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  • 1
    Electronic Resource
    Electronic Resource
    Scanning tunneling microscopy of the GaN(000 〈 ![IGNORE[$\bar{1}$]] ) surface (1998)
    Springer
    Applied physics 66 (1998), S. S947 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.35.Bs; 68.55.Jk; 61.16.Ch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: ) surface. Four dominant reconstructions have been observed: 1×1, 3×3, 6×6, and c(6×12). The 1×1 structure is formed by annealing the as-grown GaN surface to desorb excess Ga atoms. The higher-order reconstructions are formed by depositing sub-monolayer quantities of Ga atoms onto this 1×1surface. STM images showing the details of the reconstructions are presented and results of quantitative measurements of the number of Ga atoms required to form the various reconstructions are reported. Structural models are compared with the STM data. Reversible order/disorder phase transitions and adatom motion on the GaN surface are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051272
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Real-time ultrasonography of the spinal cord: intraoperative and postoperative imaging (1984)
    Springer
    Neuroradiology 26 (1984), S. 183-187 
    Details
    ISSN: 1432-1920
    Keywords: Neurosonography ; spinal cord ; syringomyelia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Fourteen subjects with spinal cord pathology were studied with 10 MHz linear array or 5 MHz mechanical sector ultrasound scanners. Twelve patients were studied intraoperatively. The examinations were rapid, aiding the surgeon at the time of exploration. Sonography defined cysts, outlined the extent of neoplasia and aided in the localization of bone fragments. Guidance for placement of syringo-subarachnoid shunts reduced the amount of surgical manipulation. Four patients were examined postoperatively through laminectomy defects, three confirming adequate position and function of shunts and in one case demonstrating tumor recurrence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00342412
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    Paper (German National Licenses)
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