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Sökning: WFRF:(Wolff D) > (2010-2014) > (2014)

  • Resultat 1-6 av 6
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  • Ackermann, M., et al. (författare)
  • Fermi establishes classical novae as a distinct class of gamma-ray sources
  • 2014
  • Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 345:6196, s. 554-558
  • Tidskriftsartikel (refereegranskat)abstract
    • A classical nova results from runaway thermonuclear explosions on the surface of a white dwarf that accretes matter from a low-mass main-sequence stellar companion. In 2012 and 2013, three novae were detected in gamma rays and stood in contrast to the first gamma-ray-detected nova V407 Cygni 2010, which belongs to a rare class of symbiotic binary systems. Despite likely differences in the compositions and masses of their white dwarf progenitors, the three classical novae are similarly characterized as soft-spectrum transient gamma-ray sources detected over 2- to 3-week durations. The gamma-ray detections point to unexpected high-energy particle acceleration processes linked to the mass ejection from thermonuclear explosions in an unanticipated class of Galactic gamma-ray sources.
  • Müller, Ulrich, et al. (författare)
  • Optimization of final plate flatness by set-up coordination for subsequent manufacturing processes
  • 2014
  • Ingår i: Stahl und Eisen (1881). - : Verlag Stahleisen GmbH. - 0340-4803. ; 134:5, s. 41-51
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this project was the development and implementation of the "Global Through-process Flatness Predictor and Coordinated Optimizer". This system should integrate all sub models including models of transfer conditions from process stage to process stage and perform a line-through process flatness prediction. However, analyses of the gained plate flatness in the various process routes showed that the reduction/evolution of flatness defects is nearly independent from the considered process route. Furthermore it has to be confirmed that flatness defects are not passed through the processing chain.
  • Poulopoulos, P., et al. (författare)
  • Induced spin-polarization of EuS at room temperature in Ni/EuS multilayers
  • 2014
  • Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 104:11, s. 112411-
  • Tidskriftsartikel (refereegranskat)abstract
    • Ni/EuS multilayers with excellent multilayer sequencing are deposited via e-beam evaporation on the native oxide of Si(100) wafers at 4 x 10(-9) millibars. The samples have very small surface and interface roughness and show sharp interfaces. Ni layers are nanocrystalline 4-8 nm thick and EuS layers are 2-4 nm thick and are either amorphous or nanocrystalline. Unlike for Co/EuS multilayers, all Eu ions are in divalent (ferromagnetic) state. We show a direct antiferromagnetic coupling between EuS and Ni layers. At room temperature, the EuS layers are spin-polarized due to the proximity of Ni. Therefore, Ni/EuS is a candidate for room-temperature spintronics applications. (C) 2014 AIP Publishing LLC.
  • Wolff, D., et al. (författare)
  • Creating audio based experiments as social Web games with the CASimIR framework
  • 2014
  • Ingår i: Proceedings of the AES International Conference. - 9781632662842 ; , s. 288-297
  • Konferensbidrag (refereegranskat)abstract
    • This article presents the CASimIR framework for online experiments, its use for creating a music audio game, and initial results and analyses of the collected data. Gathering user data is essential to understand the semantics of music audio and CASimIR is a new open framework for creating games with a purpose and surveys to collect user data in the Web and social networks. Its design facilitates collaborative data annotation in dynamic environments by providing modules for managing media and annotation data, as well as functionality for creating and running online real-time multi-player games. Technical benefits of the extensible framework as well as its cost effectiveness are discussed. As a case-study, we present its use in Spot The Odd Song Out, a multi-player game for collecting annotations on musical similarity and rhythm and we analyse the quantity and quality of data obtained to date with this game. The results and lessons for future data collection projects in the context of shared and linked data are discussed.
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  • Resultat 1-6 av 6

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