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Wit-Rusland: dictatuur en legitimiteit tussen Rusland en Europa
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Beyond 'Pluralism'
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제품 디자인에 귀여운 문화의 적용과 연구
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유형론적으로 유사한 제2언어의 선행 학습경험이 제3언어로서의 한국어 습득에 미치는 효과 연구
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Contested territory: American film spectatorship^ colonial mimicry and British Empire
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Evaluation of surgical outcomes between isolated hepaticojejunostomy reconstructions versus conventional reconstruction after pancreaticoduodenectomy
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- 저자 : Ding Xinping (검색결과 5 건)
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High step-up three-level DC-DC converter with three-winding coupled-inductor
Ding, Xinping,Zhao, Delin,Liu, Yun,Li, Kai,Hao, Yangyang The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.1
Due to the wide adoption of photovoltaic power generation, non-isolated high step-up DC-DC converters are becoming more and more popular. Among these converters, the switched/coupled-inductor-based converter is more attractive due to the fact that it has fewer power devices and a high efficiency. This paper presents a three-level high step-up DC-DC topology with a three-winding coupled-inductor. When compared with a conventional switched/coupled-inductor-based converter, a higher efficiency can be achieved, owing to low voltage stresses devices, fewer semiconductors in the power loop, lower current stresses, and ZCS of the main switches. The operating principle of the proposed topology is analyzed in detail via equivalent circuits, where a theoretical analysis is carried out using state space modelling. Experimental results obtained on a 24-300 V, 360 W lab prototype have verified the excellent performance of the proposed DC-DC converter.
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( Hui Li ),( Jun Huang ),( Xinping Liu ),( Rongqing Zhou ),( Xiaofei Ding ),( Qianyin Xiang ),( Liqiang Zhang ),( Chongde Wu ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.1
It is vital to understand the changing characteristics of interphase microbial communities and interspecies synergism during the fermentation of Chinese liquors. In this study, microbial communities in the three indispensable phases (pit mud, zaopei, and huangshui) of Luzhou-flavored liquor manufacturing pits and their shifts during cellars use were first investigated by polyphasic culture-independent approaches. The archaeal and eubacterial communities in the three phases were quantitatively assessed by combined phospholipid ether lipids/ phospholipid fatty acid analysis and fluorescence in situ hybridization. In addition, qualitative information regarding the microbial community was analyzed by PCR-denaturing gradient gel electrophoresis. Results suggested that the interphase microbial community profiles were quite different, and the proportions of specific microbial groups evolved gradually. Anaerobic bacteria and gram-positive bacteria were dominant and their numbers were higher in pit mud (10<sup>9</sup> cells/g) than in huangshui (10<sup>7</sup> cells/ml) and zaopei (10<sup>7</sup>cells/g). Hydrogenotrophic methanogenic archaea were the dominant archaea, and their proportions were virtually unchanged in pit mud (around 65%), whereas they first increased and then decreased in zaopei (59%-82%-47%) and increased with pit age in huangshui (82%-92%). Interactions between microbial communities, especially between eubacteria and methanogens, played a key role in the formation of favorable niches for liquor fermentation. Furthermore, daqu (an essential saccharifying and fermentative agent) and metabolic regulation parameters greatly affected the microbial community.
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A High Step-up DC-DC Converter with Multiplier Voltage Cells
Song Liye,Tian Guosheng,Peng Jishen,Ding Xinping 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1
The non-isolated high voltage gain dc-dc converter becomes the focus of research in the sustainable energy converters. This paper proposes a high step-up dc-dc converter with switched-capacitor and 3-winding coupled inductor. It consists of voltage multiplier cell, coupled inductor, and switched-capacitor. Compared with existing high step-up dc-dc converters, the proposed converter incorporates a switched-capacitor at the output side of the converter, which has a lower impulse current and power loss due to the current limiting efect of magnetic element. Therefore, it makes full use of the boosting capability of the switched-capacitor and avoids its drawbacks. The converter achieves high voltage gain by cascaded boost method, which is composed of 3-winding coupled-inductor based boost cells. It reduces voltage stresses on the components in each cell, achieves high voltage gain by utilizing devices with low on-state resistance and low voltage rating that improves the efciency. An inherent passive clamp circuit alleviates voltage spike of switch as well as recycles the leakage energy. The converter provides high voltage gain, high efciency and high power density. The operation modes, steady-state analysis, stresses of the components, comparison with other candidates, and design guideline are analyzed and presented. The validation of the proposed converter is verifed by a 200 W prototype constructed in the laboratory
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Single-switch boost converter with extremely high step-up voltage gain
Hao, Yangyang,Li, Haibin,Li, Kai,Fang, Chengqun,Ding, Xinping The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.6
This paper presents a single-switch high-voltage gain DC-DC converter with a coupled-inductor. The proposed converter overcomes the drawbacks of traditional DC-DC converters such as insufficient boost capability and high stress on the devices. Its advantages include having a small number of switch devices, low voltage stress on the switch, and a high voltage gain. This paper analyzes the operating modes of the proposed converter in detail and derives the voltage/current stresses on the components. The efficiency of the converter and the power dissipation distribution are quantitatively studied. To verify the efficiency and feasibility of the proposed converter, a 200 W prototype was built in the laboratory. Experimental results obtained from the prototype match well with the theoretical analysis. The highest efficiency is equal to 95.82%, which can be obtained at half of the rated output power.
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A Hybrid Double Self-lift Switched-Coupled Inductor Quasi-Z-Source Inverter
Huang Dong,Xue Pengfei,Chen Guang,Zhang Chaozhong,Zhao Chang,Huang Yuchen,Ding Xinping,Zhang Min 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
A hybrid double self-lift switch-coupled-inductor quasi-Z-source inverter (HDSCL-qZSI) is proposed in this paper. The voltage boost capability is higher and the voltage and current stress on components are lower than the existing quasi-Z-source topologies. Owing to the strong current handling ability and step-down coupled-inductor, the magnetic elements are smaller than that of mSSCL-qZSI and SCL-qZSI whose structure are similar to that of HDCSL-qZSI. The operation principles, comparisons of voltage and current stress on components and the size of magnetic elements are analyzed theoretically. Finally, the eff ectiveness of the proposed HDSCL-qZSI was validated by a 1 kW prototype fabricated in the laboratory.
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