7,423 research outputs found
Model study of hot and dense baryonic matter
The properties of baryonic matter have been investigated at finite density
and temperature using different models. The variation of baryon masses and
fractional number densities with baryon density and temperature obtained from
different models have been compared. The quark hadron phase transition have
been studied using Chiral Colour Dieletric (CCD) model in the quark sector. No
phase transition has been seen for the different variants of the
Zimanyi-Moszkowski model. However, a phase transition is observed for the
linear and non-linear Walecka model.Comment: Latex, 16 postscript figures available on reques
Reclamation of copper-base scrap and residues
THE importance of secondary metals and alloys in copper and copper alloy industries is recognised when one considers that even in U. S. A., a country fairly rich
in copper ores, about half the consumption of copper is accounted for by secondary metals . When such is the case, there is every reason to believe that India can benefit substantially by improving its secondary copper and copper alloy industries as not only is our country relatively poor in copper ore deposits, but also her demand for copper, anticipated as 238 thousand tonnes in 1970-71 would be more than 15 times its estimated
licensed capacity- 16.5 thousand tonnes of fire refined blister copper at the end of the Fourth Plan.
Reclamation of Copper Base Scrap and Residues
The Railways' holdings of non-ferrous metals are estimated to exceed RS. 21 crores and a substantial portion of this amount is accounted for by the copper and copper base alloys. The annual outturn of the railway non-ferrous foundries amounts to about 23 thousand tonnes and accumalation of non-ferrous scrap at the end of March 1967 were reported as 11,400 tonnes. The value was esti-mated as Rs. 2.62 crores. The Railways reclaim most of their non-ferrous scrap arisings in their foundries; during the year 1966-67, 19,604 tonnes of non-ferrous scrap, mostly copper base, was utilised by the Railways for their own use and 1469 tonnes was disposed of to the trade
A generalization of Margolus-Levitin bound
The Margolus-Levitin lower bound on minimal time required for a state to be
transformed into an orthogonal state is generalized. It is shown that for some
initial states new bound is stronger than the Margolus-Levitin one.Comment: 6 pages, no figures; some comments added; final version accepted for
publication in Phys. Rev.
Effect of Fibonacci Modulation On Superconductivity
We have studied finite-sized single band models with short range pairing
interactions between electrons in presence of diagonal Fibonacci modulation in
one dimension. Two models, namely the attractive Hubbard model and the
Penson-Kolb model, have been investigated at half-filling at zero temperature
by solving the Bogoliubov-de Gennes equations in real space within a mean field
approximation. The competition between ``disorder'' and the pairing interaction
leads to a suppression of superconductivity (of usual pairs with zero
centre-of-mass momenta) in the strong-coupling limit while an enhancement of
the pairing correlation is observed in the weak-coupling regime for both the
models. However, the dissimilarity of the pairing mechanisms in these two
models brings about notable difference in the results. The extent to which the
bond ordered wave and the -paired (of pairs with centre-of-mass momenta =
) phases of the Penson-Kolb model are affected by the disorder has also
been studied in the present calculation. Some finite size effects are also
identified.Comment: 14 pages, 13 figure
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