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  • 2000-2004  (8)
  • 1960-1964  (10)
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  • 1
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1555-1563 
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Photoacoustic spectroscopy is an absorption spectroscopy technique that is currently used for low-level gas detection and catalyst characterization. It is a promising technique for chemical analysis in mesoscale analysis systems because the detection limit scales favorably with miniaturization. This work focuses on the scaling properties of photoacoustic spectroscopy, and on the miniaturization of gas-phase photoacoustic detection of propane in a nitrogen ambient. The detection system is modeled with a transmission line analogy, which is verified experimentally. The model includes the effects of acoustic leaks and absorption saturation. These two phenomena degrade the performance of the photoacoustic detector and must be controlled to realize the scaling advantages of photoacoustic systems. The miniature brass cells used to verify the model employ hearing aid microphones and optical excitation from a mechanically chopped, 3.39 μm He–Ne laser, transmitted into the cells with an optical fiber. These cells are able to detect 10 ppm of propane in nitrogen (a signal level of ∼1 Pa/W). We also describe the development of a miniaturized photoacoustic system formed by microfabrication. In this case, the pressure-driven deflection of the detection membrane is measured optically. These systems show that photoacoustic detection may be inappropriate for systems with large variations in gas concentration because of absorption saturation and changing gas acoustic properties. Nevertheless, photoacoustic spectroscopy is a promising technique for the analysis of dilute mixtures in miniature chemical systems. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK and Boston, USA : Blackwell Publishing Ltd
    Child and adolescent mental health 5 (2000), S. 0 
    ISSN: 1475-3588
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Psychologie
    Notizen: Body Dysmorphic Disorder (BDD) is an excessive preoccupation with an imagined, or real, slight defect in normal physical appearance. The disorder, which usually begins during adolescence, tends to be chronic, and probably is much more common than is usually thought. This review presents an overview of the available scientific literature of BDD. It provides information about historical aspects, epidemiology, clinical features, aetiology, and instruments for assessing BDD. The relationship of BDD with other psychiatric disorders such as depression, obsessive-compulsive disorders, anxiety disorders, schizophrenia, eating disorders and personality disorders is discussed. Aetiological theories, including psychological and neurobiological explanations, are reviewed. Finally, psychopharmacological and psychotherapeutic treatment approaches are presented with special regard to treatment with serotonin-reuptake inhibitors, behavioural therapy and cognitive-behavioural therapy.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    New York : Cambridge University Press
    Church history 31 (1962), S. 460-461 
    ISSN: 0009-6407
    Quelle: Cambridge Journals Digital Archives
    Thema: Geschichte , Theologie und Religionswissenschaft
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    New York : Cambridge University Press
    Church history 32 (1963), S. 474-476 
    ISSN: 0009-6407
    Quelle: Cambridge Journals Digital Archives
    Thema: Geschichte , Theologie und Religionswissenschaft
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    New York : Cambridge University Press
    Church history 31 (1962), S. 459-460 
    ISSN: 0009-6407
    Quelle: Cambridge Journals Digital Archives
    Thema: Geschichte , Theologie und Religionswissenschaft
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 117 (2002), S. 3711-3714 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The optical response of Li4+ and Li7+ exhibits three large maxima at photon energies between 1.9 and 3.6 eV, on which a fine structures could be resolved that has a peak to peak distance of about 30–40 meV. A high level ab initio calculation of Li4+ shows that this feature is due to vibrational structure of the excited electronic state. It is pointed out that the lifetime of the excited states exhibits a dramatic shortening with increasing particle size. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    New York : Cambridge University Press
    Church history 30 (1961), S. 236-237 
    ISSN: 0009-6407
    Quelle: Cambridge Journals Digital Archives
    Thema: Geschichte , Theologie und Religionswissenschaft
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    ISSN: 0009-6407
    Quelle: Cambridge Journals Digital Archives
    Thema: Geschichte , Theologie und Religionswissenschaft
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    New York : Cambridge University Press
    Church history 30 (1961), S. 35-49 
    ISSN: 0009-6407
    Quelle: Cambridge Journals Digital Archives
    Thema: Geschichte , Theologie und Religionswissenschaft
    Notizen: At Ferrara and Florence the healing of the old schism between the Eastern and Western Chruches proved to be more than a hope, and in corresponding measure the breach between the Pope and the Council of Basel became less than a real new Occidental Schism. The Florence-Ferrara conception of Christian unity has led to the doctrine of the Vatical Council and will be of great importance at the council which has been announced by the present Pope. Together with our Roman Catholic brethren we are convinced that a clear understanding of the character of Christian unity must exist prior to all attempts at union or reunion of churches, prior as a condition and as an incentive those efforts.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    New York : Cambridge University Press
    Church history 29 (1960), S. 123-140 
    ISSN: 0009-6407
    Quelle: Cambridge Journals Digital Archives
    Thema: Geschichte , Theologie und Religionswissenschaft
    Notizen: Raymundus Lullus (Ramon Lull) tells of an educated Mohammedan ruler, who, when urged by a missionary to embrace the Christian faith, answered him: “Prove to me that your faith is true; then I, with all my subjects, shall adhere to it.” The missionary replied that Christian faith is too sublime a thing to be proved, and he contented himself with explaining the actual belief of the Christians. Answered the king: “If you ask me to leave what has been my faith thus far, then you should give me something reasonable instead of it.” Lull uses this story in order to warn missionaries among the Mohammedans not to follow such a method. According to him, it is useless and even ridiculous to refuse to discuss Christianity in philosophical terms in giving demonstrations of its truth to people who are acquainted with such a method.
    Materialart: Digitale Medien
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