查询词典 reaction formation

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。

A large number of bond-type complexes, as long as the hydrogen of the molecules covalently coupled to the molecular approach in an electronegative atom up, that constitutes a hydrogen bond, there are intramolecular hydrogen bonds and intermolecular hydrogen bonds of the points, will affect the formation of complex reaction carried out, such as in solution adding dioxa cyclohexane, or tetrahydrofuran, will reduce the alkylation reaction rate.

氢键型络合物为数众多，只要含氢的分子以共价键方式耦合到分子中一个电负性原子上去，即构成氢键，有分子内氢键和分子间氢键之分，络合物的形成将会影响反应的进行，如在溶液中加入二氧杂环己烷或四氢呋喃，都会降低烷基化反应速率。

ResultsMacroscopic examination showed no excrescence,thrombus formation,arm fractures and corrosion.The devices were covered with collagen fibrosis and discrete endocardial cells,apparent inflammatory infiltration in the devices and around the devices 1 month after implantation.The implants were nearly endothelialized,while the inflammatory reaction relieved gradually,with myocardial cells ingrowth at the edges of the device 3 months after implantation.The devices were completely covered with endocardium and fibrous tissue.Moreover,endothelial cells could be found on the smooth microscrew adaptor.The inflammatory reaction diminished with a few chronic inflammatory cells existing.Neovascularization and lymphatic vessels ingrowth could be observed 6 months after implantation.

结果所有封堵装置表面均没有发现赘生物、血栓形成、支架发生断裂及被腐蚀；术后1个月，封堵装置表面被胶原纤维和散在内皮细胞所覆盖，大量炎症细胞浸润，封堵装置边缘有小灶性炎症细胞浸润；术后3个月，封堵装置表面几乎被内皮细胞所覆盖，炎症细胞较1个月时明显减少，封堵装置内见纤维化，封堵装置边缘心肌细胞浸入；术后6个月，封堵装置表面完全被心内膜和纤维组织所覆盖，伞尖表面光滑并有内皮细胞上爬，炎症反应明显消散，但仍有少量慢性炎症细胞存在，装置内有新生的血管、淋巴管长入。

The effect of the addition of the crystal seed in the jarosite preciptation was investigated and the results showed that the crystal seed would accelerate the crystallizing rate of jarosite formation, which convert the reaction mechanism from the crystallization kinetic rate control into the chemical reaction kinetic control.

阐述了晶种加入对沉矾影响的过程机理，认为晶种的加入加快了沉矾反应的结晶速度，使反应由结晶的动力学控制过渡到化学反应动力学控制，足量晶种加入情形下沉矾过程的活化能为94.66KJ／mol，表明了氯化物体系铁矾沉淀较硫酸盐体系中更易进行。

The influences of reaction temperature, reaction time and the ratio of reactants on the formation of lead carbonate crystallites were investigate.

通过实验确定了解制备碳酸铅的最佳工艺条件：反应温度为 95℃，反应时间为 5 h，反应物浓度为0 。5 mol/l，反应物配比为 1∶ 6。

Increasing reaction temperature can not only promote the formation of mercaptan and other sulfide compounds, but promote hydrogenation and isomerization reaction of 1-hexene.

温度的升高促进硫醇及其它硫化物的生成，同时还会促进1-己烯的饱和及异构化反应。

Under the condition of the ratio of Fe~(2+)to Fe~(3+)and NaOH molarity constant,the effect of variation of main technological parameter such as reaction temperature,mixing speed,reaction time,pH value on Fe_3O_4 magnetic particle formation,shape and particle size was researched by the orthogonal experiment.

在Fe~(2+)、Fe~(3+)铁盐配比及NaOH摩尔浓度一定的条件下，用正交实验考察了反应温度、搅拌转速、反应时间、pH值等主要工艺参数的变化对Fe_3O_4磁粒子的形成、形貌及粒径的影响。

Biocompatibility of tissue and material: All the materials used in operation were interstitial implant of titanium alloy. To the end of follow-up, there were no reaction of blood, immunization and tissue, no peplos formation or changes in cytoplasm, and no reaction of materials such as alloy corrosion and worn out.

材料与组织的生物相容性反应：术中所用材料均为钛合金体内植入物，与人体组织的生物相容性好，到随访结束时，无血液、免疫、组织等反应，无囊膜形成及细胞质的转变；亦无钛合金腐蚀、磨损等材料反应的发生。

XRD and SEM analysis showed that the main composition of the white substance which formed in cracks is CaCO3, which can block cracks and is probably the main cause of self-sealing. Two processes which called surface reaction process and diffuse reaction process are defined in the formation process of CaCO3.The phenomenons in self-sealing experiment can be explained by those two processes.

对试件裂缝中沉积的白色物质做SEM、XRD分析得出其成份主要为CaCO_3，CaCO_3堵塞裂缝应该是引起自愈现象的主要原因；CaCO_3的生成包括表面反应和扩散反应两个阶段，这在一定程度上解释了自愈现象先快后慢和自愈幅度砂浆＞混凝土＞净浆。

Master the Keto-Enol tautomerism; reactions of enols:α-H substitution reactions;α-halogenation of aldehydes and ketones;α-bromination of carboxylic acids; acidity ofα-H atoms: enolate ion formation; reactivity of enolate ions; alkylation of enolate ions; mechanism of carbonyl condensation reactions;condensations of aldehydes and ketones: the Aldol reaction; dehydration of Aldol products; the Claisen condensation reaction; the Michael addition.

熟练掌握酮式－烯醇式互变异构；烯醇的反应：α-H的活性；醛酮的α卤代反应；羧酸的α-溴代反应；α-H的酸性：烯醇负离子的形成；烯醇负离子的反应；烯醇负离子的烃基化；羰基化合物的缩合反应机理；醛酮的缩合反应－Aldol缩合；Aldol缩合产物的脱水反应； Cleisen 酯缩合反应；麦克尔加成反应。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。