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  • 1985-1989  (4)
  • 1970-1974  (1)
  • 1
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In 1903 Curie and Laborde5 used a calorimeter to verify that the heat produced by a radioactive substance results from the absorption of its energetic radiation. After this, microcalorimetry became of great theoretical importance through the determination6 of the 0.337-MeV average energy of 210Bi ...
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1998
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The potentially of early chest X-ray to predict the risk of lung function abnormalities was studied prospectively in 40 preterm ventilator treated infants in a 8–10-year follow-up investigation. According to the findings at chest X-ray 3 to 10 days after completed ventilator treatment the infants were divided into 3 groups considered to represent increasing risk and severity of lung damage: 1) normal findings, 2) interstitial parenchymal abnormalities exclusively or 3) in combination with local or general hyperinflation. Lung function tests and chest x-ray were performed at the age of 8 to 10 years. A correlation was found between the findings at the early chest roentgen examination and the risk of abnormal lung function at the follow-up. Occurrence of focal or general hyperinflation or both were associated with a greater risk of airway obstruction. Infants with only interstitial abnormalities were, however, at a higher risk than those with normal chest examination to develop general hyperinflation and increased air way obstruction.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 332 (1989), S. 413-417 
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.60.Cs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The proton-rich isotopes32Ar-35Ar represent the first sequence for which the superallowed Gamow-Teller strength is known out toZ− N=4. The results are compared with two sets of predictions from large shell-model calculations, which give systematically different quenching factors, on the average 0.54 and 0.89. Possible reasons for this are discussed. A comparison is also made with the Gamow-Teller strength of proton-rich isotopes of neighbouring elements.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 25 (1987), S. 463-466 
    ISSN: 1741-0444
    Keywords: Flow-proportional admixture ; Lung function testing ; Technique ; Tracer gas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 9 (1971), S. 431-445 
    ISSN: 1741-0444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire La pression du sang artériel et la proportion de pulsations du volume ont été mésurées expérimentalement comme fonctions de temps, pour un segment du bras humain. En utilisant ces courbes et un type de programme d'identification, commun dans les vérifications techniques, on a calculé un modèle mathématique pour l'arbre artériel inclu dans le segment. Ce modèle mathématique mena à la construction d'un circuit électrique analogue, pour simuler la dépendance du temps de la proportion de pulsations du volume sur la pression artérielle. Dans les deux cas les résultats montrent un accord étroit entre les courbes simulées et les courbes physiologiques déterminées expérimentalement. L'inertie du sang et des vaisseaux paraît être négligeable, tandis que les adaptations non-linéaires doivent être inclues quand on utilise des vastes rangées de pression.
    Abstract: Zusammenfassung Der Arterienblutdruck und die Geschwindigkeit des Volumenpulsierens wurden experimentell für ein Segment des menschlichen Arms als Funktionen der Zeit gemessen. Unter verwendung dieser Kurven und einer Art von Identifizierungsprogramm, das in der Regeltechnik üblich ist, wurde ein mathematisches Modell für den, in das Segment eingeschlossenen Arterienbaum berechnet. Dieses mathematische Modell führte zu dem Entwurf einer analogen elektrischen Schaltung zur Nachahmung der zeitlichen Abhängigkeit der Geschwindigkeit des Raumpulsierens von dem Arteriendruck. In beiden Fällen geben die Resultate eine naheliegende Übereinstimmung zwischen den nachgeahmten Kurven und den experimentell ermittelten, physiologischen Kurven. Es wird gezeigt, dass die Trägheit von Blut und Gefässen unbedeutend ist, während nicht-lineare Nachgiebigkeit berücksichtigt werden muss, wenn es sich um grosse Druckbereiche handelt.
    Notes: Abstract The arterial blood pressure and the rate of volume pulsations were measured experimentally as functions of time for a segment of the human arm. Using these curves and a type of identification program, common in control engineering, a mathematical model was calculated for the arterial tree included in the segment. This mathematical model led to the construction of an electrical analogue circuit for simulating the time-dependence of the rate of volume pulsations on the arterial pressure. In both cases the results show a close agreement between the simulated curves and the physiological curves determined experimentally. The inertia of blood and vessels is shown to be negligible, while non-linear compliances must be included when dealing with wide pressure ranges.
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