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violet     
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     Catalytic Kinetics Spectrophotometry for Determination of Trace Copper Using Ethyl Violet and H_2O_2 System
     乙基-H_2O_2体系催化动力学光度法测定痕量铜
短句来源
     potassium bromate is 3 5 mL,pyrocatechol violet is 2 5 mL;
     溴酸钾 3 5mL ; 邻苯二酚 2 5mL ;
短句来源
     Determination of copper(Ⅱ) by catalytic kinetic spectrophotometry with H 2O 2 catechol violet
     H_2O_2邻苯二酚催化动力学光度法测定痕量铜(Ⅱ)
短句来源
     the dosage for pigments/FWAs was: pigment violet 0.2 kg/t, pigment blue 0.03 kg/t, FWA7.5 kg/t.
     颜料/荧光增白剂组合的用量为颜料0.2kg/t,颜料蓝0.03kg/t,荧光增白剂7.5kg/t。
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     Synthesis of Acid violet 2R
     酸性2R的合成
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  紫色
     BLUE AND VIOLET ELECTROLUMINESCENCE IN ZnSe_xS_(1-x) MIS DIODES
     ZnSe_xS_(1-x) MIS发光二极管的兰色和紫色电致发光
短句来源
     The Analysis and Verification of Structure of Dye for Foron Black RD-3G 300% Ⅰ: The Study of Blue and Violet Component in the Dye
     Foron Black RD-3G 300%染料的结构分析和验证(Ⅰ)──蓝色和紫色组分的研究
短句来源
     In the buffer solution of borax,with Ph value of 9.5 and in the presence of CTMBA,a violet complex of BBTAQ and Ni(Ⅱ) with the ratio fo 4:1 is formed,λ_max=608nm,ε=1.15×10~5l·mol(-1)·cm(-1).
     在pH为9.5的硼砂缓冲溶液中和CTMAB存在下,BBTAQ与Ni(11)形成4:1的紫色络合物,λ_(max)=608nm,ε=1.15×10~51·mol~(-1),Cm~(-1)。
短句来源
     When the concentration of substrate starch is 2 g/L and that of α-amylase is 0.5u/mL, the solution shows blue, violet and red for the reaction time of 0~2.5 minu, 2.5~5.5min and 5.5~13.5 min respectively. Beyond 13.5 min, the solution turns to colorless.
     当底物淀粉浓度为2g L,加入α 淀粉酶为0.5u mL时,0~2.5min呈蓝色,2.5~5.5min呈紫色,5.5~13.5min呈红色,13.5min后呈无色。
短句来源
     A jadeite gem having visible emission (red, yellow, violet) has been synthesized by doping Eu_2O_3, Dy_2O_3, CeO_2 of 0.01-0.1 mol under high pressure and high temperature. Their emission spectra were determined.
     在具有翡翠成份的原料中掺入0.01~0.1mol的Eu_2O_3、Dy_2O_3、CeO_2,经商温高压合成,分别茯得可发红、黄、紫色可见荧光的翡翠宝石。
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  紫罗兰
     Studies on the Cell Cycle Arrest and Apoptosis Induced by Tetrazolium Violet in C6 and C127 Cancer Cells
     四唑紫罗兰对大鼠胶质瘤C6细胞和小鼠乳腺癌C127细胞的细胞周期停滞和凋亡诱导的研究
短句来源
     1.Leaf and petiole explants of 31 varieties of African Violet can be induced to regenerate plantlet on MS+0.1mg/1 BA+0.1mg/1 NAA agar medium within 4—6 weeks.
     在试验的33个非洲紫罗兰(Saintpaulia ionantha Wendl.) 品种中,有31个品种的叶片和叶柄外植体可在 MS+BA 0.1nag/l+NAA 0.1mg/l 琼脂培养基上再生出有少量根的小植株。
短句来源
     In an air freight simulating experiment, cut violet flowers pretreated with preservative solutions containing different combinations of STS, AgNO 3, 6-BA, 8-HQC and sugar were kept in a specially sealed box for 36 h and their weight, case-life and flower quality in the vase water were observed.
     采用STS ,AgNO3 ,6 -BA ,8-HQC和蔗糖 ,配成 4组预处液 ,对紫罗兰切花进行预处理 ,随后在密封的鲜花专用箱中模拟空运 36h ,取出置于自来水的瓶插液中瓶插 ,观测其鲜重变化、瓶插寿命、开花品质。
短句来源
     Tissue culture of African Violet
     非洲紫罗兰的组织培养
短句来源
     An Analysis of the Modernity of the Youth Image Presentedin the Metropolitan Narratives of Violet
     《紫罗兰》都市叙事中青年男女形象的现代性剖析
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  晶紫
     The detection limits of 8.0×10~(-10)mol/L of crystal violet and 60ng/ml of cobalt were obtained respectively, which correspond to minimum measurable absorbances of 1.2×10~(-8)and5.4×10~(-8).
     获得的结晶紫和钴的检测下限分别为8.0×10~(-10)mol/L和60ng/ml,对应的最小吸光度分别为1.2×10~(-8)和5.4×10~(-8)。
短句来源
     The results are obtained under the condition of pH 2.70, H_2O_2 340 mg·L -1 and Fe 3+ 28 mg·L -1 . After oxidation for 80 minutes, more than 99% crystal violet is degraded;
     当pH=2.70,H2O2=340mg·L-1,Fe3+=28mg·L-1时,结晶紫废水在80min下的脱色率大于99%,COD去除率达到60.1%.
短句来源
     The optimum conditions are as follows: [H_2SO_4]=0.13mol/L, [crystal violet]=1.2×10~(-4)mol/L, [PVA]=0.32%. The ion associate exhibit maximum absorption at 545nm.
     显色反应的条件是:[H_2SO_4]=0.13mol/L,(结晶紫)=1.2×10~(-4)mol/L,(聚乙烯醇)=0.32%。
短句来源
     Study on Degradation of Methyl Orange,Alizarine Red and Crystal Violet Using the Photocatalytic System of Mn~(2+)/H_2O_2
     Mn~(2+)/H_2O_2光催化体系对染料甲基橙、茜素红、结晶紫的降解研究
短句来源
     As the concentration of water inflow was 15mg/L, retention time was 24h and continuous operation, the decolorization rate of the mixed dyestuff wastewater reached 79.5%, decolorization rates of Congo red, crystal violet and methylene blue were 91.6%﹑65.4% and 6.9% respectively.
     当进水浓度为15mg/L,停留时间24h,连续式运行,混合染料废水脱色率达到79.5%,刚果红脱色率为91.6%,结晶紫为65.4%,次甲基蓝为6.9%.
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  violet
Synthesis and properties of oil-soluble butyl crystal violet lactone
      
The result of the dissolution experiment showed that solubility of BCVL in organic solvent was improved compared with crystal violet lactone (CVL).
      
It is established that the influence of ultra-violet radiation reveals itself, first of all, in changing temperature of samples, while the influence of irradiation by a flux of electrons is reduced to charge accumulation and discharges.
      
The SPICAM experiment onboard the Mars-Express spacecraft includes sounding the Martian atmosphere in the ultra-violet (118-320 nm) and near IR (1-1.7 μm) ranges.
      
The SnO2(anode)/novolak resin + pyrocatechol violet/Al (cathode) diodes exhibited the highest EL intensity.
      
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This is a brief report of the measurements by the method of critical penetration frequency of the maximum intensities of ionization in the ionospheric layers during the partial solar eclipse of June 19, 1936 at Shanghai. The results support the ultra-violet light theory of ionization in the F1 layer. For the E layer these results suggest that a considerable part of the ionization may be due to agents different from ultraviolet light.

本文报告公历一九三六年六月十九日在上海日偏蚀时用临界频率法测量天空电离层游离强度之变化就F_1层所显之结果而论,足为紫外线作用论强有力之一证惟按E层所显之结果则显出该层游离化之主因颇有一部分非紫外线之作用。

Vanillalrhodanine was found to be an excellent reagent for silver ions. Its 0.2 percent solution in acetone gives a brownish violet precipitate with silver ions in ammoniacal solution. Limit of identification: 0.01γ. Concen- tration limit: 1∶5,000,000. Merecric and merourous ions give same reactions, but they can be removed by the addition of aqueous ammonia and the test is to be carried out in the filtrate. Ferric ions, when present in high concentra- tions, interfere the observation of silver.

3甲氧基4羥基亞苄羅丹寧可以用作銀離子的斑點試劑。其千分之二丙酮溶液與銀離子在含氨溶液中生成棕紫色沈澱。鑑定限度為0.01_γ,濃度界限爲1∶5,000,000。普通離子除汞外皆不干擾。鐵鹽在濃度高時,才妨碍銀的鑑定。

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。

 
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