查询词典 reaction

The results show that among the acetoacetonate complexes,Co_3 has the best catalytic activity.The optimum reaction conditions were as follows:0.764 mmol of Co_3,mole fraction of ethanal 10%based on the substrate,room temperature,oxygen pressure 2 MPa,reaction time 11h and solvent acetonitrile.Under these conditions,13.3%p-chlorobenzaldehyde was obtained with 15.3%conversion and 87.2%selectivity.The oxidation can also be carried out without solvent with 8.1%conversion,89.1%selectivity and 7.2%yield respectively.

在金属配合物中Co_3的催化性能最好，在其用量为0.764 mmol、乙醛用量为反应物物质的量的10%、氧气压力为2MPa时，以乙腈为反应介质，室温下反应11h，反应的转化率和选择性可达15.3%，87.2%，对氯苯甲醛收率可达13.3%；反应也可在无溶剂时进行，此时反应的转化率、选择性及醛的收率分别为：8.1%，89.1%，7.2%。

The optimum reaction condition was as follows: catalyst dosage=4.3% of the amount of ethanediol,reaction time 50 min.1,4-dioxane yield of 84.82% was obtained under the optimum condition.

考察了催化剂用量、反应时间和反应温度等因素对收率的影响，得出最佳反应条件：催化剂用量为乙二醇质量的4.3%，反应时间50 min，收率可达84.82%。

Their catalytic activities in the condensation reaction of cyclohexanone with ethanediol were studied.The results showed that the catalytic activity of SO_4~(2-)/ZrO_2-Ce_2O_3 in the condensation reaction ...

实验表明：(1)SO42-/ZrO2-Ce2O3在缩合反应中的催化活性比SO42-/ZrO2和SO42-/ZrO2要强；(2)引入适当数量的Ce2O3使得固体超强酸的酸强度增大；(3)当固体超强酸SO42-/ZrO2-Ce2O3的制备条件为焙烧温度550℃、焙烧时间4h、Ce2O3质量与ZrO2质量比2%时，酸对缩合反应的催化活性最高。

A fully ethoxy-terminated polymethylsilsesquioxane has been prepared via a dehydration ethanolysis reaction between absolute ethanol and an ordered ladder-like HO-Me-T, which improved long-term storage stability of HO-Me-T. Meanwhile, EtO-Me-T can still participate in the cross-linking reaction with hydroxy-terminated PDMS in the presence of catalyst.

利用含端羟基的LPS与无水乙醇之间的催化脱水反应合成了一种乙氧基为末端基团的活性梯形聚甲基倍半硅氧烷，有效地改善该类聚合物的长期稳定性；同时，该乙氧基封端聚合物仍然具有活性，可以代替常用的正硅酸乙酯与羟基硅油进行交联反应。

II. Oxidation of α,β-Unsaturated Ketones with Hypervalent Iodine Reagent Literatures reported that lead acetate-borontrifluoride etherate (LTA/BF3-Et2O) can transform α,β-unsaturated ketone to β,γ-unsaturated carboxylic acid ester through an one-step oxidative rearrangement reaction. Our research along this line indicated that hypervalent iodine reagents can also affect the same reaction.

II。 高价碘对α，β-不饱和酮之氧化研究先前已有文献指出用leadacetate-borontrifluoride etherate (LTA/BF3-Et2O)做氧化剂，可以经由一步的重组氧化反应把α，β-不饱和酮(α，β-unsaturated ketones)氧化成β，γ-不饱和碳酸酯(β，γ-unsaturated carboxylic acid esters)衍生物。

Using ethyne as source gas, CNTs were successfully synthesized by CVD method. By comparing different synthesis technics, the influences of parameter to the grow of CNTs, such as catalysts, growth time, reaction temperature and ratio of all kinds of carrier gases were investigated. The results showed that the influence of carrier gas, reaction temperature, and the growth time on synthesis of CNTs was significant. In conclusion, a better condition for carbon nanotube growth was obtained. Through analyzing Raman Spectrum of samples, GM and SWNTs' characteristic peak-RBM was indicated.

采用乙炔为碳源、氢气和氩气为载气，利用气相催化热解法在AAO模板上成功的制备出了纳米碳管，用TEM，SEM，EDS，Raman等表征方法研究了生长温度、裂解时间、载气含量和不同催化剂对碳纳米管的石墨化程度、产物形态的影响，指出了单壁碳纳米管的特征振动模式—径向呼吸振动模以及拉伸振动模式G模，缺陷导致的D模，并采用蒸金后的样品进行了场发射的测试，得到了F-N曲线，与理论符合较好。

Methanol-to-olefins belonged to high exothermal reaction. The overall reaction heat was within 20~35KJ/mol and the adiabatic temperature rise was more than 200 degree if the feed was only methanol.

如果以纯甲醇进料，总反应热一般在20～35KJ/mol之间，绝热温升在200℃以上，属于强放热反应。

Airtight reaction chamber method was used to investigate the effects of formaldehyde pollution on Vicia faba stomata reaction.

方法］采用密闭反应仓法研究蚕豆叶片气孔对不同浓度甲醛污染处理的响应。

4Complications:After operation peritonitis appeared in 5cases,among which were 2of intestinal obstruction,and 1 necrosis of left hemicolon.Conclusion:The chemotherapy of selective arterial drug perfusion before an operation reduce the tumor and stiumulate inflammatory reaction and fibroplastic proliferation around it.Thus increases excision rate as well as decreases local recurrence rate and possiblity of cancer merastasis.However,it also leads to some toxic side reaction and possible intestinal obstruction and necrosis.

于直肠癌手术切除前先行选择性动脉药物灌注化疗，可使肿瘤缩小，并刺激瘤周炎性反应和纤维组织增生，从而提高手术切除率，降低术后局部复发和远处转移可能，该方法有一定的毒副反应和发生肠梗阻、肠坏死的潜在危险。

The degradation of fluorobenzene by using ozonation process was studied, and the influences of pH value, initial concentration of fluorobenzene, ozone flux and reaction temperature on the reaction kinetics were investigated.

采用臭氧法降解含氟苯模拟废水。研究了氟苯降解的影响因素和动力学，考察了反应液初始pH值、反应物初始浓度、臭氧投量、反应温度对臭氧氧化降解氟苯反应速率的影响。

I was up all night because I was in pain, she said.

我整夜，因为我在疼痛，她说。

A crow caws /craoks.

乌鸦叫。 51-论文网