Intelligent Tester for Geotextiles Products-Determination of Water Flow Capacity in their Plane

IntroductionThe manufacture of geotextile and the relevant product(s) thereof, a penetrating polymer material used in rock soiland geotechnical engineering, synthesizes technicalachievements in such industrial departments as textile,chemical industry, plastics, papermaking and the like. Sincethe characteristic of geotextile and the related product ( s)thereof is closelyrelated to kind of raw material, manufacturetechnique, product standard and the like, and th…     

冷压对Bi2223/Ag多芯带材超导性能的影响

在Bi2223/Ag超导多芯带材的制备过程中,采用了热处理-冷压-热处理的工艺,取压力、压下速率、摩擦系数和来料作为待研究的冷压工艺参数,以带材的临界电流值为评价指标,用正交法设计实验方案,结果表明:摩擦系数对带材临界电流值的影响高度显著,压力和来料对带材值的影响显著,压下速率对带材值的影响程度最小.     

基于黑箱的自动软件测试工具的质量保障方法

软件测试需要合适的自动测试工具的有效支持，此时保障测试工具质量的问题显得尤其重要，介绍了两种针对基于黑箱的自动软件测试工具的质量保障方法，并详细讨论了软件故障注入方法，长期测试实践证明了这些方法对保障铁路计算机联锁软件测试评估平台的检测能力和可靠性是非常有效的。     

水文地质求参实际问题探讨

针对野外水力试验常遇到的四种实际情况，根据非稳定井流理论和势函数叠加原理导出了它们各自的求参公式。对于单孔稳定抽水试验可用水位达到稳定之前的非稳定资料求参；而提水试验可通过把提水过程概化为连续的非稳定抽水过程，再利用其水位恢复资料求参；其它两种情况也是利用稳定之前的非稳定资料和水位资料求参的。     

测井精细解释在碳酸盐岩气藏储量计算中的应用

随着成象测井、核磁共振测井等新一代测井技术的飞速发展,测井精细解释技术在碳酸盐岩气藏储量计算中所起的作用越来越重要。结合四川地区的探井测井解释的情况,探讨了测井精细解释的主要工作内容及根据探井精细解释确定储量参数、RFT地层测试技术确定气水界面和测井地震有机结合进行储层横向预测的方法原理,最后以坡1井、雷14井、大天5井和罗家寨构造为例,介绍了测井精细解释技术在碳酸盐岩气藏储量计算中的良好应用情况。结果表明,应用该技术可提高碳酸盐岩气藏储量计算的精度。     

The Application of Similarity Theory in Designing Large Deflection Buckling Spring-Piece

Large Deflection Buckling Spring-Piece (LDBSP) refers to the deformation of an end-fixed flat spring-piece under normal loadings. Plastic deformation usually appears in LDBSP.The static characteristic curve is very particular, because within its linear deflection region, the spring constant can be designed to be any value from minus to plus. With its obvious advantages of large liner deflection range, low spring constant, etc., the LDBSP has now been extensively applied to the exciting device, low-frequency shock absorbers and so on. The static characteristic curve of LDBSP belongs to the nonlinear problem of an arch with varying section. Therefore, it is difficult to obtain it theoretically. The formulae for designing LDBSP have not been set up yet. In this study,the authors apply similarity theory to analyze the liner deflection range A and the spring constant K, and derive the relationship of similarity criterion, finally obtain a set of formulae for designing LDBSP by model test and the least square method, which can be applied in engineering design.Through the research, it is proved that it is unnecessary to keep geometrical similarity of spring-piece shape. This fact extends the application scope of the formulae. The proposed formulae for designing LDBSP thereby can be applied for any dimensions within the range allowed.     

准整型设计变量的优化方法——浮动随机试验法

本文介绍的适合于准整型设计变量(包括离散变量)优化设计的新方法,是以随机试验法为基础,在n维空间建立逐步缩小的浮动样本空间,在搜索过程中它逐步向最优解逼近。新方法的特点是程序简单,可以较精确地求解10维以下的等式或不等式约束问题,无需提供偏导数。与传统的随机试验法相比计算速度可提高几十倍到几百倍。     

用Millikan油滴实验探测分数电荷

本文采用Monte Carlo方法计算Millikan油滴实验的总不确定度及全分辨本领,结果表明,该实验可用于测量分数电荷。在此基础上,通过对123个油滴电荷的测定,观测到一个呈现分数电荷的事例。     

股市价格指数成交量的单位根及因果关系检验

对上海证券指数收市价及成交量作了ADF检验，发现指数收市价存在有单位根，价格服从随机行走模型，成交量趋势平稳，市场是有效的．用葛兰杰(Granger)因果关系检验发现指数收市价增量与成交量增量互为因果关系，没有谁变化在先谁变化在后的问题。