基于区域分解的共轭梯度法的有限元结构分析并行计算

1 Introduction Large and complex engineering problems often needmuch computation ti me and storage to run on ordinaryuniprocessor computers . Even if they can be solved ,powerful computation capability is required to obtainaccurate and reliable results within reasonable ti me .Parallel computing can meet requirements of high per-formance computing[1].Various types of parallel hard-ware architectures have been developed and parallelalgorithms adapted to these hardware architecturesproposed[2 ,3…     

Parallel computing for finite element structural analysis using conjugategradient method based on domain decomposition

1 Introduction Large and complex engineering problems often needmuch computation ti me and storage to run on ordinaryuniprocessor computers . Even if they can be solved ,powerful computation capability is required to obtainaccurate and reliable results within reasonable ti me .Parallel computing can meet requirements of high per-formance computing[1].Various types of parallel hard-ware architectures have been developed and parallelalgorithms adapted to these hardware architecturesproposed[2 ,3…     

东北黑土区小流域侵蚀产沙WaTEM/SEDEM模型模拟

东北黑土区是我国重要的商品粮基地。近年来,受自然因素及人类不合理活动的影响,土壤侵蚀严重。土壤侵蚀模型是预测侵蚀产沙的重要工具,Wa TEM/SEDEM模型是一个分布式模型,本文以黑龙江省拜泉县25个水库控制流域为研究对象,采用Wa TEM/SEDEM模型模拟小流域侵蚀产沙特征,得到如下结论:研究区模型泥沙输移系数KTC最佳组合为0.38和0.55;利用Wa TEM/SEDEM模型模拟得到的产沙量(SY)与实际值相近,相关系数为0.95;产沙模数(SSY)的模拟值与实际值相关系数为0.34,相关程度相对较低,但均比回归方程模拟得到的产沙量和产沙模数相关程度高。流域泥沙输移比平均值为0.32。以齐心水库控制流域为例,模型模拟发现,流域平均侵蚀模数为351.2t/(km2·a),将齐心水库控制流域模拟结果与临近研究区的有关研究进行对比,证实Wa TEM/SEDEM在黑土区模拟流域侵蚀产沙有很好的应用前景。该研究可为黑土区土壤侵蚀与水土保持措施实施提供科学依据。     

小型均质土坝的安全鉴定方法与综合评价

通过对某水库运行以来存在的各种问题,结合土工试验和调查资料,从防洪标准复核、渗流安全分析、结构安全复核、现场调查等方面对该水库的安全状况进行了分析评价,本文可为同类工程提供参考。     

连铸中间包挡渣堰系统的优化研究

本文介绍了本钢炼钢厂通过对连铸挡渣堰系统的优化研究,提高了中间包挡渣堰系统的冶金功能,保证了连铸坯的质量,尤其是内部质量满足高附加值钢种的要求,实践证明,新型挡渣堰系统的使用寿命及使用效果完全满足大生产要求,具有良好的推广应用价值.     

岳英山水库除险加固工程设计

本文首先介绍了岳英山水库的概况,分析了工程现状。针对水库除险加固的主体工程即坝体工程、溢洪道和输水洞设计,从主坝坝坡整修、副坝迎水坡放缓及护坡、坝基防渗溢洪道和输水洞等方面进行了探讨。     

Theory and application of loss of life risk analysis for dam break

The loss of life risk evaluation model for dam break is built in this paper.By using an improved Monte Carlo method,the overtopping probability induced by concurrent flood and wind is calculated,and the Latin Hypercube Sampling is used to generate random numbers.The Graham method is used to calculate the loss of life resulting from dam failure.With Dongwushi reservoir located at Hebei Province taken as an example,the overtopping probability induced by concurrent flood and wind is calculated as 4.77×10-6.Loss of life is 24 220 when the warning time is 0.25-1 h and flood severity understanding is vague,which indicates that the risk is intolerable.The losses of life under three other conditions are tolerable:warning time 0.25-1 h,and precise flood severity understanding;warning time more than 1 h,and vague flood severity understanding;warning time more than 1 h,and precise flood severity understanding.     

黑泉水库溃坝洪水演算方法简介

通过对黑水库溃坝洪水量演算,分析性地介绍了溃坝洪水计算中一些简而蝗行的计算方法。     

志丹县泥浆泵筑坝土料的物理力学性质研究

以陕西省志丹县顺宁镇任坪村保娃沟门流域的前拐沟黄土作为研究对象,按照土工试验规程（SL237-1999）进行分类、击实、渗透等各项试验,对试验结果进行分析。分析结果表明,该流域黄土的Cu〉5,Cc∈（1,3）,小于0.005mm的土粒含量18.95%,土料的液限ωL平均为27.98%,塑限WP平均为17.10%,塑性指数Ip平均为10.89;土样最大干密度为1.70g/cm^3,最优含水率为14.99%;渗透系数为4.32×10^-5cm/s。该区土壤粒径分布不均匀且级配良好,渗透性较好,适合筑坝工程要求。     

一曲悲愤交加的爱国呼号——《松花江上》歌词赏析

张寒晖创作的《松花江上》唱遍了大江南北,对抗日战争的胜利起到了积极的推动作用,其歌词写出了东北民众记忆中刻骨铭心的乡愁,刻画了现实中颠沛流离之苦,吟唱着对父母对亲人撕心裂肺的呼号以及国破家亡的悲愤,一咏三叹,回环往复,唤起了全国人民的深深共鸣。不愧为一篇优秀的词作。