查询词典 relaxation parameter

The authors investigated the singular limits of stiff relaxation and dominant diffusion for general 2×2nonlinear systems of balance laws, that is,τ=o,ε→ 0, the relaxation time τtends to zero faster than the diffusion parameter ε. If there exists a priori L∞ bound that is uniformly with respect to ε for the solutionsof a system, then the solution sequence converges to the corresponding equilibrium solution of the system.

研究一般扩散占优的2×2双曲平衡律系统奇异松弛极限，用补偿紧性方法，在松弛时间τ比扩散系数ε趋于零快时，即τ=o，ε→ 0时，得到其解的整体存在性一般框架：如果上述系统的解存在对ε一致的先验L∞估计，则其解序列收敛于上述系统的对应平衡状态解。

Drift electron mobility, the Hall factor and Hall mobility in GaN are calculated according to Mattiessen's rule as a function of temperature for carrier concentrations with the compensation ration as a parameter on the basis of taking into account the individual average scattering momentum relaxation time of four scattering mechanisms, namely, ionized impurity scattering, polar mode optical scattering, acoustic piezoelectric scattering and acoustic phonon deformation potential scattering which have an effect on electron mobility of GaN.

考虑了对纤锌矿型氮化镓低场电子输运影响最为显著的4种散射机制－电离杂质散射，极化光学波散射，声学波压电散射和声学声子形变势散射的单个平均动量驰豫时间，采用Mattiessen's rule计算了不同补偿率以及不同载流子浓度条件下，氮化镓电子漂移迁移率，霍耳因子以及霍耳迁移率随温度的变化。

We bring in size parameter into relaxation time of free electron on basis of Drude model, and build a metal particle n and k model which vary with size and wavelength.

在德鲁特模型的介电函数基础上，对自由电子弛豫时间引入尺度修正，建立了金属粒子n、k值随波长和粒径变化的尺度效应模型。

Objective:Research Experimental animal Brachial plexus Nerve stress relaxation mechanics characteristic,For clinical provides the stress relaxation mechanics characteristic parameter.

目的：研究实验动物臂丛神经的应力松弛力学特性，为临床提供应力松弛力学特性参数。

We analyzed the main factors that influence on the quality of reconstruction image. These factors are filter function, projection data, sampling space and noise level in filter backprojection, and the choice of relaxation parameter, the fashion of data access, the choice of basis function and the estimate of optimum iterative times in algebra iterative algorithm.

详细分析了影响滤波反投影算法图像重建质量的基本因素(滤波函数的选取，投影数，抽样间距，噪音的大小)和代数重建算法图像重建质量的几个因素(松弛引子的选择，数据访问方式，基函数的选择，最优迭代次数的估计)。

Gabor-ring is often used in texture feature extraction, but it is based on the assumption that texture is narrowband signal and can not applied to most actual textured images that have more than one center frequency in power spectrum. To overcome the limitation of existing method, an improved method is proposed. According to this method, Gabor filters are constructed in accordance with the spectrum feature vector of texture, and a relaxation parameter is used to determine the effect of difference filters so as to integrate the frequencies and phases into the process of extraction.

Gabor环（即在频率域成环形分布的Gabor滤波器组）常被用于提取图像纹理特征，但它是以"纹理是窄带信号"为基础的，实际的纹理图像并不能很好地满足"窄带信号"的假设，用一个中心频率来描述一种纹理对能量集中在多个频率点的纹理图像往往不能取得理想的效果，而根据频谱特征值向量构造Gabor环的改进方法，通过松弛因子的加入改变不同滤波器的作用强度，综合考虑了多频率多相位对纹理特征提取的影响。

For an objective comparison, the iteration numbers of these methods are: MLEM with 32iterations, OSEM with 4-subset 8 iterations and 2, 4, 8, 16, 20, 40-subset and 20 iterations, RAMLA with 4-subset and 8 iteration and relaxation parameter 0.5 and 1.5, respectively.

本研究取Inveon microPET扫描小鼠的正弦图，以MLEM、OSEM及RAMLA重建，MLEM叠代次数为32次；OSEM序列子集阶层为2、4、8、20、40，叠代次数为8、20次；RAMLA因定松弛系数为0.5、1、1.5，序列子集阶层4，叠代次数为8次。

The structural relaxation parameters of PES-C are obtained by curvefitting of experimental datas according to KWW equation and NMphenomenal model. These parameters are limiting enthalpy relaxation 〓,non-exponentiality parameter β, characteristic relaxation time log 〓,non-linearity parameter x, and so on. It is found that the structural behaviorhas a strong dependence of the change of molecular weight for differentmolecular weight PES-C samples.

我们用分子链段的运动性随分子量的变化对此作了解释，同普通柔性链高聚物相比， PES-C的分子链的中间部分所受的限制更为强烈，相对只有链端部分可以相对自由运动。

After studying the results of the SOR method, we obtain the interval of the relaxation parameter in which subproper SOR iteration matrix has no complex eigenvalues and the C-SOR method converge.

在此区间内， SOR 迭代矩阵无复特征值，并且 C-SOR 方法收敛。

Methods Twenty-six NZW rabbits were randomly divided into three groups: a normal control group (fed on normal commercial rabbit diet, n =6), a hyperlipidemic group fed on high-fat ma total cholesterol (TC concentration at the beginning and the 12-week end point of the experiment determined,and all the experimental rabbits were sacrificed, and endothelial function test were performed on thoracic aortic rings prepared from the isolated aorta using the vascular endothelium-dependent relaxation parameter in response to acetylcholine The aortic atherosclerotic lesion expression of LOX-1 mRNA and protein were examined by RTPCR and Western blotting respectively.

方法新西兰大白兔随机分为正常对照组(普通饮食，6只)，高脂饮食组(高脂饮食，10只)及普罗布考组(高脂饮食+普罗布考200mg/kg·d，10只)。实验开始前及第12周分别耳缘静脉采血测定血清总胆固醇。第12周处死动物，取胸主动脉，制备离体胸主动脉环对乙酰胆碱的反应以检查内皮功能，RT-PCR与免疫印迹检测凝集素样氧化低密度脂蛋白受体-1(LOX-1)基因与蛋白质表达水平。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。