The production of strange hadrons is investigated using deep-inelastic scattering events measured with the H1 detector at HERA. The K0 s and Λ production cross sections and their ratios are determined and presented differentially as functions of several kinematical variables. The K0 s production rate is compared to the production of charged particles in the same region of phase space. In additi...

The process γp → γY , in which the outgoing photon has transverse momentum pγT > 2 GeV and there is a large rapidity gap between the proton dissociative system Y and the outgoing photon, is studied, using the H1 detector at HERA, for the first time. The measurement is based on 47.6 pb−1 of data collected in the 1999– 2000 running period. Cross sections are measured differentially in the squared...

Odderon induced contributions to exclusive photoproduction of π • , f 2 (1270) and a 2 (1320) have been searched for at HERA, using the multiphoton decays of these mesons. No indication for such contributions was found, in a kinematic region defined by the average photon-proton centre-of-mass energy W = 200 − 215 GeV, photon virtual-ities Q 2 < 0.01 GeV 2 and 0.02 GeV 2 < |t| < 0.3 GeV 2 , wher...

OBJECTIVES/HYPOTHESIS This study is undertaken to determine if the presence or absence of multiseptated frontal sinuses is associated with the presence or absence of supraorbital ethmoid cells (SOECs). STUDY DESIGN Analysis of prospectively collected data. METHODS Sixty consecutive patients with chronic rhinosinusitis were identified from a prospectively collected database at a tertiary-ref...

• Predictive Accuracy Measures. These measures evaluate how close the recommender system came to predicting actual rating/utility values. • Classification Accuracy Measures. These measures evaluate the frequency with which a recommender system makes correct/incorrect decisions regarding items. • Rank Accuracy Measures. These measures evaluate the correctness of the ordering of items performed b...

The Conjugate Gradient Squared (CGS) is an iterative method for solving nonsymmetric linear systems of equations. However, during the iteration large residual norms may appear, which may lead to inaccurate approximate solutions or may even deteriorate the convergence rate. Instead of squaring the Bi-CG polynomial as in CGS, we propose to consider products of two nearby Bi-CG polynomials which l...