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  • 1
    ISSN: 1433-0423
    Keywords: Schlüsselwörter Ultraschallbiomikroskopie ; Kataraktchirurgie ; Hinterkammerlinsen ; Key words Ultrasound-biomicroscopy ; Cataract-surgery ; Posterior-chamber-lenses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Correct positioning of transscleral haptics for sulcus fixation of IOL haptics may be difficult due to lack of visual control by the surgeon. We determined the haptic sites in eyes which underwent secondary IOL implantation with transscleral suturing using ultrasound biomicroscopy (UBM) (Humphrey Instruments, Inc., San Leandro, CA, USA). Eighteen eyes of 17 patients were included in the study. The follow-up time ranged from 1 to 36 months (mean: 7 months). The positions of 36 IOL-haptics were documented by UBM examination. Twelve haptics (33%) were found in the sulcus, whereas 18 haptics (50%) were located posteriorly to the sulcus. Six haptics (17%) were identified anteriorly to the sulcus. There were no complications resulting from dislocation. In one of the eyes, suture infection occurred requiring surgical revision and antibiotic therapy.
    Notes: Die korrekte Positionierung der Linsenhaptiken bei transskleraler Nahtfixierung ist schwierig, da sich die Nahtführung im Sulcus ciliaris und hinter der Iris der Beobachtung durch den Operateur entzieht. Wir haben 17 Patienten (18 Augen) nach transskleraler Haptikfixierung mit dem Humphrey-Ultrasound-Biomicroscope (UBM) (Humphrey Instruments, San Leandro, CA, USA) untersucht. Die Nachbeobachtungszeit betrug zwischen 1 und 36 Monaten (Mittel: 7 Monate). Neben der Haptikposition wurde der intraokulare Druck registriert. 12 von 36 Haptiken (33%) waren im Sulcus ciliaris lokalisiert. 18 Haptiken (50%) wurden hinter dem Sulkus gefunden. Anteriore Lokalisationen (hintere Iriswurzel) wiesen 6 Haptiken (17%) auf. Komplikationen , die aus diesen Fehlpositionierungen resultieren könnten, sahen wir nicht. In einem Fall trat eine infektiöse Infiltration des Stichkanals auf, die eine operative Revision und systemische Antibiotikagabe notwendig machte.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 62 (1996), S. 181-185 
    ISSN: 1432-0630
    Keywords: 72.70 ; 85.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Heterojunctions, such as ZnO/CdS/CuGaSe2, were fabricated for photovoltaic applications. Optimization of device structures based on monocrystalline CuGaSe2 led to the highest-to-date power conversion efficiencies for CuGaSe2 solar cells. At room temperature under 100 mW/cm2 AM1.5 illumination a maximum cell efficiency of 9.7% was achieved, given by an open-circuit voltage of 946 mV, a short circuit current density of 15.5 mA/cm2, and a fill factor of 66.5%. Preparation and performance of the optimum device are described. Current voltage characteristics dependent on illumination intensity and temperature, spectral response and electron-beam-induced current measurements were performed to determine the device parameters as well as to analyse the current transport and loss mechanisms. Tunneling, assisted by defect levels in the CdS layer, seems to play a major role. High injection effects are observed at forward bias ofV 〉 0.5 V or an illumination level ofP 〉 10 mW/cm2. Under such conditions, as well as at low temperatures, the non-zero series resistance comes into play. Effects of the shunt resistance, however, are negligible in all cases.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 134 (1995), S. 167-176 
    ISSN: 0942-0940
    Keywords: Craniopharyngioma ; Gamma Knife ; radiosurgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We present our results of Gamma Knife surgery for craniopharyngioma in nine patients. The current status of surgery, radiation therapy, intracavitary instillation of radionucleides and Gamma Knife surgery in the management of craniopharyngiomas is discussed.
    Type of Medium: Electronic Resource
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