On Principally Left Strong Radicals

Principally left strong radicals were introduced in [4]. Here, we continue to study such radicals. Principally left strong radicals and their semisimple classes are characterized in Section 2. Sections 3 and 4 are devoted to the lower principally left strong radical construction and to the upper principally left strong radical construction, respectively. This revised version was published online in June 2006 with corrections to the Cover Date.     

关于蕴涵BCK—代数的伴随半群

我们证明了蕴涵BCK-代数的伴随半群是一个上半格;具有条件（s)的蕴涵BCK-代数的伴随半群是一个广义布尔代数。更进一步证明了有界蕴涵BCK-代数的伴随半群是一个布尔代数。     

四边简支正交各向异性波纹型夹心矩形夹层板的固有频率

给出了一种把具有波纹型夹心的正交各向异性夹层板的控制方程组化为仅包含一个位移函数的单一方程的简单方法,从而获得了四边简支条件下其自由振动固有频率的精确解,同时还对两种具有重要实际意义的特殊情况进行了讨论。     

向量互补问题和极小元问题

本文不仅引入了非空集的有效下界的概念,而且引入了新的严格C-伪单调映射,在C-伪单调性的假设下,文内证明了向量互补问题（VCP）的可行集及其相关集合的有效下界和下有效点的存在性。     

青藏高压东侧偏北大风对梅雨暴雨影响的合成分析

利用常规观测资料对1991～1996年江淮地区梅雨大暴雨期的高、低层流场进行合成诊断分析,结果表明,梅雨期暴雨时,在对流层上部,由于青藏高原向东扩、在高压东侧出现偏北大风轴,由此构成的高空辐射区随着高压的东移而东移,它常常位于低空急流前端的上空、形成上层东北风,下层西南风的特殊耦合关系。     

Exact Penalty Functions for Convex Bilevel Programming Problems

In this paper, we propose a new constraint qualification for convex bilevel programming problems. Under this constraint qualification, a locally and globally exact penalty function of order 1 for a single-level reformulation of convex bilevel programming problems is given without requiring the linear independence condition and the strict complementarity condition to hold in the lower-level problem. Based on these results, locally and globally exact penalty functions for two other single-level reformulations of convex bilevel programming problems can be obtained. Furthermore, sufficient conditions for partial calmness to hold in some single-level reformulations of convex bilevel programming problems can be given.     

具有P?schl-Teller型标量势与矢量势的Klein-Gordon方程和Dirac方程的束缚态

给出了具P?schl-Teller型标量势与矢量势的Klein-Gordon方程和Dirac方程的s波束缚态解. 关键词： P?schl-Teller势 Klein-Gordon方程 Dirac方程 束缚态     

Newman-Penrose Formalism and Gravitational Impulsive and Shock Waves

Vacuum spacetimes endowed with two commuting spacelike Killing vector fields are considered. Subject to the hypothesis that there exists a shearfree null geodesic congruence orthogonal to the two-surface generated by the two commuting spacelike Killing vector fields,it is shown that, with a specific choice of null tetrad, the Newman-Penrose equations are reduced to an ordinary differential equation of Riccati type. fiom the consideration of this differential equation, exact solutions of the vacuum Einstein field equations with distribution valued Weyl curvature describing the propagation of gravitational impulsive and shock wave of variable polarization are then constructed.     

第三讲 量子纠缠态

量子纠缠是量子力学的奇妙特性之一 .文章对量子纠缠的历史作了简单回顾 ,介绍了近年来在纠缠的度量和纠缠态的判别及其分类方面的主要进展 .     

相对论类空方程

根据Dirac类空自洽性条件的思想,通过引入类空因子定义了类空波函数.它的物理部分与Bethe-Salpeter波函数相一致.利用普适的相互作用核的重排技术,导出了对于束缚态和散射态的相对论类空方程,并且将它们推广到多粒子的情形.也得到了束缚态类空波函数的归一化条件和散射态类空方程的非齐次项的解.因此,建立起了相对论类空方程体系.