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molybdenum
相关语句
  
     Molybdenum Efficiency of Winter Wheat Genotypes and Its Physiological Bases
     冬小麦不同基因型的效率及其生理基础
短句来源
     Synthesis, Characterization and Catalytic Epoxidation of Molybdenum (Ⅵ) Complexes with Schiff Base Ligands and the Ligands Supported on Mixed Zirconium Phosphate-phosphonates
     席夫碱配体、混合磷酸锆固载配体及其(Ⅵ)配合物的合成、表征及催化环氧化反应
短句来源
     The Comparative Study on the Content and Metallogenic Signifance of Gold, Molybdenum, Tungsten and Tin in Mantle Rocks from Eastem China
     中国东部地幔岩中的金、、钨、锡含量及其与成矿关系比较研究
短句来源
     Hydrothermal Synthesis and Characterization of Polyoxomolybdate, Molybdenum Phosphate and Coordination Polymer
     含有机组分氧簇、磷氧簇和配位聚合物的水热合成及性质研究
短句来源
     The Synthesis, Crystal Structure, EPR, UV, NMR and Properties Study of Molybdenum and Tungsten Complexes
     、钨金属配合物的合成、晶体结构、EPR、UV、NMR以及性质研究
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  “molybdenum”译为未确定词的双语例句
     DETERMINATION OF DIFFUSIVITY ON TUNGSTEN AND MOLYBDENUM IN DOUBLE GLOW DISCHARGE
     DETERMINATION OF DIFFUSIVITY ON TUNGSTEN AND MOLYBDENUM IN DOUBLE GLOW DISCHARGE
短句来源
     Complexation of Molybdenum (Ⅵ) with R-and S-malic Acid, The Crystal Structure of (NH_4)_4[(MoO_2)_4O_3(R-mal)_2]·6H_2O
     Complexation of Molybdenum(Ⅵ) with R-and S-malic Acid, The Crystal Structure of(NH_4)_4[(MoO_2)_4O_3(R-mal)_2]·6H_2O
短句来源
     Synthesis,Structure,IR and Raman Spectra of a Dinuclear Molybdenum(Ⅰ) Thiolato-Carbonyl Compound, Mo_2(SPH)_2(CO)_8
     Synthesis,Structure,IR and Raman Spectra of a Dinuclear Molybdenum(Ⅰ) Thiolato-Carbonyl Compound,〔Mo_2(SPH)_2(CO)_8〕
短句来源
     Synthesis of New Catalytic Material Molybdenum Nitride in Mixture of Nitrogen and Hydrogen
     Synthesis of New Catalytic Material Molybdenum Nitride in Mixture of Nitrogen and Hydrogen
短句来源
     Structure of Molybdenum Complex of Benzothiazole-2-thiolate(η ̄5-C_5H_5)Mo(CO)_2(C_7H_4NS_2)
     Structure of Molybdenum Complex of Benzothiazole-2-thiolate(η~5-C_5H_5)Mo(CO)_2(C_7H_4NS_2)
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  相似匹配句对
     BRAZING OF MOLYBDENUM
     钼的钎焊
短句来源
     Climax Molybdenum
     美国克莱马克斯钼公司
短句来源
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  molybdenum
The effect of ultrasound irradiation on molybdenum trioxide has been investigated.
      
The physicochemical changes of MoO3 due to ultrasound irradiation have been attributed to the sonochemical cavity collapse onto the molybdenum trioxide particles.
      
Molybdenum isotope composition from Yangtze block continental margin and its indication to organic burial rate
      
Molybdenum, at a concentration lower than half the concentration of tungsten, as well as iron, selenium, and pterin at concentrations 2.5 times higher than that of tungsten, had no effect on tungsten determination by this method.
      
During the formation and ripening of beans in yellow lupine, their intactness may be increased by treatment of the plants with the microelement molybdenum or the growth factor 24-epibrassinolide.
      
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The hydroquinone method has been applied to the determination of tungsten in ores. Tungsten ore is fused with Na_2O_2 and Na_2CO_3 and followed by extracting with hot water. Most of the interfering ions are thus removed except molybdenum which remains sn the solution with tungsten. Since the amount of molybdenum is usually low its interference can be prevented by the addition of suitable amount of Sncl_2 and H_3PO_4.The results obtained by this method are good even with Ores of high tungsten content...

The hydroquinone method has been applied to the determination of tungsten in ores. Tungsten ore is fused with Na_2O_2 and Na_2CO_3 and followed by extracting with hot water. Most of the interfering ions are thus removed except molybdenum which remains sn the solution with tungsten. Since the amount of molybdenum is usually low its interference can be prevented by the addition of suitable amount of Sncl_2 and H_3PO_4.The results obtained by this method are good even with Ores of high tungsten content (70%).

1.對苯二酚比色法测定鎢必須在濃硫酸溶液中進行顯色,少量水存在使顏色深度減低;可加入過量的對苯二酚溶液避免魧Ρ蕉尤芤河昧繛?0毫/25毫升,則允許的含水量為4毫升/25毫升。2.少量钼酸根的干擾可加入適量的SnCl_2—H_3PO_4掩蔽,但若钼的含量超過16微克/毫升時,必須預先進行分離。3.用對苯二酚法测定鎢礦中鎢的含量, 得到尚满意的結果;测定範圍可高達70%。應用此法测定所需時間約為重量法的五分之一。

The ethyl xanthate reaction for molybdenum is sensitive and is not interfered by tungsten, vanadium, chromium (Ⅲ) and uranium. Hence it is desirable to investigate it further as a method of determination. The results found are as follows:The acidity of the aqueous solution in which the molybdenum-xanthate complex forms should be adjusted to pH 1.11-1.56. And the complex is stable only for one minute in the media mentioned. The addition of acetone (2-25%) to the aqueous solution does not stabilize...

The ethyl xanthate reaction for molybdenum is sensitive and is not interfered by tungsten, vanadium, chromium (Ⅲ) and uranium. Hence it is desirable to investigate it further as a method of determination. The results found are as follows:The acidity of the aqueous solution in which the molybdenum-xanthate complex forms should be adjusted to pH 1.11-1.56. And the complex is stable only for one minute in the media mentioned. The addition of acetone (2-25%) to the aqueous solution does not stabilize the complex to a notable degree.For extraction of the molybdenum-xanthate complex, ten organic solvents, namely petroleum ether, benzene, toluene, chloroform, carbon tetrachloride, chlorobenzene, diethyl ether, isoamyl alcohol, amyl acetate and isobutyl methyl ketone, are tested with respect to (a) the stability of the complex in these solvents (using optical density of the extracts as a measure) and (b) the effectiveness of various solvents in extraction. The complex is most stable in petroleum ether and toluene (at least for three days). The color of the complex in benzene is stable for fourteen minutes; in chloroform, ten minutes; in chlorobenzene, seven minutes and in carbon tetrachloride, six minutes. On the other hand, diethyl ether, isoamyl alcohol, amyl acetate and isobutyl methyl ketone are unsuitable for extracting the complex. Under similar conditions, various amounts of moly bdenum are extracted with different organic solvents, and the results obtained are plotted in Fig. 3. From the curves, it is found that among the organic solvents studied the following ranges of molybdenum content obey Beer's law: in chlorobenzene, 0-0.4 mg Mo; in benzene and in toluene, 0-0.3 mg Mo; and in chloroform and in carbon tetrachloride, 0-0.2 mg Mo. Petroleum ether can only be used with very low concentrations of molybdenum, and this is in accordance with Malowan's result.

本文證實溶液酸度对乙黃原酸钼錯合物的穩定度有影響。溶液的酸度最好調節在pH1.11—1.56之间。該钼錯合物生成后在水中僅穩定一分钟,故應在此期間以內用有機溶劑抽提。在丙酮-水溶液中,該钼錯合物亦不穩定。本文試驗了十種有機溶劑作抽提劑,比较了乙黄原酸钼錯合物在其中的穩定性和不同量钼的抽提效果。找出對該钼錯合物的穩定性而言,以石油醚和甲苯為最好。苯、三氯甲烷、四氯化碳和氯代苯次之(在一定的時間內可以使用),而乙醚、異戊醇、乙酸戊酯和異丁基乙酮,則均不適於作抽提之用。对抽提效果而言,氯代苯在钼含量0—0.4毫克範圍內遵循Beer定律;苯及甲苯次之;三氯甲烷或四氯化碳又次之;石油醚最差。根據上述,擬推荐甲苯作為最适宜之抽提劑。

Modifications of the method of potentiometric titration with chromous chloride in thedetermination of tungsten and molybdenum have been described.The optimum experimentalconditions are:(a) for tungsten,the concentration of HCl should not be less than 10 N and thetungsten concentration,not less than one milli-equivalent in 160 ml; (b) for molybdenum,the solution to be titrated should ,be 6 N in HCl and contain about one gram of KCNS in 80 ml.The addition of KCNS gives a sharp potential jump at the...

Modifications of the method of potentiometric titration with chromous chloride in thedetermination of tungsten and molybdenum have been described.The optimum experimentalconditions are:(a) for tungsten,the concentration of HCl should not be less than 10 N and thetungsten concentration,not less than one milli-equivalent in 160 ml; (b) for molybdenum,the solution to be titrated should ,be 6 N in HCl and contain about one gram of KCNS in 80 ml.The addition of KCNS gives a sharp potential jump at the end-point.Under such conditions thetitration may be carried out with non-compensation method at room temperature.Themethod has been applied to the determination of tungsten in wolframite and scheelite,and ofmolybdenum in molybdenite with results agreeing with those obtained by gravimetric methods.Such a determination may be accomplished within three hours.

测定钨精砂中的钨和辉钼矿中的钼可用氯化亚铬的电位滴定法来代替经典的重量法。测定钨的实验条件是盐酸浓度保持10N 左右,每160毫升钨的含量不低于1毫克当量。测定钼的条件是盐酸浓度为6N,加入硫氰酸钾约为1克/80毫升。在上述实验条件下,钨、钼都可以用不补偿法在室温下滴定。分析结果基本上与重量法符合,而时间缩减为3小时。

 
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