1)  positive semidefinite Hermite matrix
Hermite半正定矩阵
1.
, A m are positive semidefinite Hermite matrix, and they are each other exchangeable on multiplying, 0<r≤s, then tr A r 1+.
利用平均值不等式 ,得到关于矩阵迹的不等式 :如果 A1 ,A2 ,… ,Am 皆为 n阶 Hermite半正定矩阵 ,且乘法两两可交换 ,0
2)  helium
He
1.
In order to investigate the effects of helium on the excess point defects and secondary defects processes in low activation Fe-Cr-Mn(W, V) alloys during electron beam and electron-He+ ion dual beam irradiation, the in situ observation was carried out using a high voltage electron microscope connected with an ion accelerator.
采用超高压电镜与离子加速器相连结的复合辐照装置,研究了注He对低活性Fe-Cr-Mn(W,V)合金辐照产生的点缺陷及二次缺陷行为的影响。
3)  He
He
1.
Mixing and quenching of Cs(6P_J) states induced by collisions with He atoms and N_2 molecules;
Cs(6P_J)+(He,N_2)碰撞精细结构转移和猝灭
2.
Rb(5 P_J)+(He,N_2) collisional energy transfer;
Rb(5 P_J)+(He、N_2)碰撞能量转移
3.
Mixing and Quenching of Rb 5P_J States Induced by Collisions with He Atoms and N_2 Molecules;
Rb(5P_J)与He,N_2的碰撞精细结构混合和猝灭
4)  Proton
He~（++）
5)  He-NO
He-NO
1.
Influence of He isotope on the differential cross section for He-NO collision system;
He同位素对He-NO碰撞体系微分截面的影响
6)  HeⅡ
HeⅡ
参考词条
补充资料：正定矩阵

设m是n阶实系数对称矩阵， 如果对任何非零向量

x=(x_1,...x_n) 都有 xmx^t>0，就称m正定。

正定矩阵在相似变换下可化为标准型， 即单位矩阵。

说明：补充资料仅用于学习参考，请勿用于其它任何用途。