The research results show that the stability of rock beam-pillar depends on the mechanical geometry characteristic of the system, and it has nothing to do with the external factors.
研究结果表明，岩梁-矿柱系统的稳定性取决于系统自身的力学-几何特性，与外界因素无关。
They also discuss a wide range of applications, including the use of lasers for studying dynamic behavior of mechanical components, and fractal geometry for recognizing patterns.
他们还讨论了识别模式的应用广泛，包括了激光器的研究动态行为的机械零件的使用范围，并分形几何。
Mechanical sticking can be caused by junk in the hole, wellbore geometry anomalies, cement, keyseats or a buildup of cuttings in the annulus.
机械卡钻可能由井眼内的碎屑、井眼内几何形状异常、水泥、键槽或者岩屑在环空中的积聚等引起。
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