منابع مشابه
Wave propelled ratchets and drifting rafts
Several droplets, bouncing on a vertically vibrated liquid bath, can form various types of bound states, their interaction being due to the waves emitted by their bouncing. Though they associate droplets which are individually motionless, we show that these bound states are selfpropelled when the droplets are of uneven size. The driving force is linked to the assymetry of the emitted surface wa...
متن کاملAge of drifting Macrocystis pyrifera (L.) C. Agardh rafts in the Southern California Bight.
Macrocystis pyrifera plants that detach from the substratum float to the surface and, if they do not become entangled or wash immediately to the shore, may drift at the surface for an unknown period of time. These rafts provide habitat for a variety of coastal and pelagic fauna. The distances dispersed and the period available for species to utilize these habitats, however, depend on the longev...
متن کاملInteraction of a chemically propelled nanomotor with a chemical wave.
We aim to design and understand the microand nanoscale motors propelled by self-generated forces. While the ability to design motors in varied geometries with unique properties is well established, the capacity to precisely control the placement and transport of objects at this length scale is much more limited. We develop methodologies for the controlled motion of a single and an ensemble of n...
متن کاملImplementing Demons and Ratchets
Experimental results show that ratchets may be implemented in semiconductor and chemical systems, bypassing the second law and opening up huge gains in energy production. This paper summarizes or describes experiments and results on systems that effect demons and ratchets operating in chemical or electrical domains. One creates temperature differences that can be harvested by a heat engine. A s...
متن کاملBotanical ratchets.
Ratcheting surfaces are a common motif in nature and appear in plant awns and grasses. They are known to proffer selective advantages for seed dispersion and burial. In two simple model experiments, we show that these anisotropically toothed surfaces naturally serve as motion rectifiers and generically move in a unidirectional manner, when subjected to temporally and spatially symmetric excitat...
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ژورنال
عنوان ژورنال: EPL (Europhysics Letters)
سال: 2008
ISSN: 0295-5075,1286-4854
DOI: 10.1209/0295-5075/82/44001