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color change
相关语句
  颜色变化
    In the presence of some special surfactants such as Arabic gum, polyvinyl alcohol or their mixture, the associated ion is soluble in water, accompanied with very sensitive color change.
    在某些特殊型表面活性剂,如阿拉伯树胶、聚乙烯醇或其混合溶液的存在下,离子缔合物溶于水,并伴有极灵敏的颜色变化
短句来源
    These films had a reversible color change when lithium was electrochemically injected.
    伴随着Li+的电化学注入,这些薄膜呈现出可逆的颜色变化
短句来源
    Based on XRD analysis, the effect of the ratio of Al to Sr on the host structure was discusse d and an explanation on the color change was proposed.
    通过XRD分析,讨论了铝锶比例对发光粉基质结构的影响,并对发光颜色变化的原因作了进一步的解释。
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  “color change”译为未确定词的双语例句
    Those color centers at deep depth will be stable and mainly responsible for color change, those with shallow depth attribute to the long-lasting luminescence. The intensity and time of afterglow corresponding to 5D4->7F5 transition of Tb3+ were found to be increased with increasing ZnO content.
    这些色心中能级深的色心将稳定存在于基质中,导致光致变色,陷阱能级浅的色心引起长余辉,所以随着ZnO含量的提高,玻璃中Tb~(3+)的~5D_4→~7F_5跃迁对应的余辉发光初始强度增大、寿命变长,同时光致变色程度增大。
短句来源
    The aluminium is back titratedwith zinc at pH 4.5~6.5 to a color change from bright yellow to deep purple,the end point isvery sharp.
    利用此体系以3,5-diBr-PADAP为指示剂,锌盐回滴法测定铁矿中的Al_2O_3,溶液颜色由亮黄变为紫红,终点突跃敏锐,Fe ̄(3+)的黄色不影响终点的观察。
短句来源
    The Au3+ ions are reduced to Au+ ion with the color change from orange to colorless by ascorbic acid (AA) in aqueous solution of CTAB (cetyltrimethylammonium bromide). With the effect of γ-irradiation, the Au+ ions can be further reduced to Au0, and then form low aspect ratio gold nanorods in the rod-like CTAB micelles induced by a trace amount of Ag+.
    在十六烷基三甲基溴化铵(CTAB)水溶液中,抗坏血酸(AA)将橙黄色的Au3+还原为无色的Au+,在γ射线产生的水合电子的作用下,Au+进一步还被原成Au0,并在微量的Ag+诱导所产生的CTAB胶束中生长成为Au纳米棒。
短句来源
    At the same time,from the color change of synthesized diamond,we can see that it is an effective method to improve the content of boron in diamond crystal.
    同时,通过不同添加比例的硼合成出金刚石的颜色,可得知该方法对提高金刚石内硼含量的有效性。
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  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.
      
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The association of lead iodide complex anion and crystal violet (a basic organic dye) is studied. In the presence of some special surfactants such as Arabic gum, polyvinyl alcohol or their mixture, the associated ion is soluble in water, accompanied with very sensitive color change. Its absorption peak lies in 530μm and apparent molar absorption coeffi- cient is up to 1.3×10~5. Lead will obey Beer's Law in the range of 0-12 μg/25 mL. The preferable pH is 1.5-2.0. Most of the metal ions have no interference...

The association of lead iodide complex anion and crystal violet (a basic organic dye) is studied. In the presence of some special surfactants such as Arabic gum, polyvinyl alcohol or their mixture, the associated ion is soluble in water, accompanied with very sensitive color change. Its absorption peak lies in 530μm and apparent molar absorption coeffi- cient is up to 1.3×10~5. Lead will obey Beer's Law in the range of 0-12 μg/25 mL. The preferable pH is 1.5-2.0. Most of the metal ions have no interference on the determin- ation. Ferric ion must be reduced to its lower valence with ascorbic acid and the other metal ions such as Cu~(2+), Hg~(2+), Ag~+, Bi~(3+), Sn~(2+) and Sb~(3+) can be masked by ascorbic acid-thiourea and phosphoric acid-sodium dihydrogen phosphate. However, Cd~(2+) and ClO_4~- have serious effects on the determination so that care must be taken when they exist. This method has been used in the determination of micro lead in zinc plating bath, and proved to be satisfact- ory.

本文论述了碘化铅络阴离子与碱性有机染料结晶紫之间的缔合反应。在某些特殊型表面活性剂,如阿拉伯树胶、聚乙烯醇或其混合溶液的存在下,离子缔合物溶于水,并伴有极灵敏的颜色变化。最大吸收峰位于530μm,表观摩尔吸光系数高达1.34×10~5。铅在0~12微克/25毫升范围内遵守比耳定律。适宜的酸度范围为pH1.5~2.0。大多数金属离子不干扰测定,铁离子必须用抗坏血酸还原成低价。Cu~(2+),Hg~(2+),Ag~+,Bi~(3+),Sn~(2+),Sb~(3+)等金属离子能用抗坏血酸-硫脲和磷酸-磷酸氢二钠溶液掩蔽,但Cd~(2+)与C10_4~-强烈干扰测定,所以必须注意。该法已用于直接测定碱性镀锌溶液中的微量铅,并获得了满意的结果。

new indicator,3,5-diBr-PADAP-SDS system has been studied and applied to the complexometric determination of aluminium with satisfactory results. The aluminium is back titratedwith zinc at pH 4.5~6.5 to a color change from bright yellow to deep purple,the end point isvery sharp.

在pH4.5~6.5条件下,Zn与3,5-diBr-PADAP及SDS形成可溶性紫红色络合物。利用此体系以3,5-diBr-PADAP为指示剂,锌盐回滴法测定铁矿中的Al_2O_3,溶液颜色由亮黄变为紫红,终点突跃敏锐,Fe ̄(3+)的黄色不影响终点的观察。

A sequential photometric titration method for the determination of iron(Ⅲ) and neodymium(Ⅲ) is described with EDTA as the titrant and with Chrome Azuol S(CAS) and cetyl pyridium bromide(CPB)-ethanol as a micellar coordination indicator system,i.e.,a multi-component metallochromic indicator.The suitable PH ranges for iron and neodymium are 2.3~3.2 and 6.0~8.6,respectively.For the visual titration of iron(Ⅲ),the end-point color change is from blue-violet to pink.Its contrastΔλequals to 130 nm.Its molar absorptivity...

A sequential photometric titration method for the determination of iron(Ⅲ) and neodymium(Ⅲ) is described with EDTA as the titrant and with Chrome Azuol S(CAS) and cetyl pyridium bromide(CPB)-ethanol as a micellar coordination indicator system,i.e.,a multi-component metallochromic indicator.The suitable PH ranges for iron and neodymium are 2.3~3.2 and 6.0~8.6,respectively.For the visual titration of iron(Ⅲ),the end-point color change is from blue-violet to pink.Its contrastΔλequals to 130 nm.Its molar absorptivity ε(630) is 1.14×105L·mol-1·cm-1,while the linear range is 0~2.4 μg/mL with a correlation coefficient of 0.9994.On the other hand,the color change for neodymium titration is from green to orange-yellow.Its contrast Δλis greater than 180 nm. Its molar absorptivity ε(630)is 7.6×104L·mol-1·cm-1,while the linear range is 0~3.7μg/mL with a correlation coefficient of 0.9994.The method has been successfully applied to the analysis of synthetic samples of iron,neodymium and boron without separation. The relative standard deviations for Fe(Ⅲ) and Nd(Ⅲ) are 1.76% and 2.86%, respectively.The recoveries are 96%~104%.

提出以Fe(3+)(Nd(3+)-CAS-CPB-C2H5OH作为不经分离、高敏、连续光度配合滴定混合物中Fe(3+)和Nd(3+)的多元胶束配合指示体系。滴定Fe(3+)和Nd(3+)的适宜pH分别为2.3~3.2和6.0~8.6。用EDTA目视滴定Fe(3+)时,终点处由蓝紫变粉红色,对比度大(Δλ=130nm)、灵敏度高(配合物摩尔吸光系数ε(630)=1.14×105L·cm(-1)·mol(-1),至少可检测0.4μg/mL,滴定线性范围为0~2.8μg/mL。线性相关系数为0.9994;目视滴定Nd(3+)时,终点处由绿色变橙黄,Δλ>180nm,ε(630)=7.6×104,至少可检测1μg/mL,滴定线性范围0~3.7μg/mL,线性相关系数0.9994。对于铁钕硼混合物样品则不经分离在630nm处连续光度滴定,可更精密、高敏、准确地确定终点,变异系数1.76%~2.86%,标准加入回收率96%~104%,且简便、快速。

 
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