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  • 2000-2004  (1)
  • 1975-1979  (1)
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  • 2000-2004  (1)
  • 1975-1979  (1)
  • 1905-1909
  • 1850-1859
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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 586-588 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lasing mode switching between two longitudinal modes is observed in transverse single mode vertical-cavity surface-emitting lasers with an extended cavity. Near- and far-field analyses carried out on devices with 2, 4, and 8 μm cavity spacers show an inherent relation between the transverse mode diameter and the calculated oxide- or thermally induced index guiding for the oscillating modes. Depending on the designed alignment of the optical longitudinal standing wave patterns relative to the oxide layer, mode switching can either be promoted or suppressed. Record-high single mode output powers up to 5.5 mW obtained from devices with 8 μm spacers and 8μm active diameter indicate the potential of the given device concept for low-divergence fundamental mode emission as required for many applications. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of orthopaedic and trauma surgery 87 (1977), S. 317-323 
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zur Klärung vibrationsbedingter Wirbelsäulenbeschwerden bei Hubschrauberpiloten wurde tierexperimentell die muskuläre Dämpfung untersucht. Am Pirbright-Meerschweinchen wurden auf einem Schwingtisch Beschleunigungswerte einmal unter Abwehrspannung, im zweiten Versuch unter maximaler Relaxation der Muskulatur gemessen. Das verspannte Tier dämpfte die bei 5 Hz auftretenden Resonanzen nahezu vollständig. Beim relaxierten Tier ließ sich im gleichen Frequenzbereich eine eindeutige Resonanzkurve entwickeln. Hingegen wurden höherfrequente Vibrationen bis 15 Hz beim relaxierten Tier in zunehmendem Maße stärker gedämpft als unter muskulärer Abwehrspannung. Die Schutzfunktion einer nicht ermüdeten Stammesmuskulatur zur Abwehr besonders schlecht tolerierter Resonanzvibrationen wird diskutiert.
    Notes: Summary For the further clarification of helicopter pilot's spinal troubles caused by vibration the muscular absorption was examined with the help of animal experiments. On a swinging-table acceleration values were measured in Pirbright cavies; at first this was done under a defence reaction of the muscles, and in second experiment under maximum muscular relaxation. In the tense animal the resonance occurring at 5 Hz was almost completely absorbed, whereas in the relaxed animal a clear resonance—curve could be developed at 5 Hz. On the other hand vibration at a higher frequency up to 15 Hz were to an increasing extent better absorbed in the relaxed animal than in animal with a muscular defence reaction. For this reason the protective function of a not fatigued musculature for the defence of especially badly tolerated resonance vibrations is being discussed.
    Type of Medium: Electronic Resource
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