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
   color change 在 化学 分类中 的翻译结果: 查询用时:0.01秒
图标索引 在分类学科中查询
所有学科
化学
轻工业手工业
口腔科学
园艺
一般化学工业
金属学及金属工艺
无机化工
有机化工
材料科学
更多类别查询

图标索引 历史查询
 

color change
相关语句
  颜色的变化
    A discussion is given of the relation between the alkalinity and titration equivalence point, and of the color change of the methyl orange indicator with different pH values.
    本文讨论了水样中总碱度含量与滴定等当点的变化关系和甲基橙在不同pH值下颜色的变化情况。
短句来源
    The color change of the solution in the changing-complex reaction between Fe3+-sulfosalicylic and phytic acid is studied in the present article, and the changing-conplex reaction is used to the colorimetric determination of content of phytic acid.
    研究了磺基水杨酸铁同植酸的转络反应所引起溶液颜色的变化,并把该转络反应用于植酸含量的比色测定。
短句来源
    Action of test paper is determining characater of the solution by color change.
    试纸的作用是通过其颜色的变化测试溶液的性质。
短句来源
  “color change”译为未确定词的双语例句
    Study on Color Change of GaP Nanocrystals Water-solution with Temperature
    温致变色的GaP纳米晶水溶液性质研究
短句来源
    Study on the Color Change of YAP Crystals
    YAP晶体变色现象的研究
短句来源
    The properties of C16AzoHq, C18AzoNp and C18ImiHq in solutions and LB films have been investigated. C16AzoHq and C18AzoNp show acidichromism in LB films. And the color change is reversible.
    本文研究了化合物C16AzoHq、C18AzoNp和C18ImiHq在溶液及LB膜中的性质:化合物C16AzoHq和C18AzoNp可发生LB膜中的酸致变色反应,该反应是可逆的,可用碱性物质NH3·H2O使其恢复;
短句来源
    In the copolymerization of ethylene and propylene with Ziegler-Natta catalyst VOCl3/ Et3Al2Cl3, when CCl4 was used as polymerization solvent, there occurred a sudden color change in the polymerization process.
    本文以VOCl_3/Et_3Al_2Cl_3为催化剂,在CCl_4溶剂中进行乙烯共聚反应。 在聚合过程中,发生一异常的颜色突变现象。
短句来源
    A solid superacid was synthesized with clay and characterized by XRD,FT-IR and DTA- TG etc. The Hammett acidity function H_o was determined by observing the color change of the indica-tOrs that was 13. 16
    用粘土合成固体超强酸.对该酸进行了结构表征、酸函数测定(-13.16<H_o<-12.70)及催化己二酸二辛酯的合成反应.结果表明,它的催化活性超过浓H_2SO_4,并且可以重复使用.
短句来源
更多       
查询“color change”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
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  color change
The method is based on the bromide-catalyzed oxidation of this violet complex by iodate followed by measuring the color change at λ = 542 nm spectrophotometrically.
      
The activity was evaluated by the decrease in absorbance as the result of DPPH' color change from purple to yellow.
      
Color change, bundle strength, weight loss, fiber diameter, surface modification, dye-ability and dye wash fastness were assessed for both methods and compared with the original brown top.
      
The DE-Mag layered hybrids were found to undergo reversible color change by alternating UV and visible light irradiation.
      
Secondly, an experimentally observed selective recognition of Cu2+ by an azobenzene-appended receptor, which can exhibit Cu2+ selectivity by color change, is discussed based on computational approach.
      
更多          


The molecular weight determination of polycaprolactam by the end-group titration was studied with conductometric, potentiometric and visual methods. Both amino and carboxyl end-groups could be titrated in the same solvent at the same temperature. The sample was dissolved in benzyl alcohol at about 135°, cooled to 60°, and then diluted with suitable amount of methanol-water mixture (2:1 by volume). The supersaturated solution thus formed, which could remain clear over several hours, was titrated with 0.03 N alcohol-water...

The molecular weight determination of polycaprolactam by the end-group titration was studied with conductometric, potentiometric and visual methods. Both amino and carboxyl end-groups could be titrated in the same solvent at the same temperature. The sample was dissolved in benzyl alcohol at about 135°, cooled to 60°, and then diluted with suitable amount of methanol-water mixture (2:1 by volume). The supersaturated solution thus formed, which could remain clear over several hours, was titrated with 0.03 N alcohol-water solution of hydrochloric acid and of sodium hydroxide. Small amount of formaldehyde should be added before carrying out carboxylgroup titration. The reagents were standardized against 6-amino-caproic acid as primary standard. Both conductometric and potentiometric methods gave satisfactory titration curves, and amino and carboxyl groups could be titrated successively in the same solution. The indicators used in visual titrations were bromophenol blue for amino-group and phenolphthalen-thymol blue (6:1) for carboxyl-group. Sharp color changes at end-points were observed.The number average molecular weights obtained for three polymer samples by either aminogroup titration or carboxyl-group titration with these three methods were in good agreement. But the molecular weights obtained from amino-group titration were higher than those from carboxylgroup titration in all cases.

聚已内醯胺的端基滴定测定分子量,可以用同一溶剂[苯甲醇,甲醇-水(2:1)混合溶剂],在同一温度(室温)时用電導、電位或指示剂法分别先後进行氨基和羧基的滴定。滴定剂用标准盐酸和氢氧化鉀的甲醇-水溶液(约0.03N),電導法及電位法滴定羧基時另加甲醛抑制氨基,所得滴定曲线良好。指示剂法的终點均清晰。三法分别自氨基或羧基测得的聚合物数均分子量相互一致。确立了用这三种方法进行端基滴定的可靠性。但是同一试样自氨基测得的分子量,一般均高於自羧基测得的分子量。

Isotopic exchange reactions of sulfur-containing compounds (i. e. carbon disulfide, thiophosphoryl chloride, ethyl phosphonothionic dichloride, phenyl phosphonothionic dichloride, diethyl phosphorochloride thionate, triethyl phosphorothionate, diethyl disulfide, ethyl mercaptan) with ~(35)S in the presence of aluminum chloride were studied. With the first four compounds the reactions proceeded rapidly and smoothly, giving chemical yields of 70~95%. Radiochemical purity of these four products was identified by...

Isotopic exchange reactions of sulfur-containing compounds (i. e. carbon disulfide, thiophosphoryl chloride, ethyl phosphonothionic dichloride, phenyl phosphonothionic dichloride, diethyl phosphorochloride thionate, triethyl phosphorothionate, diethyl disulfide, ethyl mercaptan) with ~(35)S in the presence of aluminum chloride were studied. With the first four compounds the reactions proceeded rapidly and smoothly, giving chemical yields of 70~95%. Radiochemical purity of these four products was identified by the preparation of derivatives. With a high ratio of sulfur compound to ~(35)S, the radiochemical yield could approach the chemical yield. This method proved to be a good method for preparing ~(35)S labelled compounds. Compounds containing both P=S and R—O—P linkages, such as diethyl phosphorochloride thionate and triethyl phosphorothionate, exchanged only slightly, probably as a result of the side reaction of R—O—P with aluminum chloride. Diethyl disulfide exchanged about 12%, and ethyl mercaptan did not exchange at all.In connection with the mechanism of catalytic action of aluminum chloride, the following phenomena were observed: A complete exchange could be effected when carbon disulfide was heated at 100℃ for 1 hr or thiophosphoryl chloride heated at 80℃ for 20 min. These reactions proceeded with color change (when darkish aluminum chloride was used, no color change could be observed indicating no exchange). As it seemed quite possible that these reactions proceeded through a radical mechanism, an ESR study was undertaken. Signals were observed, and both showed three lines, with g values 2.0039, 2.0052, 2.0072 (DPPH used as a standard) for thiophosphoryl chloride and 2.0046, 2.0065, 2.0067 for carbon disulfide, We suppest that aluminum chloride as a strong Lewis acid might attack and open the eight membered ring of elemental sulfur, and the linear chain thus formed suffered homolytic fission and provided sulfur radicals which could attack and exchange with the sulfur atom of other sulfur compounds.

研究了~(35)S与C=S、P=S、C—S—S—C、C—SH等类型硫化物用三氯化铝催化的交换反应。二硫化碳、硫代磷酰氯、乙基硫代膦酰二氯、苯基硫代膦酰二氯等用此法交换,均得到良好的化学产率与放射产率。二硫化碳或硫代磷酰氯与三氯化铝、硫共热,显示三个顺磁共振峰,因此初步推测交换反应为自由基反应。含有R—O—P键的P=S类化合物与三氯化铝发生副反应,故未能很好交换。二乙基化二硫的交换率颇低,乙硫醇则无交换。

In this paper a modified procedure for the synthesis of the reagent Ferriphene, 4-chloro-2,6-di(hydroxymethyl) phenol, was desorided. Paraformaldehyde reaot with p-chlorophenol at 60~70℃ for 2~3 hr using solid NaOH as catalyst. The yield of the crude product was 98%.This reagent reacted with iron (III) to form an orange-red complex at pH 6.4. The formula of this complex might be expressed as Fe~(3+):L=1:3 with a stability constant of 1.7×10~4, where L represented Ferriphene. The orange-red complex formed showed...

In this paper a modified procedure for the synthesis of the reagent Ferriphene, 4-chloro-2,6-di(hydroxymethyl) phenol, was desorided. Paraformaldehyde reaot with p-chlorophenol at 60~70℃ for 2~3 hr using solid NaOH as catalyst. The yield of the crude product was 98%.This reagent reacted with iron (III) to form an orange-red complex at pH 6.4. The formula of this complex might be expressed as Fe~(3+):L=1:3 with a stability constant of 1.7×10~4, where L represented Ferriphene. The orange-red complex formed showed a maximum absorption at 480 nm. The molar absorptivity was 6.4×10~3. A great variety of common ions, except easily hydrolyzed ions such as Ti~(4+),Sn~(2+), Cr~(3+), as well as some complexing ions such as PO_4~3, tartrate and citrate, showed no interference with Fe~(3+). These properties might be utilized to give a sensitive and selective method for the determination of micro amounts of Fe~(3+). The linear calibration curve was obtained in the range of 0.1~50μg·ml~(-1) of Fe~(3+). It could also be used to determine the Fe~(3+) up to 170μg·ml~(-1) if differential spectrophotometry is used. The method was simple and rapid, and could be directly applied to samples of soils and rocks. The results obtained by our method were satisfactorily in agreement with other methods of Fe~(3+) determination. The relative error was less than 5%.The recommended procedure is as follows: Put 1~2 ml of acid sample solution into a 10ml graduated test tube, add 4 ml of 1% alcoholic Ferriphene solution, neutralize with 0.2 N NaOH until the color changes from blue to violet-red, then add 1.5 ml HOAc-NaOAc buffer solution (pH 6.4), dilute to the mark with water, stir and measure the absorbance at 480 nm with a cell of 1~3cm thickness.

对氯苯酚与多聚甲醛在氢氧化钠存在下70℃反应3小时,即得粗产率98%的4-氯-2,6-二(羟甲基)苯酚(试铁酚).实验表明铁(III)-试铁酚在pH6.4时,可生成稳定的橙红色络合物,吸收峰在480nm处,摩尔吸收系数为6.4×10~3可用于铁(III)的定量测定.本法的优点是选择性较高,测定范围广,方法简便、迅速,可用于土壤、岩石等样品中铁的直接测定.本法与其它方法测得的结果一致.

 
<< 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color change的内容
在知识搜索中查有关color change的内容
在数字搜索中查有关color change的内容
在概念知识元中查有关color change的内容
在学术趋势中查有关color change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