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The author comes to some conclusions as follow: The Khanate of Kipchak kept the submissive relation to the house of the grand khan and supported the supreme khan of Mongol Empire in the inner politics and the policy to the outside, which gave certain supports to the early communication in the Mongol Yuan dynasty; The Khanate of Kipchak should account for the stop of the communication caused by the foundation of the Khanate of Ogotai which had been supported by the Khanate of Kipchak during the period of the reign from Berke to Mangu Timur; The short-time stop of the communication was also Mongolian central government"s tragedy. The relationships of the Khanate of Kipchak to Yuan dynasty began to become normal during the course of the reign of Tuda Mangu ,Tula-buqa and Toqatai khan, in which the Khanate of Kipchak gave certain devotions to "peace" of the Mongol Khanates. Their relations had been best after the separation of Mongol Empire during the time of ozbeg and Janibeg"s reign which was. the rush hour of our economic and cultural intercourses with the Khanate of Kipchak and other west countries. The development of the relationships to Egypt accelerated the intercourses between this two countries, which indirectly widened the ways of the Sino-Arab communication in the economy and cultures. The relations to Ire Khanate had been very bad for a long time. This stopped the convergence of the Steppe Silk Roads and the Oasis Silk Roads. In other side, this helped the intercourses between Ire Khanate and Christian Europe.

本文认为，蒙古帝国时期，无论在内政还是外交方面，钦察汗国都维护着蒙古大汗的权威，保持着与蒙古大汗廷的臣属关系，这为蒙元早期中西经济文化交流需要的条件做出了一定贡献；别儿哥至忙哥帖木儿统治时期，钦察汗国应对因窝阔台汗国的崛起而导致的中西交通的阻断负一定责任，但这同时也是蒙古中央政府的悲哀；脱脱蒙哥至脱脱统治时期，两国关系开始逐渐恢复，钦察汗国为蒙古诸汗国的&约和&贡献了自己的力量；月即别和札尼别统治时期是两国关系的最密切时期，也是双方经济文化交流和中西交通的高峰期；钦察汗国与埃及关系的发展，一定程度地拓宽了中阿经济文化交流的渠道；钦察汗国与伊利汗国关系恶化和长期的紧张，一方面阻碍了草原丝路与绿洲丝路的交汇，另一方面促进了伊利汗国与欧洲的经济文化交流。

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2008年3月至6月，Z和C从来没有松懈过对www.176pet.com的关注和更新，不提倡过度的SEO，但如何把握好度是一件非常困难的事情，过度优化，肯定是会被搜索引擎所排斥的，很多人说我的站又被百度K了，也许就是你没能把握好度，也许是你违反了搜索引擎的某些收录规则，建议多看看站长网(www.admin5.com)，多看看搜索引擎收录指南，适当的优化，是有必要的，究竟白手起家，草根们都没有太多的资本去做闻名网站的宣传，去百度、google、yahoo做要害字排名，而新站要站稳脚跟，能友好的和各大搜索引擎搞好这种微妙的关系也是至关重要的。

Methods Activate groups A and C meningococcal polysaccharide with cyanogens bromide and prepare into MenAPS-ADH and MenCPS-ADH derivatives by reacting with 1, 6-adipic acid dihydrazine. Mix MenAPS-ADH and MenCPS-ADH derivatives with purified tetanus toxoid at a certain mass ratio, then add l-ethyl-3(3-dimethylaminopropyl)-carbodiimide to prepare bulks of MenAPS-TT and MenCPS-TT conjugates respectively. Mix the two bulks at a certain ratio, add stabilizer and lyophilize to prepare group A+C meningococcal polysaccharide conjugate vaccine.

A群和C群脑膜炎球菌多糖在溴化氰的活化下，以1，6己二酰肼作为连接子，与精制破伤风类毒素在碳二亚胺作用下结合，再按一定的比例将两者混合，制成A+C群脑膜炎球菌多糖结合疫苗原液，加保护剂冻干后，制成A+C群脑膜炎球菌多糖结合疫苗。

Firstly,based on the B.Bowermans result about the rate of convergence in Cesaro sense of certain nonhomogeneous Markov chains which the transition matrices converge,we are to study a certain nonhomogenous Markov chains which the transition matrices average converge to a period strongly ergodic stochastic matrice,and control the average convergenc rate of transition matrices,then we get the rate of convergence in Cesaro sense about the nonhomogeneous Markov chains by used the character of norm and the character of nonhomogeneous Markov chains.It is an extension of a B.

首先在B.Bowerman等人研究转移矩阵列收敛的一类非齐次马氏链，其Cesaro平均收敛的收敛速度基础上，研究转移矩阵列平均收敛到一周期强遍历随机矩阵的一类非齐次马氏链，通过控制转移矩阵列平均收敛的收敛速度，利用矩阵范数的性质、非齐次马氏链的相关性质等，得到该非齐次马氏链转移矩阵Cesaro平均收敛的收敛速度，是B。

Searching for specific ligand to a certain recepter or enzyme in human body from secondary metabolities of plants, animals and microorganisms, Optimization of lead compound under certain theory or hypothesis, and synthesis methodology investigation of pharmaceutically active compound are all tasks of medicinal chemistry.

药物化学的研究领域十分宽广，既有从动物、植物、微生物的次生代谢产物中寻找与人体内特异性的受体、酶的激动剂或拮抗剂，又有在理论、假想指导下的先导化合物的优化，以及生理活性化合物的合成方法学研究。

The biological tests indicate that most of the compounds synthesized have herbicidal activity in a certain degree and several compounds show certain bactericidal activity. Further anti-ALS enzyme test shows that two kinds of novel phosphonic ureas have good anti-ALS enzyme activity.

对合成的部分化合物进行了初步的生物活性测定，所设计的大部分化合物都显示出一定的除草活性，有的具有一定的杀菌活性；对两类膦酰脲化合物进行了离体ALS酶抑制试验，结果表明它们是很好的ALS酶抑制剂，同磺酰脲相当，有希望作为另一类ALS酶抑制剂的先导化合物。

But, even if one tries to think in a physicalistic manner, one cannot avoid thinking that, at a certain level of complexity, there emerges something which is neither a matter of seeing or interpreting the organism in a certain way from outside nor is it just one of those levels of complexity which one might notice or ignore.

但是，即使一个人试图按物理主义者的方式去看事物，也不能避免去认为：在特定的复杂水平上，它们涌现出了什么东西，而这不是按某种从外部的方式去看或去解释机制而能看到或解释得到的东西，也不是那种其复杂水平是可以注意或忽略的东西。

The goal of Piotr Chizinski's work is to make the viewer comfortable enough with certain information to utilize principles of logic and reason to evaluate the validity of certain ideas and prejudices.

彼得亚雷的作品旨在以特定的信息令观众感到安慰，并运用逻辑推理的准则衡量某些观念和偏见的效应。

Aluminum polychloride easily available from market and CAT reacted at certain temperature for certain time and a complex coagulant was then attained.

以市场上可购得的聚铝为另外一种原料，通过PAC与CAT复配反应制得一种新型絮凝剂：阳离子单宁-聚铝复合絮凝剂。

A stable, water-insoluable film was prepared by oxidative electropolymerization of pyrogallol in pH7.0 phosphate buffer solution, anti modified on a glassy carbon electrode surface by electrochemical method. The modified electrode was exploited for the selective preconcentration of Cu at a certain potential. The preconcentrated Cu was firstly reduced at a certain potential and then was determined by differential pulse stripping voltammetry.

采用电化学方法在pH7.0磷酸缓冲溶液中，将邻苯三酚氧化电聚合制成稳定的水不溶性膜修饰在玻碳电极表面，将制得的膜修饰电极在一定电位下选择性预富集铜，并用差分脉冲溶出伏安法测定。

Bob Eckert has been chairman and chief executive of Mattel for eight years.

美泰董事长兼首席执行官鲍勃·埃克尔特在任已8年。

The outlook for honors and disgraces carries on and surpasses the traditional outlook for honors and disgraces theoretically, and carries on and develops the theory of construction of socialist mora...

社会主义荣辱观的提出在理论上是对传统荣辱观的一次继承和超越，是对社会主义道德建设理论的继承和发展，在实践上有利于形成良好的社会风尚。