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原子     
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  atom
    Atom Transfer Radical Polymerization of Methyl Methacrylate and Styrene under Microwave Irradiation and Conventional Heating
    甲基丙烯酸甲酯和苯乙烯在微波辐射及常规加热作用下的原子转移自由基聚合
短句来源
    Atom Transfer Radical Emulsion Polymerization and Synthesis of New Type Block Copolymers
    原子转移自由基乳液聚合及新型嵌段共聚物的合成
短句来源
    Fast Atom Bombardment——A New Soft Ionization Technique
    新的软电离技术——快原子轰击
短句来源
    EXTRUSION OF OXYGEN ATOM FROM THE SUBSTITUTED 7-OXABICYCLO[2,2, 1]-HEPTA-2,5-DIENE SYSTEM BY ZINC-COPPER REAGENT
    应用锌-铜试剂进行7-氧杂双环[2,2,1]-庚-2,5-双烯化合物的去氧原子反应
短句来源
    Fast Atom Bombardment Mass Spectrometry
    快原子轰击质谱
短句来源
更多       
  atoms
    Matrix Isolation Infrared Spectroscopic and Quantum Chemical Calculations of the Reactions of Metal Atoms with Methanol and Acetylene Molecules
    基质隔离—红外光谱和量化计算研究金属原子与甲醇及乙炔的反应
短句来源
    Ab Initio Periodic Density Functional Studies of the Adsorptions of Atoms and Molecules on Rh(111)
    原子和分子在Rh(111)表面吸附行为的周期性密度泛函理论研究
短句来源
    Theoretical Studies on the Colbat(Ⅲ) Complexes-DNA Interactions and Some Complexes Containing Planar Tetracoordinate Carbon Atoms
    钴(Ⅲ)配合物与DNA的相互作用及一些含平面四配位碳原子化合物的理论研究
短句来源
    DISCUSSION ON THE EXCHANGE REACTIONS BETWEEN DIFFERENT HALOGEN ATOMS
    关于不同卤原子之间的交换反应
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
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更多       
  flame atomic
    Direct Determination of Wear Metals Copper and Iron in Lubricating Oils by Flame Atomic Absorption Spectrometry
    润滑油中磨损金属铁、铜的火焰原子吸收测定
短句来源
    MODEL H-3 SEMIAUTOMATIC HYDRIDE GENERATOR USED IN FLAME ATOMIC ABSORPTION SPECTROMETRY
    H-3型半自动火焰原子吸收氢化物发生器——1.结构和以空气-乙炔火焰原子化的测定性能
短句来源
    Direct Determination of Calcium in Stainless Steel by Flame Atomic Absorption Spectrometry Combined with Flow Injection Analysis
    流动注射火焰原子吸收法直接测定不锈钢中钙
短句来源
    Extraction Chromatography and Flame Atomic Absorption Spectrometric Determination of Gold in Ores
    萃取色层分离原子吸收法测定矿石中金
短句来源
    Determination of Trace Amounts of Lead in Superalloys by Flame Atomic Absorption Spectrophotometry after Separation by Solvent Extraction
    溶剂萃取分离-火焰原子吸收光度法测定耐热合金中的痕量铅
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  atomic
    The Atomic and Molecular Mechanism for Uranium Compound Reaction and the Irradiance of Microwave Excitation Sulfur
    铀化合物反应机理与微波激励硫发光的原子分子机理
短句来源
    Electrothermal Vaporization Atomic Spectrometry/Mass Spectrometry for Trace Analysis
    电热蒸发原子光谱/质谱联用技术及痕量分析
短句来源
    Parameter Characterizations of Molecular Structures and Atomic Structures for Natural Products and the QSPR/QSAR Researches
    天然产物分子结构和原子结构参数表征及其QSPR/QSAR研究
短句来源
    A NEW CALCULATION OF ATOMIC REFRACTIONS——Ⅰ.ATOMIC REFRACTIONS OF THE ELEMENTS OF SHORT PERIODS
    原子折射度的新计算——Ⅰ.短周期各元素的原子折射度
短句来源
    Determination of Trace Amounts of Mercury in Natural Waters——Flameless Atomic Absorption Method with Electrolytic Enrichment
    天然水中痕量汞的测定——电解富集无焰原子吸收法
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      atom
    Flavonoid antioxidants act as scavengers of free radicals by rapid donation of a hydrogen atom.
          
    Also, the amino acid α-C atom radial distribution indicated that, with larger peripheral groups, more back-folding of the dendrimers occurred.
          
    Based on the property that energy of most atoms is highly concentrated, an algorithm is proposed to fast reconstruct an image from atoms' parameters by limiting atom reconstruction calculating within the atom energy concentrating area.
          
    Moreover, methods for fast calculating atom energy and normalization are also put forward.
          
    Theory of Atom Optics: Feynman's Path Integral Approach
          
    更多          
      atoms
    For the S1 we exhibit concrete examples of admissible Gabor atoms which are very closely related to uncertainty minimizing states.
          
    An advantage of DNB is that it is suitable for the separation of the basic compounds containing nitrogen atoms without a capped process because the spacer containing nitrogen atoms can shield the residual silanols from DNB.
          
    The results show that Pd atoms are monolayer-dispersed on the Ni surface in these Pd/Ni catalysts.
          
    Here, for the sake of modeling the HRIRs more truthfully, we consider choosing optimal time-frequency atoms from redundant dictionary to decompose this kind of signals of HRIRs and achieve better results than all the previous models.
          
    To overcome this one of the main drawbacks in image sparse decomposition, the property of the energy distribution of atoms is studied in this paper.
          
    更多          
      flame atomic
    After filtration, the solid mass consisting of nickel complex and naphthalene was dissolved in 5 mL of dimethylformamide, and the metal was determined using a flame atomic absorption spectrometer at a wavelength of 232 nm.
          
    Iron concentrations in fruit samples were determined by using flame atomic absorption spectrometry (FAAS).
          
    The Enrichment/Separation of Fe, Co, Pb, Cd, and Cr on Ambersorb 563 Prior to Their Flame Atomic Absorption Spectrometric Determ
          
    The metal ions in the eluent were determined by flame atomic absorption spectrometer (FAAS).
          
    A microcolumn of alumina modified with sodium dodecyl sulfate (SDS) and 1-(2-pyridylazo)-2-naphthol (PAN) was prepared for the preconcentration of trace nickel from water samples for a flame atomic absorption spectrometry (FAAS) determination.
          
    更多          
      atomic
    Duality theorems, atomic decompositions, and factorization of functions are treated.
          
    We show that if(X,Σ, μ) is not purely atomic, then the unconditional basis constant of our basis is (max(p, q) -1).
          
    The main tool in our investigations consists of an adapted atomic decomposition.
          
    We provide a general method to derive Banach frames and atomic decompositions for these Banach spaces by sampling the continuous frame.
          
    We also describe natural ways of discretizing those wavelet transforms, or equivalently to obtain atomic decompositions and Banach frames for the corresponding coorbit spaces.
          
    更多          


    A new method for the synthesis of polyene acids has been described.This consists of the condensation of crotonic ester or sorbic ester with suitable alde- hydes,followed by hydrolysis.Thus a C4 or C6 side chain with conjugated double bonds can be introduced in a single step.Condensation of methyl cro- tonate with benzaldehyde and with furfural in the presence of alcohol-free sodium methoxide gives,after hydrolysis,cis-δ-phenyl-△~(αγ)-pentadienoic acid(m.p.137.5- 138°)and cis δ-2-furan-△~(αγ)-pentadienoic acid(m.p.109-111°)respectively;while...

    A new method for the synthesis of polyene acids has been described.This consists of the condensation of crotonic ester or sorbic ester with suitable alde- hydes,followed by hydrolysis.Thus a C4 or C6 side chain with conjugated double bonds can be introduced in a single step.Condensation of methyl cro- tonate with benzaldehyde and with furfural in the presence of alcohol-free sodium methoxide gives,after hydrolysis,cis-δ-phenyl-△~(αγ)-pentadienoic acid(m.p.137.5- 138°)and cis δ-2-furan-△~(αγ)-pentadienoic acid(m.p.109-111°)respectively;while condensation of methyl crotonate with anisaldehyde under the same conditions gives a mixture which has been separated into two components:cis-δ-p-methoxy- phenyl-△~(αγ)-pentadienoic acid(m.p.115-118°)and its trans-isomer(m.p.180°, to liquid crystals and 220-221°,to clear liquid).All the above cis-acids have been converted without difficulty into the corresponding trans-acids. Condensation of sorbic ester with benzaldehyde in the presence of alcohol- free potassium methoxide gives,after hydrolysis,7-phenyl-heptatrienoic acid(m. p.189-190°,to liquid crystals and 199°,to clear liquid).

    本文叙述了一种综合多烯酸的方法:将α-丁烯酸酯或α,γ-己间二烯酸酯与适当的醛缩合,再进行水解。这样,仅用一个步骤便可引进四个或六个碳原子的共轭双键的侧链。丁烯酸甲酯与苯甲醛或糠醛在去醇的甲氧基钠影响下缩合,得到顺-δ-苯基-戊间二烯酸(熔点137.5—138°)或顺-δ-2-呋喃-α,γ-戊间二烯酸(熔点109—111°);同样情形,α-丁烯酸甲酯与对-甲氧基苯甲醛缩合时得出顺-δ-对-甲氧基苯-α,γ-戊间二烯酸(熔点115—118°)及其反式的几何异构体(熔点:180°熔为液晶,220—221°熔为透明液体)。所有上述的顺式酸用汞弧光灯照射后,可全部转变为其相应的反式酸。α,γ-己间二烯酸甲酯与苯甲醛在去醇的甲氧基钾影响下缩合,水解后得到7-苯基-庚间三烯酸(熔点:189—190°熔为液晶,199°熔为透明液体)。

    In this paper a new method has been proposed for computing the potential functions of internal rotations.Applying this method,we have calculated the potential functions of several important molecules,such as 1,2-dichloroethane, 1,1,2-trichloroethane,1,1,2,2-tetrachloroethane,n-butane,2-methyl butane,2,3- dimethyl butane,etc.All the calculated results agree with the experimental data. According to our theory,the potential functions of the three types of molecules CX_2Y-CX_2Y,CXY_2-CXY_2 and CX_2Y-CXY_2 are intimately...

    In this paper a new method has been proposed for computing the potential functions of internal rotations.Applying this method,we have calculated the potential functions of several important molecules,such as 1,2-dichloroethane, 1,1,2-trichloroethane,1,1,2,2-tetrachloroethane,n-butane,2-methyl butane,2,3- dimethyl butane,etc.All the calculated results agree with the experimental data. According to our theory,the potential functions of the three types of molecules CX_2Y-CX_2Y,CXY_2-CXY_2 and CX_2Y-CXY_2 are intimately related,if the poten- tial function of the first molecule is written as V_1(φ)=A_1+Bcosφ+Ccos2φ+D_1cos3φ. Then those of the second and the third will be of the following forms: V_2(φ)=A_2+Bcosφ+Ccos2φ+D_2cos3φ V_3(φ)=A_3-Bcosφ-Ccos2φ+D_3cos3φ where D_i~'s(i=1,2,3)can be calculated from the potential barriers of CX_3-CX_3, CY_3-CY_3,CX_3-CY_3 or similar kinds of molecules,while the A_i~'s are not important for actual problems. In this paper we have also discussed the structures of hydrazine,ethyl alco- hol,hydrogen peroxide,and the meso and active forms of the CXYZ-CXYZ type of molecules.Besides,we have pointed out that the potential functions of both the meso and the active forms of the CXYZ-CXYZ type can be calculated from those of the CX_2Y-CX_2Y,CY_2Z-CY_2Z and CZ_2X-CZ_2X types.

    本文对分子内旋转问题作了以下的贡献:首先在理论上,提供了一种分子内旋转势函数的新的计算方法。这种新方法不仅理论上来得谨严,避免了以往旧方法中的一些缺点,而且比较简单,应用范围也因此比较广泛。其次,应用这种方法到一些具体问题,得到了下列结果:1.严格的得到了 Pitzer 方程,并估计了它的准确程度。2.证明了 CX_2Y-CX_2Y、CY_2X-CY_2X 和 CX_2Y-CXY_2内旋转势函数间的连系性,设第一种分子的势函数为V_1(φ)=A_1+B cosφ+C cos 2φ+D_1 cos 3φ第二和第三两种分子的势函数分别为V_2(φ)=A_2+B cosφ+C cos 2φ+D_2 cos 3φ和V_3(φ)=A_3-B cosφ-C cos 2φ+D_3 cos 3φ具体讨论了两类很重要的相关的分子:一类是 CH_2Cl—CH_2Cl、CHCl_2—CHCl_2和CHCl_2—CH_2Cl,另一类是 CH_2(CH_3)—CH_2(CH_3)、CH(CH_3)_2—CH(CH_3)_2和CH_2(CH_3)—CH(CH_3)_2。理论上得到的结果和实验全都符合。3.批判了以往一些人建议的乙醇的内旋...

    本文对分子内旋转问题作了以下的贡献:首先在理论上,提供了一种分子内旋转势函数的新的计算方法。这种新方法不仅理论上来得谨严,避免了以往旧方法中的一些缺点,而且比较简单,应用范围也因此比较广泛。其次,应用这种方法到一些具体问题,得到了下列结果:1.严格的得到了 Pitzer 方程,并估计了它的准确程度。2.证明了 CX_2Y-CX_2Y、CY_2X-CY_2X 和 CX_2Y-CXY_2内旋转势函数间的连系性,设第一种分子的势函数为V_1(φ)=A_1+B cosφ+C cos 2φ+D_1 cos 3φ第二和第三两种分子的势函数分别为V_2(φ)=A_2+B cosφ+C cos 2φ+D_2 cos 3φ和V_3(φ)=A_3-B cosφ-C cos 2φ+D_3 cos 3φ具体讨论了两类很重要的相关的分子:一类是 CH_2Cl—CH_2Cl、CHCl_2—CHCl_2和CHCl_2—CH_2Cl,另一类是 CH_2(CH_3)—CH_2(CH_3)、CH(CH_3)_2—CH(CH_3)_2和CH_2(CH_3)—CH(CH_3)_2。理论上得到的结果和实验全都符合。3.批判了以往一些人建议的乙醇的内旋转势函数经验式,从理论上提出了乙醇势函数的正确形式,并推断了乙醇的内旋转异构体。4.由内旋转势函数推得过氧化氢的结构,并推得联氨的可能结构,和实验结果相符合。并提供了一种实验方法,来判断联氨分子中的——因此也就是氨分子中的氮原子上独对电子的性格,是 s 还是 sp~3,或者接近于哪一种。 5.讨论了 CXYZ-CXYZ 内旋消式和活性式的内旋转问题,证明了它们的内旋转势函数,和 CX_2Y-CX_2Y、CY_2Z-CY_2Z 以及 CZ_2X-CZ_2X 的密切相关联。知道了后三者的势函数,前者的也就立刻可以计算。同时推测了 CXYZ-CXYZ内旋消式有两种内旋转异构体,活性式有三种,都以对位结构为最稳定。根据我们所讨论的,可以很清楚地看出:Pitzer 和 Crawford 等人所造的计算表已经不够用了。为了使得分子内旋转问题很好的向前发展,需要造一种以V_(φ)=A+B cosφ+C cos 2φ+D cos 3φ为内旋转势函数的计算表。

    4-Methyl-5-ethyl-2-thiouracil reacts with ethyl bromide in alcoholic solution in presence of sodium ethylate,forming 2-ethylmercapto-4-methyl-5-ethyl-uracil(m. p.141°),from which 2-ethylmercapto-4-methyl-5-ethyl-6-chloropyrimidine,boiling at 148-150° at 13 mm.,at 164-166° at 17 mm.,or at 180-185° at 25 mm.,is prepared according to the directions given by Johnson and Bailey.This chloro- pyrimidine reacts with sodium methylate in methyl alcohol forming 2-ethyl- mercapto-4-methyl-5-ethyl-6-methoxypyrimidine,boiling...

    4-Methyl-5-ethyl-2-thiouracil reacts with ethyl bromide in alcoholic solution in presence of sodium ethylate,forming 2-ethylmercapto-4-methyl-5-ethyl-uracil(m. p.141°),from which 2-ethylmercapto-4-methyl-5-ethyl-6-chloropyrimidine,boiling at 148-150° at 13 mm.,at 164-166° at 17 mm.,or at 180-185° at 25 mm.,is prepared according to the directions given by Johnson and Bailey.This chloro- pyrimidine reacts with sodium methylate in methyl alcohol forming 2-ethyl- mercapto-4-methyl-5-ethyl-6-methoxypyrimidine,boiling at 152-154° at 11 mm., at 156-160° at 16.5 mm.,or at 162° at 22 mm.,and with sodium ethylate in ethyl alcohol forming 2-ethylmercapto-4-methyl-5-ethyl-6-ethoxypyrimidide,boiling at 139-140° at 5 mm.or 142-145° at 7 mm. 2-Ethylmercapto-4-methyl-5-ethyl-6-methoxypyrimidine interacts with chlorine with formation of 2-ethylsulfonyl-4-methyl-5-ethyl-6-methoxypyrimidine,m.p.45- 47°,in a yield of 81% of the theory.2-Ethylmercapto-4-methyl-5-ethyl-6-ethoxy- pyrimidine interacts with chlorine with formation of 2-ethylsulfonyl-4-methyl-5- ethyl-6-ethoxypyrimidine,boiling at 202-205° at 5 mm.or at 212-215° at 10 mm.,in a yield of 91% of the theory.2-Ethyl-mercapto-4-methyl-5-ethyl-6- chloro-pyrimidine interacts with chlorine with formation of 2-ethylsulfonyl-4- methyl-5-ethyl-6-chloro-pyrimidine,m.p.74-75.5°,in a nearly quantitative yield. 2-Ethylsulfonyl-4-methyl-5-ethyl-6-chloro-pyrimidine reacts with sodium methy- late in methyl alcohol,producing 4-methyl-5-ethyl-2,6-dimethoxypyrimidine,boil- ing at 123° at 15 mm.or 113-115° at 11 mm.;while 2-ethylsulfonyl-4-methyl- 5-ethyl-6-methoxypyrimidine reacts with sodium methylate in methyl alcohol, producing the same pyrimidine-dimethyl ether,boiling at 123° at 17 mm.2- Ethylsulfonyl-4-methyl-5-ethyl-6-ethoxy-pyrimidine reacts with sodium ethylate in ethyl alcohol in an analogous manner to form 4-methyl-5-ethyl-2,6-diethoxypyri- midine,which boils at 130° at 8 mm.4-Methyl-5-ethyl-6-methoxy-uracil,m.p. 194-195°,is produced by boiling 2-ethylsulfonyl-4-methyl-5-ethyl-6-methoxypyri- midine with 10% sodium hydroxide solution.Likewise,4-methyl-5-ethyl-6-ethoxy- uracil,m.p.179-180°,is produced by boiling 2-ethylsulfonyl-4-methyl-5-ethyl- 6-ethoxypyrimidine with 10% sodium hydroxide solution.The action of alcoho- lic ammonia upon 2-ethylsulfonyl-4-methyl-5-ethyl-6-chloropyrimidine at 100—105° gives 2-ethylsulfonyl-4-methyl-5-ethyl-6-aminopyrimidine,melting at 108—109°. 4-Methyl-5-ethyl-cytosine,m.p.296-298° or m.p.294°,is formed (i) by boiling 2-ethylsulfonyl-4-methyl-5-ethyl-6-amino-pyrimidine with 6 N hydrochloric acid and (ii) by heating 4-methyl-5-ethyl-6-methoxy-uracil with alcoholic am- monia at 120-140° for 18 hours.Thus,there are two new routes for synthesiz- ing 4-methyl-5-ethyl-cytosine,starting from 2-ethylmercapto-4-methyl-5-ethyl- uracil.Although these new methods involve one or two steps more than the old method described by Johnson and Bailey,who heated 2-ethylmercapto-4-me- thyl-5-ethyl-6-chloropyrimidine with alcoholic ammonia,producing the correspond- ing mercaptoaminopyrimidine,from which the ethylmercapto-group was removed by boiling with hydrochloric acid,they appear to be unique.

    (1)2-乙硫醇基-4-甲基-5-乙基-6-氯代嘧啶和醇钠在醇溶液中反应,则生成它相应的乙硫醇-嘧啶-醚类。(2)2-乙硫醇-嘧啶类有下列结构:式中 X 为卤素或烷氧基。它很容易和氯互相作用,形成嘧啶一砜。(3)当2-乙磺醯-嘧啶类和醇钠及碱作用时,则嘧啶中的乙磺酰基在所有的情况下都相似于一个易于被烷氧基和羟基所置换的卤原子。然而氨和氯-乙磺酰-嘧啶反应时,则氯原子为氨基取代,而乙磺酰基仍然是不作用的。(4)叙述了两种新的合成4-甲基-5-乙基-6-氨基-2-氧-嘧啶的方法。

     
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