An experimental check has been made on the forecast adhesion activity for some elements.