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1.vector quantity and tensor . If physical quantity is vector quantity it must obey the addition rule of vector quantity, that is to say, when two vector quantities is added, its result is not influenced by adding order. In other words, the result is same as the resulf of A→+B→=B→+A→ .
物理量又分为标量、矢量和张量 ,若物理量是矢量 ,它应服从矢量的加法法则 ,即两个矢量相加时 ,相加次序不影响它的结果 ,由A→ +B→ =B→+A→ 所得到的最终结果相同。收藏指正
2.Generally, the characteristic vector quantity of a constant matrix does not form the Euclid space of n - dimensional .
一般地,常数矩阵A的特征向量不构成n维欧氏空间.收藏指正
3.A vector quantity that tends to produce an acceleration of a body in the direction of its application.
力一个矢量,它可使受力物体沿力的方向产生加速度收藏指正
4.Under the vector loss function,the paper discusses the admissibility of the mean paiameter in the special model (H)EY=XβCovY=Xdiag(β_1,β_2,…,β_n)X′ the admissibility of homogeneous linear estimators in L_1={LY∶L is the k×n matrix of the element not defeated by},and nonhomogeneous linear estimators in L_2={LY+C:L is the k×n matrix of the element not defeated by,C is k links the strict row vector quantity not defeated by of element}. It gets several necessary and sufficient conditions.
向量损失函数下,讨论了模型(H)EY=XβCovY=Xd iag(1β,β2,…,βn)X′中估计均值向量时,齐次线性估计在L1={LY∶L为元素均为非负的k×n矩阵}中的容许性,及非齐次线性估计在L2={LY+C:L为元素均非负的k×n矩阵,C为k维元素均严格非负的列向量}中的容许性,并获得了相应的充要条件。收藏指正
5.This paper directly prove in the ixtegration of retarded potentials Jis an invariant quantity of relativity,by means of the concept of vector of surqaceelement.
用面元矢量的概念,直接证明推迟势积分integral Jidxdydz/R中的 dxdydz/R是一个相对论不变量。收藏指正
6.In some ways, an electron is just like such a spinning sphere of charge—an electron has a quantity of angular momentum (its “spin”) and an associated magnetism, and in an ambient magnetic field its energy depends on how its spin vector is oriented.
就某种意义而言,电子可类比于一个旋转的带电小球:它带有角动量(就是「自旋」)以及伴随而来的磁性,而它的能量是由自旋向量与外加磁场的关系来决定。收藏指正
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