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  • 1
    Electronic Resource
    Electronic Resource
    Long-term results of anterior gastropexy for gastroesophageal reflux in children (1988)
    Springer
    Pediatric surgery international 3 (1988), S. 256-259 
    Details
    ISSN: 1437-9813
    Keywords: Gastroesophageal reflux ; Anterior gastropexy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Between 1971 and 1985, anterior gastropexy was performed in 154 children (age 1 month to 16 years, 92 younger than 1 year) for gastroesophageal reflux demonstrated by barium swallow (diagnostic in 84%), endoscopy (92%), and 24-h pH monitoring (86%). The main indications for surgery were: vomiting and failure to thrive (106 cases); apneic spells (14); recurrent respiratory infections (14); stricture (12); and substernal pain (8). Two complications occurred intraoperatively (hemorrhage and esophageal perforation) and 27 postoperatively (pneumonia 9; intestinal obstruction 6; hiatal stenosis subsequent to operation 5; delayed gastric emptying 2; gas bloating 2; paraesophageal hernia 2; gastric perforation 1), all without mortality. Long-term (1–13 years, 40 more than 5 years) follow-up was available in 143 cases (93%); the operation was considered successful in 121 (92%). Success rates for each indication were as follows: vomiting 94%; apneic spells 100%; respiratory infections 83%; stricture 67%; pain 100%. Twelve failures (8%) were noted: uncomplicated recurrent reflux in 8 patients, of whom 2 were reoperated; recurrent peptic stricture in 4, 3 reoperated. All reoperations were successful. This long-term follow-up shows that anterior gastropexy is a safe operation in children with an high success rate, particularly in cases of uncomplicated gastroesophageal reflux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00179252
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the thermodynamic limit of photovoltaic energy conversion (1981)
    Springer
    Applied physics 25 (1981), S. 119-125 
    Details
    ISSN: 1432-0630
    Keywords: 72.40 ; 85.30 ; 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 An infinite stack ofp—n junctions with smoothly varying bandgap from ∞ to 0 is considered. AnI —V characteristic is derived, which is more correct than the classical exponential characteristic. It is shown that open-circuit operation is a reversible process and leads to the Carnot efficiency, if one defines the efficiency in the way that is usual in the theory of thermodynamic engines. If instead one uses the definition of efficiency usual in photovoltaics, open-circuit mode gives rise to zero efficiency. Then operation at maximum efficiency equals operation at maximum power and is not reversible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00901283
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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