Investigation of highly efficient algorithms for solving linear equations in the discontinuous deformation analysis method

Large‐scale engineering computing using the discontinuous deformation analysis (DDA) method is time‐consuming, which hinders the application of the DDA method. The simulation result of a typical numerical example indicates that the linear equation solver is a key factor that affects the efficiency of the DDA method. In this paper, highly efficient algorithms for solving linear equations are investigated, and two modifications of the DDA programme are presented. The first modification is a linear equation solver with high efficiency. The block Jacobi (BJ) iterative method and the block conjugate gradient with Jacobi pre‐processing (Jacobi‐PCG) iterative method are introduced, and the key operations are detailed, including the matrix‐vector product and the diagonal matrix inversion. Another modification consists of a parallel linear equation solver, which is separately constructed based on the multi‐thread and CPU‐GPU heterogeneous platforms with OpenMP and CUDA, respectively. The simulation results from several numerical examples using the modified DDA programme demonstrate that the Jacobi‐PCG is a better iterative method for large‐scale engineering computing and that adoptive parallel strategies can greatly enhance computational efficiency. Copyright © 2015 John Wiley & Sons, Ltd.     

华北地区强震前后的 h 值及“震情窗口”变化

邢台、渤海、海城以及唐山大地震前1年内,围绕震中甚至距离震中500多公里的地区发生的某些震群,出现衰减系数异常(h≤1)。同时发生在林县、太原、长岛地区的小震群,其月频度几乎同步出现峰值。称林县、太原、长岛地区为“震情窗口”。强震前区域震情h值异常和“震情窗口”变化呼应,对判断未来强震三要素是有益的。     

Numerical Modelling of the Effects of Ozone on the Summer Atmospheric Circulation

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The Mathematic Models of the Kalman Filtering for Across-Fault Measurement

This paper makes a probe into the application of the Kalman filtering method to the data processing of across-fault measurements.On the basis of statistical regression,the mathematic and stochastic models of filtration are established by combining the regression method with Kalman filtering.In the filtering computation,not only the randomness of fault movements but also the time-dependent variation of environmental effects have been taken into consideration.By use of the adaptive filtering method,an estimation of the dynamic noise variance matrix is obtained through iteration.Models for one measuring line(leveling line or baseline),two measuring lines(both leveling lines or both baselines)and four measuring lines(two leveling lines and two baselines)are derived and established systematically.By means of these models,the data of across-fault measurements can be processed dynamically in real-time to provide the filtered values of height difference between benchmarks or baseline length at different time in     

Relocation of Hypocenters in the Bohai Sea and Adjacent Areas

In this paper a method of relocating hypocenter in inhomogeneous medium is introduced.Based on the velocity from the latest results on the crust and mantle structure of the Bohai Sea and its adjacent areas,by using the data recorded in Shandong,Hebei,Beijing,and Liaoning networks around the Bohai Sea we apply the method to relocate hypocenter parameters of 598 events occurring in the Bohai Sea and its adjacent areas.The accuracy of hypocenter relocation is discussed.We present the results of events ML≥4.0 in the Bohai Sea in recent years and discussed the distribution of focal depths.     

电气石和水之间的氢同位素分馏

作者对电气-水体系氢同位素平衡分馏和动力学分馏和动力学分馏开展了实验研究，丰富了羟基矿物氢同位素分馏资料。本文对该研究的实验技术、分析方法作了介绍，并对实验结果进行讨论与国外已有的该方面的资料作了对比。在800-650℃时电气石和水之间氢同位素平衡分馏系数与温度间线性关系为103lna电气石-水=-28.24（106/T2）+2.60；交换速率常数与温度间关系为lnk2=-0.19-6.70（103/T）     

南极地区小象幅航测内业成图

本文阐述了用１２０型非量测相机对南极中山站地区所摄制的１４００００小象幅航片制作１５０００地形图、正射像片图及１１００００地形图的原理、方法和精度。在外定向中适当增加控制点及考虑到加入适当的权的情况下，其外定向最大对点误差平面为２．２ｍ，高程为１．２ｍ。所制作的正射像片图和相应的地形图套合中误差为０．１４ｍｍ。其结果完全可满足南极科研、考察的要求     

豫西山区与承德基地相似距研究

用修改欧氏距离和马氏距离，分析了豫西山区不同海拔与河北省承德地区，全国闻名的良种繁育基地玉米制种的农业气候相似性．确定了与承德地区相似的玉米制种海拔界限为３３４－１２１５ｍ．其中海拔５００ｍ以上农业气候条件更为适宜．     

锂离子选择电极的研究 Ⅲ.：开链聚醚三（二环己酰胺）锂电极的制备和应用

以合成的开链聚醚三(二环己酰胺)等中性载体制成了PVC膜Li~+电极,研究了载体结构、膜成分与电极性能的关系,在聚醚三酰胺的胺基中,以环己基取代直链的烷基,显著地改善了Li~+—载体的性能,以邻苯二甲酸二癸酯或其和二苄醚混合增塑的1,1,1—三[1′—(2′—氧杂—3′—二环己胺基羰基)丙基]丙烷Li~+—电极的线性响应范围为2×10~(-5)～10~(-1)mol/L LiCl,K_(Li+Na)~(pot)～8×10~(-3),以Mg(Ac)_2为离子强度调节缓冲剂,用标准比较法或样品加入法测定了LiCl—HCl—H_2O或LiCl—MgCl_2—HCl—H_2O体系中的Li~+,LiCl含量≥2％的样品,测定误差≤5％。