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- 저자 : Bingjie Yang (검색결과 3 건)
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Improved SVPWM modulation method for three‑phase dual‑input dual‑buck inverters
Yongshuai Wang,Hongjuan Ge,Hang Yin,Bingjie Wu,Fan Yang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.5
The traditional modulation method for three-phase dual-input dual-buck inverters is level-shifted sine pulse width modulation. The disadvantage of this method is that the dc voltage utilization ratio is low and the software fault tolerance is difficult to realize. To solve these problems, an improved SVPWM suitable for this inverter is proposed in this paper. By analyzing the switch modes and bridge arm midpoint level of this inverter, 27 voltage vectors are obtained. According to the obtained long vector cluster, medium vector cluster, and short vector cluster, six modulation sectors are obtained, and each modulation sector has four modulation regions. When the voltage of the inverter low-voltage dc source changes, the associated vector changes as well. How the modulation region changes when the associated vector changes is analyzed. The action time of each vector in each modulation region is deduced. In addition, the action order of each vector involved in vector synthesis is optimized. A 2 kW prototype was built to carry out experimental research. Experimental results show that this modulation method improves the dc voltage utilization ratio, reduces the loss, and improves the efficiency of the inverter.
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Baoping Guo,Zhuangzhi Zhang,Xueting Zheng,Yongzhong Guo,Li Zhao,Ren Cai,Bingjie Wang,Mei Yang,Xi Shou,Wenbao Zhang,Bin Jia 대한기생충학ㆍ열대의학회 2019 The Korean Journal of Parasitology Vol.57 No.2
Echinococcus granulosus is an important zoonotic parasite globally causing cystic echinococcosis (CE) in hu- mans and animals. In this study, prevalence of CE and variation of cox1 gene sequence were analyzed with isolates E. granulosus collected from different areas in northern Xinjiang, China. The survey showed that 3.5% of sheep and 4.1% of cattle were infected with CE. Fragment of cox1 was amplified from all the positive sheep and cattle samples by PCR. In addition, 26 positive samples across the 4 areas were included. The isolates were all E. granulosus sensu stricto (s.s.) containing 15 haplotypes (Hap1-15), and clustered into 2 genotypes, G1 (90.1%, 91/101) and G3 (9.9%, 10/101). Hap1 was the most common haplotype (48.5%, 49/101). Hap9 were found in humans samples, indicating that sheep and cattle reservoir human CE. It is indicate that E. granulosus may impact on control of CE in livestock and humans in the region.
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Chuanhe Li,Ruiqi Shao,Chunhong Wang,Guangwei Fu,Bingjie Yang 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10
Quality characteristics of blended yarns, which play an important role in textile quality, are continually assessed by softness, breaking strength, breaking elongation, hairiness, irregularity, etc. In this study, hemp was softened and blended with other cellulose fibers with better softness to produce yarns. The softness of hemp is obviously lower than that of the other two fibers. With the increase of hemp fiber percentage content, the yarn properties deteriorated. Therefore, the softening treatment of hemp fiber is very necessary. Moreover, the blending hemp, cotton, and viscose in the yarn structure provided synergies, improving the weak properties of ternary fibers. Results show that softening treatment and lower percentage content of the hemp fiber will result in better yarn quality, which is consistent with the derivation result of the bending theoretical model. When the percentage content of treated hemp is 40 wt%, the overall performance of blended yarn is the best. Compared with the untreated hemp-based ternary blended yarns, the hairiness of blended yarn is significantly less (3.65 ends/m, compared to 12.23 ends/m), and the irregularity of yarn is lower (27.33% and 27.70%, respectively), yarn quality improved considerably. In addition, the resulting hemp yarn showed antibacterial activity against Escherichia coli and Staphylococcus aureus.
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