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RISS 인기검색어
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- 저자 : Ren Guofeng (검색결과 5 건)
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Guofeng Xu,Yuanwen Cai,Yuan Ren,Chaojun Xin,Yahong Fan,Dengliang Hu 한국자기학회 2017 Journal of Magnetics Vol.22 No.2
Magnetically suspended control & sensitive gyroscope (MSCSG) is a novel type of gyroscope with the integration of attitude control and attitude angular measurement. To improve the precision and reduce the power consumption of Lorentz Force-type Magnetic Bearing (LFMB), the air gap flux density distribution of LFMB has been studied. The uniformity of air gap flux density is defined to qualify the uniform degree of the air gap flux density distribution. Considering the consumption, the average value of flux density is defined as well. Some optimal designs and analyses of LFMB are carried out by finite element simulation. The strength of the permanent magnet is taken into consideration during the machining process. To verify the design and simulation, a high-precision instrument is employed to measure the 3-dimensional magnetic flux density of LFMB. After measurement and calculation, the uniform degree of magnetic flux density distribution reaches 0.978 and the average value of the flux density is 0.482T. Experimental results show that the optimal design is effective and some useful advice can be obtained for further research.
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Study on surface defects in milling Inconel 718 super alloy
Liu Chang,Ren Chengzu,Wang Guofeng,Yang Yinwei,Zhang Lu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
Nickel-based alloys have been extensively used as critical components in aerospace industry, especially in the key section of aeroengine. In general, these sections are manufactured by milling process because most of them have complex forms. However, surfacedefects appear frequently in milling due to periodic impact force, which leads to the deterioration of the fatigue life. We conducted millingexperiments under different cutting conditions and found that four kinds of defects, i.e., tear, cavity, build up edge (BUE) and groove,commonly appear on the machined surface. Based on the observed results, the morphology and generation regime of these defects areanalyzed and the carbide particle cracking is discussed to explain the appearance of the nickel alloy defects. To study the effect of thecutting parameters on the severity of these surface defects, two qualitative indicators, which are named as average number of the defectsper field and average area ratio of the defects per field, are presented and the influence laws are summarized based on the results correspondingly. This study is helpful for understanding the generation mechanism of the surface defects during milling process of nickelbased super alloy.
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Xin Chaojun,Cai Yuanwen,Ren Yuan,Fan Yahong,Xu Guofeng,Lei Xu 한국자기학회 2016 Journal of Magnetics Vol.21 No.4
Magnetically suspended sensitive gyroscopes (MSSGs) provide an interesting alternative for achieving precious attitude angular measurement. To effectively reduce the measurement error caused by dynamic imbalance, this paper proposes a novel compensation method based on analysis and modeling of the error for a MSSG. Firstly, the angular velocity measurement principle of the MSSG is described. Then the analytical model of dynamic imbalance error has been established by solving the complex coefficient differential dynamic equations of the rotor. The generation mechanism and changing regularity of the dynamic imbalance error have been revealed. Next, a compensation method is designed to compensate the dynamic imbalance error and improve the measurement accuracy of the MSSG. The common issues caused by dynamic imbalance can be effectively resolved by the proposed method in gyroscopes with a levitating rotor. Comparative simulation results before and after compensation have verified the effectiveness and superiority of the proposed compensation method.
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Jingfang Luo,Yi Long,Guofeng Ren,Yahui Zhang,Jihua Chen,Ruixue Huang,Lina Yang 한국식품영양과학회 2019 Journal of medicinal food Vol.22 No.12
Hepatic injury is significant in the pathogenesis and development of many types of liver diseases. Punicalagin (PU) is a bioactive antioxidant polyphenol found in pomegranates. To explore its protective effect against carbon tetrachloride (CCl4)-induced liver injury and the mechanism, Institute of Cancer Research (ICR) mice and L02 cells were used to observe the changes of serum biochemical indicators, histopathological liver structure, cell viability, antioxidative indices, and autophagy-related proteins were assessed. In ICR mice, PU ameliorated the CCl4-induced increase of the serum aspartate aminotransferase, alanine aminotransferase, the activity of liver lactate dehydrogenase, and the damage of histopathological structure, and exhibited a hepatoprotective effect against CCl4. PU attenuated oxidative stress by decreasing the liver malondialdehyde level and increasing the activities of liver superoxide dismutase, glutathione peroxidase, and the expression of the liver nuclear factor E2-related factor (Nrf2) protein. Furthermore, according to the vivo and vitro experiments, PU might activate autophagy through the mediation of the Akt/FOXO3a and P62/Nrf2 signaling pathway. Taken together, these results suggest that PU may protect against CCl4-induced liver injury through the upregulation of antioxidative activities and autophagy.
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Meng, Yanshuang,Cheng, Yulong,Ke, Xinyou,Ren, Guofeng,Zhu, Fuliang The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.2
The inverse spinel Cobalt ferrite (CoFe<sub>2</sub>O<sub>4</sub>, CFO) is considered to be a promising alternative to commercial graphite anodes for lithium ion batteries (LIBs). However, the further development of CFO is limited by its unstable structure during battery cycling and low electrical conductivity. In an effort to address the challenge, we construct three-dimensional hierarchical flower-like CFO nanoclusters (CFO NCs)-decorated carbonized cotton carbon fiber (CFO NCs/CCF) composite. This structure is consisted of microfibers and nanoflower cluster composited of CFO nanoparticle, in which CCF can be used as a long-range conductive matrix, while flower-like CFO NCs can provide abundant active sites, large electrode/electrolyte interface, short lithium ion diffusion path, and alleviated structural stress. As anode materials in LIBs, the flower-like CFO NCs/CCF exhibits excellent electrochemical performance. After 100 cycles at a current density of 0.3 A g<sup>-1</sup>, the CFO NCs/CCF delivers a discharge/charge capacity of 1008/990 mAh g<sup>-1</sup>. Even at a high current density of 15 A g<sup>-1</sup>, it still maintains a charge/discharge capacity of 362/361 mAh g<sup>-1</sup>.
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