1,321 research outputs found
From Regge Behavior to DGLAP Evolution
We study the interface between Regge behavior and DGLAP evolution in a
non-perturbative model for the nucleon structure function based on a multipole
pomeron exchange. This model provides the input for a subsequent DGLAP
evolution that we calculate numerically. The soft input and its evolution give
a good fit to the experimental data in the whole available range of x and Q^2.Comment: 7 pages, LaTeX, 4 figures. Text improved and reduced, figures
modified, references updated. To be published in Eur. Phys. J. C in the
present for
A Kinematically Complete Analysis of the CLAS data on the Proton Structure Function in a Regge-Dual model
The recently measured inclusive electron-proton cross section in the nucleon
resonance region, performed with the CLAS detector at the Thomas Jefferson
Laboratory, has provided new data for the nucleon structure function with
previously unavailable precision. In this paper we propose a description of
these experimental data based on a Regge-dual model for . The basic inputs
in the model are nonlinear complex Regge trajectories producing both isobar
resonances and a smooth background. The model is tested against the
experimental data, and the dependence of the moments is calculated. The
fitted model for the structure function (inclusive cross section) is a limiting
case of the more general scattering amplitude equally applicable to deeply
virtual Compton scattering (DVCS). The connection between the two is discussed.Comment: 21 pages, 12 figures, revtex style. Misprints in eqs. (15,17) are
corrected. To appear in Phys. Rev.
The Analysis of a Vortex Type Magnetohydrodynamic Induction Generator
Consideration it is given to the performance to the characteristics of an AC magnetohydrodynamic power generator, A rotating magnetic field is imposed on the vortex flow of an electrically conducting fluid, which is injected tangentially into an annulus formed by two nonconducting concentric cylinders and two nonconducting end plates. A perturbation technique is used to determine the two dimensional velocity and three dimensional electromagnetic field and current distributions. Finally, the generated power, the ohmic losses, the effective power and the electrical efficiency of the converter system are calculated
Fundamental and harmonic emission in interplanetary type 2 radio bursts
Three interplanetary type II radio bursts which show two prominent and long duration bands in their dynamic spectra were analyzed in detail and compared to similar bands in meter wavelength type II events. These bands, which differ by a factor of about two in frequency, were interpreted in terms of fundamental and harmonic emission. The fundamental component has a greater average intensity than the harmonic, due largely to short intense brightenings. The fundamental spectral profile is more narrow than that of the harmonic, with harmonic band typically exhibiting a larger bandwidth to frequency ratio than the fundamental by a factor of two. The fundamental has a larger source size than the harmonic, 160 degrees versus 110 degrees, on average, as viewed from the Sun. Two of the events have source positions which correlate well with the associated flare positions
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