查询词典 acid ratio

The optimal conditions were obtained that isopropanol concentration 95% mass ratio of sodium hydroxide to soybean dietary fiber and monochloracetic acid 1.00:1.25:1.20, alkalization time 60 minutes, etherification temperature 70 degrees C, and etherification time 120~150 minutes.

以大豆膳食纤维为原料，一氯乙酸为醚化剂，异丙醇为溶剂，制备了羧甲基大豆膳食纤维，研究了异丙醇溶液质量分数、NaOH用量、MCA用量、碱化时间、醚化温度、醚化时间对产品羧甲基质量分数的影响。

The effects of reaction temperature on the yield and the purity of monochloroacetic acid under a determined molar ratio of raw materials were investigated.

用氯气与醋酸在氯乙酰氯催化下合成了一氯乙酸。

The optimum reaction conditions were: at present of acetic anhydride, a stoichiometric quantity of nitric acid, at room temperature for 40 minutes. Nitration of chlorobenzene gave a,50% yield of mononitro compounds, and an ortho-para isomer ratio 0.20 in product distribution of chlorobenzene mononitration.

结果表明：硅钨酸催化性能较好，催化剂载体以纳米二氧化硅最好，反应条件中醋酸酐用量是主要影响因素；SiW_(12)O_(40)~(4-)／纳米SiO_2催化剂具有强对位选择性：在醋酸酐存在下，氯苯与等当量的硝酸室温下反应40分钟，氯苯一硝化产物中邻／对硝基氯苯异构体的质量比达0.2，产率可达50％。

A series of newl naphthalenic sulfonated polyimides were synthesized using 1,4,5,8-naphthalenetetracarboxylic dianhydride, 2,2'-benzidinedisulfonic acid by one-step high temperature polymerization method. The sulfonated degree of SPI-X membranes was controlled through adjusting the molar ratio of BDSA to the non-sulfonated diamines.

采用1，4，5，8-萘四酸二酐、2，2′-联苯二胺双磺酸和APBA为单体，通过高温一步聚合法合成了含有噁唑环的新型磺化聚酰亚胺，通过调节二胺单体的比例控制磺化程度。

The experiment lasted for 3 weeks with 4 mice killed every week. The ratio changes of T, B lymphocyte were tested by using the acid α-naphthyl acetate esterase test.

实验分3周进行，每组每周各杀4只，采用酸性α-醋酸萘酯酶方法检测T、B淋巴细胞的动态比值变化。

The studies showed that the optimum conditions of the reaction were the amount of the 75% gathers the phosphoric acid 30 mL,the mole ratio ofhexamethylene tetramine to nitrophenol was 2∶1,the reaction time was about 3.0 hours,the reaction temperature was about 105℃.

结果表明较佳反应条件是：在对硝基苯酚为3.5 g的情况下，75%的多聚磷酸用量为30 mL，n∶n=2∶1，反应时间为3.0 h，反应温度105℃，5-硝基水杨醛的产率可达68.1%。

The same methods were used to study toluene dinitration, and the results indicated that the thermal runaway risks of these reactions were low too; prolonging dosing duration was helpful to the conversion of all nitrotoluene; decreasing the molar ratio of nitric acid to mononitrotoluene would make an insufficient conversion; among the given temperatures, rising reaction temperature couldn\'t markedly change the yield coefficient, but lead more heat generation and higher thermal runaway risk.

采用同样的方法对二段硝化反应进行研究，结果表明：二段硝化反应的热失控危险性也较低；延长加料时间，有利于反应完全；而随着硝酸与一硝基甲苯摩尔比的减小，硝化难以进行完全；在选定温度范围内升高温度，产物得率无显著变化，反而易导致放热加剧，增加体系的热失控危险。

The ratio between nonsynonymous and synonymous substitutions for CP gene is 0.092 which indicated the negative selective pressure for amino acid changes. No distinct correlation was found among isolates in different years or different isolates in one year in a

灰飞虱的RAPO聚类分析结果与病毒CP基因的系统发育分析结果具有一些相似性，初步暗示了RSV与灰飞虱很可能是共同进化的。

The ratio between nonsynonymous and synonymous substitutions for CP gene is 0.092 which indicated the negative selective pressure for amino acid changes. No distinct correlation was found among isolate s in different years or different isolates in one year in a

灰飞虱的 RAPO聚类分析结果与病毒CP基因的系统发育分析结果具有一些相似性，初步暗示了 RSV与灰飞虱很可能是共同进化的。

The experiment results showed that the optimum reaction condition were as follow: concentration of H_(2)SO_(4) was 0.5 mol/L, calcinations time were 4 h at the temperature 550℃, the molar ratio of acrylic acid to octadecyl alcohol was ...

丙烯酸十八酯的优化工艺条件为：丙烯酸与十八醇的摩尔比为1.2，固体超强酸及对苯二酚的用量分别为6%、0.8%，反应温度为120℃，反应时间为3 h。在此反应条件下，酯化收率可达97%。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。