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Dual-frequency ultrasound was used to extract liquiritin from licorice to obtain the optimum process parameters, which were ultrasonic time (A), ethanol volume ratio (B) and ultrasonic duty cycle (C). The prediction model of quadratic polynomial regression equation was obtained by Box-Behnken Design (BBD) and response surface methodology (RSM). The results showed that the optimal process parameters...
Aiming at the problem that the dual-frequency ultrasonic extraction of puerarin is difficult to detect effectively and efficiently with the method of manually watching and off-line detection, a method of soft sensor modeling is proposed. In the method, the genetic algorithm and the support vector machine (GA-SVM) are combined to build the soft measurement model of the puerarin extraction. By using...
We propose a graph matching based approach to identify multiple people in an indoor localization system by using the infrastructure camera along with microphone and speaker in a smart phone. Given a frame captured by the camera, an attributed graph is composed by considering each person in the frame as the vertice and the distance between people derived from the locations provided by the camera as...
Aiming at spherical co-oscillating vector hydrophone, this paper considered it as an elastic sphere vibrating freely underwater, and analyzed the characteristic of vector hydrophone's inner sound field, due to an incident train of plane wave. This paper used the finite element simulation software to analyze the vibration modes of elastic sphere, and summarized the influence of these results on the...
This paper schemed out an ophthalmic high frequency A-scan ultrasonic instrument to measure corneal thickness and ocular axial length, using pulse reflection principle and double counting method. A special ultrasonic high frequency transducer was designed to get higher resolution. In addition, differential circuit reduced the pulse width, thus improved the accuracy. From the results of comparative...
It is introduced that chlorogenic acid is extracted from the rattan of honeysuckle by using 57 KHz ultrasonic energy to ldquobreak up the cell wallrdquo and 20 KHz ultrasonic energy to produce ldquocavitationrdquo. And the development of the device, which is called double frequency ultrasonic and bidirectional turbulent extracting device, is introduced in the paper. It is indicated that the ultrasonic...
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