查询词典 molar tooth

Results show that 4-oxo-β-ionone is the major product with yield of 53.5% under the conditions as follows: reaction temperature 45℃, reaction time 24 h, the molar ratio of n: n(NaClO3): n 20: 100: 3, and pH value of solution in 1-3; on the other hand, 5,6-epoxy-β-ionone is major product with yield of 25.4% when reaction temperature is 40℃, reaction time is 24 h, the molar ratio of n: n(NaClO3): n is 20: 120: 5, and pH values of solution is 3. The excessive β-ionone can be recovered by vacuum distillation for reusing again. 4-oxo-β-ionone and 5,6-epoxy-3-ionone were purified by recrystallization and silica gel column chromatograph respectively with the purity over 98%.

研究结果表明：氯酸钠氧化β-紫罗兰酮的反应主要生成4-氧代－β-紫罗兰酮和5，6-环氧－β-紫罗兰酮，经重结晶和硅胶柱层析分离，纯度高于98%；4-氧代－β-紫罗兰酮的有利合成条件是反应温度为45℃，反应时间为24h，溶液的pH值为1~3，反应物配比n：n(NaClO3)：n为20：100：3，最佳收率为53.5%；5，6-环氧－β-紫罗兰酮有利的合成条件是反应温度为40℃，反应时间为24h，溶液的pH值为3，反应物配比n：n(NaClO3)：n为20：120：5，其收率为25.4%；未反应的β-紫罗兰酮经减压蒸馏回收后可重复使用。

Based on the method of BCA, we menstruate the molar extinction coefficient of R-PE. The molar extinction coefficient in the wavelength of 565nm and 280nm is 4.75X K^mor'cm"1 and 4.07 X104morIcm"1 respectively.

在BCA法进行蛋白质定量的基础上，测定了R-PE的565nm和280nm的摩尔消光系数，它们分别为4.75×10~5mol~(-1)cm~(-1)和4.07×10~4mol~(-1)cm~(-1)。

The better technology has been obtained: taking water-EG as solvent 2-imidazolidinone was prepared. The molar ratio of the methanal (36%) to the formic acid (85%) is 1:2.8, reaction temperature is 95~100℃, reaction time is 16 h, taking cuprous chloride and triethylamine as catalyst, the molar ratio of the cuprous chloride and triethylamin to 2-imidazolidinone is 1.0% while 1,3-DMI was prepared.

较佳工艺条件为：制备2-咪唑啉酮时，以水－乙二醇混合作溶剂；制备1，3-DMI时，甲醛(36%)：甲酸(85%)摩尔比为1：2.8，反应温度95~100℃，反应时间16 h，氯化亚铜和三乙胺作催化剂，用量分别是2-咪唑啉酮摩尔数的1.0%。

Replacing the liquid molar heat capacity at constant volume by its molar heat capacity at constant pressure causes a relative error from 17%to 56%.

若以摩尔定压热容的值代替摩尔定容热容，在上述13种液体中的误差为17%～56%范围以内。

In order to obtain the thermodynamic data of the synthesis of ethyl methyl carbonate from dimethyl carbonate and diethyl carbonate, the standard molar enthalpies of formation, Gibbs free energy and molar heat capacity under constant pressure are calculated by the method of Benson group contributions.

为了得到碳酸二甲酯和碳酸二乙酯酯交换合成碳酸甲乙酯反应的热力学数据，用Benson基团贡献法计算了相关物质的标准摩尔生成焓、吉布斯自由能和摩尔定压热容。

We have learnt the molar volume of gas in this class. After class, the students are interested in chemical English, so I must do it better. Molar volume of gas is very important in our middle chemistry. So we have to learn it well, And we have to work harder!

这节课我们学习了气体摩尔体积，课后，学生对英语化学很感兴趣，故需要我做的更好，气体摩尔体积在中学化学中很重要，所以一定要掌握好，并为之去努力奋斗。

The molecular parameters for 18 refrigerants were obtained by fitting saturated vapor pressure and liquid molar volume data. The overall average deviations of saturated vapor pressure and liquid molar volume were only 1.11% and 0.92%, respectively.

通过关联不同温度下制冷剂的饱和蒸气压和液体体积得到了18种纯制冷剂的分子参数，新方程计算的饱和蒸气压和液体体积总的平均偏差分别为1.11％和0.92％。

Cases that are level from first molar to first molar will still show a deep overbite.

案件的级别从第一磨牙先摩尔仍然显示出深覆。

The calculation method represented in this paper is very simple and convenient. By comparing the relative errors, the method is better than other methods. Moreover, it can be used to calculate molar Gibbs free energy and molar enthalpy of formation of all complex oxysalt minerals including a series of titanate whiskers that author's group has studied for many years. The thermodynamic data for the series of titanate whiskers provide necessary fundamentals to their preparation.

本文提出的方法计算步骤十分简单，从相对误差来看，本方法和其他方法相比精度较好，可以计算包含本课题组长期研究的钛酸盐系列晶须的所有复杂含氧盐矿物的摩尔生成Gibbs自由能和摩尔生成焓，为热力学在钛酸盐系列晶须制备中的应用提供理论支持。

Objective: To observe if there is the existence of a third root canal in the distal root of the mandibular first molar so as to avoid the clinical treatment of mandibular first molar root canal in the distal root left to provide guidance.

目的：观察下颌第一磨牙远中是否存在第三根管，以期为临床治疗中避免下颌第一磨牙远中根管的遗漏提供指导。

This immediately brings us to the next part of this article: creating an output "replace function".

下面进入文章的第二部分：建立一个"缓存处理函数"。

He was elected as an International Ornithological Committee member in 2002 during the 24th IOC held in Beijing.

现为中国鸟类学会理事和WPA 专家组成员。2002年被推选为国际鸟类委员会委员。