查询词典 ionic

ABSTRACT The ionic strength of mobile phase can significantly affect the peak shape of ionogenic compounds such as antibiotics in reversedphase high performance liquid chromatography. The influence may be attributed to overloading of ionogenic analytes in lower ionic strength mobile phase.

在反相高效液相色谱过程中，流动相的离子强度可显著影响可解离的化合物如抗生素的色谱峰形，原因在于流动相的离子强度较低时，色谱填料的固定相易于过载，使离子化的化合物的色谱峰形呈典型的过载特征――峰形接近直角三角形。

ABSTRACT The ionic strength of mobile phase can significantly affect the peak shape of ionogenic compounds such as antibiotics in reversedphase high performance liquid chromatography. The influence may be attributed to overloading of ionogenic analytes in lower ionic strength mobile phase. In such phase, peak becomes increasingly rightangled triangle in shape with increasing sample load together with increasing peak width and tailing.

在反相高效液相色谱过程中，流动相的离子强度可显著影响可解离的化合物如抗生素的色谱峰形，原因在于流动相的离子强度较低时，色谱填料的固定相易于过载，使离子化的化合物的色谱峰形呈典型的过载特征――峰形接近直角三角形。

ABSTRACT ionic strength of mobile phase can significantly affect the peak shape of ionogenic compounds such as antibiotics in reversedphase high performance liquid chromatography. The influence may be attributed to overloading of ionogenic analytes in lower ionic strength mobile phase. In such phase, peak becomes increasingly rightangled triangle in shape with increasing sample load together with increasing peak width and tailing.

在反相高效液相色谱过程中，流动相的离子强度可显著可解离的化合物如抗生素的色谱峰形，原因在于流动相的离子强度较低时，色谱填料的固定相易于过载，使离子化的化合物的色谱峰形呈典型的过载特征――峰形接近直角三角形。

The effects of reaction time, mole ratio of reactants and amount of catalyst on yield of ketal were investigated by using the [SO3H-bPy] [H2PO4] ionic liquid as catalyst. Results show that the ionic liquid was an efficient catalyst for the ketalization with high conversion and selectivity in mild conditions.

以磺酸基功能化的吡啶磷酸类离子液体[SO3H-bPy][H2PO4]为催化剂，系统考察了反应时间、酮与醇的配比、催化剂的用量及催化剂重复使用、不同阴离子、阳离子等因素对反应的影响，优化了反应条件。

Crystal structure of melilite is limited by MgO content of glazes, also restricted by O/Si ratio. Because of differences of ionic radius and ionic polarization capacity between Ca〓 and Mg〓, suitable O/Si ratio for melilite is influenced by content of CaO and MgO to a certain extent.

结晶釉中黄长石结构的出现，除了和MgO含量相关外，还受O/Si比值的限制；而Ca〓和Mg〓离子半径和离子间的极化能力的差异，使钙镁含量对形成黄长石结构的O/Si比值具有一定的影响。

The critical micellar concentrations for the ionic and non-ionic surfactant systems have been calculated by applying the proposed equation.

应用所建立的状态方程进行了离子和非离子表面活性剂体系临界胶束浓度的计算。

Many methods on extraction and separation are determinated by different characteristics of soybean major antigen protein,such as isoelectric precipitatio,cryoprecipitate,salt fractionation,ionic strength and immunization and so on.Influential factors of extraction and isolation include pH of buffer solution,ionic strength,moity and so on.

大豆主要抗原蛋白不同的特性决定其提取和分离方法很多，主要有：等电点沉淀法、冷沉淀法、盐析法、按离子强度不同而沉淀分离法、免疫法等，提取和分离过程中影响大豆主要抗原蛋白分离的因素包括提取缓冲液的pH、离子强度、组成成分等。

Four different ionic liquids, BF4, BF and PF6 were investigated, arid PF6 showed the best effect when used as the reaction media, giving the highest yield in the shortest reaction time. Promoted by KF in PF6, N-aryl or N-alkyl monosubstituted sulfonamides could react with various activated halides and unactivated primary halides smoothly. Reactions were performed at 85℃ for 2~10 hours, and thirteen N-alkylation products were obtained with 70%~97% yields. Moreover, the ionic liquid recovered could be reused for three times with no appreciable decrease in yield and reaction rate.

结果表明，以PF6为反应介质时显示出了最好的效果，反应的时间最短，收率最高。N-芳基或N-烷基单取代的磺酰胺和各类不同结构的活化的卤代烃和未活化的一级卤代烃在PF6中KF作用下，85℃反应2~10h，以70%~97%的优良收率得到了13个N-烷基化产物，而且离子液体回收使用3次后效果未降低。

The nickelous chloride both may use in to galvanize, and is prepares the galvanization chemical thionamic acid nickel the important raw material, lead is affects the electronickelling quality a important attribute, in the present industry 331 ion exchange resin deleading effect still could not arrive in the electronickelling the lead content standard, used pocket weak basicity resin XSC312 after the screening experiment determination to take from the nickelous chloride solution intermediate ion exchange except the micro lead resin, inspected the material fluid pH value, the contact duration in the ionic exchange column to the ionic exchange adsorption lead influence, has determined the resin adsorption capacity and inspected the resin analysis performance.

氯化镍既可用于电镀，又是制备电镀化学品氨基磺酸镍的重要原料，其中的铅是影响电镀镍质量的一个重要因素，现行工业中的331离子交换树脂除铅效果尚不能到电镀镍中铅含量标准，经过筛选试验确定采用大孔弱碱性树脂XSC312作为从氯化镍溶液中离子交换除微量铅树脂，在离子交换柱中考察了料液pH值、接触时间对离子交换吸附铅的影响，测出了树脂的吸附容量并考察了树脂的解析性能。

Third, we studied the N-alkylation of phthalimide, indole, benzimidazole, succinimide with a variety of halogen in ionic liquid [BF4], [PF_6]. The present method has many obvious advantages, compared to those reported in the literature, including the generality, simplicity of the methodology, the ease of product isolation, the higher yield and potential for recycling of ionic liquids.

第三、研究了离子液体[BF_4]、[PF_6]和BF_4促进邻苯二甲酰亚胺、吲哚、苯并咪唑、丁二酰亚胺的N-烷基化反应，克服了传统溶剂中进行N-烷基化反应要求强碱、反应条件苛刻、时间长、产率一般的不足，改善了反应条件、提高了产率。

How much are those earings?

这对耳环多少钱？

When you stay in the empty of public space/place, what is your feeling?

当你站在一个"空的空间/地方"，你有什麼感觉？？