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  • 1. Berumen, S. A.
    et al.
    Pérez-Megino, L. P.
    KTH, Skolan för industriell teknik och management (ITM), Industriell ekonomi och organisation (Inst.).
    Socioeconomic ranking for the development of coal-mining regions in Europe2016Inngår i: Revista de Métodos Cuantitativos para la Economía y la Empresa, ISSN 1886-516X, Vol. 21, nr 1, s. 39-57Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The socioeconomic situation of European coalfields is highly heterogeneous. On the one hand, successful examples comprise regions that long ago embraced internationalization, innovation and/or restructuring strategies. In those regions where the aforementioned strategies were fruitful, the development of new production methods led to gradual repopulation. Less successful examples, however, are likely to experience undesired effects as a consequence of both the suppression of aid (EU- and regional- level) and the liberalization of EU mining markets, starting on December 31, 2018. This papers aims to provide a method to accurately assess the socioeconomic situation of these regions. As such a method is rooted in previous policies, it enables the identification of welfare-enhancing policies for the inhabitants of European coalfield regions.

  • 2.
    Lindquist, A.
    et al.
    KTH. Shanghai Jiao Tong University, China.
    Picci, G.
    Modeling of stationary periodic time series by ARMA representations2016Inngår i: Springer Optimization and Its Applications, Springer, 2016, s. 281-314Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This is a survey of some recent results on the rational circulant covariance extension problem: Given a partial sequence (c0; c1;:::; cn) of covariance lags ck D E{y(t+k)y(t)} emanating from a stationary periodic process {y.(t)} with period 2N > 2n,find all possible rational spectral functions of {y.(t)} of degree at most 2n or,equivalently,all bilateral and unilateral ARMA models of order at most n,having this partial covariance sequence. Each representation is obtained as the solution of a pair of dual convex optimization problems. This theory is then reformulated in terms of circulant matrices and the connections to reciprocal processes and the covariance selection problem is explained. Next it is shown how the theory can be extended to the multivariate case. Finally,an application to image processing is presented.

  • 3. Ord, Teet
    et al.
    Rago, Kullike
    Vargunin, Artjom
    Surface Effect on Spatial Length-Scales in a Two-Gap Superconductor2016Inngår i: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, ISSN 1557-1939, Vol. 29, nr 12, s. 3087-3091Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The healing of two-band superconductivity near its interface is studied. It is demonstrated that the restoration of superconductivity gaps in the immediate vicinity of the interface is governed by two length scales: the first one diverges at critical temperature T (c) , while the second one diverges at T (c+)< T (c) . By moving away from the boundary, the temperature dependencies of characteristic lengths change so that singularity at T (c+) becomes removed in the bulk by arbitrary weak interband coupling. The asymptotes for the spatial behavior of gaps have been found analytically near the surface and approaching the bulk state.

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