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- 저자 : Ren Lixia (검색결과 5 건)
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High-voltage DC–DC converter based on adaptive frequency conversion modulation
Lixia Zheng,Yi Zhu,Jie Ren,Changyuan Chang,Jialing Ye 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.3
With the development of electric vehicles, the demand for the high-voltage low-current DC-DC chips used in vehicle on-board equipment continues to grow. To improve the effi ciency of the switching power supply, an asynchronous buck high-voltage DC-DC converter with adaptive variable frequency modulation (AVFM) technology is designed in this paper. This work focuses on the efficiency optimization of the buck converter, and the relationship between power consumption and operating frequency under different loads. The optimal frequency range is selected during light and heavy loads, and adaptive transition of the frequency is realized during a medium load. Using a threshold voltage ( V th_cs ) circuit with an adjustable current inside the chip, the on-time of the switch is changed to realize frequency conversion. The whole chip design is based on 0.35 μm BCD process, in which the integrated LDMOS can withstand 200 V. System simulations are completed in Cadence. The results show that when the input voltage is 30–60 V and the output specifi cation is 5 V/0.5 A, the system realizes adaptive frequency conversion in the entire load range, and the efficiency reaches 88.9%. The actual performance of the chip meets the design requirements and has good EMI characteristics.
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Yi Ren,Yu Nie,Wei Ran,Zhuofan Liu,Lixia Wang,Chao Lou,Wei Chen 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.2
Lattice structures with excellent mechanical performance can be achieved through delicate design. In this work, inspired bythe soft–hard multiphase crystals, three types of dual phase lattice structures (DPLS) composed of body-centered cubic withZ-struts (BCCZ) matrix phase and face and body-centered cubic with Z-struts (FBCCZ) reinforcement phase were designedand fabricated by selective laser melting (SLM) using 316L stainless steel powder. Quasi-static compression experimentand numerical simulation were carried out to investigate their mechanical properties, energy absorption and deformationbehavior. The results showed that the mechanical properties of all DPLS samples were higher than that of single phaseBCCZ lattice structure. The four-body diagonal DPLS sample exhibited the highest specific strength and specific stiffness,which was 9.0% and 14.2% higher than single phase BCCZ lattice structure; while, the two-face diagonal DPLS sample hadthe highest specific energy absorption value of 17.45 J/g. Besides, the experimental and simulated results revealed that thearrangements and volume fraction of reinforcement phase had a significant impact on the performance, deformation behaviorand internal stress distribution of the DPLS samples during compressive deformation.
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Chen Lihua,Ren Lixia,Dongna Li,Xia Ma 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.1
To understand the effect of microbial communityon the flavor of fermented rice wine, microbiomes inthree traditional starters (CMQ, NBQ, and YCQ) fromdifferent origins for making Chinese rice wines wereevaluated and the volatile components of their rice wineswere compared. The results showed that the dominantgenera in CMQ were Pantoea, Bacillus, Rhizopus, andCandida, the dominant microorganisms in NBQ were Pediococcus,Lactobacillus, Acetobacter, Weissella, Bacillus,Rhizopus, Candida, and Aspergillus, the dominantmicroorganisms in YCQ were Pediococcus, Lactobacillus,Leuconostoc, Weissella, Lactococcus, Ochrobactrum,Rhizopus, and Mucor. There were significant differences insensory properties of the wines brewed by three starters. Although the major aroma components were benzyl alcohol,2-octanone, benzoic acid, and phenethyl acetate, eachrice wine had its own main aroma components include1-octanol, 1-pentanol, ethyl acetate, etc. The resultsshowed that the different microbial communities in starterresults in the significant difference of the aroma componentsin its fermented rice wine.
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Molecular detection and genetic diversity of bovine papillomavirus in dairy cows in Xinjiang, China
Qingling Meng,Chengcheng Ning,Lixia Wang,Yan Ren,Jie Li,Chencheng Xiao,Yanfang Li,Zhiyuan Li,Zhihao He,Xuepeng Cai,Jun Qiao 대한수의학회 2021 Journal of Veterinary Science Vol.22 No.4
Background: Bovine papillomatosis is a type of proliferative tumor disease of skin and mucosae caused by bovine papillomavirus (BPV). As a transboundary and emerging disease in cattle, it poses a potential threat to the dairy industry. Objectives: The aim of this study is to detect and clarify the genetic diversity of BPV circulating in dairy cows in Xinjiang, China. Methods: 122 papilloma skin lesions from 8 intensive dairy farms located in different regions of Xinjiang, China were detected by polymerase chain reaction. The genetic evolution relationships of various types of BPVs were analyzed by examining this phylogenetic tree. Results: Ten genotypes of BPV (BPV1, BPV2, BPV3, BPV6, BPV7, BPV8, BPV10, BPV11, BPV13, and BPV14) were detected and identified in dairy cows. These were the first reported detections of BPV13 and BPV14 in Xinjiang, Mixed infections were detected, and there were geographical differences in the distribution of the BPV genotypes. Notably, the BPV infection rate among young cattle (< 1-year-old) developed from the same supply of frozen sperm was higher than that of the other young cows naturally raised under the same environmental conditions. Conclusions: Genotyping based on the L1 gene of BPV showed that BPVs circulating in Xinjiang China displayed substantial genetic diversity. This study provided valuable data at the molecular epidemiology level, which is conducive to developing deep insights into the genetic diversity and pathogenic characteristics of BPVs in dairy cows.
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