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  the time
    Methyl-furoate is synthesized from furfural by Cannizzaro reaction,acyl chloride reaction and esterification. It showed that the time of esterification is only 2.5 hours and the yield can reach 85.0%.
    以糠醛为起始原料,通过康尼查罗反应、酰氯化和酯化反应合成了糠酸甲酯,实验结果表明:酯化反应时间2.5h,糠酸甲酯收率可达85.0%。
短句来源
    Compared with the ultrasonic and traditional hot-water extraction method,shorten the time from three-quarters of polysaccharide extracted rate above 30%.
    超声波法与传统热水法相比,提取时间缩短3/4,多糖提取率提高30%以上。
短句来源
    The time used with MAE is only 5 min with 76.56% extraction rate, while the conventional extraction method took two hours with about 68.46% extraction rate. This novel method is suitable for fast extraction of triterpene glucoside from Siraitia grosvenorii.
    微波辅助提取的提取时间为5min时,提取率达76.56%,而传统的加热提取时间为2h时,提取率为68.46%。
短句来源
    Through changing the factors of influence such as the mix of reactants,different catalyst and the time of reaction etc. The result showed that the dehydrating agent is carbon tetrachloride,pyruvic acid ∶absolute methanol ∶ carbon tetrachloride =1∶2.5∶0.28,the yield is 73.9%.
    通过对反应物配比、带水剂、反应时间等影响因素进行对比试验,确定以四氯化碳为带水剂,最佳反应配比为:丙酮酸∶无水甲醇∶四氯化碳=1∶2.5∶0.28,产物收率可达73.9%。
短句来源
    The static saturated adsorption capacity of D141 resin was 19.86 mg/g dry resin while the time for it to achieve saturation adsorption was 5 h. Besides,the adsorption isotherm data of D141 resin could well fit the Langmuir equation. 70%(volume fraction) ethanol was a suitable solvent to elute the polyphenols adsorbed on the resin.
    结果表明,D141树脂对石榴皮多酚的饱和吸附量为19.86 mg/g(干树脂),吸附等温线符合Langmuir方程,饱和吸附时间为5 h,适宜解吸剂为体积分数70%的乙醇溶液;
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  reaction time
    AN INVESTIGATION ON CATIONIC POLYMERIZATION OF α-METHYLSTYRENE WITH Cl_2/TiCl_4 INITIATOR SYSTEM Ⅱ. EFFECTS OF PO1YMERIZATION TEMPERATURE, SOIVENT AND REACTION TIME
    Cl_2/TiCl_4体系引发α-甲基苯乙烯阳离子聚合的研究 Ⅱ.聚合温度、溶剂用量以及反应时间的影响
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    4-Tert-butylphenylboronic acid was synthesized with trimethyl borate and Grignard reagents which was prepared with 1-bromo-4-tert-butylbenzene and metal magnesium as raw materials under N2. An optimized process was obtained as follows: 1.5∶1molar ratio of 1-bromo-4-tert-butylbenzene to trimethyl borate,the temperature -20~-30℃,and the reaction time 140min. The final yield was 69.5%.
    以对叔丁基溴苯为原料,在氮气保护下,通过格氏反应合成了对叔丁基苯硼酸,考察了温度、反应时间和物料配比等因素对收率的影响,优化合成条件为:n(对叔丁基溴苯)∶n(硼酸三甲酯)=1∶1.5,反应温度为-20~-30℃,反应时间140min,总收率69.5%。
短句来源
    The effect of the temperature pH,catalyzer and time on the production yield is investigated by orthogonal experiment. The product yield is 42% in the optimal conditions such as 0~5℃, pH9~10, catalyzer perchloric acid and reaction time 20 h.
    并通过正交实验法考察了温度、pH值、催化剂、时间等对产物收率的影响,确定了在温度为0~5℃、pH值为9~10、催化剂为高氯酸、时间为20h时产物的收率为42%。
短句来源
    The influences of medium alkalinity,solvents,reaction temperature and reaction time on the yield of the product were investigated.
    讨论了介质碱性、溶剂、反应温度和反应时间等工艺条件对产物收率的影响。
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    Suitable reaction parameters for the synthesis were obtained as follows:solvent was p-xylene,n(silver oxide)∶ n(quaternary ammonium salt)=1 ∶ 1,reaction temperature110℃ and reaction time 10 h.
    获得了合成反应的优化参数为:对二甲苯为溶剂、硼氢化钠为还原剂、n(氧化银)∶n(季铵盐)=1∶1,反应温度110℃、反应时间10h。
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    Series of Studies of Vitamin K by Pulse Radiolysis and Laser Photolysis(Ⅰ)─A Pulse Radiolysis Studies of the Reduction Reaction of VK_3 in Aqueous Solution
    Vitamin K脉冲辐解与激光光解的研究(Ⅰ)──VK_3水溶液脉冲辐解还原反应时间分辨的研究
短句来源
    The factors that influenced the reaction under microwave heating were investigated,the yield of 82.3% was obtained on condition of ethylene glycol ∶ cyclohexanone = 1.4 ∶ 1(mol/mol),p-toluene sulphonic were investigated acid:2.5 g/mol(based on the amount of cyclohexanone),cyclohexane:80 ml/mol,irradiation power:90 W,13 min.
    考察了微波条件下各因素对反应的影响,得出优惠条件:n(环己酮)∶n(乙二醇)=1∶1.4,对甲苯磺酸为2.5g/mol(以环己酮物质的量计),带水剂环己烷为80mL/mol,辐射功率为90W,辐射时间为13min,产物收率达82.3%。
短句来源
    The better conditions were found as follows: MA∶NaOH∶NH_3∶H_2O(mol ratio)=2∶3∶2∶16,160 ℃,10.0 h.
    结果表明,合成反应较合适的原料摩尔比n(MA)∶n(NaOH)∶n(NH3)∶n(H2O)=2∶3∶2∶16,较好反应温度160℃,反应时间10.0 h。
短句来源
    The optimum conditions for the synthesis of biuret-glucose resin are as follow: pH=1.0; n(glucose)∶n(biuret)=10∶1; the mass ratio of the catalyst is 0.6%;
    葡萄糖缩二脲树脂胶黏剂合成的最佳工艺条件为:pH值为1.0,n(葡萄糖)∶n(缩二脲)=10∶1,催化剂用量为0.6%,反应温度为95℃,反应时间为11h。
短句来源
    The result indicates that the predicted evaporation mass and temperature of solution are equivalent to the measured ones,and the average error is 25.82% and 33.79% respectively,thus providing the basis to research evaporation process of multi-component liquid.
    结果表明,新建立的模型能够较准确地预测二组分液体蒸发质量和温度随时间的变化,其预测平均偏差分别为25.82%和33.79%,从而为今后研究多组分液体的蒸发过程奠定了基础。
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  the time
For a fairly general class of orthonormal scaling functions and wavelets with regularity exponents n, we prove that the areas of the time-frequency windows tend to infinity as n → ∞.
      
We study boundary value problems for the time-harmonic form of the Maxwell equations, as well as for other related systems of equations, on arbitrary Lipschitz domains in the three-dimensional Euclidean space.
      
We study boundary value problems for the time-harmonic form of the Maxwell equations, as well as for other related systems of equations, on arbitrary Lipschitz domains in the three-dimensional Euclidean space.
      
Finally, we consider the spline of order 2; we investigate numerically the region of the time-frequency plane where it generates a frame and we compute the dual function for some values of the parameters.
      
Our proofs proceed in the time domain and allow us to represent each solution regardless of the spectral radius of P(0):=2-s∑cα, which has been a difficulty in previous investigations of this nature.
      
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  reaction time
The influence factors of the synthesis were discussed, and the best reaction conditions were found: the molar ratio of n-butyraldehyde to 1,2-propanediol is 1:1.5, the amount of catalyst used is 1.2% of feed stock, and the reaction time is 1.0 h.
      
The Fe3O4 magnetic fluid was obtained by one-step method with the W/O microemulsion as microreactor to synthesize magnetic nanoparticles (reaction temperature was 30 °C and reaction time was 5 h) and kerosene as carrier liquid.
      
The enantiomeric excess of the reduction product was up to 83.2% with cyclohexane as the solvent, the molar ratio of ligand: reductive agent: β-acetonaphthalene is 0.04:1.6:1, and 72-hours reaction time at 0°C.
      
Effect of the reaction time, mole ratio of reactants, and amount of catalyst on the yield of benzodioxoles were investigated.
      
The best reaction conditions: molar ratio of catechol to aldehydes or ketones is 1:1.4, catalyst amount is 3.5 g/l mol catechol, reaction time is 5 h.
      
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In this paper a modified method is recommended for the determination of rubber hydrocarbon present in kok-saghyz rubber by means of bromination.This method is rapid and accurate.A conversion factor of 0.298 is obtained for con- verting rubber bromide content to rubber hydrocarbon content for kok-saghyz rubber.The conversion factor agrees well with the theoretical value.

本文报告了用重量溴化法测定青橡胶草生胶中橡胶烃的各种适宜条件,并求得了由溴化橡胶换算为橡胶烃的换算因数为0.298。三氯甲烷可用来防止溴化橡胶的结膜,同时并可防止溴与橡胶的置换反应。每10毫升橡胶液应加溴化溶液2毫升。溴化反应可在常温进行。三氯醋酸可使橡胶容易溶解,对分析结果无显著影响,用或不用均可。溴化法无论在分析时间上和精确度上,均较直接抽提法和间接测定法为优。

A colorimetric method for the determination of antimony in the range 0.1 to 3.0μg per milliliter blood is described. The time needed for the destruction of organic matter is shortened to 8—12 minutes. The proposed method is as follows: Accurately transfer 1 ml of blood sample to a hard glass test tube (25×150 mm.), to which 1 ml of conc. HNO_3 is then added. Heat gently with a small flame till the solution changes to amber color. Add 0.5 ml conc. H_2SO_4 and heat again carefully until dense white fume is evolved....

A colorimetric method for the determination of antimony in the range 0.1 to 3.0μg per milliliter blood is described. The time needed for the destruction of organic matter is shortened to 8—12 minutes. The proposed method is as follows: Accurately transfer 1 ml of blood sample to a hard glass test tube (25×150 mm.), to which 1 ml of conc. HNO_3 is then added. Heat gently with a small flame till the solution changes to amber color. Add 0.5 ml conc. H_2SO_4 and heat again carefully until dense white fume is evolved. If the solution is not clear, add a few more drops of HNO_3 and heat repeatedly till a clear colorless solution is obtained. Cool, add 1 ml NaCl solution and 0.5 ml NaNO_2 solution, shake for 2 minutes, then add 1 ml of urea solution. Transfer the mixture to a separatory funnel containing 10.0 ml benzene. Wash the test tube with three portions (5 ml) of distilled water, add 10 drops of malachite green reagent solution and shake the mixture immediately for 5 minutes. Separate the benzene layer in a centrifuge tube and centrifuge 3 minutes to separate the suspended droplets of water. Transfer the benzene solution into a 10 cm cell and measure the extinction with an Ilford 607 filter, using benzene as blank.

作者等提出了血液中有机质的快速破坏法及采用孔雀綠比色法测定血样中微量锑。本法破坏血样所需时間为10分鐘左右,所需血样为1毫升。致謝:本文承儲俊民同志供給一部分資料及协助,謹此志謝。参加此項工作者尚有楊松成同志。

A simplified volumetric method for the determination of sulfur in organic compounds is described. The results obtained by this method are in agreement with those obtained by the gravimetric method, The method is stated as following: Weigh accurately a sample containing 30—75 mg SO_4~- into a nickel crucible containing 1 g. of KNO_3 and 8 g. of KOH. Heat the crucible carefully with a small flame until the contents melt, increase the heat gradually until the decomposition is complete. Leach the melt with water,...

A simplified volumetric method for the determination of sulfur in organic compounds is described. The results obtained by this method are in agreement with those obtained by the gravimetric method, The method is stated as following: Weigh accurately a sample containing 30—75 mg SO_4~- into a nickel crucible containing 1 g. of KNO_3 and 8 g. of KOH. Heat the crucible carefully with a small flame until the contents melt, increase the heat gradually until the decomposition is complete. Leach the melt with water, acidify with HCl and heat gently until bubbles cease to evolve. Filter, dilute the filtrate to about 60 ml. and after neutralizing with 6 N NH_4OH, add 0.2 ml. 6 N HCl. Heat to 70℃, add gradually the benzidine hydrochloride reagent to precipitate the sulfate in the solution. After cooling in an ice bath for 1 hour, the precipitate is filtered from the solution. Suspend the precipitate in water, heat to 80℃ and titrate with 0.1 N NaOH solution, using phenolphthalein as indicator.

测定一般有机化合物中的硫含量,可將有机物先用KOH—KNO_3破坏,使成硫酸联苯胺沉淀后,再滴定其中的硫酸根。应用本法可测定相当于30—75毫克硫酸根的含硫有机化合物,所得結果准确(表1,3)。平均誤差为±0.11%(表2),操作比重量法简单,所费时間亦少,因此可作为测定有机物中硫含量的快速方法。

 
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