3,027 research outputs found
Radial Distribution Function for Superfluid 4He, and the Effect of Interaction Potentials Thereon
Potentiometric Studies on the Complex Formation of Some Ln(III) Ions with 4-Nitrocatechol
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Potentiometric Studies on the Complex Formation of Some Ln(III) Ions with 4-Nitrocatechol
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Calculation of Electric and Magnetic Field under AC Transmission and Distribution Lines in Guwahati City
With the increasing population rate and industrial growth rate, the demand for power has escalated significantly. High Voltage AC transmission can be termed as one of the measures to quench this increasing energy demands. This paper evaluates the safety limits for electric and magnetic fields generated around the AC transmission and distribution lines at various voltage levels and configuration. Surface current density for an average height human being has also been calculated for safety precautions.Keywords: Safety limits, electric field, magnetic field, surface current density*Cite as: Manash Jyoti Baishya, Satyajit Bhuyan, N.K.Kishore, “Calculation of Electric and Magnetic Field under AC Transmission and Distribution Lines in Guwahati City†ADBU J.Engg.Tech., 1(2014) 0011406(5pp
Correlation between the nuclear structure and reaction dynamics of Ar-isotopes as projectile using the relativistic mean-field approach
This theoretical study is devoted to bridging the gap between the nuclear
structure and reaction dynamics and unravelling their impact on each other,
considering the neutron-rich light mass 30-60Ar isotopes. Using the
relativistic mean-field with the NL3* parameter set, several bulk properties
such as binding energies, charge radii, quadrupole deformation parameter, two
neutron separation energy, and differential two neutron separation energy with
the shell closure parameter are probed for the mentioned isotopic chain. For
validation, the RMF (NL3*) results are compared with those obtained from the
finite range droplet model (FRDM), Weizsacker-Skyrme model with WS3, WS*
parameters and the available experimental data. Most of the participating
isotopes are found to be prolate in structure and neutron shell closures are
conspicuously revealed at N=14, 20, 40 but weakly shown at N=24, 28, 34. From
our analysis, a central depletion in the nucleonic density is identified in
32Ar and 42-58Ar, indicating them as possible candidates for a semi-bubble-like
structure. Interestingly, these results are consistent with recent theoretical
and experimentally measured data. Besides, using the Glauber model, the
reaction cross-sections are determined by taking 26-48Ar as projectiles and
stable targets such as 12C, 16O, 40Ca, 90Zr, 124,132Sn, 208Pb and 304120.
Although there is no experimental evidence for the stability of 304120, it has
been predicted in Ref. [Mod. Phys. Lett. A {\bf 27}, 1250173 (2012)] as a
stable nucleus. A relatively higher cross-section value is noticed between 30Ar
and 32Ar which infers that 32Ar is the most stable isotope among the considered
chain. Moreover, we noticed that the profile of the differential cross-sections
and scattering angle are highly influenced by the mass of the target nuclei and
the magnitude of the incident energy of the projectile nucleus.Comment: 19 pages, 7 figure
A new microscopic nucleon-nucleon interaction derived from relativistic mean field theory
A new microscopic nucleon-nucleon (NN) interaction has been derived for the
first time from the popular relativistic mean field theory (RMFT) Lagrangian.
The NN interaction so obtained remarkably relate to the inbuilt fundamental
parameters of RMFT. Furthermore, by folding it with the RMFT-densities of
cluster and daughter nuclei to obtain the optical potential, it's application
is also examined to study the exotic cluster radioactive decays, and results
obtained found comparable with the successfully used M3Y phenomenological
effective NN interactions. The presently derived NN-interaction can also be
used to calculate a number of other nuclear observables.Comment: 4 Pages 2 Figure
Enhanced thermoelectric properties in Sb/Ge core/shell nanowires through vacancy modulation
In the present work, we have modified the physical and electronic structure of Sb/Ge core/shell nanowires via vacancy creation and doping with foreign atoms with the aim to improve their thermoelectric energy conversion efficiency. Sb/Ge-NWs having a diameter of 1.5 Å show metallicity with 2Go quantum conductance. The stability of the nanowires is assessed through the calculation of their formation energy. The formation of one vacancy at either the Sb- and Ge-site modifies substantially the electronic properties. From the comparison of the thermoelectric properties of the nanowires with and without the vacancy, we have found that the figure of merit for the Sb/Ge NW with one Sb vacancy increases of 0.18 compared to the pristine NW. The NW doping with different transition metals: Fe, Co, Ni and Cu have been found to also enhance the conversion efficiency. Thus, our calculations show that the thermoelectric performance of metal–semiconductor core–shell NWs can be in principle improved as much as 80% by vacancy formation and doping
Preformation Probability and Kinematics of Clusters Emission yielding Pb-daughters
In the present study, the newly established preformation formula is applied
for the first time to study the kinematics of the cluster emission from various
radioactive nuclei, especially those decaying to the double-shell closure
Pb nucleus and its neighbours as daughters. The recently proposed
universal cluster preformation formula has been established based on the
concepts that underscore the influence of the mass and charge asymmetry
( and ), cluster mass and the Q-value, paving the way to
quantify the energy contribution during the preformation as well as the
tunnelling process separately. The cluster-daughter interaction potential is
obtained by folding the relativistic mean-field (RMF) densities with the
recently developed microscopic R3Y using the NL and the phenomenological
M3Y NN potentials to compare their adaptability. The penetration probabilities
are calculated from the WKB approximation. With the inclusion of the new
preformation probability , the predicted half-lives from the R3Y and M3Y
interactions are in good agreement with the experimental data. Furthermore, a
careful inspection reflects slight differences in the decay half-lives, which
arise from their respective barrier properties. The for the systems with
the double magic shell closure Pb daughter are found to be relatively
higher with an order of than those with neighbouring Pb-daughter
nuclei. By exploring the contributions of the decay energy, the recoil effect
of the daughter nucleus is appraised, unlike several other conjectures. Thus,
the centrality of the Q-value in the decay process is demonstrated and
re-defined within the preformed cluster-decay model. Besides, we have
introduced a simple and intuitive set of criteria that governs the estimation
of recoil energy in the cluster radioactivity.Comment: 09 Pages, 06 Figures, and 01 Tabl
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