极性

The hydrophobic value of Fuchs\' model of humic acidsand Alvarez\'s model of fulvic acids which combined with metal icon smaller than the other molecularmodels; but the refractiveness, polarity, approximate surface, grid surface, volume, mass of the Felbeck\'smodel k of the humic acids and Buffle\'s model of the fulvic acids which interacted with the metal iconsmaller than the other molecular models.

综合比较结果表明：Fuchs—HA和Alvarez—FA与金属离子结合物的疏水性小于其他它腐殖酸分子；Felbeck-HA和Buffle—FA与金属离子结合物的折射性、极性、近似表面积、栅格表面积、体积、质量同比小于其它腐殖酸分子。

In the dilution of the solvents, additional polar solvent such as butanone, isopropyl alcohol, ethanol, and so on to ethhyl.

在不浓缩的溶剂洋，补增极性溶剂，如丁酮、异丙醇、乙醇等，多用乙酯。

In addition, we have also measured the contact angle that stilled water contact with powder-graphite with the capillary rise method based on Washburn's equation.

石墨粉末表面色散自由能为21.8mJ.m-2，极性自由能为1.8mJ.m-2，总的表面自由能约为23.6mJ.m-2，以色散自由能为主。这是去离子水能够湿润石墨粉末，但湿润性相对较差的一个原因。

The effects of the length of alkyl-chain,the polar group and the number of carboxyl group on rust-inhibiting properties and solubility were investigated in systematically.

合成并研究了水溶性有机羧酸醇铵盐类防锈剂，系统地考察了烷链的长度、极性基团、羧基的个数对防锈性能和溶解度的影响。

The essential oil from Cinnamomum cassia Presl was studied by non-polar solvent microwave-assisted extraction coupled with gas chromatagraphy-mass spectrometry.

利用非极性溶剂微波辅助提取-气相色谱质谱联用研究了肉桂中的挥发油成分，并测定了挥发油中的主要成分肉桂醛的含量。

The increase of distribution ratio may be conduced by the nonpolar group in branch chain of amino acid.

氨基酸的支链结构中含有非极性基团将导致其分配系数的增加。

The results indicate that improving temperature to reflux, using low polarity solvent as dispersion medium and proper molar ratio of tetrabutyl titanate to stearic acid can bring out good modification. The function of tetrabutyl titanate is to react with the surface hydroxyl groups and adsorbed H2O on the powder particles to produce new binding sites such as M—O—Ti—OC4H9and M—O—Ti—OH, which can easily react with the carboxylic acid. As temperature increases from room temperature to reflux temperature, the reactions between RCOO- and Ti change from coordinate bonds to covalent bonds, which makes the carbon chains of stearic acids more strongly bound with the powder particles surface.

研究结果表明，提高处理温度、适当增加复合改性剂中硬脂酸的量并选用极性弱的有机溶剂可达到比较理想的改性效果；钛酸四丁酯的作用是与粉体粒子表面的羟基以及吸附水反应产生偶联点，如M—O—Ti—OH，这些偶联点易于与羧酸反应；在低温时RCOO-与偶联点的Ti之间以配合物的形式发生作用，在回流温度下处理时，主要发生酯化反应，使硬脂酸更牢固地嫁接到粉体粒子表面，改性效果更好。

Visco-elasticity of micro-polar fluid is characterized by two parameters of coupling number and molecular characteristic length.

微极性流体的粘弹特性由耦合数和分子特征长度两个参数决定。

The results showed that (1) Surface charge density of apoptotic cell of electret group was significantly reduced as compared with those of control group.

结果显示：（1）负极性驻极体作用3T3细胞能减少凋亡细胞的表面电荷密度。

Negative electret can improve cell growth and increase cell surface charge density.

负极性驻极体具有促进成纤维细胞生长和增加细胞表面负电荷量的作用。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐