Results 251 to 260 of about 242,502 (308)
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Ultrasonic Detection of Nonopaque Renal Calculi
Radiology, 1978Four patients with 5 nonopaque renal calculi composed of uric acid were examined by ultrasound. The calculi varied in size from a 1.5 X 1.5-cm intrapelvic stone to a staghorn calculus measuring 4 cm. All stones were satisfactorily imaged by ultrasound, allowing a diagnosis of nephrolithiasis to be made with confidence in each case.
H M, Pollack +3 more
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Antepartum Ultrasonic Detection of Multicystic Kidney
Radiology, 1979A multicystic fetal kidney was detected antepartum with gray-scale ultrasound. This appears to be the first proved case.
J E, Friedberg, J S, Mitnick, D A, Davis
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Ultrasonic position detecting system
The Journal of the Acoustical Society of America, 1985A system measures the (x, y) coordinates of a target, for example, a pointed finger on a flat surface such as a rectangular plate. A pair of ultrasonic transducers are placed on the plate so that one transducer is located at each of the two left corners of the plate or at each of the two top corners of the plate.
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Ultrasonic Detection Of Mine Fires
12th WVU International Mining Electrotechnology Conference, 2005A commercially-available, acoustic ranging system demonstrated its capability to detect the occurrence of an experimental fire and concentrated smoke in a mine entry. This ranging system provided a temperature and smoke sensing method over a path between the system and a reflecting surface in the mine.
G.F. Friel, J.C. Edwards
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Ultrasonic motion detection system
The Journal of the Acoustical Society of America, 1987A control circuit (16) mounted on a faucet (10) operates an ultrasonic transducer (20) that transmits ultrasound into a target region (22) below the outlet (24) of the faucet. The control circuit receives electrical signals from the transducer when the transducer receives echoes from objects within the target region.
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Ultrasonic damage detection with WPT
2014 11th International Computer Conference on Wavelet Actiev Media Technology and Information Processing(ICCWAMTIP), 2014Non-destructive evaluation technique has been proved to be able to identify microscopic material degradation based on various nonlinear effects of ultrasonic wave propagation in structures. Wavelet transform becomes a promising method, due to its ability to analyze signal with multi-resolution.
Ping Fan, Xinbao Liu
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Defect detection in ultrasonic images
Fourth IEEE Region 10 International Conference TENCON, 1989The detection and characterization of defects contained in aircraft parts made of carbon composites using ultrasonic image analysis based on contour and region based segmentation methods is discussed. The experimental and analytical results show that the problems encountered in ultrasonic images are varied and require the use of different approaches ...
E.J. D'Sa, K.R. Ramakrishnan, P. Krause
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Ultrasonic detection of insulation degradation
IEE Proceedings A (Physical Science, Measurement and Instrumentation, Management and Education), 1990The application of ultrasonic nondestructive testing techniques to the detection of insulation degradation has been investigated in a variety of polyester samples. Some samples contained inclusions such as needles and small steel ball-bearings.
D.W. Auckland, B.R. Varlow, D. Maloney
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Gaussian transducer for ultrasonic detection
The Journal of the Acoustical Society of America, 1990For improved ultrasonic detection (nondestructive evaluation, NDE), an ultrasonic beam with weaker sidelobes and absence of amplitude nulls in the nearfield is desired. This goal can be accomplished by reconstructing the back electrode of a conventional transducer, such that the vibration amplitudes on the transducer surface exhibit a Gaussian ...
Zhen Wu +3 more
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The ultrasonic detection of platelet aggregates
Thrombosis Research, 1987The echogenicity of platelet aggregates in platelet-rich plasma and whole blood was evaluated in stirring and flowing in vitro models. Real-time two dimensional ultrasonic images were obtained with transducers operating at 3.0, 5.0, 10 and 12 mHz. Platelet-rich plasma was not echogenic.
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