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mass spectra
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  质谱
     Mass Spectra of tricobalt clusters (μ_3-CH_3C)Co_3(CO)_7(μ-PPh_2CH_2PPh_2)and (μ_3-CH_3C)Co_3(CO)_9
     盖帽三核钴羰基簇合物(μ_3-CH_3C)Co_3(CO)_7(μ-PPh_2CH_2PPh_2)和(μ_3-CH_3C)Co_3(CO)_9的质谱研究
短句来源
     STUDY OF THE MASS SPECTRA OF CUBANE-LIKE COMPOUND (Et_4N) [MoFe_3S_4(Et_2dtc)_5]·CH_3CN
     类立方烷簇(Et_4N)[MoFe_3S_4(Et_2dtc)_5]CH_3CH的质谱
短句来源
     The composition of these compounds have been determined to be Ln (C_6H_4CH_3-3)_3 (Ln=Ce, Pr, Nd, Sm, Ho) and Gd (C_6H_4CH_3-3)_2Cl after examination through elemental analysis, infrared spectra and mass spectra.
     产物经元素分析、红外光谱分析及质谱分析等鉴定,确定其组成为(C_6H_4CH_3-3)_3Ln(Ln=Ce,Pr,Nd,Sm,Ho)和(G_6H_4CH_3-3)_2GdCl。
短句来源
     Investigation of laser desorption TOF mass spectra of C_(60) and C_(60)/C_(70)
     C_(60)和C_(60)/C_(70)的激光脱附飞行时间质谱分析
短句来源
     Fast Atom Bombardment (FAB) Mass Spectra Studies of Polynuclear Metal Cluster Complex [Co_3Fe (mp)_4 (Hmp) (Pbu_3~n)_3]
     四核钴铁簇合物Co_3Fe(mp)_4(Hmp)(PBu_3~n)_3的FAB质谱研究(Hmp=2-巯基苯酚,Pbu_3~n=三正丁基膦
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  质量谱
     Chiral Symmetry, Ward-Takahashi Identities and Mass Spectra in (2+1) Dimensional Chiral Gross-Neveu Model
     (2+1)维手征Gross-Neveu模型的Ward-Takahashi恒等式和质量谱
短句来源
     Ward-Takahashi Identities and Mass Spectra in(2+1) Dimensional SU(2) Four-fermi Model
     (2+1)维SU(2)四费米子耦合理论的Ward-Takahashi恒等式和质量谱
短句来源
     Simulation Study on the Splitting Effect of Transverse Mass Spectra in p+p Collisions at S~(1/2)=200GeV Using PYTHIA
     S~(1/2)=200GeV质子对撞中横质量谱劈裂效应的PYTHIA模拟研究(英文)
短句来源
     GLUE BAG MODEL AND MASS SPECTRA OF HADRONS
     胶袋模型与强子质量谱
短句来源
     Quark Confinement Potential and cc bb Mass Spectra
     夸克禁闭势与cc、bb体系的质量谱
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  “mass spectra”译为未确定词的双语例句
     CS_2 multiphoton ionization mass spectra induced by a XeCl laser
     XeCl激光诱导的CS_2多光子电离质谱
短句来源
     The Study of Fe(CO)_5 Multiphoton Ionization Mass Spectra
     Fe(CO)_5分子多光子电离质谱研究
短句来源
     multi-charged ions C~(2+), I~(2+) and I~(3+) appeared in the mass spectra when Ar or He was used as carrier gas.
     当利用氩作为载气时 ,除观察到H+ ,C+ ,CH+ ,CH+ 3 ,I+ ,CH3 I+ 等离子外 ,还观察到很强的C2 + ,I2 + 和I3 + 离子信号。
短句来源
     Yu et P. Li. The structure of ebeiensine has been established as 5α, 14α, 20β-jervanine (N-αH)-30-hydroxy-6-one(1) on the basis of its IR, 1H-NMR, 13C-NMR and mass spectra. The X-ray crystallography analysis of 1 has also been accomplished.
     在IR、MS、~1H-NMR和~(13)C-NMR解析的基础上,确定分子结构为5α,14α,20β-jervanine(N-αH)-3β-hydroxy-6-one(1),命名为鄂贝新(ebeiensine)。
短句来源
     The (56,0~+), (70,1~-) and (56,2~+) baryon mass Spectra are calculated in a diquark-quark model.
     本文用双夸克——夸克模型计算了(56,0~+),(70,1~-)和(56,2~+)重子质量。
短句来源
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  mass spectra
Two compounds were designed, synthesized, and characterized by 1H-nuclear magnetic resonance (1H-NMR), ultraviolet (UV)-visible, and matrix-assisted laser desorption/ionization (MALDI) mass spectra.
      
The molecular weights of the nine main components in an HPLC-DAD chromatogram were determined by the corresponding positive-and negative-ion ESI and the positive-and negative-ion APCI mass spectra information.
      
In the liquid chromatogram obtained by TIC from the negative-ion ESI-MS, the molecular weights of 23 main components were determined based on the corresponding positive-and negative-ion ESI mass spectra information.
      
Based on the mass spectra search function of GC/qMS with the aid of the discriminability of the geometrical isomer by GC/FTIR and the ability to determine the accurate mass charge ratio (m/z) by GC/oaTOFMS, 68 GC eluants were identified successfully.
      
Their structures were characterized by 1H-NMR and mass spectra.
      
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Five acylphloroglucinol derivatives named agrimol-A, -B, -C, -D, and -E have been isolated from the medicinal plant, Shian-Ho-Tsao [Agrimonia pilosa Ledeb (Rosaceae). The molecular formulae found by means of elementary analysis and mass spectra are shown as follows: agrimol-A, C_(37)H_(46)O_(12); agrimol-B, C_(37)H_(46)O_(12);agrimol-C, C_(36)H_(44)O_(12); agrimol-D, C_(35)H_(42)O_(12) and agrimol-E, C_(33)H_(38)O_(12).The structure of agrimol-C is proved to be tris-ψ-aspidinol nBnBnB (Ⅲ) with the aid...

Five acylphloroglucinol derivatives named agrimol-A, -B, -C, -D, and -E have been isolated from the medicinal plant, Shian-Ho-Tsao [Agrimonia pilosa Ledeb (Rosaceae). The molecular formulae found by means of elementary analysis and mass spectra are shown as follows: agrimol-A, C_(37)H_(46)O_(12); agrimol-B, C_(37)H_(46)O_(12);agrimol-C, C_(36)H_(44)O_(12); agrimol-D, C_(35)H_(42)O_(12) and agrimol-E, C_(33)H_(38)O_(12).The structure of agrimol-C is proved to be tris-ψ-aspidinol nBnBnB (Ⅲ) with the aid of UV, IR, NMR, MS spectral analyses, and through chemical identification of its alkali degradation products. The proposed structure of agrimol-C has been confirmed by chemical synthesis.

从仙鹤草中分得五种间苯三酚衍生物的三缩聚体,定名为仙鹤草酚A、B、C、D、E。通过紫外、红外、核磁共振谱及质谱的解析以及碱分解产物的鉴定,推定仙鹤草酚C的结构为Ⅲ,并经全合成确证。

The present paper starts from the Bethe-Salpeter equation for the bound states of a fermion and anti-fermion pair. Assuming that the interaction between the straton and anti-straton can be represented approximately by an instantaneous interaction in the center of mass system, we obtain the following main conclusions: (1) the solution of the Bethe-Salpeter equation may be carried out in ordinary three dimensional space and the numbers of components of the wave functions for the pseudo-scalar and vector mesons...

The present paper starts from the Bethe-Salpeter equation for the bound states of a fermion and anti-fermion pair. Assuming that the interaction between the straton and anti-straton can be represented approximately by an instantaneous interaction in the center of mass system, we obtain the following main conclusions: (1) the solution of the Bethe-Salpeter equation may be carried out in ordinary three dimensional space and the numbers of components of the wave functions for the pseudo-scalar and vector mesons reduce respectively from 4 and 8 to 2 and 4; (2) If the interaction is spherically symmetrical in space and its spinor structure is of the diagonal coupling type, then it is seen from the equation for the pseudo-scalar mesons that the meson mass appears as a quadratic eigen value in the equation, without leading to the negative energy excitation usually encountered in the fourdimensional equation; (3) The structure wave function obtained in the instantaneous interaction may be used to study both the mass spectra of the bound states, and the processes involving only the center of mass system.

本文从一对正反费米子结合成束缚态的Bethe-Salpeter方程(以下简称B-S方程)出发,假定正反层子间相互作用可以近似地用质心系瞬时相互作用描写,得到的主要结论如下:(1)B_S方程的求解可归结为在质心系三维空间内进行。描写赝标介子和矢量介子的波函数独立旋量分量的个数分别由4个和8个减少为2个和4个;(2)如果相互作用是空间球对称的,其旋量结构是对角耦合,从赝标介子方程中可以直接看到,束缚态质量作为本征值在方程中是以平方形式出现,同时又可避免四维方程中负激发的困难;(3)在瞬时相互作用近似下给出的结构波函数,可以用来研究束缚态的质量谱和只涉及质心系的过程。

Chuanghsinmycin is a new antibiotic produced by Actinoplanes jinanensis n.sp.,active against a number of Gram-positive and Gram-negative bacteria.Preliminaryclinical results show that it displays certain efficacy in septicemia,as well as urinaryand biliary infections.The present paper reports the total synthesis of(±)Chuanghsinmycin.Treatment of 4-bromoindolylmagnesium iodide(X)in ether with an excess ofacetyl chloride afforded the l,3-diacetyl-4-bromoindole(XI),condensation of whichwith the cuprous salt of...

Chuanghsinmycin is a new antibiotic produced by Actinoplanes jinanensis n.sp.,active against a number of Gram-positive and Gram-negative bacteria.Preliminaryclinical results show that it displays certain efficacy in septicemia,as well as urinaryand biliary infections.The present paper reports the total synthesis of(±)Chuanghsinmycin.Treatment of 4-bromoindolylmagnesium iodide(X)in ether with an excess ofacetyl chloride afforded the l,3-diacetyl-4-bromoindole(XI),condensation of whichwith the cuprous salt of ethyl mercaptoacetate in a mixture of quinoline and pyridineat 170~180℃ yielded the ethyl ester of l-acetyl-3,4-dehydrochuanghsinmycin(XIII).Reduction of the ester XIII with stannous chloride in a hot mixture of hydrochloricacid and acetic acid,followed by hydrolysis with sodium hydroxide,produced racemicChuanghsinmycin,which exhibited identical uv,nmr,and mass spectra and paperchromatographic behaviors as the natural levorotatory specimen.The antibacterialspectrum of this synthetic racemate was similar to that of the fermentation-producedstandard,the former showing 50% antibacterial activity when compared with thelatter.Hydrolysis of the ester XIII with ethanolic sodium hydroxide gave 3,4-dehydro-chuanghsinmycin.

创新霉素是由游动放线菌(Actinoplanes jinanensis n.sp.)产生的一种新抗菌素,它对部分革兰氏阳性及阴性细菌有抑制作用,初步临床结果表明它既对败血病,又对胆囊及泌尿感染具有一定的疗效,创新霉素的结构已经化学降解及光谱测定确定,本文报导了消旋创新霉素的全合成。溴化4-溴吲哚基镁(X)在乙醚中用过量乙酰氯处理得1,3-二乙酰-4-溴吲哚(XI),在喹啉-吡啶液中与巯基乙酸乙酯的亚铜盐于170~180℃缩合得1-乙酰-3,4-去氢创新霉素的乙酯(XIII),XIII与氯化亚锡在盐酸-醋酸中加热还原,经氢氧化钠水解得消旋创新霉素,它的紫外光谱、红外光谱、质谱及纸层析分析与天然的左旋创新霉素相符,合成的消旋化合物的抗菌谱与天然物相同,活性为天然物的一半。XIII用氢氧化钠的乙醇溶液水解得3,4-去氢创新霉素。

 
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