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  • 1
    Electronic Resource
    Electronic Resource
    Semi-insulating electrical properties of undoped inp after heat treatment in a phosphorus atmosphere (1989)
    Springer
    Applied physics 48 (1989), S. 315-319 
    Details
    ISSN: 1432-0630
    Keywords: 72.80.Ey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Nominally undoped InP wafers have been annealed in a phosphorus atmosphere under a pressure of about 5 bar at temperatures of 900 °C for about 80 h. It was found that the electrical properties of the samples changed considerably after this treatment. A room temperature resistivity of up to 2×107Ωcm (semi-insulating behaviour) was obtained in the bulk of the samples. The resistivity finally obtained depends on the starting carrier concentration of the untreated samples. The Hall coefficient and Hall mobility have been measured up to 600 °C. The results can be interpreted in terms of a deep electronic level (E A=0.63 ... 0.65 eV below the conduction band). The Hall coefficient was always found to be negative resulting in a Hall mobility of 1.4 to 4.9×103 cm2/Vs. The highest resistivity in nominally undoped bulk InP so far reported in the literature [1] was ϱ=3.6 × 105Ωcm. Therefore, this paper demonstrates for the first time that a really semi-insulating behaviour of ϱ〉107 Ωcm can be achieved for bulk InP with the purity of nominally undoped material (1015 to 1016cm−3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618891
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electron loss and capture to continuum from He and Ne atoms bombarded with He+-Ions (1988)
    Springer
    The European physical journal 9 (1988), S. 229-234 
    Details
    ISSN: 1434-6079
    Keywords: 34.50.Fa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the cusp electron yield in coincidence with the transmitted charge state (He0, He+ and He++) when3He+ collides with He and Ne under single collision conditions. For the first time this enables the electron capture to the continuum (ECC) yield to be directly compared with that from electron loss to continuum (ELC). While the ECC contribution is smaller than that from ELC at high projectile velocities (V p 〉3 au) the data suggest that ECC will dominate belowV p =2.8 au. The relevance of the results to the projectile velocity dependence of existing capture theories is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438294
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    156. Stabilere Fixateur externe Osteosynthesen durch Einsatz eines neu entwickelten Schraubennagels (1982)
    Springer
    Langenbeck's archives of surgery 358 (1982), S. 486-486 
    Details
    ISSN: 1435-2451
    Keywords: External fixation ; 4.5 or 7 mm Screw-pin ; 5 or 8 mm Schanz screw ; Fixateur externe ; 4,5 bzw. 7 mm Schraubennagel ; 5 bzw. 8 mm Schanzsche Schraube
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Frühere Untersuchungen hatten gezeigt, daß die bisher verwendeten 4,5 mm Steinmann-Nägel mit zentralem Gewinde die schwächsten Teile der Fixateur externe Systeme darstellen. Daher entwickelten wir einen abgesetzten Schraubennagel (4,5 bzw. 7 mm) mit AO-Corticalisgewinde. In experimentellen Untersuchungen waren Montagen mit neuen Schraubennägeln bis zu 40% stabiler als vergleichbare Montagen mit normalen Steinmann-Nägeln. Erste klinische Anwendungen waren erfolgreich. In Analogie zu unserem Nagel wurde eine modifizierte Schanzsche Schraube (5 bzw. 8 mm) entwickelt.
    Notes: Summary Investigations have shown that the normal 4.5 mm Steinmann-nails with a central thread are the weakest part of external fixation systems. Therefore we developed a 4.5 or 7 mm screw-nail with the thread of AO cortical screws. In experimental studies we found that mounting forms with the new screw-nails were up to 40% more stable in comparison to those with conventional Steinmann pins. First clinical trials were successful. In analogy to our screw-nail we developed a modified Schanz screw (5 or 8 mm diameter).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01271902
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    421. Möglichkeiten der Stabilitätserhöhung oder Implantatreduktion beim Fixateur externe durch modifizierte Schanzsche Schrauben (1983)
    Springer
    Langenbeck's archives of surgery 361 (1983), S. 939-939 
    Details
    ISSN: 1435-2451
    Keywords: External fixator ; Modified Schanz screws ; Increased stability ; Reduced number of implants ; Fixateur externe ; Modifizierte Schanzsche Schrauben ; Höhere Stabilität ; Reduktion der Implantatanzahl
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In einer experimentellen Untersuchung wurden verschiedene Fixateur externe-Montagen an Frakturmodellen unter exzentrischer Belastung hinsichtlich ihrer Bewegungen am Bruchspalt verglichen. Dabei zeigte ein Aufbau mit 4 modifizierten 5/8-mm-Schanzschen-Schrauben in der lateralen Klammer eines Oberschenkelfixateurs Typ III eine höhere Stabilität als eine Konstruktion mit 6 herkömmlichen 5-mm-Schrauben. Daraus schließen wir, daß der Einsatz unserer modifizierten Schanzschen Schrauben die Möglichkeit der Implantatreduktion bei gleichzeitiger Festigkeitserhöhung bietet.
    Notes: Summary In an experimental study we compared different constructions of external fixators in bone models under excentric load with reference to the movements in the fracture space. Four modified Schanz screws 5/8 mm in diameter in the lateral bracket of a type-III femur fixator gave even greater stability than a construction with six normal 5-mm screws. We conclude that if our modified Schanz screws are used in external fixation the number of implants can be reduced while the stability is rendered even greater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276247
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    Paper (German National Licenses)
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