Results 111 to 120 of about 151 (144)
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Experimental Tunneling Ratchets
Science, 1999Adiabatically rocked electron ratchets, defined by quantum confinement in semiconductor heterostructures, were experimentally studied in a regime where tunneling contributed to the particle flow. The rocking-induced electron flow reverses direction as a function of temperature.
, Linke +6 more
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Deterministic transport in ratchets
Physical Review E, 1999We present the deterministic transport properties of driven overdamped particles in a simple piecewise-linear ratchet potential. We consider the effects on the stationary current due to local spatial asymmetry, time asymmetry in the driving force, and we include the possibility of a global spatial asymmetry.
A, Sarmiento, H, Larralde
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Diffusion in discrete ratchets
Physical Review E, 1999The phenomenon of noise-induced transport in ratchet devices offers an explanation for directed motion on the molecular scale observed in many biological systems. Net transport through a series of discrete states, occurring in cyclic processes or reactions, can be related to widely investigated continuous ratchet models in the context of thermally ...
J A, Freund, L, Schimansky-Geier
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A molecular information ratchet
Nature, 2007Motor proteins and other biological machines are highly efficient at converting energy into directed motion and driving chemical systems away from thermodynamic equilibrium. But even though these biological structures have inspired the design of many molecules that mimic aspects of their behaviour, artificial nanomachine systems operate almost ...
Viviana, Serreli +3 more
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THE COGNITIVE RATCHET - THE RATCHET EFFECT AS A FUNDAMENTAL PRINCIPLE IN EVOLUTION AND COGNITION
Cybernetics and Systems, 2001Is the evolution and performance of cognition an asymmetric, directed process? The standard externalist definition of evolution as a mechanism of variation and selection cannot account for directed developments such as an increase in complexity of cognition.
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The flow of a reversible ratchet
Computer Physics Communications, 2011zbMATH Open Web Interface contents unavailable due to conflicting licenses.
J. L. Huang, H. J. Chen, H. C. Tseng
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Synchronization: The ratchet phenomenon
Chaos, Solitons & Fractals, 2009zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Time-dependent ratchetting experiments of SS304 stainless steel
International Journal of Plasticity, 2006Qianhua Kan, Guozheng Kang
exaly