查询词典 Chain Reaction

Effects of microwave power, reaction time, reaction temperature, solvent etc. on reaction were studied by a single factor tests. The results show that maleic acid is more active than fumaric acid; the introduction of methyl group on the double bond can weak the reactivity of the Michael addition reaction; the ester base is more propitious to complete the Michael addition reaction than the nitrile base.

为研究微波下迈克尔反应的规律，本文采用单模聚焦微波有机合成仪，通过对顺丁烯二酸、反丁烯二酸和氨水合成DL-天冬氨酸、顺式3-甲基丁烯二酸和氨水合成3-甲基天冬氨酸、丙烯酸甲酯和氨水合成β-丙氨酸、丙烯腈和氨水合成β-氨基丙腈等五个反应对迈克尔加成反应进行了研究。

Melting point 3410 ℃, boiling point 560 ℃, relative density of 1935, F the external electronic structure of 5d46s2, in the chemical reaction time is very easy to lose 1-6 electronic, but also can get 1-2 electronic, so oxidation number of 0,± 1,± 2, 3, 4 , 5 and 6, with 6 price of the most stable compounds, such as WO3 does not dissolve in water, the air will form in the tungsten trioxide thin protective layer of tungsten, tungsten with fluorine at room temperature, chemical combination, red hot when there is no moisture and Bromine iodide together, red hot when you can and water reaction WO3, at room temperature reaction of tungsten with aqua regia, but the hot concentrated hydrochloric acid and sulfuric acid can only be played with its weak response, but molten nitrate, nitrite, too Hydrogen peroxide, sulfur steam, steam and other phosphorus can play intense reaction, high temperature can not be carbon, boron and silicon reaction of binary compounds, widely used in industrial tungsten steel and tungsten carbide, pure tungsten filament is used to the system, and X-ray tube Tube heating components, semiconductor components can be prepared tungsten silicide, tungsten industrial production is white or black tungsten ore tungsten ore refining.

熔点3410℃，沸点560℃，相对密度1935，F外围电子结构为5d46s2，在化学反应时很容易丢掉1—6个电子，也能得到1—2个电子，所以氧化数为0、±1、±2、＋3、＋4、＋5和＋6，以＋6价化合物最稳定，如WO3不溶于水，空气中的钨会形成薄层三氧化钨保护层，钨能与氟在室温下化合，红热并无潮气时能与溴、碘化合，红热时还能和水反应生成WO3，室温下钨可与王水反应，但热的浓盐酸和硫酸只能与其起微弱反应，但对熔融的硝酸盐、亚硝酸盐、过氧化氢、硫蒸汽、磷蒸汽等能起激烈反应，高温下不能与碳、硼和硅反应生成二元化合物，工业上广泛使用钨钢和碳化钨，纯钨用来制灯丝、电子管和X射线管的发热元件，硅化钨可制半导体元件，钨工业生产是将白钨矿石或黑钨矿石精炼。

Through transformation of parameters, the meshing design system among Hy-Vo silent chain, sprocket and hob was built up based on the research of the pitch increment and the equivalent apothem increment of the effects on the common normal line length when the Hy-Vo silent chain was wrapped around and located on the sprocket, with the proper meshing conditions of Hy-Vo silent chain and sprocket into consideration. The design method of common normal line length was put forward that can be used when the value of the sprocket pressure angle was equal or unequal to the value of the Hy-Vo chain plate pressure angle.

在分析Hy-Vo齿形链链节围在链轮轮齿上定位时其节距增量和当量边心距增量对链轮公法线长度影响的基础上，根据Hy-Vo齿形链与链轮的正确啮合条件，通过参数变化，建立了Hy-Vo齿形链－链轮－滚刀三者之间的啮合设计体系，提出了既适用于链板齿形角等于链轮压力角情况，也适用于链板齿形角不等于链轮压力角情况的Hy-Vo齿形链链轮公法线长度的计算方法。

The influence of excluded volume on the size of tail-like chain is similar to that on free one, but the mean asphericity parameter of SAW chain is bigger than that of random-walking chain, and the correlation coefficients C〓 and C〓 were larger than those of RW chain.

排斥体积对尾形链尺寸的影响与自由高分子链的排斥体积效应相类似，但是自回避链的平均非球形因子的值大于无规行走链的值，且SAW链的尺寸与形状之间的关联系数的值大于相对应的RW链的值。

The soluble tetra-alkyl phthalocyanine compounds have the following general structure, wherein Rn represents straight-chain or branching chain alkane, n represents the number of straight-chain or branching chain alkane, M represents center ligand of bivalence or more, L represents axial ligand, X represents the number of L.

该可溶性四烷基酞菁化合物符合如下结构通式：结构通式中，Rn代表直链或支化链的烷烃，n代表直链或支化链的烷烃的数目，M代表二价或二价以上的中心配体，L代表轴向配体，X代表L的数目。

In the global integration of the environment, some simple supply chain also for the development of the global supply chain, leading to increasing supply chain and more complex, supply chain management on the request to change with it.

在全球一体化的大环境下，一些简单的供应链也发展为全球供应链，导致供应链越来越长且越来越复杂，对供应链管理的要求也就随着改变。

Starting from the necessity of constructing rational supply chain structure,conceptions of supply chain structure flexibility are expatiated.Then the connection between the supply chain structure flexibility and knowledge coupling among them are analyzed.On the basis of that,it constructs the model of knowledge coupling in the supply chain,and proposes supply...

从构建合理的供应链结构对供应链有效运作的必要性出发，首先阐述了供应链结构柔性的相关概念，接着分析了在知识经济时代，供应链结构柔性与成员间的知识联结关系，在此基础上，构建了供应链的知识联结关系模型，并从关系模型出发，提出了通过综合考虑知识联结范围和知识联结强度这两个知识联结的维度，来测度基于知识联结的供应链结构柔性，并通过实例说明模型的应用。

It described the basic conception of quality chain\chain node\chain note chart and coupling effect, and improved the material transfers process of Gemalto Multinational Corporations manufacture center in China by using DMAIC and other methods of project management, and also practice the basic way and thought of 6Sigma by using material transfers management of the quality chain.

介绍了质量链这一思想发展的历史演变，简要阐述了质量流、质量链、链节点、链节图、耦合效应等基本概念，并选取质量链中物流管理这一重要环节，结合六西格码管理的基本方法和思路，运用DMAIC的方法以及借鉴了项目管理的方法，对Gemalto跨国集团在中国湖南的制造中心物流流程进行了系统的改造。

The paper introduces the"bullwhip effect"of a supply chain and the application of software Witness, and discusses the simulation of software Witness in the supply chain system. The structure of supply chain in the paper is composed by steel company, steel service center, parts manufactures and car factories. The lead-time of order and the time of transportation in each stage and of whole chain are the main performance index at present research stage.

文章介绍了供应链中的"牛鞭效应"以及Witness的基本应用，讨论了在供应链系统中利用Witness软件进行仿真的方法，采用了由钢铁公司、钢材服务中心、部件生产商和汽车厂所组成的供应链结构进行仿真，整个供应链和供应链上各节点的订货提前期和运输时间是所介绍的模型中的主要供应链绩效指标。

This paper gives analysis to the character of logistics in supply chain environment and the transformation of supply chain management, regarding procuring management as a key in supply chain management. The process to achieve the procuring management goal is the process to improve the efficiency of supply chain and lower it's operational cost.

本文分析了供应链环境下物流特点和供应链管理模式的转变，认为采购管理在供应链管理中占据着重要地位，采购管理目标的实现过程也是提高供应链效率，降低供应链运营成本的过程。

There had been a moment during the breakfast meeting, though, after the backslapping and the small talk and when all of us were seated, with Vice President Cheney eating his eggs Benedict impassively and Karl Rove at the far end of the table discreetly checking his BlackBerry, that I witnessed a different side of the man.

那次早餐会期间，在表示过关心和寒暄以后，我们所有人坐了下来，我注意观察了一下，副总统切尼面无表情地吃着班尼迪克蛋（Eggs benedict，源自美国，以英式松饼、火腿、水煮蛋以及荷兰酱组合而成），卡尔。罗夫在餐桌的远端谨慎地经常查看他的黑莓手机，我目睹了他所不为人知的一面。

Talk Undelete failed; someone else may have undeleted the page first.

Talk 无法删除选定的页面或图像（它可能已经被其他人删除了）。