环乙烯

In Chapter 2, the study on PET of the donor/acceptor pair via the rigid bridge, heptacyclo [6.6.0.02,6.03,13.04,11.05,9.010,14] tetradecane, is presented. By using the GMH method, the electronic coupling matrix elements between ground and excited states are predicted.

在第二章，我们研究了对七环十四烷连接儿茶酚和二氰基乙烯构建的分子内光诱导电子转移体系；考察了吸收光谱随溶剂极性变化的影响，预测了该体系的电子转移机理，并利用广义的Mulliken-Hush公式，计算了基态和各激发态之间的电子转移耦合矩阵元。

Once the hernia defects are visualized, a polypropylene or expanded polytetrafluoroethylene biomaterial is then inserted and secured to the transversalis fascia and/or Cooper's ligament with tacks or staples. The material is of a size that completely covers the myopectineal orifice.

一旦缺损区出现于视野中，送入聚丙烯或可延伸聚四氟乙烯网状补片，并将其固定于腹横筋膜上和/或Cooper韧带上，补片的大小以完全覆盖住内环口为宜。

The first step was to synthesize imidazoline. The mole ratio of oleic acid and diethylene triamine was 1:1.2, the xylene was 30%. Temperature was controlled in about 160 ℃ on this stage, timing for acylation reaction was about 1.5 hours.

第一步咪唑啉的合成：油酸和二乙烯三胺摩尔比为1：1.2，以二甲苯为携水剂，反应温度控制在160℃酰化反应1.5小时，然后升温至220℃环化反应，反应时间6.5小时。

Hydroxy-N,N-bis(2-aminoethyl)ethylamine was synthesized by addition alkylation of diethyl triamine with epoxyethane for the first time.

以二乙烯三胺和环氧乙烷为原料，通过加成烷化反应一步合成标题化合物，经多种谱学手段表征确证。

Firstly the mid-pruduct imidazoline was produced by reaction of naphthenic acid and diethylene triamine, then the corrosion inhibitor amphoteric imidazoline, which is soluble in water, was produced by reaction of imidazoline and sodium monochloroacetate in aqueous solution.

以高纯环烷酸与二乙烯三胺反应合成了中间体咪唑啉，再以去离子水为溶剂，用氯乙酸钠对该中间体进行两性化，制得了水溶性两性咪唑啉缓蚀剂。

Due to the hemilability of the heteroaromatic functionalized cyclopentadienyl ligand, these complexes showed considerable activity and high selectivity for ethylene trimerization to 1-hexene.

由于这类芳香杂环-茂配体具有Hemilabile特性，因此，此类络合物显示了一定的乙烯三聚活性和高的三聚选择性。

It is a braided packing made of Kevlar yarns impregnated with P.T.F.E.dispersion and treated with lubricant,This packing can bear hither-pressure applications than other typees of braided packings ,Due to its steel-lide strength,this yarn can be employed separately or as back-up rings with other types of packing.

TW-203芳纶纤维盘根：它是同Kevlar纤维经浸渍四氟乙烯乳液及用润滑剂，处理再编织而的盘根，这种盘根比其它各种编织盘根能承担更高的介质压力，由于这种线像钢丝一样强，它可和其它种类盘根分隔安装或作为端面环。

The first part of this study is focused on the synthesis and electro-optical properties and of poly(2,3-diphenyl-1,4-phenylene vinylene) containing polyethylene oxide side chains. The formation meso-structure nanocomposites by sol-gel process with tetraethyl ortho-silicate was demonstrated .

第一部份为聚-(2，3-双苯基-1，4-仲苯基乙烯)侧链接上聚环氧乙烷之合成、光电性质研究及透过溶胶-凝胶制程研究其自组装之奈米复合材料。

Conductivity of Polyoxyethylene/Poly (2-vinyl pyridine)Blend and Compatibilizing Effect of Lithium Perchlorate;2. Graft terpolymerization of polyoxyethylene macromer with acrylates;3. Then multiblock copolymers was obtained by condensing polyoxyethylene and poly(2 vinylpyridine)with dichloromethane in the presence of potassium hydroxide.

甲基萘锂作为引发剂利用阴离子聚合得到 2 乙烯基吡啶的遥爪双羟基低聚物(P2VP)，然后以二氯甲烷作偶联剂与聚环氧乙烷反应制备P2VP和PEO多嵌段共聚物，考察了反应时间对偶联反应的影响，并对共聚物进行了IR和1H NMR表征，由1H NMR谱的积分曲线得到了共聚物中PEO链段质量分数。

Chlorine atoms were selectively introduced into the chlorin ring based on different reactivity between vinyl group at 3-position and 20-meso position by electrophilic addition and electrophilic substitution using hydrogen peroxide/hydrochloric acid, N-chlorosuccinimide, hydrogen chloride (or concentrated hydrochloric acid) as chlorinating reagent.

以过氧化氢/盐酸、N-氯代丁二酰亚胺、氯化氢为氯化剂，根据3-乙烯基和20-meso-位的不同化学反应活性，通过亲电加成和亲电取代反应，在二氢卟吩环上选择性地引进氯原子，完成8种未见报道的具有叶绿素-a基本碳架的氯代二氢卟吩衍生物的合成。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。