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Institute
Two new optical imaging methods with submonolayer surface sensitivity are applied together to investigate pattern formation of adsorbate concentrations on surfaces during heterogeneously catalysed reactions. Ellipso-microscopy for surface imaging (EMSI) is based on an ellipsometric effect, reflection anisotropy microscopy (RAM) on the polarising properties of surface anisotropies. For the CO oxidation reaction on a Pt(110) surface features like front propagation, target patterns and spiral waves are observed, similar as in prior investigations by photoemission electron microscopy (PEEM). By applying EMSI and RAM simultaneously and imaging the same spot of the surface, supplementary information is gained on the properties of the reaction diffusion fronts. When observing a reaction front by EMSI and RAM at temperatures between 330 and 420 K the image of the front in RAM trails behind its image in EMSI. EMSI seems to display changes in the coverage of adsorbates while RAM relates to variations in surface structure.
Neutron diffraction experiments on powders are used to investigate the quantum mechanical behaviour of uniaxial rotators, i.e. NH3-molecules in Ni(NH3)6(PF6)2, Co(NH3)6(PF6)2 and Ni(NH3)6I2. A diffuse temperature dependent component of the total scattering, modulated ∼ sin QrH-H/QrH-H, is observed at a temperature of ≃ 20 K and below. This observation is due to the fact, that on cooling the sample to kT ∼ B (rotational constant) the rotational ground state is strongly populated. The ground state of a uniaxial free rotator, however, is completely polarized. As a consequence the scattering of those NH3 groups being in the ground state becomes coherent and is observable in diffraction experiments.
In dieser Arbeit wird ein Ansatz zum 'rapid prototyping' objektorientierter, heterogener, verteilter Informationssysteme auf der Basis des Tycoon-Systems entwickelt.
Dazu wird eine Methodik zur Transformation struktureller objektorientierter Informationsmodelle (exemplarisch OMT-Objektmodelle) in entsprechende Komponenten einer Software-Architektur entworfen, indem ausgehend von dem Beispiel-Szenario eines Umweltinformationssystems die typischen Elemente für heterogene, verteilte Informationssysteme in generischer Weise formuliert werden. Der Schwerpunkt liegt dabei auf dem Objektmanagement sowie der Anbindung bestehender, externer Datenbestände und deren logisch-funktionaler Integration.
Als Basis dient das Tycoon-System, das einen sprachlichen und architektonischen Rahmen für die typsichere Definition, Integration und Interoperation generischer Dienste in offenen Systemumgebungen bereitstellt und somit eine mögliche Grundlage für die Entwicklung persistenter Objektsysteme bietet. Die existierenden Tycoon-Features werden dabei für den Entwurf heterogener, verteilter Informationssysteme ausgenutzt. Die polymorphe Tycoon Language (TL) dient als Spezifikationssprache. Da objektorientierte Konzepte nicht direkt in TL integriert sind, sondern in Form generischer Bibliotheken an den Sprachkern angebunden werden müssen, wird zunächst generell untersucht, wie sich die Konzepte struktureller objektorientierter Modelle in entsprechende TL-Strukturen abbilden lassen bzw. welche objektorientierten Erweiterungen zu TL wünschenswert sind.
Reusable solid wheels manufactured of the old steel BV1 (nearly equivalent to the solid or monobloc wheel steel R1 according to the new nomenclature) show in some cases rolling defects on the surface of the wheel disc. The fatigue behaviour of such defects is analysed by means of the linear-elastic fracture mechanics and Monte Carlo simulation and assessed to be able to derive the allowable defect size for the non-destructive testing. This paper was firstly presented at the Second International Symposium on Fatigue Design FD’95, held in Helsinki (Finland) on 5 – 8 September 1995. The complete research report is published under the title „Oberflächendefekte im Scheibenbereich” (Manufacturing surface defects in the disc area of solid wheels). The research work was sponsored by the Deutsche Forschungsgemeinschaft (DFG).
The single most common cause leading to the diagnosis of endometrial cancer is postmenopausal bleeding. Although most patients with early-stage disease (FIGO stage I and II) can be cured, prognosis worsens considerably with increasing stage. While serum CA 125 levels are elevated only in a significant proportion of patients with advanced disease, recently a new serum marker (OVX1) for the detection of early-stage endometrial cancer was reported. Serum OVX1 levels were measured using an OVX1 radioimmunoassay (RIA) or enzyme immunoassay (EIA) in 192 patients with endometrial cancer. CA 125 levels were measured in 112 patients using the CIS ELSA CA 125 kit. Apparently healthy females had mean serum OVX1 levels measured with the OVX1–EIA of 1.34 ± 0.74 U/ml, while patients with endometriosis had mean OVX1 serum levels of 3.15 ± 2.45 U/ml. The mean OVX1 serum level for endometrial cancer patients was 2.00 ± 1.32 U/ml. These values were 2.76 ± 1.62, 6.10 ± 4.66, and 5.37 ± 3.49, respectively, using the OVX1–RIA assay. Applying a cutoff value of 2.8 U/ml, serum OVX1–EIA levels in endometrial cancer patients were increased in 25 of 127 patients (19.7%) with stage I disease, 5 of 17 patients with stage II (29.4%), 5 of 22 patients (22.7%) with stage III, and 4 of 11 patients (36.4%) with stage IV disease. Using the OVX1–RIA and a cutoff of 7.2 U/ml, serum levels were increased in 22 of 127 (17.3%) stage I, 6 of 17 (35.3%) stage II, 5 of 22 (22.7%) stage III, and 6 of 11 (54.5%) stage IV patients. Serum CA 125 levels, determined in a total of 112 patients, were elevated above 35 U/ml in 12 of 79 patients (15.2%) with stage I, 4 of 12 patients (33.3%) with stage II, 8 of 13 patients (61.5%) with stage III, and all of 8 patients (100%) with stage IV disease. While a good correlation between serum CA 125 levels and the clinical stage of the disease was found, no correlation could be detected for OVX1 and stage.
ATC-PIC NG (III): Anzeige- und Bedienkonzepte für die nächste Generation von Flugsicherungssystemen
(1997)
ATC-PIC NG (II): Teilfunktionalitäten, Nutzwertanalyse & menschliche Informationsverarbeitung
(1997)
Deduction systems
(1997)
Numerical simulation of texture development of polycrystals undergoing large plastic deformation
(1997)
Im Rahmen des DFG-Schwerpunktprogramms „Systemdynamik und Langzeitverhalten von Fahrwerk, Gleis und Untergrund“ wurde das Thema „Analyse und Bewertung des Verhaltens rißartiger Oberflächendefekte im Scheibenbereich von Eisenbahnvollrädern mit den Metho-den der probabilistischen Bruchmechanik“ behandelt. Der Abschlußbericht zu dem Projekt, das im Zeitraum von 1995 bis 1997 von der Deutschen Forschungsgemeinschaft gefördert wurde, ist an der Fachhochschule in Brandenburg an der Havel im April 1998 fertiggestellt worden. Wiederverwendbare Eisenbahnvollräder von Güterwagen, die aus dem Vollradstahl BV1 her-gestellt wurden, zeigen in einigen Fällen das Vorhandensein von Oberflächenfehlern in Form von Überwalzungen im Bereich der Radscheibe. Analysiert und bewertet wurde im Interesse der Betriebssicherheit das Dauerfestigkeitsverhalten sowie das Rißwachstumsverhalten von Ermüdungsrissen, die von solchen Überwalzungen ausgehen. Um den Einfluß der Streubreite der wesentlichen Parameter der Beanspruchung und der Beanspruchbarkeit auf die Dauerfes-tigkeit und die zyklische Rißausbreitung erfassen und die für die Betriebssicherheit erforderli-chen zulässigen Riß- bzw. Defektgrößen festlegen zu können, sind die bruchmechanischen Analysen als Monte-Carlo-Simulation gestaltet worden. Ziel der Analysen war es, zulässige Defektgrößen für die zerstörungsfreie Bauteilprüfung bei Gewährleistung der Dauerfestigkeit der mit Überwalzungen behafteten Vollräder auf wissenschaftlich fundierter Basis abzuleiten, da praktische Erfahrungen mit derartigen Defekten nicht vorlagen.
Das deutsche Gesundheitsnetz
(1998)
Personalarbeit im Internet
(1998)
Online only?
(1998)
Gespiegelt in besondern Düften …: Oasen, Seeungeheuer und weitere Spielereien der Fata Morgana
(1998)
„Wer die Natur liebt, der braucht das Beobachten ihrer Erscheinungen wie die Luft zum Atmen.” — So formulierte Marcel Minnaert das Bedürfnis der Naturbeobachtung im Vorwort seines berühmten Buchs „Licht und Farbe in der Natur” [1]. Bekannte Beispiele für Naturerscheinungen in der Atmosphäre sind Luftspiegelungen, Regenbögen und Halos. Diese optischen Phänomene bieten nicht nur faszinierende Anblicke, sondern beinhalten auch genügend Aspekte für eine interessante Physik (z. B. [2]). — Der vorliegende Artikel geht von grundlegenden physikalischen Betrachtungen aus und zeigt, daß sich alle Phänomene atmosphärischer Optik übersichtlich klassifizieren lassen. Luftspiegelungen werden exemplarisch im Detail behandelt. Viele nützliche Informationen findet man in Standardwerken [1, 3–5]; den aktuellen Stand der Forschung in Konferenzberichten, z. B. [6].
Old and new laboratory experiments on atmospheric optics with a focus on mirages, rainbows, and halos are presented. Some qualitative demonstrations serve primarily didactical purposes, e.g., by proving the existence of curved light rays in media with a gradient of the index of refraction, by directly visualizing the minimum-deviation curve for rainbow paths in water droplets, or by helping to elucidate the ray classes in hexagons that contribute to a specific halo. In addition, quantitative experiments allow a direct comparison of angular positions and intensities with analytical computations or Monte Carlo simulations of light scattering from small water droplets or ice hexagons. In particular, the latter can help us to understand complex halo phenomena.
© 1998 Optical Society of America
Rubber Bushing MBS Model
(1998)
Die dynamische Optimierung spielt eine wichtige Rolle für die wirtschaftliche Prozeßführung von thermischen Trennverfahren in der fettchemischen Industrie. In dieser Arbeit wird eine effiziente Methode zur Ermittlung optimaler Führungsstrategien für zwei verschiedene Destillationsprozesse vorgestellt. Für die Lösung der Optimierungsprobleme werden detaillierte Modelle verwendet und die ermittelten Strategien direkt an einer Laboranlage und einer Produktionsanlage realisiert. Die experimentellen Ergebnisse der Optimierung demonstrieren die Anwendbarkeit dieser Methode. Die Führungszeit kann durch eine Realisierung der optimalen Strategien erheblich reduziert werden.