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Zan Wang,Chaofei Gao,Liwei Zheng,Jikun Ren,Wei Wang,Yushuai Zhang,Shijie Han 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.1
Ultrasonic signals will be generated when partial discharge occurs in internal insulation faults in large oil immersed power transformers: because the ultrasonic signal has strong anti-interference ability and has no direct electromagnetic contact with the equipment, it is widely used in transformer fault detection and positioning. In this paper, the fi nite element method (FEM) is used to simulate the ultrasonic signal in a 35 kV power transformer. The infl uence of transformer case on ultrasonic signal propagation is considered, and the propagation law of the ultrasonic signal inside the transformer is obtained. Fabry–Pérot (F–P) fi bre acoustic sensors with a centre frequency of 28 kHz were fabricated. A partial discharge detection test was carried out in a 35 kV transformer winding model using the F–P sensors. The test results show that the ultrasonic waveform detected by the F–P sensors are in good agreement with the simulation results, and the propagation of the ultrasonic wave inside the transformer is verifi ed. It lays a foundation for detecting and locating PDs in power transformer by F–P acoustic sensors.
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Hui Ji,Hui Wang,Qiumei Ji,Winbo Ji,Xiaolin Luo,Jiabo Wang,Zhixin Chai,Jinwei Xin,Xin Cai,Zhijuan Wu,Jikun Wang,Jincheng Zhong 한국유전학회 2020 Genes & Genomics Vol.42 No.11
Background miRNAs play an important role in regulating normal animal development. Muscle tissue and fat metabolismare important for maintaining energy balance in animals. Yak has important agricultural and economic importance as itprovides milk, meat, and hair. It is used for transportation as well. However, the miRNA expression profiles of their muscleand adipose tissue are currently unknown. Objective To explore the regulatory roles of miRNAs in the skeletal muscle and adipose tissues of yak. Methods A total of 12 small RNA libraries were constructed from the skeletal muscle and adipose samples from yak aged 0.5,2.5, 4.5, and 7.5 years. High-throughput sequencing and bioinformatics analysis were used to determine the dynamic expressionprofile of miRNA, and a miRNA regulatory network related to muscle and adipose tissue development was established. Results miR-1-3p and miR-143-3p showed the highest expression during yak skeletal muscle and fat development, respectively. The MAPK and Ras signaling pathways were the pivotal pathways. miR-181-5p, miR-542-3p, and miR-424-5p mayhave key roles in skeletal muscle development, and CREBRF, GRB10, CDK1, RFX3, and EPC2 were the core target genes. While miR-127-5p, miR-379-3p, and miR-494-3p may play important regulatory roles in adipose deposition, and ETV1,XPO7, and C5AR2 were the core target genes. Conclusion This study provides valuable resources for further study of the molecular mechanisms underlying yak skeletalmuscle and adipose tissue development, and also a basis for studying the interactions between genes and miRNAs.
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