协变和逆变的区别对于张量的计算尤为重要，这往往会出现混合方差。
The distinction between covariance and contravariance is important for computations with tensors, which often have mixed variance.
重力张量梯度；正演；边界提取。
张量代数则离不开坐标系。
张量代数则离不开坐标系。
转动下之张量。多极展开。
从而可以得到不同扩散张量的适用范围。
Accordingly, the applicable range for these diffusion tensors is acquired.
这些线性比例常数将称为折算弹性张量。
The linear proportional constants here is called "equivalent elastic tensor".
电场和磁场可以用统一的电磁张量来描述。
Magnetic field and electric field is described by unified electromagnetic tensor.
这类张量叫做反对称张量或斜对称张量。
Tensors of this kind are called antimetric or skew-symmetric.
这意味着建立本构方程必须采用张量符号。
This means that constitutive equations must be framed in tensor language.
而复合介质的电介质张量的计算相当复杂。
It is rather complicated to evaluate the dielectric tensor of composite media.
提出了应力张量与位移梯度张量的对偶关系。
A dual relationship between stress tensor and displacement grads tensor is presented.
目的研究扩散张量导出量与扩散时间的关系。
Objective To investigate the relationship between diffusion time and diffusion tensor-derived parameters.
本文讨论了对称张量场共形协变方程的真空解。
Vacuum solutions of conformally covariant equation for symmetric tensor field are discussed.
这种分解可以给出高阶张量协变导数的另一种定义。
This decomposition may give another definition of high order tensor's covariant derivative.
在最一般的情况下，热导率是一个具有六个分量的张量。
In the most general case the thermal conductivity is a tensor with six components.
麦克斯韦应力张量法是计算电机电磁转矩的有效方法。
Maxwell stress method is an available one to calculate electromagnetism torque of machines.
证明了电能密度表达式是介电张量对称性的必然推论；
The expression of energy density is proved as the deduction of this symmetry.
目的：应用弥散张量磁共振成像定量分析大脑胶质瘤的特点。
Objective: To quantify the characteristic of cerebral gliomas by using diffusion-tensor MR imaging.
本文讨论了这类非互易旋光张量下的波矢面及简正模的基本形式。
This paper discussed the basic form of the wave-vector surface and normal mode of nonreciprocal gyrotropic dielectric tensor.
将结构张量与随机游走算法相结合，提出一种新的图像分割策略。
Proposes a new approach to image segmentation through combining the structure tensor with random walk algorithm.
此外，在实验中，还直接观察到了轻空穴对电导张量分量的贡献。
In addition, we directly observe the contribution of the light hole to the conductivity tensor component.
本文提出了一种新的张量子空间的学习算法：张量局部判别投影。
In this paper, a novel tensor subspace learning algorithm, tensor locality discriminant projection, is proposed.
因此，有的教材给出的惯量张量各分量的统一表达式实际上是错误的。
Therefore the unified expression for the components of a tensor of inertia in some textbooks is wrong.
对于三维晶体，其介电参数为与晶体结构以及外电场频率密切相关的张量。
Meanwile , the corresponding relationship of the crystal structure and model parameters is solved.
提出了多磁化中心锁式态工作的非均匀磁化系统中铁氧体张量磁导率的概念。
A concept of the tensor permeability in the multicenter-magnetized inhomogeneous magnetized systems in a latching state is proposed.
微分几何包含这样的概念：纤维束和流形上的微积分，特别是矢量与张量微积分。
Within differential geometry are the concepts of fiber bundles and calculus on manifolds, in particular, vector and tensor calculus.
如果说特殊目的载体就是为缓解市场的紧张量身打造的，那它还没有达到它的目的。
If the SPV was designed to calm nerves, it hasn't worked yet.
研究人员使用“扩张量”核磁共振技术，即描述组织中的水分子的扩散或者置换程度。
The researchers used 'diffusion tensor' magnetic resonance imaging (MRI), which depicts the diffusion, or displacement, of water molecules through tissue.
研究人员使用“扩张量”核磁共振技术，即描述组织中的水分子的扩散或者置换程度。
The researchers used 'diffusion tensor' magnetic resonance imaging (MRI), which depicts the diffusion, or displacement, of water molecules through tissue.
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