New results for the exclusive and quasi-free cross sections off neutrons bound in deuterium \({\gamma}_vn(p) \rightarrow p{\pi}^{-} (p)\) are presented over a wide final state hadron angle range with ...a kinematic coverage of the invariant mass (\(W\)) up to 1.825 GeV and the virtual photon four-momentum transfer squared (\(Q^{2}\)) from 0.4 to 1.0 GeV\(^2\). The exclusive structure functions were extracted and their Legendre moments were obtained. Final-state-interaction contributions have been kinematically separated from the extracted quasi-free cross sections off bound neutrons solely based on the analysis of the experimental data. These new results will serve as long-awaited input for phenomenological analyses to extract the \(Q^{2}\) evolution of previously unavailable \(n \to N^{*}\) electroexcitation amplitudes and to improve state-of-the-art models of neutrino scattering off nuclei by augmenting the already available results from free protons.
Multicast services have been used for many years to transmit multimedia data to large receiver groups. However, only recently have counterpart network services been introduced that provide similar ...scalability and anonymity in the opposite direction (i.e., messages from a group of senders destined for a common receiver). In this paper, we explore how these emerging services, specifically a concast service (many-to-one communication service), can be used to improve the scalability and performance of multimedia applications. In particular, we show how such services can be used in both the control and data planes to overcome well-known scalability problems (e.g., with RTP) that are difficult to solve effectively with end-system approaches alone. We validate our solutions by presenting experimental results taken from prototype video and audio applications we designed and implemented. Our initial results show a reduction of as much as two orders of magnitude in packet loss rates using these generic services.
Biphasic radiography was compared with fiberoptic endoscopy in detecting gastric erosions in a prospective, blinded study of 385 patients with dyspepsia. Because no absolute standard was available ...for the comparison, since histologic confirmation of all erosions was not possible, the kappa statistic was used to compare results from both modalities. Flat (incomplete) erosions were detected with endoscopy only and were considered to be present in 42 patients (11.2%). Varioliform (complete) erosions were identified with both radiography and endoscopy in 12 patients (3.2%). For the detection of varioliform erosions, a substantial agreement beyond chance between both modalities was found (kappa = 0.73; standard error, 0.12). Thus, flat erosions were detected with endoscopy only, whereas state-of-the-art radiography and endoscopy were equally sensitive for detecting varioliform erosions. Histologic confirmation of erosions was obtained in only 75% of the patients. It is unknown whether the demonstration of erosions with radiography and/or endoscopy correlates with dyspepsia.
Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star ...equation of state (EOS). Yet, compared to other elastic scattering processes, there is very little data on \(\Lambda\)-\(N\) scattering. This experiment utilized the CLAS detector to study the \(\Lambda p \rightarrow \Lambda p\) elastic scattering cross section in the incident \(\Lambda\) momentum range 0.9-2.0 GeV/c. This is the first data on this reaction in several decades. The new cross sections have significantly better accuracy and precision than the existing world data, and the techniques developed here can also be used in future experiments.
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