环

In this paper, the main results about the socles of crossed products are generalized to group graded rings.

将关于交叉积的基座的主要结果推广到了群分次环上，得到了群分次环的基座的一些具体刻划，特别地，证明了对有限群G和强G 分次环R ，有Soc SocR soc｜G｜。

CO2 and H2S exist in the hydrocarbon zone and foramtion water,as the accompany gases of petroleum and nature gaso or components of formation water,which will cause corrostion to the cement sheath under certain conditions of humidity and pressure.It will decrease the cement sheath's alkalinity,which results in the decrease of cement sheath's strength,permeability increase,and places a premium on fluid channeling and borehole wall sloughs accident in plastic formation,shortening the oil- gas well's production lifetime and giving rise to tremendous ecomonic losses.

CO2和H2S作为石油和天然气的伴生气或地层水的组分存在于油气层或地层水中，在一定的湿度及压力条件下会对固井水泥环产生腐蚀作用，从而降低水泥环的碱性，使水泥环强度下降，渗透率增大，并诱发流体窜流、塑性地层井壁跨塌等事故，从而缩短油气井的生产寿命，造成巨大的经济损失。

The cyclization of carbodiimides 2 and 6 with phenol or alcohol was studied and the results showed that the cyclization of carbodiimides 2 and 6 with phenol in the presence of solid potassium at room temperature to 40℃, the cyclization of carbodiimides 2 and 6 with alcohol should in the presence of RONa.

进一步研究了碳二亚胺2和6与酚和醇的成环反应，结果表明该碳二亚胺与酚反应在碱(固体K_2CO_3)催化条件下，室温或加热到40℃便可顺利关环，与醇反应需要用到更强的碱醇钠催化才可以顺利关环。

These catalysts were employed in the HKR of epichlorohydrin, styrene oxide and phenyl glycidyl ether.

研究了其对环氧苯乙烷、环氧氯丙烷以及苯氧基环氧丙烷等的水解动力学拆分的催化作用。

Underoptimal conditions, in toluene / dimethyl phthalate / TBP, after EAHQ was oxidizedwith 〓, then the catalyst and styrene were added, the conversion of styrene basedon EAHQ is 68%, the selectivity for styrene oxide based on styrene is 92% and theTON of the catalyst is 500; in toluene / phenyl ether / TBP, epoxidation of styrenewas performed with 〓 generated in situ, the conversion is 46%, the selectivity is94% and the product can be separated by distillation under reduced pressure.

优化条件下，甲苯／邻苯二甲酸二甲酯／TBP(2／2／1，体积比)中，EAHQ先用〓氧化完全后，再加入催化剂A和苯乙烯进行环氧化反应苯乙烯相对于EAHQ的转化率为68％，生成环氧苯乙烷的选择性为92％，催化剂A的TON达到500；甲苯／二苯醚／TBP(1／3／1，体积比)中，原位生成〓条件下苯乙烯相对于EAHQ的转化率为46％，生成环氧苯乙烷的选择性为94％，产物可通过减压蒸馏分离。

The notions of algebras of quotients and weak algebras of quotients for Lie color algebras are given.

利用经典环论中由环构造商环的方法，人们得到了李代数的商代数的概念。

Kit consists of: Seat, Stem assembly, Spring, Two piston o-rings, Flow tube O-rings and Cover O-ring.

组件包括：阀座，阀杆总成，弹簧，两个活塞O形环，流量管O形环和阀盖O形环。

According to it ,a soluting of digital control system of DC motor using TI's TMS320LF2407 is prese...

针对以上情况，本课题采用TI公司的TMS320LF2407作为控制器，提出了基于位置环和速度环的双闭环全数字直流电机伺服系统控制方案。

It's optimum to set it at the location around the third insulator from the conductor side. According to the experiments, the corona discharge often happens around the groove between the ball pin and the porcelain shell.

均压环可以有效的改善导线侧绝缘子的分布电压，经过对均压环的优化计算表明，在能保证放电间隙有足够闪络距离的条件下，均压环装在靠近导线侧第3片绝缘子上下的位置最佳。

Based on the conformational analysis of diphenylacetylene, which can be viewed as the structural unit of PAMs, a new method for analyzing ring strain energy is proposed and used to analyzing the ring stain energy and the structural characteristics of the PAMs.

基于对大环分子构单元二苯乙炔分子的构象分析，提出了一种新的环张力能分析方法，并且用这种方法分析了分子环张力特性和几何结构特性。

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。