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- sensitivity
相关语句
  相似匹配句对
     sensitivity;
     (5)灵敏度;
短句来源
     sensitivity:medium;
     灵敏度:中; 线性化参数:SX=3。
短句来源
     The study of the pH-sensitivity of polycrylamide
     聚丙烯酰胺水凝胶的PH敏感性研究
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  - sensitivity
The experiment shows that when the thickness of YVO4 crystal is 0.5 mm, the effect of cross-sensitivity will be reduced to 0.13 μ?/°C, which is 1.6% of the effect used by only one fiber Bragg grating for strain measure.
      
And when the thickness is 0.1 mm the cross-sensitivity will be reduced to 0.006 7 μ?/°C, which is less than 0.08%.
      
The mass-normalized mode shapes were obtained from the eigen-sensitivity analysis.
      
The mass-normalized mode shapes were acquired by changing the structural mass and by eigen-sensitivity analysis.
      
Highly purified preparations of intact TPO and a product of its limited trypsinolysis are expected to be used as research tools and components of high-sensitivity immunoassays.
      
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The effect of pressure on photographic sensitivity is discussed on the experimental basis that the quantity E/EC, where E is the illumination actually used when the photographic emulsion is under pressure, and Ee the illumination which would be required to produce the same optical density when the emulsion is under no pressure, is a function of pressure only and that for pressures greater than a certain value, E/Ee becomes a linear function of the pressure.

当照相时,照相片子——映像纸,软片,或玻璃板——被压,则其感光性减弱,是为照相的压力效应。设E为照相片子在压力P下得光密度d所需之光照度,若片子不受压力则用光照度E_e即可得此同一之光密度d,故E_e可称在压力P下E之有效照度。吾人实验证明E/E_e为压力P之函数,当p>200kg/cm~2时,E/E_e与P成正比例。 此照相的压力效应,与照相时所用光之颜色,极有关系。黄色光较绿色光为显,绿色光较蓝色光紫色光为显至紫外光则几无此效应。 又此效应之大小,随各种照相片子而不同。就我们所研究的蔡爱斯伊康正色软片,伊司门人像软片,和矮克发等色软片而论,以第一种为最大第二种次之第三种为最小。 这个效应,在实际上,或可有些应用。

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl....

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl. But the sodium ferric fluoride thus formed is fairly soluble in water and makesthe end-point unclear,therefore the titration can not be performed accurately.This seems to be due to the fact that the following two reactions advancesimultaneously,and accordingly the formation of sodium ferric fluoride is in-complete in aque(?)us medium:3NaF+Fe(NO_3)_3→FeF_3+3N_aNO_33NaF+FeF_3→Na_3FeF_6Nevertheless,these reactions,according to the author's experiments;proceedalmost quantitatively in meda.containing at least 50% by volume of alcohol.This paper reports the xperimental results obtained in the fundamentalstudies on the various factors influencing the accuracy of the volumetry,namely,the sensitivity and the necessary amount of sodium salicylate used asindicator,the pH value,the alcoholic concentration of the titration medium,the concentration of the fluoride taken for the determination and the timewhen alcohol should be added in the course of titration.Furthermore,a rapidvolumetric process with high accuracy is proposed together with its applicationsin ordinary analyses of sodium fluoride and other fluorine compounds.The proposed method is characteristic in using sodium salicylate asindicator,which shows sharp violet color with minute amount of ferric ion inmedium of pH 3 controlled with buffer solution,then titrating with standardferric nitrate,and adding proper amount of alcohol(the alcoholic concentra-tion at the end-point should be above 50%)during the titration,when themedium becomes orange yellow in color.The method may be summarized as follows:Take 5 ml of neutral sodiumfluoride solution of about 0.3 N in a small Erlenmeyer flask,add 2.5 mlof Walpole's buffer solution of pH 3(formed by dissolving 34.0 g ofcrystalline sodium acetate and 20 ml of 38% HCl in water,and making upto 250 ml)and 1 ml of 0.1 M sodium salicylate dissolved in 50% alcohol.After sufficient stirring,titrate with standard 0.3 N(0.05 M)ferric nitratesolution,using micro-burette until the medium becomes orange yellow,thisstep being reached after addition of about 4 ml of titrant.Then decolorizethe solution by adding 12.5 ml of absolute alcohol(or 13 ml of 95% alcohol),previously purified by redistillation with lime;stirring is necessary during theaddition.Further continue the titration until the light pink color formeddoes not fade after stirring for 30 seconds when observed over a white surface. In the analyses of sodium fluoride and other fluorine compounds con-taining interfering substances,such as divalent and polyvalent metallic ions,phosphate,silicate,borate,carbonate,sulfide ions and reductants acting on ferricion,it is necessary to separate fluorine from these interfering substances bythe distillation with sulfuric acid according to the method of Willard andWinter(20).Then the distillate is neutralized with dilute sodium hydroxideand adjusted to the proper pH with hydrochloric acid using p-nitrophenol asindicator.The solution is ready for titration as described.But in the caseof absence of these interfering substances except carbonate,for example,inthe determination of the concentration of sodium fluorde solution obtained bythe extraction of the crude product,produced industrially by fusing fluorsparwith sodium carbonate and silica,the above separation of fluorine by dis-tillation is dispensable.The anaIytical results obtained by the proposed method are in goodagreement with those obtained by the lead chlorofluoride process(8),whichis recognized as official method for the determination of fluorine in agriculturalproducts.

本文介绍一容量分析氟的新方法和在工业制品上的应用,并分析了一种工业制备的氟化钠液,所得的结果和氟氯化铅法所得的极为一致。对于影响该分析法准确度的各种因素:指示剂的灵敏度和滴定时适宜的用量、溶液的 pH 值、应加的乙醇量、操作中加乙醇的次序、以及氟离子的适宜浓度,均加以研究并找出适宜的情况。本法用硝酸铁为标准液,水杨酸钠作指示剂,在 pH=3左右作滴定;当溶液呈橙黄色时,加入适量的乙醇,使其浓度在终点时仍不低于50%。如有干扰物质如二价及多价金属离子、磷酸根、矽酸根、硼酸根、碳酸根、硫化物和还原物质可能与三价铁起作用者,均应分离之。

Lecocq first found that the sensitivity of diphenylcarbazide test for molybdate ions in mineral acid medium was 1:2.6×10~5 (it is assumed that he used com- mercial ammonium molybdate),and Schmitz-Dumont reported a value of 1:2 ×10~6 in acetic acid solution.In the present investigation,it is found that the sensitivity is still higher (1:5×10~7) when the test is carried out in the neutral medium (and in test tubes with an inner diameter of 10 mm).Evidently the sensitivity is greatly influenced...

Lecocq first found that the sensitivity of diphenylcarbazide test for molybdate ions in mineral acid medium was 1:2.6×10~5 (it is assumed that he used com- mercial ammonium molybdate),and Schmitz-Dumont reported a value of 1:2 ×10~6 in acetic acid solution.In the present investigation,it is found that the sensitivity is still higher (1:5×10~7) when the test is carried out in the neutral medium (and in test tubes with an inner diameter of 10 mm).Evidently the sensitivity is greatly influenced by the concentration of hydrogen ions. The use of the dipbenylcarbazide as a qualitative reagent for tungstate ions has not yet been recorded before.It is found that in the neutral medium the sensitivity of the test is 0.1[D]~5,which is the same as that for molybdate under similar conditions.

本文报告在中性溶液中,对称-二苯基碳酰二胼对钨、钼的灵敏度,两者都是1:5×10~7,或以0.1[D]~5表示之。钨、钼酸根的灵敏度随溶液中氢离子的多寡而不同。

 
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