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- ItemVerkehrsoptimierung (Traffic and Transport Optimization)(Oberwolfach-Walke : Mathematisches Forschungsinstitut Oberwolfach, 1999) Buckler Powell, Warren; Zimmermann, Uwe[no abstract available]
- ItemMathematische Stochastik (Finance and Statistics)(Oberwolfach-Walke : Mathematisches Forschungsinstitut Oberwolfach, 1999) Heath, David C.; Schweizer, Martin[no abstract available]
- ItemDesign and Analysis of Infectious Disease Studies(Oberwolfach-Walke : Mathematisches Forschungsinstitut Oberwolfach, 1999) Dietz, Klaus; Keiding, Niels[no abstract available]
- ItemSol-gel preparation of scratch-resistant AI₂O₃ coatings on float glass(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1999) Hauk, Rainer; Frischat, Günther Heinz; Ruppert, KarlGlass surfaces including those of automotive glazing show insufficient Scratch resistance. In order to improve this, a sol-gel process has been developed by means of which scratch-resistant and transparent corundum coatings (α-Αl₂O₃) may be deposited on glass surfaces. Coatings which were produced by using commercial boehmite(AlOOH) dispersions could also be completely transformed into α-Αl₂O₃, but they were not dense enough at about 500 nm thickness. Coatings produced by an alkoxide-gel process from aluminium butoxide were dense at a thickness of maximal 100 nm and adhered very well to the glass surface which had been slightly roughened by HF etching. Α Scratch test with a quartz grain showed that the damage of the glass surfaces coated in this way was less than 2 % compared to that of uncoated surfaces. Transmission of these coated glasses was about 90 % in the visible wavelength ränge.
- ItemHydrogen/lithium interdiffusion in a lithium aluminosilicate glass studied by NRA and RBS(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1999) Dersch, Oliver; Laube, Michael; Rauch, Friedrich; Becker, OtmarSamples of a lithium aluminosilicate (LAS) glass, a model glass for technical LAS glass used in the production of glass ceramics, were treated in hot sulfuric acid and analyzed using Nuclear Reaction Analysis (NRA) techniques for determining hydrogen and lithium depth profiles in the surface layer. It was found that the depth profiles of these two elements are fully complementary, showing that H⁺/Li⁺ ion exchange takes place during the treatment. As revealed by Rutherford Backscattering Spectrometry (RBS) measurements the other glass constituents were not affected by the treatment.
- ItemDarstellungstheorie endlicher Gruppen(Oberwolfach-Walke : Mathematisches Forschungsinstitut Oberwolfach, 1999) Dipper, Richard; Külshammer, Burkhard; Robinson, Geoffrey R.[no abstract available]
- ItemDiagnosis and treatment of bubbles in glass production using a numerical Simulator(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1999) Kawachi, Shinji; Iwatsubo, YoshioΑ methodology to evaluate the bubble removing Performance of a tank furnace was proposed in previous papers. Since the operating data of the furnace being used for actual production can be udlized to examine the effectiveness of the above proposal, this paper deals with the verification issue when this methodology is applied to a real furnace. Additionally, various indirect indices, which have been advocated to evaluate the bubble removing Performance, are compared with the proposed direct Simulation. The results show that the phenomena experienced in the factory can be clearly explained and the direct Simulation has been proved to be very useful to diagnose and to treat bubbles during actual producdon.
- ItemThree-dimensional radiative heat transfer in glass cooling processes(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1999) Lentes, Frank Thomas; Siedow, NorbertFor the numerical Simulation of 3D radiative heat transfer in glasses and glass melts, practically applicable mathematical methods are needed for optimal handling of problems using workstation-class Computers. Since the exact Solution would require Supercomputer capabilities, approximate Solutions with a high degree of accuracy are given. An improved diffusion approximation is presented. In contrast to the classical Rosseland approximation this method makes use of the geometry and the nongrey character for the absorption of glass. The improved 3D diffusion approximation studied in the following paper has the advantage to be both efficient and sufficiently accurate.
- ItemKommutative Algebra und algebraische Geometrie(Oberwolfach-Walke : Mathematisches Forschungsinstitut Oberwolfach, 1999) Lipman, Joseph; Storch, Uwe[no abstract available]
- ItemPartial Differential Equations(Oberwolfach-Walke : Mathematisches Forschungsinstitut Oberwolfach, 1999) Kuwert, Ernst; Müller, Stefan[no abstract available]