Some properties of the generalized TTT transform

Recently Li and Shaked [2007. A general family of univariate stochastic orders. J. Statist. Plann. Inference 137, 3601–3610] introduced the generalized total time on test (GTTT) transform with respect to a given function ?$?$. In this paper we study some properties of it which are related with stochastic orderings. A concept of Lehmann and Rojo [1992. Invariant directional orderings. Ann. Statist. 20, 2100–2110] is applied to a new setting and the GTTT transform is used to define invariance properties and distances of some stochastic orders. Iterations of the GTTT transforms are also studied and their relations with exponential mixtures of gamma distributions are established.     

“V＋N＋的＋O”结构分析

V+N+的+O结构有甲、乙、丙三种格式,其句法来源是V+(N+的+O)、N+(V+O)和(V+O)+N.甲式为V+O的自然扩展式,N是领属定语;乙式和丙式为N强制性地裂割V+O并插入其中而造成的离散式,N是准定语.为了满足语用需要,N从主语位移至定语位,N+(V+O)变换成乙式; N从宾语位移入定语位,丙式成为被抑制格式(V+O)+N的一种自由的补偿形式.对同一语义结构的不同句法形式进行选择,是语用平面的核心内容;同义句式维持着语义平面动核与题元关系的大同,体现着语用平面不同交际需求的小异.     

核糖体失活蛋白及研究进展

核糖体失活蛋白是一类广泛存在于高等植物体内的能抑制核糖体功能的植物毒蛋白 ,分单链和双链两种 ,除了能使蛋白质合成受阻外 ,还具有抗生育、抗肿瘤和抗艾滋病病毒等诸多生物活性     

社会管理创新的系统模式构建研究

社会管理创新对我国和谐社会创建具有重大的理论与实践意义.通过回顾我国社会管理发展的历程、现状、存在的问题以及创新社会管理所面临的挑战,总结出社会管理创新的核心是构建起一套科学且具有可行性的管理系统模式.文章在已有的社会管理理论基础上,提出了社会管理创新的“12345N系统模式”以及在此系统模式的基础上加强和创新社会管理的对策建议.     

“甲型H1N1”流感防控中的公共卫生伦理难题

今年3月全球暴发“甲型H1N1”流感疫情,我国政府高度重视“甲型H1N1”流感的应对工作。在“甲型H1N1”流感防控中,在公共卫生伦理原则之间出现了相互冲突的伦理难题。只有遵循公共卫生伦理学中的四大基本原则：效用性原则、尊重原则、共济原则、相称性原则,才能够解决目前出现的难题。解决这些难题对于公共卫生机构和工作人员在应对的行动上有着重大的意义。     

“一＋N”的词汇化与语法化——以“一概”的个案研究为例

“一＋N（名词）”比较容易发生词汇化和语法化。“一概”最初是松散的定中短语,容器和内容没有凸显与否之分;当其高频连用发生词汇化演变为形容词时。凸显的是内容间的“一样,相同”,“一概”的词汇化和语法化都在唐代发生,词汇化只是为语法化提供了一个过渡,所以词汇化的用法没有在现代汉语中保留;当其进一步发生语法化为总括副词时,凸显的是容器的“全部,没有例外”。在“一概”词汇化和语法化的演变过程中,句法、语义和认知三者都在起作用。     

Declining employment success of immigrant males in Sweden: Observed or unobserved characteristics?

Focusing on Nordic and Yugoslavian immigrant males, we study the determinants of employment success of natives and immigrants in Sweden. Furthermore, we investigate the reasons behind the arising gap in employment success between Swedes and immigrants from 1970 to 1990. In a decomposition analysis, we find that the main part of the decline in the employment probability of immigrants relative to Swedes over time is explained by a change in coefficients (unobserved characteristics) rather than a change in determinants (observed characteristics). Received: 22 June 1998/Accepted: 23 March 2000     

一类多时滞中立型控制系统的绝对稳定性

研究了有多个执行机构的多滞后中立型直接和间接Lurie控制系统的绝对稳定性,借助于Lyapunov泛函构造方法,给出了关于Lyapunov泛函中正定矩阵和积分项参数的线性矩阵不等式(LM I)的稳定性判别准则,且与时滞量的大小无关。最后举例说明了本文结果的有效性.     

强N_2-局部连通无爪图的Hamilton性

运用反证法的证明技巧,对任一无爪图G及其圈C,证明了只要C上有一个接触点是强N_2-局部连通的,则C一定不是最长圈.即证明了强N_2-局部连通无爪图是Hamilton图.     

Comparison of dispersal ability between the green leafhoppers,Nephotettix virescens andN. cincticeps (hemiptera: Cicadellidae) by tethered flight

Summary Dispersal propensity of green leafhoppers was compared between a tropical species,Nephotettix virescens, and a temperate species,N. cincticeps. The flight ability was measured with tethered flight technique under laboratory conditions (25°C, 16L-8D). The pre-flight period was shorter and the flight duration was longer inN. virescens than inN. cincticeps in both sexes. No significant correlations were found between the flight activity and morphometric characters for either of the two species. The results suggested that dispersal propensity ofN. virescens is higher than that ofN. cincticeps.