查询词典 ionization potential

The outstanding properties of near-critical water comparing to that of water at ambient temperature and pressure are its high ionization constant and low dielectric constant,so it possesses self-acid/base catalysis function and special solubility of organics and inorganics.

近临界水与常温常压水相比其突出的性能是电离常数大和介电常数小，因而近临界水自身具各酸碱催化功能和能同时溶解有机物和无机物的特性。

A new method for the separation and purification of chiral mandelic acid by heated benzene extraction and refrigeration crystal was established. The ionization constant of mandelic acid was mensurated by pH potentiometer titration.

采用pH值电位滴定法测定了扁桃酸的离解常数，采用高效液相色谱法考察了扁桃酸在不同溶剂中的溶解度曲线和在苯-水体系中于不同pH值条件时的分配率，建立了热苯萃取和冷却结晶的扁桃酸纯化工艺。

Chiral drugs ; mandelic acid ; ionization constant ; solubility ; mensuration

手性药物；扁桃酸；离解常数；溶解度；测定

Methods The ionization constant was determined with acid-basle titration in acetone/water solutions with different ratios, the pH at half neutralization point was regarded as pKa, the value to infinite diluted in pure water was explored and the lgP was determined with bottle-shaking method by HPLC.

方法采用酸碱滴定法测定各不同体积比的丙酮-水溶液中药物半中和点时的pH值作为药物在该体积比的丙酮-水溶液中的pKa值，再外推至纯水中药物浓度无限稀释时的pKa值；采用HPLC配合摇瓶法测定药物的分配系数。

The solubility curve of mandelic acid in different solvent and the distribute ratio of mandelic acid in benzene-water system in different pH condition were determine by HPLC. The results showed that the ionization constant pK_a of mandelic acid was 5.28, the solubility of mandeli...

研究结果显示，扁桃酸的离解常数pKa值为5.28；扁桃酸在水和苯中的溶解度曲线可分别表示为：S=38.756e0.0354t和S=0.2746e0.0649t；扁桃酸在水和苯中的溶解度差值曲线可分别表示为：ΔS/S1=0.1196t-2.712和ΔS/S1=0.3688e0.0723t；苯是最适合用于冷却结晶的溶剂；热苯萃取扁桃酸的苯水比例可选为1∶1；降低pH值有利于扁桃酸在苯中的分配。

D-amino acid ; Glutathione ; Non-covalent complex ; Electrospray ionization mass spectrometry ; Dissociation constant

D-氨基酸；谷胱甘肽；非共价复合物；电喷雾质谱；解离常数

Key words thin-layer pH-chromatography;ionization constant;organic acid

如果当固定相的［H+］＞＞Ka时，则Ka/［H+］可忽略，这样即可得到Rf值的极限值

In order to analyze the thermal cracking products of fuels, we set up a GC analytical system. The gas products, which comprise methane, ethane, ethylene, propane, propylene and other gases, were collected and analyzed by gas chromatography provided with a flame ionization detector . We calculate the theoretical heat sink of n-heptane at the temperature of 600℃ and 800℃. The theoretical heat sink calculation of iso-octane at 700℃ is also related.

建立了用于分析裂解产物的气相色谱分析系统，解决了本研究中对气态裂解产物的分析要求，特别是气态小分子饱和烃和不饱和烃的有效分离；并根据裂解产物的组成及其生成热数据，对正庚烷在600℃和800℃，异辛烷在700℃时裂解的热沉进行了理论计算。

K shell ionization cross sections of Ti and V elements from the measured result of K α X rays using the spectrometer are derived.

电子碰撞引起原子内壳层电子电离截面的研究是现代原子分子物理的基本问题之一，也一直是实验和理论工作者关注的课题。

The coronal green line, for example, came from the 'forbidden line' of iron-14, written , iron stripped of 13 of its 26 electrons (neutral iron is Fe I, so the Roman numerals exceed the ionization number by 1), which would require such a high temperature that the corona must be at millions of kelvins.

例如日冕谱线中那条绿线，来自铁-14

The quality of both red and white wine depends very much on the wine maker talent and on the quality of the grapes.

他的红酒和白酒的品质，根据酿造者的能力和葡萄的质量，各有差异。

No, I don't want to get drunk before my next match.

" "不，我不想让我的下一场比赛前喝醉了。