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889589 documents, page 1 of 88959

Updating schemes in zero-temperature single-spin flip dynamics

Krupa, Sylwia; Sznajd-Weron, Katarzyna (2008)
In this paper we examine the role of the so called $c$-parallel updating schemes in relaxation from disordered states to the final ferromagnetic steady state. We investigate two zero-temperature single-spin flip dynamics on a one dimensional lattice of length $L$: inflow (i.e. generalized zero-temperature Glauber dynamics) and outflow opinion dynamics. The varying $c$ allows us to change the updating scheme from random sequential updating ($c=1/L$) to deterministic synchronous updating (for $...

ACCESS – a NASA mission concept study of an Actively-Corrected Coronagraph for Exoplanet System Studies

Trauger, John; Stapelfeldt, Karl; Traub, Wesley; Henry, Curt; Krist, John; Mawet, Dimitri; Moody, Dwight; Park, Peggy; Pueyo, Laurent; Serabyn, Eugene; Shaklan, Stuart (2008)
ACCESS (Actively-Corrected Coronagraph for Exoplanet System Studies) develops the science and engineering case for an investigation of exosolar giant planets, super-earths, exo-earths, and dust/debris fields that would be accessible to a medium-scale NASA mission. The study begins with the observation that coronagraph architectures of all types (other than the external occulter) call for an exceptionally stable telescope and spacecraft, as well as active wavefront correction with one or more ...

Quantitative Performance of the Mopex Multi-Frame Outlier-Detection Algorithm

Laher, Russ; Grant, Andrew; Fang, Fan (2008)
The Mopex software is used at the Spitzer Science Center (SSC) to produce co-added and mosaicked images from sets of individually processed Spitzer images. Until now, quantitative studies of the performance of Mopex's outlier-detection methods had never been performed. This particular study focuses only on Mopex's multiframe outlier-detection algorithm, and future studies are still needed to characterize its so-called box and dual methods. The performance of the multiframe method varies with ...

On Multiple Symbol Detection for Diagonal DUSTM Over Ricean Channels

Cui, Tao; Tellambura, Chintha (2008)
This letter considers multiple symbol differential detection for multiple-antenna systems over flat Ricean-fading channels when partial channel state information (CSI) is available at the transmitter. Using the maximum likelihood (ML) principle, and assuming perfect knowledge of the channel mean, we derive the optimal multiple symbol detection (MSD) rule for diagonal differential unitary space-time modulation (DUSTM). This rule is used to develop a sphere decoding bound intersection detector ...

An experimental study of the effect of off-fault damage on the velocity of a slip pulse

Biegel, Ronald L.; Sammis, Charles G.; Rosakis, Ares J. (2008)
The effect of off-fault damage on the speed of ruptures propagating on faults in photoelastic Homalite plates was measured using high-speed digital photography. The off-fault damage was composed of a network of fractures introduced by thermally shocking the Homalite in liquid nitrogen. The mode II rupture speed measured in damaged Homalite was significantly lower than the limiting Rayleigh speed of v_r = 0.92 v_s, even after the shear wave speed v_s was reduced to a value appropriate for the ...

Deprimerade patienters upplevelse av ECT behandling : - en systematisk litteraturstudie

olars, ulf; sik, markus (2008)
Syfte: Att undersöka patienters upplevelse av ECT-behandling. Metod: En systematisk litteraturstudie med deskriptiv ansats. Artikelsökning av både kvalitativa och kvantitativa artiklar har gjorts i fritextdatabaserna Cinahl, ELIN och Whiley interscience. Artiklar granskades enligt granskningsmallar för kvalitetsbedömning och var en modifierad version av Willman, Stoltz, Bahtsevani, (2006) och Forsberg, Wengström, (2008).Litteratur i introduktionsdelen har inhämtats enligt ett bekvämlighetsu...

Politiker und Verwaltungsmanager in der Reform - Konflikt oder Symbiose? : Eine Analyse anhand von Reformen in der Schweiz

Schedler, Kuno (2008)
Seit den neunziger Jahren wird die öffentliche Verwaltung reformiert. Nicht selten sind davon auch politische Gremien betroffen, in der Schweiz gleichzeitig die Parlamente und die Regierungen. Da sich alle drei Partner - wenn möglich harmonisch - verändern sollen, ist anzunehmen, dass die Beziehung zwischen Politikern und Verwaltungsmanagern eine besondere Bedeutung für die Reform hat. Dieser Artikel geht der Frage nach, wie Exekutivpolitiker ihre eigene Rolle in der Reform erlebten, wie sie ...

Self-evaluation test for student guidance: the case of the University of Bologna

Matteucci, Mariagiulia; Mignani, Stefania; Ricci, Roberto (2008)
In this work, the theme of student guidance in the university context is outlined. In order to introduce the competence evaluation for student guidance, a new guidance project based on self-evaluation tests of the University of Bologna (Italy) is presented. In the paper, the issues of item specification and test calibration are explored, with reference to item response theory models. Models are for multiple-choice and binary items and they assume that a single ability is responsible for the s...

François Hartog & Jacques Revel, eds, Les Usages politiques du passé

Payen, Pascal (2008)
La nouvelle collection « Enquête », créée par les éditions de l’École des hautes études en sciences sociales, a pour objectif de confronter les démarches de l’anthropologie, de la sociologie et de l’histoire. L’analyse devrait porter sur trois registres – les « partages disciplinaires », les « modes d’argumentation », les « modèles interprétatifs » – à partir desquels se recomposent de nouveaux « objets ». Dans ce premier volume, la parole est donnée aux historiens. François Hartog et Jacques...

Philosophie politique

L’ « ordre constitutionnel libéral et démocratique », cet équilibre entre liberté et responsabilité, entre intérêts particulier et collectif, entre concurrence et solidarité, entre économie et marché, qui fonde l’organisation de l’économie et de la société allemandes ne s’est pas imposé aussi naturellement qu’ont croit et ne procède en rien d’un ‘miracle politique’. La doctrine d’un Ludwig Erhard qui en est l’un des pères fondateurs, et qui se justifiait aisément dans un pays en ruines dont i...