在线性代数中,一个的矩阵的迹(或迹数),是指的主对角线(从左上方至右下方的对角线)上各个元素的总和,一般记作或: 其中代表矩阵的第i行j列上的元素的值。一个矩阵的迹是其特征值的总和(按代数重数计算)。 迹的英文为trace,是来自德文中的Spur这个单字(与英文中的Spoor是同源词),在数学中,通常简写为“Sp”或“tr”
对自由振动圆柱后尾迹中的湍流普朗特数进行了实验研究,并与刚性柱体尾迹的结果作了比较。
Turbulent Prandtl number of wakes generated by a free vibrating cylinder were investigated experimentally, and results were compared with those of rigid cylinder wakes.
实验结果表明,在较高的雷诺数下翼型近尾迹流动是一种以旋涡的运动学和动力学特性为主导的湍流剪切流。
The experimental results indicate that the turbulent near wake flow is dominated by the dynamic and kinematic characteristics of vortices at relatively high Reynolds number.
本文获得了四元数矩阵的范数和迹的一些不等式,改进了近期的某些结果。
In this paper, we obtain some inequalities for norm and traces of quaternion matrices.
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