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  • Acoustics  (1)
  • Memory Disorders/*physiopathology  (1)
  • Memory/drug effects  (1)
  • 1
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    Unknown
    American Association for the Advancement of Science (AAAS)
    Publication Date: 1982-07-30
    Description: Biochemical, electrophysiological, and pharmacological evidence supporting a role for cholinergic dysfunction in age-related memory disturbances is critically reviewed. An attempt has been made to identify pseudoissues, resolve certain controversies, and clarify misconceptions that have occurred in the literature. Significant cholinergic dysfunctions occur in the aged and demented central nervous system, relationships between these changes and loss of memory exist, similar memory deficits can be artificially induced by blocking cholinergic mechanisms in young subjects, and under certain tightly controlled conditions reliable memory improvements in aged subjects can be achieved after cholinergic stimulation. Conventional attempts to reduce memory impairments in clinical trials hav not been therapeutically successful, however. Possible explanations for these disappointments are given and directions for future laboratory and clinical studies are suggested.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bartus, R T -- Dean, R L 3rd -- Beer, B -- Lippa, A S -- New York, N.Y. -- Science. 1982 Jul 30;217(4558):408-14.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7046051" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholine/metabolism ; Adult ; Aged ; Aging ; Alzheimer Disease/physiopathology ; Animals ; Brain Chemistry ; Choline/metabolism ; Choline O-Acetyltransferase/metabolism ; Cognition ; Forecasting ; Humans ; Memory/drug effects ; Memory Disorders/*physiopathology ; Mice ; *Models, Neurological ; Parasympathetic Nervous System/*physiopathology ; Parasympathomimetics/pharmacology ; Phosphatidylcholines/metabolism ; Rats ; Receptors, Muscarinic/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2019-07-13
    Description: The ability to design, build and test miniaturized acoustic treatment panels on scale model fan rigs representative of full scale engines provides not only cost-savings, but also an opportunity to optimize the treatment by allowing multiple tests. To use scale model treatment as a design tool, the impedance of the sub-scale liner must be known with confidence. This study was aimed at developing impedance measurement methods for high frequencies. A normal incidence impedance tube method that extends the upper frequency range to 25,000 Hz. without grazing flow effects was evaluated. The free field method was investigated as a potential high frequency technique. The potential of the two-microphone in-situ impedance measurement method was evaluated in the presence of grazing flow. Difficulties in achieving the high frequency goals were encountered in all methods. Results of developing a time-domain finite difference resonator impedance model indicated that a re-interpretation of the empirical fluid mechanical models used in the frequency domain model for nonlinear resistance and mass reactance may be required. A scale model treatment design that could be tested on the Universal Propulsion Simulator vehicle was proposed.
    Keywords: Acoustics
    Type: NASA/CR-2003-212428/PHASE2 , NAS 1.26:212428/PHASE2
    Format: application/pdf
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