Faculty Profiles - TSURUTA Kenji

Papers - TSURUTA Kenji

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Early stages of sintering of silicon nitride nanoclusters: A molecular-dynamics study on parallel machines Reviewed

K Tsuruta, A Omeltchenko, RK Kalia, P Vashishta

EUROPHYSICS LETTERS 33 ( 6 ) 441 - 446 1996.2

Language：English Publishing type：Research paper (scientific journal) Publisher：EDITIONS PHYSIQUE

Sintering of Si3N4 nanoclusters is investigated With the molecular-dynamics approach. At 2000 K thermally rough nanocrystals develop an asymmetric neck in 100 picoseconds. The neck contains more fourfold than threefold coordinated Si atoms, Amorphous nanoclusters develop a symmetric neck which has nearly equal number of threefold and fourfold coordinated Si atoms. In both cases, sintering is driven by surface diffusion of Si and N atoms. The diffusion is much more rapid in the neck joining amorphous nanoclusters than in the neck region of nanocrystals.

DOI： 10.1209/epl/i1996-00359-2

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Early stages of sintering of Si3N4 nanoclusters via parallel molecular dynamics Reviewed

K Tsuruta, A Omeltchenko, RK Kalia, P Vashishta

MATERIALS THEORY, SIMULATIONS, AND PARALLEL ALGORITHMS 408 181 - 186 1996

Sintering of amorphous Si3N4 nanoclusters: A molecular dynamics study of stress analysis Reviewed

JH Wang, K Tsuruta, A Omeltchenko, RK Kalia, P Vashishta

MATERIALS THEORY, SIMULATIONS, AND PARALLEL ALGORITHMS 408 573 - 578 1996

Dense plasma as a statistical ensemble of Coulomb clusters: A new paradigm Reviewed

K TSURUTA, S ICHIMARU

NON-NEUTRAL PLASMA PHYSICS II ( 331 ) 252 - 261 1995

Erratum: Short-range screening potentials for classical Coulomb fluids: Monte Carlo sampling and cluster model studies (Physical Review E (1995) 51, 4, (3788)) Reviewed

Ichimaru S, Ogata S, Tsuruta K

Physical Review E 51 ( 4 ) 3788 - 3788 1995

SHORT-RANGE SCREENING POTENTIALS FOR CLASSICAL COULOMB FLUIDS - MONTE-CARLO SAMPLING AND CLUSTER MODEL STUDIES Reviewed

S ICHIMARU, S OGATA, K TSURUTA

PHYSICAL REVIEW E 50 ( 4 ) 2977 - 2985 1994.10

Language：English Publishing type：Research paper (scientific journal) Publisher：AMERICAN PHYSICAL SOC

Screening potential, the balance between the bare Coulomb repulsion and the potential of mean force in a charged liquid, plays an essential role in the theoretical estimation of enhancement for the nuclear reaction rates in dense stellar matter. For the accurate assessment of the screening potential at short interparticle separations, we revisit the first-principles calculations for the coefficients of the Widom expansion and undertake extra-long Monte Carlo samplings in specifically designed binary-ionic systems. The results are compared with those obtained from an approximate estimation based on extrapolation from intermediate distances. We also present model calculations of the screening potential with two-ion clusters, which shed light on the relation between the short- and intermediate-range behaviors.

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BINDING-ENERGY, MICROSTRUCTURE, AND SHELL-MODEL OF COULOMB CLUSTERS Reviewed

K TSURUTA, S ICHIMARU

PHYSICAL REVIEW A 48 ( 2 ) 1339 - 1344 1993.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMERICAN PHYSICAL SOC

By computer-simulation and analytic studies for binding energies and microscopic shell structures, it is shown that Coulomb clusters assume particularly stable configurations at certain ''magic numbers'' of particles. Through analyses with the spherical Voronoi numbers, a special role that the icosahedral geometry plays in shaping the particle configurations on the spherical surfaces is elucidated. Gross features in the cluster structures, such as the shell radii and intershell partition of particles, are well accounted for by an appropriate shell model.

DOI： 10.1103/PhysRevA.48.1339

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Collisional equipartition rate for a magnetized pure electron plasma Reviewed

Michael E. Glinsky, Thomas M. O'Neil, Marshall N. Rosenbluth, Kenji Tsuruta, Setsuo Ichimaru

Physics of Fluids B 4 ( 5 ) 1156 - 1166 1992

Language：English Publishing type：Research paper (scientific journal)

The collisional equipartition rate between the parallel and perpendicular velocity components is calculated for a weakly correlated electron plasma that is immersed in a uniform magnetic field. Here, parallel and perpendicular refer to the direction of the magnetic field. The rate depends on the parameter κ̄ = (b̄/rc)/√2, where rc = √T/m/Ωc is the cyclotron radius and b̄ = 2e 2/T is twice the distance of closest approach. For a strongly magnetized plasma (i.e., κ̄ ≫ 1), the equipartition rate is exponentially small (v∼exp[ -5(3πκ̄)2/5/6]). For a weakly magnetized plasma (i.e., κ̄ ≪ 1), the rate is the same as for an unmagnetized plasma except that rc/b̄ replaces λD/b̄ in the Coulomb logarithm. (It is assumed here that rc &lt
λD
for rc &gt
λD, the plasma is effectively unmagnetized.) This paper contains a numerical treatment that spans the intermediate regime κ̄∼1, and connects onto asymptotic results in the two limits κ̄ ≪ 1 and κ̄ ≫ 1. Also, an improved asymptotic expression for the rate in the high-field limit is derived. The present theoretical results are in good agreement with recent measurements of the equipartition rate over eight decades in κ̄ and four decades in the scaled rate v/nv̄b̄2, where n is the electron density and v̄ = √2T/m. © 1992 American Institute of Physics.

DOI： 10.1063/1.860124

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