p3阶Cayley图的边Hamilton性

设G为有限群,|G|=p3,p为素数,M是G的一个生成集.证明了p3阶的Cayley图X(G,M)是边-Hamilton图.     

图的匹配多项式

文章主要研究特殊图的匹配多项式唯一的性质，得到了星图为匹配唯一的、蛇树和轮环图的匹配多项式及Y形图不是匹配唯一的等结论。     

Al-SiCp复合材料磨损表面分形维数的研究

旨在通过对SiCP增强Al基复合材料磨损表面的分形研究,更深入研究亚微米SiCP增强Al基复合材料的摩擦磨损特性与分形维数的关系。按照结构函数法,用MATLAB软件进行编程,得到复合材料双对数坐标图。研究标明,亚微米SiCP增强Al基复合材料的具有分形特性,且其分形维数与材料的磨损量有关,随着磨损量的增加,分形维数亦趋于增大。     

Reconstruction of linkage maps in the distorted segregation populations of backcross, doubled haploid and recombinant inbred lines

Non-Mendelian segregation of markers, known as distorted segregation, is a common biological phenomenon. Although segregation distortion affects the estimation of map distances and the results of quantitative trait loci (QTL) mapping, the effects of distorted markers are often ignored in the construction of linkage maps and in QTL mapping. Recently, we have developed a multipoint method via a Hidden Markov chain method to reconstruct linkage maps in an F2 population that corrects for bias of map distances between distorted markers. In this article, the method is extended to cover backcross, doubled haploid and recombinant inbred line (RIL) populations. The results from simulated experiments show that: (1) the degree that two linked segregation distortion loci (SDL) affect the estimation of map distances increases as SDL heritability and interval length between adjacent markers increase, whereas sample size has little effect on the bias; (2) two linked SDL result in the underesti- mation of linkage distances for most cases, overestimation for an additive model with opposite additive effects, and unbiased estimation for an epistatic model with negative additive-by-additive effects; (3) the proposed method can obtain the unbiased estimation of linkage distance. This new method was applied to a rice RIL population with severely distorted segregation to reconstruct the linkage maps, and a bootstrap method was used to obtain 95% confidence intervals of map distances. The results from real data analysis further demonstrate the utility of our method, which provides a foundation for the inheritance analysis of quantitative and viability traits.     

浅谈山区公路定线

按公路建设基本程序,公路初步设计审批后,即进入到路线的详测阶段,以便完成公路路线施工图设计。公路路线的勘测设计是公路建设的关键工作,而在详测阶段,公路的定线是整个详测工作的关键。     

浅析Autodesk Map 3D 在数字测图中的应用

文章通过对Autodesk Map 3D的主要功能的分析,介绍了它在数字测图中的一些具体应用,重点讨论了在土方量计算以及等高线绘制中应用问题。     

路与轮联图的邻强边色数

对一个正常的边染色满足相邻点的色集不同的条件时，称为邻强边染色，其所用最少染色数称为邻强边色数。就路与轮的联图，得到了在m,n任意取值情况下的邻强边色数。     

变频调速技术在细纱机恒张力控制中的应用

根据纱线长度，用变频器控制细纱机主轴转速，设计了纺纱过程中纱线恒张力控制．程序按照状态变化进行设计开发．实验结果表明，该设计达到设计要求．其产品已投入批量生产．     

一类广义Petersen图的邻强边染色

研究了一类广义Petersen图G(n,k)的邻强边染色,构造性地证明了:若n≡0(mod3),k≡/0(mod3),则χ_(as)~′(G(n,k))=4.其中χa′s(G(n,k))表示G(n,k)的邻强边色数.     

关于C_m∨K_(1,n)的邻强边色数

对一个正常边染色满足相邻点的色集不同,称为邻强边染色,其所用最少染色数称为邻强边色数.就圈Cm与星K1,n的联图CmVK1,n,文章中得到了在m,n不同取值情况下的邻强边色数.