查询词典 elasticity of substitution

The synthesis rst involves the nucleophilic substitution reaction of tosylates 1a– 1c with 2,3-dicyanohydroquinone (2) to afford the disubstituted phthalonitriles 3a–3c.

综合第一涉及的亲核取代反应tosylates 1A至 1C号与2，3 - dicyanohydroquinone （ 2 ）负担取代 phthalonitriles 3A条- 3C飞机。

The studied results show that feather-like hardystonite crystallizes in R2O-CaO-ZnO-Al2O3-SiO2, systems and the macrocrystalline of it will be gotten in the low concentrations of SiO2 and Al2O3, It is evident that the tendency towards the crystallizing of Hardystonite decreases with the equimolecular substitution of K2O by Na2O when the .

本文通过大量的配方实验和OM、XRD分析，系统研究了R2O－ CaO－ ZnO－ Al2O3－SiO2系统锌黄长石析晶与组成和热处理温度间的相互关系。

Then sodium ethoxide was used as base,the nucleophilic substitution of 2-pyrrolidone with the intermediate provided nefiracetam.

以碳酸钠为缚酸剂，摩尔比为1︰1的2，6-二甲基苯胺与氯乙酰氯反应合成了中间体2-氯-N-(2，6-二甲基苯基)乙酰胺；在强碱乙醇钠作用下，2-吡咯烷酮再与2-氯-N-(2，6-二甲基苯基)乙酰胺经亲核取代合成了目标化合物奈非西坦。

Chapter 2 elaborates two international leading theories on FDI and foreign trade development, namely, trade and investment substitution theory of Mundell and trade and investment supplement theory of Kojima Kiyoshi. Moreover, the theories are extendedly applied in the field of introduction of FDI and foreign trade development in the developing countries, and a brief estimation is made.

第二章详细考察了国际上关于外商直接投资和对外贸易发展的两个主要理论，即蒙代尔的贸易与投资替代论和小岛清的贸易和投资互补论，进而将其扩展应用到发展中国家引进FDI与对外贸易发展领域，并进行了简要的评价。

It makes an all-round research, analysis and study to it with the extinctive theory, planning demand and systemic conservation of FM-200, including the design for automatic alarm systems and some essential claim for safety decentralization and the economy budget for the whole complete the design of this substitution.

本文根据深圳高阳万国电脑有限公司通讯楼的具体工程概况，采用全淹没式七氟丙烷（FM-200）灭火系统对其进行保护，同时对目前哈龙灭火系统替代产品的灭火性能、使用场所及对环境与人身安全影响进行了分析，对七氟丙烷（FM-200）气体灭火系统的灭火机理、设计要求以及系统维护进行了全面的调查、分析与研究，包括自动报警系统的设计和一些必要的安全疏散要求以及对系统的经济预算，完成了本文设计。

As an operation for trial, exploration and technology used by the ancients, with the principle of mystery and fantasticism, alchemy surprisingly at last became the substitution of deceiving.

它作为古人的一种试验、探索、技术操作，循着神秘而荒诞的思路，却成了行骗的代名词。

Four new salicylaldehyde derivatives with a glucose or mannose moiety were synthesized with 2-tert-butylphenol or 4-tert-butylphenol as the starting material, followed by the formylation, chloromethylation, nucleophilic substitution reaction with the desired carbohydrate. The salicylaldehyde derivatives condensed with ethylenediamine to give the Schiff bases, which coordinated with Mn to afford four novel sugar-based Salen Mn complexes.

首先，分别以2-叔丁基苯酚和4-叔丁基苯酚为起始原料，经过甲酰化反应、氯甲基化反应、和糖类衍生物的亲核取代反应制得了四种新型并入葡萄糖基或甘露糖基的水杨醛衍生物，将它们与乙二胺缩合生成希夫碱配体，得到的配体与过渡金属Mn~(3+)配位制备出四种新型含糖基的Salen Mn配合物。

In this paper the errors in formula (2) are detected by analysis made on the principle of area substitution,and methods for reducing errors is presented which are capable of a higher degree of accuracy in maximum proximation for Gaussian distribu- tion and fractile formula.

从而得到精度很高的 Gauss 分布函数极大迫近式和分位数公式，并指出精确度明显优于 Hastings 和 Shannelerlan 公式。

The divergence time between C.amherstiae and C.pictus was at least 1.7My based on the substitution rate of nucleotide acid of cytothrome-b gene in Galliformes.

根据鸡形目细胞色素b基因核苷酸替换的速率约为每百万年0.5％～ 0.7％，推断出两种锦鸡的分化时间至少为1.7百万年。

Four chlorite geothermometers, which are universally applied, are introduced and compared in this paper. Main effort has been devoted to discussing the necessity of Fe/ adjustment on chlorite geothermometer by reviewing ion substitution vectors and by comparing calculation errors.

介绍了四种应用最为广泛的绿泥石成分温度计的原理，并从离子替代规律和比较研究的角度着重讨论了近年来关于绿泥石成分温度计校正的必要性。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。