8,703 research outputs found
Dundee Discussion Papers in Economics 256:How much does industry matter in an emerging market economy?
Nonequilibrium Fluctuation Relation for Sheared Micellar Gel in a Jammed State
We show that the shear rate at a fixed shear stress in a micellar gel in a
jammed state exhibits large fluctuations, showing positive and negative values,
with the mean shear rate being positive. The resulting probability distribution
functions (PDF's) of the global power flux to the system vary from Gaussian to
non-Gaussian, depending on the driving stress and in all cases show similar
symmetry properties as predicted by Gallavotti-Cohen steady state fluctuation
relation. The fluctuation relation allows us to determine an effective
temperature related to the structural constraints of the jammed state. We have
measured the stress dependence of the effective temperature. Further,
experiments reveal that the effective temperature and the standard deviation of
the shear rate fluctuations increase with the decrease of the system size.Comment: 5 pages 3 figure
Black Hole Accretion: From Quasars to Nano-Quasars
In this review we shall comment on a few recent findings which strengthen the
view that the black hole accretion has substantial amount of sub-Keplerian
component. The manifestation of this component is many fold. We discuss some of
them. A general outline of the complex structure that emerges from the
multitude of observations is presented. A detailed outline of what might be
going on in outburst sources is also discussed. The relationship amount the
spectral and timing properties can be best understood by this picture. We claim
that the sub-Keplerian advective disk paradigm is a complete package. Since
signatures of sub-Keplerian motion is already increasing in the literature, the
whole package must be correct.Comment: 7 Pages, 2 Figures, Proceeding of the 2nd Kolkata Conference on
"Observational Evidence for the Black Holes in the Universe", Published in
AIP, 200
Ground state of an distorted diamond chain - model of
We study the ground state of the model Hamiltonian of the trimerized
quantum Heisenberg chain in which
the non-magnetic ground state is observed recently. This model consists of
stacked trimers and has three kinds of coupling constants between spins; the
intra-trimer coupling constant and the inter-trimer coupling constants
and . All of these constants are assumed to be antiferromagnetic. By
use of the analytical method and physical considerations, we show that there
are three phases on the plane (, ), the dimer phase, the spin fluid phase
and the ferrimagnetic phase. The dimer phase is caused by the frustration
effect. In the dimer phase, there exists the excitation gap between the
two-fold degenerate ground state and the first excited state, which explains
the non-magnetic ground state observed in . We also obtain the phase diagram on the
plane from the numerical diagonalization data for finite systems by use of the
Lanczos algorithm.Comment: LaTeX2e, 15 pages, 21 eps figures, typos corrected, slightly detailed
explanation adde
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