2008 NOV 24 - (VerticalNews.com) -- "We propose a density matrix renormalization group (DMRG) technique at finite temperatures," researchers in Kyoto, Japan report.

  "As is the case of the ground-state DMRG, we use a single-target state that is calculated by making use of a regulated polynomial expansion. Both static and dynamical quantities are obtained after a random-sampling and averaging procedure," wrote S. Sota and colleagues, Kyoto University ...read more

  2008 NOV 24 - (VerticalNews.com) -- "We analyze the intermittent Brownian dynamics (a succession of adsorption and bulk relocation steps) of a test particle over a single strand. We propose an analytic expression of the relocation time distribution at all times," scientists in Palaiseau, France report.

  "We show that this distribution has a nontrivial heavily tailed statistics at long time with a diverging average relocation time. In order to experimentally probe this first passage statistics, we follow the intermittent Brownian dynamics of water molecules over long and stiff imogolite mineral strands, using a field cycling NMR dispersion technique. Our analytic derivation is found to be in good agreement with experimental data on a large domain of observation," wrote P. Levitz and colleagues ...read more

  2008 NOV 24 - (VerticalNews.com) -- According to a study from Netherlands, "Spontaneous spin-up, i.e., the significant increase of the total angular momentum of a flow that initially has no net angular momentum, is very characteristic for decaying two-dimensional turbulence in square domains bounded by rigid no-slip walls. In contrast, spontaneous spin-up is virtually absent for such flows in a circular domain with a no-slip boundary. ...read more