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  • 1
    Electronic Resource
    Electronic Resource
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Phase equilibria in the Ag-CuO-Cu2O system were experimentally determined using thermal analysis, and structural and compositional studies. Three reactions were observed in air: (1) L1= CuO + Ag, (2) L2= CuO + L1, and (3) Cu2O = CuO + L2. The evolution and absorption of oxygen accompanied these reactions. At oxygen partial pressures below 0.02 bar, the reactions L1= Cu2O + Ag and L2= Cu2O + L1 were found. Based on isobaric projections in the Ag-CuO-Cu2O system, two invariant reactions, L1= CuO + Cu2O + Ag and L2= CuO + Cu2O + L1, were deduced.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 159-160 (May 1998), p. 135-150 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1433-0431
    Keywords: Key words AC joint dislocation • AC joint stabilization • AC joint arthroplasty • Rockwood classification • PDS augmentation ; Schüsselwörter AC-Gelenkluxation • AC-Gelenkstabilisierung • AC-Gelenkresektionsarthroplastik • Rockwood-Klassifikation • PDS-Augmentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 42 Patienten mit posttraumatischer Residualinstabilität und/oder sekundärer Akromioklavikular (AC)Arthrose nach AC-Gelenksubluxationen wurden operativ behandelt. In 26 Fällen lag eine deutliche horizontale Instabilität mit Klavikulaversatz um mindestens halbe Schaftbreite sowie Läsionen der Deltotrapezoidfaszie vor. Der ursprüngliche Verletzungstyp umfaßte: Rockwood II: 7 Fälle; III: 9; IV: 17; V: 9. In 23 Fällen wurde eine ausschließliche Weaver-Dunn-Operation vorgenommen. Von den 26 Patienten mit horizontaler Instabilität wurden 7 ebenfalls mit einer Standard-Weaver-Dunn-Operation behandelt und die restlichen 19 zusätzlich mit einer korakoklavikulären (3 × 1 mm) und AC- (1 × 1- oder 1,5-mm) PDS-Kordelaugmentation in Verbindung mit einer Deltotrapezoidfaszienplastik. Ergebnisse: Im Patte-Score wurden nach einer Mindestnachuntersuchungszeit von 2 Jahren (Mittelwert: 32 Monate) mit der Weaver-Dunn-Operation 88,4 % erfolgreiche Resultate erzielt. Dabei traten signifikante Unterschiede auf zwischen Patienten mit horizontaler Restinstabilität (57,2 % gute und sehr gute Ergebnisse) und solchen ohne (93,8 % gute und sehr gute Resultate). Die Gruppe mit horizontaler Instabilität, die zusätzlich zur Weaver-Dunn-Operation noch eine komplexe Augmentation und Faszienstabilisierung erhielt, erreichte 89,5 % sehr gute und gute Resultate. Schlußfolgerung: Unter den Patienten mit schlechten Ergebnissen nach konservativer Behandlung von ACG-Sprengungen scheinen Fälle mit horizontaler Instabilität und Verletzungen der Deltotrapzeoidfaszie überrepräsentiert zu sein. In diesen Fällen können durch Ergänzung der klassischen Weaver-Dunn-Operation um eine korakoklavikuläre und akromioklavikuläre PDS-Augmentation mit Deltotrapzeoidfaszienplastik gleich gute Ergebnisse erzielt werden wie bei Patienten mit im wesentlichen vertikaler Residualinstabilität und Arthrose.
    Notes: Summary Resection arthroplasty of the AC joint was performed in 42 cases of osteoarthrosis and residual instability of traumatic origin including 26 shoulders with horizontal instability of more than half of the width of the clacicula and lesions of the deltotrapezoid fascial complex (Rockwood type II: 7; type III: 9; type IV: 17; type V: 9). 23 cases were treated with a sole Weaver-Dunn procedure. 26 cases with horizontal instability and lesions of the deltotrapezoid fascia (Rockwood IV and V type) were treated in 7 cases with the standard Weaver-Dunn procedure and in 19 cases with a modified Weaver-Dunn procedure in combination with a coracoclavicular (3 × 1) and acromio-clavicular (1 × 1) 1 mm PDS string augmentation and double breasting fascioplasty of the deltotrapezoid complex. Results: Successful results (in Patte-Score) after a minimum follow-up of 2 years (mean: 32 months) were reached in 88,4 % of cases with only Weaver/Dunn procedure with a significant difference of good and excellent results in the horizontally stable group (93.8 %) versus the horizontally unstable group (57.2 %). In the group with horizontal instability and Weaver-Dunn procedure and complex additional stabilization with fascioplasty and PDS augmentation, 89,5 % excellent and good results were found. Conclusion: Cases with horizontal instability (type Rockwood IV and V) seem to be overrepresented among patients with failed conservative treatment. Resection arthroplasty with ligament transposition after Weaver/Dunn gives excellent results in posttraumatic osteoarthrosis with mainly vertical and moderate horizontal instability. In cases with advanced horizontal instability after Rockwood IV and V injuries, almost equal results can be reached by an additional coracoclavicular and acriomioclavicular PDS augmentation with deltotapezoid fascioplasty.
    Type of Medium: Electronic Resource
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