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arXiv 0903.1836nlin.CD
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具有两个非线性项的弹跳球模型:费米加速的原型

A bouncing ball model with two nonlinearities: a prototype for Fermi acceleration

Edson D. Leonel, Mario Roberto Silva

摘要:

本文研究了在两个非线性项所描述的外力作用下弹跳球模型的动力学性质。该模型的描述是通过使用一个二维非线性保测度映射的变量的粒子的速度和时间。我们发现,提高直线的控制参数,控制的非线性之一,正的李雅普诺夫指数减少的平均值,并遭受突变。我们还表明,对于一个特定的控制参数范围内,该模型表现出费米加速现象。这两种行为的解释是根据外力的形状和由于移动壁速度的不连续性给出的。

英文摘要:

Some dynamical properties of a bouncing ball model under the presence of an external force modeled by two nonlinear terms are studied. The description of the model is made by use of a two dimensional nonlinear measure preserving map on the variables velocity of the particle and time. We show that raising the straight of a control parameter which controls one of the nonlinearities, the positive Lyapunov exponent decreases in the average and suffers abrupt changes. We also show that for a specific range of control parameters, the model exhibits the phenomenon of Fermi acceleration. The explanation of both behaviours is given in terms of the shape of the external force and due to a discontinuity of the moving wall's velocity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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