引进了有效数密度的概念，对玻色-爱因斯坦凝聚（BEC）在球谐势阱中理想玻色气体的临界温度进行探讨。
The paper introduces the concept of significant density and explores the critical temperature of Bose-Einstein condense(BEC) in the ball harmony potential well in the ideal Bose gas.
3程序是球床式高温气冷堆初始临界计算的有效工具。
Therefore, the TRIPOLI - 4.3 code can accurately calculate the initial criticality of high temperature pebble - bed reactors.
行星式球磨机可以用于超细磨矿。磨机的结构尺寸一旦确定，磨球脱离筒壁的临界转速脱离点位置则不会改变。
The planetary mill can be used for the ultrafine comminution, when the mechanism size of the mill is determined, the escaping position of the critical speed of the grinding ball will not be changed.
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