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  • 1
    Electronic Resource
    Electronic Resource
    Microstructure of polycarbonate seen by positrons as an in-situ probe (1995)
    Springer
    Applied physics 60 (1995), S. 481-486 
    Details
    ISSN: 1432-0630
    Keywords: PACS: : 78.70.Bj; 71.60.+z; 61.41.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Positron Annihilation Lifetime Spectroscopy (PALS) is used to probe the micro-structural changes in the polymer polycarbonate in terms of the changes in free volume hole size and their content as a function of temperature. The measured spectra are best fitted to three lifetime component analysis. The average hole size in the amorphous regions is determined from the measured Ortho Positronium (O-Ps) lifetime τ3 by following the treatment of Nakanishi et al. On the other hand, information about defects in the crystalline regions is revealed by trapped positrons lifetime τ2. In this polymer the average hole radius varies from 2.71 A˚ to 2.77 A˚. The present study indicates that this polymer has a glass transition temperature of 152° C. Further, we have calculated the trapping rates in the ordered and disordered regions of the polymer based on Goldanskii’s kinetic equations and an attempt is made for the first time to estimate the activation energy in the amorphous and crystalline regions separately.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538773
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Microstructure of polycarbonate seen by positrons as an in-situ probe (1995)
    Springer
    Applied physics 60 (1995), S. 481-486 
    Details
    ISSN: 1432-0630
    Keywords: 78.70.Bj ; 71.60.+z ; 61.41.+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Positron Annihilation Lifetime Spectroscopy (PALS) is used to probe the micro-structural changes in the polymer polycarbonate in terms of the changes in free volume hole size and their content as a function of temperature. The measured spectra are best fitted to three lifetime component analysis. The average hole size in the amorphous regions is determined from the measured Ortho Positronium (O-Ps) lifetime τ3 by following the treatment of Nakanishi et al. On the other hand, information about defects in the crystalline regions is revealed by trapped positrons lifetime τ2. In this polymer the average hole radius varies from 2.71 Å to 2.77 Å. The present study indicates that this polymer has a glass transition temperature of 152°C. Further, we have calculated the trapping rates in the ordered and disordered regions of the polymer based on Goldanskii's kinetic equations and an attempt is made for the first time to estimate the activation energy in the amorphous and crystalline regions separately.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538773
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Nonrefluxing biliary appendicoduodenostomy for choledochal cyst (1995)
    Springer
    Pediatric surgery international 10 (1995), S. 207-208 
    Details
    ISSN: 1437-9813
    Keywords: Biliary appendicoduodenostomy ; Choledochal cyst ; Appendix ; Biliary atresia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A new technique of biliary appendicoduodenostomy along with an antireflux procedure was used for the treatment of a choledochal cyst, with a satisfactory result.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171203
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    A new variant of esophageal atresia with tracheoesophageal fistula and duodenal atresia: a diagnostic dilemma (1997)
    Springer
    Pediatric surgery international 12 (1997), S. 186-187 
    Details
    ISSN: 1437-9813
    Keywords: Key words Esophageal atresia ; Tracheoesophageal fistula ; Duodenal atresia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  A new variant of esophageal atresia (EA) with tracheoesophageal fistula (TEF) associated with duodenal atresia is reported. The TEF was between the lower pouch and the trachea, with a cystic dilatation in the midportion. The tracheal end of the fistula was obstructed by a membranous septum at both ends of a cystic dilatation, leading to a diagnosis of pure EA (gasless abdomen). After the lower pouch was opened beyond the cystic dilatation, 100 ml nonbilious fluid was obtained. A laparotomy revealed a type III atresia of the first part of the duodenum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003830050099
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    A new variant of esophageal atresia with tracheoesophageal fistula and duodenal atresia: a diagnostic dilemma (1997)
    Springer
    Pediatric surgery international 12 (1997), S. 186-187 
    Details
    ISSN: 1437-9813
    Keywords: Esophageal atresia ; Tracheoesophageal fistula ; Duodenal atresia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A new variant of esophageal atresia (EA) with tracheoesophageal fistula (TEF) associated with duodenal atresia is reported. The TEF was between the lower pouch and the trachea, with a cystic dilatation in the midportion. The tracheal end of the fistula was obstructed by a membranous septum at both ends of a cystic dilatation, leading to a diagnosis of pure EA (gasless abdomen). After the lower pouch was opened beyond the cystic dilatation, 100 ml nonbilious fluid was obtained. A laparotomy revealed a type III atresia of the first part of the duodenum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01349995
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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