Based on the force constant model we calculate the phonon dispersion relations of single wall BC_3 nanotubes with different diameters and chiralities.
引用石墨经验力常数计算碳纳米管声子色散关系时 ，必须处理由二维平面卷曲形成三维实体纳米管所引入的问题 。
When he plugged that wind-force equation into his model and assumed that the probability of a branch breaking due to wind stress is constant, he came up with Leonardo's rule.
他将风力公式应用到他的模型中，并假定树枝受到风力作用而断裂的概率是恒定不变的，据此他推导出了达·芬奇公式。
One of the basic assumption of the simple catalytic model is that during the period of the diseases prevalence, the force of infection is a constant.
简单催化模型的一个基本适应条件是：在疾病流行期间其感染力保持恒定。
In Chapter 2, two moving average risk models are introduced to model the surplus process, and the probabilities of ruin are examined in models with a constant interest force.
在第二章，我们分别用二个滑动平均模型去模拟盈余过程。在常值利率的作用下我们来研究该类模型的破产概率。
In Chapter 2, two moving average risk models are introduced to model the surplus process, and the probabilities of ruin are examined in models with a constant interest force.
在第二章，我们分别用二个滑动平均模型去模拟盈余过程。在常值利率的作用下我们来研究该类模型的破产概率。
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