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136 results on '"Rosato, A. D."'

3. Monte Carlo and MD Modeling of Density Relaxation by Tapping

Author

Dybenko, O., Rosato, A. D., Horntrop, D. J., Ratnaswamy, V., and Kondic, L.

Subjects
Condensed Matter - Disordered Systems and Neural Networks
Abstract

The density relaxation phenomenon is modeled using both Monte Carlo and dissipative MD simulations to investigate the effects of regular taps applied to a vessel having a planar floor filled with monodisperse spheres. Results suggest the existence of a critical tap intensity that depends on the mass overburden, which produces a maximum bulk solids fraction. We find that the mechanism responsible for the relaxation phenomenon is evolving quasi-ordered packing structure propagating upwards from the plane floor., Comment: 4 pages, 6 figures

Published
2009

11. Single versus Multiple Authorship in Professional Journals.

Author

Crase, Darrell and Rosato, Frank D.

Abstract

To investigate the merits of single versus multiple authorship in scholarly journals, several journals were examined regarding degrees of single versus multiple authorship, posture of multiple authorship, and author-article ratio of three physical education, recreation, and dance periodicals. The article discusses ramifications of the increasing trend toward multiple authorship. (SM)

Published
1992

21. Exercise and Aging: New Perspectives and Educational Approaches.

Author

Crase, Darrell and Rosato, Frank D.

Abstract

Several factors have focused new attention on aging and the aged. A major concern emanating from these has been the role of physical fitness upon the health status of the aging. Benefits of exercise and educational and curricular modifications are identified to promote health and well-being among the elderly. (Author/BEF)

Published
1979

31. Temporal Dynamics in Density Relaxation

Author

Rosato, A. D., primary, Ratnaswamy, V., additional, Horntrop, D. J., additional, Dybenko, O., additional, Kondic, L., additional, Goddard, Joe, additional, Giovine, Pasquale, additional, and Jenkins, James T., additional

Published
2010
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34. Size Segregation in Cylindrical Horizontal Couette Flows of Particles: Experiments and Simulations

Author

Rosato, Anthony D., Blackmore, Denis L., Karion, A., Hunt, M. L., Rosato, Anthony D., Blackmore, Denis L., Karion, A., and Hunt, M. L.

Abstract

The dynamics of a granular mixture can differ significantly from those of a same-size flow. For example, shearing of granular materials often leads to unwanted segregation of particles of different sizes. This research uses both experiments and discrete element computer simulations to study the segregation occurring in a cylindrical Couette flow. Both experiments and simulations show a complex segregation pattern in which the concentration of large particles varies with both the radial coordinate and the angular location in the cylinder. The large particles rise to the free surface at the top of the cylindrical container and also line the outer cylinder. The number of layers of large particles around the stationary outer cylinder varies with the angular coordinate.

Published
2000

37. Dynamical systems model and discrete element simulations of a tapped granular column.

Author

Rosato, A. D., Blackmore, D., Tricoche, X. M., Urban, K., and Zuo, L.

Subjects
*GRANULAR materials, *DYNAMICAL systems, *MASS (Physics), *ENERGY dissipation, *LOADING & unloading, *VIBRATION (Mechanics), *CHAOS theory, *BIFURCATION theory
Abstract

We present an approximate dynamical systems model for the mass center trajectory of a tapped column of N uniform, inelastic, spheres (diameter d), in which collisional energy loss is governed by the Walton-Braun linear loading-unloading soft interaction. Rigorous analysis of the model, akin to the equations for the motion of a single bouncing ball on a vibrating plate, reveals a parameter γ:2aω2(1+e)/g that gauges the dynamical regimes and their transitions. In particular, we find bifurcations from periodic to chaotic dynamics that depend on frequency ω, amplitude a/d of the tap. Dynamics predicted by the model are also qualitatively observed in discrete element simulations carried out over a broad range of the tap parameters. [ABSTRACT FROM AUTHOR]

Published
2013
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