منابع مشابه
Segregation by friction
– Granular materials are known to separate by size under a variety of circumstances. Experiments presented here and elucidated by modeling and MD simulation document a new segregation mechanism, namely segregation by friction. The experiments are carried out by placing steel spheres on a horizontal plane enclosed by rectangular sidewalls, and subjecting them to horizontal shaking. Half the sphe...
متن کاملInfluence of friction on granular segregation.
Vertical shaking of a mixture of small and large beads can lead to segregation where the large beads either accumulate at the top of the sample, the so-called Brazil nut effect (BNE), or at the bottom, the reverse Brazil nut effect (RBNE). Here we demonstrate experimentally a sharp transition from the RBNE to the BNE when the particle coefficient of friction increases due to aging of the partic...
متن کاملAtomic-scale friction control by vibration using friction force microscope
Manipulation of friction at the nanoscale has been traditionally approached by chemical means (lubrication). Recent friction force microscopy (FFM) experiments demonstrated that it can be done mechanically by applying vibration to accessible elements of the system. This paper provides analytic understanding on why vibration can reduce friction based on a 1D model imitating the FFM tip moving on...
متن کاملSegregation by onset asynchrony.
We describe a simple psychophysical paradigm for studying figure-ground segregation by onset asynchrony. Two pseudorandom arrays of Gabor patches are displayed, to left and right of fixation. Within one array, a subset of elements form a figure, such as a randomly curving path, that can only be reliably detected when their onset is not synchronized with that of the background elements. Several ...
متن کاملSegregation by entropy
Automatic cell topology Segregation by entropy E ntropy may be suffi cient to drive bacterial chromosome segregation, say Suckjoon Jun and Bela Mulder (FOM Institute for Atomic and Molecular Physics, Amsterdam, Netherlands). The rapid and abrupt nature of chromosome segregation in bacteria has led researchers to suspect eukaryotic-like mechanisms based on active cytoskeletal proteins. Jun appro...
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ژورنال
عنوان ژورنال: Europhysics Letters (EPL)
سال: 2003
ISSN: 0295-5075,1286-4854
DOI: 10.1209/epl/i2003-00291-y