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Reaction thermodynamics of diphenyl carbonate synthesis by the transesterification reaction from dimethyl carbonate and phenol is introduced.

介绍了碳酸二甲酯与苯酚酯交换合成碳酸二苯酯的反应热力学。

Under the conditions that the molar ratio of dimethyl carbonate to N,N′-diphenyl urea was 10∶1,the amount of catalyst Bu2SnO was 2%,reaction temperature was 160℃,and reaction time was 2 h,the yiel...

在反应物碳酸二甲酯和二苯基脲的摩尔比为10∶1，催化剂Bu2SnO的用量为2%，160℃时，反应2h，MPC的收率达到98%，远高于文献结果(77%)。

Since the dismutation of superoxide radicals by SOD is a reaction that is rate-limited by diffusion and enhanced by electrostatic guidance, all these structural features may be related to GP-MnSOD's high catalytic activity: first, Lys38 may increase the effective enzyme-substrate association rate by enhancing the electrostatic gradient at its substrate channel; second, an excess of acidic over basic residues makes the negative surface potential of GP-MnSOD more larger than those of other known MnSODs. This may enhance the reaction rate by reducing futile collisions of superoxide radicals with GP-MnSOD's surface.

因此，GP-MnSOD的上述结构特征可能与GP-MnSOD的较高酶活有关：首先，Lys38增加了底物通道口的正静电势梯度，从而可能促进了GP-MnSOD的活性中心与底物的有效结合速率；其次，GP-MnSOD表面覆盖的过量酸性残基使得它比其它MnSOD在底物通道以外的蛋白表面更多地被负静电势所覆盖，这可能有效地减少了超氧阴离子与GP-MnSOD表面的无效碰撞，从而提高了反应速率。

All aerobic organisms can produce 〓,which can become 〓 by disproportionation reaction and more reactive 〓 byFenton reaction.

所有的需氧生物体内均可产生〓，在体内可经进一步的岐化反应生成〓及经Fenton反应生成反应活性更高的〓。

The effect of the formation enthalpies on disproportionation reaction of the alloys at high temperature hydrogenation is discussed and it is found that the greater the entropies of alloys are, the more favorable it is for the disproportionation reaction.

讨论了生成焓对高温氢化时合金发生歧化反应的影响，合金的生成焓愈大，对歧化反应愈有利。

On the basis of the analysis of the mechanism of β-elimination reaction of haloalkyl,the influence regularity of the dissolvent polority for the reaction is discussed.

在分析了卤代烷β－消去反应的反应机理的基础上，讨论了溶剂的极性对反应的影响规律。

Reaction temperature, reaction time and different distillate oil on the properties of petroleum sulfonate were studied.

本文以发烟硫酸和三氧化硫作为磺化剂，选用重烷基苯或石油馏分油，在不同的工艺条件下进行磺化反应，摸索了反应物配比、反应温度、反应时间和不同原料等条件对合成产物的性能影响，得出反应物配比是影响磺化收率的重要因素。

Vapor makes the activity and selectivity of the catalyst decrease a great deal yet this disvalue is reversible; When the elemental sulfur and vapor exist simultaneity in the system, it might generate H〓S and S on 〓 catalyst since the anti-Claus reaction, but this phenomena is not observed on CoS〓-TiO〓 catalyst showing that sulfides could check the anti-Claus reaction.

对硫化物催化剂CoS〓-TiO〓来说，助剂La和Ce的引入对CoS〓-TiO〓催化剂的氧化还原性能有一定影响，硫化物催化剂平均粒径要小，但助剂并未改变催化剂的电子结构，对于氨分解克劳斯反应的活性改变不大明显。

The influence of each condition on the reaction speed and yield was studied, and the optimal conditions were: the ratio of the amount of substance of aromatic amine and heptafluoro-isopropyl iodine was 1:1.1~1.5, the amount of substance of sodium dithionite, sodium bicarbonate, aniline compounds were respectively 1.1~1.3, the amount of substance of phase transfer catalyst TBAB and aniline compounds was 0.05~0.1, the concentration of aniline compound was 0.5~1.0 mol/L, reaction temperature was 10~20 ℃, and the solvent was aether.

最佳结果为：芳胺与七氟异丙基碘的物质的量比1：1.1~1.5，连二亚硫酸钠、碳酸氢钠与苯胺的物质的量分别为1.1~1.3，相转移催化剂四丁基溴化铵与苯胺的物质的量比在0.05~0.1，溶剂总用量使苯胺浓度在0.5~1.0 mol/L；反应温度10~20℃；溶剂采用乙醚。取代基供电子性越强，反应时间越短，产率越高；氨基的对位优先反应，氨基的邻位较难发生反应；且七氟异丙基总是优先取代在芳环电子云密度较高的位置上。

It also presents discussion of some reaction phenomena, the reaction mechanism as well as its application research of DLC films.

另外还研究了类金刚石薄膜的机械、电学等性能。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新