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This paper describes the progress that has been made in the past decade in the investigation of the peculiar dynamic properties of vitreous silica (v-SiO2) and related glasses in the terahertz (THz) frequency range. The reason why we focus our attention on v-SiO2 is that it is one of the principal network glasses and exhibits all features typical of… (More)

We investigate the effect of permeant flow on the sedimentation of porous fractalaggregates in water. Our theoretical analysis gives explicit calculations on the scaling behaviours of settling velocities, taking into account the fractality through a proper permeability for fractal aggregates. The calculated results for the scaling behaviours of settling… (More)

The forced oscillator method (FOM) is particularly suitable to treat very large matrices by using advanced modern supercomputers. This method enables us to calculate in an efficient way spectral densities, eigenvalues, and their eigenvectors of large-scale matrices. In addition, linear response functions of systems described by these matrices can be… (More)

We point out that the non-adiabatic orientation of quantum rotors, produced by ultrashort laser pulses, is remarkably enhanced by introducing dipolar interaction between the rotors. This enhanced orientation of quantum rotors is in contrast with the behavior of classical paired rotors, in which dipolar interactions prevent the orientation of the rotors. We… (More)

- Tsuneyoshi Nakayama, Eiji Kanashita
- 2008

Almost identical thermal properties of type-I clathrate compounds to those of glasses follow naturally from the consideration that off-centered guest ions possess electric dipole moments. Local fields from neighbor dipoles create many potential minima in the configuration space. A theoretical analysis based on two-level tunneling states demonstrates that… (More)

- Hiroyuki Shima, Tsuneyoshi Nakayama
- Microelectronics Journal
- 2005

- Tsuneyoshi Nakayama
- Encyclopedia of Complexity and Systems Science
- 2009

To probe the universality class of the quantum Hall system at the metalinsulator critical point, the multifractality of the wave function ψ is studied for higher Landau levels, N = 1, 2, for various range (σ) of random potential. We have found that, while the multifractal spectrum f(α) (and consequently the fractal dimension) does vary withN , the parabolic… (More)

- Takamichi Terao, Tsuneyoshi Nakayama
- Physical review. E, Statistical, nonlinear, and…
- 2002

We investigate the adsorption of colloidal particles on a charged surface by the cluster Monte Carlo simulation. Under the primitive model of asymmetric electrolytes, the density profiles of colloidal particles at a surface are analyzed as a function of the electrostatic coupling parameter. In the strong coupling regime numerical results show the… (More)

- Eiji Kanashita, Tsuneyoshi Nakayama
- 2009

We present the quantitative interpretation for the glass-like behavior of thermal conductivities κ(T ) for type-I clathrate compounds involving off-centered guest ions. It is shown that the dipole-dipole interaction generated in cage/guest-ion systems is crucial to reproduce the characteristics of thermal conductivities for these symmetry-broken clathrates.… (More)