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Extensive accumulation of large woody debris at bridge piers poses a chronic and sometimes quite severe problem at several bridge crossings in Indiana. This study, involving both laboratory and field components, examines the factors contributing to the initiation and development of such debris piles. The laboratory study, performed in a rectangular channel(More)
Though MR spectroscopy has long been used to analyze the structure of organic compounds in solution, interest in applying it to the study of biologic systems has been slow in evolving because of past problems with spectral resolution in solids and gels. Renewed interest in this area has been stimulated both by the rapid growth of MR imaging as a clinical(More)
In an exclusive measurement of the reaction gammad-->K(+)K(-)pn, a narrow peak that can be attributed to an exotic baryon with strangeness S=+1 is seen in the K(+)n invariant mass spectrum. The peak is at 1.542+/-0.005 GeV/c(2) with a measured width of 0.021 GeV/c(2) FWHM, which is largely determined by experimental mass resolution. The statistical(More)
Beam-helicity asymmetries for the two-pion-photoproduction reaction gammap-->ppi(+)pi(-) have been studied for the first time in the resonance region for center-of-mass energies between 1.35 and 2.30 GeV. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged photons incident on an(More)
The reaction gamma p-->pi(+)K(-)K(+)n was studied at Jefferson Laboratory using a tagged photon beam with an energy range of 3-5.47 GeV. A narrow baryon state with strangeness S=+1 and mass M=1555+/-10 MeV/c(2) was observed in the nK(+) invariant mass spectrum. The peak's width is consistent with the CLAS resolution (FWHM=26 MeV/c(2)), and its statistical(More)
The longitudinal target-spin asymmetry AUL for the exclusive electroproduction of high-energy photons was measured for the first time in ep-->e;'pgamma. The data have been accumulated at JLab with the CLAS spectrometer using 5.7 GeV electrons and a longitudinally polarized NH3 target. A significant azimuthal angular dependence was observed, resulting from(More)
We investigate the transition from the nucleon-meson to the quark-gluon description of the strong interaction using the photon energy dependence of the d(gamma,p)n differential cross section for photon energies above 0.5 GeV and center-of-mass proton angles between 30 degrees and 150 degrees. A possible signature for this transition is the onset of(More)
The neutron elastic magnetic form factor was extracted from quasielastic electron scattering on deuterium over the range Q;{2}=1.0-4.8 GeV2 with the CLAS detector at Jefferson Lab. High precision was achieved with a ratio technique and a simultaneous in situ calibration of the neutron detection efficiency. Neutrons were detected with electromagnetic(More)
This experiment will use tagged photons (1 to 2 GeV) in the CLAS to measure the differential A (γ ,K) and A (γ ,KY) cross sections on 3 He, 4 He, and 12 C, in quasi-free kinematics. Both K + and K o , as well as Y = Λ and Σ production will be measured. These measurements complement similar CLAS experiments on H and D. We expect photo-kaon production to be(More)