查询词典 activity coefficient

This research utilized the method of organic synthesis, researching different amounts and positions of hydroxy-substituted benzoic acid and serotonin into amide reaction, so as to produce a series of polyhydroxy substituted N-benzoylserotonin derivatives (compound 1-10). Accordingly, this study conducts the following four tests. I. The activity of antioxidant and the experiment of ability to scavenge DPPH free radical, II. The ability of overall antioxidant—the activity of TEAC, III. The activity test of inhibit Tyrosinase, and IV. The study of absorbing UV / VIS Spectrophotometers. This study use trolox, arbutin, and octyl salicylate as the control groups, and to test the ability of anti-oxidation, the activity of inhibit Tyrosinase, and the ability of absorbing UV. This research ultimately intends to investigate the applied value of those compounds into cosmetics.

本研究主要利用有机合成的方法，将不同数量及不同位置的羟基取代苯甲酸化合物与色洛冬宁进行醯胺化反应后，得到一系列的多羟基取代之N-色洛冬宁苯甲醯胺衍生物（化合物1 ~ 10），进行四种不同活性测试方法：一、清除DPPH自由基能力抗氧化活性测试；二、总抗氧化能力活性测试；三、抑制酪胺酸酶活性美白测试；四、紫外线／可见光光谱仪吸收测试，并以水溶性维生素E、熊果素、水杨酸辛酯当作对照组，探讨其抗氧化能力、抑制酪胺酸酶的活性能力与吸收紫外线能力，再进一步探讨其应用於化妆品上的价值。

According to this model,the equations of the ionic mean activity coefficient and the osmotic coefficient of solve...

用实验数据广泛检验结果表明，这个模型能很好地适用于较高浓度下的强电解质溶液。

The result indicates that with organic fertilizer and inorganic nitrogen fertilizer can obviously increase the leaf dimension coefficient, enhance the content of chlorophyll and soluble protein, improve the SOD activity of flag leaf, depress the content of MDA, postpone the speed of decrepitude of flag leaf,; The status with high content of chlorophyll and leaf dimension coefficient lasts longer with organic fertilizer than with inorganic nitrogen fertilizer and the flag leaf have longer functioning time; the combination of inorganic nitrogen fertilizer and organic fertilizer can substantially postpone the speed of decrepitude of winter wheat.

在国内持续时间最长的肥料长期定位（28年）试验条件下，研究了肥料持续施用下冬小麦花后叶面积系数等生理指标的变化，结果表明施用有机肥、氮肥，可明显增大小麦的叶面积系数，增加叶绿素含量和可溶性蛋白含量，提高旗叶的SOD活性，降低丙二醛的含量，延缓旗叶的衰老；施用有机肥较施用氮肥，叶绿素含量及叶面积系数持续高值时间长，旗叶有更长的功能期；长期氮肥与有机肥配施能显著延缓小麦衰老。

The reaction kinetics was studied by selecting control-step method as well as modified Debye-Hückel activity coefficient model and Bromley osmotic coefficient model. The results show that the reaction order is 2 and apparent reaction activation energy 85.8 kJ/mol, and the reaction is mainly controlled by precipitation of KB5O8?4H2O.

采用选取控制步骤法并引入修正的Debye-Hückel活度系数模型和Bromley渗透系数模型研究了该反应的动力学的影响规律，得出反应级数为2，表观反应活化能为85.8 kJ/mol，反应主要受四水五硼酸钾晶体析出的控制。

In this thesis, Water Solubility, 1-Octanol/water Partition Coefficient, molecular Total Surface Area, Aqueous Activity Coefficient, Henry Law's Constant and gas chromatogram relative retention times for biphenyl and its 209 chlorinated congeners were studies with holographic QSAR techniques and highly predictive QSAR models were developed. An internal validation (cross-validation) and external validation were performed to evaluate the predictivity and robustness of the HQSAR models. Based on these highly predictive QSARs, the corresponding data of 5 properties of all these pollutants were presented.

应用简化的响应曲面分析来建立显著的预测模型，必须要考虑到空间立体因素的影响；基于分子模拟技术的三维QSAR技术能够建立显著的预测模型，并且有利于对毒性机理的理解；而基于分子全息的QSAR技术建立了具有高度预测能力的QSAR模型，组内交叉验证和组外预测等方法证明模型具有高度的预测能力和稳健性，可以对硝基芳烃这一类分子结构、体内代谢过程和致毒机理都很复杂的污染物进行定量预测。

By using equilibrium constant, activity coefficient, water activity and relative humidity of deliquescence properties in secondary aerosol model, we set the model and tested the sensitiveness.

本论文的研究内容主要将大气中二次气胶生成机制并入光化学轨迹模式中，利用大气气相-气胶之间热力动性质平衡常数(K、活性系数、水活度、相对潮解湿度，建置二次气胶模组，并测试二次气胶模组对各影响因子的敏感度。

Activity coefficient Number expressing the ratio of a substance's chemical activity to its molar concentration.

活度系数：化学术语，活度系数指物质的化学活度对其浓度之比。

Binary system ; activity ; phase diagram ; spline function ; numerical computation ; computer applications ; Free terras ; activity coefficient

二元体系；活度；相图；样条函数；数值计算；计算机应用；活度系数

The apparent surface activity coefficients are always ; i.e., there are neg. deviations from Raoult's law and the results always found experimental On the other hand, the calculated surface activity coefficient curves are always nearly sym.

结果表明，表面不均匀性将导致理想吸附混合物表观地呈现与Raoult定律的负偏差(表面活度系数小于1)。

The immunoregulation activity of SPG-1 mainly existed in the part of sugar chain, but keeping its molecular structure intact had some effects on its immunoregulation activity; SPG sulphation had reducing effects on the immunoregulation of SPG-1, whereas, after medium and low acetification of SPG, the immunoregulation of SPG was enhanced. Conversely after high acetification, the immunoregulation of SPG-1 decreased, that is, after introducing sulfuric and acetic acid base in SPG-1, its immunoregulation changed. All of these indicated the structure of SPG-1 was closely connected with its immune activity.⑤.

甘薯糖蛋白SPG-1的免疫调节活性主要在其糖链部分，但保持分子结构的完整性对其免疫调节的活性有一定的作用；甘薯糖蛋白硫酸化对甘薯糖蛋白SPG-1的免疫调节有降低作用，而中、低度乙酰化后，可提高甘薯糖蛋白的免疫调节作用，高度乙酰化后则降低其免疫调节作用，即甘薯糖蛋白引入乙酰基和硫酸基团后，其免疫调节活性发生了改变，这些均表明了甘薯糖蛋白的结构与其免疫调节活性有密切的关系。

Molecular Distillation is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.

分子蒸馏技术是一种在高真空条件下进行的连续蒸馏过程，适合于分离高沸点、热敏性及具有生物活性的混合物。

They are to the Noughties what yuppies were to the Eighties .

那在六十年代是时髦的，但在八十年代肯定是过时了