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  • 1
    Electronic Resource
    Electronic Resource
    SIMS and flash desorption studies of nickel oxygen interaction (1978)
    Springer
    Applied physics 16 (1978), S. 367-373 
    Details
    ISSN: 1432-0630
    Keywords: 79.20 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract O2 exposure of polycrystalline nickel at 300 K results in characteristics changes of secondary ion emission. These can be described by a model which is in good agreement with corresponding LEED, AES, XPS, and ΔΦ results of other authors. According to this model, oxygen can be bonded on Ni in at least five different phases: 1) chemisorption, indicated by a rapid increase of Ni+, Ni 2 + , and Ni2O+ (≦5 L); 2) a rearranged chemisorption layer, characterized by a drastic decrease of Ni+, Ni 2 + , and Ni2O+ (5–15 L); 3) nickel oxide (NiO) responsible for a strong NiO−- and NiO 2 − -emission (≦40 L); 4) oxygen on top of this NiO layer, producing a final increase of Ni+ and NiO+ and a O2-flash signal at 400 K (〉40 L); 5) bulk dissolved oxygen in thermal equilibrium with a chemisorption layer (after several exposure/heating cycles). During ion bombardment of a 100 L O2 exposed Ni surface these different binding states occur in a reversed order of succession. O2-flash signals at 400 and 1100 K, related to drastic changes in secondary ion emission at 400, 700, and 1100 K, reflect the disappearance of various oxygen binding states. The exchange between different oxygen phases was studied by16O2/18O2 isotope experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885861
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  • 2
    Electronic Resource
    Electronic Resource
    Fast LEED intensity measurements with a video camera and a video tape recorder (1979)
    Springer
    Applied physics 19 (1979), S. 287-293 
    Details
    ISSN: 1432-0630
    Keywords: 06.90+v ; 61.14-x ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The measurement of LEED intensities with a TV camera-computer system, which has been published in an earlier paper, is reported to be improved with respect to the speed of data collection by a factor of about 102. Other properties such as sensitivity, reliability and handling facility have also been improved. The new measuring mode, which applies a video tape recorder, allows the simultaneous measurement of all appearing diffraction spots down to a beam current of 10−11 A with a rate of 50 energy points/s. This pushes the total measuring time for LEED spectra to the order of seconds and makes possible to monitor non-stable surfaces. As an example intensity measurements for different adsorption stages of hydrogen on W(100) are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900472
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  • 3
    Electronic Resource
    Electronic Resource
    Some aspects of auger electron spectra of 3d transition metal oxides (1977)
    Springer
    Applied physics 13 (1977), S. 43-46 
    Details
    ISSN: 1432-0630
    Keywords: 79.20 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Auger electron spectra of the transition metals Cr, Mn, Fe, Co and Ni as well as their oxides have been investigated in the energy range between 0–100 eV. In each case of the clean metal surface the observed spectrum consists essentially of one Auger line identified asM 2,3 VV transition. After oxidation a line doublet is observed revealing two transitions instead of one. Additional new Auger peaks appear in the low energy range between 0–30 eV. The “splitting” of the Auger line can be explained as resulting from aM 2,3 V dVd and aM 2,3 V pVp transition. The latter is characteristic for the compound and can in a simple way be interpreted as a cross transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00890718
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  • 4
    Electronic Resource
    Electronic Resource
    126. Indikationen und Komplikationen in der Behandlung infizierter Femur-Pseudarthrosen (1979)
    Springer
    Langenbeck's archives of surgery 349 (1979), S. 532-533 
    Details
    ISSN: 1435-2451
    Keywords: Infected pseudarthrosis ; Upper leg fixateur type I to IV ; Complications ; Results ; Infizierte Femur ; Pseudarthrose ; Oberschenkel ; Fixateur Typ I bis IV ; Komplikationen ; Ergebnisse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zur Stabilisierung der infizierten Femur-Pseudarthrose ist unabhängig von der ossären Abstützung bei gegebener Indikation die ausreichend dimensionierte Platten-Osteosynthese anderen Verfahren vorzuziehen. Andernfalls ist der Fixateurexterne indiziert. Seine Montage erfordert am Oberschenkel spezielle Kenntnisse, die sich an den individuellen Knochen— und Weichteilbefunden orientieren. Wir unterscheiden den Oberschenkelfixateur Typ I bis IV, welche beispielhaft demonstriert werden. Die Komplikationen werden zunächst vom Blutverlust und der Infektaktivität, später durch chronische Weichteilfisteln, Abscesse, osteomyelitische Resthöhlen und Spontanfrakturen bestimmt. Eine Studie analysiert die Behandlung und Spätergebnisse von 96 infizierten Femur-Pseudarthrosen.
    Notes: Summary With proper indication, adequately dimensioned plate osteosynthesis is to be preferred to any other treatment for stabilizing an infected femur pseudarthrosis, regardless of the osseous support. Otherwise the fixateur externe is indicated. Its assembly at the upper leg requires special knowledge which reflects the individual bone and soft tissue assessments. We distinguish between fixateur type I to IV on the upper leg, all of which are exemplified. Complications are at first mainly loss of blood and infective activity, later chronic soft tissue fistulae, abscesses, osteomyelitic residual cavities, and spontaneous fractures. A study analyses the treatment and the late results of 96 infected femur pseudarthroses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01729584
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  • 5
    Electronic Resource
    Electronic Resource
    193. Komplikationen nach künstlichem Gelenkersatz der Hüfte Eine retrospektive Studie nach mehr als 1000 implantierten Totalendoprothesen (1981)
    Springer
    Langenbeck's archives of surgery 355 (1981), S. 557-557 
    Details
    ISSN: 1435-2451
    Keywords: 1000 total hip arthroplasties ; Local complications ; Long-term follow-up ; Results ; 1000 Hüfttotalendoprothesen ; lokale Komplikationen ; Langzeitstudie ; Ergebnisse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zwischen 1969 und 1974 wurden im „Bergmannsheil” 1012 TEP der Hüfte implantiert (Typ Müller-Charnley). Längstens 8,5 und mindestens 1,5 Jahre nach den Operationen ergeben sich bei 259 Fällen (29 %) unterschiedlich geartete lokale Komplikationen. Auf aseptische Lockerungen entfielen 56 Fälle (5,5 %) und auf Infektionen (davon 51 septische Lockerungen) 70 Fälle (6,9 %). Die Infektquote ist in 3,2 frühmanifeste und 3,7% schleichende und späte Infektionen zu unterteilen. Andere Komplikationen wie hüftnahe Femurfrakturen, Luxationen, Dislokationen, Prothesenbrüche, Verkalkungen und Nervenschäden umfassen je 1 % oder weniger. Die Untersuchung mahnt zu strenger Indikation und beweist die biomechanischen Mängel der untersuchten Prothesengeneration mit zunehmender „Laufzeit”.
    Notes: Summary Between 1969 and 1974 1012 total hip prostheses (type Müller-Charnley) were implanted in our clinic. Reexamination 1.5 to 8.5 years after surgery on 259 cases (29 %) showed different local complications: 56 (5.5 %) were aseptic loosenings, 70 (6.9 %) infections including 51 septic loosenings. The infection rate was divided into 3.2 % early manifest and 3.7 % insidious and late infections. Other complications like femur fractures near the hip, luxations, dislocations, fractures of prostheses, calcifications, and nervous lesions amounted to 1 % or less each. The investigation demands strict indication and proves the biomechanical deficiencies of the examined prosthetic generation with increasing ‘time of operation.’
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287023
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  • 6
    Electronic Resource
    Electronic Resource
    223. Korrekturosteotomien nach Traumen am Fußskelet (1986)
    Springer
    Langenbeck's archives of surgery 369 (1986), S. 764-764 
    Details
    ISSN: 1435-2451
    Keywords: Corrective osteotomy ; Indication ; Results ; Ursache ; Indikation ; Fixateur externe ; Ergebnisse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Fußdeformitäten entstehen aus direkten Verletzungen. Ein schwer einschätzbarer Anteil resultiert aus vielfältigen Folgen von Unterschenkelverletzungen. Nach Traumen entsteht ein Verletzungssyndrom des Fußes, das nur selten die theoretisch wünschenswerte operative Korrektur erlaubt. Die Indikation zur Korrekturosteotomie in der posttraumatischen Deformität am Fuß bestimmt deshalb gänzlich andere Voraussetzungen als die orthopädische Verformung. Von 1975 bis 1984 wurden im „Bergmannsheil” bei 13 posttraumatischen Fußdeformitäten Korrekturosteotomien ausgeführt. Die Kombination aus Spitzfuß, Varus des Rückenfußes sowie sichelförmige Adduktion des Vorund Mittelfußes erfordert neben der meist lateralen und dorsalen Keilosteotomie mit Fußwurzelarthrodese oft eine Quengelung und individuelle Korrekturmaßnahmen. Zweckmäßig haben wir in 9 Fällen die Korrektur mit einem Fixateur durchgeführt. Er dient sowohl der axialen Kompression der Osteotomie als auch als Quengelapparat und benötigt keinen Platz für auftragende Implantate. In den übrigen Fällen wurde die Korrektur mit Bohrdrähten oder mittels Klammern aus zugerichteten Halbrohrplatten und Schrauben gehalten. Bei der Nachkontrolle ließ sich feststellen, daß die erreichte Korrektur sich innerhalb des ersten Jahres verschlechtert, nach weiteren Jahren resultiert eine gute funtionelle Anpassung, wobei jedoch orthopädisches Schuhwerk weiterhin erforderlich ist.
    Notes: Summary Posttraumatic deformities of the foot result from direct injuries with complex lesions of the anatomic structures involved. Operative corrections are therefore seldom performed under optimal conditions. The indications for techniques of surgery differ greatly from those for orthopedic deformities. At the “Bergmannsheil Bochum” Hospital, 13 corrective osteotomies of posttraumatic foot deformities were performed in the years 1975-1984. In most cases dorsolateral wedge osteotomy combined with arthrodesis was necessary to correct the complex deformities of posttraumatic pesequinovarus combined with internal rotation of the metatarsals. The osteosynthesis was performed 9 times with external fixation, with which axial compression and redressement can be performed. Fixation was achieved 4 times with K-wires, screws and hook-plates. The latter are made from semitubular plates. The followup showed slight deterioration of the corrections in the first year, with functional improvement in later years with the help of orthopedic footwear, which remained necessary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01274541
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