PATTERN RECOGNITION IN MAINTAINING RELIABILITY

In the paper a feedback control scheme for running and maintenance of industrial equipments is developed, where only input and output signals of the control loop are observable, the actual state of the system will be estimated from the output signals using pattern recognition. Technical and statistical expertise in the control loop are separated, therefore appropriate statistical tools and problems (classification, feature extraction, life statistics) can be individually accessed. The phenomenon of aging is modelled by random transitions among parameter classes with different failure rates. Optimization is reduced to a Markovian decision process. Concrete technical examples illustrate the relevance of the model

CLOSE-PACKED FRANK-KASPER COORDINATION AND HIGH CRITICAL TEMPERATURE SUPERCONDUCTIVITY

It has been proposed that a relation exists between close packed Frank-Kasper co-ordination in the layers containing Cu-O planes and high-Tc superconductivity. The origin of the superconductivity in perovskite-type materials is attributed in part to a three dimensional nesting of the Fermi-surface with the boundary of Jones-zone, causing 'partially-gapped' Fermi surface and to a gliding charge density wave arising from a three-dimensional 'breathing' of distorted perovskite structures associated with close-packed seeking symmetry

Characterization of the nitrogen split interstitial defect in wurtzite aluminum nitride using density functional theory

We carried out Heyd-Scuseria-Ernzerhof hybrid density functional theory plane wave supercell calculations in wurtzite aluminum nitride in order to characterize the geometry, formation energies, transition levels and hyperfine tensors of the nitrogen split interstitial defect. The calculated hyperfine tensors may provide useful fingerprint of this defect for electron paramagnetic resonance measurement.Comment: 5 pages, 3 figure

Gyakorlóiskola (1914) 6

Magyar Tanítóképző A Tanítóképző-intézeti Tanárok Országos Egyesületének közlönye - melléklet 29. évfolyam Budapest, 1914. június h

Rotation sets of billiards with one obstacle

We investigate the rotation sets of billiards on the $m$-dimensional torus with one small convex obstacle and in the square with one small convex obstacle. In the first case the displacement function, whose averages we consider, measures the change of the position of a point in the universal covering of the torus (that is, in the Euclidean space), in the second case it measures the rotation around the obstacle. A substantial part of the rotation set has usual strong properties of rotation sets