张量

It is easy to generate this new directional filterbanks by tensor product of analysis filterbanks of DFT modulated filterbanks, and easy to extend the number of directional subbands.

通过DFT调制滤波器组的分析滤波组的张量积构造出新的方向滤波器组，这种新构造的方向滤波器组构造简单，方向数目扩展容易，并且能够有效保留图像的低频信息。

Objective:Studies were carried out to detect brain tissue damage in patients with vascular cognitive impairment using conventional magnetic resonance imaging and diffusion tensor imaging histogram analysis.

目的：利用常规MRI和扩散张量成像直方图分析，明确血管性认知损害患者的脑部病变严重程度评分、DTI直方图指标与简易智能量表间的关系。

Vascular cognitive impairment ; Diffusion tensor imaging ; Histogram analysis ; Apparent diffusion coefficient ; Anisotropy index

血管性认知功能障碍；扩散张量成像；直方图分析；表观弥散系数；各项异性指数

Features of each face image are extracted by using the wavelet transformation and the tensor principal component analysis algorithm. Weights of the features' elements are then determined using PSO according to the right clustering rate of each element, so that the object to extract the key features of the faces can be realized.

采用小波变换和张量主成分分析方法对人脸图像进行特征提取，利用PSO对提取的特征进行加权处理，根据特征的每一维元素的聚类正确率进行优化选择，从而达到对人脸提取关键性特征的目的。

Vascular cognitive impairment Diffusion tensor imaging Histogram analysis Apparent diffusion coefficient Fractional anisotropy

血管性认知功能障碍；扩散张量成像；直方图分析；表观扩散系数；各项异性分数

Railway ; cars ; vibration/railway cars in series ; vibration analysis ; inertia tensor ; vibratory differential equation

铁道；车辆；振动/铁道车辆联挂；振动分析；惯量张量；振动微分方程

The relevent concepts of tensor analysis into the study of computer aided tolerancing are introduced,and the general method for seeking the sencitivity coefficients of the mechanical problems with explicit constrains is derived.

把张量相关概念引入计算机辅助公差设计的研究中，导出显含约束、具有普遍意义的敏度系数求取方法。

High order symplectic schemes of three-dimensional time-domain Maxwell's equations are constructed with symplectic integrator technique combined with high order staggered difference. The method is used to analyzing stability and numerical dispersion of high order time-domain methods and symplectic schemes with matrix analysis and tensor product.

利用辛积分技术与高阶交错差分技术，建立求解三维时域Maxwell方程的高阶辛算法；结合电磁场中的物理概念，借助矩阵分析和张量分析理论，获得高阶时域方法及高阶辛算法的稳定性和数值色散性的统一处理新方法。

PARTⅢMagnetic resonance imaging and diffusion tensor imaging of gray matter damage in multiple sclerosis Objective To study the Magnetic resonance imagingcharacteristics of the gray matter lesions in multiple sclerosis,and to investigate the occult damage in normal appearing gray matterby quantitative analysis using diffusion tensor imaging.

第三部分多发性硬化脑灰质损害的MRI表现及DTI定量研究目的：分析多发性硬化患者脑灰质病灶的磁共振成像特征，利用弥散张量成像定量研究MS的正常表现脑灰质是否存在隐匿性损伤。

In the numerical study, the governing equations of flow and heat transfer in 3 —D body—fitted curvilinear coordinate system being automaticly generated with TTM method were deduced by means of vector and tensor analysis. These equations were dliscreted with nonstaggered grids providing relative elimilating method for the pressure oscillation was domonstrated.

在数值分析中，借助于矢量理论和张量分析，导出了具有普遍意义的三维任意曲线坐标系下的流动传热控制方程，并利于TTM方法生成了计算域的贴体曲线坐标网格；在数值离散过程中，尝试了用非交错网格离散的方法并解决了压力场振荡的抑制问题；运用附面层理论，阐述了壁面函数法在三维任意曲线坐标系上的应用。

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。