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Properties of Fe-based Cr3C2 Coatings Produced with a High-Velocity Arc-Spraying Process
Can-Ming Wang,Hong-Fei Sun,Zhiyan Qu,Qiang Song 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.3
Fe-based Cr3C2 coatings were sprayed with a high-velocity spraying process. The main phases of the coatings were α-Fe, (Fe, Cr)23C6, (Fe, Cr)7C3, FeCr2O4, Cr3C2 and a small amount of Fe3Si. The abrasive wear performances of the coatings were tested by using a rubber wheel abrasive tester. The wear mechanisms of the coatings were mainly plastic cutting and brittle fracture of some ceramic phases. At 650℃ the erosion rate of the coatings had a peak value at 40℃ impingement angles. The coatings exhibited excellent erosion resistance at high temperatures and were suitable for use in circulating fluid-bed boilers. Fe-based Cr3C2 coatings were sprayed with a high-velocity spraying process. The main phases of the coatings were α-Fe, (Fe, Cr)23C6, (Fe, Cr)7C3, FeCr2O4, Cr3C2 and a small amount of Fe3Si. The abrasive wear performances of the coatings were tested by using a rubber wheel abrasive tester. The wear mechanisms of the coatings were mainly plastic cutting and brittle fracture of some ceramic phases. At 650℃ the erosion rate of the coatings had a peak value at 40℃ impingement angles. The coatings exhibited excellent erosion resistance at high temperatures and were suitable for use in circulating fluid-bed boilers.
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Xuan Lihui,Xu Zheng,Luo Jinhua,Yin Wang,Yan Yuhui,Qu Can,Xie Zuozhong,Skonieczna Magdalena,Zhou Ping-Kun,Huang Ruixue 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
Exposure to nanomicroplastics (nano-MPs) can induce lung damage. The gut microbiota is a critical modulator of the gut–lung axis. However, the mechanisms underlying these interactions have not been elucidated. This study explored the role of lactate, a key metabolite of the microbiota, in the development of lung damage induced by nano-MPs (LDMP). After 28 days of exposure to nano-MPs (50–100 nm), mice mainly exhibited damage to the lungs and intestinal mucosa and dysbiosis of the gut microbiota. Lactate accumulation was observed in the lungs, intestines and serum and was strongly associated with the imbalance in lactic acid bacteria in the gut. Furthermore, no lactate accumulation was observed in germ-free mice, while the depletion of the gut microbiota using a cocktail of antibiotics produced similar results, suggesting that lactate accumulation in the lungs may have been due to changes in the gut microbiota components. Mechanistically, elevated lactate triggers activation of the HIF1a/PTBP1 pathway, exacerbating nano-MP-induced lung damage through modulation of the epithelial–mesenchymal transition (EMT). Conversely, mice with conditional knockout of Ptbp1 in the lungs (Ptbp1flfl) and PTBP1-knockout (PTBP1-KO) human bronchial epithelial (HBE) cells showed reversal of the effects of lactate through modulation of the HIF1a/PTBP1 signaling pathway. These findings indicate that lactate is a potential target for preventing and treating LDMP.
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공유경제 환경에서 차량 공유서비스 활용에 영향을 미치는 요인에 관한 연구 : 중국의 디디추싱(滴滴出行) 사례 분석을 중심으로
윤민석(Min-Suk Yoon),판찬(Can Pan),곡민(Min Qu) 한국IT서비스학회 2021 한국IT서비스학회지 Vol.20 No.2
As vehicle sharing service is being widely used in China. The sharing economy appeared to be a way to make people s lives more convenient and to utilize limited resources efficiently. Sharing economy companies have created an app to satisfy users’ needs with providing more benefits. Although research on vehicle sharing services has been continuously conducted at the level of the sharing economy, there are not many empirical studies related to the perception of the sharing economy from the consumer s point of view. In this sense, this study considered the perceived relationship benefits (social benefits, economic benefits, psychological benefits, and functional benefits) of Didi chuxing service as the key independent variables influencing users’ confirmation and satisfaction, And suggests that users’ confirmation and satisfaction are the key determinants of Didi continuance intention. To test the proposed research model, this study conducted structural equation model using 268 data collected on the users who have experience of Didi service. According to the empirical analysis results, This study verifies that: First, social benefits, economic benefits, psychological benefits, and functional benefits are determinants of user’s satisfaction. Second, expectation confirmation depends on economic benefits, psychological benefits, functional benefits and social influence, meanwhile, social benefit has no effect on expectation confirmation. Third, expectation confirmation is proved to be a positive predictor of users’ satisfaction. Finally, this results indicate that continuous use intention is determined by users’ satisfaction.
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