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The possibilities of using the total absorption method for plasma diagnosis are examined both in the case of weak and strong absorption and in the intermediate case. A formula is obtained for the last two cases by which the distribution of the concentration of atoms along the plasma radius can be determined. For diagnosis purposes the distribution along the line of sight of the width of the absorption line and the distribution along the plasma radius of the halfwidth of the thin layer line, which specifically can be found from the asymmetrical self-reversed lines, must be measured. The limits of the applicability of the method are discussed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 105–109, May, 1977. 相似文献
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Fishman YI Arezzo JC Steinschneider M 《The Journal of the Acoustical Society of America》2004,116(3):1656-1670
Auditory stream segregation refers to the organization of sequential sounds into "perceptual streams" reflecting individual environmental sound sources. In the present study, sequences of alternating high and low tones, "...ABAB...," similar to those used in psychoacoustic experiments on stream segregation, were presented to awake monkeys while neural activity was recorded in primary auditory cortex (A1). Tone frequency separation (AF), tone presentation rate (PR), and tone duration (TD) were systematically varied to examine whether neural responses correlate with effects of these variables on perceptual stream segregation. "A" tones were fixed at the best frequency of the recording site, while "B" tones were displaced in frequency from "A" tones by an amount = delta F. As PR increased, "B" tone responses decreased in amplitude to a greater extent than "A" tone responses, yielding neural response patterns dominated by "A" tone responses occurring at half the alternation rate. Increasing TD facilitated the differential attenuation of "B" tone responses. These findings parallel psychoacoustic data and suggest a physiological model of stream segregation whereby increasing delta F, PR, or TD enhances spatial differentiation of "A" tone and "B" tone responses along the tonotopic map in A1. 相似文献