反应物

In this paper,2,2-dimethylolbutyraldehyde was synthesized through the acetal reaction of formaldehyde and butyraldehyde,using phosphomolybstic acid as catalyst.

研究了磷钼酸对此缩醛反应的催化反应活性，以及催化剂的用量、反应物配比、反应时间等因素对反应产物收率的影响，确定了最佳催化条件。

The potassium and phosphorus extraction rates are studied for the reactive system consisting of natural potash feldspar ,phosphate rock and phosphoric acid,with the analysis on reactants and resultants by XRD and FTIR.

分析了钾长石、磷矿、磷酸不同组合反应体系的钾、磷溶出率，并用XRD和FTIR对反应物和产物进行了物相分析。

On the single PES, the initial adduct of the reactant is barrierless and released lots of energy available for further reaction.

在单重态势能面上，反应物通过无能垒过程形成最初的加成物，最初形成的富能的中间体能进一步发生断裂和异构化反应。

The effects of acidity, reaction temperature, feeding mode, and rotational speed of the stirrer on the particle size of AC blowing agent were studied. The optimal conditions were obtained as follows: the catalyst composed with m:m(V2O5)=1:1 equal to 1%-2% ratio of the reagent''s mass,reagent reacts at 50℃ under pH=3-4 for 25min with 350～360r/min of the stirrer speed, and the NaClO3 solution must be added from burette.

研究了酸度、反应温度、加料方式、搅拌器的转速对AC发泡剂粒径的影响，最佳工艺条件为：催化剂m：m(V2O5)=1：1的质量约为反应物质量的1%~2%，反应体系的pH值3～4，反应温度控制在50℃左右，氯酸钠溶液(质量分数20%)采用通管滴加的方法加入，整个反应时间约为25min，搅拌器的转速一般控制在350～360r/min。

The effect of the mole ratio reactant, reaction temperature, reaction time , catalyzer on the each reaction were studied.

研究反应物配比、反应温度、反应时间、催化剂用量对各步反应的影响，得到最佳反应条件。

Moreover, DSC results indicated that the equivalent reactant ratio gave rise to the complete chain-extending, and the highest molecular weight and tensile strength of the copolymer was present.

另外DSC结果发现，合成共聚物的原料配比对材料的结构和性能有影响，反应物以等摩尔当量配比时，样品的扩链反应最完全，相应的分子量也可能最高，同时抗张强度最高。

In this section the best initial concentration of the reactant and the most suitable ratio of nZn(NO32 ∶nTi(SO42 were determined by the calculation of the recovery rate, heat analysis, TEM analysis and XRD analysis.

在此基础上对纳米ZnO-TiO2复合粉体的制备进行了深入研究，通过回收率的计算和差热、TEM及XRD等各种表征实验确定了最佳反应物初始浓度及合适的nZn(NO32 ∶nTi(SO42 反应物配比值。

Two representative compounds have been determined by X-ray crystallography. The best ratio of reactants, the adequate reaction temperature and solvent have been found by contrast experiments.4. The better photoreaction conditions and irridation times have been confirmed through the different photoreaction results. It is the first time that fifty quinazoline derivatives with biological activity and four photooxidation products with urea functional groups have been obtained by photochemistry method. Two representative compounds, quinazoline derivatives and photooxidation products, have been determined by X-ray crystallography, respectively.

通过实验对比我们找到了较佳的反应物的投料比、反应温度和反应所用的溶剂。4、根据不同条件下的光反应结果，确定了硫脲衍生物的相对较好的光反应条件和光照时间，首次利用光化学手段成功得到50个具有生物活性的喹唑啉衍生物和4个具有脲基官能团的光氧化的产物，测定了两个具有代表性的喹唑啉和光氧化的产物的晶体结构。

Some relative characters of reverse micro emulsions of reacting substance/AOT/iso-octane were studied. The phase graphs of the reverse micro emulsions at different temperatures were drawn. And the charts of relationship between conductivity of the reverse micro emulsions and the solubility of H2O or the solution of RDX in them were also done. On the base of them as well as characters and rules of preparation of nanometer materials by the method of micro emulsions, the best conditions were found in the preparation of the reverse micro emulsions.

论文摘要本文首先对反应物/AOT/异辛烷微乳液体系进行了研究，得出了该体系在不同温度下的相图和微乳液体系电导率与反应物的增溶量之间关系图，结合纳米材料微乳液制法的原则和特点，确定了微乳液配制的最佳条件。

The thermolysis electrocyclic reaction was affected significantly by the structuresof substrates, reaction temperature and time as well as Lewis acids and organic acids.

通过对反应物的结构、反应温度、反应时间、Lewis酸和质子酸的催化效果等诸多因素对该反应的影响进行探讨发现，在反应中使用1.1当量的三氟乙酸时，不仅反应时间可以缩短8-21小时，产率也可以提高20-30％。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。