四元的

By studying the membrane preparation process for the typical membrane materials of polystyrene and cellulose acetate as well as a new type membrane material of polyvinyl butyral,the effects of operating parameters on the membranes structure are determined.By the study on the thermodynamics involved in the ternary systerms of ScCO_2/solvent/polymer and the calculation of theoretical ternary phase diagrams,the phase demixing behavior during the membranes formation by ScCO_2 induced phase separation process are described.By studying thermodynamics involved in the quaternary systerms of ScCO_2/solvent/additive/polymer,the effect of a low molecular weight additive on the quaternary phase diagram and dimixing speed are revealed.

通过对传统膜材料聚苯乙烯、醋酸纤维素及新型膜材料聚乙烯醇缩丁醛进行ScCO_2诱导相转化制膜工艺的实验研究，给出了操作参数对膜形态结构的影响规律；通过研究ScCO_2/溶剂/聚合物三元体系热力学问题，并计算出相应铸膜体系的三元相图，对ScCO_2诱导相转化膜制备过程的分相成膜行为进行了分析与描述；通过研究ScCO_2/溶剂/小分子添加剂/聚合物四元铸膜体系的热力学问题，并借助于四元体系理论相图计算的结果，分析了小分子添加剂对相分离过程的影响。

Based on the molecular structures, sugar alcohols can be classified into Mono sugar alcohol (such as erythritol, xylitol, sorbitol and mannitol ) and Disaccharide alcohol (such as maltitol,lactitol and isomaltitol).

糖醇是醛糖或酮糖的羰基经氢化还原成羟基的多元醇；按其结构可分为单糖醇(如四元赤藓糖醇、五元木糖醇、六元山梨糖醇和甘露糖醇)，双糖醇(如麦芽糖醇、乳糖醇、异麦芽酮糖醇)。

Structure Design and Modification of Mannitol-polylactide Tissue Engineering Materials;2. Based on the molecular structures, sugar alcohols can be classified into Mono sugar alcohol (such as erythritol, xylitol, sorbitol and mannitol ) and Disaccharide alcohol (such as maltitol,lactitol and isomaltitol).

糖醇是醛糖或酮糖的羰基经氢化还原成羟基的多元醇；按其结构可分为单糖醇(如四元赤藓糖醇、五元木糖醇、六元山梨糖醇和甘露糖醇)，双糖醇(如麦芽糖醇、乳糖醇、异麦芽酮糖醇)。

In this paper, we describe the history of Mizar system and the method to use theMizar system. Then we give the definition of quaternion numbers, module, algebrastructre etc, and then we prove its properties.

本文首先介绍了Miza(来源：ABC论文61网www.abclunwen.com)r系统的计算机操作原理和使用方法，给出了在Mizar语言系统下四元数、四元数的运算、共轭、内积、模等代数结构理论的证明，所做结论都通过了Mizar系统的验证，发表在波兰的《Formalized Mathematics》杂志上，并被收录到MML数据库中。

To 1997, surface of complete province pisciculture already amounted to labour force of fishery of 5.28 million mus of; pisciculture of masses of; of nearly 170 thousand person door amount to many 56560, production value of aquaculture of 2800 yuan of; exceeds net income of piscatorial average per capita 3.2 billion yuan, the proportion that holds agricultural total production value amounts to 7 ％, among them piscatorial total production value realizes 1.16 billion yuan (changeless 1990 price) crop of; aquatic product amounts to 323 thousand tons, came true 3 years to translate 4 struggling goal than 1980 ahead of schedule, breed crop to amount to 275 thousand tons among them.

到1997年，全省养鱼水面已达528万亩；渔业劳动力近17万人；群众养鱼户达56560多户，渔民人均纯收入 2800元；水产业产值超32亿元，占农业总产值的比重达7.0％，其中渔业总产值实现11.6亿元(1990年不变价)；水产品产量达32.3万吨，提前三年实现了比1980年翻四番的奋斗目标，其中养殖产量达27.5万吨。

Because of Its wide-ranging connection with many applied science, such as the quantum physics, geostatic, the figure and pattern recognition and the space telemetry and so forth, the research in quaternion algebra is valuabe.

四元数在众多的应用问题中存在广泛的联系，如四元数在量子力学，刚体力学方面的应用，在计算机图形图像处理和识别方面的应用，在空间定位方面的应用等。

Results Vector algebra and vector analysis are the production of quaternions and the result of seeking mathematical indication of physical phenomenon, it′s the historic certainty as well as the effect of some accidental elements.

结果现代向量系统是从四元数发展而来的，是寻找物理现象的数学表示的结果；通过对哈密顿四元数与格拉斯曼系统的对比分析指出其历史的必然性。

From the potential energy profile, it can be predicted that, the dominant channel of this reaction consists of three steps: the two reactants first form a three-membered ring intermediate (INT1) through a barrier-free exothermic reaction of 19.2 kJ/mol; three-membered ring intermediate (INT1) isomerizes to a four-membered ring silylene(P2) via the transition state (TS2) with an energy barrier of 22.8 kJ/mol; four-membered ring silylene(P2) further reacts with ethene(R2) to form a silicic bis-heterocyclic compound (P3), which is also a barrier-free exothermic reaction of 132.2 kJ/mol.

用CCSD//MP2/6-31G*方法研究了单重态二甲基亚烷基硅烯与乙烯生成硅杂双环化合物环加成反应的机理，根据该反应的势能面可以预言，该反应的主反应通道有三步组成：第一步是两反应物（R1， R2）首先生成了一三元环中间体（INT1），它是一无势垒的放热反应，放出的能量为19.2 kJ/mol；第二步是三元环中间体(INT1)经过渡态TS2异构化为了四元环硅烯（P2），其势垒为22.8 kJ/mol；第三步是四元环硅烯（P2）进一步与乙烯(R2)反应生成了硅杂双环化合物（P3），该反应也是一无势垒的放热反应，放出的能量为132.2 kJ/mol。

Among them, the first quarter of the market value of fund holdings evaporation 453.213 billion yuan, with the end of 2007 the market value of 2.400673 trillion yuan of holding 18.88 percent compared to大亏; the second quarter, holding the market value of 225.916 billion yuan evaporation, shrinking the market value of 20.24 percent margin; third quarter of the market value of evaporation of 259.503 billion yuan shares, value shrank by 20.6 percent rate; by three at the end of the shareholding and the December 16 closing price, the fund market value of 609.437 billion yuan holdings, since the fourth quarter the market value of re-evaporation of the fund holdings 679.89 billion.

其中，该基金持有的蒸发四五三二一三○○○○○○元市值第一季度，与2007年底2400673000000持有18.88亿美元，比大亏元的市场价值，第二季度，持有的225.916亿美元的市场价值人民币蒸发，减少了百分之利润20.24市场价值；有关的2595.03亿元的股票市值蒸发第三季度，价值缩减率百分之20.6；由三个股份制年底和12月16日收盘价计算，该基金市值6094.37亿元持有，第四季度以来的转口市场价值基金持股6798.90亿蒸发。

So 2 thousand yuan RMB will get you two hundred fourty-six dollars and ninety cents, minus the two-dollar currency conversion charge.

所以二千元人民币可以换成二百四十六元九十分的美元，不过要扣掉两元的手续费。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。