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- 与 reaction rate 相关的网络例句 [注:此内容来源于网络,仅供参考]
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The third part of this thesis is reactive simulating calculation In this section, some well-known auxiliaries are selected to compute in density functional theory B3LYP on Gaussian 03, from which the relationship between reaction active energies of transition states and enantiomeric excess of chiral products homoallylic alcohols isobtained based on relative reactive ratio theory. Using this relationship, calculations on the reaction of more than eight auxiliaries with four other aldehydes are carried out in AMI and MNDO, proving that N,N\'-dibenzyl tartamide has higher enantioselectivity than others in this reaction.
第三部分为计算化学部分,运用密度泛函理论B3LYP方法在Gaussian03软件上对已经报道的几种手性配体参与的醛不对称烯丙基化反应过程进行模拟计算,基于相对反应速率理论找出两种构型过渡态间活化能的差异与产物光学收率之间的关系;并以此为基础,用AM1和MNDO方法对上述合成的几种配体控制的反应过程进行量化计算,从而在理论上证实了N-苄基酒石酸二酰胺配体在醛的不对称烯丙基化反应中具有较高的立体选择性。
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Utilizing 6 and several kinds of diazides prepared in our lab, polys containing 1,2,3-triazolyl and perfluorocyclobutane units were synthesized by "Click chemistry". Utilizing the polycondensation reaction between 6 and several commercially available aromatic diphenol or copolymerization reaction after adding another active aromatic dichloride, fluorinated polys containing phenylphosphine oxide units were synthesized. Utilizing the polycondensation reaction between 6 and several commercially available aromatic dianhydride, fluorinated polys containing PPO units were synthesized.Secondly, structure characterization of fluorinated polys.
利用化合物6同各种自制的二叠氮化合物,通过&Click chemistry&,合成了具有1,2,3-三唑环结构单元的全氟环丁基类聚芳醚;利用化合物22同各种商业化的芳香二元酚类化合物进行缩聚反应或者再加入另外一种活性芳香二氯代物进行三元共聚反应,制备了具有苯基氧膦结构单元的含氟聚芳醚;通过化合物25同各种商业化的芳香二元酸酐类化合物进行缩聚反应,得到了具有PPO结构单元的含氟聚醚酰亚胺。
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The reaction performance of Pt-Sn-Li/Al_2O3/FeCrAl catalyst was measured,and the properties of the catalyst were characterized.It was found that reaction temperature,LHSV and the molar ratio of hydrogen to alkane have greatly affected on the catalytic performance of the Pt-Sn-Li/Al_2O_3/FeCrAl catalyst.Under a set of optimal reaction conditions,at 0.1 MPa,470℃,the molar ratio of hydrogen to alkane of 4 and LHSV of 0.14 mL·m~(-2)·h~(-1),the dodecane conversion is 6%,and the dodecene selectivity is about 72%.
结果表明:工业催化剂的催化性能比至今实验室制备的γ-Al_2O_3和SBA-15颗粒负载型颗粒状催化剂的性能好;反应温度、液时空速和氢烃摩尔比对Pt-Sn-Li/Al_2O_3/FeCrAl金属基整体式催化剂脱氢性能都有重要影响,最适宜的反应条件是压力为0.1 MPa,反应温度为470℃,进料氢烃摩尔比为4和LHSV为0.14 mL·m~(-2)·h~(-1),此时十二烷的转化率约为6%,十二烯的选择性约为72%;活性组分涂层与金属基体结合良好。
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In this paper, synthetic process of PTT and cationic dyeable PTT was studied, including molar ratio, catalyst concentration, reaction time and temperature, types of antioxidants in the esterification reaction and the condensation reaction.
研究了聚对苯二甲酸丙二醇酯、阳离子染料可染PTT的合成工艺条件中各因素对酯化及缩聚反应的影响,包括单体物质的量比、催化剂浓度、反应时间和温度、抗氧剂种类等。
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He best reaction conditions of TMAA were as follows: p-benzenediol as the polymerization inhibitor and the amount 1% of acrylic acid, reaction temperature 180 ℃,reaction time 3 h, raw material mass ratio of methyl eleostearate /acrylic acid 1:0.247 and the yield of TMAA was 85%.
MAA的最佳合成条件为:反应温度180℃,反应时间3 h,桐酸甲酯和丙烯酸的质量比为1:0.247,阻聚剂对苯二酚的加入量为丙烯酸质量的1%,产率为85%。
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Thirdly,in the view of some different results between the reaction of complexes(2)、(3)and[(Me_3Si)_2N]_3LnLi_3 with aromatic aldehydes, the reaction of 2 equiv of aromatic aldehydes with 1 equiv of lithium amide(1) catalyzed by the YCl_3 was subsequently studied,and better yields of the corresponding amides and alcohols can be isolated.These results indicated that the enolate ligand in complexes(2)、(3)may have impact on the Cannizzaro disproportionation reaction.
第三,鉴于上述配合物2、3和[(Me_3Si_2)2_N]_3LnLi_3与芳香醛反应结果上的一些差别,我们又以三氯化钇为催化剂,将两当量的芳香醛与一当量化合物1的锂盐直接进行反应,结果以较好的产率得到了相应的酰胺和醇,这说明配合物2、3中所含的乙烯醇基可能对此Cannizzaro-型歧化反应存在一定的影响。
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Reaction of synthesizing polyester commonly including three parts: esterify reaction, early polycondensation and sequel polycondensation. This paper only discusses two of them: esterify reaction and sequel polycondensation.
合成聚酯的反应一般分为三个部分进行:酯化反应部分、预缩聚部分和终缩聚部分,本文对酯化部分和终缩聚两个部分进行研究。
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To improve the selectivity, the Co/Mn/Br catalyst system with ethanal as an additive was studied and the reaction conditions were also optimized, which were as follows:the amount of ethanal 10%(mole ration base on the substrate), reaction temperature 100℃,reaction time 30min,the oxygen pressure 0.2MPa, the amount of the composite catalyst Co/Mn/Br 7%,the mass ration of different ingredients 2:2:1. Under these conditions, the yield comes to 24.10% and the selectivity reaches 75.03%.
为了提高反应的选择性,论文初步研究了以乙醛作为添加剂条件下各工艺参数的影响,并进行正交优化,得出最佳条件为:乙醛加入量1:10,反应温度100℃,反应时间30min,氧气压力0.2MPa, Co/Mn/Br混合催化剂加入量7%,质量比2:2:1,在此条件下,反应产率为24.10%,选择性可达75.03%。
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The expressions of current density and the Faradaic Impedance for the three-step electrode processes involving chemical adsorption,charge transfer and desorption steps in the presence or absence of a chemical competitive reaction have been derived in terms of linear condition in this paper,by which the effect of the chemical competitive reaction on the main reaction was analyzed.
在线性条件下,推导了由化学吸附、电荷传递、化学脱附三步骤的电极过程在有化学竞争反应条件下的电流密度和法拉第阻抗的表达式,分析了不同条件下化学竞争反应对主反应的影响,并使用等效电路对可能出现的阻抗结果进行了理论描述。
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Skin stimulation test and implantation in vivo found no abscess and fistule formation. Histological section showed there was moderate inflammatory reaction of forign object exciation at the early stage of implantation. At the intermediate stage, inflammatory cells decreased, mainly including lymphocytes, and there was little inflammatory reaction and antigen reaction. Meanwhile, SIS degraded sequently. At 12 weeks, SIS was almost completely degraded and absorbed.
皮肤刺激试验和体内植入研究发现,无脓肿及瘘管形成,组织切片发现SIS植入后组织反应在早期呈现出异物刺激引起轻中度炎性反应,中期时炎症细胞减少,以淋巴细胞为主,炎症反应和抗原反应都较小,同时进行程序性的降解。12周时SIS几乎完全降解吸收。
- 相关中文对照歌词
- Delayed Reaction
- Reaction To Action
- Chain Reaction
- Delayed Reaction
- My Heart Rate Rapid
- Nuclear Device
- Lights, Camera, Action
- Hollywood
- Chain Reaction
- No Reaction
- 推荐网络例句
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As of Tuesday, Google's results were still censored in China.
截至周二,谷歌的搜索结果仍受中国审查。
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In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.
在这一过程中,人的主体性发挥是社会有机体健康发展的灵魂。
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Objective To investigate the relationship between the telomer ase activity and apoptosis in gastric cancer.
目的为了探讨胃癌组织中端粒酶与细胞凋亡的关系。