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RISS 인기검색어
- 검색키워드
- 저자 : Haiming Hu (검색결과 4 건)
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An Anti-Overvoltage Strategy for Electrolytic Capacitorless IPMSM Drives Using Power Controller
Dawei Ding,Haiming Hu,Gaolin Wang,Guoqiang Zhang,Dianguo Xu,Frede Blaabjerg 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Three-phase input diode rectifier interior permanent magnet synchronous motor (IPMSM) drives with small-volume film capacitors have many merits, such as high reliability, low cost and high power density. However, in regenerative braking, the DC-link voltage becomes harder to be controlled than the traditional topology due to the application of slim film capacitors. In this paper, an anti-overvoltage strategy is proposed by controlling the electrical power of the motor directly. The q-axis current boundary is determined by the proposed power controller. Compared with the conventional method of voltage controller, the proposed method is more suitable for electrolytic capacitorless drives.
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Rapid fabrication of NiFe(OH)x/Fe0.2Co-Se complexes for oxygen evolution reaction electrocatalysis
Kang Gao,Miao Xu,Chuankun Zhang,Haiming Huang,Dongming Cai,Minglei Cao,Jun Wu,Chengrui Wu,Yongjin Hu,Rui Tong 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.124 No.-
Exploiting the inexpensive and efficient oxygen evolution reaction (OER) electrocatalysts is crucial forimproving the efficiency of electrocatalytic water splitting (EWS), since the slow 4-electron OER processis a rate-limiting step in EWS. Herein, we prepared the NiFe(OH)x/Fe0.2Co-Se complexes on carbon paper(CP) via an easy two-step electrochemical deposition strategy. By varying the doping amount of Fe andthe deposition time of Fe0.2Co-Se, the OER property of NiFe(OH)x/Fe0.2Co-Se/CP was optimized to the best:only requiring low overpotentials of 243 and 277 mV at the current density of 20 and 100 mA/cm2 (j20and j100) and a small Tafel slope of 36.8 mV/dec, along with a terrific long-term durability in 1 M KOH. According to the experimental results, the rich exposed active sites, improved intrinsic site activityand enhanced electrical conductivity lead to the superior OER performance. Our work will provide someinspiration for designing other metal selenide/hydroxide heterostructures for other energy conversion orstorage applications.
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HOW DID A MAJOR CONFINED FLARE OCCUR IN SUPER SOLAR ACTIVE REGION 12192?
Jiang, Chaowei,Wu, S. T.,Yurchyshyn, Vasyl,Wang, Haiming,Feng, Xueshang,Hu, Qiang American Astronomical Society 2016 The Astrophysical journal Vol.828 No.1
<P>We study the physical mechanism of a major X-class solar flare that occurred in the super NOAA active region (AR) 12192 using data-driven numerical magnetohydrodynamic (MHD) modeling complemented with observations. With the evolving magnetic fields observed at the solar surface as bottom boundary input, we drive an MHD system to evolve self-consistently in correspondence with the realistic coronal evolution. During a two-day time interval, the modeled coronal field has been slowly stressed by the photospheric field evolution, which gradually created a large-scale coronal current sheet, i.e., a narrow layer with intense current, in the core of the AR. The current layer was successively enhanced until it became so thin that a tether-cutting reconnection between the sheared magnetic arcades was set in, which led to a flare. The modeled reconnecting field lines and their footpoints match well the observed hot flaring loops and the flare ribbons, respectively, suggesting that the model has successfully 'reproduced' the macroscopic magnetic process of the flare. In particular, with simulation, we explained why this event is a confined eruption-the consequence of the reconnection is a shared arcade instead of a newly formed flux rope. We also found a much weaker magnetic implosion effect compared to many other X-class flares.</P>
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Jianle Wang,Majid Nisar,Chongan Huang,Xiangxiang Pan,Dongdong Lin,Gang Zheng,Haiming Jin,Deheng Chen,Naifeng Tian,Qianyu Huang,Yue Duan,Yingzhao Yan,Ke Wang,Congcong Wu,Jianing Hu,Xiaolei Zhang,Xiangy 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-
Oxidative stress-induced mitochondrial dysfunction is implicated in the pathogenesis of intervertebral disc degeneration (IVDD). Sirtuin 3 (SIRT3), a sirtuin family protein located in mitochondria, is essential for mitochondrial homeostasis; however, the role of SIRT3 in the process of IVDD has remained elusive. Here, we explored the expression of SIRT3 in IVDD in vivo and in vitro; we also explored the role of SIRT3 in senescence, apoptosis, and mitochondrial homeostasis under oxidative stress. We subsequently activated SIRT3 using honokiol to evaluate its therapeutic potential for IVDD. We assessed SIRT3 expression in degenerative nucleus pulposus (NP) tissues and oxidative stressinduced nucleus pulposus cells (NPCs). SIRT3 was knocked down by lentivirus and activated by honokiol to determine its role in oxidative stress-induced NPCs. The mechanism by which honokiol affected SIRT3 regulation was investigated in vitro, and the therapeutic potential of honokiol was assessed in vitro and in vivo. We found that the expression of SIRT3 decreased with IVDD, and SIRT3 knockdown reduced the tolerance of NPCs to oxidative stress. Honokiol (10 μM) improved the viability of NPCs under oxidative stress and promoted their properties of anti-oxidation, mitochondrial dynamics and mitophagy in a SIRT3-dependent manner. Furthermore, honokiol activated SIRT3 through the AMPKPGC- 1α signaling pathway. Moreover, honokiol treatment ameliorated IVDD in rats. Our study indicated that SIRT3 is involved in IVDD and showed the potential of the SIRT3 agonist honokiol for the treatment of IVDD.
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