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nmr实验
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  nmr experiments
     2D NMR Experiments of ~(15)N-Labeled Protein GAL4(62)
     ~(15)N标记蛋白GAL4 (62)的2D NMR实验
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     A job control software package for the Bruker WP—100 NMR spectromters was established and accomplished. By use the software package each NMR experiments can be control and operation,some experiments parameters of NMR can be calculation.
     本文讨论了在BRUKER WP—100NMR谱仪上建立作业控制软件包的方法和实现过程应用该软件包可方便的对各NMR实验进行控制和操作,并能对NMR某些参数进行计算。
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     The simulation program PROPER-MT for analysis of multiple-pulse and two-dimensional FT NMR experiments using the algebra of product operators is reported.
     本文报道了利用乘积算符方法分析多脉冲及二维FT-NMR实验的模拟程序PROPER-MT.
短句来源
     Two-window method is used to modify CPMG pulse sequence,2D NMR experiments on water-saturated man-made sandstone with moderate paramagnetic impurities and shaly sandstone are measured.
     将含有顺磁物质的人造砂岩和天然泥质砂岩饱和水,利用2个窗口改进CPMG脉冲序列,进行2D NMR实验测量。
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     DESCRIPTION OF THE EVOLUTION OF DENSITY OPERATORS IN NMR EXPERIMENTS FOR THE STRONGLY COUPLED AB SPIN SYSTEMS
     强偶合AB体系NMR实验的密度算符演化描述
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  experimental nmr
     On this basis, the NMR spectra of the system has been calculated by GIAO and CSGT ab initio method. The calculated results were in good agreement with experimental NMR data on BaTiO3 crystal.
     在此基础上进行了两种规范变换方法(GIAO和CSGT)的RHF/LANL2DZ的NMR屏蔽张量计算,得到与BaTiO_3晶体NMR实验研究相符合的结果.
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     1D and 2D NMR (1H NMR, 13C NMR, DEPT, 1H-1H COSY, HSQC, HMBC) methods were used to elucidate the structure of methyl 2, 7, 7-trimethyl-5-oxo-4-(3-methoxy -4-hydroxylphenyl) -1, 4, 5, 6, 7, 8-hexahydroquinolin-3-carboxylate. The 1H and 13C chemical shifts of the compound were assigned.
     应用1H NMR,13C NMR,DEPT,1H-1H COSY,HSQC,HMBC等多种NMR实验测试分析方法,确证了一种新的六氢喹啉衍生物2,7,7-三甲基-4-(4-羟基-3-甲氧基)苯基-5-氧代-1,4,5,6,7,8-六氢喹啉-3-羧酸甲酯的结构,并对它的1H、13C信号进行了归属.
短句来源
     The following issuess were approached:(1) ~1H NMR spectra of protons on the imidazole ring of MI, IE, IP, IMP, and IPP were recorded in D_2O and CDCl_3, respectively. Their ~1H chemical shifts (8) of H_a, H_b and H_c on the imidazole ring exhibit different spectral pattern.
     (1)通过~1H NMR实验观察到了MI,IE,IP,IMP和IPP咪唑环上的H_a,H_b,H_c在D_2O和CDCl_3中~1H化学位移及其变化值随咪唑环上N~1-取代基不同呈现出规律性的变化。
短句来源
     With the application of 1D-TOCSY, extra information was obtained in addition to the results of the classic 1D and 2D experiments.
     本工作应用了1D-TOCSY技术,利用该技术选择性强的特点来补充常规的1D、2D NMR实验所提供的分子结构的信息。
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     This result agrees with the calculated value 71.48 kJ/mol of free energy of activation for the interconversion between the conformers.
     由低能量构象转化为高能量构象所需活化能为75.66kJ/mol. 这一结果与动态NMR实验计算的71.48kJ/mol活化自由能数值相符.
短句来源
     Using a series of one and two-dimensional NMR techniques, the 1H and 13C NMR spectra of oridonin and lasiokaurinal were assigned completely.
     本文采用一系列1D和2D NMR实验对冬凌草甲素(oridonin)和Lasiokaurinal的~1H(500 MHz)和~(13)C(125 MHz)的NMR信号进行了完整的归属。
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  nmr experiments
Nucleus cross-polarization technique in a rotating frame of reference is analyzed as applied to NMR experiments with sample magic-angle spinning.
      
The transitions between the superfluid and nonsuperfluid glass states can be triggered by small magnetic fields and by the change of the tipping angle of the magnetization in NMR experiments.
      
Recent NMR experiments allow us to discuss two regimes of the orientational disorder that have different NMR properties.
      
The states also have different properties in transverse NMR experiments.
      
Manyspin clusters and correlations are created faster in such an experiment than in usual MQ NMR experiments and can be used for the investigation of the many-spin dynamics of nuclear spins in solids.
      
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  experimental nmr
The experimental NMR spectra show 31Р-111,113Cd and 113Cd-31Р spin-spin couplings only for the terminal ligands.
      
An abundant set of published experimental NMR/NQR data on electric field gradients in ReBa2Cu3O7-δ high temperature conductors, where Re=Y and Tm, is used as a test for the singlet-correlated band theory.
      
An experimental NMR study of the 6Li isotope in single crystals of lithium niobate has been performed, along with a computer simulation of 6Li NMR spectra for a crystal of congruent composition, containing defects in the cation sublattice.
      
An alternative interpretation based on the multisublattice model is proposed; this model makes use only of first-order sublattice constants kj derived from independent experimental NMR data.
      
In the experimental NMR spectra of 93Nb, subspectra of different intensities have been distinguished, whose number is three in ordinary assemblies and in assemblies with paired filaments, and two in composites with ring filaments.
      
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The polycondensation of p-phenylenediamine and terephthaloyl chloride in amide solvent system has been studied. In order to obtain high molecular weight poly (1,4-phenyleneterephthalamide) (PPTA), the solvation of PPTA with the solvents and the competitive side reaction of the solvents with terephthaloyl chloride in amide-salt system were investigated.We can observed from NMR data, the proton resonance of the amide group of these model compounds shifts markedly to lower field due to the effect of solvation....

The polycondensation of p-phenylenediamine and terephthaloyl chloride in amide solvent system has been studied. In order to obtain high molecular weight poly (1,4-phenyleneterephthalamide) (PPTA), the solvation of PPTA with the solvents and the competitive side reaction of the solvents with terephthaloyl chloride in amide-salt system were investigated.We can observed from NMR data, the proton resonance of the amide group of these model compounds shifts markedly to lower field due to the effect of solvation. The magnitude of these shifts depends on the kind of solvent and the concentration of the salt used. DMAc and NMP are the solvents which react with terephthaloyl chloride comptitively in the polycondensation process.

本文研究了在酰胺-盐溶剂体系中对苯二胺与对苯二甲酰氯的缩聚反应,溶剂对缩聚反应的影响以及溶剂体系与对苯二甲酰氯的副反应。由NMR实验结果表明,聚对苯二甲酰对苯二胺分子中酰胺基团的氢质子由于溶剂化作用向低场方向位移,位移的大小与溶剂的种类及盐的浓度有关。DMAc与NMP两种溶剂体系在缩聚反应过程中皆与对苯二甲酰氟有竞争反应。在该溶剂体系中可得到适于加工成纤的高分子量聚合物。

The FID arising from the quadrupole interaction is broken into a rotational echo train under the slow rotation condition, and the number of these echoes increases when adjusting the angle between the rotational axis and the applied magnetic field towards the Magic Angle. Thus, a accurate and quick setting of the Magic Angle in MAS-NMR experiments can he easily obtained by this phenomenon. It is theoretically explained by analysing the FID of a spin-1 system. The setting accuracy within 0.05°with a per-deuterated...

The FID arising from the quadrupole interaction is broken into a rotational echo train under the slow rotation condition, and the number of these echoes increases when adjusting the angle between the rotational axis and the applied magnetic field towards the Magic Angle. Thus, a accurate and quick setting of the Magic Angle in MAS-NMR experiments can he easily obtained by this phenomenon. It is theoretically explained by analysing the FID of a spin-1 system. The setting accuracy within 0.05°with a per-deuterated HMB sample is experimentally demonstrated.

慢旋转条件下,四极相互作用产生的FID分解为一系列旋转回波。当旋转轴向与外磁场方向夹角趋近于魔角时,观测到的回波数增加。由此,可在MAS-NMR实验中准确、迅速地确定魔角。本文分析了自旋为1的核的FID解析式,理论上解释了这一现象。以氘代HMB为例的实验证明确定魔角的准确度可达到±0.05°的数量级。

31P-NMR results revealed a restriction of the phospolipid polar headgroup motion in small sonicated lecithin vesicles by the action of Tween 80 or Triton X-100. This may be related to the inetraction between phosphate residue of phospholipid and the hydrated surface active molecules through H-bond.The results also displayed that the isotropic motion of phospholipid polar headgroup in large liquid-crystalline multilayered liposomes appears after the addition of Triton X-100 to the liposome dispersion,suggesting...

31P-NMR results revealed a restriction of the phospolipid polar headgroup motion in small sonicated lecithin vesicles by the action of Tween 80 or Triton X-100. This may be related to the inetraction between phosphate residue of phospholipid and the hydrated surface active molecules through H-bond.The results also displayed that the isotropic motion of phospholipid polar headgroup in large liquid-crystalline multilayered liposomes appears after the addition of Triton X-100 to the liposome dispersion,suggesting that Triton X-100 can induce the structure change in large liquid-crystalline bilayer system. Project supported by the Science Fund of the Chinese Academy of Sciences.

(31)~P—NMR实验表明,小的超声囊受表面活性剂Tween80或TritonX—100作用后磷脂头部基团的运动受到限制,可能与磷脂的磷酸根和水化的表面活性剂分子通过氢键的相互作用有关。多层脂质体加Triton X—100后显示各向同性运动,提示表面活性剂可诱发双层结构的改变。

 
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