139,014 research outputs found
New line-interactive UPS system with DSP-based active power-line conditioning
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Antideuteron production in proton-proton and proton-nucleus collisions
The experimental data of the antideuteron production in proton-proton and
proton-nucleus collisions are analyzed within a simple model based on the
diagrammatic approach to the coalescence model. This model is shown to be able
to reproduce most of existing data without any additional parameter.Comment: To appear in Eur. Phys. J A (2002
Geometric coupling thresholds in a two-dimensional strip
We consider the Laplacian in a strip with the
boundary condition which is Dirichlet except at the segment of a length of
one of the boundaries where it is switched to Neumann. This operator is known
to have a non-empty and simple discrete spectrum for any . There is a
sequence of critical values at which new eigenvalues emerge
from the continuum when the Neumann window expands. We find the asymptotic
behavior of these eigenvalues around the thresholds showing that the gap is in
the leading order proportional to with an explicit coefficient
expressed in terms of the corresponding threshold-energy resonance
eigenfunction
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