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the yield
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  收率
    The reaction rate under microwave heating was 3~12 times higher than that under conventional heating, and the yield and selectivity increased as well.
    结果表明,微波加热条件下反应速率是常规加热的3~12倍,收率和选择性也都有提高。
短句来源
    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
    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 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。
短句来源
    At this condition,the yield of [2,2]-paracyclophane was 10.1%,and the quality of the product met the standard of qualified product.
    收率10.1%。
短句来源
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  产率
    The yield of DMF can reach 78.6% under the optimal reaction conditions.
    试验证明,在最优条件下,富马酸二甲酯的产率可达到78.6%。
短句来源
    The synthesis of 3,4-dihydropyrimidin-2(1H)-ones by cyclocondensation of aldehydes,β-ketoester and urea or thiourea at a molar ratio of 1∶1∶1.5 was studied,using HClO4 as the catalyst and glacial acetic acid as the solvent. The reaction time was 3.5 h,and the yield ranged from 75% to 98%.
    HClO4催化下,芳香醛、β-酮酸酯、脲或硫脲(物质的量比1∶1∶1.5)在冰醋酸中环化缩合,合成3,4-二氢嘧啶-2-酮衍生物,反应时间3.5 h,产率75%~98%。
短句来源
    The results showed that when the molar ratio of phenol to ceric ammonium nitrate was 1∶1.05,the yield of 2,4-dinitrophenol was 72% at a reaction temperature of 50 ℃ and a reaction time of 1.5 h.
    最佳反应条件为:苯酚与硝酸铈铵的物质的量比为1∶1.05,反应温度为50℃,反应时间为1.5 h,产率达72%。
短句来源
    The yield of furil increased to 91.7%(from 2-furaldehyde) after improvements in experimental procedure.
    通过改进实验条件,使合成糠偶酰的产率提高到91.7%。
短句来源
    The optimum conditions were as follows: the molar ratio of alcohol to acid was 1∶1.1,the amount of the catalyst was 1.5%,the microwave power was 270±10 W,and the irradiation time was 20 min. The yield of ester was over 95%.
    经正交实验得出合成最佳条件为:醇酸摩尔比1∶1.1、PTSA占原料总质量的1.5%、微波功率270±10 W、辐射时间20 min,产率可达95%。
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  “the yield”译为未确定词的双语例句
    IMPROVEMENT IN THE YIELD OF DIMETHYL ETHER FROM SYNTHESIS GAS UNDER CONCENTRATION PERIODIC OPERATION
    IMPROVEMENT IN THE YIELD OF DIMETHYL ETHER FROM SYNTHESIS GAS UNDER CONCENTRATION PERIODIC OPERATION
短句来源
    STUDY ON THE YIELD INCREASING EFFECT OF HIGH EFFICIENT POLYELEMENT LIQUID FERTILIZER
    高效多元液肥增产机理的研究
短句来源
    Duplicate tests of the optimized winterization method show that the content of α-linolenic acid and the yield of oil can reach 39.90% and 70% respectively after winterization.
    采用该工艺条件重复试验证实,α-亚麻酸的含量可提高到39.90%,出油率可达70%。
短句来源
    The results showed that the yield of total flavonoid was 2.67% at the conditions of 50% ethanol solution, 80℃,1∶30 solid-liquid ratio and 1h for extraction.
    结果表明,用50%乙醇溶液,提取温度80℃,料液比1∶30,提取时间1h,提取效率较好,总黄酮得率为2.67%。
短句来源
    After 120 h fermentation at the temperature of 30 ℃, the yield of total isoflavone reached 1.82 times as that by normal ethanol extraction.
    在30℃下发酵120h,总异黄酮提取得率为常规醇提法的1.82倍。
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  the yield
H4SiW12O40-PAn is an excellent catalyst for synthesizing n-butyraldehyde 1,2-propanediol acetal, and the yield can reach more than 95.2%.
      
The yield of glutaric dialdehyde by this method can reach 73%.
      
The yield of the final product was 78%, and the melting point was 231-233°C.
      
Effect of the reaction time, mole ratio of reactants, and amount of catalyst on the yield of benzodioxoles were investigated.
      
The starting material used abroad is expensive and the yield is low (16%-28%); furthermore, to our best knowledge, no characterization of Compound A is available in the open literature.
      
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Dimethyldiethoxysilane was hydrolyzed to octamethylcyclotetrasiloxane with hydrochloric acid in the presence of ethyl ether. The yield was 80% of the theory. A procedure for the preparation of dimethyldiethoxysilane by the Grignard method with satisfactory yields was also reported.

二甲基二乙氧基矽烷在乙醚和適量的鹽酸下進行水解,可得八甲基圜四矽氧烷,產率為80%。 對於用Grignard法製備二甲基二乙氧基矽烷,確定了原料用量的比例,並得到滿意的產率。

By the same route outlined in Part Ⅲ of this series,the title compound was preparedfrom D-arabinose by five stages of reactions.Toluene-p-sulphonation in pyridine of α- and β-D-arabofuranoside mixture(Ⅱ),prepared according to Halliburton and McIlroy first at 0℃and then at room temperature,followed by fractional crystallization of the product from alcohol,gave methyl 2,3,5-tri-O-toluene-p-sulphonyl-α-D-arabofuranoside(Ⅲ),m.p.117.5—119℃,[α]_D~13=+43.9°(chloroform,c=1.09,l=2 dm.)in 39% yield.(Ⅲ)was caused toundergo...

By the same route outlined in Part Ⅲ of this series,the title compound was preparedfrom D-arabinose by five stages of reactions.Toluene-p-sulphonation in pyridine of α- and β-D-arabofuranoside mixture(Ⅱ),prepared according to Halliburton and McIlroy first at 0℃and then at room temperature,followed by fractional crystallization of the product from alcohol,gave methyl 2,3,5-tri-O-toluene-p-sulphonyl-α-D-arabofuranoside(Ⅲ),m.p.117.5—119℃,[α]_D~13=+43.9°(chloroform,c=1.09,l=2 dm.)in 39% yield.(Ⅲ)was caused toundergo Oldham-Rutherford reaction(treatment with sodium iodide in acetone for 2(1/2) hours at100℃)to give 87% yield of methyl 2,3-di-O-toluene-p-sulphonyl-5-deoxy-5-iodo-α-D-arabofurano-side(Ⅳ),m.p.122—123.5℃.[α]_D~13=+52.7°(chloroform,c=1.0065,l=2 dm.).Theiodine was then replaced with hydrogen by catalytic hydrogenation in presence of Raney nickel andthe crystalline methyl 2,3-di-O-toluene-p-sulphonyl-α-D-arabomethyloside(Ⅴ),m.p.64—66℃,[α]_D~16=+56.8°(chloroform,c=1.03,l=2 dm.),was obtained in 75% yield.The anhydroring formation was finally achieved by treating(Ⅴ)with sodium methoxide in boilingmethanol under the condition described in Part Ⅲ for the corresponding L-isomer and methyl2,3-anhydro-α-D-lyxomethyloside(Ⅵ)was obtained as a colorless,mobile liquid,b.p.67℃/19mm.,[α]_D~20=+66.9°(chloroform,c=1.069,l=2 dm.);the yield was 64.6%.

自 D-阿拉伯糖经以下五步反应合成了2,3-内醚-5-去羟-α-D-来苏糖甲基甙 (Ⅵ):D-阿拉伯糖(Ⅰ)→D-阿拉伯糖甲基呋喃甙(Ⅱ,α-和β-端基差向异构体混合物)→2,3,5-三-O-对甲苯磺酰基-α-D-阿拉伯糖甲基呋喃甙(Ⅲ)→2,3-二-O-对甲苯磺酰基-5-去羟-5-碘代-α-D-阿拉伯糖甲基呋喃甙(Ⅳ)→2,3-二-O-对甲苯磺酰基-5-去羟-α-阿拉伯糖甲基甙(Ⅴ)→2,3-内醚-5-去羟-α-D-来苏糖甲基甙(Ⅵ)。最后产物(内醚糖)的结构是根据第三报中所提出的证据肯定的。

The tetranucleoside triphosphate UpCpCpA has been synthesized by either the combined use of chemical and enzymic methods or chemical method alone. A schematic diagram is presented in Figure 1.The UpCpCpA is synthesized with PNPase which catalyzes the single addition of the 2'(3')-O-(α-methoxyethyl)-ADP to the primer UpCpC. The yield is 30%. The problems of the isolation of reaction produots and of the transnucleotidation are discussed.

用化学合成或化学与酶促合成相结合的方法均能制备得到UpCpCpA(图1)。化学合成包括“2+2”和“1+3”两条路线。参考Mackey和Gilham方法,在PNPase催化下,引物UpCpC与2′(3′)-O-甲氧乙基ADP反应进行单一加成可产生30%的UpCpCpA。为了获得纯的产品,采用了二次柱层析法(图2)。文中讨论了PNPase连接的转核苷酸作用问题。

 
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