助手标题
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
共[19]条 当前为第1条到19条
 

相关语句
未完全匹配句对
    Results indicated that the purity is 94.67% with the yield up to 68%.
    由高效液相法测得纯度为94.67%,收率达到68%。
    This compound efficiently catalyzed the direct asymmetric aldol reaction with the yield up to 90.0% and enantiomeric excess up to 89.5%.
    该化合物对映选择性催化直接羟醛反应,产率最高达到90.0%,对映体过量最高达89.5。
    Two new azoxybisbenzocrown ethers were synthesized. Preparative method of azo-xybisbenzo-15-crown-5 has been improved with the yield up to 65.3%.
    合成了两种新的氧化偶氮双苯并冠醚,改进了氧化偶氮双苯并15-冠-5的制备方法,使其收率提高到65.3%。
    Current cultivation objective of super rice in China is to make the yield up to 10500kg/ha in small area.
    在全国各地出现水稻小面积产量达到10500kg/ha,是我国目前超级稻的栽培目标。
    After adopted procedure the yield up to 90% and cost reduce 20 yuan/mg.
    采用此工艺后收率提高到90%,成本下降20元/公斤。
    Experimental results indicated that the optimum conditions of esterification reaction are the molar ratio of o-phthalic acid, n-butyl alcohol and sodium hydrogen sulfate 1:2. 6:0. 22, the reaction time 1. 5 h,and the yield up to 94.24%.
    实验结果表明:酯化反应的优化条件为邻苯二甲酸、正丁醇、硫酸氢钠物质的量比为1:2.6:0.22,反应时间1.5h。 产率可达94.24%。
    The results showed that regressionequation could anticipate the yield up to 4.1%~4.6% at 27MPa, 35℃ by the figure of response surface.
    结果表明:回归方程能较好预测萃取得率; 通过响应曲面分析预测在27MPa,35℃条件下,紫草萘醌得率为4.1%~4.6%。
    The optimal conditions was obtained by orthogonal experiment as follows: n(NaNO 2)∶n(6-APA)=2∶1, m(PEG-400)∶m(6-APA)=0.08∶1, n(Br 2)∶n(6-APA)=2.0∶1, reaction temperature 8~12 ℃, reaction time 4 h with the yield up to 95% and purity 97%.
    通过正交实验得到最佳反应条件为 :n(NaNO2 )∶n(6 APA) =2∶1; m(PEG 4 0 0 )∶m(6 APA) =0 .0 8∶1;
    Experimental results indicated that the optimum conditions of esterificationreaction are as follows: the mole ratio of oleic acid, n-butyl alcohol and p-toluene sulfonic acid 1∶2∶0.15, the reaction time 70 minand the yield up to 93.92%.
    实验结果表明,酯化反应的优化条件为油酸、正丁醇、对甲苯磺酸摩尔比为1:2:0.15,反应时间70min,产率可达93.92%。
    This compound efficiently catalyzed the direct asymmetric aldol reaction with the yield up to 90.0% and enanti- omeric excess up to 89.5%.
    该化合物对映选择性催化直接羟醛反应,产率最高达到90.0%,对映体过量最高达89.5%.
    The factors influencing reaction were discussed. The results indicated the optimum conditions of esterification reaction are the molar ratio of hexanoic acid isopentanol and phsphotungstic acid pure 1:3:0.00024,the reaction time 40min,and the yield up to 98.92%.
    考察了影响反应的因素,实验结果表明酯化反应的最佳条件:己酸、异戊醇、磷钨酸的摩尔比为1∶3∶0.00024,反应时间40min. 产率可达98.92%.
    SO~(2-)_4/TiO_2-MoO_3 is an excellent catalyst for synthesizing butyraldehyde 1,2-propanediol acetal to improve the yield up to(87.5%).
    最佳反应条件为:丁醛与1,2-丙二醇摩尔比(n丁醛∶n1,2-丙二醇)为1∶1.5,催化剂用量为反应物料总质量的0.5%,环己烷为带水剂,反应时间45 m in。 上述条件下,SO42-/TiO2-MoO3是合成丁醛1,2-丙二醇缩醛的良好催化剂,其得率可达87.5%.
    The factors of influencing reaction were investigated. Experimental results indicated that the optimum conditions of esterification reaction are:the molar ratio of acetic acid and p-cresol and p-toluene sulphonic acid supported on active carbon is 1∶2∶0.064,the reaction temperature is 130~150 ℃,the reaction time is 30min,and the yield up to 95.87%.
    考察了影响反应的因素,实验结果表明酯化反应的最佳条件:乙酸、对甲苯酚、活性碳负载对甲苯磺酸的摩尔比为1∶2∶0.064,反应温度在130~150℃,反应时间30 m in,产率可达95.87%。
    When the amount of catalyst was 5 mol% relative to aldehyde, solvent was toluene and reaction temperature was -10 ℃, the chiral ligand, 1S,2R-(+)-2-amino-1,2-diphenylethanol (1b), efficiently catalyzed the asymmetric ad- dition of diethylzinc to aldehydes with the yield up to 100% and enantiomeric excess up to 85%.
    当催化剂用量为5%、甲苯溶剂、在-10℃下、以(1S,2R)-(+)-2-氨基-1,2-二苯基乙醇(1b)作催化剂时,所得仲醇的对映体过量最高为85%ee,产率高达100%.
    It is an optimal sandy soil organic prescription,with the yield up to 30.11 t/hm~2,and the T_2 treatment with sheep manure mixture and sandy soil ratio of 0.5∶1 can provide suitable content of available N,P and K in the substrate,hence high yield and quality,proving its value of extension.
    羊粪与沙化土体积比0.5∶1配方(T2处理)在甜瓜生长发育前期速效氮、速效磷、速效钾含量较适宜,产量较高,品质较好,具有一定的推广价值。
    The optimal conditions obtained by the orthogonal design experiment for the esterification reaction with the yield up to 62% is that reaction time 55 min,reaction temperature 70℃,catalyst amount 110 g/L and reactants molar ratio of ethanol to acetic acid 1.5∶1.
    通过正交实验得到优化反应条件:反应时间为55 min,反应温度为70℃,催化剂用量为110 g/L,醇与酸摩尔比为1.5∶1,乙酸乙酯收率可达62%。
    Cu-Zn-Ti catalysts exhibited good catalytic activity in the hydrogenation of maleic anhydride toγ-butyrolactone with the yield up to 98%.
    Cu-Zn-Ti是优良的顺酐气相加氢催化剂,且γ-丁内酯收率最高可达到98%。
    Benzylamine could be obtained in mild condition by this method and the yield up to 84.1% was obtained. This method is a good method for industrial.
    以苄氯为原料,苯甲醛做副反应抑制剂合成苄胺,在温和条件下同样可达到高收率(84.1%),是一种具有工业化前景的方法。
    Adopting changed seeding model, which inclues a series of agronomy practices such as plouthing and levelling the fields, etc can improve the early stage developmant, promote the community forming of the alfalfa and increase the yield up to more than 600kg/mu. with reasonable irrigation and fertilization, on the above, basis the yieds of alfalfa may reach 1000~1200kg/mu. increased by 140~380%.
    采用早期丰产技术并辅之以合理灌溉、施肥等农艺措施后,可促进苜蓿早期发育,缩短建群阶段,亩产量可提高到1000~1200公斤,增产140~380%,并使苜蓿提早三年进入产量盛期。
 

首页上一页1下一页尾页 

 
CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社