9,619 research outputs found
Nuclear incompressibility using the density dependent M3Y effective interaction
A density dependent M3Y effective nucleon-nucleon (NN) interaction which was
based on the G-matrix elements of the Reid-Elliott NN potential has been used
to determine the incompressibity of infinite nuclear matter. The nuclear
interaction potential obtained by folding in the density distribution functions
of two interacting nuclei with this density dependent M3Y effective interaction
had been shown earlier to provide excellent descriptions for medium and high
energy and heavy ion elastic scatterings as well as and heavy
cluster radioactivities. The density dependent parameters have been chosen to
reproduce the saturation energy per nucleon and the saturation density of spin
and isospin symmetric cold infinite nuclear matter. The result of such
calculations for nuclear incompressibility using the density dependent M3Y
effective interaction based on the G-matrix elements of Reid-Elliott NN
potential predicts a value of about 300 MeV for nuclear incompressibility.Comment: 4 Page
Some aspects of preparation of Coal for Coking (11)
THE plans for India's industrial expansion envisage
manifold increase in all branches of engineering indus-tries with a concomrnittant increase in the production and consumption of all quality of coals.
Although India has fairly large reserves of inferior
grades of coals, her resources of coking coals, including
the washable reserves, are by no means plentiful. To meet the demand of increasing production of steel for the succ- essive Five Year plans, the consumption of coking coal will he stepped up inauy tines. This will result in even a quicker rate of depletion of the dwindling reserves of cobing Coals. There can, therefore, be no difference of opinion about the need for restricting the use of metall-urgical coals for coking purpose alone and for the adop-tion of suitable means for the beneficiation of the high ash coals.
The installation of the coal washing plants, both in the private as well as public sectors, and the projects of erecting more washeries are concrete steps towards this objective, but much still remains to be done, and it has to be admitted that the magnitude of the problem has not yet been fully realised
Ultrahigh energy neutrinos and non-linear QCD dynamics
The ultrahigh energy neutrino-nucleon cross sections are computed taking into
account different phenomenological implementations of the non-linear QCD
dynamic s. Based on the color dipole framework, the results for the saturation
model supplemented by DGLAP evolution as well as for the BFKL formalism in the
geometric scaling regime are presented. They are contrasted with recent
calculations using NLO DGLAP and unified BFKL-DGLAP formalisms.Comment: 5 pages, 2 figures. Version to be published in Physical Review
Equation of state for nuclear matter based on density dependent effective interaction
An interesting method of obtaining equation of state for nuclear matter, from
a density dependent M3Y interaction, by minimizing the energy per nucleon is
described. The density dependence parameters of the interaction are obtained by
reproducing the saturation energy per nucleon and the saturation density of
spin and isospin symmetric cold infinite nuclear matter. The nuclear matter
equation of state thus obtained is then used to calculate the pressure, the
energy density, the nuclear incompressibility and the velocity of sound in
nuclear medium. The results obtained are in good agreement with experimental
data and provide a unified description of radioactivity, scattering and nuclear
matter.Comment: 10 pages including 2 figure
Phase structure of matrix quantum mechanics at finite temperature
We study matrix quantum mechanics at finite temperature by Monte Carlo
simulation. The model is obtained by dimensionally reducing 10d U(N) pure
Yang-Mills theory to 1d. Following Aharony et al., one can view the same model
as describing the high temperature regime of (1+1)d U(N) super Yang-Mills
theory on a circle. In this interpretation an analog of the deconfinement
transition was conjectured to be a continuation of the black-hole/black-string
transition in the dual gravity theory. Our detailed analysis in the critical
regime up to N=32 suggests the existence of the non-uniform phase, in which the
eigenvalue distribution of the holonomy matrix is non-uniform but gapless. The
transition to the gapped phase is of second order. The internal energy is
constant (giving the ground state energy) in the uniform phase, and rises
quadratically in the non-uniform phase, which implies that the transition
between these two phases is of third order.Comment: 17 pages, 9 figures, (v2) refined arguments in section 3 ; reference
adde
Quality Perspective of Polytechnic Education in West Bengal
Technical Education is one of the more significant components of Human Resource Development spectrum with great potential for adding value to products and services and for contributing to the national economy and improving quality of life of the people. Technician education has made steady progress in meeting the demand of middle level technical personnel for various sectors of national development. Quality issues in technical education are very important aspect since it bears a direct impact on the improvement of the education process
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