4,873 research outputs found
The Japanese Experience with Urban Private Rail Companies: Idiosyncratic or Exemplary?
Institute of Transport and Logistics Studies. Business School. The University of Sydney
The Japanese Experience with Urban Private Rail Companies: Idiosyncratic or Exemplary?
Institute of Transport and Logistics Studies. Business School. The University of Sydney
Matrix product states approach to the Heisenberg ferrimagnetic spin chains
We propose a new version of the matrix product (MP) states approach to the
description of quantum spin chains, which allows one to construct MP states
with certain total spin and its z-projection. We show that previously known MP
wavefunctions for integer-spin antiferromagnetic chains and ladders correspond
to some particular cases of our general ansatz. Our method allows to describe
systems with spontaneously broken rotational symmetry, like quantum
ferrimagnetic chains whose ground state has nonzero total spin. We apply this
approach to describe the ground state properties of the isotropic ferrimagnetic
Heisenberg chain with alternating spins 1 and 1/2 and compare our variational
results with the high-precision numerical data obtained by means of the quantum
Monte Carlo (QMC) method. For both the ground state energy and the correlation
functions we obtain very good agreement between the variational results and the
QMC data.Comment: 4 pages, RevTeX, uses psfig.sty, submitted to Phys. Rev.
Effect of salinity on growth and survival of juvenile Indian spiny lobster, Panulirus homarus (Linnaeus)
The spiny lobster, Panulirus homarus has recently captured much attention in India for fattening in marine cages due to its
high demand in the international market. Water quality parameters play an important role in the production rate of commercial
lobster mariculture. In the present study, juvenile lobsters (93.63 ± 0.4 g, mean ± SD; 41.66 ± 0.57 mm CL, mean ± SD)
were grown in four different salinities (20, 25, 30 and 35 ppt) over a period of 80 d and significant differences (p<0.01) were
observed in survival and growth. Growth was highest in 35 ppt salinity and progressively reduced at lower salinities. Although
rearing in seawater of 35 ppt salinity has resulted in the best performance for P. homarus, its capacity to tolerate lower
salinities would provide greater opportunity to develop commercial aquaculture
Competing Ground States of a Peierls-Hubbard Nanotube
Motivated by iodo platinum complexes assembled within a quadratic-prism
lattice, [Pt(CHN)(CHN)I](NO), we
investigate the ground-state properties of a Peierls-Hubbard four-legged tube.
Making a group-theoretical analysis, we systematically reveal a variety of
valence arrangements, including half-metallic charge-density-wave states.
Quantum and thermal phase competition is numerically demonstrated with
particular emphasis on doping-induced successive insulator-to-metal transitions
with conductivity increasing stepwise.Comment: 6 pages, 4 figures. to be published in Europhys. Lett. 87 (2009)
1700
Topology conserving gauge action and the overlap-Dirac operator
We apply the topology conserving gauge action proposed by Luescher to the
four-dimensional lattice QCD simulation in the quenched approximation. With
this gauge action the topological charge is stabilized along the hybrid Monte
Carlo updates compared to the standard Wilson gauge action. The quark potential
and renormalized coupling constant are in good agreement with the results
obtained with the Wilson gauge action. We also investigate the low-lying
eigenvalue distribution of the hermitian Wilson-Dirac operator, which is
relevant for the construction of the overlap-Dirac operator.Comment: 27pages, 11figures, accepted versio
Optimization of the Coil Current Configuration of Local Island Divertor Coils for Minimizing Magnetic Islands Induced by the Error Field
Simulations of the Radial Profiles of Neutral Particle Density in Hydrogen and Helium Plasmas in the LHD
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