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  correlation time
    The slow tumbling motion of a spin labelled SBS block copolymer was investi-gated by the saturation transfer ESR (ST-ESR). Motions pertaining to the rota-tional correlation time from 10~(-6) to 10~(-5)S were observed in the temperature rangefrom -70℃ to -20℃, and thereby the parameter T_R ascertained by ESR.
    利用饱和转移电子自旋共振、ST-ESR)方法研究自旋标记苯乙烯一丁二烯一苯乙烯嵌段共聚物(SBS)的慢速翻滚运动,在-70~-20℃的温度范围内,观察到旋转相关时间τ_o从10~(-6)到10~(-5)S的运动,并求得相应的活化能。
短句来源
    The self-diffusion coefficient and the orientation correlation time are calculated to investigate the detail behaviors of confined carbon dioxide.
    研究二氧化碳的扩散系数和取向相关时间,探讨二氧化碳分子在孔中的详细行为。
短句来源
    The contributions of dipole—dipole relaxation and Spin—rotation relaxatiot have been separated. The molecular reorientation correlation time, isotropic rotation diffusion constant and the barriers of the internal rotation of methyl have been calculated. The whole molecle motion and internal rotation motion of methyl have been discussed using, these data.
    豪斯增强因子(NO),分离了偶极一偶极驰豫机理和自旋一旋转弛豫机型的贡献,计算了分子重取向相关时间、各向同性旋转扩散常数和甲基内旋转势垒,用这些数据讨论了分子的整体运动和甲基的内旋转运动。
短句来源
    The results show that light chemical crosslinks has, to some extent, an influence on the distribution of correlation time, but no distinct effect on the potential for segmental motion.
    结果表明,轻度化学交联对相关时间分布有一定影响,对链段运动的势垒没有明显影响。
短句来源
    Furthermore, the rotational correlation time r, the heights of the upfield EPR lines were found to be linearly correlated with the solvent viscosity η.
    以及自由基旋转相关时间τ、高场峰相对高度h_r与溶剂粘度η值之间也呈线性关系.
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  correlation times
    The experimental data were interpreted in terms of the log-X2 distribution of correlation times
    研究了分子量、浓度、溶剂和分子结构对弛豫的影响,并用相关时间的log-X~2分布函数模型解释了实验数据。
短句来源
    The empirical Cole-Cole, Fuoss-KirkwOod distribution models of correlation times, the con-formational jump model proposed by Valeur et al. and the damped orientational diffusion model of polymer local main-chain motion proposed by Skolnick and Yaris were used to fit the experimental 13C-NMR spin-lattice relaxation times (T1) and nuclear Overhauser effect (NOE) data of 1,2-polybutadienes in CDCL3 solution.
    本文采用Cole-Cole,Fuoss-Kirkwood经验相关时间分布模型和构象跳跃,高聚物局部主链运动阻尼取向扩散分子模型,对1,2-聚丁二烯在溶液中的~(13)C-NMR自旋-晶格弛豫时间nT_1和核Overhauser效应(NOE)值进行了数值拟合。
短句来源
    The 13C total spin-lattice relaxation times and the NOE factors of N-butyl aniline were measured at two temperatures by means of inversion recovery pulse sequences (180-t-90T). The contributions of each relaxation mechanism were appreciated by calculation, the correlation times re of molecular random movements were deduced, and the dynamic situation of the molecules was discussed
    本文采用反转回复法(180°-τ-90°-Τ)_n脉冲序列测定了N-正丁基苯胺在两种温度下,各~(13)C核总的自旋-晶格弛豫时间T_1和NOE因子η_с值,通过计算估计了各种弛豫机理的贡献大小,并求出了分子无规则运动的相关时间τс,进一步讨论了此分子的动力学状况。
短句来源
    The carbon-13 spin-lattice relaxation times and nuclear overhauser enhancement factors (NOE) fora series of 1, 2-polybutadienes with different configurations of 1,2-units in solution of CDC13 are determined on 200 MHz pulse FT-NMR Spectrometer. Different kinds of model in interpreting the carbon-13 NMR relaxation data including the Cole-Cole, Fuoss-kirkwood distribution mobel of correlation times , the configurational jump model proposed by valeur et. al.
    本工作用200MHz脉冲付利叶变换NMR波谱仪测定了一系列1,2-链节立体构型不同的1,2-聚丁二烯样品的~(13)C自旋-晶格弛豫时间T_1和核Overhauser效应NOE值,并用Cole-Cole、Fuoss-KirKwood经验相关时间分布模型和构象跳跃、阻尼取向扩散分子模型对nT_1和NOE值进行了电子计算机拟合。
短句来源
    The rotational correlation times and diffusion coefficients of a-CH, in a series of poly (methyl methacrylates) crosslinked with DVB were calculated according to the measured T, values.
    依据实验测得的T_1值计算了一系列用DVB交联的聚甲基丙烯酸甲酯中x-甲基的转动相关时间以及扩散系数。
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  “相关时间”译为未确定词的双语例句
    We got the similar conclusion when used the denaturalization of heating, we denaturalized the protein in the range of 65°C to 85°C, via the study of ESR found when temperature increased τ_c decreased, the inner configuration of protein has loosed, copper broken away from protein center.
    用热变性得到的结论与此类似,在65℃~85℃范围内进行热变性,通过ESR的研究,发现其旋转相关时间τ_c随着温度的增加而降低,蛋白内部结构松散,铜离子脱离蛋白内部。
短句来源
    The data were fit by using Schaefer's asymmetrical logx2 distribution.
    并用Schaefer logx~2相关时间分布模型对实验数据进行了拟合。
短句来源
    Methods: 1DSEMDY, NOE difference spectroscopy in rotating frame and selective longrange DEPT techniques were used.
    采用旋转坐标系NOE差谱技术测定不受分子相关时间的影响,并且可以从高度重叠的1H-NMR谱中定量测定NOE增益。
短句来源
    This research used a new method—ESR to study the configuration of azurin, spinned the spin label 3-maleido-proxyl to the -SH- of azurin specifically, according to the change of τ_c in the spectrum of ESR to embody the alter of inner configuration of protein.
    我们采用新的方法—电子顺磁共振方法对azurin进行内部构象的探索,用自旋标记物与天青蛋白进行特异性标记,在ESR波谱上通过标记物的旋转相关时间τ_c的变化来体现蛋白内部构象的变化。
短句来源
    In the case of using guanidine HC1 denaturalize, with the increase of guanidine concentration, the τ_ c of spin label decreased, this indicate that the inner stereo-structure of protein has loosen, and the configuration has relax.
    温度降低,分子内部驰豫行为降低。 在用盐酸胍变性的情况下,随着盐酸胍浓度的增加,旋转相关时间τ_c逐渐降低,可见蛋白内部的立体结构松散,构象已经松弛。
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  correlation time
Correlation functions of gas-dynamic parameters at the pipeline boundary are studied and the corresponding characteristics (correlation time, delay time, etc.) are determined from the model for different initial and boundary conditions.
      
A share of membrane-bound spin probe was different for chloroplasts and subchloroplast fragments, as well as its rotational correlation time and apparent enthalpy and entropy activation of nitroxide rotational motion.
      
However, the rotational correlation time τ for spin-labeled Bs and its complex with Bn in solution corresponded precisely to their molecular weights.
      
It is likely the spin correlation time of the triplet states is longer than the lifetime of the complexes.
      
Basic parameters of the correlation (time, distance, relaxation time) are calculated from experimental data.
      
更多          
  correlation times
The molecular motional correlation times of two pairs of protons, H-1a/H-1b and H-2/H-3, in the bound state at T = 298 K were 11.7 and 9.46 ns respectively, while they were 27.7 and 35.2 ps in the free state.
      
Experimental D*(t1) dependences have been shown to be adequately described by the relations of the Fatkullin theory for moderate and short correlation times of spin motion in an internal random Gaussian magnetic field.
      
The correlation times of plasma fluctuations in the Z-direction are estimated, and diffusion coefficients in the Z-direction are calculated.
      
The dependence of apparent IC50 values on the rotational correlation times of 4-hydroxy-1-oxyl-2,2,6,6-tetramethylpiperidine and its derivatives in model micellar systems was analyzed.
      
The informative parameters extracted from S(f) and Φ(p)(τ) describe correlation times and characterize loss of "memory" (correlation links) in these correlation time intervals for the "spike" and "jump" irregularities.
      
更多          


The 13C total spin-lattice relaxation times and the NOE factors of N-butyl aniline were measured at two temperatures by means of inversion recovery pulse sequences (180-t-90T).The contributions of each relaxation mechanism were appreciated by calculation, the correlation times re of molecular random movements were deduced, and the dynamic situation of the molecules was discussed

本文采用反转回复法(180°-τ-90°-Τ)_n脉冲序列测定了N-正丁基苯胺在两种温度下,各~(13)C核总的自旋-晶格弛豫时间T_1和NOE因子η_с值,通过计算估计了各种弛豫机理的贡献大小,并求出了分子无规则运动的相关时间τс,进一步讨论了此分子的动力学状况。

The changes of cell membrane properties after carcinogenesis are important subjects. This paper reports the differences between the properties of HEP.A22 mouse ascites cell membrane lipids and those of the control cells. Two types of fatty acid spin labels Ⅰ(12,3) and Ⅰ(1,14) were used and the order parameters, rotational correlation times and half amplitude angle of wobbling for lipiid were determined. Arrhenius plots in range from 0℃ to 50℃ for both cells were done simultaneously. It was found that the order...

The changes of cell membrane properties after carcinogenesis are important subjects. This paper reports the differences between the properties of HEP.A22 mouse ascites cell membrane lipids and those of the control cells. Two types of fatty acid spin labels Ⅰ(12,3) and Ⅰ(1,14) were used and the order parameters, rotational correlation times and half amplitude angle of wobbling for lipiid were determined. Arrhenius plots in range from 0℃ to 50℃ for both cells were done simultaneously. It was found that the order parameters of the cancer cell membraneare larger than those of the normal cell, but the wobbling half aplitude angle of fatty acid chain of cancer cell membrane is smaller than that of the normal cell in the depth of membrane; on the contrary at the surface of the membrane, the case is just the opposite. From the Arrhenius plots it was found that the phase transition temperature of the cancer and control cell membrane lipids are 18℃ and 30℃ respectively at the surface of the membrane, but in the depth of the membrane, the phase transition point is not found in range 0°—50℃ for both cancer and normal cells.

本工作用自旋标记ESR波谱方法研究了HEP.A22鼠腹水肝癌细胞和鼠正常肝细胞膜脂的运动性。采用两种脂肪酸类自旋标记化合物I(12,3)和I(1,14)。在0°—50℃的范围内,每隔5度记录ESR谱。测量了膜脂的旋转相关时间、序参数和摆动半幅度角,并计算了旋转活化能和相转变温度。结果表明:(1) 对癌细胞,其表层膜脂的流动性比正常细胞大,但在膜的深层,则结果相反;(2) 细胞癌变后,其动力学性质亦发生明显改变。在膜表层,癌细胞膜脂的相转变温度为~18℃,正常细胞为~30℃;而在膜的深层,正常细胞的Arrhenius作图表现为一直线,没有观察到转折点;对腹水肝癌细胞,Arrhenius作图不是一条直线,但不排斥多于一个转折点的可能性。

The ~(13)CNMR relaxation of polystyrene and its block copolymers in solution has been investigated. Relaxation parameters T_1 and NOE were determined and the variation of apparent T_2 with temperature was observed from the plots of linewidths versus temperatures, a log X~2 distribution function representing the spectra of correlation time has been used to simulate the relaxation parameters at various temperatres. Experirimental results proved that there were multiple transitions in the molecular motion of polystyrene...

The ~(13)CNMR relaxation of polystyrene and its block copolymers in solution has been investigated. Relaxation parameters T_1 and NOE were determined and the variation of apparent T_2 with temperature was observed from the plots of linewidths versus temperatures, a log X~2 distribution function representing the spectra of correlation time has been used to simulate the relaxation parameters at various temperatres. Experirimental results proved that there were multiple transitions in the molecular motion of polystyrene and its block copolymers. The relaxation parameters at various temperatures were closely related to molecular structure. For CH carbon on polystyrene there were two transitions on T_1—T and H1/2—T curve, corresponding to the rotation of thephenyl group and the main chain segmental motion. There also existed the relationship that the transition temteratures of homopolymer were greater than that of the block copolymers. Therefore, ~(13)C NMR relaxation parameters can also be used in the characterization of block copolymers,

本文研究了聚苯乙烯及苯乙烯-二甲基硅氧烷嵌段共聚物在溶液中的~(13)C NMR弛豫,测定了弛豫参数T_1,NOEF;并从线宽(△H1/2)观察了表观T_2的变化。用X~2分布函数的相关时间谱对弛豫参数进行了拟合。结果证明聚苯乙烯及其共聚物均存在多重运动单元,其弛豫参数随温度的变化与分子运动及分子结构密切相关,在CH碳的T_1~T及△H1/2~T的曲线上都观察到两个转变温度,相应于苯环的转动及主链的链段运动,且转变温度有均聚物大于嵌段共聚物的关系。因此,~(13)C NMR弛豫参数还可用于嵌段共聚物的结构表征。

 
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