速率保持不变，但速度矢量会发生变化。
The speed is not changing, but the velocity vector is changing.
麦克斯韦方程中有某些特性是恒定不变的——磁场强度、电位移场以及描述电磁场电通量的坡印廷矢量。
Maxwell's equations conserve certain properties-the magnetic field intensity, the electric displacement field and the Poynting vector that describes the electric flux of an electromagnetic field.
因此即使速率不变，也就是说速度矢量的的大小不变，但它的方向可以做旋转。
So, even if the speed is constant, that means, even if a length of the velocity vector stays the same, the velocity vector can still rotate.
新方法首先通过阵列方向矢量的泰勒级数展开获得关于分布源中心DOA的两个近似旋转不变关系。
The new method firstly obtains two approximate rotational invariance relations about distributed sources central DOA by the Taylor series expansion of array steering vector.
提出一种快速、有效的图家匹配算法，算法中采用的特征矢量具有RST不变性，可以对发生仿射变换的图象直接进行特征匹配。
The feature vector in the algorithm is RST invariant, which makes the feature matching operate directly on the image having geometry switch.
本文推出了磁化强度矢量与极化强度矢基的相对论变换关系，证明了M和P可构成两个洛伦兹不变量，从而可加深对M和P的理解。
The transformation of polarization vector and magnetization vector is derivedand thereafter two Lorentz invariants containing M and Pare proved.
作者在该文中从世界空间的四维坐标和四维波矢量出发，证明了电磁波的相位不变性。
This article, on the basis of four dimensional coordinates and four dimensional wave vectors of world space, proves the phrase constancy of electromagnetic waves.
通过矩阵运算，证明了奇异值特征矢量在图像做缩放变换时具有不变性，并将这种性质运用于图像匹配。
By matrix operation, the invariance of image singular value vector about the reducing and enlarging transformation is proved, and this character is applied to the image matching.
因为标量与坐标系无关，故两个矢量的点积称为标量不变量。
Formulae on the base vectors and the coordinate variables derivative going with fluid particle and their application;
指数滑移导引律的基本思想是在逼近过程中，保证追踪星的当前位置和终端位置之间的矢量方向不变，而逼近速度逐渐减小；
The spirit of the exponential slippage guidance method is keeping the direction from temporary position to the aiming point while decreasing the approach speed.
指数滑移导引律的基本思想是在逼近过程中，保证追踪星的当前位置和终端位置之间的矢量方向不变，而逼近速度逐渐减小；
The spirit of the exponential slippage guidance method is keeping the direction from temporary position to the aiming point while decreasing the approach speed.
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