A drive circuit of MOSFET for ultrasonic power

In order to remove the flocculent precipitation in Huyou juice after frozen storage and thawing process, the thawed juice was ultrasonically treated with different power (45–360 W) and time (10–60 min) in ice bath (~0 °C), and its sedimentation behavior during storage was observed. After optimization, the cloud stability of juice could be improved by ultrasonic treatment with ultrasonic power of 360 W or more for at least 30 min, which could be stable during 7 days of storage at 4 °C. Under this optimal condition (360 W, 30 min), the effects of ultrasound on the physicochemical properties and bioactive compounds of thawed Huyou juice during storage were investigated. The results showed that with smaller particle size and lower polymer dispersity index, ultrasonic treatment did not significantly change the color, soluble solids, titratable acidity, and bioactive compounds including flavonoids and other phenolics. In addition, all properties of samples were at the same level during storage. Thus, ultrasound was applicable since it can improve the cloud stability of Huyou juice with minimal impact on its physicochemical properties and nutritional quality compared to the untreated one.

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Switching Process Analysis and Drive Circuit Simulation of SiC MOSFET in Dynamic Wireless Charging for Electric Vehicles

2020 16th International Conference on Control, Automation, Robotics and Vision (ICARCV) ◽

10.1109/icarcv50220.2020.9305420 ◽

2020 ◽

Author(s):

Zongwen Li ◽

Rong Long ◽

Liyan Zhang ◽

Qihong Chen

Keyword(s):

Electric Vehicles ◽

Process Analysis ◽

Circuit Simulation ◽

Switching Process ◽

Wireless Charging ◽

Drive Circuit

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Ultrasonic power combined with seed materials for recovery of phosphorus from swine wastewater via struvite crystallization process

Journal of Environmental Management ◽

10.1016/j.jenvman.2021.112961 ◽

2021 ◽

Vol 293 ◽

pp. 112961

Author(s):

Qian Guan ◽

Guisheng Zeng ◽

Jiatian Song ◽

Chunli Liu ◽

Zhongbing Wang ◽

...

Keyword(s):

Crystallization Process ◽

Swine Wastewater ◽

Ultrasonic Power ◽

Struvite Crystallization

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A Novel Gate Drive Circuit for Suppressing Turn-on Oscillation of Non-Kelvin Packaged SiC MOSFET

Energies ◽

10.3390/en14092449 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2449

Author(s):

Hongyan Zhao ◽

Jiangui Chen ◽

Yan Li ◽

Fei Lin

Keyword(s):

Thermal Conductivity ◽

Breakdown Voltage ◽

Basic Principle ◽

Double Pulse ◽

Experimental Results ◽

Switching Frequency ◽

Turn On ◽

Proof Testing ◽

Gate Driver ◽

Drive Circuit

Compared with a silicon MOSFET device, the SiC MOSFET has many benefits, such as higher breakdown voltage, faster action speed and better thermal conductivity. These advantages enable the SiC MOSFET to operate at higher switching frequencies, while, as the switching frequency increases, the turn-on loss accounts for most of the loss. This characteristic severely limits the applications of the SiC MOSFET at higher switching frequencies. Accordingly, an SRD-type drive circuit for a SiC MOSFET is proposed in this paper. The proposed SRD-type drive circuit can suppress the turn-on oscillation of a non-Kelvin packaged SiC MOSFET to ensure that the SiC MOSFET can work at a faster turn-on speed with a lower turn-on loss. In this paper, the basic principle of the proposed SRD-type drive circuit is analyzed, and a double pulse platform is established. For the purpose of proof-testing the performance of the presented SRD-type drive circuit, comparisons and experimental verifications between the traditional gate driver and the proposed SRD-type drive circuit were conducted. Our experimental results finally demonstrate the feasibility and effectiveness of the proposed SRD-type drive circuit.

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Optimization of Ultrasonic-Assisted Extraction, Characterization, and Antioxidant Activities of Polysaccharides From Sojae Semen Praeparatum

Natural Product Communications ◽

10.1177/1934578x211020622 ◽

2021 ◽

Vol 16 (5) ◽

pp. 1934578X2110206

Author(s):

Yongshuai Jing ◽

Ruijuan Zhang ◽

Lan Li ◽

Danshen Zhang ◽

Yu Liu ◽

...

Keyword(s):

Antioxidant Activities ◽

Deae Cellulose ◽

Chemical Compositions ◽

Hydroxyl Groups ◽

Ultrasonic Frequency ◽

Ultrasonic Power ◽

Assisted Extraction ◽

Ultrasonic Time ◽

Ultrasonic Assisted ◽

Ultrasonic Assisted Extraction

In this study, response surface methodology (RSM) was used to optimize the ultrasonic-assisted extraction parameters of Sojae Semen Praeparatum polysaccharides (SSPP-80), the optimum conditions were determined as follows: ultrasonic frequency of 100 W, ultrasonic power of 80 Hz, ultrasonic temperature of 52℃, ultrasonic time of 23 minutes, and liquid to raw material ratio of 40 mL/g. Based on these conditions, polysaccharides extraction rate was 7.72% ± 0.26%. Then, 2 novel polysaccharides (SSPP-80‐1, SSPP-80‐2) were isolated from SSPP by DEAE-cellulose 52 chromatography. The chemical compositions, physicochemical properties, and structure of SSPPs were investigated by simultaneous thermal analyzer (TGA), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FI-IR), and high-performance liquid chromatography (HPLC). The results showed that SSPP-80 and 2 fractions were mainly composed of mannose (Man), glucose (Glc), galactose (Gal), xylose (Xyl), and arabinose (Ara). In addition, the antioxidant activities were evaluated against the DPPH and hydroxyl radical in vitro, the IC50 of SSPP-80, SSPP-80‐1 and SSPP-80‐2 against DPPH free radical were 4.407, 8.267, and 5.204 mg/mL, respectively, whereas the IC50values for removing hydroxyl groups were 5.318, 3.516, and 4.016 mg/mL, respectively. It demonstrated that SSPP-80 and 2 fractions had certain antioxidant activity. Theoretical basis for use of Sojae Semen Praeparatum polysaccharides was provided by this study.

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