摘要:

We propose a new modeling of convective motions in powder which Faraday has observed in 1831 for the first time. In this model, powder is treated as a set of elastic particles with viscostic interaction. In the two dimensional modeling, convective motions are induced by the instability. This instability turns out to be caused by elasticity.

ISSN:0094-243X    

DOI:10.1063/1.42390

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Growth features of the aggregates including surface diffusion processes are studied by the Monte Carlo simulations on two‐dimensional square lattice. Anisotropy of dendritic pattern changes from ⟨10⟩ direction to ⟨11⟩ one depending on the surface diffusion mechanism. Homogenous diffusion‐limited aggregation (DLA) grows in the crossover domain between two anisotropies. Results indicate that the random tip‐splitting mechanism of the hottest tips is necessary to hold the homogeneity and self‐similarity of DLA pattern.

ISSN:0094-243X    

DOI:10.1063/1.42391

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

A molecular dynamics study has been carried out of calcium chloride crystal and melt. We have empirically determined the potential parameters for Ca2+and Cl−by performing MD runs of capCl2crystal at room temperature. The computer‐generated structure of molten CaCl2seemed to be realistic in comparison with our X‐ray diffraction data.

ISSN:0094-243X    

DOI:10.1063/1.42392

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

We study the relaxational modes in the Glauber dynamics and their contribution to the spin auto‐correlation function by means of numerical diagonalization. Differences in the dynamics between the disordered and the ordered phase are discussed.

ISSN:0094-243X    

DOI:10.1063/1.42393

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

In convective systems the first emerging patterns are often straight convection rolls. Bringing the wavelength of these rolls into competition with the wavelength of a spatial modulation of the external stress, one can investigate in convective systems also commensurate/incommensurate transitions. We here report that by a spatially modulated external stress also new patterns like undulated convection rolls or skew‐varicose type patterns can be forced.

ISSN:0094-243X    

DOI:10.1063/1.42394

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Model of self‐avoiding polymerized vesicles are investigated by Monte Carlo simulations. Flaccid polymerized vesicles are not crumpled, while deflated polymerized vesicles exhibit fully collapsed configuration.

ISSN:0094-243X    

DOI:10.1063/1.42395

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Domain growth in a system with quenched random impurities for the conserved scalar order parameter is investigated using a cell‐dynamics method. We find that the growth rate of domains are reduced due to the pinning by impurities.

ISSN:0094-243X    

DOI:10.1063/1.42396

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

Clustering motion of particles is found in Hamiltonian dynamics of symplectic coupled map systems. Particles assemble and move with strong correlation. The motion is chaotic but is distinguishable from random chaotic motion. Lyapunov analysis distinguishes global instability and local fluctuations. Cluster motions have finite lifetime. It has a fractal geometric structure in the phase space, and trapped to ruins of KAM and islands.

ISSN:0094-243X    

DOI:10.1063/1.42397

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

A model of a large population of coupled limit‐cycle oscillators is numerically shown to exhibit a transition to a peculiar phase of entrainment with glass‐like behavior.

ISSN:0094-243X    

DOI:10.1063/1.42398

出版商:AIP    

年代:1992

数据来源: AIP

摘要:

The structural relaxation process has been examined by a Monte Carlo simulation for a two‐dimensional XY clock model that has two transition points, a Kosterlitz‐Thouless transition atTKTand a long range order transtiion atTC(TC<TKT). The system was quenched from the middle temperature phase betweenTCandTKTto low temperature phase belowTC. The structure relaxation rate at low temperature phase is slower for the initial middle temperature state that has been created directly from the high temperature phase aboveTKTthan that created from the low temperature phase belowTC, both middle temperature phases being kept for the time insufficient for equilibration.

ISSN:0094-243X    

DOI:10.1063/1.42467

出版商:AIP    

年代:1992

数据来源: AIP