Objective To study the molecular relaxation basis of tissue contrast in magnetic resonance ( MR) image. 目的为探讨图像组织对比度的分子弛豫基础。
Increased Efficiency of Frequency Up-conversion of Double Degenerate Four-Wave Mixing by Molecular Relaxation Characteristic 利用分子弛豫特性提高二重简并四波混频频率上转换效率
Analysis of axially symmetric molecular tumbling and methyl internal rotation rates of morphine by~ ( 13) c spin-lattice relaxation time t_1 用自旋-晶格弛豫时间T1研究吗啡的不对称旋转和甲基内旋转速度
Associated with the molecular statics relaxation method, a computer modelling technique was provided for the study of structural characteristics of nanocrystals. 结合分子静力学的原子弛豫技术提出了一个对纳米晶体的原子结构模型及性质进行研究的计算机模拟方法。
Method of expression for high molecular material of strain relaxation velocity 高分子材料应变松弛速率的表示方法
Molecular relaxation mechanisms of tissue contrast in magnetic resonance image of prostates 磁共振图像组织对比度的分子弛豫基础研究
This bind energy change may be due to existence of larger molecular relaxation effect at these interfaces. Therefore, the bind energy change is not able to characterize strength of interaction along the fluoropolymer/ TATB interface. 造成这个结合能变化的原因可能是在该界面上存在着分子间弛豫效应,因此其不能用于表征氟聚物/TATB界面分子间作用大小。
It is discussed that Maxwell model can be used to describe stress relaxation tests and dynamic mechanical tests, and the molecular theory may also be used to calculate the relaxation time of polymer solutions. Maxwell模型可以很好地描述应力松弛实验和动态力学实验,也可以用分子理论对聚合物溶液的松弛时间进行计算。
The investigative results showed that the size and distribution of molecular segmental mobility in PET amorphous region could be described by the relaxation time distribution of PET α transition. 研究结果认为,可用PETα转变的松弛时间分布来描述PET非晶区分子链段运动能力的大小和分布;
The Born-Mayer potential function was employed, and the molecular dynamics method was used to model the structure relaxation process of bulk structure to surface structure. 采用Born-Mayer势函数,使用分子动力学方法,模拟了玻璃体相结构向表面结构转化的结构驰豫过程。
We have analysed the effect of the BDN dye molecular relaxation characteristic on the formation of grating, and formed the relation between the Gaussian time characteristic of input intensity and the amplitude of energy density of grating. 我们还分析了BDN染科分子的弛豫特性对光栅形成过程的影响,以及入射光强的高斯时间特性与染料中光栅能量密度振幅的时间特性之间的关系。
In addition, the effect of molecular structure, molecular movement and relaxation of polymeric matrix used on the photoresponsibility of films from above materials was discussed. 此外,还对不同高分子母体材料的分子结构,分子运动以及松弛等对所构成薄膜光控能力的影响进行了讨论。
The molecular chain fatigue failure mechanism of above curing systems was discussed from compression heat build-up, continuous chemical stress relaxation and intermittent chemical stress relaxation. Their failure characteristic parameters β and C0 were derived. 从生热、连续和间歇应力弛豫等行为上讨论了3种硫化体系共混物的疲劳断裂机理,并给出了各体系共混物疲劳断裂特征参数β和C0。
Using this rotational diffusion model, molecular volumes of alanine in different pH's were then calculated from the observed spin-lattice relaxation times and solution viscosities. 根据这个转动扩散模型,利用实验测定的自旋&晶格弛豫时间和溶液粘度计算了丙氨酸在不同pH值下的体积。
Study on the Effects and Molecular Mechanism of Beta 3-adrenoceptor Subtypes Mediated Rat Detrusor Relaxation β3-AR调节逼尿肌舒张功能的作用及信号分子机制的实验研究
Millisecond-Scale Molecular Dynamics in Aqueous Solution of Surfactant CTAB Studied by NMR Transverse Relaxation Dispersion 表面活性剂CTAB水溶液中的T2弛豫分散研究
Effect of Solvents on the Molecular Rotation Relaxation Process 溶剂对分子转动弛豫过程的影响
A relaxation process associated with the grafting molecular motion was observed at& 40 ℃ on the dynamic mechanical relaxation spectra of sample 1, while there was no such a process on the spectra of the other three samples. 在试样1的动态力学性能谱上一40℃左右有一个相应于接枝点的分子松驰过程,而另外三个试样则检测不到这一松驰过程。
For non-ionic polymer, polyisobutylene was dissolved in different organic solvents. The molecular expansion factor decreased and the Maxwell relaxation time increased with increasing solvent viscosity. 同时使用不同的有机溶剂测量聚丁烯溶液的Maxwell模型松弛时间和分子扩张因数。
Fully Anisotropic Overall Molecular Tumbling with Group Internal Rotation-~ ( 13) C Spin-Lattice Relaxation Study of Codeine 分子的完全不对称旋转和甲基内旋转可待因~(13)C核自旋晶格弛豫
Effects of anharmonicity and mass factor on molecular vibrational relaxation of diatomics in condensed state 稠密流体中双原子分子振动弛豫的非谐性及质量效应
The 3D bond fluctuation model easily introducing the basic spacial elements, such as molecular diffusion, polymer chain relaxation and intramolecular cyclization, has ability to simulate nonideal hyperbranched polymerization. 三维键涨落模型能够引入分子扩散、高分子链松弛、分子内成环等空间效应,具有模拟非理想超支化聚合反应的能力。
Through this research, we have obtained: ( 1) New isothermal-isobaric molecular dynamics algorithm was proposed and the temperature and pressure relaxation times were optimized. 在此过程中得出如下结论:(1)提出了一种同时控制温度、压力变化的分子动力学算法。
At the same time, the molecular motion and relaxation of amorphous areas were restricted, the glass transition temperature increased and the peak of a relaxation became larger. 同时,无定形区的分子运动及松弛受到限制,玻璃化温度的升高,α松弛峰变大。
This single electron oxidation reaction, molecular ionization, occurs in two steps. The first one is the vertical ionization with the formation of transient cation which are followed by the second step& structural relaxation of the transient cation, resulting in steady-state cation or ion decomposition. 分子电离通常可以认为分两步来完成,第一步是垂直电离,形成瞬态阳离子。而后发生结构松弛,产生稳态阳离子或导致离子解体。