选择性的

A rigorous coupled wave theory for the Bragg diffraction of a Gaussian beam in the uniaxial crystal is derived and a group of rigorous coupled wave equations and diffraction efficiency formula are obtained in terms of the proper coordinate transformation and Riemann method .

利用适当的坐标变换和黎曼方法建立了高斯光束在单轴晶体中布拉格衍射的严格的耦合波理论，获得了一组严格的耦合波方程和衍射效率计算公式，讨论了衍射效率随折射率调制量的关系以及波长选择性和角度选择性，同时分析了衍射效率对再现光宽度的要求。

Content This course sets on the basis of the organic chemistry and introduces the fundamental principles and methods of organic synthesis by focusing on the classes of reactions such as halogenation, rearrangement, oxidation and reduction reaction.

课程内容：本课程建立在有机化学的基础上，着重介绍了有机合成的基本原理和方法，以反应类型为主线，如卤化反应，重排反应，氧化反应，还原反应等，在介绍一些经典的合成方法和试剂的同时，对一些较新型的试剂在合成中的应用以及反应的立体选择性和区域选择性进行了讨论。

A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more esters of aromatic dicarboxylic acid internal electron donors; one or more aluminum containing cocatalysts; a selectivity control agent comprising at least one silicon containing compound containing at least one C1-10 alkoxy group bonded to a silicon atom, and one or more activity limiting agent compounds comprising one or more aliphatic or cycloaliphatic carboxylic acids; alkyl-, cycloalkyl- or alkyl-ester derivatives thereof; or inertly substituted derivatives of the foregoing.

一种用于丙烯聚合的催化剂组合物，所述催化剂组合物包括：一种或多种齐格勒-纳塔主催化剂组合物，该主催化剂组合物包括一种或多种过渡金属化合物和一种或多种芳族二羧酸酯内部电子给体；一种或多种包含铝的助催化剂；选择性控制剂，该选择性控制剂包括至少一种包含硅的化合物，该化合物包括至少一种与硅原子连接的C 1-10 烷氧基；和一种或多种活性限制剂化合物，该活性限制剂包括一种或多种脂族或脂环族的单或聚羧酸类、其烷基-、环烷基-或烷基-衍生物、或上述惰性取代的衍生物。

Firstly, proem, it concise introduces the background ; Secondly, it introduces the reform of the commission system and the dilemma of the securities companies in our country; Thirdly, it puts forward the idea of implementation of "Optionally differential strategies " as the natural choice for the future development of the securities brokers in our country , through the analysis of the current competitive environment of the securities companies in our country and study on the alternatives of competitive strategies ; The forth , it describes how to practice " Optionally differential strategies",which including three aspect: the choice of the core competition ability, the measures for the implementation are brought forth ,and the condition of practice the strategies; The fifth, it s the summary of the dissertation.

第一部分，简介论文写作背景；每二部分，介绍我国佣金制度改革以及改革后我国证券公司所面临的困境；第三部分，通过对现阶段我国证券公司竞争环境的分析，进行竞争战略选择研究，提出实施选择性差别化战略应成为我国证券商未来发展的必然选择。第四部分，提出"选择性差别化战略"的实施措施，包括拓展业务领域、拓宽交易渠道及改革证券商管理模式三方面可操作的内容；第五部分，对全文作概括性的总结。

Though scu--PA has some selectivtiy for fibrin and better specificity for throm- bosis in experimental animals, its selectivity for fibrin in human bodies was not as good as has been expected. Bleedings still remained when it is used in large doses.

虽然尿激酶原具有一定的纤维蛋白选择性，在实验动物体内具有较高的血栓特异性，但在人体内的纤维蛋白选择性却不如预期的那样好，大剂量使用时仍有出血的危险。

This Sm-catalyzed reaction firstly efficiently realized the catalytic cycle in the tandem rearrangement/reduction reaction of α-hydroxy epoxides, and moreover the diastereoselective amplification could be distinctly observed when two C1 epimers in substrate were subjected to this catalytic tandem reaction.

该催化的多功能串联反应，高度非对映选择性地一步控制了含有季碳的三个相邻立体中心，有效地构建了&2-季碳1，3-二醇&结构单元，首次实现了此类重排—还原过程的催化循环，其中对于两个C1位的差向异构体底物，此反应具有明显的非对映选择性放大特点。

Though enantioslectivity in the epoxidation of some substrates with soluble polymer-supported tartrates is a little lower than that with solution-phase tartrates, it is higher than enantioslectivity with insoluble polystyrene resin-supported tartrates, linear poly s and corrosslinked poly s. It is obvious that soluble polymer-supported tartrates have good catalytic activity and enantioselectivity.

尽管可溶性聚合物支载的酒石酸酯在某些底物环氧化中的对映选择性比小分子酒石酸酯低一些，但明显优于文献报道的不溶性聚苯乙烯树脂支载的酒石酸酯、线形聚酒石酸酯和交联聚酒石酸酯配体，显示了良好的催化活性和对映选择性。

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。

Compared to the conventional interleaving SLM, this short-span interleaving SLM results in a very short time delay, requires very few register units for buffering, and can be easily implemented by hardware.

与传统的基于交织的选择性映射方案相比较，这种基于短跨度交织的选择性映射方案产生非常短的时间延迟，只需要很少的缓冲寄存器，且易于用硬件实现。

This article analyzed characteristics and development trend of FCC gasoline in China, introduced the characters and plant effects of OCT-M and FRS FCC gasoline selective hydrodesulfurization process, especially the commercial application effect of the production of States Ⅲ and Ⅳ regulation gasoline. The commercial test results showed that OCT-M and FRS process were mature and credible, and had the characteristics of low pressure, low investment, convenient operation, low H2 consumption and high liquid yield. OCT-M and FRS process could offer refineries optional economical and flexible measure to produce States Ⅲ and Ⅳ regulation clean gasoline.

分析了我国FCC汽油的特点及发展趋势，介绍了OCT-M和FRS FCC汽油选择性加氢脱硫技术特点及中试效果，着重介绍了OCT-M和FRS FCC汽油选择性加氢脱硫技术生产国Ⅲ、国Ⅳ汽油的的工业应用效果，标定结果标明，OCT-M和FRS技术成熟可靠，具有装置压力等级低、投资省、操作方便、氢耗低、汽油产品收率高等特点，是我国炼厂生产国Ⅲ、国Ⅳ清洁汽油时可供选择的经济、灵活的解决方案。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷