The chromatography conditions were as follows:ZORBAX SB-C18(250 mm×9.4 mm I. D., 5 μm)column was used as the steady phase; SC-CO2 with methanol as co-solvent was used as the mobile phase. The percent of modifier, temperature and pressure were investigated to get good resolution. In this paper, capacity factor and selectivity factor were also investigated.
采用ZORBAX SB-C18(250 mm×9.4 mm I.D。，5μm)色谱柱为固定相，SC-CO2/甲醇为流动相，考察了超临界流体色谱分离提纯烟草萃取物中茄尼醇的工艺条件、流动相流速和改性剂含量对分离度的影响，以及温度和压力对茄尼醇容量因子、茄尼醇与相邻色谱峰组分分离度和选择性因子的影响。
The effect of pressure, temperature and type of modifier in mobile phase on the retention factor, selectivity and resolution was investigated. It was found that retention for both enantiomers decreased markedly as modifier concentration rose up to 10%.
研究帕罗西汀中间体在超临界流体色谱中的分离规律，以Chiralpak AD柱为固定相，考察改性剂类型(包括甲醇、乙醇和异丙醇)、温度和压力对保留因子、分离因子和分离度的影响规律。
First, a chlorinator was self-designed in this paper, and dichloride of 2-methyl-1-propene was synthesized by 2-methyl-1-propene reacted with chlorine fast in this reactor. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the yield and selectivity of dichloride of 2-methyl-1-prop-ene were more than 65% and 80% respectively. Second, the preparation of 2-methylene-1, 3-propanediol, which dichloride of 2-methyl-1-propene reacted with alkali was investigated. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the conversion of dichloride of 2-methyl-1-propene was 100%. Moreover the preparation of MPO, which 2-methylene-1, 3-propanediol reacted with hydrogen, in presence of Al_2O_3-Pd catalyst, was gotten, and the product was appraised.
本文在氯化反应过程中，自行设计制作出了氯化管式反应器，在该反应器中异丁烯和氯气迅速混合反应生成二氯异丁烯，根据该氯化反应特征利用正交试验和单因素试验考察了有关因素的影响并优化得到了最佳工艺条件，二氯异丁烯的总收率达65％以上，选择性达80％；接着，对二氯异丁烯进行水解反应制得了2-甲烯-1，3-丙二醇，讨论了相关因素对水解反应的影响，并通过正交试验和单因素试验得到了较佳工艺条件，二氯异丁烯的转化率达100％；同时还对制备的2-甲烯-1，3-丙二醇在常压下采用三氧化二铝负载钯催化剂催化加氢得目的产物MPO，并对产品进行了鉴定，从而打通了整个工艺路线。
According to our study, the Fukui function is not the only factor to determine the selectivity of a chemical reaction, while the principle of hard and soft acid and base in a local sense can be used to understand this kind of reactivity.
研究表明，Fukui函数不是决定反应选择性的唯一因素，而局域意义的软硬酸碱原理可用来理解此类反应性。
On the other hand, the epidermal growth factor receptor inhibitor gefitinib was not initially appreciated to have selectivity for lung cancer patients with mutated EGF receptor and because of this 4, 000 patients in 4 major clinical trials were not optimally selected to benefit.
在另一方面，表皮生长因子受体抑制物吉非他尼开始不被理解对肺癌有选择性随着表皮生长因子的突变并且由于在4个重要的临床试验中的4000个病人没有理想的被选择得利。
Gas permeation testing showed that the membranes were of gas selectivity, and the separation factor of hydrogen to nitrogen was 3.03 at 0.1 MPa. Which means the gas diffusion through the membranes was mostly governed by Knudsen diffusion mechanism.
气体渗透实验进一步说明，复合膜具有一定的气体选择性，在0.1MPa下对H2/N2的分离因子为3.03，表明气体通过膜的扩散以Knuen扩散传质为主。
Increasing the temperature decreases the capacity factor and chiral selectivity factor.
随着温度的升高，样品的容量因子降低，手性选择因子α减小。
It was comprehensively studied that the effect of pressure, temperature and modifier concentration in the mobile phase on the capacity factor, selectivity and resolution of tocopherols.
本文系统的研究了温度、压力和改性剂浓度对生育酚异构体在超临界流体色谱中分离效果的影响。
In the range of temperature 274 to 313 K, the R-enantiomer is eluted firstly, and the capacity factor, selectivity and resolution of enantiomers decrease as temperature increases.
为手性固定相时，利用高效液相色谱法考察了流动相组成、pH值、温度对萘普生和布洛芬对映体拆分的影响。在温度274～313K的实验范围内，R-体先被洗脱；
The formation and growth of anatase crystalline phase is the key factor in the improvement of catalytic selectivity.
锐钛矿TiO2（A）晶相的形成与完善是提高催化选择性的关键因素。
The concurrent action of alcohol and β - cyclodextrin enhances the fluorescence intensity of 1, 4-dihydroxyanthraquinone-beryllium system by a factor of more than ten and improves the selectivity of the reaction remarkably.
乙醇与β-环糊精的协同作用，使1,4-二羟基蒽醌-Be体系荧光强度提高10倍以上，反应选择性有所改善。
The correlativities between the enrichment factor of HBAs and their n-heptanol/water conditional distribution coefficients (log Pn-heptanol/5 mmol/L HCl), pKa and the number of ~OH; the extraction mechanism that polyvinylidene difluoride hollow fiber contributed to promote the extraction efficiency by forming charge transfer compound with HBAs and the organic solvents showed notable selectivity for HBAs were elucidated.
在优化的三相中空纤维液相微萃取(3p-HFLPME)条件下，研究了6种羟基苯甲酸类化合物的3p-HFLPME行为；揭示了HBAs的富集因子与其正庚醇/水条件分配系数(log Pn-heptanol/5 mmol/L HCl)、pKa和羟基数目的相关性，初步阐明了聚偏氟乙烯中空纤维对HBAs的电荷转移传递机理以及有机溶剂对HBAs的选择性萃取机理。
Studies on selectivity of recognizing factor for RMF promoter
rmf基因启动子识别因子选择性研究
This side reaction in the DKR of secondary happens to be an important factor in the selectivity of DKR products.
这种副反应恰好是影响DKR过程选择性的一个重要因素。
Defected ground structure; defect parameters; lowpass filter; sharpness factor; selectivity
缺陷地结构；缺陷参数；低通滤波器；陡峭因子；选择性