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条件
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  reaction conditions
    OXIDATIVE DEHYDROGENATION OF BUTYLENE TO BUTADIENE Ⅰ. PRELIMINARY SURVEY ON CATALYST AND REACTION CONDITIONS
    丁烯氧化脱氢制丁二烯 Ⅰ.催化剂及操作条件的研究
短句来源
    IN SITU" INFRARED TRACING BEHAVIOUR OF CATALYST SYSTEM UNDER REACTION CONDITIONS
    “原位”红外光谱追踪反应条件下催化体系的变化
短句来源
    Studies on the Copolymerization of Etnylene and Butadiene with Supported Titanium Catalyst (Ⅱ)——The Influences of Reaction Conditions on the CopolymerizationStudies on the Copolymerization of Etnylene and Butadiene with Supported Titanium Catal
    用负载型钛系催化剂进行乙烯-丁二烯共聚合的研究(Ⅱ)——聚合条件对共聚反应的影响
短句来源
    A MOSSBAUER STUDY OF Pt-Sn/γ-Al_2O_3 DEHYDRATION CATALYSTS UNDER THE REACTION CONDITIONS
    反应条件下Pt-Sn/_(γ-)Al_2O_3脱氢催化剂的穆斯堡尔谱研究
短句来源
    A MOSSBAUER STUDY OF Pt-Sn/γ-AI_2O_3 DEHYDRATION CATALYSTS UNDER THE REACTION CONDITIONS
    反应条件下Pt-Sn/γ-Al_2O_3脱氢催化剂的穆斯堡尔谱研究
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  “条件”译为未确定词的双语例句
    Research on the Fast Multivariate Optimization Method for Separation of Complex Samples
    反相高效液相色谱中复杂样品分离条件快速多元优化方法研究
短句来源
    Investigation of Chemometrics Methods to Optimize Capillary Electrophoresis Separation and Extract Information
    毛细管电泳分离条件优化和谱图信息提取的化学计量学方法研究
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    Study on Gas Phase Oxidation Reaction of Propylene with Molecular Oxygen Using Plasma Activation
    等离子体条件下分子氧和丙烯进行气相氧化反应的研究
短句来源
    Investigation of preparation on the supported of Fisher-Tropsch iron catalysts by ~(57)Fe Mossbauer spectra
    用~(57)Fe穆斯堡尔谱研究费-托合成铁-担体催化剂的制备条件
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    Study of Using Carbon Monoxide and Hydrogen to Synthesize Directly a Fuel Gas of High Calorie Value——the technological test of cobalt catalysts
    CO和H_2直接合成高热值燃料气体的研究——钴系催化剂的工艺条件试验
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  reaction conditions
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 reaction conditions were also studied and optimized.
      
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.
      
It was found that lower residue ratios can be obtained under defined reaction conditions: phenol/wood ratio is 4, a 10% catalyst based on the weight of phenol, a temperature of 150°C for 2 h and phosphoric or sulfuric acid.
      
The main advantages of these methods were the simple and easily controlled reaction conditions, and the dispersibility of the resulting products was distinctly improved.
      
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o-Nitrophenol,p-nitrophenol,4-nitro-2-methyl-phenol,2,6-dichloro-4-nitro-phenol,p-nitrosophenol,4-nitroso-2-methyl-phenol,α-nitroso-β-naphthol,p-hydroxy-azobenzenesulfonic acid and Orange Ⅱ were reduced satisfactorily to the corre-sponding aminophenolic compounds by glucose or invert sugar in alkaline solu-tion.m-Nitrophenol and 2,4-dinitrophenol gave negative results.Due to high yield and easy manipulation,this method may be used withadvantage in the laboratory preparation of aminophenolic compounds.

(一)葡萄糖或转化糖在碱性溶液中能把硝基酚类、亚硝基酚类及对磺酸苯偶氮酚类化合物还原成为相应的氨基酚类化合物。得到正面结果的有:阾硝基苯酚、对硝基苯酚、4-硝基2-甲基苯酚、2,6-二氯-4-硝基苯酚、对亚硝基苯酚、4-亚硝基-2-甲基苯酚、α-亚硝基-β-萘酚、对磺酸苯偶氮苯酚、橙Ⅱ等九种化合物。结果可称满意。(二)间硝基苯酚与2,4-二硝基苯酚在上述条件下,得不到相应的氨基酚类化合物。

The molecular weight distribution in two samples of polycaprolactam was deter- mined by fractional precipitation of the polymer from a 1% solution in formic acid (85%) at 25℃, using water as precipitant. The number average molecular weights were deter- mined by titrating carboxyl end-groups of the polymer in benzyl alcohol at 175℃ by 0.05 N KOH in methanol-benzyl alcohol. The differential number distribution curve for both samples shows a very sharp peak and a group of low polymers of wide molecular weight distribution....

The molecular weight distribution in two samples of polycaprolactam was deter- mined by fractional precipitation of the polymer from a 1% solution in formic acid (85%) at 25℃, using water as precipitant. The number average molecular weights were deter- mined by titrating carboxyl end-groups of the polymer in benzyl alcohol at 175℃ by 0.05 N KOH in methanol-benzyl alcohol. The differential number distribution curve for both samples shows a very sharp peak and a group of low polymers of wide molecular weight distribution. Consequently, a single determination of (?) of the polymer can not reveal the actual state of polymerization of the polymer sample. The very sharp peak in the number distribution curve obtained is not in accord with Flory's theory, and the curve is much sharper than a Poisson distribution proposed by Korschak and others, or the distribution function, considering step reaction mechanism alone.

(1)用1%聚已內醯胺在85%甲酸溶液裏加水分級沉澱的方法,测定了兩個聚己內醯胺試樣的分子量分佈曲線。結果都顯示有一極爲狹窄的高峯,和一羣分佈極寬的分子量較低的部分。所以單就試樣的數均分子量,是不足以了解聚合物的聚合情况的。 (2)介紹了聚己內醯胺的羧基滴定的方法。 (3)為了更好地了解己內醯胺的聚合機構,聚合條件和加熱時間對聚合物分子量分佈的影響,值得作進一步的研究。

A method for the separation and determination of small amount of zinc in nickel- plating baths is here reported. The dried sample is fused with sodium hydroxide and the water extract is, after suitable treatments, titrated amperometrically with K_4Fe(CN)_6, using a stationary platinum micro-electrode, while the solu,tion is stirred. The optimum conditions are as follows: applied voltage = +0.7 volt, and the supporting electrolyte should be about 0.5 N in NaC1 and 0.4 N in H_2SO_4. With about 0.5% Zn in sample,...

A method for the separation and determination of small amount of zinc in nickel- plating baths is here reported. The dried sample is fused with sodium hydroxide and the water extract is, after suitable treatments, titrated amperometrically with K_4Fe(CN)_6, using a stationary platinum micro-electrode, while the solu,tion is stirred. The optimum conditions are as follows: applied voltage = +0.7 volt, and the supporting electrolyte should be about 0.5 N in NaC1 and 0.4 N in H_2SO_4. With about 0.5% Zn in sample, the relative precision of the determination lies within ±2%. The whole process may be accomplished in 40 minutes.

本文報告用氫氧化鈉熔融法來分離硫酸鎳中的微量鋅,並以亞鐵氰化鉀為試劑,用電流觴定來測定鋅。最適宜的實驗條件如下:指示電極用鉑微電極,而攪拌溶液,外加電壓為+0.7伏特,底液中合氯化鈉約0.5N,硫酸約0.4N。當固體試樣中合鋅約0.5%或欲測溶液中合鋅約5×10~(-4)克離子/升時,測定的相對誤差小於±2%。分離和測定全部所需時間約40分鐘。

 
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