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Brau, F. (author), Luque, A. (author), Meulenbroek, B. (author), Ebert, U. (author), Schäfer, L. (author)Starting from the minimal model for the electrically interacting densities of electrons and ions in negative streamer discharges, we derive a moving boundary approximation for the ionization fronts. Solutions of the moving boundary model have already been discussed, but the derivation of the model was postponed to the present paper. The key...journal article 2008
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Groenevelt, W. (author)Big q-Jacobi functions are eigenfunctions of a second-order q-difference operator L. We study L as an unbounded self-adjoint operator on an L-2-space of functions on R with a discrete measure. We describe explicitly the spectral decomposition of L using an integral transform F with two different big q-Jacobi functions as a kernel, and we...journal article 2008
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- Beelaerts van Blokland, W.W.A. (author), Fiksinski, M.A. (author), Amoa, S.O.B. (author), Santema, S.C. (author) conference paper 2008
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- Beelaerts van Blokland, W.W.A. (author), Verhagen, W.J.C. (author), Santema, S.C. (author) journal article 2008
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de Vries, JC (author), de Jonge, H. (author), van der Voordt, Theo (author)Background: Real estate is increasingly used as a source of improving the performance of organisations by an improved image, cost reductions, increased employee satisfaction and increased labour productivity. A clear conceptual framework and standardised Key Performance Indicators (KPIs) are needed to understand and monitor the effects of real...journal article 2008
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- Van Neerven, J.M.A.M. (author), Veraar, M.C. (author), Weis, L. (author) conference paper 2007
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- Van Neerven, J. (author) journal article 2007
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Taebi, B. (author), Kloosterman, J.L. (author)AbstractThis paper approaches the choice between the open and closed nuclear fuel cycles as a matter of intergenerational justice, by revealing the value conflicts in the production of nuclear energy. The closed fuel cycle improve sustainability in terms of the supply certainty of uranium and involves less long-term radiological risks and...journal article 2007
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Simons, L.P.A. (author)The rise of Internet commerce led to multiple predictions of disintermediation and the decline of physical shopping. However, a "click and mortar" approach, which combines online, offline and telephone contact, has added value for customers and for supplier profitability, as recent research confirms. Our research objective was to help...doctoral thesis 2006
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Ten Thije Boonkkamp, J.H.M. (author), Rook, R. (author), Mattheij, R.M.M. (author)We have developed a numerical simulation code for laminar premixed flames, based on the isobaric model. The main numerical techniques employed are: the finite volume method in combination with an exponential flux approximation scheme for space discretisation, a pressure-correction (PC) method to decouple the computation of the velocity and...conference paper 2006
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Javierre, E. (author), Vuik, C. (author), Vermolen, F.J. (author), Segal, A. (author), Van der Zwaag, S. (author)In thermal processing of alloys, homogenization of the as-cast microstructure by annealing at such a high temperature that unwanted precipitates are fully dissolved, is required to obtain a microstructure suited to undergo heavy plastic deformation. This process is governed by Fickian diffusion and can be modelled as a Stefan problem. In binary...conference paper 2006
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Javierre, E. (author), Vuik, C. (author), Vermolen, F.J. (author), Segal, A. (author), Van der Zwaag, S. (author)In thermal processing of alloys, homogenization of the as-cast microstructure by annealing at such a high temperature that unwanted precipitates are fully dissolved, is required to obtain a microstructure suited to undergo heavy plastic deformation. This process is governed by Fickian diffusion and can be modelled as a Stefan problem. In binary...conference paper 2006
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Weiland, S. (author), Van Belzen, F. (author)This paper considers the problem of optimal rank approximation of multilinear functions. A new notion of singular values is introduced for an arbitrary tensor and it is shown how optimal lower rank approximations of a tensor can be inferred from these singular values, without resorting to orthogonal tensor decompositions. The results in this...conference paper 2006
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Van Gijzen, M.B. (author), Erlangga, Y.A. (author)By combining element-by-element estimates for the field of values of a preconditioned matrix with GMRES-convergence estimates it is possible to derive an easily computable upper bound on the GMRES-residual norm. This method can be applied to general finite element systems, but the preconditioner has to be Hermitian and positive definite. The...conference paper 2006
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Van Gijzen, M.B. (author), Erlangga, Y.A. (author)By combining element-by-element estimates for the field of values of a preconditioned matrix with GMRES-convergence estimates it is possible to derive an easily computable upper bound on the GMRES-residual norm. This method can be applied to general finite element systems, but the preconditioner has to be Hermitian and positive definite. The...conference paper 2006
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- Straub, A. (author) conference paper 2006
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Huang, X. (author), Oosterlee, C.W. (author), van der Weide, J.A.M. (author)This paper utilizes the saddlepoint approximation as an efficient tool to estimate the portfolio credit loss distribution in the Vasicek model. Value at Risk (VaR), the risk measure chosen in the Basel II Accord for the evaluation of capital requirement, can then be found by inverting the loss distribution. VaR Contribution (VaRC), Expected...report 2006
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Van de Kar, E.A.M. (author)The mobile telecommunications industry is searching for new services, not only to recoup its investments but also to stay competitive in the future. The industry is undergoing a radical transformation and organisations in the telecommunications, information technology and media sector are becoming increasingly interdependent. Organisations have...doctoral thesis 2004
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- Muller, J.A. (author), Moerman, M.J. (author), Pijpers, J.J.H. (author), Tummers, S.W. (author) report 2004
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De Wolf, P.P. (author), Lopuhaa, H.P. (author), Groeneboom, P. (author)A large part of the theory of extreme value index estimation is developed for positive extreme value indices. The best-known estimator of a positive extreme value index is probably the Hill estimator. This estimator belongs to the category of moment estimators, but can also be interpreted as a quasi-maximum likelihood estimator. It has been...journal article 2003