This paper studies a cone with leaking as a pendulum and the period of its sand leaking movement and gives out the period changing rule of the variable mass pendulum.
本文以一个载满沙子的圆锥表漏斗作为单摆，研究沙子漏出过程的运动周期，从而给出此时变质量单摆的周期变化规律。
In this paper, the application of the sand cone model in supply chains was discussed and new research avenues were opened in the research of the compositeness of supply chain.
通过将沙堆模型应用于供应链，为供应链竞争力问题提出新的分析思路。
In this paper, the application of the sand cone model in supply chains is discussed and new analysis thoughts are provided in the research of the compositeness of supply chain.
通过将沙堆模型应用于供应链，为供应链竞争力问题提出新的分析思路。
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