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mn
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    Model Complexes of Manganese-Containing Metalloenzyme: Studies on Synthesis, Structure and Properties of Mn(Ⅲ),Mn(Ⅳ) and Mixed-Valence Multnuclear Manganese Complexes
    金属酶模型配合物:Mn(Ⅲ)、(Ⅳ)及混合价多核配合物的合成、结构及性质研究
短句来源
    Hydrothermal Synthesis and Charaterization of Mn(Ⅱ)-substituted Aluminophosphates and Manganese Phosphates
    Mn(Ⅱ)取代磷酸铝和磷酸微孔化合物的水热合成与表征
短句来源
    Automatic Analyzer of Six Elements Mn、Cr、P、Mo、V、Ni in Alloy Steels
    合金钢中、铬、磷、钼、钒、镍六元素自动分析仪
短句来源
    A STUDY ON THE ORDER OF EXTRACTION FOR Mn(Ⅱ) AND Co(Ⅱ) WITH HDEHP
    二—(2—乙基己基)磷酸萃取(Ⅱ)钴(Ⅱ)顺序的研究
短句来源
    COLOUR REACTION OF Mn(Ⅱ) WITH CHROMAZUROL S,1,10-PHENANTHROLINE AND CETYLTRIMETHYLAMMONIUM BROMIDE
    与铬天青S、1,10-邻菲啰啉、溴化十六烷基三甲基铵的显色反应
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    STOPPED-FLOW REVERSE FLOW INJECTION ANALYSIS FOR TRACE MANGANESE THE SYSTEM OF Mn~(2+)-NaH_2PO_2-KIO_4-NTA
    痕量锰的停流反相流动注射分析——Mn~(2+)-NaH_2PO_2-KIO_4-NTA催化体系
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    Study on Catalytic Spectrophotometric Determination of Trace Manganese --The System of Mn( Ⅱ )- NTA-NR-KI04
    催化光度法测痕量锰的研究——Mn(Ⅱ)—NTA—NR—KlO_4体系
短句来源
    Catalytic Kinetic Spectrophotometric Determination of Trace Mn(Ⅱ) (N,N-Dimethylaniline-Periodate System)
    痕量锰的动力学分光光度法测定(N,N-二甲基苯胺-NaIO_4体系)
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    STUDIES ON THE F-T PERFORMANCE OF IRON BASED ULTRAFINE CATALYSTS——Ⅰ. PERFORMANCE OF Fe-Mn CATALYST, ACTIVE PHASES AND ROLE OF Mn
    铁基超细粒子催化剂的F-T反应性能研究——Ⅰ.Fe-Mn催化剂的反应性能、活性相结构及锰的作用
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    Promoting Effect of Mn in the Cu Mn/Al 2O 3 Catalysts for Synthesis of Methanol
    甲醇合成催化剂Cu-Mn/Al_2O_3中锰的助催化作用
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    Organic-Inorganic Hybridizing and Grafting of Sharpless Catalyst and Mn(salen) Catalysts, and Heterogeneously Asymmetric Epoxidation Reaction
    Sharpless和Mn(salen)催化剂的有机—无机杂化和表面嫁接及不对称环氧化反应
短句来源
    Immobilization of Chiral Mn(salen) Catalysts in Nanopores and on Surface of Solid Supports and the Asymmetric Epoxidation of Unfunctionalized Olefins
    表面上和纳米孔中手性Mn(salen)催化剂的固载及其非官能团烯烃的不对称环氧化研究
短句来源
    The Radial Wave Function of Nonfree Mn(Ⅱ) and Its Electronic Structure
    非自由态Mn(Ⅱ)的径向波函数及其电子结构
短句来源
    Accelerative Effect of Ion Exchange Exerted by Mn(Ⅱ) in Hydrochloric Acid
    盐酸中Mn(Ⅱ)的加速离子交换效应
短句来源
    THE GEOMETRY CONFIGURATION OF Mn(H_2O)_6~(2+)——STUDY WITH CNDO/2 METHOD
    Mn(H_2O)_6~(2+)的几何构型讨论——用CNDO/2方法计算
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  mn
In this note it is shown that a necessary and sufficient condition for the existence of a P3-factorization of complete multipartite graph λKmn is (1) m≥3, (2) mn≡0 (mod 3) and (3) λ(m-1)n≡0(mod 4).
      
Let Sn be the symmetric group, gi+=(123i), gi-=(li32) and Mn+={gi+∶4≤i≤n}, then Mn+ is a minimal generating set of Sn, where n≥5.
      
It is proved that Cayley graph Cay (Sn, Mn+∩Mn-) is Hamiltonian and edge symmetric.
      
Let Mn be a closed spacelike submanifold isometrically immersed in de Sitter space Spn+p (c).
      
Denote by R, H and S the normalized scalar curvature, the mean curvature and the square of the length of the second fundamental form of Mn, respectively.
      
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The volumetric method of determination of bismuth as proposed by Malaprade is based upon the fact that bismuth hydroxide can be converted into the trithiosulfatobismuth complex by first adding a large excess of sodium thiosulfate and then adding carefully dilute nitric acid to dissolve the hydroxide with methyl red as the indicator for control. The complex can be titrated with standard sodium or potassium hydroxide solution using phenolphthalein as an indicator. The chief reactions are: Bi(OH)_3+3S_2O_3"+SH~(?)→[Bi(S_2O_3)_3]'''+3H_2O...

The volumetric method of determination of bismuth as proposed by Malaprade is based upon the fact that bismuth hydroxide can be converted into the trithiosulfatobismuth complex by first adding a large excess of sodium thiosulfate and then adding carefully dilute nitric acid to dissolve the hydroxide with methyl red as the indicator for control. The complex can be titrated with standard sodium or potassium hydroxide solution using phenolphthalein as an indicator. The chief reactions are: Bi(OH)_3+3S_2O_3"+SH~(?)→[Bi(S_2O_3)_3]'''+3H_2O (1) 2[Bi(S_2O__)_3]'''+5OH'+NO_3'→(BiO)_2OH·NO_3+6S_2O_3''+2H_2O (2)The quantity of bismuth can be calculated from the consumed alkali according to equation (2).We have found that for samples of 0.1—0.17 gram of bismuth with the addition of ten to fifteen grams of sodium thiosulfate, the relative error of determination is ±0.5%, agreeing with the result of Malaprade. The following ions present up to the amount indicated respectively do not interfere with the determination of 0.1 gram of bismuth:(1)Pb (II), 80mg; Cr(III), 25mg in the presence of 15 grams of sodium thiosulfate;(2)Cu (II) and Co (II), 100 mg; Fe (III), 80 mg; Zn (II), 40 mg; Ca (II), 200 mg; Ag (I), 30 mg; Mo (VI), 30 mg in the presence of 10 grams of sodium thiosulfate;(3) Ni (II), 40mg in the presence of 10 grams of sodium thiosulfate, or 40—60 mg in the presence of 15 grams of sodium thiosulfate;(4)Cd and Mn.On the other hand, As (III, V), Cl' and SO_4" ions do interfere. The latter two anions form insoluble oxy-salts in dilute nitric acid. Accordingly any arsenic present in bismuth samples should be removed previously. As to tin, antimony and tungsten which usually occur in bismuth ores, they can be removed in the course of opening with concentrated nitric acid, which converts them respectively into the insoluble rnetastannic, meta-antimonic and tungstic acids.The total time for a complete titration is about half an hour, being five to ten times shorter than that required by the gravimetric methods. his rapid method is probably suitable for the determination of bismuth in ores etc.

用标准碱滴定硫代硫酸铋络合物的方法既属快速(约半小时),而又相当准确(铋含量在0.1—0.17克时,相对误差在±0.5%以下)。在0.1克的铋样中,曾经分别加入银、铅、铜、砷、铁、铬、锌、钴、钙、钙、钼等离子进行试验,只有砷发生干扰。溶液中不能有氯离子与硫酸根。

A method for the determination of traces of copper by its catalytic action on the reaction between phosphomolybdic acid and sodium thiosulfate has been proposed. The reaction rate is proportional to the concentration of copper in the range of 0.08-0.70 γ/ml. The relative deviation for a single determination is withia ±10%. A deviation of 1.5℃ for room temperatures in preparing the standard curves and in determination of copper in solutions may be tolerated without introducing noticeable error. 25 ml of the copper...

A method for the determination of traces of copper by its catalytic action on the reaction between phosphomolybdic acid and sodium thiosulfate has been proposed. The reaction rate is proportional to the concentration of copper in the range of 0.08-0.70 γ/ml. The relative deviation for a single determination is withia ±10%. A deviation of 1.5℃ for room temperatures in preparing the standard curves and in determination of copper in solutions may be tolerated without introducing noticeable error. 25 ml of the copper solution to be analyzed contains 4.0ml of 10-2M H2SO4, 2.0ml of 1% phosphomolybdic acid and 1.0 ml of 0.1 M Na2S2O3 solution.Na, K, NH4, Ca, Mg, Zu, Mn, Co, Ni, Cd up to lmg/25ml, Cl, NO3 up to 2×10-3M, WO4, H3BO3 up to 4 × 10-4M and Al, Cr, Bi up to 100 γ/25 ml do not interfere. While Fe, Fe, F, PO4, AsO4 and VO3, interfere with the determination of copper.The presence of vanadate promotes the catalytic action of copper. When the concentration of copper lies between 0.02-0.26 γ/ml, the reaction rate is proportional to the square of the concentration of copper.

在酸性溶液中铜催化Na_2S_2O_3还原磷钼酸为钼蓝的反应,可利用以制订测定微量铜的动力学分析法。测定铜的浓度范围是:0.08—0.70微克/毫升(1.2×10~(-6)M-10×10~(-6)M),铜的浓度在此范围内与反应速度成直线关系。用该方法测定铜,个别测定的相对偏差在±10%以内。测定试样与测绘工作曲线时,室温相差在1.5℃以内,对测定结果没有显著影响。 测定铜时,溶液中各反应组份的起始浓度是:在25毫升溶液中含10~(-2)M H_2SO_4 4.0毫升,1.00%磷钼酸2.0毫升及0.100M Na_2S_2O_3 1.0毫升。 我们研究了各种常见离子对该方法测定铜的影响。Na~.、K~.、NH_4~.、Ca~(..)、Mg~(..)、Zn~(..)、Mn~(..)、Co~(..)、Ni~(..)、Cd~(..)含量达1毫克/25毫升;Al~(...)、Cr~(...)、Bi~(...)含量在100微克/25毫升以下时,对测定铜没有干扰。WO_4~″、BO_3~′″含量在4×10~(-2)M时亦不致有干扰。Fe~(..)、Fe~(...)、F′、PO_4~′″、AsO_4~′″和VO_3′对铜的...

在酸性溶液中铜催化Na_2S_2O_3还原磷钼酸为钼蓝的反应,可利用以制订测定微量铜的动力学分析法。测定铜的浓度范围是:0.08—0.70微克/毫升(1.2×10~(-6)M-10×10~(-6)M),铜的浓度在此范围内与反应速度成直线关系。用该方法测定铜,个别测定的相对偏差在±10%以内。测定试样与测绘工作曲线时,室温相差在1.5℃以内,对测定结果没有显著影响。 测定铜时,溶液中各反应组份的起始浓度是:在25毫升溶液中含10~(-2)M H_2SO_4 4.0毫升,1.00%磷钼酸2.0毫升及0.100M Na_2S_2O_3 1.0毫升。 我们研究了各种常见离子对该方法测定铜的影响。Na~.、K~.、NH_4~.、Ca~(..)、Mg~(..)、Zn~(..)、Mn~(..)、Co~(..)、Ni~(..)、Cd~(..)含量达1毫克/25毫升;Al~(...)、Cr~(...)、Bi~(...)含量在100微克/25毫升以下时,对测定铜没有干扰。WO_4~″、BO_3~′″含量在4×10~(-2)M时亦不致有干扰。Fe~(..)、Fe~(...)、F′、PO_4~′″、AsO_4~′″和VO_3′对铜的测定则有显著的干扰。 VO_3′存在时显著加强铜的催化作用。当它存在时,在适当条件下当铜的含量在0.02—0.26微克/毫升(3×10~(-7)—40×10~(-7)M)时,反应速度与铜的浓度的平方成正比关系。

In this paper, a gravimetric method which uses benzoylacetone as precipitating agent for the determination of beryllium is proposed. Beryllium is precipitated as beryllium benzoylacetonate, Be(C_(10)H_9O_2)_2, in a slight basic solution containing ammonium carbonate. It is best precipitated at pH 8.8—10.5. Phosphate and fluoride ions, if present in small amount, cause no interference. Interference by Cu~(2+), Ni~(2+), Ca~(2+), Mg~(2+), Mn~(2+) and moderate quantities of Fe~(3+), Al~(3+) can be prevented...

In this paper, a gravimetric method which uses benzoylacetone as precipitating agent for the determination of beryllium is proposed. Beryllium is precipitated as beryllium benzoylacetonate, Be(C_(10)H_9O_2)_2, in a slight basic solution containing ammonium carbonate. It is best precipitated at pH 8.8—10.5. Phosphate and fluoride ions, if present in small amount, cause no interference. Interference by Cu~(2+), Ni~(2+), Ca~(2+), Mg~(2+), Mn~(2+) and moderate quantities of Fe~(3+), Al~(3+) can be prevented by the addition of disodium salt of EDTA solution. From one half to 15mg of beryllium may be determined with success.

本文提出用苯甲酰丙酮作沉淀剂以测定鈹的方法。在有碳酸铵的微碱性溶液中,鈹可定量沉淀为苯甲酰丙酮鈹。此沉淀可在110—120℃干燥后称量。少量的磷酸根及氟离子不影响测定。铜(Ⅱ)、镍(Ⅱ)、钙(Ⅱ)、镁(Ⅱ)、锰(Ⅱ)及少量铝(Ⅲ)、铁(Ⅲ)的干扰可用EDTA隐蔽而消除。

 
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