一阶矩和二阶矩。
考虑标准二维布朗运动在正象限锥形区域的占有时，得到其一阶矩和二阶矩的表达式。
The occupation time in a cone in the positive quadrant for a standard two-dimensional Brownian motion is studied, and its first and second moments are given explicitly.
探讨了在随机向量的一阶矩和二阶矩条件下，寻找补偿函数的期望值的一个上界的问题。
This paper inquires into the problem of finding an upper bound for the expectation of recourse function when only first and second moment constraints are available.
作用在任意运动物体（系）上的力和力矩可以分别表示成流场中动力学涡量的一阶矩和二阶矩随时间的变化率。
The force and moment exerted on the solid body are expressed as the rate of change of the first-and second-order kinetic vorticity moments, respectively.
作用在任意运动物体（系）上的力和力矩可以分别表示成流场中动力学涡量的一阶矩和二阶矩随时间的变化率。
The force and moment exerted on the solid body are expressed as the rate of change of the first-and second-order kinetic vorticity moments, respectively.
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