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Langevin equations have been employed to describe thermally fluctuating systems, such as thermal ratchet models . Their role of the heat bath in these contexts has not been clearly understood. We introduce an approach to this issue and, by using it, propose a method to study the energetics of those models. As a example, we calculate the efficiency of energy conversion of “Feynman's ratchet”.
Ken Sekimoto (Thu,) studied this question.