2－机器FlowShop随机调度问题

本文讨论了２－机器ＦｌｏｗＳｈｏｐ调度问题，在假定同一工件在不同机器上的加工时间为同分布的随机变量且加工时间在随机意义下可以排序时，给出了等待时间差的绝对值总和的期望最小的最优排序的若干性质。     

诺丹冰草(Agropyron nordan)无融合生殖的胚胎学研究Ⅰ大孢子发生和雌配子体的形成

珠心表皮下分化出一个或两个孢原细胞，但只有一个继续发育，直接起大孢子母细胞的功能．蓼型胚囊．成熟胚囊助细胞丝状器不发达，到受精前反足细胞仅体积增大但不增殖，两极核相互贴近而不融合．受精前胚珠发育过程中，珠被、珠心细胞中始终无淀粉积累；成熟胚囊各细胞中均未发现淀粉粒，但合点端胚囊壁及周围珠心细胞中具强的ＰＡＳ正反应．同一珠心中发现有双胚囊现象，另外，在四分孢子旁发现由珠心细胞起源的孢原产生，认为诺丹冰草中有无融合生殖现象存在．     

浅析电子商务发展的障碍与对策

阐述了电子商务是计算机网络技术与通信技术在商业领域的具体应用，是未来企业参与国际竞争和拓展全球市场的崭新方式，具有良好的发展前景；提出了发展电子商务，促进企业信息化建设迫切需要解决的问题及其对策。     

锌基合金焊接工艺问题的探讨

本文对一种高铝锌基合金的焊接工艺问题进行了初步的探讨。在合金焊接性分析的基础上,探讨了相应的焊接方法、焊接材料和焊接工艺措施,并进行了试板的焊接。结果表明,在一定的焊接工艺条件下,使用钨极氩弧焊和与母材同质的焊丝,可以对ZA12材料进行有效的焊接。     

高电场下聚酯薄膜中陷阱捕获电子的特性研究

本文用表面电位测试技术研究了固体介质在强电场作用下陷阱捕获电荷的动力学特性.作者在考虑了碰撞电离退陷阱化后,获得的一级捕获动力学方程,定性地解释了电荷的捕获随施加电场的时间而变化的关系和捕获电荷稳态值随电场的增强而下降的现象。利用这个动态平衡模方程,经实验分析表明:这种捕获电荷稳态值随电场的增强而下降的现象是由于自由电子与陷阱化电子碰撞电离退陷阱化的结果,而不是陷阱化电子隧道效应或Poole-Frenkel效应的结果。当电场增强使碰撞电离退陷阱化达到一定程度时,介质便发生击穿。     

锌基合金熔化焊接头特征区域分析

通过对ＺＡ１２合金气焊、钨极氢弧焊接头试样的大量观察和研究。将锌基合金熔化焊接头分成４个特征区域：焊缝、熔合区、热影响区和母材，并详细地讨论了各特征区域的形貌特征及其形成过程。     

使用单个自适应神经元的智能控制

提出一种适用于控制的自适应神经元模型以及使用单个自适应神经元的智能控制方法,描述了神经元的学习策略和收敛性,给出了神经元系统控制学习算法及其学习控制机理证明.实例表明了这种新颖的智能控制方法简单可行的优点.     

Unique physiological and pathogenic features of Leptospira interrogans revealed by whole-genome sequencing

Leptospirosis is a widely spread disease of global concern. Infection causes flu-like episodes with frequent severe renal and hepatic damage, such as haemorrhage and jaundice. In more severe cases, massive pulmonary haemorrhages, including fatal sudden haemoptysis, can occur. Here we report the complete genomic sequence of a representative virulent serovar type strain (Lai) of Leptospira interrogans serogroup Icterohaemorrhagiae consisting of a 4.33-megabase large chromosome and a 359-kilobase small chromosome, with a total of 4,768 predicted genes. In terms of the genetic determinants of physiological characteristics, the facultatively parasitic L. interrogans differs extensively from two other strictly parasitic pathogenic spirochaetes, Treponema pallidum and Borrelia burgdorferi, although similarities exist in the genes that govern their unique morphological features. A comprehensive analysis of the L. interrogans genes for chemotaxis/motility and lipopolysaccharide synthesis provides a basis for in-depth studies of virulence and pathogenesis. The discovery of a series of genes possibly related to adhesion, invasion and the haematological changes that characterize leptospirosis has provided clues about how an environmental organism might evolve into an important human pathogen.     

On the Distribution of Prime Pairs

A new approach to the research into the distribution of prime pairs is developed, attached with corollaries about the distribution of prime triplets and generally about that of prime h-tuplets. It differs from the usual methods（involving the sieve method） for this kind of research, and bases on Chebyshev inequality and on the computation of average concentration of all the related subsets, and leads to the proofs of following lemma and theorem, attached with four corollaries：[Lemma 1] Among all the prime-pair-subsets there exists at least one such subset （namely one of the sets of generalized prime twins） which is an infinite set.[Theorem 1] All the prime-pair-subsets （namely all sets of generalized prime twins） or infinitely many prime-pair-subsets are infinite sets.[Corollary 1] Among all the prime-triplet-subsets there exists at least one such subset which is an infinite set.[ Corollary 2] All the prime-triplet-subsets or infinitely many prime-triplet-subsets are infinite sets. [Corollary 3] Among all the prime-h-tuplet-subsets there exists at least one such subset which is an infinite set, where h is an arbitrary finite integer ≥ 2.[Corollary 4] All the prime-h-tuplet-subsets or infinitely many, prime-h-tuplet-subsets are infinite sets, where h is an arbitrary finite integer ≥ 2.