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  • Ethylene glycol mixtures  (1)
  • High-frequency hearing loss  (1)
  • 1
    Electronic Resource
    Electronic Resource
    ViscosityB-coefficients for lithium perchlorate in ethylene glycol-water mixtures (1987)
    Springer
    Monatshefte für Chemie 118 (1987), S. 197-202 
    Details
    ISSN: 1434-4475
    Keywords: B-Coefficient ; Lithium perchlorate ; Ethylene glycol mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die Dichten und Viskositäten für Lösungen von Lithiumperchlorat in verschieden zusammengesetzten Ethylenglykol-Wasser-Mischungen bei 25 °C und 35 °C gemessen. Auf Grund der erhaltenen Daten wurden dieB-Koeffizienten in den entsprechendenJones-Dole-Gleichungen für die relative Viskosität bestimmt. DieB-Werte hängen von der Zusammensetzung des Lösungsmittels ab und erreichen im wasserreichen Konzentrationsgebiet ein Maximum. Dieses Verhalten wird in Hinblick auf die Ionensolvatation und die Struktur des Lösungsmittels analysiert.
    Notes: Abstract Viscosities and densities of lithium perchlorate solutions in different ethylene glycol-water compositions have been measured at 25.0 and 35.0 °C. From these data, the correspondingB-coefficients of theJones-Dole equation have been determined. TheB-value depends on the solvent composition and it reaches a maximum in the water-rich region. This behaviour is analysed in terms of ionic solvation and solvent structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810052
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sensorineural high-frequency hearing loss after drill-generated acoustic trauma in tympanoplasty (1989)
    Springer
    European archives of oto-rhino-laryngology and head & neck 246 (1989), S. 280-282 
    Details
    ISSN: 1434-4726
    Keywords: High-frequency hearing loss ; High-frequency audiometry ; Acoustic trauma ; Tympanoplasty
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Tympanoplasty can cause a sensorineural hearing loss by a mechanism of acoustic trauma. Although this lesion appears to be relatively infrequent in clinical practice, we believe that its low apparent incidence is caused when clinicians fail to assess the auditory frequencies above 8000 Hz. Twenty-four patients with normal bone-conduction audiometric thresholds scheduled for tympanoplasty were assessed with an electro-stimulation, bone-conduction high-frequency audiometer which can measure hearing frequencies up to 20 kHz before and after surgery. A measurable hearing loss was found in the upper limits of the audible frequencies in 9 patients (37.5%), and was considered important in 4 of them (16.7%). This hearing loss was recorded above the upper frequency limit of conventional audiometers. The findings in this study indicate that drilling of the temporal bone can impair the hearing level in the high frequencies in a significant number of patients. High-frequency audiometry is a very sensitive tool to assess any damage caused to the inner ear by surgical procedures carried out in the middle ear and temporal bone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00463575
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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