基于adina的土钉支护有限元数值模拟

建立土钉支护的非线性有限元模型,土体本构采用Mohr-Coulomb模型,土钉之间采用Goodman单元模拟,能够模拟基坑的开挖与支护的施工过程。对某一具体基坑工程进行了模拟计算,取得了较满意的结果。     

中外优秀男子百米运动员技术特征的比较与分析

百米跑项目是一个典型的速度项目，百米跑水平的高低是衡量一个国家田径水平的重要标志．我国短跑水平低，特别是男子项目，与世界短跑先进水平存在较大的差距．笔者对中外优秀男子百米运动员的速度、步频、步幅等技术特征做了比较与分析，以期从中找出我国男子短跑水平落后的原因，从而为提高我国短跑的运动技术和运动成绩提供一些参考．     

水稻广陆矮4号与杂交水稻杂优1号染色体核型分析

对水稻广陆矮4号和杂交水稻杂优1号2个不同品种水稻前中期和正中期的染色体进行了核型分析比较，结果表明两者染色体的臂长、臂比和形态既有相似之处，又存在一定的差异，广陆矮4号水稻的核型公式：2n=2x=24=16m＋8sm，杂交水稻杂优1号的核型公式：2n=2z=24=18m＋6sm．同时结合G-显带技术，对2种水稻进行了比较分析，发现G-显带区别较大。说明水稻不同品种之间存在一定变异．     

机动目标空间合群仿真

为了解决空间合群和战场中的事件检测问题，提出了一种新的机动目标的空间群生成算法．该算法通过一级融合获得的信息来定义特征相似度，即归属相似度、位置相似度和速度相似度，并将这些相似度再次融合以求得合群结果．由于测量空间的不确定性被映射到了模糊相似度空间，因此通过模糊匹配机制可解决测量空间的不确定性问题．仿真结果表明，所提算法能实时完成多个级别的空间合群融合，其计算复杂度也比较低，而且在空间合群的态势评估中获得了比较好的结果．     

关于双参数C0半群的一些结果

为了丰富半群理论,利用经典的算子半群理论中的方法和双参数C0半群的概念,将单参数的C0半群的一些性质推广到双参数的C0半群,得到双参数的C0半群、生成元及其预解式的一些基本结果.     

River discharge changes in the Qinghai-Tibet Plateau

THE QINGHAI-TIBET PLATEAU IS SENSITIVE TO GLOBAL CLI- MATE CHANGES, AND ITS MEAN WARMING AMPLITUDE DURING THE PAST 50 YEARS IS GREATER THAN THAT OF THE NORTHERNHEMISPHERE AND OTHER REGIONS IN THE SAME LATITUDE[1,2]. DUE TO ITS SPECIFIC GEOMORPHIC CONDITIO…     

New field of cryptography： DNA cryptography

The vast parallelism, exceptional energy efficiency and extraordinary information density inherent in DNA molecules are being explored for computing, data stor- age and cryptography. In such research area, novel computers, data storage and cryptography mi…     

A Fault Detection Mechanism in Erasure-Code Byzantine Fault-Tolerance Quorum

Fault-tolerance is increasingly significant for large-scale storage systems in which Byzantine failure of storage nodes may happen. Traditional Byzantine Quorum systems that tolerate Byzantine failures by using replication have two main limitations： low space-efficiency and static quorum variables. We propose an Erasure-code Byzantine Fault-tolerance Quorum that can provide high reliability with far lower storage overhead than replication by adopting erasure code as redundancy scheme. Through read/write operations of clients and diagnose operation of supervisor, our Quorum system can detect Byzantine nodes, and dynamically adjust system size and fault threshold. Simulation results show that our method improves performance for the Quorum with relatively small quorums.     

壮族学生英语学习中母语的正向迁移

外语学习中母语迁移的影响是必然的。母语的迁移有两种:负向迁移和正向迁移。负向迁移往往会导致学习困难和错误,不利于目的语的学习;正向迁移在母语与目的语有相同形式时会出现,有利于目的语的学习。壮语在语言形式和结构及某些思维方式上比汉语更接近英语,在壮族学生的英语教学中,教师应通过英语和壮语的比较教学来充分利用正向迁移的影响,减少负面迁移的影响。     

Microbial starch-binding domains are superior to granule-bound starch synthase I for anchoring luciferase to potato starch granules

Microbial starch-binding domains (SBD) and granule-bound starch synthase I (GBSSI) are proteins which are accumulated in potato starch granules. The efficiency of SBD and GBSSI for targeting active luciferase reporter proteins to granules during starch biosynthesis was compared. GBSSI or SBD sequences were fused to the N- or C-terminus of the luciferase (LUC) gene, via an artificial Pro-Thr encoding linker sequence. The genes were introduced into an amylose-free (amf) potato mutant. It appeared that SBD was superior to GBSSI as a targeting sequence, mainly because the luciferase retained higher activity in the SBD-containing fusion proteins than in the GBSSI-containing ones.