26.Characterizing Cycles 描述周期性 27.Modeling Cycles: MA, AR, and ARMA Models 建模周期：MA, AR, 和ARMA 模型 ..
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Cheng的模型描述了在黑洞持续吞食恒星时，热等离子体反复而周期性的被注入银河晕这样的震荡波是如何形成的。
Cheng's model describes how, as the black hole continues to devour stars, shockwaves are created as hot plasma is repeatedly and periodically injected into the halo.
该模型由描述系统振动的双曲型偏微分方程组及相应的边界条件和周期性条件组成。
This model consists the hyperbolic partial differential equations, boundary conditions and cyclical conditions of the system.
提出了一种数学模型来描述试验中沟宽的周期性形态变化。
A mathematical model was advanced to describe these changing patterns of rill width.
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