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电弧
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  arc
    Distillation of Rare-Earth Elements in Argon-Oxygen Direct Current Arc
    稀土元素在氩-氧直流电弧中的分馏
短句来源
    Effect of Some Spectroscopic Buffers on Transite Time of Cu and Cr Atoms in DC Arc Discharge
    直流电弧中若干缓冲剂对Cu及Cr原子停留时间的影响
短句来源
    RESEARCH ON HALOGENATING REACTION ARC EVAPORATION OF POWDER SAMPLE ICP-AES
    卤化反应电弧蒸发粉末法ICP-AES分析的初步研究
短句来源
    Fluorination Reaction Under Ar-O2 Controlled Atmosphere DC Arc Discharge
    氩氧控制气氛下直流电弧放电中氟化反应
短句来源
    Study on Fluoration in DC Arc Discharge in Ar-O_2 Atmosphere——Highly Effective Fluoration Reagents CuOHF and CuF_2·2H_2O
    控制气氛-直流电弧放电中氟化反应研究高效氟化剂CuOHF和CuF_2·2H_2O
短句来源
更多       
  electric arc
    Metallofullerene Gd@ C82 was synthesized via electric arc method and separated by two-step HPLC with 95% purity, and its derivative Gd@ C82 (OH)x was synthesized by the reaction of Gd@ C82 with NaOH catalyzed by tetrabutylammonium hydroxide(TBAH).
    采用电弧放电法合成和HPLC 2步分离法,得到了纯度为95%以上的Gd@C82。
短句来源
    The Way of Electric ARC AES Determining 12 Impure Elements in Metal Silicon
    电弧-AES法测定金属硅中12个杂质元素
短句来源
    ELECTRIC ARC INDUCTION COMBUSTION-ION-CHROMATOGRAPHIC DETERMINATION OF SULFUR IN IRON AND STEEL
    电弧燃烧-离子色谱法测定钢铁中硫含量
短句来源
    The C60/C70, sample was prepared by carbon electric arc method, and its crystal morphology was studied by optical microscopy, SEM and TEM.
    采用电弧法制备了C_(60)/C_(70),并用光学显微镜、扫描电子显微镜和透射电子显微镜对其结晶形貌进行了研究。
短句来源
    LaB_6ZrB_2 eutectic composites were fabricated by using electric arc furnace and EBZM(electron beam zone melting) method and yields orientated ZrB_2 fibers in a LaB_6 matrix.
    用电弧炉和电子束悬浮区熔炉法制备了LaB6ZrB2共晶复合材料,并用SEM和TEM方法对其显微组织进行了研究。
短句来源
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  ar arc
    Nano-Au Particles Prepared by H_2+Ar Arc Plasma
    氢电弧等离子体法制备纳米金粒子
短句来源
    The Desulphurization of Nano-Ti Particles Prepared by H_2+Ar Arc Plasma Method
    氢电弧等离子体法制备纳米钛粒子脱硫性能研究
短句来源
    Nano-sized composite particle was prepared by H 2+Ar arc plasma method using Pd and Ce as starting materials.
    以Pd、Ce为原料 ,用电弧等离子体法制备了纳米复合粉体。
短句来源
  “电弧”译为未确定词的双语例句
    Synthetic Process and Mechanism for Fullerene C_(60) by Way Of Arc-Synthesis
    全碳分子C_(60)电弧法合成工艺及其机理
短句来源
    A Study on Creating C60 /C70 On The Closed Electric are Chamber
    封闭电弧室制备C60/C70的研究
短句来源
    Arc-discharge Synthesis of Endohedral Metallofullerenes Er@ C_(2n)
    电弧法合成笼内含铒的金属富勒烯Er@ C_(2n)
短句来源
    Study on Excitation Source of the Flame-arc Atomic Emission Spectrometry
    火焰-电弧原子发射光谱光源研究
短句来源
    Arc-discharging Synthesis of Gd-metallofullerenes Based on GdNi_2
    GdNi_2合金电弧放电合成钆富勒
短句来源
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  arc
Let Γ be a smooth compact convex planar curve with arc length dm and let dσ=ψ dm where ψ is a cutoff function.
      
The circulant digraphDCn(S) is a directed graph with vertex setZn and arc set {(i,i+s): i ∈ Zn, s ∈ S}.
      
ThenCn(S) is arc-transitive if and only if Xoacts transitively onS.
      
A packing of the complete directed symmetric graph DKv with m-circuits, denoted by (v,m)-DCP, is defined to be a family of arc-disjoint m-circuits of DKv such that any one arc of DKv occurs in at most one m-circuit.
      
It is proved that there is no chaotic group actions on any topological space with free arc.
      
更多          
  electric arc
The mechanism of conducting-gas acceleration in an electric arc by intrinsic magnetic field was first investigated in [1].
      
The present work proposes a modified version of the difference method [4] and a series of integral methods for the calculation of the conducting-gas flow in a high-current electric arc.
      
Development of the temperature fields in an electric arc struck on a point electrode in a homogeneous gas stream
      
The development of an electric arc struck on a point cathode in a medium which moves without deformation is studied.
      
The stationary problem of a two-dimensional electric arc that develops in a medium with piecewise constant electrical conductivity is solved.
      
更多          
  ar arc
Nanoscale copper and silver were synthesized by the H2+Ar arc plasma method.
      


Various procedures for spectrographic analysis of metallurgical slags have been found inthe literature,but,in practice,results are often influenced by the chemical nature of the samples.This paper reports some results obtained on the spectrographic analysis of open-hearth slags bythe copper cup-electrode solution method.An activated a.c.arc (ПС-39) is used as light source.To the nitric acid solution ofslag samples is added stannous chloride (Sn as internal standard) and potassium bromide (Kfor the stablization...

Various procedures for spectrographic analysis of metallurgical slags have been found inthe literature,but,in practice,results are often influenced by the chemical nature of the samples.This paper reports some results obtained on the spectrographic analysis of open-hearth slags bythe copper cup-electrode solution method.An activated a.c.arc (ПС-39) is used as light source.To the nitric acid solution ofslag samples is added stannous chloride (Sn as internal standard) and potassium bromide (Kfor the stablization of the arcing).The prepared solution is then treated in a hot water-bath.The size and shape of the cup-electrode is so chosen that the height of the solution surface doesnot vary much during exposure.Because of the non-uniform distribution of the elements tobe analysed in the arc column,the slit is illuminated directly from the arc without using lenses.With fixed working curves we have obtained the lime-to-silica ratio of 20 slag samples.The differences between spectrographic and chemical values are less than ±5%.The completeanalysis of a few slag samples has been also carried out and the accuracy is found to be aboutthe same as those published in the literature.Causes for shifts of working curves in the course of experiments and means of prevention,and the problem of the dissolution of slags in nitric acid are discussed.Experiments indicatethat the turbulent effect of solution samples in the cup-electrode during arcing is advantageousand necessary.

本文叙述用杯形铜电极溶液法进行平炉渣光谱分析的一些结果。实验用ПС-39型交流电弧作光源,硝酸溶解渣样,加 SnCl_2(Sn 作内标)和 KBr(K 作燃烧稳定剂),并且把这溶液经过加热处理。再适当地选定了铜杯的大小和形状,和采用了直接照明系统。用固定定标曲线法作了20个渣样的硷度(Ca/Si)分析。与化学分析结果比较相差小于±5%。最后讨论了铜杯溶液法进行分析时定标曲线发生移动的原因和防止的方法,试样在硝酸溶液中溶解的问题,与试样溶液在燃烧过程中的翻腾现象。致谢:参加本项工作一部分的尚有周熙宁、徐升美、王桢枢等同志,谨此致谢。

Following the development of the copper cup-electrode solution method for the spectrogra-phic analysis of open-hearth slags,a series of experiments was carried out to study the volatili-zation process in such a spectral light source.The correlation of the different volatilizationcurves obtained with different experimental conditions revealed that the volatilization processmay be considered as of two stages.The first stage corresponds to the appearence of the firstpeak on the volatilization curve,where no fractional...

Following the development of the copper cup-electrode solution method for the spectrogra-phic analysis of open-hearth slags,a series of experiments was carried out to study the volatili-zation process in such a spectral light source.The correlation of the different volatilizationcurves obtained with different experimental conditions revealed that the volatilization processmay be considered as of two stages.The first stage corresponds to the appearence of the firstpeak on the volatilization curve,where no fractional distillation was observed.It means thatduring this stage,volatilization of the substances into the radiating vapor comes directly fromthe surface of the solution.The second stage corresponds to the appearance of a second peakand the shape and position of this peak is very sensitive to the slight variation of experimentalconditions,which also vary differently for various elements.This tendency toward fractionaldistillation may be directly correlated with the different electrode potentials of the elements.Thus,we regard that the volatilization of the elements,during this stage,into the arc columnis essentially from the inner electrode of the cup.Because of these characteristics of thevolatilization process cited above,substances that do not dissolve in the sample solution can alsoenter into the radiating vapor especially during the first stage from the turbulent solution.Aset of experimental data indicates that the precision of spectral analysis and the position of thecalibration curves are not obviously affected by the fact that open-hearth slags do not alwayscompletely dissolve in an acid solution.The effect of the solvent(HNO_3 and HCl)on the slope of the calibration curves and theinfluence of the anions on the density of the spectral lines of the different analyzing elementswere also briefly studied.Taking into account of the results obtained from the study of the volatilization process of sucha spectral source,we were able to eliminate shifts of the calibration curves in routine analysisof open-hearth slags.This was accomplished by strict control of the height of the surfaceof the solution inside the cup-electrode and careful workmanship of the lower inner electrode.The relative arithmetic mean error of nine independent analyses for all the elements analyzed inslags was within 4%.Preliminary experiments show that this method is also applicable tospectrographic analysis of blast-furnace slags and magnesia.

根据杯形铜电极溶液法用于平炉渣光谱分析所得的初步结果,进行了一系列有关杯形电极溶液电弧光源中燃烧过程的系统试验。在不同情形下测定了溶液中各元素的燃烧曲线,看到曲线上先后有两个高峯出现,因而认为光源中的燃烧过程有两阶段,物质在这两燃烧阶段中进入放电区的方式不同。第一阶段相当于第一高峯出现的期间,在这时并没有分馏现象,这表示溶液中的物质主要是经过溶液的翻腾作用而直接从液面进入放电区的。燃烧过程的后一阶段相当于曲线上的第二高峯的部分,这个峯的形状和位置对于不同元素和不同实验条件很灵敏,有分馏现象出现。根据对于各种分析元素的分解电压,可以认为,溶液中的物质在这个燃烧阶段主要是通过电极心而进入弧柱的。在平炉渣的实际分析中,严格地控制杯中液面的高低和铜电极心的加工规格,所得到各元素的九次独立分析误差都在4%以内。

In the present paper, a comparatively simple spectrochemical method for thedetermination of rare earth elements and thorium in their mixtures is described.The method takes the advantage of combined chemical and spectrographic proce-dure. The rare earths and thorium mixture is separated chemically from the mi-nerals. The cerium oxide content is determined volumetrically and then raised to80.0% by adding pure cerium compound, according to the method proposed byFassel. A drop of the resulting chloride solution...

In the present paper, a comparatively simple spectrochemical method for thedetermination of rare earth elements and thorium in their mixtures is described.The method takes the advantage of combined chemical and spectrographic proce-dure. The rare earths and thorium mixture is separated chemically from the mi-nerals. The cerium oxide content is determined volumetrically and then raised to80.0% by adding pure cerium compound, according to the method proposed byFassel. A drop of the resulting chloride solution is introduced to the flat top of agraphite electrode, which has been treated previously with a drop of liquid paraffin.The electrode is dried on a hot plate and excited in an activated A. C. arc. Spec-tral line pairs for the determination of La, Nd, Sm, Pr, Y, Gd, Dy, Yb and Erhave been selected in the region 3, 500--4, 500 A, while that of thorium falls inthe ultraviolet region. Cerium is used as internal standard. The root mean squaredeviations of a single determination vary from 2.9 to 8.8% for different elements.The linearity ef the working curves, obtained from a series of widely varyingstandard samples, and the results of rare earths and thorium for monazite showthat the present methed is free from line interference and systematic errors. Comparison has been made with regard to the vaporization characteristics ofthe rare earth oxides and thoria in the carbon D. C. are and their chlorides onthe surface of graphite electrode in the A. O. are. The effects of chlorides, nitra-tes and snlfates on the line intensity of the rare earths in the latter case havealso been observed.

本工作用化学处理与光谱分析的操作制订一较简单的分析法,适用于测定以铈组为主的希土混合物中个别组分的含量。根据Fassel的方法,希土元素及钍从矿石中用化学方法分离后,以容量法测定铈,再加入纯铈,提高氧化铈含量至80.0%。所得之混合氯化物溶液加到经液体石腊处理过的碳电极上,在电热板上干燥后,用活化交流电弧作激发光源在3,500—4,500A波段内摄谱,进行La,Nd,Sm,Pr,Y,Gd,Dy,Yb及Er的含量测定。钍在紫外摄谱。单次摄谱的均方误差在2.9—8.8%间。根据用含量变动范围较大的标准试料所作的工作曲线以及本法具体应用于独居石中希土及钍的混合物的分析结果,说明本法中没有元素互相干扰以及系统误差。此外,在工作中还比较希土元素粉末试料在直流碳电弧中及其氯化物溶液在碳电极表面上干燥后在交流电弧中的蒸发特性,并观察希土氯化物,硝酸盐及硫酸盐在后一光源中对谱线强度的影响。

 
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