Ethrel was synthesized from byproduct hydrochloric acid of chlorinated methane, and effect of temperature, time and impurity of hydrochloric acid on the yield of ethrel was discussed.
采用甲烷氯化物副产盐酸制备了乙烯利，讨论了反应温度、时间以及副产盐酸杂质含量对乙烯利收率的影响。
It shows that runoff is closely correlated with the features of individual precipitation, and it is also affected by vegetation within a short period of time. Raindrop erosion, sheet flow erosion and rill erosion on the slope are the main soil erosion patterns; sediment yield occurs mainly in flood season. Human activity and individual precipitation are two important factors that control the soil erosion at a small watershed. Comprehensive management on the slope in a small watershed is an efficient measure of water and soil conservation.
分析表明，小流域的产流方式容易随次降雨条件的变化而变化，植被因素在较小时间尺度内就会影响产流；产沙主要来源于坡面上的溅蚀、片蚀和细沟侵蚀，时间主要集中在汛期；人类活动以及次降雨条件是控制小流域侵蚀产沙的重要因素；在小流域内进行坡面的综合治理是水土保持的有效措施。
The alkali dosage depends mainly on the constituents and property of material and the quality requirements for pulp: more alkali dosage will speed up cooking process, reduce the hardness of pulp and improve the bleachability of pulp; but excessive alkali dosage will lower the pulp yield and physical intensity, while too less alkali dosage will result in harder and darker pulp, uneasy to bleach, too much screenings, and even extending cooking time cannot guarantee the reaction of delignification.
用碱量主要取决于原料的组成和性质及对纸浆的质量要求：加用碱量有利于加快蒸煮速度降低纸浆硬度和提高纸浆的可漂性：但过高却会降低纸浆得率和物理强度，如过低时，成浆较硬而色暗，不易漂白而且筛渣多即使延长蒸煮时间也难以保证脱木素反应进行。
Effects of ratio of sodium allylate to epichlorohydrin, reaction temperature and time and way of adding materials on the yield of allyl glycidyl ether were investigated.
讨论了原料摩尔比、反应温度、反应时间、投料方式等因素对反应收率的影响。
At the same time, the prescription inspection of the powder pellets study the nature, yield and in vitro dissolution rate measured in Ciwujia pellets (according to isofraxidin dollars) content.
同时考察了处方微丸的粉体学性质，收率和体外溶出度，测定微丸中刺五加含量。
Yield monitor system installed on combine harvester is the best way to carry out corn yield measurement real time.
为实现谷物产量的实时测量，将测产系统搭载在联合收割机上是最好的选择。
Compared with spread application, bag-controlled fertilizer treatment increased chlorophyll content of leaf significantly, and the density of fine root in fertilized region. The shoot stopped growth at proper time and it was benefit for nutrition cumulation and organ differentiation, so it increased yield and quality of peach significantly.
与散施处理相比，肥料袋控缓释处理能显著提高叶片叶绿素含量，增加施肥区细根密度，并且桃树新梢能适期停止生长，有利于营养的积累与器官的充实分化，从而显著提高了果实产量与品质。
The 2-oxo-4-phenylbutanate was prepared from ethyl 3-phenylpropionate firstly, and orthogonal experimental design was used to optimize the reaction conditions as follows: molar ratio of ethyl 3-phenylpropionate to diethyl oxalate was 1:3, condensation reaction time was 2.5 h, concentration of H2SO4 was 20%, hydrolysis reaction time was 15 h, and the yield of L-HPA was 68.24% under the optimized conditions.
以苯丙酸乙酯为原料，通过正交设计优化2-氧－4-苯基丁酸盐的制备条件：苯丙酸乙酯与草酸二乙酯摩尔比为1：3，缩合反应时间为2.5 h，H2SO4质量分数为20%，水解反应时间为15 h，优化条件下2-氧－4-苯基丁酸盐的产率为68.24%。
In this paper, titanium ethoxide was synthesized by the direct electrochemical method. The production was characterized by Raman spectra. The effects of different factors on the voltage, current efficiency, material yield and space-time yield were investigated.
采用直接电化学法合成乙醇钛，采用激光拉曼光谱对产物进行了表征，详细探讨了电解时间、电流密度、支持电解质浓度、电解液温度以及电极间距对槽电压、电流效率、产物收率和时空产率的影响。
Simulation results show that cellulosic material is constrained in a middle temperature condition during a rather long period of time, since heat transferred from the surrounding can not meet the endothermic need of primary cracking reaction, which virtually forms the essential condition for biomass pyrolysis to yield bio-oil.
结果发现纤维素热裂解过程中，由于一次反应吸热需求得不到满足，导致物料温度长时间内处于中温状态，恰好形成了生物质热裂解制取生物油保持中温的必要条件。
But producing ethanol is time-consuming and expensive, and has a low yield of energy.
但是生产乙醇费时间、成本高，而且产生出来的能量较低。
Under different conditions, acetic acid conversion and the yield of butyl acetate were close or reached to 100% in a short operating time.
在不同反应条件下，较短的反应时间内，乙酸的转化率、乙酸正丁酯的产率都能接近或达到100%。
At the same time it adopts lower mixing ratio of solfonating agent, and can effectively control sulfonation reaction, so that it can further raise the yield.
同时由于采用较低的磺化剂配比，故又可有效地抑制深度磺化，产品收率也因此而得到进一步提高。
Methods The orthogonal test was conducted to test the effect of the temperature of extraction, time of extraction, concentration and volume of ethanal on extracts yield and the content of hypericins and and total flavonoids from Hypericum perforatum L., and optimize the extraction technology.
方法以总金丝桃素含量、总黄酮含量及浸膏得率为指标，采用正交试验法对提取过程中提取温度、提取时间、乙醇浓度及乙醇用量4个因素进行优选研究。
The influences of the different temperatures, reaction time and solvent volumes on the crystal yield were also discussed.
以1，3-二亚胺基异吲哚啉和二水乙酸合铜为起始原料时，发现合成酞菁铜晶体的产率最高，为52.3％；最佳的反应条件是：反应温度为270℃，反应溶剂为10 ml，反应时间为8 h。
The optimum process conditions of the second reaction are: dropping time of oxidizer is 2 hour, reaction time is 4 hour, reaction temperature is 25℃ and the yield is 86.6%.
第二步氧化反应，通过单因素优化实验确定较佳的反应条件是：滴加氧化试剂2小时，滴加完后反应4小时，反应温度-5℃，收率可到86.3％。
The effects of temperature, time, EtOH consistency and stock ratio on extraction yield of 4 kinds of triterpene acid s were investigated by orthogonal test.
以科罗索酸提取率为指标，通过正交试验考察了枇杷叶中4种三萜酸提取效果的影响因素，其最佳提取条件为：温度80℃，提取时间3。
ResultsThe optimum synthetic conditions were 2 g cinnamic acid, microwave power was 600 W, reaction temperature was 115℃, reaction time was 14 min, mass percent of macroporous resin was 30%, the molar ratio of cinnamic acid to isobutyl alcohol was 1:7, and the yield of the new process was 89.3%.
结果肉桂酸2 g，酸醇摩尔比1∶7，催化剂用量30%，微波功率600 W，微波温度115℃，微波时间14 min，转化率达89.3%。
The effect of charging material method for etherification on yield of II, the effects of the mole ratio between chlorosulfonic acid and II as well as the reaction time for sulfonation on the yields of I were investigated.
研究了醚化反应投料方式对全氟壬烯基苯酚醚收率的影响，氯磺酸和全氟壬烯基苯酚醚的配比以及反应时间对磺化反应收率的影响。
It showed that the ammonium ferric sulfate dodecahydrate was an excellent catalyst, the yield of the n-butyl lactate could reach over 95.0% under molar ratio of n-butyl alcohol and lactic acid 2.25∶1, the reaction temperature of 110～125℃, reaction time of 1.5 h and amount of the ammonium ferric sulfate dodecahydrate catalyst of 2.5%.
实验表明：NH4Fe(SO4)212H2O是合成乳酸正丁酯的良好催化剂。最佳反应条件为：醇酸物质的量比2.25∶1，催化剂的用量为反应物料总量的2.5％，酯化反应时间为1.5 h，反应温度110～125℃，酯化率可达95.0％。