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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 340 (1991), S. 377-384 
    ISSN: 1434-601X
    Keywords: 14.80.Pb ; 12.90.+b ; 23.20.Nx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The anomalous electron-positron coincidences observed in heavy-ion collisions have been interpreted as signal for the pair decay of hitherto unknown neutral objects with masses around 1.8 MeV. We discuss the decay modes of such extended composite particles when they are bound to a nucleus. In particular we investigate the angular correlation of the emitted pair and the competing single-photon decay channel. We confront the particle hypothesis with recent negative results from experiments searching for resonances in Bhabha scattering. The induced pair decay of a metastable 1++ state in secondary collisions with target atoms is discussed as a possible explanation.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Erbium:YAG-Laser ; Dermablation ; Skin ; resurfacing ; Key words Erbium:YAG laser ; Dermal ablation ; Skin resurfacing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The erbium:YAG laser (wavelength 2940 nm; pulse duration 0.350 ms; pulse energy 0.1–1.7 J) allows vaporization of very thin skin layers without scarring and minimal lateral thermal injury due to an extremely short pulse duration. It permits exact ablation of relatively large areas of facial skin. We report our results with 216 patients following treatment for different facial lesions (facial wrinkles, acne scars, syringomas, and circumscribed sebaceous gland hyperplasia) using a new erbium:YAG laser system. Good-to-excellent cosmetic results were obtained in these patients. Our findings show that the erbium:YAG laser is an elegant and promising new method for the treatment of facial lesions.
    Notes: Zusammenfassung Der Erbium:YAG-Laser (2940 nm Wellenlänge; 0,350 ms Pulsbreite; 0,1-1,7 J Pulsenergie) gewährleistet durch seine extrem kurze Impulsdauer eine narbenfreie Ablation sehr dünner Hautschichten mit Minimierung thermisch bedingter Schäden in der Umgebung der behandelten Hautareale. Er erlaubt ein kontolliertes, exaktes Arbeiten und ermöglicht eine großflächige Behandlung der Haut im Gesichtsbereich. Wir berichten über unsere Ergebnisse an 216 Patienten, die wegen verschiedener störender Hautveränderungen im Gesichtsbereich (Hautfältchen, Aknenarben, Syringome, Talgdrüsenhyperplasien) mit dem Erbium:YAG-Laser behandelt wurden und gute bis sehr gute kosmetische Ergebnisse nach der Laserbehandlung zeigten. Wir sehen in der Anwendung des Erbium:YAG-Laser eine elegante und vielversprechende neue Methode zur Behandlung verschiedener Gesichtshautveränderungen.
    Type of Medium: Electronic Resource
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