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led
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  发光二极管
     Development of High-Brightness Red Ga_(1-x),Al_xAs/Ga_(1-y),Al_y,As LED
     高亮度红色Ga_(1-x)Al_xAs/Ga_(1-y)Al_yAs发光二极管研究
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     The influence of steady LED irradiation on the photocurrent spectra of the strained layer multiple quantum wells In_(0.15) Ga0.85 As (8nm)-GaAs (15nm) with 15 periods have been studied from 10 K to 300 K.
     在10—300K温度范围,研究了稳态发光二极管(LED)辐照对15周期的In_(0.15)Ga_(0.85)As(8nm)-CaAs(15nm)应力层多量子阱的光电流谱的影响。
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     Effect of Unfed, Dexamethasone and LED on Protein Content of Differentiated C2C12 Myoblast
     “饥饿”和/或地塞米松以及发光二极管照射对分化后C2C12蛋白含量影响的实验研究
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     Model GF9410U GaAs Light—Emitting Diode(LED)
     GF9410U~+型GaAs发光二极管
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     It is reported that the white light emitting diodes are fabricated by combining Ce3+ :YVO4 fluorescence and InGaN/GaN blue LED.
     本文报导了通过结合自行制备的掺铈钒酸钇晶体(Ce3+:YVO4)荧光粉与InGaN/GaN蓝光发光二极管(LED)结合而得的白光发光二极管(W-LED)。
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  “led”译为未确定词的双语例句
     Growth of Single-Crystal ZnO by MOCVD, p-type Doping and Room-Temperature Electroluminescence of ZnO-Based LED
     MOCVD方法生长单晶ZnO、p型掺杂及同质ZnO-LED室温电致发光研究
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     Materials Growth and Device Fabrication of GaN-based Blue LED on Silicon Substrate
     硅衬底GaN基蓝光LED材料生长及器件研制
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     Study on MOCVD Growth and Properties of III-Ⅴ Nitrides and High Brightness Blue LED Wafers
     III-Ⅴ族氮化物及其高亮度蓝光LED外延片的MOCVD生长和性质研究
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     Fabrication Techniques of Large-area Holographic Photonic Crystal Templates and Its Applications to LED
     大面积全息光子晶体模板的制作技术及其在LED中的应用
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     On the Design Method of Digital Optical Fiber Communication System with LED and Step Index Multimode Fiber
     采用LED和阶跃光纤的数字光纤通信系统的设计方法探讨
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  相似匹配句对
     LED Operation
     LED应用
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     Progress in Visible LED
     可见光LED的进展——发展趋势及蓝色LED(一)
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  led
Recent methods developed by Tao [18], Kolountzakis and Matolcsi [7] have led to counterexamples to Fugelde's Spectral Set Conjecture in both directions.
      
In search of lower dimensional nonspectral tiles we were led to investigate the Universal Spectrum Conjecture (USC) of Lagarias and Wang [14].
      
Existing vaccine delivery approaches have their limitations and these led to the development of novel approaches for vaccine delivery.
      
All the eleven derived models were further optimized using the PLS region focusing tool to increase the model resolution which led to eleven more models.
      
The removal of two outliers led to statistically significant models.
      
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The absorption band at 2240 A discovered by Stucklen in an underwater spark does not agree with the band observed by Hulthen and Zumstein in a high temperature oven and later studied by Grundstrom. The important difference lies in the complete lacking of the R-branch lines in Stucklen's band. New experimental investigation led to the discovery of the unfound R-branch lines. This is a strong evidence that the bands are actually the same.

Stcklen氏发现用铜极在水中生火花有一吸收光带位於2240A区域此光带与Hulthen氏及Zumstein氏及Grund-strom氏在高温度炉中用铜之蒸气加以氢气所得之吸收光带(亦在2240A附近)不能一致最大之分别在Stucklen之光带全无R支谱线新实验工作发现R支谱线之存在得R(0)至R(13)之十四根线确实证明Stucklen之光带并非另一新带。

The synthesis of dl-threo-3-chloro-3-phenyl-2-aminopropanol hydrochloride (Ⅳ),a usefulintermediate for the preparation of racemic chloramphenicol~[4] ,has been achieved by treating1-phenyl-2-amino-3-ethoxypropanol hydrochloride (Ⅴ),m.p.119-120°,with concentrated hydro-chloric acid in sealed tube; the ethoxy group being converted to hydroxyl,and the replacementof secondary hydroxyl by chlorine having also taken place.The compound V was in turnprepared by a 3-step synthesis starting with ethyl α-benzoyl-β-ethoxyacrylate...

The synthesis of dl-threo-3-chloro-3-phenyl-2-aminopropanol hydrochloride (Ⅳ),a usefulintermediate for the preparation of racemic chloramphenicol~[4] ,has been achieved by treating1-phenyl-2-amino-3-ethoxypropanol hydrochloride (Ⅴ),m.p.119-120°,with concentrated hydro-chloric acid in sealed tube; the ethoxy group being converted to hydroxyl,and the replacementof secondary hydroxyl by chlorine having also taken place.The compound V was in turnprepared by a 3-step synthesis starting with ethyl α-benzoyl-β-ethoxyacrylate (Ⅵ).The latterwas subjected to catalytic hydrogenation in the presence of Raney nickel with simultaneousreduction of the double bond and the carbonyl group to form ethyl α-ethoxymethyl-β-hydroxy-β-phenylpropionate (Ⅶ),b.p.145-148°/2 mm.The second step was to convert the ester byusual way to its amide (Ⅷ),m.p.128. 5-129°,from which the compound (Ⅴ),(hydro-bromide:m.p.129°,picrate:m.p.163°) was obtained by Hofmann reaction.Ikuma~[3] found that either threo-or erythro-1-phenyl-2-amino-1,3-propanediol (Ⅲ)gavethe same dl-threo (Ⅳ) on treatment with thionyl chloride,so by analogy no conclusion could bedrawn as to the configuration of the compounds Ⅴ,Ⅶ and Ⅷ,although the dl-threo-Ⅳactually resulted.The preparation of a homolog of Ⅶ,methyl α-methoxymethyl-β-hydroxy-β-phenyl-propionate (Ⅹ),b.p.146-149°/1. 5-2 mm,was also attempted.The condensation of benzal-dehyde with α-bromo-β-methoxypropionate (Ⅸ) by Reformatsky reaction led to the desired pro-duct but with extremely poor yield.The experiment,however,showed that the Reformatskyreaction is possible to take place with a compound such as Ⅸ containing a methoxy groupin the β-position of the α-bromoester.The present work also dealt with the condensation of a β-ketoamide with formaldehyde.Our experiments indicated that the reaction of benzoylacetamide or p-nitrobenzoylacetamidewith this reagent in the presence of potassium or sodium acetate led to the formation of aproduct involving the condensation of two molecules of the corresponding amide with onemolecule of formaldehyde to form αα′-dibenzoylglutaramide (ⅩⅤ),m.p.197-198°(dec.),orαα′-di-p-nitrobenzoylglutaramide (ⅩⅥ),m.p.193-194°(dec.).The structure of ⅩⅤ was con-firmed by hydrolysis to 1,3-dibenzoylpropane (ⅩⅦ),which gave no melting point depressionwith authentic sample.The condensation of ethyl p-nitrobenzoylacetate with an excess of formaldehyde gave rise toethyl αα′-dihydroxymethyl-p-nitrobenzoylacetate (ⅩⅧ),m.p.125-126°.

1. 本文叙述了从α-苯甲醯-β-乙氧基丙烯酸乙酯开始经过四个步骤合成了制备氯霉素的有用中间体--dl-threo-3-氯代-3-苯基-2-氨基丙醇盐酸盐(Ⅳ)。2. 用 Reformatsky 反应合成了α-甲氧甲基-β-羟基-β-苯基丙酸甲酯(Ⅹ),虽然产量甚小,但说明了β位置含有甲氧基的α溴酯化合物可以应用于 Reformatsky 反应,而所得的产物为相应的β羟基酸酯而非不饱和酸酯。3. 进行了β羰基醯胺与甲醛的缩合,结果所得者为二分子β羰基醯胺与一分子甲醛缩合成戊二酸醯胺衍生物,而未取得羟甲基化合物。 4. 对硝基苯甲醯乙酸乙酯与过量的甲醛进行缩合,结果获得双羟甲基化合物,αα′-双-羟甲基-对硝基苯甲醯乙酸乙酯(ⅩⅧ)。

This paper deals with the synthesis of 3-[o-dichloro (or monochloro-) acetamino-p-nitro-plenyl]-propanol (Ⅱ or Ⅱa),structurally varying from chloramphenicol on the one hand by shif-ting the dichloroacetamino group from the aliphatic side-chain to aromatic ring and replacing thesecondary hydroxyl group by hydrogen on the other,for the purpose of investigating the relationbetween biological action and chemical constitution of the antibiotic.The resulting compoundsshowed no inhibiting effect against E.coli,S.thphosa,S.paratyphi...

This paper deals with the synthesis of 3-[o-dichloro (or monochloro-) acetamino-p-nitro-plenyl]-propanol (Ⅱ or Ⅱa),structurally varying from chloramphenicol on the one hand by shif-ting the dichloroacetamino group from the aliphatic side-chain to aromatic ring and replacing thesecondary hydroxyl group by hydrogen on the other,for the purpose of investigating the relationbetween biological action and chemical constitution of the antibiotic.The resulting compoundsshowed no inhibiting effect against E.coli,S.thphosa,S.paratyphi A and B.staphylococcusaureus,and B.subtilis.The compounds Ⅱ and Ⅱa were prepared by a 4-step synthesis starting from o-nitrocin-namyl alcohol (Ⅵ),which upon hydrogenation in the presence of Raney-nickel catalyst led tothe formation of 3-(o-aminophenyl)-propanol (Ⅶ),m.p.65°.By nitrating the latter with amixture of HNO_3 and H_2SO_4,there was formed 3-(o-amino-p-nitrophenyl)-propyl hydrogen sul-phate (Ⅷ),m.p.203°(decomp.); which on subsequent hydrolysis with dilute mineral acidgave the desired product 3-(o-amino-p-nitrophenyl)-propanol (Ⅸ),m.p.90°.In order toestablish the orientation of the nitro group,this compound was converted into its N,O-diacetylderivative (Ⅹ),m.p.128°,which on oxidation with potassium permanganate gave the knowno-acetamino-p-nitrobenzoic acid (Ⅺ).Finally,the compounds Ⅱ,m.p.132°,and Ⅱa,m.p.118°,were obtained by chloroacetylation with an appropriate acid chloride.Direct hydrogenation of o-nitrocinnamaldehyde (Ⅻ) in the presence of Raney-nickel catalystgave rise to 1,2,3,4-tetrahydroquinoline (ⅩⅢ).

本文报告合成氯霉素相似化合物3-[隣二氯(或一氯)乙醯氨基-对硝基苯基]-丙醇。此等化合物对大肠杆菌,伤寒杆菌,副伤寒甲及乙杆菌,金色葡萄球菌及枯草杆菌等细菌均不现抑制作用。说明氯霉素分子上的二氯乙醯氨基从脂肪炼上移至芳香环的相邻位置上,以及仲醇羟基以氢代替后则原有的抗生作用即消失。

 
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