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电子转移    
相关语句
  electron transfer
    FRONTIER MOLECULAR ORBITAL THEORY CONSIDERATION FOR ELECTRON TRANSFER PROCESS ACROSS SULFIDE MINERAL-SOLUTION INTERFACE
    硫化矿-溶液界面电子转移的前线分子轨道理论讨论
短句来源
    The result showed that galena surface state interacted with adsorbates not only in overlap of orbitals,but in electron transfer between them.
    结果表明:方铅矿表面态在与外来吸附质相互作用时,不仅有轨道重迭而且发生电子转移
短句来源
    The energy level diagrams showing the interactions between the two mineral semiconductors and O2 and HS-were drawn and used to explain the micro-mechanisms of electron transfer involved in the collectorless flotation process of galena and pyrite, which includes self-induced flotation and lsa2S-indured flotation.
    计算结果画成方铅矿和黄铁矿半导体与分子氧和HS-离子作用的能级图,从电子转移微观层次上解释这两类矿物的无捕收剂浮选机理(包括自诱导浮选和硫化钠诱导浮选)。
短句来源
    The surface oxidation of galena and the micro-process of electron transfer involved in the oxidation have been stu died through voltammetry and quantum chemical calculation.
    伏安曲线和量子化学计算分别用来研究方铅矿表面的阳极氧化和氧化过程中电子转移的微观机制。
短句来源
  electronic transfer
    APPLICATION OF NUMBER OF ELECTRONIC TRANSFER IN CHEMICAL REACTION TO STUDY OF STRUCTURE-REACTIVITY RELATIONSHIP OF FLOTATION REAGENTS
    化学反应电子转移数判据在浮选捕收剂结构与性能关系的应用研究
短句来源
    The number of electronic transfer Δ N=(x A- x B)/2( η A+ η B),which based on the concepts of absolute electronegativity, x , absolute hardness, η , and chemical potential, μ , in chemical reaction is first applied to the study of structure reactivity relationship of flotation reagents.
    首次以化学势 μ、绝对电负性x、绝对硬度 η概念为基础 ,推导出化学反应电子转移数ΔN =xA-xB2 (ηA+ ηB) ,应用于浮选捕收剂结构与性能关系的研究。
短句来源
    The flotation mechanism is reasonably explained, and several electronic transfer styles of flotation reagents with the galena surface are discussed. The p π conjugate system of mercaptobenzo flotation reagent is very important in flotation, and the molecular number of monolayer saturation absorbing in unit area of galena surface calculated is in correspondences with the experimental value.
    确定了矿物相的最可几计算模型 ,提出了合理的吸附作用模型及浮选剂在矿物表面的吸附排列方式 ,对其吸附作用机理及吸附剂与矿物表面之间的多种电子转移形式作了合理解释 ,发现巯基苯并类浮选剂的p π共轭结构对浮选作用有重要的影响 ,从理论上确定的矿物表面单位面积内单层饱和吸附分子数与实验值接近 .
短句来源
  electronic transfer
    APPLICATION OF NUMBER OF ELECTRONIC TRANSFER IN CHEMICAL REACTION TO STUDY OF STRUCTURE-REACTIVITY RELATIONSHIP OF FLOTATION REAGENTS
    化学反应电子转移数判据在浮选捕收剂结构与性能关系的应用研究
短句来源
    The number of electronic transfer Δ N=(x A- x B)/2( η A+ η B),which based on the concepts of absolute electronegativity, x , absolute hardness, η , and chemical potential, μ , in chemical reaction is first applied to the study of structure reactivity relationship of flotation reagents.
    首次以化学势 μ、绝对电负性x、绝对硬度 η概念为基础 ,推导出化学反应电子转移数ΔN =xA-xB2 (ηA+ ηB) ,应用于浮选捕收剂结构与性能关系的研究。
短句来源
    The flotation mechanism is reasonably explained, and several electronic transfer styles of flotation reagents with the galena surface are discussed. The p π conjugate system of mercaptobenzo flotation reagent is very important in flotation, and the molecular number of monolayer saturation absorbing in unit area of galena surface calculated is in correspondences with the experimental value.
    确定了矿物相的最可几计算模型 ,提出了合理的吸附作用模型及浮选剂在矿物表面的吸附排列方式 ,对其吸附作用机理及吸附剂与矿物表面之间的多种电子转移形式作了合理解释 ,发现巯基苯并类浮选剂的p π共轭结构对浮选作用有重要的影响 ,从理论上确定的矿物表面单位面积内单层饱和吸附分子数与实验值接近 .
短句来源
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  electron transfer
Photoinduced intramolecular electron transfer process from C60 moiety to carbazole moiety has been studied by nanosecond laser flash photolysis.
      
The electron transfer coefficient and apparent reaction rate constant were determined to be 0.861 and 1.27 s-1.
      
This causes a significant increase in the efficiency of further electron transfer to the primary quinone acceptor as compared to a system with two absolutely symmetric electron transfer branches.
      
Reactions of electron transfer from the primary to secondary quinone acceptors and from the multiheme cytochrome c subunit to photoactive bacteriochlorophyll dimer were used as probes of electron transport efficiency.
      
The thermoinduced transition of the acceptor complex to the conformational state facilitating electron transfer to the secondary quinone acceptor was studied.
      
更多          
  electronic transfer
The temperature dependence and rate of the Z1-center formation is in agreement with the corresponding results on FA-center formation, demonstrating that Z1-centers are formed as the consequence of an ionic process and not a mere electronic transfer.
      
This work indicates that the excitation to the first and second singlet induces an electronic transfer from the heteroatom in the case of ortho and para derivatives; for meta compounds, the same phenomenon occurs for the four first singlets.
      
Electronic transfer processes studied at different time scales by selective resonant core hole excitation of adsorbed molecules
      
Direct electronic transfer of PACS images reduces the number of steps involved in creating publication-quality images as well as providing the means to produce high-quality radiographic images in a digital environment.
      
Electronic transfer in spinel chalcogenides:119Sn M?ssbauer spectroscopy and7Li N.M.R.
      
更多          
  electronic transfer
The temperature dependence and rate of the Z1-center formation is in agreement with the corresponding results on FA-center formation, demonstrating that Z1-centers are formed as the consequence of an ionic process and not a mere electronic transfer.
      
This work indicates that the excitation to the first and second singlet induces an electronic transfer from the heteroatom in the case of ortho and para derivatives; for meta compounds, the same phenomenon occurs for the four first singlets.
      
Electronic transfer processes studied at different time scales by selective resonant core hole excitation of adsorbed molecules
      
Direct electronic transfer of PACS images reduces the number of steps involved in creating publication-quality images as well as providing the means to produce high-quality radiographic images in a digital environment.
      
Electronic transfer in spinel chalcogenides:119Sn M?ssbauer spectroscopy and7Li N.M.R.
      
更多          
  其他


Original and oxidized galena surfaces and their xanthate adsorption system are calculated respectively by means of CNDO/2 method in quantum chemistry. The charge distribution and bonding character of those surfaces, the flotation mechanism of galena and the influence of oxygen on galena flotation are discussed. The result showed that galena surface state interacted with adsorbates not only in overlap of orbitals,but in electron transfer between them. When oxygen adsorpted, the HOMO of surface, which is mainly...

Original and oxidized galena surfaces and their xanthate adsorption system are calculated respectively by means of CNDO/2 method in quantum chemistry. The charge distribution and bonding character of those surfaces, the flotation mechanism of galena and the influence of oxygen on galena flotation are discussed. The result showed that galena surface state interacted with adsorbates not only in overlap of orbitals,but in electron transfer between them. When oxygen adsorpted, the HOMO of surface, which is mainly composed of P-orbitals of sulphur atoms, acts as an electron donor, while the LUMO,which is mainly composed of P-orbitals of lead atoms, acts as an electron acceptor when xanthate anions are adsorpted. The role of oxygen, which enhanced electron-positivity of surface and weakened Pb-S bonds, is favourable for adsorption of xanthate and flotation of galena. In addition, it was demonstrated that oxidation products (SO)tended to escape from surface toward solution to exchange with xanthate anions in solution. As a result, galena could be flotated due to forming lead xanthate. The flotation of oxidized galena follows an ion-exchange mechanism, and the hypothesis proposed by Sutherland K.L. and Wark J.W. is supported.

用量子化学CNDO/2方法计算了清洁的和氧化的方铅矿表面以及它们对黄药(黄原酸盐)的吸附体系。结果表明:方铅矿表面态在与外来吸附质相互作用时,不仅有轨道重迭而且发生电子转移。吸附氧时,表面HOMO的电子向氧转移;吸附黄药时,表面LUMO接受黄原酸的电荷。由于氧的作用使表面正电性增强,有利于黄药吸附和方铅矿的浮游。而且表面氧化产物(SO_n)~(2-)易进入溶液与矿浆中的黄药离子交换。结果表面生成黄原酸铅而浮游,构成一种离子交换机理。支持了Sutherland K.L.等的假说。

The energy band structure diagrams of galena and pyrite semiconductors and the energy of HOMO and LUMO for oxygen molecule and HS- ion were obtained through quantum-mechanics calcluations. The energy level diagrams showing the interactions between the two mineral semiconductors and O2 and HS-were drawn and used to explain the micro-mechanisms of electron transfer involved in the collectorless flotation process of galena and pyrite, which includes self-induced flotation and lsa2S-indured flotation. The results...

The energy band structure diagrams of galena and pyrite semiconductors and the energy of HOMO and LUMO for oxygen molecule and HS- ion were obtained through quantum-mechanics calcluations. The energy level diagrams showing the interactions between the two mineral semiconductors and O2 and HS-were drawn and used to explain the micro-mechanisms of electron transfer involved in the collectorless flotation process of galena and pyrite, which includes self-induced flotation and lsa2S-indured flotation. The results have shown that the P-type semiconductor (pyrite as a typical one) displayed a good Na2S-induced flotation behavior, but the N-type one (galena as a typical one) a good self-induced flotation behavior. The electron carrier density (ne) to cavity carrier density (np) ratio was considered as a parameter of evaluating the collectorless flotation. The self-induced flotation becomes better with the increase of ne /np ratio, while the Na2S-induced flotation improves with the increase of np/we ratio.

用量子力学计算得到了方铅矿(PbS)和黄铁矿(FeS_2)的半导体能带图,以及分子氧和HS-离子的HOMO和LUMO的能量。计算结果画成方铅矿和黄铁矿半导体与分子氧和HS-离子作用的能级图,从电子转移微观层次上解释这两类矿物的无捕收剂浮选机理(包括自诱导浮选和硫化钠诱导浮选)。结果表明,P型半导体(以黄铁矿为典型代表)具有良好硫化钠诱导浮选行为,N型半导体(以方铅矿为典型代表)具有良好自诱导浮选行为。电子载流子浓度(n_e)与空穴载流子浓度(n_p)之比值可以作为一个参数来判断无捕收剂浮选行为:n_c/n_p值大,自诱导浮选行为好;n_p/n_e值大,硫化钠诱导浮选行为好。

The effective potential range of self-induced flotation of galena and its lower and upper limits have been determined. The results of thermody namical calculation are used to explain the controlling action of the low er and upper potential limits. The surface oxidation of galena and the micro-process of electron transfer involved in the oxidation have been stu died through voltammetry and quantum chemical calculation. The hydro phobicity-hydrophilicity balance for the self-induced galena flotation has been established...

The effective potential range of self-induced flotation of galena and its lower and upper limits have been determined. The results of thermody namical calculation are used to explain the controlling action of the low er and upper potential limits. The surface oxidation of galena and the micro-process of electron transfer involved in the oxidation have been stu died through voltammetry and quantum chemical calculation. The hydro phobicity-hydrophilicity balance for the self-induced galena flotation has been established through surface solvent extraction and chemical analysis. The results show that the negativa sulfur ioas on galena surface are easily converted into neutral elementary sulfur. This conversion plays the key role in the self-induced flotatioa of galena. The flotation recovery is pro portional to the amount of neutral sulfur extracted from the galena sur face.

给出了方铅矿自诱导浮选电位区域和电位上下限,热力学计算表明了其意义。伏安曲线和量子化学计算分别用来研究方铅矿表面的阳极氧化和氧化过程中电子转移的微观机制。用表面溶剂提取—化学分析技术建立了自诱导浮选中方铅矿表面的琉水/亲水平衡关系。结果表明,方铅矿表面荷负电的硫原子能转变成电中性的单质硫,导致方铅矿表面疏水。方铅矿浮选回收率与中性硫提取量成正比。

 
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