2,454 research outputs found
Equivalent-Layer Method for Optical Waveguides with a Multi-Quantum-Well Structure
An equivalent-layer method for analyzing multiple-quantum-well (MQW) waveguides is presented. This method not only allows the whole waveguide to be treated as a three-layer waveguide but offers exact solutions for the propagation constant of MQW waveguides and the power confinement factor within the MQW structure as well. A comparison between this method and two other three-layer models is given
The traveling-wave V-antenna
Combination resonant V-antenna and traveling-wave dipole antenn
Analyzing eta' photoproduction data on the proton at energies of 1.5--2.3 GeV
The recent high-precision data for the reaction at
photon energies in the range 1.5--2.3 GeV obtained by the CLAS collaboration at
the Jefferson Laboratory have been analyzed within an extended version of the
photoproduction model developed previously by the authors based on a
relativistic meson-exchange model of hadronic interactions [Phys. Rev. C
\textbf{69}, 065212 (2004)]. The photoproduction can be described quite
well over the entire energy range of available data by considering ,
, , and resonances, in addition to the -channel
mesonic currents. The observed angular distribution is due to the interference
between the -channel and the nucleon - and -channel resonance
contributions. The resonances are required to reproduce some of the
details of the measured angular distribution. For the resonances considered,
our analysis yields mass values compatible with those advocated by the Particle
Data Group. We emphasize, however, that cross-section data alone are unable to
pin down the resonance parameters and it is shown that the beam and/or target
asymmetries impose more stringent constraints on these parameter values. It is
found that the nucleonic current is relatively small and that the
coupling constant is not expected to be much larger than 2.Comment: Revised version based on revised (finalized) CLAS data (14 pages, 10
figures, RevTeX4
Experimental studies of the traveling-wave v- antenna and related antennas
Traveling wave V-antenna - effect on radiation pattern and V-antennas with more than one set of resistors and arm
Stochastic Process Associated with Traveling Wave Solutions of the Sine-Gordon Equation
Stochastic processes associated with traveling wave solutions of the
sine-Gordon equation are presented. The structure of the forward Kolmogorov
equation as a conservation law is essential in the construction and so is the
traveling wave structure. The derived stochastic processes are analyzed
numerically. An interpretation of the behaviors of the stochastic processes is
given in terms of the equation of motion.Comment: 12 pages, 9 figures; corrected typo
Comment on "Valence QCD: Connecting QCD to the Quark Model"
I criticize certain conclusions about the physics of hadrons drawn from a
"valence QCD" approximation to QCD.Comment: 12 pages, 8 figures; some minor improvements made to the tex
Exclusive production in proton-proton collisions in the resonance model
The exclusive meson production in proton-proton reactions is
calculated within the resonance model. The considered model was already
successfully applied to the description of , , , ,
production in proton-proton collisions. The only new parameter
entering into the model is the mixing angle which
is taken equal to .Comment: 7 pages, 1 figure, to appear in the brief report section of PR
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