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
   时间 在 化学 分类中 的翻译结果: 查询用时:0.111秒
图标索引 在分类学科中查询
所有学科
化学
有机化工
一般化学工业
外科学
中国文学
气象学
神经病学
心理学
哲学
更多类别查询

图标索引 历史查询
 

时间
    很抱歉,暂未找到该词条在当前类别下的译词。您可以查看在所有学科下的译词。
相关语句
  “时间”译为未确定词的双语例句
    Electrochemical in Situ Fast Time-Resolved Microscope FTIR Reflection Spectroscopy and Its Applications in the Studies of Surface Dynamic Processes on Nanostructured Pt Electrodes
    原位快速时间分辨显微FTIRS的建立及其对Pt微电极表面动态过程的研究
短句来源
    Methodology of Comprehensive Two-dimensional Gas Chromatography /Time-of-Flight Mass Spectrometry for Complex Sample Analysis
    全二维气相色谱/飞行时间质谱用于复杂体系分析的方法学研究
短句来源
    Novel Lanthanide Fluorescence Probes and Their Application to Time-Resolved Fluorescence Detection of Singlet Oxygen
    新型稀土荧光探针及单线态氧的时间分辨荧光分析
短句来源
    TIME-RESOLVED FLUORESCENCE(TRF) AND ITS APPLICATIONS
    时间分辨荧光(TRF测量及其应用
短句来源
    TIME-RESOLVED LASER FLUORESCENCE SPECTROMETRY Ⅰ.MEASUREMENT OF FLUORESCENCE LIFETIME
    时间分辨激光荧光光谱分析技术研究 Ⅰ.长寿命荧光寿命测量
短句来源
更多       
查询“时间”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
没有找到相关例句


An electrophotometric method has been worked out for the determination of magnesium in cast iron using titan yellow as indicator.Briefly,the method consists of dissolving the sample in dilute sulphuric acid,separating iron and other metals such as copper and nickel by electrolysis with mercury cathode and precipitating manganese from ammoniacal solution with ammonium persulfate.Ammonimn salt,silica and traces of aluminaare thenremoved. Finally,the prepared titan yellow reagent is added to the solutionand the...

An electrophotometric method has been worked out for the determination of magnesium in cast iron using titan yellow as indicator.Briefly,the method consists of dissolving the sample in dilute sulphuric acid,separating iron and other metals such as copper and nickel by electrolysis with mercury cathode and precipitating manganese from ammoniacal solution with ammonium persulfate.Ammonimn salt,silica and traces of aluminaare thenremoved. Finally,the prepared titan yellow reagent is added to the solutionand the magnesium content determined from the electrophotometric reading.The time required for each determination is approximately 5 hours. The effect of interfering elements which are likely present in cast iron such as manganese, silicon,phosphorus, aluminum, copper, nickel and vanadium as well as ammonium ion and alkali and alkaline earth metals has been studied and discussed.It has been shown that manganese, silicon, aluminum,copper,nickel,iron and ammonium ions can be removed down to such low values as to cause no significant interference.Phosphorus under 0.4% has no appreciable effect.Vanadium is not separated in the present method,but fortunately it is usually present in insignificant amounts in ordinary cast iron.The effect of calcium is compensated by the introduction of saturated calcium sulphate solution before the titan yellow addition. Potassium and sodium have no appreciable effect when present in small amounts. The results obtained by the present method for the determination of magnesium in 11 known samples are good,the average difference being 0.002% in a range of 0.000% to 0.140% Mg.The data obtained by the present method are also in good agreement with those obtained by gravimetric methods On seven nodular iron samples made by the Metallurgical Division of our Institute.A detailed procedure for the determination of magnesium in cast iron has been suggested and included in this paper.In view of its rapidity and fair accuracy,the new photometric method might prove useful for the purpose of control in a nodular iron foundry.

本文报告将地丹黄比色法应用於测定铸铁中之镁的试验结果.如将铁、锰、铝、矽等干扰物质预先除去,则镁的测定并无困难.依照本文所擬的方法分析,所需时间约为五小时,较重量法迅速得多.

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。

 
<< 更多相关文摘    
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关时间的内容
在知识搜索中查有关时间的内容
在数字搜索中查有关时间的内容
在概念知识元中查有关时间的内容
在学术趋势中查有关时间的内容
 
 

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