808,527 research outputs found
Correlation between bulk and surface properties in Cd–X (X=Hg, Mg) liquid alloys
A theoretical investigation of the energetics and its effect on the alloying behaviour of Cd–Hg and Cd–Mg liquid
alloys have been carried out with the aim of correlating their bulk and surface phenomena. Using the
Quasi-chemical approximation for regular solution model, our results indicate that Cd–Hg and Cd–Mg are
weakly heterocoordinated both in the bulk and on the surface. We observed that the degree of chemical
order in Cd–Mg liquid alloy is more than that of Cd–Hg liquid alloy
Momentum Space Integral Equations for Three Charged Particles: Diagonal Kernels
It has been a long-standing question whether momentum space integral
equations of the Faddeev type are applicable to reactions of three charged
particles, in particular above the three-body threshold. For, the presence of
long-range Coulomb forces has been thought to give rise to such severe
singularities in their kernels that the latter may lack the compactness
property known to exist in the case of purely short-range interactions.
Employing the rigorously equivalent formulation in terms of an
effective-two-body theory we have proved in a preceding paper [Phys. Rev. C
{\bf 61}, 064006 (2000)] that, for all energies, the nondiagonal kernels
occurring in the integral equations which determine the transition amplitudes
for all binary collision processes, possess on and off the energy shell only
integrable singularities, provided all three particles have charges of the same
sign, i.e., all Coulomb interactions are repulsive. In the present paper we
prove that, for particles with charges of equal sign, the diagonal kernels, in
contrast, possess one, but only one, nonintegrable singularity. The latter can,
however, be isolated explicitly and dealt with in a well-defined manner. Taken
together these results imply that modified integral equations can be
formulated, with kernels that become compact after a few iterations. This
concludes the proof that standard solution methods can be used for the
calculation of all binary (i.e., (in-)elastic and rearrangement) amplitudes by
means of momentum space integral equations of the effective-two-body type.Comment: 36 pages, 2 figures, accepted for publication in Phys. Rev.
Magnetic polarizabilities of light mesons in lattice gauge theory
We investigate the masses (ground state energies) of neutral pseudoscalar and
vector meson in lattice gauge theory in strong abelian magnetic field.
The energy of meson with zero spin projection on the axis of
the external magnetic field decreases, while the energies with non-zero spins
and increase with the field. The energy of meson decrease
as a function of the magnetic field. We calculated the magnetic
polarizabilities of pseudoscalar and vector mesons for lattice volume .
For with spin and meson the extrapolations to zero
lattice spacing have been done. We do not observe any evidence in favour of
tachyonic mode existence.Comment: 9 pages, 13 figure
Proton-Deuteron Elastic Scattering from 2.5 to 22.5 MeV
We present the results of a calculation of differential cross sections and
polarization observables for proton-deuteron elastic scattering, for proton
laboratory energies from 2.5 to 22.5 MeV. The Paris potential parametrisation
of the nuclear force is used. As solution method for the charged-composite
particle equations the 'screening and renormalisation approach' is adopted
which allows to correctly take into account the Coulomb repulsion between the
two protons. Comparison is made with the precise experimental data of Sagara et
al. [Phys. Rev. C 50, 576 (1994)] and of Sperison et al. [Nucl. Phys. A422, 81
(1984)].Comment: 24 pages, 8 eps figures, uses REVTe
A comparative study of Zinc (II) ions removal by a locally produced Granular activated carbon
Physiochemical properties of wastewater effluent from the plants of a brewery in Lagos, Nigeria were analyzed. The adsorption capacity of
Granular activated carbon from animal horns when compared with the available commercial Granulated Activated Carbon (GAC) has
been presented. Kinetics of adsorption was also investigated. The adsorption isotherms could be well defined with Freundlich model
instead of Langmuir model for both GAC studied. The experimental data, when applied to the first and second-order kinetic models,
followed the first-order with r² = 0.931 for GAC from animal horns while commercial GAC followed the second-order with r² = 0.936. The
results illustrated how animal horns, a solid waste disposal menace from the abattoir at the Oshodi market in Lagos metropolis, was used
as an effective biosorbent for the removal of Zn
2+
ions; offering a cheap option for primary treatment of the wastewater effluent
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