A review of the cmr mechanism in perovskites . this chapter gives review of cmr mechanism , earlier research works on gmr mechanism are listed . some special physics concepts , such as double exchange ( de ) , jahn - teller ( j - t ) effect , electron - phonon coupling , are interpreted 第三章综述了对钙钛矿结构氧化物巨磁电阻效应机制的研究,对cmr产生机理做了简单的介绍,并对诸如双交换( de )作用、 jahn - teller效应、电荷有序等物理概念有所认识的基础上总结了已经报道的对巨磁电阻效应机制的研究,最后指出探索cmr效应及其相关现象的途径。
We studied the influence of the interface strain and it shows that the lattice mismatch between substrate and film is the main reason of the above observations . expand strain decreases tm - i with increasing resistivity and compressed strain has the opposite effect . using double exchange model of zener these results can be explained qualitatively 27欧姆厘米,转变温度是78与154开尔文,磁场强度为7t时,磁阻率为习3及巧6 x结合双交换模型和不同的应力作用,逐一解释了产生差异的缘由,其中我们也讨论了具有)取向的la 。
Triparental mating was then performed . as a result , we obtained 91 recombined plasmids , 23 possible single - cross mutants and 53 possible double - cross mutants . pcr analysis of the genomic dna from the resulting possible double - cross mutants indicated that 6 of them were wild - type , 4 of them were single - cross mutants and the remainder ones were true double - cross mutants 本研究共构建了91个体外基因中断结构,获得23个可能的单交换突变体, 53个可能的双交换突变体,对所得的双交换突变体进行pcr验证发现有6个为野生型, 4个为单交换突变体,其余43个均为真正的双交换突变体。
This thesis contrasts and analyses the different calculation - method , and improves the genetic algorithm in the parameter inversion of the rock and soil engineering . the strategies are mainly in the following three aspects : 1 , new searching way is compositely searching genetic algorithm which is made up of the acceleration method and genetic algorithm when it partially calculates in the later time ; 2 , index function is inducted in gengetic operators , at the same time repeated select and double exchange pool are used ; 3 , splicing crossover , which reserves some new evolution factions , improves authority function accaunting the capabilities and kinds 本文对优化算法中不同求解方法进行对比分析,针对遗传算法在岩土工程参数反演运算中进行了改进,改进的策略主要集中于三个方面: 1 、提出了在遗传算法中融入形加速法的改进方法? ?复合遗传搜索法; 2 、针对遗传算子的选择策略,引入指数适值方法,设置双交换池,提出了重复筛选法; 3 、加强对劣势种群的内部优良信息的遗传功能的改进,引入权函数,扩大可交叉算子的种类,保留各算子的进化功能,提出了融合交叉运算法。
The result of blastx shows that one orf is extracellular serine protease precursor gene ; 3 orfs function as regulatory genes ; 5 orfs are involved in secretion pathway ; 2 orfs are related to production of lps ; and the annotation functions of the other 3 orfs are not clearly related to extracellular protease prouduction . marker exchange method was used to study the relationship between the production of protease and the 3 orfs . a deletion mutant of xcc _ 4463 was constructed successfully Orf注释表明,共中一个基因为胞外蛋白酶结构基因, 3个基因与合成调控有关, 5个与转运分泌有关, 2个与lps合成有关,其余3个orf的注释功能与胞外蛋白酶的关系未见报道,为研究这3个orf与胞外蛋白酶产生的关系,采用同源双交换orf缺失法进行了进一步验证,成功地构建了xcc _ 4463缺失突变体,所得缺失突变体经检测胞外蛋白酶减少,在寄主上致病性降低。
Openarchitect ha , a layered application for dual switch chassis , provides a high - speed , fault - tolerant , end - to - end " ip transparent " failover solution for " hot - swappable " ethernet - based payload blades on a switch - to - switch , vlan - to - vlan , or port - to - port basis . the zx5000 gigabit ethernet base interface enables significant capacity for control plane throughput , and when configured for full redundancy , traffic can switch to a backup blade , enabling high availability of platform service Openarchitect ha ,一个支持双交换系统的分层管理软件,为"可热插拔"的基于以太网协议的单板计算机在交换到交换或vlan到vlan或端到端基础上提供了一个高速容错点到点的"与ip无关的"错误切换解决方案。
The deletion mutants were proved to be genetically stable , and thus might be promising strains in industrial production of avermectins b . although s . avermitilis produces eight related components of avermectins , only two components , bla and bib , are available for the medical , veterinary and agricultural fields 该缺失突变是在染色体上通过同源双交换完成的,不会发生进一步的重组,因此突变株性状稳定,在工业生产上具有应用价值。阿维菌素的天然发酵产物共有八个组分,其中只有b1组分的杀虫活性最高,被作为杀虫剂在农业和畜牧业中使用。