Vienna, Austria, Austria

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Institut für Betriebswirtschaftslehre
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    ABSTRACT: The complete Cd-Gd equilibrium phase diagram was investigated by a combination of powder-XRD, SEM and DTA. All previously reported phases, i.e. CdGd, Cd2Gd, Cd3Gd, Cd45Gd11, Cd58Gd13, and Cd6Gd, could be confirmed. In addition, a new intermetallic compound with a stoichiometric composition corresponding to “Cd8Gd” was found to exist. It was obtained that “Cd8Gd” decomposes peritectically at 465 °C. Homogeneity ranges of all intermetallic compounds were determined at distinct temperatures. In addition, the maximum solubilities of Cd in the low- and high-temperature modifications of Gd were determined precisely as 4.6 and 22.6 at.%, respectively. All invariant reaction temperatures (with the exception of the formation of Cd58Gd13) as well as liquidus temperatures were determined, Most probably, Cd58Gd13 is formed in a peritectoid reaction from Cd45Gd11 and Cd6Gd at a temperature below 700 °C.
    Journal of Alloys and Compounds 12/2014;
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    ABSTRACT: In January 2014, the new ITU-T P.913 recommendation for measuring subjective video, audio and multimedia quality in any environment has been published. This document does not contain any time-continuous subjective method. However, environmental parameter values are changing continuously in a majority of outdoor and also most indoor environments. To be aware of their impact on the perceived quality, a time-continuous quality assessment methodology is necessary. In previous standards, targeting laboratory-based test settings, a desk-mounted slider of substantial size is recommended. Unfortunately, there are many environments where such a device cannot be used. In this paper, new feedback tools for mobile time-continuous rating are presented and analysed. We developed several alternatives to the generally adopted desk-mounted slider as a rating device. In order to compare the tools, we defined a number of performance measures than can be used in further studies. The suitability and efficacy of the rating scheme based on measurable parameters as well as user opinions is compared. One method, the finger count, seems to outperform the others from all points of view. It was been judged to be easy to use with low potential for distractions. Furthermore, it reaches a similar precision level as the slider, while requiring lower user reaction and scoring times. Low reaction times are particularly important for time-continuous quality assessment, where the reliability of a mapping between impairments and user ratings plays an essential role.
    Signal Processing Image Communication 10/2014;
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    ABSTRACT: We study n×nn×n completely positive matrices MM on the boundary of the completely positive cone, namely those orthogonal to a copositive matrix SS which generates a quadratic form with finitely many zeroes in the standard simplex. Constructing particular instances of SS, we are able to construct counterexamples to the famous Drew–Johnson–Loewy conjecture (1994) for matrices of order seven through eleven.
    Linear Algebra and its Applications 10/2014; 459:208–221.


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    Währinger Straße 17, 1090, Vienna, Austria, Austria
  • Head of Institution
    Ivo L. Hofacker
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Nachrichten des entomologischen Vereins Apollo Frankfurt. 01/1995; 16(1):1-12.
Journal of Comparative Psychology 10/1994; 108(3):233-42.

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