1,691 research outputs found
Playing a quantum game with a corrupted source
The quantum advantage arising in a simplified multi-player quantum game, is
found to be a disadvantage when the game's qubit-source is corrupted by a noisy
"demon". Above a critical value of the corruption-rate, or noise-level, the
coherent quantum effects impede the players to such an extent that the optimal
choice of game changes from quantum to classical.Comment: This version will appear in PRA (Rapid Comm.
REPLY: A THEORETICAL FRAMEWORK FOR ANALYZING SOCIAL COSTS OF THE TOBACCO PROGRAM
Institutional and Behavioral Economics,
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Development of Nanocomposites for Solid Freeform Fabrication
Nanocomposites in which the constituents are mixed on a nanorneter scale can
provide important advantages in the Selective Laser Sintering (SLS) and Selective Laser
Reactive Sintering (SLRS) processes. The larger surface area and grain boundaries in the
nanocolnposites compared to that in the conventional microcomposites are expected to
enhance the solid state diffusion during laser irradiation as well as during any other
subsequent processes. Our strategy is to design and develop nanocomposites in which one
nanosize cOlnponent has a lower melting point than the other nanosize component, either of
which can serve as the matrix phase. The nanoscale dispersion of the low melting
component can aid the sintering process during SLS or SLRS. Nanocomposite powders of
AI203-COOx, Ab03-NiO, A1203-CO and A1203-Ni have been synthesized by sol-gel
processing and are evaluated by SLS.Mechanical Engineerin
Socio-demographic and clinical factors predicting time to presentation for children with pneumonia in Ilorin, Nigeria
Background: Pneumonia is a major contributor to morbidity and mortality in children, and the time to presentation is a recognized contributor towards disease severity and outcome.Objectives: The current study aimed to explore the influence of some socio-demographic and clinical factors in children with pneumonia on the time to presentation at a health facility in Ilorin, North Central Nigeria.Materials and method: A prospective cross-sectional study of 167 children with pneumonia was done. The duration of the various symptoms and first presentation to a health facility was obtained. Time to presentation was categorized as 0–2 days (early), 3–5 days (intermediate) and greater than five days (late). Multinomial logistic regression analysis was used to identify significant predictors of either early or intermediate presentation compared with late presentation. A p-value of less than 0.05 was considered significant.Results: Fifty-one (30.5%) children with pneumonia had an early presentation, 73 (43.7%) had intermediate presentation and 43 (25.7%) were late in presentation. Predictors of early presentation were younger age (OR 0.96, 95%CI 0.93–0.99), higher respiratory rates (OR 1.03, 95%CI 1.01–1.06) and bronchopneumonia (OR 6.93, 95%CI 1.52–31.63). Predictors of intermediate presentation were families with few number of children (OR 0.73, 95%CI 0.57–0.92) and bronchopneumonia (OR 3.41, 95%C.I. 1.02–11.38).Conclusion: Infancy and families with few children are socio-demographic features that are likely to determine early-to-intermediate presentation of children with pneumonia while high respiratory rates and bronchopneumonia are disease related factors that predict early presentation.Keywords: Socio-demographic, Children, Pneumonia, Time to presentation, Nigeri
Asymmetry sum rule for molecular predissociation
© 2000 American Physical SocietyIn the case of weak diatomic molecular predissociation by noninteracting, optically inactive continuum states, it is demonstrated that the predissociation line shape is more accurately represented by a Beutler-Fano profile than by a Lorentzian. The weak asymmetry that is found to occur is due principally to interactions with neighboring vibrational resonances. For this type of predissociation in the case of multiple continua, a sum rule for the corresponding line-shape asymmetry is derived. This sum rule is verified numerically using single-channel and multichannel coupled Schrödinger-equation calculations for the Schumann-Runge band system of O2. Similar results are presented for the case of optically active continua.F. T. Hawes, L. W. Torop, B. R. Lewis and S. T. Gibso
Mesh update techniques for free-surface flow solvers using spectral element method
This paper presents a novel mesh-update technique for unsteady free-surface
Newtonian flows using spectral element method and relying on the arbitrary
Lagrangian--Eulerian kinematic description for moving the grid. Selected
results showing compatibility of this mesh-update technique with spectral
element method are given
Large-space shell-model calculations for light nuclei
An effective two-body interaction is constructed from a new Reid-like
potential for a large no-core space consisting of six major shells and is used
to generate the shell-model properties for light nuclei from =2 to 6. (For
practical reasons, the model space is partially truncated for =6.) Binding
energies and other physical observables are calculated and compare favorably
with experiment.Comment: prepared using LaTex, 21 manuscript pages, no figure
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