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  • 1
    Electronic Resource
    Electronic Resource
    Sonographic appearance of nonoperatively treated Achilles tendon ruptures (2000)
    Springer
    Skeletal radiology 29 (2000), S. 259-264 
    Details
    ISSN: 1432-2161
    Keywords: Key words Achilles tendon ; Rupture ; Tendon injuries ; Ultrasonography ; Doppler, color
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. This report describes the gray-scale and color Doppler sonographic appearance of healed Achilles tendon ruptures that have been treated nonoperatively. Design and patients. Eleven patients with acute Achilles tendon ruptures were studied with sonography in the acute setting and following nonoperative management of their torn tendon. Results. On sonographic examination, healed tendons treated nonoperatively are characterized by mild residual distortion of the normal fibrillar architecture of the tendon, anterior bulging or irregularity of the healed tendon, and a hypoechoic area about the site of rupture. Less frequent observations include mildly increased color flow and calcification at the rupture site. The previously described findings of acute tears, including hematomas, gaps at the rupture site, hyperemic torn tendon ends, and markedly distorted fibrillar architecture, were seen to have resolved in this series. Conclusion. The Achilles tendon tear treated nonoperatively has a different sonographic appearance from that of a normal or acutely ruptured tendon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002560050604
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The effects of carrier degeneracy on transport properties of the double heterostructure injection laser (1976)
    Springer
    Applied physics 9 (1976), S. 161-164 
    Details
    ISSN: 1432-0630
    Keywords: Semiconductor lasers ; Heterojunction theory ; I–V characteristics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract It is shown that carrier degeneracy plays an important role in determining the electrical properties of double heterostructure injection lasers. Correct statistical treatment of the charge cariers in the device leads to a generalised Einstein relation between the carrier transport coefficients. Such a relation (for both electrons and holes) is used in numerical solutions of semiconductor transport equations applicable to the laser. Experimentally observed I–V characteristics of the laser are explained in terms of carrier degeneracy effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903953
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    Paper (German National Licenses)
    Fulltext
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