Werner Fischer

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The primary attachment to polymer surfaces followed by accumulation in multilayered cell clusters leads to biofilm production of Staphylococcus epidermidis, which is thought to contribute to virulence in biomaterial-related infections. We purified a specific polysaccharide antigen of biofilm-producing S. epidermidis 1457 and RP62A, which was recently shown(More)
A detailed mathematical proof is given that the energy spectrum of a quantum particle in multi-dimensional Euclidean space under the influence of certain random potentials is pure point at sufficiently low energies. The results apply in particular to an important class of Gaussian random potentials, which are homogeneous with respect to Euclidean(More)
Orientation columns in the visual cortex of cat and monkey were originally defined as small areas where all cells from layer 2 to 6 had the same preferred stimulus orientation. Large variation in preferred orientation, occasionally observed, were interpreted as biological scatter or artefacts. In contrast to this view, recent experiments revealed frequent(More)
Load commutated inverters (LCI) cover a large variety of industry applications in a power range up to 100 MW. The paper discusses realized applications in power generation, oil and gas, marine drives, and metal industry. A new LCI family with a high grade of modularity allows covering all these applications with a minimum of different parts. The heart of(More)
The functional–analytic versus the functional–integral approach to quantum Hamiltonians: The one–dimensional hydrogen atom * Abstract The capabilities of the functional–analytic and of the functional–integral approach for the construction of the Hamiltonian as a self–adjoint operator on Hilbert space are compared in the context of non–relativistic quantum(More)
Virtualization techniques are getting more and more popular. They allow to run multiple virtual servers on a single physical machine. But in case of a hardware outage, tens of virtual servers are down. This paper gives some insight how to prevent this situation. " Problems of virtualization " discusses why it is necessary to think about clustering in(More)
Alle Rechte vorbehalten ii Erklärung Hiermit erkläre ich an Eides statt, dass ich die vorliegende Arbeit selbst-ständig und ohne fremde Hilfe verfasst, andere als die angegebenen Quellen und Hilfsmittel nicht benutzt und die aus anderen Quellen entnommenen Stellen als solche gekennzeichnet habe. Contents Erklärung iii Preface viii Kurzfassung ix Abstract x(More)
Exact results are derived on the averaged dynamics of a class of random quantum-dynamical systems in continuous space. Each member of the class is characterized by a Hamiltonian which is the sum of two parts. While one part is deterministic, time-independent and quadratic, the Weyl-Wigner symbol of the other part is a homogeneous Gaussian random field which(More)
The transfer function of the outer ear in humans was determined by using the impulse technique. Signals were delivered from 325 or 393 positions on an imaginary sphere surrounding the experimental subject. Changes of sound pressure level in the ear canal show that certain frequency bands are amplified maximally if they impinge onto the ear from certain(More)