462 research outputs found
Schmidt, Ludwig (Hrsg.): Kleine Predigttypologie. Band III: Das Neue Testament. - Stuttgart: Klotz, 1965
On the Short-Time Compositional Stability of Periodic Multilayers
The short-time stability of concentration profiles in coherent periodic
multilayers consisting of two components with large miscibility gap is
investigated by analysing stationary solutions of the Cahn-Hilliard diffusion
equation. The limits of the existence and stability of periodic concentration
profiles are discussed as a function of the average composition for given
multilayer period length. The minimal average composition and the corresponding
layer thickness below which artificially prepared layers dissolve at elevated
temperatures are calculated as a function of the multilayer period length for a
special model of the composition dependence of the Gibbs free energy. For
period lengths exceeding a critical value, layered structures can exist as
metastable states in a certain region of the average composition. The phase
composition in very thin individual layers, comparable with the interphase
boundary width, deviates from that of the corresponding bulk phase.Comment: 29 pages including 7 figures, to be published in Thin Solid Film
Caractérisation expérimentale de l'endommagement dans les minicomposites SiC/SiC
National audienceLes composites SiC/SiC sont Ă©tudiĂ©s pour leur usage potentiel comme matĂ©riau de gainage dans les rĂ©acteurs nuclĂ©aires de gĂ©nĂ©ration future. Afin de valider un modĂšle multiĂ©chelle d'endommagement Ă l'Ă©chelle microscopique, une caractĂ©risation expĂ©rimentale de l'endommagement Ă l'Ă©chelle du toron est mise en Ćuvre. Des essais de traction in-situ sur minicomposite permettent d'obtenir des donnĂ©es statistiques sur la cinĂ©tique d'apparition des fissures matricielles et l'Ă©volution de leur ouverture en fonction de la contrainte. Ces observations de surface sont complĂ©tĂ©es par des observations microtomographiques rĂ©alisĂ©es Ă l'ESRF sur un minicomposite en traction. L'analyse des images 3D permet alors d'Ă©tudier la propagation des fissures matricielles au sein du minicomposite. Les ruptures de fibres sont Ă©galement observables grĂące Ă cette technique d'observation
BCG Induced Necrosis of the Entire Bladder Urothelium
AbstractInstillation therapy with attenuated tuberculosis bacteria (BCG) can significantly reduce rates of recurrence of non-muscle invasive bladder cancer. Local and systemic side effects such as dysuria, irritative voiding symptoms or partial bladder contracture and systemic inflammation were reported. A 75 year-old male patient with recurrent non muscle invasive bladder cancer developed necrosis of the entire bladder urothelium more than six years after BCG instillation immunotherapy. The resulting irritative voiding symptoms and low bladder capacity required radical cystectomy. BCG instillation can cause severe side effects, which develop gradually and eventually need radical surgical therapy such as cystectomy without tumor recurrence
Inhibition of breast cancer resistance protein at the murine blood-brain barrier by Ko143 studied with [11C]tariquidar and PET
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