X = u So, now we can safely use the fact that x equals u if we are keeping track of what is actually held constant, OK? 现在可以放心使用,只要时刻谨记,到底是哪个变量保持恒定?
X axis and Y axis electric moving stages are driven to track object based on its position which is calculated by improved 3 frame difference algorithm. 通过改进的三帧差分法计算运动目标的位置,控制X、Y轴电动位移台跟踪目标。
Deduced the track formulas of the jet flow velocity z component w isoline patch vortexes centers movement, and through semi-empirical method, got vortexes centers movement track x component and z component equation with time. 通过半经验半理论的方法对射流z轴方向流速分量w等值线流团涡心运动轨迹方程进行了推导,分别建立了涡心运动轨迹x分量与z分量随时间变化的表达式。
The pressure center track data indicates us that, comparing to the elderly people who have fell down and the normal elderly people, the pressure center moving range on X axis direction of the former experimental group increase evidently, the result are opposite on Y axis direction. 压力中心轨迹数据表明,实验组有跌倒史老年人相比正常老年人压力中心在X轴方向移动范围显著增加而在Y轴方向显著降低。
Using the gridded ionization chamber, the track length data for particles α, p and t in Ar and Kr are measured. These data are calculated using the stopping power data from the program Trim and other reference. 用屏栅电离室对α、t和p在Ar与Kr中到达电离密度重心的径迹长度X进行了测量,并根据Trim程序和其它文献的阻止本领数据对其进行了计算。