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  • 1990-1994  (2)
  • 1970-1974  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5264-5268 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We analyze the forward characteristics of a-Si:H nip and pin diodes. At low bias, a well-defined exponential region exists, described by a noninteger quality factor n between 1.2 and 1.7. With increasing temperature, the quality factor decreases. This behavior can be understood with a model based on electron and hole recombination in the i layer, which relates the temperature dependence of the quality factor to the distribution of localized states in the amorphous silicon. The predictions of the model are supported by numerical calculations in which the diode device equations are solved for a given distribution of localized states. The different ideality factors are due to different energy dependencies of the density of deep states in the i layer.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1416-1418 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin-film transistors were thermally annealed while a bias voltage was applied to the gate electrode. The transfer characteristics were then measured, and the density of states distributions derived by field-effect analysis. The results indicate that the equilibrium distribution and number of defects in the transistor channel region depend on the position of the Fermi energy during annealing. Thus the density of states can be increased or decreased in parts of the band gap. A high Fermi energy during annealing results in few states high in the gap and more states low in the gap. The reverse is true for annealing while the Fermi energy is low. This is consistent with the defect pool model for silicon dangling bond states and suggests that most deep states are part of the defect pool.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Basic research in cardiology 69 (1974), S. 499-508 
    ISSN: 1435-1803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Während der Entwicklung der Herzhypertrophie wurde die zeitliche Änderung des Gehalts an Nucleinsäuren und deren radioaktive Markeirung in den Ventrikeln verfolgt, Die Untersuchungen wurden an Ratten 4 Stunden bis 4 Wochen nach Konstriktion der Aorta abdominalis durchgeführt. Zwischen dem zweiten und dem siebten postoperativen Tag nahmen sowehl die RNS-Konzentration pro g Gewebe als auch die RNS-und DNS-Menge in beiden Ventrikeln signifikant zu. Der Einbau von 8-14C Adenin in die ventrikuläre RNS, als spezifische Aktivität (dpm/mg RNS) bezeichnet, stieg nach Konstriktion steil an mit einem Maximum nach 1 bis 2 Tagen, danach nahm die Aktivität ähnlich schnell ab. Die spezifische Aktivität der ventrikulären DNS (dpm/mg DNS) erreichte einen extremen Spitzenwert am zweiten Tag und nahm dann innerhalb von zwei wochen langsam ab bis zum Ausgangswert vor der Aortenkonstriktion. Während der Untersuchungsperiode änderte sich das Muster der Nucleinsäuremarkierung in beiden Ventrikeln gleichartig. Der Einbau von Leucin in säuremarkierung in beiden Ventrikeln gleichartig. Der Einbau von Leucin in die Ventrikelproteine war ebenfalls erhöht. Es wird gefolgert, daß aus der Zunahme der Geschwindigkeit der RNS-Synthese sofort nach Konstriktion der Aorta abdominalis von Ratten und der darauffollgenden Zunahme an DNS zwei Typen von Adaptationsprozessen abgeleitet werden können: eine initiale Reaktion der Herzmuskel-und Interstitialzellen und die verzögerte proliferation mesenchymaler Zellen.
    Notes: Summary The time course of changes in content and labelling of nucleic acids in the ventricles was examined during the development of cardiac hypertrophy. Analyses were made 4 hours to 4 weeks after the constriction of the abdominal aorta in rats. Between 2 and 7 postoperative days, there were significant increases in RNA concentrations per g of tissue as well as in the total RNA and DNA contents in both ventricles. Incorporation of [8-14C]adenine into ventricular RNA expressed as the specific activity (dpm/mg RNA) increased steeply following constriction, reaching its peak in 1 to 2 days. The activity declined equally rapidly thereafter. The specific activity of ventricular DNA (dpm/mg DNA) reached an extremely high peak on the second day, then decreased slowly over a period of 2 weeks towards the preconstriction level. The pattern of changes in labelling of ventricular nucleic acids was similar in both ventricles during the experimental period. The incorporation of lecine into ventricular proteins was increased also. It is concluded that the rate of synthesis of RNA increases abruptly following constriction of the abdominal aorta in rats, followed by an increase in DNA, suggesting the existence of two types of the adaptation process; the initial response by cardiac muscle and interstitial cell components, and the prolonged mesenchymal cell proliferation.
    Type of Medium: Electronic Resource
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