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  • 1
    Electronic Resource
    Electronic Resource
    Askin's tumor in children: report of two cases (1992)
    Springer
    Pediatric surgery international 7 (1992), S. 73-75 
    Details
    ISSN: 1437-9813
    Keywords: Askin's tumor ; Peripheral neuroectodermal tumors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Two cases of Askin's tumor of the thoracopulmonary region in children (a 6-year-old female and a 5-year-old male) are presented. Primary surgery was unfeasible and despite aggressive chemotherapy both died within 304 and 300 days, respectively, from the onset of the disease. Although rare, Askin's tumor should be considered in the differential diagnosis of any thoracopulmonary mass in childhood and adolescence through appropriate histology and immunohistochemistry of incisional biopsies. Its prognosis is poor unless radical surgery is performed as soon as possible: unresectable tumors can be treated with chemotherapy, but prolonged chemotherapy yields potentially lethal complications. We conclude that only early diagnosis and cytogenetic recognition can give children with Askin's tumor a chance of curative surgery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00181010
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Search for high energy γ-rays emission in28Si,32S+64Ni dissipative reactions at about 5 MeV/amu incident energy (1991)
    Springer
    The European physical journal 340 (1991), S. 341-342 
    Details
    ISSN: 1434-601X
    Keywords: 24.30.Cz ; 25.70−z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photons emitted in the28 Si+64 Ni and32 S+64 Ni reactions at 143 MeV and 156 MeV incident energy respectively, have been detected in coincidence with the ejected charged fragments. An array of 48 BaF2 γ-rays detector and 6 solid state silicon detector telescopes have been used. Photon energy spectra measured in the energy range from 2 to 20 MeV in coincidence with ejectiles coming from deep inelastic reactions, are consistent with statistical emission from the reaction products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294684
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Structural modifications of a spent molten carbonate fuel cell (1990)
    Springer
    Journal of applied electrochemistry 20 (1990), S. 804-810 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Several performance and endurance tests have been carried out on molten carbonate fuel cells (MCFC) operating at different temperatures (873, 893 and 923 K). Electrochemical performance parameters, morphological characteristics and chemical analyses on samples of spent electrodes and tiles were evaluated. An output power decrease of 10% from the original value was taken to be the largest acceptable decay. Cell operation was stopped upon reaching this point. Electrolyte losses ranging from 18.6 to 24.5 of the original content were the determining factor in the MCFC performance decrease. Scanning electron microscopy showed that post-test anodes retained a satisfactory microstructure, while the tiles appeared to be very sensitive to the effect of operating temperature. The cathode structure, after an initialin situ oxidation, appeared to consist of agglomerates of 0.9 μm NiO crystallites. Long-term operation produces some modification of the pore size distributions of the used components, resulting in a final electrolyte distribution that was far from optimal. Due to the opposite effect of temperature on cell lifetime and power output, the highest power output and shortest cell lifetime were obtained for the 923 K test.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01094310
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Oxidative chemical polymerization of pyrrole (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 2649-2655 
    Details
    ISSN: 1572-8943
    Keywords: calorimetry of conductive polymers ; conducting polymers ; kinetics of polypyrrole ; polypyrrole ; thermodynamics of polypyrrole
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels eines Reaktionskalorimeters wurden bei drei verschiedenen Temperaturen die Enthalpiewerte der Polymerisation von in Acetonitril gelöstem Pyrrol, unter der Anwendung von FeCl3 als Oxidationsmittel bestimmt. Aus den kalorimetrischen Daten ergibt sich, daß es sich bezogen auf Pyrrol um eine Reaktion erster Ordnung handelt. Bei den gleichen Temperaturen wurden auch die Geschwindigkeitskonstanten bestimmt. Unter Anwendung der Arrhenius'schen Gleichung haben wir auch die Aktivierungsenergie der Bildung dieses elektronenleitenden Polymers ermittelt.
    Notes: Abstract A reaction calorimeter has been used to determine at three different temperatures the enthalpy values for the polymerization of pyrrole dissolved in acetonitrile, by using FeCl3 as the oxidative agent. From the calorimetric data it has been found that the reaction is first-order with respect to the pyrrole. The rate constants at the same temperatures have also been determined. By using the Arrhenius equation we have obtained the activation energy for the formation of this electroconducting polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979741
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    Paper (German National Licenses)
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