查询词典 Lewis base

After the failure of achieving good enatioselectivity in asymmetric Baylis-Hillman reaction, we turned our attention to traditional chiral Lewis base catalyzed asymmetric Baylis-Hillman reaction.

我们还发现，用咪唑与-脯氨酸共催化醛和丁烯酮的Baylis-Hillman反应，但产物的e.e值还是很低，因此又回到了传统的用手性Lewis碱催化不对称Baylis-Hillman反应研究中。

The result indicates that the big π bond of benzene not only turns benzene into a Lewis base,but also makes it to undergo electrophilic substitution (halogenation,nitration,sulfonation and so on),rather than addition

结果表明，苯的环状大π键结构不仅使苯成为1个Lewis碱，而且使苯容易发生卤代、硝化、磺化等亲电取代反应，但不易发生加成反应。

His predecessor, Kenneth Lewis, typically received a base salary of $1.5 million.

莫尼汉的工资为95万美元。其前任肯尼思。

Isobutane can be chemisorbed on surface terminal oxygen of Lewis base sites M=O bonds by one or two H atoms in-CH〓.

异丁烷分子以CH〓中C-H键的H端单位或双位吸附于催化剂表面Lewis碱M=O双键的端氧位。

The well-funded companies, first-class technology, scale of operation, as in recent years, the good trend of stable development, Shenzhen now has Adar Shenzhen, two production base in Hunan Province, covers an area of 2000 square meters, more than 200 employees, formed a Production base in Hunan conventional products, the production base in Shenzhen high-end production pattern.

本公司资金雄厚，技术一流，规模经营，随着近年的良好稳定的发展态势，深圳亚达现已拥有深圳，湖南两个生产基地，占地面积2000余平方米，员工200余名，形成了以湖南基地生产常规产品，深圳基地生产高端产品的生产格局。

A data gathering scheme MADG(movement-assisted data gathering),which makes use of the mobile base station for data collection,is presented.In this scheme,the base station moves in a stationary annularity area exploited for data buffering.The gathered data.are firstly forwarded into the buffering area and then collected by the mobile base station.

提出了一个利用移动基站协助数据收集的模式(movement-assisted data gathering，简称MADG)，它将基站移动区域设置为缓冲区，首先将数据沿最短路径传输到缓冲区内，然后在基站移动的过程中进行数据收集。

In this paper, three types of image data base is proposed, that is, attribute-oriented, feature-oriented and knowledge-oriented; the public fundamental structure of image data base system in each field is implemented, the improved expression of image geometrical feature is given, the strong command language and necessary auxiliary means to manage image data base are designed.

文中提出了图象数据库的3种类型，即面向属性型、面向特征型和面向知识型；实现了各领域上的图象数据库系统共有的基本结构；给出了一种改进的用于表示图象几何特征的方法；设计了一种具有较强功能的命令语言和管理图象数据库所必要的辅助手段。

Base Load Base load is that portion of a building load demand which is constant. It is the "base" of the building demand curve.

基本负荷基本负荷是指建筑负荷需求量中不变的那一部分，是构成负荷需求曲线的基数。

IPCOP . Base Load Base load is that portion of a building load demand which is constant. It is the "base" of the building demand curve.

基本负荷基本负荷是指建筑负荷需求量中不变的那一部分，是构成负荷需求曲线的基数。

In mould base register file "mouldbase_-reg_mm.xls", pattern recognition technique was used, to find what type of mould base components are most suitable for different specific criteria's (for instance DME metrical mould base components).

在模具基本数据登记档案"mouldbase_-reg_mm.xls"中，应用了模式识别技术，用以帮助识别何种模具基本数据最适合于特定的标准（例如，DME公制模具基本数据母材成分）。

It was just a normal day of school

那只是上学的普通一天

Which is a very good reference in this issue.

这是一个在这个问题上很好的参考。