092-583-8838

092-583-8841

Doctor of Science

Experimental statistical physics, Soft matter, Pattern formation

Granular impact and avalanche dynamics
When a solid projectile hits granular layer, a crater is created. We developed a accurate measurement system to study the stopping force of this impact cratering. We are also studying statistics and micro dynamics of intermittent granular avalanches. The relation between "jamming" and continuous granular flow is also examined.

Pattern formation on gelation surface
We found a dissipative structure on two-dimensional gelation surface. Dynamics governing this pattern formation and characteristic length scale of this pattern is investigated.

Critical fragmentation
My main interest is criticality of damage-fragmentation transition. Kun and Herrmann have predicted that the universality class of damage-fragmentation transition is same as that of percolation model. Their prediction is based on numerical simulations of granular solid model. I concluded that the universality class of critical fragmentation differs from that of percolation, and found the multi-scaling on weighted mean mass. I propose binomial multipicative model in order to desctibe that multi-scaling. Recently, we carried out explosive fragmentation experiments of thin tubes using pulsed power generator.

Mutiaffinity
Ballistic deposition model with power-law noise is investigated by multi-growth analysis. I found the asymptotic function of q-th order growth exponent and roughness exponent. KPZ with Quenched disorder model is studied by the multi-affine (and multi-growth) analysis method now. I'd like to know the relation between the KPZ universality robustness and the statistical property of the noise. Impact fragmentation phenomena of brittle solids are investigated experimentally.

Research Interests

• granular physics
  keyword : impact, crater, avalanche
  2005.10.
• pattern formation on a gelation surface
  keyword : gelation, dissipative structure, pattern formation
  2004.04～2005.09.
• fragment mass distribution of brittle fragmentation
  keyword : brittle fragmentation, fragment mass distribution, impact, explosion
  2002.04～2005.09.
• multi-scaling analysis of a rough surface
  keyword : rough surface, multi-fractal
  2001.01～2004.09.

Academic Activities

Membership in Academic Society

• The Physical Society of Japan
• Americal Physical Society