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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 71 (2000), S. 611-615 
    ISSN: 1432-0649
    Keywords: PACS: 47.27.-i; 42.62.Fi; 47.55.Kf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The feasibility of liquid-phase velocity measurements in dense sprays by 2D laser-based flow tagging is demonstrated. Velocity measurements in dense sprays are difficult with conventional techniques because of the high number densities of droplets, the optical thickness of the medium, and multiple light-scattering effects. The present flow-tagging technique is based on phosphorescent tracer molecules, which are excited by a grid of pulsed ‘write’ laser beams. The motion of the tagged droplet groups can be observed by a CCD camera in this way. In addition, multiple consecutive velocity measurements are performed by ‘droplet-group tracking’. This yields the acceleration along the trajectory of individual groups of droplets in unsteady sprays.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 70 (2000), S. 463-466 
    ISSN: 1432-0649
    Keywords: PACS: 47.27.-i; 42.62.Fi; 47.55.Kf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. It is demonstrated in this work that gas-phase velocity measurements can be performed in dense sprays by using a new 2D laser-based flow tagging technique. Velocity measurements in dense sprays, such as automotive direct injection (DI) Otto and Diesel sprays, are difficult with conventional techniques because of the high number densities of droplets, the optical thickness of the medium, and multiple light scattering effects. The present flow tagging technique is performed by two consecutive laser pulses, i.e., ‘write’ and ‘read’ lasers. The write laser creates a grid of tracer molecules (NO) by inducing a photodissociation process. The tracer molecules are convected with the flow and probed by the read laser after a certain delay. The instantaneous velocity field is determined by time-of-flight analysis.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Der Pathologe 20 (1999), S. 351-354 
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Malakoplakie ; Kolon ; Intestinale Blutung ; Key words Malakoplakia ; Colon  ;  Intestianal Bleeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary We report on a 62-year-old female patient with melena in which polypoid lesions of the cecum were discovered endoscopically. Histological examination of mucosal biopsies revealed an inflammatory process with lots of histiocytes and so-called Michaelis-Gutmann bodies, leading to the diagnosis of a malakoplakia of the colon. No other organs were found affected. In the course of an antibiotic therapy, there was no melena detectable over a period of six months. Malakoplakia, an inflammation usually affecting the urogenital tract, is rarely found in the colon, with only 35 cases published until now. It is frequently associated with other diseases like neoplastic or inflammatory disorders, immune defect syndromes or heroin abuse. This spectrum is expanded by our report in which a long-standing alcohol abuse was found as an attendant disease.
    Notes: Zusammenfassung Es wird der Fall einer 62jährigen Patientin vorgestellt, bei der anläßlich einer aufgrund von Teerstühlen durchgeführten Koloskopie polypöse Schleimhautvorwölbungen im Zäkum festgestellt und biopsiert wurden. Histologisch zeigte sich eine histiozytenreiche Entzündung mit Nachweis sog. Michaelis-Gutmann-Körperchen im Sinne einer Malakoplakie. Es wurden keine anderweitigen Organmanifestationen dieser Erkrankung gefunden. Nach Einleitung einer antibiotischen Therapie wurden innerhalb eines Beobachtungszeitraums von 6 Monaten keine Teerstühle mehr festgestellt. Das Kolon stellt einen ungewöhnlichen Manifestationsort der üblicherweise im Urogenitaltrakt auftretenden Malakoplakie mit bisher erst 35 Fälle publizierten Fälle dar. Häufig ist die Malakoplakie mit anderen Grunderkrankungen (z. B. Neoplasien, Infektionskrankheiten, Autoimmunerkrankungen, Immundefekten, Heroinabusus) assoziiert. Dieses Spektrum wird durch den vorliegenden Fall ergänzt, in dem ein langjähriger Alkoholabusus als Begleiterkrankung vorlag.
    Type of Medium: Electronic Resource
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