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optimun conditions
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  最佳条件
     Under the optimun conditions, the yield could reach 88.5%
     在最佳条件下,草莓酯的收率可达88.5%。
短句来源
     The optimun conditions are as follows:The molar ratio of maleic anhydride to methane alcohol is 1∶6,the mass of silicotungstic acid is 8% of maleic anhydride,the reaction time is 6h. The yield of product can reach 94.4%.
     反应的最佳条件是:马来酐和甲醇的物质的量比为1∶6、催化剂用量为马来酐质量的8%、反应时间6h,产率达94.4%
短句来源
     The results showed that the optimun conditions of adsorption by protonated CHT are: pH in Cr(VI) solution was 3~4, the time of adsorption equilibrum was 10~12 hr, the concentration of Cr(VI) was not greater 60 mg·L -1 .
     研究结果表明,CHT质子化后吸附的最佳条件是Cr(VI)溶液pH3~4; 吸附平衡时间10~12小时;
短句来源
     The optimun conditions of preparation were obtained. The molar ratio of methanol to chloroacetic acid was 2.5∶1,the amount of S-PEKK was 8 g per molecular chloroacetic acid,the reaction temperature was 90~110 ℃,reaction time was 4 h,yield of the ester was 93%,S-PEKK exhibited good catalytic activity and could be used repeatedly.
     最佳条件 :醇酸摩尔比为 2 .5∶1,S -PEKK用量为 8g/mol氯乙酸 ,回流时间 4h ,反应温度为 90~ 110℃ ,酯化率可达 93%. S -PEKK具有催化活性好、可循环使用等特点 .
短句来源
     The optimun conditions were studied for extraction of pyrethroid pesticide in soil by accelerated solvent extractor.
     研究了用加速溶剂萃取仪提取土壤中菊酯类农药的最佳条件
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  “optimun conditions”译为未确定词的双语例句
     The optimun conditions of the cyclization reaction were found. Under the optimun conditions (20~70 ℃ and 1~4 h), the yields of 3a~3f were 35%~58%.
     对影响环化反应的温度和时间进行了优化,在优化条件20~70℃和1~4h下3a~3f的收率为35%~58%。
短句来源
     Under the optimun conditions, the conversion of oleic acid was 98%, the yield was 91%.
     优化条件下 ,油酸的酯化率 98%,收率 91 %。
短句来源
     Ti(SO 4) 2/SiO 2 was used as catalyst for the to esterification of oleic acid with butanol. The reaction conditions were studied. The optimun conditions were as follows:0.2 g Ti(SO 4) 2/gSiO 2 oleic acid 0.1 mol, butanol 0.2 mol, catalyst 1 g, reaction temperature 140 °C , reaction time 60 min.
     考察了 Ti(SO4 ) 2 /Si O2 在油酸丁酯合成反应中的催化性能 ,对影响酯化的条件进行了优化 ,优化条件如下 :0 .2 g Ti(SO4 ) 2 /g Si O2 ,油酸 0 .1 mol,丁醇 0 .2 mol,催化剂 1 g,反应温度 1 40°C,反应时间 6 0 min。
短句来源
     The capillary behaviour of Ca 2+ and Mg 2+ in supporting electrolyte of 2×10 3 mol/L EDTA and 1 5×10 2 mol/L borax was studied by high performance capillary electrophoresis. Under the optimun conditions of 200 nm,35℃ and 20 kV,Ca 2+ and Mg 2+ in the natural water were simultaneously determined in 5 min. A rapid and effective determination method was acquired for analysis of water quality.
     对Ca2+、Mg2+在含2×103mol/LEDTA和15×102mol/L硼砂载体溶液中的毛细管电泳行为进行了讨论,并在200nm、35℃、20kV的优化条件下,5min内对天然水中的Ca2+、Mg2+离子进行了同时定量,为分析水质硬度提供了一种高效、快速的测定方法。
短句来源
     The titer was increased by 20.29% from 64.11 μg/mL to 77.12 μg/mL when the strain was cultivated under the optimun conditions as compared with the control.
     最优发酵条件为:摇瓶装量100 mL/L,接种量8%,C aCO35 g/L(调节pH值),在温度28℃、发酵周期40 h的优化条件下,得到卑霉素的效价值为77.12μg/mL,较对照(64.11μg/mL)提高了20.29%。
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     The optimun conditions of digestion were studied.
     研究了消化煤样的最佳条件。
短句来源
     The optimun conditions are 50℃temperature;
     确定了牡蛎酶解的最佳工艺条件为:酶解温度50℃;
短句来源
     V.conditions.
     V条件.
短句来源
     Conditions of I.
     L(-1)/3562.5mg. L~(-1)条件下,在第15d收获为培养的最佳条件。
短句来源
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Based on Aldrich's method of separating rosin adducts from rosin mixtures, a methcd of separating rcsin-maleic anhydride adducts from maleic mcdified rosin and determining the content of the adducts has been devised. Optimun conditions for separation have been investigated. Separative adducts can be first extracted by methanol-heptane-water or methanol-petroleum ether (60o-90℃)-water system and then determined by titrimetry or gravimetry with an experimental error of ±2-6%.

本文根据Aldrich从松香混合物中分离松香加合物的方法,拟定从马来松香中分离测定马来酐加合物的方法。探讨了分离的最佳条件,提出了用甲醇—正庚烷—水或甲醇—石油醚—水体系预先萃取分离加合物,再用重量法或容量法测定加合物含量的方法。方法的相对误差为±2—6%。

Sea-sand distributed along the coast of southern Fujien is found to contain monatize and also together with titania, ferro-titania, zirconia etc. Constituents of rare earths which ivolved in the fine monatize obtained by flotation are mainly phosphates of cerium group as thier spectrogram shown.Process of usual preliminary decomposition of monatize in rare earths production is now adopted either by means of an acid treatment with concentrated sulfuric acid, or a base treatment with concentrated caustic soda...

Sea-sand distributed along the coast of southern Fujien is found to contain monatize and also together with titania, ferro-titania, zirconia etc. Constituents of rare earths which ivolved in the fine monatize obtained by flotation are mainly phosphates of cerium group as thier spectrogram shown.Process of usual preliminary decomposition of monatize in rare earths production is now adopted either by means of an acid treatment with concentrated sulfuric acid, or a base treatment with concentrated caustic soda solution. As for the bustnasite, it had been reproted while the mineral is ignited with soda as a cracking agent, the recovery rates of rare earth oxides and thoria from the mineral are similar to that from monatize by acid or base process mentioned above. They are all over 95%.In this paper, the authors deal with the soda process for decomposing monatize from Fujien at first, but fail to obtain a fair result. The recovery rates fo rare earth oxides and thoria are less than 30%. However, by adding fluorite as a flux with soda to the powderized ore in ignition, it is predominantly to promote the efficiency for leaching out the oxides from ignited mixtures by acid extraction.Optimun conditions of the procedure mentioned above are: (I) proportion of soda and fluorite to mineral by weight is 75% and 10-12% respectively, (2) ignition temperature-650℃, ignition time-1.5 hours, (3) acid leaching time-1.5 hours, leaching temperature-70-80℃, (4) concentration of acid (H_2SO_4 or HCl)-4N. The recovery rates of these oxides by sulfuric acid extraction or by hydrochloric acid extraction are greater than 95% or 98% respectively.Stock solution prepared in such way may be applied to production for preparing rare earths salts and thorium salts.

碳酸钠分解法处理含氟稀土精矿,稀土(钍)的浸出提取率与生产上常用的硫酸分解法或氢氧化钠分解法相同.用此法分解本省海滨砂矿的独居砂,稀土(钍)的浸出率低于30%.本文研究了以氟化钙作为独居砂的添加剂,模拟含氟稀土精矿的碳酸钠分解法进行了独居矿的分解试验.用稀硫酸或稀盐酸为浸出用酸,稀土(钍)的浸出率分别达95%和98%以上,浸出料液符合生产上的工艺条件要求.

The ac polarographic behavior of Eu + 3 ions in three base solutions (NH4SCN, EDTA-NaCl,DTPA-NaCl) has been compared. In DTPA-NaCl solution the polarographic reversibility of Eu(Ⅲ)is the best among them. The optimun conditions for the polarographic determination of Eu(Ⅲ)are: pH≥6.5, NaCl concentration≥0. 3M, the concentration of DTPA should be slightly higher than the total concentration of all the metal ions which can form complexes with DTPA. Under these conditions, the lower limit of detection...

The ac polarographic behavior of Eu + 3 ions in three base solutions (NH4SCN, EDTA-NaCl,DTPA-NaCl) has been compared. In DTPA-NaCl solution the polarographic reversibility of Eu(Ⅲ)is the best among them. The optimun conditions for the polarographic determination of Eu(Ⅲ)are: pH≥6.5, NaCl concentration≥0. 3M, the concentration of DTPA should be slightly higher than the total concentration of all the metal ions which can form complexes with DTPA. Under these conditions, the lower limit of detection of Eu(Ⅲ). is 2×10-7M by ac polarography or single sweep oscil-lographic polarography, or 2×10-7M by differential pulse polarography. Other rare earth ions do not interfere. Small amounts of Eu in samples of mixed rare earth oxides were determined by this method with satisfactory results.In the acidic Eu(Ⅲ)-VOCl2-KI solutions,based on the reaction between Eu(Ⅲ)and VO+2 to regenerate Eu (Ⅲ), a well defined dc polarographic catalytic wave of Eu(Ⅲ) was observed. The presence of 0.1M KI is necessary for the catalytic wave to be separated from the reduction wave of VO + 2. The catalytic wave height is proportional to the concentration of Eu(Ⅲ) and to the square root of the concentration of VO + 2 and is independent of pH in the range from 1 to 3.7.The catalytic wave was proved to be a chemically parallel catalytic wave without the complexity due to adsorption. The electrode and chemical reactions involved may be summarized as follows:Reaction(2)is the rate determining step and its rate constant was determined to be 1.842103M-1sec-1 by dc polarography.

用交流极谱法比较了Eu~(+3)离子在NH_4SCN、EDTA-NaCl、DTPA-NaCl三种底液中的极谱行为,其中以在DTPA-NaCl底液中的极谱可逆性为最好。使用DTPA-NaCl底液测定Eu~(+3)的最宜条件为:pH>6.5,NaCl浓度>0.3M,DTPA浓度略大于溶液中全部可与DTPA络合的金属离子的总浓度。在此条件下,用交流极谱或单扫示波极谱法测定Eu~(+3)的下限为2×10~(-6)M,用微分脉冲极谱法测定为2×10~(-7)M。其他稀土离子不干扰。还测定了某些稀土氧化物样品中少量的Eu,得到满意的结果。 在Eu~(+3)-VO~(+2)-KI溶液中,由于Eu~(+3)的电极还原产物Eu~(+2)被VO~(+2)重新氧化为Eu~(+3),得到一个极谱平行催化波。催化波的波形以在0.1M KI溶液中为最好。波高与Eu~(+3)浓度及〔VO~(+2)〕~(1/2)成正比。在pH 1—3.7范围内波高与pH无关。反应Eu~(+2)+VO~(+2)(?)〔VO Eu~(+4)〕为决定速率的步骤。用直流极谱法测定其反应速度常数k=1.84×10~3M~(-1)sec~(-1)。

 
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