778 research outputs found
Chaos and Universality in a Four-Dimensional Spin Glass
We present a finite size scaling analysis of Monte Carlo simulation results
on a four dimensional Ising spin glass. We study chaos with both coupling and
temperature perturbations, and find the same chaos exponent in each case. Chaos
is investigated both at the critical temperature and below where it seems to be
more efficient (larger exponent). Dimension four seems to be above the critical
dimension where chaos with temperature is no more present in the critical
region. Our results are consistent with the Gaussian and bimodal coupling
distributions being in the same universality class.Comment: 11 pages, including 6 postscript figures. Latex with revtex macro
Observations of classical novae in outburst
The IUE obtained ultraviolet data on novae in outburst. The characteristics of every one of the outbursts are different. Optical and infrared data on many of the same novae were also obtained. Three members of the carbon-oxygen class of novae are presented
Maturação de tubérculos da cultivar de batata BRS Ana.
bitstream/item/82142/1/Boletim-166-1.pd
Caracteres de produção e qualidade de clones de batata selecionados de população segregante para resistência ao vÃrus Y da batata.
bitstream/item/30412/1/boletim-67.pd
Evaluation of the safety of high-frequency chest wall oscillation (HFCWO) therapy in blunt thoracic trauma patients
Numerical Study of Order in a Gauge Glass Model
The XY model with quenched random phase shifts is studied by a T=0 finite
size defect energy scaling method in 2d and 3d. The defect energy is defined by
a change in the boundary conditions from those compatible with the true ground
state configuration for a given realization of disorder. A numerical technique,
which is exact in principle, is used to evaluate this energy and to estimate
the stiffness exponent . This method gives in
2d and in 3d, which are considerably larger than
previous estimates, strongly suggesting that the lower critical dimension is
less than three. Some arguments in favor of these new estimates are given.Comment: 4 pages, 2 figures, revtex. Submitted to Phys. Rev. Let
Caracteres agronômicos de uma população de clones de batata Selecionadas para Resistência à Requeima.
bitstream/item/30550/1/boletim-108.pd
Numerical Study of Spin and Chiral Order in a Two-Dimensional XY Spin Glass
The two dimensional XY spin glass is studied numerically by a finite size
scaling method at T=0 in the vortex representation which allows us to compute
the exact (in principle) spin and chiral domain wall energies. We confirm
earlier predictions that there is no glass phase at any finite T. Our results
strongly support the conjecture that both spin and chiral order have the same
correlation length exponent . We obtain preliminary results
in 3d.Comment: 4 pages, 2 figures, revte
Structure and peculiarities of the (8 x n)-type Si(001) surface prepared in a molecular-beam epitaxy chamber: a scanning tunneling microscopy study
A clean Si(001) surface thermally purified in an ultrahigh vacuum
molecular-beam epitaxy chamber has been investigated by means of scanning
tunneling microscopy. The morphological peculiarities of the Si(001) surface
have been explored in detail. The classification of the surface structure
elements has been carried out, the dimensions of the elements have been
measured, and the relative heights of the surface relief have been determined.
A reconstruction of the Si(001) surface prepared in the molecular-beam epitaxy
chamber has been found to be (8 x n). A model of the Si(001)-(8 x n) surface
structure is proposed.Comment: 4 pages, 8 figures. Complete versio
Preferências do consumidor de batatas no sul do Estado do Rio Grande do Sul.
bitstream/item/31487/1/comunicado-212.pd
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