张量

This article described the principle of the DTI and its usage in diagnosis of brain tumors,providing information before the operation of the brain tumor,and in diagnosis of the callosal agenesis.

本文就扩散张量成像技术的原理、扩散张量成像对颅脑肿瘤术前计划制定，以及对颅脑肿瘤、先天性胼胝体发育不全等多种疾病诊断价值的研究进展做一综述。

While calculating tensor Green's functions, the algorithm of secondary division is adopted to solve the singular problem. The Gaussian quadrature and continued fraction is adopted to calculate the integral with Bessel function. This method not only can ensure the right calculation of tensor Green's functions but also can get high precision.

求取张量格林函数积分时，采用二次剖分算法解决计算中奇异值问题，对于含有贝塞尔函数的积分项，利用结合连分式展开的高斯求积代替常规的快速汉克尔变换方法，确保了张量格林函数的正确计算并提高了计算精度。

Experiment proved the practicability and efficiency of this algorithm. We study a class of subband coding schemes allowing perfect reconstruction for a bidimensional signal sampled on the hexagonal grid.

辨析了张量积子波变换与六边形子波变换的特性，尤其是空间取向性的差异，六边形子波变换克服了张量积子波变换在频率域上的"某些方向不确定性问题"，提供了频率域上的尖角分解准理想模式。

Secondly, we discuss the boundary value problem of two dimensional biharmonic equation in a rectangular field and its variational problem,discretize it by using dual tensor product of and the direct product and lining up of matrices, we get some special matrices which are the presupposition in exploring the fast computation, then solve the system of linear equations.

其次本文讨论了矩形域上二维双调和方程边值问题及其相应的变分问题，利用二元张量积小波分析和矩阵的直积、拉直技巧将变分问题离散化，从而使求解偏微分方程问题变为求解线性方程组的问题。一维情况两组基的张量积下得到的系数矩阵分别为块状七对角阵和稀疏矩阵。这些特殊结构为以后快速算法的研究打下一个基础。

A nonlinear eddy-viscosity turbulent flow model, which adopted third-order correlation of stress tensor and strain tensor, was modified and applied to flow computing of turbulent flow of internal combustion engine.

把采用了应力张量和应变张量的三阶相关关系的一个非线性涡粘度湍流模型进行修正后应用于内燃机缸内湍流流动计算，用此模型对几种ω形凹坑燃烧室内燃机汽缸内的流动进行计算，特别考查不同结构燃烧室内各处的湍能的变化，给出了燃烧室结构对缸内湍能影响结果，结果表明，凹坑结构时内燃机缸内湍能的分布和平均湍能的大小影响很大，可适当调整燃烧室结构来改变缸内湍流结构。

Uenced by lighting, expres-sion, view, and age, we apply tensor factorization to extracting multi-factor representationfor faces and propose a TF-based model for facial view estimation and an algorithm with themeasure of correlation between tensor representation and view factor.

考虑到人脸图像受光照、表情、视角、年龄等多种因素的影响，我们用张量分解方法同时提取人脸图像中的多因子表征，进而构建一个基于张量分解的人脸视角感知模型。

The quantities ba are the covariant components of a plane tensor, called the curvature tensor of the surface

baβ是"平面张量"的协变分量，叫做该曲面的曲率张量。

Then, the permeability tensor theory is utilized to calculate permeability tensor value of each measured chamber section in order to obtain crack medium three-dimension permeability tensor field.

针对裂隙岩体的非均质性、各向异性特点，本次毕业设计对紫坪铺水利枢纽工程地下洞室开挖后洞壁裂隙结构面进行了几何参数测量和分组，再利用渗透张量理论计算各测量洞段渗透张量值，获得裂隙介质三维渗透张量场。

This paper combines the internal variable theory and the tensor function representation theory to establish the constitutive equations of the deformation theory and the increment theory for the isotropic and rate independent materials.

在内变量理论的框架下，针对各向同性率无关材料，使用张量函数表示理论建立了塑性应变全量及增量本构关系的最一般的张量不变性表示。

Based on the theory of B spline,this paper discusses the sufficient and necessary conditions of G 1 continuity between two patches of bi cubic tensor product non uniform B spline surfaces in a special type,and gives a kind of sufficient condition of G 1 continuity so as to satisfy the need of application.

依据有关B样条理论，研究了一种特定类型的双三次张量积非均匀B样条曲面间G1光滑拼接的充要条件，且给出了此种类型的两张双三次张量积非均匀B样条曲面间G1光滑拼接的一个充分条件，以满足实际应用的需

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。