Bernhard Haindl

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— 1 In this paper 2 , we introduce the B-VHF project which is funded by the European Commission and has started in January 2004. The prime goal of the B-VHF project is to verify the feasibility of broadband VHF aeronautical communications system based on multi-carrier technology and to demonstrate its benefits to the aeronautical community. The project(More)
—The maximum principle is the most important property of solutions to diffusion equations. Violation of the maximum principle by the applied discretization scheme is the cause for severe numerical instabilities: the emergence of negative concentrations and, in the nonlinear case, the deterioration of the convergence of the Newton iteration. We compare(More)
This paper describes several deployment concepts including the transition strategies starting from the existing VHF systems to a fully deployed B-VHF system. It presents the main constrains, which affect different migration strategies. The B-VHF project deals with the investigation, design, and evaluation of a broadband overlay communications system for(More)
In this paper we describe an European initiative aiming to establish a broadband Very High Frequency (VHF) aeronautical communications system based on a multi-carrier technology and demonstrate its benefits to the aeronautical community, together with its technological fundamentals. The European research project B-VHF (" Broadband VHF Aeronautical(More)
Three simple mesh examples are presented to show that neither Delaunay nor strictly non-obtuse mesh elements are required for a finite element diffusion computation. Mesh requirements based on a recently found condition are investigated to guarantee certain properties of the resulting stiffness matrix. The experiments are conducted using the general purpose(More)
The occurrence of unphysical negative concentrations in solutions to diffusion equations is a well known and severe problem. Especially in three dimensions finite element discretizations give qualitatively very poor results, while finite volume discretizations are much more stable. We investigate the cause of these instabilities and trace them back to(More)
— For wafer sizes in state-of-the-art semiconductor manufacturing ranging up to 300 mm, the uniformity of processes across the wafer becomes a very important issue. We present a fully three-dimensional model for the feature scale simulation of continuum transport and reaction determined high-pressure chemical vapor deposition processes suitable for the(More)
Three simple mesh examples are presented to show that neither Delaunay nor strictly non-obtuse mesh elements are required for a nite element computation. Mesh requirements based on a recent condition given in literature are investigated to guarantee certain properties of the resulting stiiness matrix. The experiments are conducted using a general nite(More)
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