The mesoscopic collective motion of self-propelling active particle suspension confined in two-dimensional micro-channel

The emergence of collective strategies in a prey-predator system is studied. We use the term “collective” in the sense of the collective motion of defense or attack often found in behaviors of animal grotips. In our prey-predator system, both prey and predators move around on a two-dimensional plane, interacting by playing a game; predators can score by touching the backside of a prey. Thresholds are assumed for the scores of both prey and predators. The species with the higher scores can reproduce more, and that with the lower scores will be diminished. As a result, strategies as collective motions are observed; these consist of rotating cluster motions, line formations, disordered but one-way marching, and random swarming. In particular, the strategy of random swarming encourages symbiosis in the sense that it is associated with a low extinction probability for the whole system.

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Anisotropic behavior of electrical conductivity and collective motion of charge density wave in quasi-two-dimensional conductor η-Mo4O11

Physica B Condensed Matter ◽

10.1016/s0921-4526(99)02830-6 ◽

2000 ◽

Vol 284-288 ◽

pp. 1663-1664 ◽

Cited By ~ 5

Author(s):

Mikio Koyano ◽

Atsushi Miyata ◽

Hiroyuki Hara

Keyword(s):

Electrical Conductivity ◽

Charge Density ◽

Charge Density Wave ◽

Collective Motion ◽

Density Wave ◽

Two Dimensional ◽

Anisotropic Behavior

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Early Homoepitaxy of Au and pt (100) with Surface-Embedded-Atom Potentials

MRS Proceedings ◽

10.1557/proc-280-69 ◽

1992 ◽

Vol 280 ◽

Author(s):

Michael I. Haftel ◽

Mervine Rosen

Keyword(s):

Surface Properties ◽

Surface Reconstruction ◽

Vapor Deposition ◽

Strong Influence ◽

Collective Motion ◽

Surface Structures ◽

Two Dimensional ◽

Corrugated Surface ◽

Embedded Atom ◽

Monolayer Coverage

ABSTRACTUsing embedded atom potentials fit to both bulk and surface properties, we explore the submonolayer vapor deposition of Au and Pt onto reconstructed (100) surfaces with the MD code DAMSEL. The surface geometries are determined by computational annealing over .6 ns. Surface reconstruction has a strong influence on the effects of adatoms. In Au and Pt the deposited atoms are absorbed into the surface and surface structures form by atomic replacement sequences and collective motion over the surface and substrate. On Au the reconstructed corrugated surface evolves into one characterized by two-dimensional mounds as coverage is increased. On reconstructed Pt, which exhibits alternately quasihexagonal and bulk-like regions, adatoms initially form strings above the bulk-like regions parallel to the (110] corrugation rows. At about .5 monolayer coverage the quasihexagonal structure of the top substrate layer transitions to a bulk-like structure in both Au and Pt

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