查询词典 reaction rate

In some cases, the hydrolysis step can be the rate-limiting reaction.

7在某些情况下，水解可以是能逐步限速的反应。

Kinetics of methanol dehydration to dimethyl ether on modified kaolin catalyst was studied in an integral reactor under normal pressure. It is deduced that the surface reaction of methanol molecule adsorbed on the active site of catalyst with methanol molecule in gas phase is the rate determining step. The hyperbolic type kinetic equation r=ksbMpM2/(1+bMpM+bpE) is obtained according to the theory of langmuir even adsorption and using the R-E mechanism.

采用积分反应器，考察了常压下在改性高岭土催化剂上甲醇脱水生成二甲醚的反应动力学，根据Langmuir均匀吸附理论，采用R-E机理，推断吸附的甲醇分子与气相主体中的甲醇分子发生的表面反应为速率控制步骤，得到双曲线型动力学方程为： r= ksbMpM2 /(1+bMpM+bpE)（r为反应速率， ks为反应速率常数， bM为甲醇的吸附平衡常数， b为二甲醚和水的吸附平衡常数之和， pM、 pE分别为甲醇、二甲醚的分压）。

The decomposing kinetics of ilmenite in KOH sub-molten salt was investigated. The effects of factors, such as reaction temperature and particle size of the ore, on the decomposition rate of ilmenite were also studied.

摘 要：对钛铁矿在氢氧化钾亚熔盐体系中的分解动力学进行研究，考察反应温度及矿粒粒径对钛铁矿分解率的影响。

They demonstrate that not enamine formation but both the reaction of the enamine with the electrophile and hydrolysis of the resulting imine are rate limiting.

这证明不只是烯胺结构，烯胺与亲电体的反应和产物亚胺的水解都是限速。

Effects of materials input flow rate and variation of catalyst activity on the reaction are studied. Results show that the reluctance of H〓 concentration in the CSTR leads to bad control of MI.

分析了进料和催化剂活性变化对反应的影响，结果表明，氢气动态特性的滞后是产品质量控制的难点。

The dose-response curve of histamine was shifted parallely to the right. pA2 was 9.34±0.61. The guinea-pigs were effectively reduced the rate of histamine induced death, decreased reaction extent of shock (P＜0.01) and prolonged latency period of shock (P＜0.05) by orally administered cetirizine ranged from 0.1, 0.2 and 0.4 mg.kg-1. The capillary permeability to intracutaneous injection of histamine was potently inhibited by orally administered cetirizine ranged from 0.0625 to 0.25 mg.kg-1 in mice, blue area obviously decreased (P＜0.01), and dose-response curve existed obviously. In which the effect of these dosage groups were superior to the group of chlorphenamine.

结果：西替利嗪3×10-8～3×10-7mol.L-1可剂量依赖性地对抗组胺引起的肠肌收缩，使组胺的量效曲线平行右移，pA2为9.34 ± s 0.61，西替利嗪0.1，0.2及0.4 mg.kg-1口服给药时，能明显减轻豚鼠静脉注射组胺所致休克反应的严重程度(P＜0.01)，并可延长豚鼠惊厥反应的潜伏期及降低死亡率(P＜0.05)，西替利嗪0.0625～0.25 mg.kg-1口服给药可显著对抗组胺引起的小鼠皮肤血管通透性的增高，使蓝染面积显著缩小(P＜0.01)，且存在明显的量效关系，3个剂量组的作用均优于氯苯那敏组。

The structure of iron core from horse spleen ferritin and the extra phosphate had an effect upon the rate of iron release, but the reaction order was not changed.

而近期的研究又进一步指出了铁蛋白铁核表层的高磷铁比结构可能与蛋白所表达的生理功能有一定的联系[7]。

The theoretical deduction and many experiments discovered that reaction of isocyanate with water is second order in room temperature, and the water and isocyanate are first order to the rate respectively.

通过理论推导和大量实验证明，室温下异氰酸酯与水的反应可以使用准二级方程描述，水和异氰酸酯基的分级数都是1。

The formation of 1,3- and 1,6-DMC resulted from methylation at ring carbon 3 and 6, which have identical reaction activities, in 1-methylcarbazole in kerogen matrix with identical rate. The 1,4- and 1,...

相对于1，3-DMC和1，6-DMC而言，1，4-DMC和1，5-DMC显示出相当一致的变化趋势，表明了在1-甲基咔唑进一步的甲基化中，3、6与4、5环碳位上存在竞争性反应过程。

In this study,TGA and self-made vacuum pyrolysis apparatus were used to detect the characteristics of biomass pyrolysis liquation and the rules of preparation of activated carbon under vacuum.The seven kinds of common agricultural and forestry waste biomass were from Yiyang. The main contents studied are as follows:(1) TGA was used to detect the influence of biomass species and heating rate on the pyrolysis reaction.

本研究采用真空热重分析仪和自制的真空热解实验装置，对益阳地区7种农林废弃生物质进行了真空热重、真空热解液化和真空化学活化等实验研究，以探讨生物质真空热解特性行为和生物质真空化学活化法制备活性炭的规律等，主要内容包括以下几个方面：(1)对7种生物质进行了真空热重分析，考察了不同生物质原料、升温速率对生物质真空热解反应的影响。

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％。