2,272 research outputs found
Phylogenetic Analysis of Morpho Butterflies (Nymphalidae, Morphinae): Implications for Classification and Natural History
Epidemiology of coagulase-negative staphylococci intramammary infection in dairy cattle and the effect of bacteriological culture misclassification
Phylogenetic analysis and review of Panacea and Batesia butterflies (Nymphalidae)
Phylogenetic analysis of 53 morphological characte rs for five species of Panacea and Batesia hypochlora supports the separation of the two genera and showed that the monotypic genus Batesia is basal to Panacea. Male genitalia were Ilniform within Panacea and characters inir)f)llative for phylogeny reconstruction were restricted to wing coloration. Illustrations of adults and genitalia, a brief diagnosis, and distributions are provided le)r each species
Escape Behavior of Quantum Two-Particle Systems with Coulomb Interactions
Quantum escapes of two particles with Coulomb interactions from a confined
one-dimensional region to a semi-infinite lead are discussed by the probability
of particles remaining in the confined region, i.e. the survival probability,
in comparison with one or two free particles. For free-particle systems the
survival probability decays asymptotically in power as a function of time. On
the other hand, for two-particle systems with Coulomb interactions it shows an
exponential decay in time. A difference of escape behaviors between Bosons and
Fermions is considered as quantum effects of identical two particles such as
the Pauli exclusion principle. The exponential decay in the survival
probability of interacting two particles is also discussed in a viewpoint of
quantum chaos based on a distribution of energy level spacings.Comment: 10 pages, 7 figure
Analytical approximation for the sphere-sphere Coulomb potential
A simple analytical expression, which closely approximates the Coulomb
potential between two uniformly charged spheres, is presented. This expression
can be used in the optical potential semiclassical analyses which require that
the interaction be analytic on and near the real r-axis.Comment: 4 pages including 3 figures and 1 tabl
A new approximation scheme in quantum mechanics
An approximation method which combines the perturbation theory with the
variational calculation is constructed for quantum mechanical problems. Using
the anharmonic oscillator and the He atom as examples, we show that the present
method provides an efficient scheme in estimating both the ground and the
excited states. We also discuss the limitations of the present method.Comment: 14pages, to be published in Eur. J. Phy
Interference scheme to measure light-induced nonlinearities in Bose-Einstein condensates
Light-induced nonlinear terms in the Gross-Pitaevskii equation arise from the
stimulated coherent exchange of photons between two atoms. For atoms in an
optical dipole trap this effect depends on the spatial profile of the trapping
laser beam. Two different laser beams can induce the same trapping potential
but very different nonlinearities. We propose a scheme to measure light-induced
nonlinearities which is based on this observation.Comment: 2 figure
Differences in the Pattern of Antibiotic Prescription Profile and Recurrence Rate for Possible Urinary Tract Infections in Women With and Without Diabetes
OBJECTIVEâWomen with diabetes have a high incidence and complication rate of urinary tract infections (UTIs). Our aims were to compare current treatment strategies with respect to recurrence rates in women with diabetes with those without diabetes
Relativistic and Radiative Energy Shifts for Rydberg States
We investigate relativistic and quantum electrodynamic effects for
highly-excited bound states in hydrogenlike systems (Rydberg states). In
particular, hydrogenic one-loop Bethe logarithms are calculated for all
circular states (l = n-1) in the range 20 <= n <= 60 and successfully compared
to an existing asymptotic expansion for large principal quantum number n. We
provide accurate expansions of the Bethe logarithm for large values of n, for
S, P and circular Rydberg states. These three expansions are expected to give
any Bethe logarithms for principal quantum number n > 20 to an accuracy of five
to seven decimal digits, within the specified manifolds of atomic states.
Within the numerical accuracy, the results constitute unified, general formulas
for quantum electrodynamic corrections whose validity is not restricted to a
single atomic state. The results are relevant for accurate predictions of
radiative shifts of Rydberg states and for the description of the recently
investigated laser-dressed Lamb shift, which is observable in a strong
coherent-wave light field.Comment: 8 pages; RevTeX
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