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metallic
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  金属
     Statistic Ensemble Theory of Superconductivity in Small Metallic Grains
     金属小粒子超导电性的统计系综理论
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     Study on Metallic Ion Containing Acrylic Acid Polymer
     含金属离子丙烯酸聚合物的研究
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     Study on the Nano-polishing Metallic Material Using Lce Dish
     冰盘纳米抛光金属材料的研究
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     Study on Size Effects and Shape Effects of Thermodynamic Properties of Metallic Nanoparticles
     金属纳米微粒热力学性能的尺寸效应和形状效应研究
短句来源
     Rheological Behavior and Atomic Diffusion of Pd-based and Zr-based Bulk Metallic Glasses
     Pd基Zr基大块金属玻璃的流变及原子扩散行为研究
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  金属的
     It consists of a Ge-Ga bolometer operating at 1.0K with a throughput AW= 0.3 cw2sr and a NET= 1mk/Hz1/2 . Two metallic meshes set the windows at about 10cm-1 and 5cm-1. It is sensitive enough to be limited by quantum fluctuations of atmospheric radiation.
     它由锗—镓测辐射热计组成,工作温度在1.0K 输入量AW=0.3cm~2sr,而NET=1mk/Hz~(1/2)。 两个金属的网格建立了两个窗,频率分别为10cm~(-1)和5cm~(-1)。
短句来源
     The relative strength of inhibition was Ni~(2+)>Cd~(2+)>Cu~(2+) and was mainly dependent on the metallic ion concentration in solution.
     驯化前,3种金属的作用均表现为抑制,抑制作用的强弱顺序为Ni2+>Cd2+>Cu2+,抑制强度与金属离子在水溶液中的含量成正相关关系.
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     The dc resistivity investigated in the temperature range of 80-300 K indicates that the electronic properties of the materi- al exhibit a transition from semiconducting to metallic behavior for 0.2
     在80~300K温度范围的直流电阻率测量表明,材料的电性质在x=0.2和0.3之间展示了从半导体到金属的转变。 x=0.2样品已接近绝缘体-金属(I-M)相变的边缘,与文献中的结果相近。
     The results indicated that the poor adhesion of fluororesin coatings to metallic substrates was changed obviously by PPS,the bonding strength of single coating of blended PPS/FEP(interlayer 1)was 8.31MPa;
     结果表明 ,PPS明显改善了单纯氟树脂涂层对金属的不粘性 ,PPS/FEP共混单层涂层 (中间层 1)的结合强度可达 8 31MPa;
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     Metallic Foam:Its Preparation and Applications
     泡沫金属的制备与应用
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  “metallic”译为未确定词的双语例句
     Study on Direct Selective Laser Sintering of Ni-Based Metallic Powder and Key Technologies
     Ni基金属粉末激光直接烧结成形及关键技术研究
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     Composition Design and Properties of the Zr-Al-Ni-Cu Bulk Metallic Glasses
     Zr-Al-Ni-Cu大块非晶合金成分设计及性能研究
短句来源
     Characteristics Extraction of Metallic Corrosion Morphology for Corrosion Diagnosis
     金属腐蚀形貌特征提取用于腐蚀诊断的研究
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     Glass Forming Ability, Magnetic Properties and Microstructure of Nd-Al-Fe-Co Bulk Metallic Glasses
     Nd-Al-Fe-Co大块非晶的非晶形成能力、磁性和显微结构研究
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     Cluster Line Criterion and the Formation of Cu-Zr(Hf)-based Ternary Bulk Metallic Glasses
     团簇线判据及Cu-Zr(Hf)基三元块体非晶合金形成
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  metallic
coli) and photo-bacteria were used as samples, the antibacterial effect of stainless steel was very weak, while the percentage of bacteria dying from exposure to metallic copper for 30 min was over 90%.
      
Synthesis and photoluminescence properties of 8-hydroxyquinoline derivatives and their metallic complexes
      
This transition has intrinsic difference from the popular insulated-to-metallic transition in the magnetic framework.
      
We review the recent theoretical investigation on enhanced second-harmonic generation (SHG) in soft nonlinear optical materials based on ferrofluids, graded metallic films, and graded metal-dielectric films of anisotropic particles.
      
The half-metallic property remain in the AB and B models, while the other four surface models exhibit metallic properties.
      
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Many oxides of heavy metals when existing not in exact stoichiometric combining ratios exhibit the properties of a semi-conductor.The resistance ofsuch materials has a very large negative temperature coeffcient.Such thermallysensitive resistors,known as“thermisters”,have found wide range of appli-cations in thermometry,communication engineering,etc.In this investigationwe tried over hundred samples of metallic oxides and their mixtures fusedwith glass powder to form small compact bead on Pt lead wires.The...

Many oxides of heavy metals when existing not in exact stoichiometric combining ratios exhibit the properties of a semi-conductor.The resistance ofsuch materials has a very large negative temperature coeffcient.Such thermallysensitive resistors,known as“thermisters”,have found wide range of appli-cations in thermometry,communication engineering,etc.In this investigationwe tried over hundred samples of metallic oxides and their mixtures fusedwith glass powder to form small compact bead on Pt lead wires.The sampleswere treated by a new firing technique which is very convenient in laboratory.Some samples made from mixed oxides of Mn,Co and Ni showing a resistanceof 10~4-10~5 ohms at room temperature and 10-100 ohms at 500℃ seem.verypromising for practical purposes.

多种重金属的氧化物,经高温煅烧后,均可呈现电子性半导体的性质,其电导随温度急剧变化,故可作测量温度之用,通常称热感电阻。从电导的对数与温度的倒数的图中,可以推算半导体电导性所需的电子能位差。本文试验氧化物混入玻璃粉制成的小珠,用半导体体内电热法制成热感电阻,在常温时的电阻值为10~4—10~5欧姆,在500℃时只有10—100欧姆。半导体与铂导体线间的电性接触,经实验推知是良好的。这种制备方法,在实验室里,非常简易。经多次试验,以混合锰、钴、镍的氧化物和玻璃粉制成的电导性较大,有实用价值。

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl....

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl. But the sodium ferric fluoride thus formed is fairly soluble in water and makesthe end-point unclear,therefore the titration can not be performed accurately.This seems to be due to the fact that the following two reactions advancesimultaneously,and accordingly the formation of sodium ferric fluoride is in-complete in aque(?)us medium:3NaF+Fe(NO_3)_3→FeF_3+3N_aNO_33NaF+FeF_3→Na_3FeF_6Nevertheless,these reactions,according to the author's experiments;proceedalmost quantitatively in meda.containing at least 50% by volume of alcohol.This paper reports the xperimental results obtained in the fundamentalstudies on the various factors influencing the accuracy of the volumetry,namely,the sensitivity and the necessary amount of sodium salicylate used asindicator,the pH value,the alcoholic concentration of the titration medium,the concentration of the fluoride taken for the determination and the timewhen alcohol should be added in the course of titration.Furthermore,a rapidvolumetric process with high accuracy is proposed together with its applicationsin ordinary analyses of sodium fluoride and other fluorine compounds.The proposed method is characteristic in using sodium salicylate asindicator,which shows sharp violet color with minute amount of ferric ion inmedium of pH 3 controlled with buffer solution,then titrating with standardferric nitrate,and adding proper amount of alcohol(the alcoholic concentra-tion at the end-point should be above 50%)during the titration,when themedium becomes orange yellow in color.The method may be summarized as follows:Take 5 ml of neutral sodiumfluoride solution of about 0.3 N in a small Erlenmeyer flask,add 2.5 mlof Walpole's buffer solution of pH 3(formed by dissolving 34.0 g ofcrystalline sodium acetate and 20 ml of 38% HCl in water,and making upto 250 ml)and 1 ml of 0.1 M sodium salicylate dissolved in 50% alcohol.After sufficient stirring,titrate with standard 0.3 N(0.05 M)ferric nitratesolution,using micro-burette until the medium becomes orange yellow,thisstep being reached after addition of about 4 ml of titrant.Then decolorizethe solution by adding 12.5 ml of absolute alcohol(or 13 ml of 95% alcohol),previously purified by redistillation with lime;stirring is necessary during theaddition.Further continue the titration until the light pink color formeddoes not fade after stirring for 30 seconds when observed over a white surface. In the analyses of sodium fluoride and other fluorine compounds con-taining interfering substances,such as divalent and polyvalent metallic ions,phosphate,silicate,borate,carbonate,sulfide ions and reductants acting on ferricion,it is necessary to separate fluorine from these interfering substances bythe distillation with sulfuric acid according to the method of Willard andWinter(20).Then the distillate is neutralized with dilute sodium hydroxideand adjusted to the proper pH with hydrochloric acid using p-nitrophenol asindicator.The solution is ready for titration as described.But in the caseof absence of these interfering substances except carbonate,for example,inthe determination of the concentration of sodium fluorde solution obtained bythe extraction of the crude product,produced industrially by fusing fluorsparwith sodium carbonate and silica,the above separation of fluorine by dis-tillation is dispensable.The anaIytical results obtained by the proposed method are in goodagreement with those obtained by the lead chlorofluoride process(8),whichis recognized as official method for the determination of fluorine in agriculturalproducts.

本文介绍一容量分析氟的新方法和在工业制品上的应用,并分析了一种工业制备的氟化钠液,所得的结果和氟氯化铅法所得的极为一致。对于影响该分析法准确度的各种因素:指示剂的灵敏度和滴定时适宜的用量、溶液的 pH 值、应加的乙醇量、操作中加乙醇的次序、以及氟离子的适宜浓度,均加以研究并找出适宜的情况。本法用硝酸铁为标准液,水杨酸钠作指示剂,在 pH=3左右作滴定;当溶液呈橙黄色时,加入适量的乙醇,使其浓度在终点时仍不低于50%。如有干扰物质如二价及多价金属离子、磷酸根、矽酸根、硼酸根、碳酸根、硫化物和还原物质可能与三价铁起作用者,均应分离之。

An attempt was made by Hodgson to introduce alkyl or aryl group into aromatic ring through the reaction between aryldiazonium chloride [(Ar N_2 Cl)_2·ZnCl_2] and Grignard reagent (RMgX). Among the reaction products, however, he found Ar·Ar, Ar·H, ArN=NAr, ArN=N·R, Ar·X present in various proportions, but no Ar·R as expected. According to the result of an recent investigation of A. N. Nesmeyanov, the thermal decom- position of aryldiazonium fluoroborate afforded aryl cation, while the diazonium salt of other...

An attempt was made by Hodgson to introduce alkyl or aryl group into aromatic ring through the reaction between aryldiazonium chloride [(Ar N_2 Cl)_2·ZnCl_2] and Grignard reagent (RMgX). Among the reaction products, however, he found Ar·Ar, Ar·H, ArN=NAr, ArN=N·R, Ar·X present in various proportions, but no Ar·R as expected. According to the result of an recent investigation of A. N. Nesmeyanov, the thermal decom- position of aryldiazonium fluoroborate afforded aryl cation, while the diazonium salt of other types gave aryl radical under the same conditions. The author caused the aryl diazonium fluoroborates to react with the less reactive organo-metallic compounds, namely, ethyl mercuric chloride and diethyl mercury. In contrast to the author's expectation, no ethylaryls were found, but diaryls (Ar·Ar), aryl- chlorides (Ar·C1) and aromatic hydrocarbons (Ar·H), and diaryls, ethyl mercuric fluoroborates, aromatic hydrocarbons and free mercury were found respectively as reaction products. In each case, tar was formed in considerable amount, especially when the decomposition was carried out with diethyl mercury.

Hodgson等曾企圖利用重氮鹽的氯化鋅的複鹽與Grignard試劑反應,希望能將烴基引入芳香環;伹在反應產物中,並無所預期的芳香烴,而有不同此例的Ar·Ar,Ar·H,ArN=N·Ar,Ar·N=N·R及Ar·X。根據最近等對芳香基氟硼酸重氮鹽的研究,證明芳香基氟硼酸重氮鹽在分解時產生烴離子,而與其它重氮鹽產生烴自由基者不同。作者因此利用芳香基氟硼酸重氮鹽及較Grignard試劑的活潑性小的有機汞化合物來代替芳香基重氮鹽的氯化鋅複鹽及Grignard試劑。在反應產物中,並無乙基芳香烴存在;生成的是不同量的Ar·Ar,Ar·H,Ar·Cl等,結果與Hodgson的實驗基本上相同。

 
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