Abstract In order to provide design parameters for the micro-initiation train of built-in MEMS Safety and Arming Device, solve reliable transmission problem due small charge amount. Based on structure micro initiating explosive sequence, test device is designed in paper. The photon Doppler Velocimeter (PDV) was used velocity flyer driven by micro-detonator, influence flyer, acceleration chamber...

Non-invasive ultrasonic imaging of the carotid bifurcation by duplex scanning and ultrasonic arteriography combined with pulsed Doppler spectrum analysis demonstrated patency of the external and internal carotid arteries distal to a common carotid occlusion in 3 patients. Common carotid occlusion is not invariably associated with thrombosis of the ipsilateral internal carotid artery. Identifica...

INTRODUCTION Serial monitoring of patients participating in clinical trials of carotid artery therapy requires noninvasive precision methods that are inexpensive, safe and widely available. Noninvasive ultrasonic duplex Doppler velocimetry provides a precision method that can be used for recruitment qualification, pre-treatment classification and post treatment surveillance for remodeling and r...

An ultrasound instrument has been developed that combines a real-time cross-sectional imaging system and a spectrum analyzer-based Doppler velocimeter. This combination allows the Doppler sample volume to be superimposed on the cross-sectional image of the heart so that the sample volume can be located accurately. The same 2.2 MHz transducer utilized for cross-sectional imaging is stopped mecha...

This report introduces an approach to recognize hand gestures by utilizing the Doppler effect of ultrasonic soundwaves. I use a microphone array as the receivers and two speakers as the transmitters to generate ultrasonic soundwaves. Gestures are characterized through the Doppler frequency shift they generate in reflections of the soundwaves. I then apply the artificial neural network algorithm...

Investigation in the postoperative period of 75 patients by means of the radioiodinated fibrinogen uptake method, by the use of the Doppler ultrasonic flow detector, and by clinical assessment revealed an incidence of deep vein thrombosis of only 12%. This is distinctly lower than has been reported by other investigators using the same techniques both in Australia and elsewhere. It appears from...

A physical model of gabion overflow dams was studied to determine the velocity profile and Reynolds shear stress. Physical tests were done under two different conditions of dam crest, overflow dams with impermeable and with permeable crests. Instantaneous velocity components over dam crest were measured by an ADV (Acoustic Doppler Velocimeter) instrument. This instrument is capable of measuring...