电子偶

The present calculations demonstrate that O－ associates quickly with C2H4 to form ion-induced dipole complex, which can subsequently isomerize and decompose to various products, corresponding to molecular anions dissociation and associative electron detachment pathways, respectively.

计算结果表明， O－与C2H4经碰撞快速复合形成离子诱导偶极络合物中间体，然后经历异构化、解离生成各种产物，分别对应分子离子异构解离与复合电子剥离反应通道。

The present calculations demonstrate that O(superscript -) associates quickly with C2H4 to form ion-induced dipole complex, which can subsequently isomerize and decompose to various products, corresponding to molecular anions dissociation and associative electron detachment pathways, respectively.

计算结果表明，O与C2H4经碰撞决速复合形成离子诱导偶极络合物中间体，然后经历异构化、解离生成各种产物，分别对应分子离子异构解离与复合电子剥离反应通道。

In the presence of catalytic rhodium acetate, ethyl 2-diazo-3-oxo-per fluoroalkanoates, reacted readily with nitriles to give a series of 5-fluoroalkyl substituted 1, 3oxazoles with high regio-selectivity through a metal carbenoid intermediate. The reactions of carbenoids with noncyclic vinyl ethers or cyclic vinyl ethers afforded dihydrofuroates in good to excellent yields. Interestingly, only vinyl C-H insertion compound was obtained concerning of the reaction of carbenoids with 2, 5dimethylfuran due to the steric hindrance of methyl group

醋酸铑分解2-重氮-3-氧代-全氟羧酸乙酯形成的金属卡宾作为1，3-偶极体，可以与一系列芳基或烷基取代的腈反应，高度区域选择性地生成一系列4-乙氧羰基-5-氟烷基取代的噁唑化合物；也可以与富电子的链状和环状的烯基醚反应，以优良的产率得到一系列氟烷基取代的二氢呋喃类化合物；而与2，5-二甲基呋喃的反应，由于甲基的位阻作用，只得到金属卡宾对呋喃3-位烯基碳氢键插入产物。

Atoms can develop a momentary nonsymmetrical electron distribu- tion that produces a temporary dipolar arrangement of charge.

原子可以制定一个瞬间非对称电子分布，产生一个临时偶极安排收费。

In this dissertation, electrophilic reactions of Nitrosonium with imines, aza-Diels-Alder reactions of N-arylimines with a variety of electron rich olefinic compounds induced by NO~+, and photoreactions of N-nitrosodiphenylamine with aromatic amines were studied.

本文研究了：(1)NO~+与亚胺双健发生的亲电反应；(2)NO~+引发的芳香亚胺和富电子碳碳双键作为亲二烯体的氮杂Diels-Alder反应，高选择性地得到了一系列四氢喹啉的衍生物；(3)N—亚硝基二苯胺与芳香胺发生光化学反应得到了一系列偶氮苯类化合物。

Dissimilatory Fe oxide reduction under anaerobic condition is a process which is an anaerobic respiration with Fe as the terminal electron acceptor. This anaerobic respiration showed important environmental significances. Dissimilatory Fe reducers can use diverse electron acceptors including many toxic heavy metals and metalloids such as Mn、Cr、Co insides Fe. So these toxic metals were detoxified or were immobilized reductively.

这种厌氧呼吸作用具有重要的环境学和地学意义，Fe还原微生物可利用除Fe以外的许多其它电子受体包括许多有毒重金属和类金属，如Mn、Cr、Co等，从而对这些有毒重金属起到还原解毒或还原固定的作用；还原过程还可促进一些有机污染物的降解； Fe氧化物的还原偶联着Si、P等元素的变化，对提高这些营养元素的有效性发挥着重要作用。

Results showed that the new type rhodanine ramifications were good performance fluorescence reagents to determine the trace matter by fluorescence analysis.

同时，通过对上述试剂在测定铁、钴、铜、锡和锑时的条件的变化的研究，对这类试剂的分子结构和荧光性能的内在关系作了简要的探讨，讨论了供、吸电子基团对胂酸基偶氮若丹宁类衍生物荧光分析性能的影响。

The relationship between the molecular structure and fluorescence performance of reagents was discussed in brief, and the influence of the electron-supplying and electron-withdrawing groups to the fluorescence performance of carboxylphenylazo rhodanine ramifications was also studied.

简要探讨了分子结构与荧光性能的关系，讨论了供、吸电子基团对羧酸基偶氮若丹宁类衍生物荧光分析性能的影响。

With these versatile catalyst systems, electronically and sterically diverse reactants can be efficiently cross-coupled, without the need for substrate-specific optimization of reaction conditions.

凭借这些&神通广大&的催化剂系统，那些电子云和空间位阻各不相同的反应物都能有效地实现交叉偶联，无需针对底物对反应条件优化。

Addition of an uncoupler leads to an increased rate of electron transfer.

加入解偶联剂，导致电子传递速率增加

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐