منابع مشابه
Gravitational Microlensing Near Caustics II: Cusps
We present a rigorous, detailed study of the generic, quantitative properties of gravitational lensing near cusp catastrophes. Concentrating on the case when the individual images are unresolved, we derive explicit formulas for the total magnification and centroid of the images created for sources outside, on, and inside the cusped caustic. We obtain new results on how the image magnifications ...
متن کاملSeismic detection of sonic booms.
The pressure signals from a sonic boom will produce a small, but detectable, ground motion. The extensive seismic network in southern California, consisting of over 200 sites covering over 50000 square kilometers, is used to map primary and secondary sonic boom carpets. Data from the network is used to analyze three supersonic overflights in the western United States. The results are compared t...
متن کاملSimulated Sonic Booms and Sleep : Effects of Repeated Booms of 1 . 0 Psf
Eight male subjects in each of three age groups (21-26, 40-45, 60-72 years) slept in pairs in the CAMI sonic boom simulation facility for 21 consecutive nights. The first five nights were used to acclimate the subjects (nights 1 and 2) and to obtain Baseline data (nights 3-5); the 12 subsequent nights (Boom) involved the hourly presentation of simulated sonic booms at an overpressure level of 1...
متن کاملA Loudness Calculation Procedure Applied to Shaped Sonic Booms
The economic viability of a supersonic commercial transport airplane would be much enhanced if it could fly supersonically over land. Efforts to design an airplane to produce a minimized sonic boom at the ground require knowledge of the impact of ,sonic booms on people. Loudness, being a fundamental and well-understood characteristic of human he_zrin9, was chosen as a means of quantifying the m...
متن کاملHuman Response to Sonic Booms-recent Nasa Research
1042 interviews were merged with the noise data in order to plot the reactions in each community against noise level. Figure 5 shows that at, for example, about DNL 25 to 35 dB(A), about 30 percent of the respondents said they were "very much" annoyed by sonic booms. These results can be directly compared with a 1985 survey of residents around five airports in the United Kingdom. Figure 5 indic...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1971
ISSN: 0001-4966
DOI: 10.1121/1.1977718