8,500 research outputs found
Electrically charged pulsars
n the present work we investigate one possible variation on the usual
electrically neutral pulsars: the inclusion of electric charge. We study the
effect of electric charge in pulsars assuming that the charge distribution is
proportional to the energy density. All calculations were performed for zero
temperature and fixed entropy equations of state
Caloric curve for finite nuclei in relativistic models
In this work we calculate the caloric curve (excitation energy per particle
as a function of temperature) for finite nuclei within the non--linear Walecka
model for different proton fractions. It is shown that the caloric curve is
sensitive to the proton fraction. Freeze-out volume effects in the caloric
curve are also studied.Comment: 11 pages, 1 figure, 4 table
Low density expansion and isospin dependence of nuclear energy functional: comparison between relativistic and Skyrme models
In the present work we take the non relativistic limit of relativistic models
and compare the obtained functionals with the usual Skyrme parametrization.
Relativistic models with both constant couplings and with density dependent
couplings are considered. While some models present very good results already
at the lowest order in the density, models with non-linear terms only reproduce
the energy functional if higher order terms are taken into account in the
expansion.Comment: 16 pages,6 figures,5 table
Quark matter equation of state and stellar properties
In this paper we study strange matter by investigating the stability window
within the QMDD model at zero temperature and check that it can explain the
very massive pulsar recently detected. We compare our results with the ones
obtained from the MIT bag model and see that the QMDD model can explain larger
masses, due to the stiffening of the equation of state
Remarkable thermal stability of BF3-doped polyaniline
We show that the recently synthesized BF3-doped polyaniline (PANI) exhibits
remarkable stability against thermal ageing. Unlike the protonated PANI, which
shows rapid degradation of the conductivity on heating in air, BF3-doped PANI
shows more than an order of magnitude improvement in conductivity. We employ
x-ray photoelectron spectroscopy (XPS), fourier transform infra-red (FTIR)
spectroscopy, and x-ray diffraction (XRD) to understand this unexpected
phenomenon.Comment: 4 pages and 3 figures. To appear in Applied Physics Letters, Sept.
200
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