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A flashing ratchet model of a two-headed molecular motor in a two-dimensional potential is proposed to simulate the hand-over-hand motion of kinesins.Extensive Langevin simulations of the model are performed.We discuss the dependences of motion and efficiency on the model parameters,including the external force and the temperature.A good qualitative agreement with the expected behavior is observed. 相似文献
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In this paper, we present a model of the Brownian motor in a feedback controlled ratchet, in which the application of the flashing potential depends on the state of the particle to be controlled. We derive an analytical expression for the velocity induced by the feedback ratchet, which is a function of several parameters, including the ratio of the two switching temperatures and the asymmetry parameter of the potential field. The motor shows a current inversion when either parameter is varied. 相似文献
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A flashing ratchet model of a two-headed molecular motor in a two-dimensional potential is proposed to simulate the hand-over-hand motion of kinesins. Extensive Langevin simulations of the model are performed. We discuss the dependences of motion and efficiency on the model parameters, including the external force and the temperature. A good qualitative agreement with the expected behavior is observed. 相似文献
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In this paper, we present a model of the Brownian motor in a feedback controlled ratchet, in which the application of the flashing potential depends on the state of the particle to be controlled. We derive an analytical expression for the velocity induced by the feedback ratchet, which is a function of several parameters, including the ratio of the two switching temperatures and the asymmetry parameter of the potential field. The motor shows a current inversion when either parameter is varied. 相似文献
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在化学气相沉积微晶硅薄膜过程中,为了降低成本,必须提高生长速率,但薄膜的微观结构和光电性能则随之降低,原因是成膜先驱物在薄膜表面上的扩散长度降低了. 本文利用量子化学的反应动力学理论建立有关成膜先驱物SiH3和H的反应平衡方程,求解薄膜生长速率和成膜先驱物的扩散长度,并找出影响生长速率与扩散长度的微观参数,发现生长速率不仅与流向衬底的SiH3的通量密度有关,而且与H的通量密度有关;SiH3的扩散长度与衬底温度和薄膜表面的硅氢键的形态有关,当 相似文献
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