反应率

Meanwhile,different from the conventional snake flow field,the PEM fuel cell with interdigitated flow fields has stronger resistance to the humidification temperature.

前人研究中发现PEM燃料电池工作中的反应物到达反应区的最大质量传递率决定了电池所能够提供的最大极限电流及最大功率输出。

Sucrose crystal was pre-irradiated by γ-ray of ~(60)Co and turned into an activated form, then the activated sucrose was polymerizes directly with another monomer e.g.

同时对蔗糖基聚合物的有机相酶催化合成法进行了初步研究。在预辐照法中，研究了反应单体、蔗糖预辐射剂量、存放时间、温度、反应物料配比对蔗糖基聚合物的粘均相对分子量和产率的影响。

Results The SiO2-ZrO2 composites were calcined at 200℃ prior to sulfating, the concentration of sulfuric acid was 1.0 mol/L ,the molar ratio of Si and Zr was 15, the calcination temperature was 500℃, the molar ratio of ethynol and lactic acid is 3/1, the yield of the ester could reach 92.7%.

结果SO4^2-／SiO2-ZrO2固体超强酸催化乳酸乙酯的合成反应适宜的反应条件为：预焙烧温度为200℃，浸泡硫酸浓度为1.0mol／L，硅锆摩尔比为15，焙烧温度为500℃，醇酸比为3时，酯化率可达92.79／6。

Polyaspartic acid was synthesized with maleic anhydride and salvolatile as raw material by the method of thin layer polymerization.

以马来酸酐和碳酸铵为原料，通过薄层聚合制备了聚天冬氨酸，研究了反应物配比、聚合时间及反应温度等因素对聚合物产率、相对分子质量的影响；考察了聚合物用量及相对分子质量对阻垢性能的影响。

The results show that the catalyst could catalyze the Heck reaction of substituted aryl halide with crylic acid, the yields were above 80%.

结果显示，CL-HA-Pd/Ni具有较快的反应速率和较高催化活性，可成功催化取代芳基卤与丙烯酸的Heck反应，产率在80%以上。

The effect of reaction temperature, time, water volume, oxidant, acetic acid, ethanol, and sodium carbonate on the yield of reducing sugar were investigated.

在亚临界水的状态下对稻壳和麦麸进行水热糖化实验，考察了反应温度、反应时间、加入水的体积以及氧化剂、醋酸、乙醇、碳酸钠等对还原糖产率的影响。

The optimum conditions were obtained: the amounts of NaOH solution,quaternary ammonium and benzyl chloride are respectively 16 mL,0.4 g and 15 mL; the reaction temperature and time are 120 ℃ and 3 h.

在NaOH溶液用量16 mL，反应温度120 ℃，季铵盐用量0.4 g，反应时间3 h，氯化苄用量15 mL的条件下，竹纤维的接枝率达143.68 %。

Using the theory of radiative capture reaction and combining our department experiment, we investigate two nuclear reactions, 11C12N and 12C13C, and calculate the cross sections and astrophysical reaction rate of them.

利用研究的辐射俘获反应的理论，我们结合了我所的实验工作，研究了两个天体物理感兴趣的核反应~(11)C~(12)N和~(12)C~(13)C，计算了它们的反应截面以及天体核反应率。

Cellulose acetates with different substitution degrees were synthesized with wood pulp as raw material and dodecylbenzenesulfonic acid as catalyst.

结果表明：随着反应时间、反应温度、醋酸酐与纤维素质量比和催化剂用量的提高，其取代度DS增大，但产率降低

This novel reagent was treated with LDA to produce polystyrene-supported a-seleno carbanions, which reacted with alkyl halides and epoxides, followed by stereospecific selenoxide syn-elimination to give olefins and allylic alcohols respectively.

它与LDA反应形成α—硒基稳定的碳负离子，再与卤代烃或环氧化合物发生α—烷基化反应，烷基化后的树脂可以在30%的双氧水中进行氧化-消除，以良好产率和较高纯度合成了取代烯烃或烯丙基醇。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！