نتایج جستجو برای: acoustic properties
تعداد نتایج: 947693 فیلتر نتایج به سال:
Accurate discrimination of NASH from simple steatsois (fatty liver) is a critical issue in current clinical practice because it may progress to cirrhosis or even liver cancer[1]. Although the precise mechanisms of NASH remain unclear, some reports have shown differences in the content of free fatty acid (FFA) between controls and NASH[2][3]. Thus, an ultrasound-based diagnostic technique of NAS...
In medical ultrasound transducers, the transmission mode (pass-through) approach has been used to estimate the characteristics of the acoustic lens. However, it is difficult to measure the acoustic lens properties with high precision because of human, systemic, or mechanical measurement errors. In this paper, we propose a low-cost estimation instrument for acoustic lens properties connected wit...
The acoustic impedance at the diaphragm of an electroacoustic transducer can be modified using a range of active control strategies, amongst which is “direct impedance control”. This technique employs a combination of feedbacks, one on the acoustic pressure and the other on the diaphragm velocity, to the loudspeaker electric terminals, allowing significant modifications of the acoustic resonato...
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