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  • 1
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Hörstörung ; Prävalenz ; Konnatale Hörstörungen ; Erworbene Hörstörungen ; Progredienz ; Infektionen ; Kinder ; Keywords Hearing loss ; Prevalence ; Connatal hearing loss ; Acquired hearing loss ; Progressive hearing loss ; Infections ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract The results of international investigations on connatally acquired hearing loss are compared with the data of the German Registry on Childhood Hearing Loss (4058 cases). The connatal hearing disorders have shown a notable change in the last years regarding to aetiology and prevalence. In contrast to countries of the third world in developed nations the prevalence of permanent childhood hearing loss has been reduced down to 1 in 1.000 births. The results let assume a prevalence of approximately 1:1.200 births in Germany. For instance the number of rubella embryopathia decreased effectively. In contrast CMV infections and alcohol fetopathia are playing an increasing role. In the patients of the German Registry on Childhood Hearing Loss the percentage of certainly progressive hearing loss is 10.3 within the 4058 children with permanent hearing impairment. Diagnostic procedures first of all for the early diagnosis of CMV but also of toxoplasmosis are considerable because these infections may result in treatable hearing loss. Also consequent hearing tests are demanded in children with alcohol fetopathia.
    Notes: Zusammenfassung Im vorliegenden Beitrag werden die Daten internationaler Studien zu angeborenen erworbenen Hörstörungen mit den Ergebnissen aus 4058 Fällen im Deutschen Zentralregister für kindliche Hörstörungen (DZH) verglichen und ausgewertet. Die angeborenen Erkrankungen des Hörvermögens haben innerhalb der letzten Jahre bezüglich Ätiologie und Prävalenz einen deutlichen Wandel erlebt. Im Gegensatz zu Ländern der 3. Welt ist die Prävalenz permanenter kindlicher Hörstörungen in den westlichen Industrienationen auf ca. 1:1.000 gesunken. In Deutschland liegt die Prävalenz nach ersten Ergebnissen des DZH bei ca. 1,2:1.000. So ist beispielsweise der Anteil der Rötelnembryopathien stark zurückgegangen. Dagegen spielen heute die Zytomegalievirus-(CMV)-Infektion und die Alkoholfetopathie eine größere Rolle. Im Patientenkollektiv des DZH mit 4058 permanent hörgestörten Kindern beträgt der Anteil gesichert progredienter Verläufe 10,3%. Diagnostische Verfahren, vor allem zur Früherkennung von CMV und Toxoplasmose, gewinnen zunehmend an Bedeutung. Ebenso ist eine konsequente Hördiagnostik auch bei Kindern mit Alkoholfetopathie zu fordern.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International journal of infrared and millimeter waves 6 (1985), S. 1237-1254 
    ISSN: 1572-9559
    Keywords: gyrotron ; millimeter-wave ; microwave ; electron cyclotron resonance maser ; resonant cavities ; frequency tuning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The cavity of the University of Sydney gyrotron, GYROTRON IIIB, is split in two longitudinally to allow and frequency that lies between the fixed cavity resonances to be accessed by mechanically changing the separation of the two halves. The rate of change in resonant frequency with separation is greatest if the minor axis of the cavity cross-section is the one undergoing change. Results obtained with the latest cavity demonstrate this and show excellent agreement with theory.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of infrared and millimeter waves 3 (1982), S. 725-734 
    ISSN: 1572-9559
    Keywords: gyrotron ; millimeter-wave ; microwave cavities ; microwaves ; electron cyclotron maser
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the course of developing a low-power, tuneable millimeter-wave source, two gyrotrons have been constructed. Gyrotron I was a fixed-frequency device operating at 120 GHz while Gyrotron II produced more than 20 lines in the frequency range 130 to 260 GHz. The design of tuneable gyrotrons is discussed with reference to the Gyrotron II results.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    International journal of infrared and millimeter waves 4 (1983), S. 891-900 
    ISSN: 1572-9559
    Keywords: gyrotron ; millimeter-wave ; microwave ; electron cyclotron resonance maser ; frequency detuning ; frequency pulling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Frequency detuning in the University of Sydney Gyrotron II has been measured for a number of modes in the vicinity of the TE0 14 1 mode at 183 GHz. The main features of the observations agree with theory and the importance of a detailed knowledge of the electron velocity distribution and the cavity Q's is established.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    International journal of infrared and millimeter waves 6 (1985), S. 1255-1266 
    ISSN: 1572-9559
    Keywords: gyrotron ; millimeter-wave ; microwave ; electron cyclotron resonance maser ; mode conversion ; far-field imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The observed output power levels in the University of Sydney's gyrotron can be accounted for only by including the effects of mode conversion at waveguidetaper transitions in the vicinity of the resonant cavity. A series of measurements taken from liquid-crystal images of the microwave fields beyond the output window confirms this.
    Type of Medium: Electronic Resource
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