环

Due to the inspiration of maximal injective module by professor Wang Ming-yi, in chapter two, we introduce the conception of max-projective modules, discuss its properties, applications: the primitive relations between rings and endomorphism rings, an equivalence that is surrounding strongly V.N. rings.

受汪明义教授引进极大内射模概念的启发，在第二章中我们引进了极大投射模的概念，由此讨论了它的一些性质及其应用：环与自同态环之间的本原性关系；强正则环的一个等价刻划；并在环为交换和非交换的情形下分别应用有限表现模的极大投射性得出了SF环和Von Neumann正则环的关系。

In chapter 5, we define the notions of *-μ-semirings as well as *-λ-semirings and also study the primary properties of them. We discuss the interrelation between *-μ-semirings and *-λ-semirings, and their relation with those semirings introduced above. In the end, we study the formal power series semirings of *-λ-semirings as well as weak inductive *-semirings.

第五章给出了*-μ-半环和*-λ-半环的定义和基本性质，讨论了这两类半环之间以及它们与归纳*-半环、弱归纳*-半环之间的一些内在关系并研究了它们的形式幂级数半环。

In this paper, tolerance analysis mainly relates to three methods, viz."Extremum Method","Statistics Method" and "method of Monte Carlo". The character of the "Extremum Method" is to calculate the limit dimension of the close loop according to every limit dimension of the composing loop in order to ensure an entire frogging character, and get the tolerance of close loop.

极值法"的特点从保证完全互换着眼，由各组成环的极限值计算出封闭环的极限尺寸，从而求得封闭环公差；"统计法的特点是从保证大数互换着眼，根据各组成环的实际尺寸在其公差带内的分布情况，按某一置信概率求得封闭环尺寸实际分布范围，由此决定封闭环公差。

Through comparing the ring and polynomial ring to power series, the defition and theorem of the ring and polynomial ring can be extended into power series.

通过对比环、多项式环与幂级数环，将环、多项式环中的性质推广到幂级数环中。

A general ring I is a clean general ring if and only if its power series ring is a clean general ring if and only if its skew power series ring is a clean general ring.

1一般环I是一般clean环当且仅当I的形式幂级数环是一般clean环当且仅当I的斜幂级数环是一般clean环。

Being combining with products distribution in styrene oxidation, we propose the styrene epoxidation carry out with Ti metallacyclo intermediates, And at the same time Ti-ZSM-5 have properties both catalytic epoxidation and acid-catalysis, namely the skeletal Ti can catalyze styrene epoxidation to styrene oxide and the skeletal Ti and Al can provide Lewis acid site to cause the rearrangement of styrene oxide to phenylacetaldehyde rapidly, the solvolysis to glycols and the cleavage of C=C double bond. Ti-ZSM-5 can also provide Bronsted acid site simultaneously, which is also catalytic center for the solvolysis to glycols.

同时结合Ti-ZSM-5催化选择性氧化苯乙烯反应的产物分布结果，提出苯乙烯环氧化反应可能是通过金属有机环机理进行；Ti-ZSM-5同时具有催化环氧化和酸催化两种功能，其骨架钛可催化苯乙烯环氧化生成环氧苯乙烷，而骨架钛和骨架铝等可提供Lewis酸位使环氧苯乙烷迅速发生重排生成苯乙醛从而使其成为反应的主要产物，同时还可发生加成以及碳碳键的裂解等副反应：Ti-ZSM-5也提供Bronsted酸位，它也是生成加成产物的活性中心。

To develop an eco-friendly epoxy impregnating resin system for groundwall insulation of large generators, the curing reaction mechanism has been fully studied, the formulation and the curing techniques have been optimized, and the influence of different constitution on the curing reaction, microstructure, and final performances have been studied and characterized.In this paper, influences of different reactive organo-siloxanes on the curing reaction and performances of epoxy V.P.I.

本文研究比较了含有环氧基、氨基或乙烯基的反应性硅氧烷，包括：γ-缩水甘油醚氧丙基甲基二乙氧基硅烷、β-(3，4环氧环已基)乙基三乙氧基硅烷、γ-缩水甘油醚氧丙基三甲氧基硅、β-(3，4环氧环已基)乙基三甲氧基硅烷、γ-甲基丙烯酰氧基丙基三甲氧基硅烷、乙烯基三乙氧基硅烷和苯胺甲基三乙氧基硅烷对环氧V.P.I。

Caption:: Saturn's icy rings shine in scattered sunlight in this view, which looks toward the unilluminated northern side of the rings from about 15 degrees above the ringplane. The Sun currently illuminates the rings from the south.

图中的土星环是由卡西尼号探测船以环面15度高的角度拍摄，由於现时太阳光由环的南面照射到环，现在所见的环是环的北面，不是被太阳光照射的一面。

The epoxide-terminated oligomer having ether mesogenic unit wassynthesized for the first time by reacting the diphenol with epichlorohydrin. Theepoxy equivalent increased as the elongation of reaction time or the decrease of theinitial ratio of diphenol and epichlorohydrin, but effect of the reaction time wassmaller than that of the initial ratio.

首次采用直接环氧化的方法合成了含酯类液晶基元的环氧结构预聚物，环氧化反应中反应配比和反应时间会影响产物的环氧当量；缩小反应配比或延长反应时间会使产物的环氧当量增大，反应时间对产物环氧当量的影响较小。5。

The stationary ring of the device is fixed on the cover of the pump, the rotating ring and the pump shaft are in the endwise slip connection. The elastic cell acts on the direction for the rotating ring to press the stationary ring, while the pump shaft outside the pump cover is hinged with the flying iron, of which the force transferring end acts in the direction for the rotating ring to deviate from the stationary ring.

本装置的静止环固定在泵盖上，旋转环与泵轴在轴向滑动连接，所配置的弹性元件作用于旋转环的压向静止环方向，泵盖外的泵轴铰接飞铁，飞铁传力端作用于旋转环的脱离静止环方向。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。