11,997 research outputs found
An effective Nuclear Model: from Nuclear Matter to Finite Nuclei
The momentum and density dependence of mean fields in symmetric and
asymmetric nuclear matter are analysed using the simple density dependent
finite range effective interaction containing a single Gaussian term alongwith
the zero-range terms. Within the formalism developed, it is possible to
reproduce the various diverging predictions on the momentum and density
dependence of isovector part of the mean field in asymmetric matter. The finite
nucleus calculation is formulated for the simple Gaussian interaction in the
framework of quasilocal density functional theory. The prediction of energies
and charge radii of the interaction for the spherical nuclei compares well with
the results of other effective theories.Comment: 10 pages, 3 figures, 2 tables, To appear in the Proceedings of the
11th International Conference on Nucleus-Nucleus Collisions (NN2012), May
27-June 1, 2012, San Antonio, Texas, US
Application development for multicore processor
With multicore processors now in every computer, server, and embedded device, the need for cost-effective, reliable parallel software has never been greater. The efficiency of single core processors does not match the necessary levels for the development of applications
Neutron-proton effective mass splitting and thermal evolution in neutron rich matter
The thermal evolution of properties of neutron rich asymmetric nuclear matter
such as entropy density, internal energy density, free energy density and
pressure are studied in the non-relativistic mean field theory using finite
range effective interactions. In this framework the thermal evolution of
nuclear matter properties is directly connected to the neutron and proton
effective mass properties. Depending on the magnitude of neutron-proton
effective mass splittings, two distinct behaviours in the thermal evolution of
nuclear matter properties are noticed.Comment: 19 pages, 9 figures, Submitted to J.Phys.G:Nucl.Part.Phy
VHE Gamma-ray Afterglow Emission from Nearby GRBs
Gamma-ray Bursts (GRBs) are among the potential extragalactic sources of
very-high-energy (VHE) gamma-rays. We discuss the prospects of detecting VHE
gamma-rays with current ground-based Cherenkov instruments during the afterglow
phase. Using the fireball model, we calculate the synchrotron self-Compton
(SSC) emission from forward-shock electrons. The modeled results are compared
with the observational afterglow data taken with and/or the sensitivity level
of ground-based VHE instruments (e.g. STACEE, H.E.S.S., MAGIC, VERITAS, and
Whipple). We find that modeled SSC emission from bright and nearby bursts such
as GRB 030329 are detectable by these instruments even with a delayed
observation time of ~10 hours.Comment: Proceeding of "Heidelberg International Symposium on High Energy
Gamma-Ray Astronomy", held in Heidelberg, 7-11 July 2008, submitted to AIP
Conference Proceedings. 4 pages, 3 figures, 1 tabl
On Spatial Consensus Formation: Is the Sznajd Model Different from a Voter Model?
In this paper, we investigate the so-called ``Sznajd Model'' (SM) in one
dimension, which is a simple cellular automata approach to consensus formation
among two opposite opinions (described by spin up or down). To elucidate the SM
dynamics, we first provide results of computer simulations for the
spatio-temporal evolution of the opinion distribution , the evolution of
magnetization , the distribution of decision times and
relaxation times . In the main part of the paper, it is shown that the
SM can be completely reformulated in terms of a linear VM, where the transition
rates towards a given opinion are directly proportional to frequency of the
respective opinion of the second-nearest neighbors (no matter what the nearest
neighbors are). So, the SM dynamics can be reduced to one rule, ``Just follow
your second-nearest neighbor''. The equivalence is demonstrated by extensive
computer simulations that show the same behavior between SM and VM in terms of
, , , , and the final attractor statistics. The
reformulation of the SM in terms of a VM involves a new parameter , to
bias between anti- and ferromagnetic decisions in the case of frustration. We
show that plays a crucial role in explaining the phase transition
observed in SM. We further explore the role of synchronous versus asynchronous
update rules on the intermediate dynamics and the final attractors. Compared to
the original SM, we find three additional attractors, two of them related to an
asymmetric coexistence between the opposite opinions.Comment: 22 pages, 20 figures. For related publications see
http://www.ais.fraunhofer.de/~fran
Trace element analysis of fly ash samples by EDXRF technique
Trace element analysis of some fly ash samples and soil samples have been
carried out by Energy Dispersive X-Ray Fluorescence technique. Fourteen elements
namely K, Ca, Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Se, Rb, Sr and Pb have been quantified
in the fly ash samples by this technique. It was found that there is no huge
concentration difference between the fly ash and soil samples as a result of which
fly ash can be used as soil manure without any adverse impact on the plants.Trace element analysis of fly ash samples by EDXRF technique
T R Rautray1*, B Behera1, T Badapanda1, V Vijayan2 and S Panigrahi1
1Department of Physics, National Institute of Technology, Rourkela-769 008, Orissa,
India
2Department of Physics, Valliammai Engineering College, SRM Nagar, Chennai-603 203,
Tamil Nadu, India
E-mail : [email protected] of Physics, National Institute of Technology, Rourkela-769 008, Orissa,
India
2Department of Physics, Valliammai Engineering College, SRM Nagar, Chennai-603 203,
Tamil Nadu, Indi
- …