13,049 research outputs found
SBML Level 3 Package Proposal: Flux
This document describes an easy to implement package for storing information related 
to flux balance analysis of SBML Level 3 models (the FBA package). In addition, 
we provide an example of how this package may be implemented and used as a SBML
Level 2 annotation
Black hole singularities: a new critical phenomenon
The singularitiy inside a spherical charged black hole, coupled to a
spherical, massless scalar field is studied numerically. The profile of the
characteristic scalar field was taken to be a power of advanced time with an
exponent . A critical exponent exists. For
exponents below the critical one () the singularity
is a union of spacelike and null sectors, as is also the case for data with
compact support. For exponents greater than the critical one
() an all-encompassing, spacelike singularity
evolves, which completely blocks the ``tunnel'' inside the black hole,
preventing the use of the black hole as a portal for hyperspace travel.Comment: 4 pages, 5 eps figures; An Erratum is added. The main conclusions of
the original Letter are unchange
Delta-Interference of Two Friedel Resonances
When a single resonator is coupled to a continuous spectrum one obtains a
resonance of finite half-width. Such a resonance is known in many fields of
physics. The Friedel resonance is an example where a d-impurity is dissolved in
a simple metal. If two resonators are coupled to the continuous spectrum the
resonances interfere. For identical coupling and frequencies one obtains two
effective resonances. The effective coupling of one of them to the continuum
can be tuned to zero yielding a delta-like resonance
The Superconducting Proximity Effect as a Tool to Investigate Metal Films and Interfaces
052The superconducting
proximity effect is measured in sandwiches of thin Pb films and the alkali
metals Cs, Rb, K and Na. The -dependence provides information about the
interface barriers between Pb and the alkalis. Such a barrier is particularly
large in Pb/Cs sandwiches. It is not due to impurities or oxydation. In the
presence of a sufficiently strong barrier a special form of the Cooper limit
can be applied to calculate the transition temperature of the sandwich
The Conductance of a Perfect Thin Film with Diffuse Surface Scattering
The conductance of thin films with diffusive surface scattering was solved
semi-classically by Fuchs and Sondheimer. However, when the intrinsic electron
mean free path is very large or infinite their conductance diverges. In this
letter a simple diffraction picture is presented. It yields a conductance which
corresponds to a limiting mean free path. PACS: 73.50.-h, 73.50.Bk, 73.23.-b,
73.25.+i, B14
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