Results 171 to 180 of about 890 (213)
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The Journal of the Acoustical Society of America, 1994
Recent work in ocean acoustic tomography indicates that acoustic waves propagating global distances contain planetary-scale information [A. B. Baggeroer and W. Munk, Phys. Today 45(9), 22–30 (1992)]. The expected collision of the fragments of comet Shoemaker–Levy 9 with Jupiter in July [J. K. Beatty and D. H.
Michael D. Collins +3 more
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Recent work in ocean acoustic tomography indicates that acoustic waves propagating global distances contain planetary-scale information [A. B. Baggeroer and W. Munk, Phys. Today 45(9), 22–30 (1992)]. The expected collision of the fragments of comet Shoemaker–Levy 9 with Jupiter in July [J. K. Beatty and D. H.
Michael D. Collins +3 more
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Scientific American, 1990
Oceanographers have borrowed a technique from physicians for studying deep-sea currents and temperatures. The method is tomography. Instead of X rays, researchers use sound to create three-dimensional images of the waters that cover 70 percent of the earth's surface and strongly influence its climate.
Robert C. Spindel, Peter F. Worcester
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Oceanographers have borrowed a technique from physicians for studying deep-sea currents and temperatures. The method is tomography. Instead of X rays, researchers use sound to create three-dimensional images of the waters that cover 70 percent of the earth's surface and strongly influence its climate.
Robert C. Spindel, Peter F. Worcester
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Signal Recovery and Synthesis, 1998
Ocean acoustic tomography (OAT) is a method proposed by Munk and Wunsch (1979) to observe the ocean using acoustic transmissions. Although the ocean is nearly opaque to most electromagnetic radiation, acoustic waves propagate well, and low frequencies (less than 100 Hz) can propagate usefully for more than 10 megameters (Munk, Worcester, and Wunsch ...
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Ocean acoustic tomography (OAT) is a method proposed by Munk and Wunsch (1979) to observe the ocean using acoustic transmissions. Although the ocean is nearly opaque to most electromagnetic radiation, acoustic waves propagate well, and low frequencies (less than 100 Hz) can propagate usefully for more than 10 megameters (Munk, Worcester, and Wunsch ...
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Acoustic Tomography with Navy Sonars
1997Abstract : Data will be collected from a variety of Navy sonars. Traditional means to process the signals will be done including beamforming, coherent averaging (when dealing with periodic signals), correcting for Doppler shifts (when dealing with mobile sonars), and matched filtering (when a replica with the emitted waveform is available).
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Surface suspended acoustic receiver for acoustic tomography
The Journal of the Acoustical Society of America, 1995A surface suspended acoustic receiver (SSAR) is shown capable of processing and transmitting acoustic tomography data through ARGOS to laboratories in near-real time. Ray theory is shown adequate for validating the data from the SSAR. [Work supported by the Strategic Environmental Research and Development Program, managed by the Advanced Research ...
John S. Spiesberger +2 more
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Diagnosis of acoustic neuroma with computed tomography
Neuroradiology, 1978Sixty-one acoustic neuromas were examined with computed tomography (CT). For differential diagnosis the tumors were thoroughly analyzed for manner of growth, shape, volume, calcification, attenuation pattern, constrast enhancement, presence of peripheral edema, and cisternal deformation.
A, Möller, A, Hatam, H, Olivecrona
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A parallel processing approach to acoustic tomography
The Journal of the Acoustical Society of America, 1992Acoustic tomography is a widely utilized technique to reconstruct material properties from global wave propagation data. One of the main drawbacks to using tomography is the computationally intensive nature of the reconstruction algorithm. In this work, a new computational approach to acoustic tomography is presented using a computer with a massively ...
C. SULLIVAN +3 more
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Liquid acoustic lens for photoacoustic tomography
Optics Letters, 2013Recently, intensive research has been conducted to accelerate the development of photoacoustic (PA) imaging modality for biomedical applications. The use of acoustic lenses to collect ultrasound signals is of great interest. This Letter presents the design and fabrication of a liquid acoustic diverging lens, which can enlarge the acceptance angle of an
Chaolong, Song, Lei, Xi, Huabei, Jiang
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Computed tomography for small acoustic neuromas
Neuroradiology, 1978The minimal size of acoustic neuromas detectable by computered tomography (CT) is, according to the available literature, 1.5 to 2 cm. The new otoneurosurgical technic using the transtemporal and translabyrinthine approach necessitates an early diagnosis of neuromas protruding 1 cm or less into the cerebellopontine angle cistern. This seemed impossible
O, Schubiger, A, Valavanis, H, Menges
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