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- 저자 : Libo Zou (검색결과 4 건)
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Establishment of erosion model of gun steel material and study on its erosion performance
Libo Zou,Cungui Yu,Guangbin Feng,Jian-Lin Zhong,Yan lv 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.5
During the firing of the artillery, the high temperature and high pressure gas generated by the combustion of the gunpowder directly acts on the inner surface of the barrel. The oxidizing gas contained in the combustion products is thermochemically reacted with the gun steel material, causing the loss of surface material inside the bore. Thermochemical erosion of bore is one of the main factors affecting the life of the barrel. In order to be able to predict the amount of erosion produced by thermochemical erosion and to study the effects of thermophysical properties of gun steel materials on erosion. Based on Fourier heat conduction theory, a theoretical model of thermochemical erosion of gun steel materials was established. The semi-closed vessel test was designed to verify the theoretical model. The calculation results are in good agreement with the test results. At the same time, this paper also researched the influence of density, thermal conductivity and specific heat capacity of a gun steel material on material erosion based on the theoretical model. The research shows that with the increase of the density and specific heat capacity of the gun steel material, the erosion amount of the material increases correspondingly; as the thermal conductivity of the gun steel material increases, the erosion amount decreases accordingly. The research of this paper provides a certain theoretical basis for predicting the life of the barrel, and provides a certain guiding significance for the research of gun steel materials.
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Qing Jiao,Libo Zou,Peng Liu,Qian Xu,Yifei Zhang,Ying Yu,Lu Zou,Tianyan Chi,Xuefei Ji 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.10
Xanthoceraside, a saponin extracted from the husks of Xanthoceras sorbifolia Bunge, suppresses inflammation and oxidative stress. However, the antitumor properties of xanthoceraside as well as its mechanism of action remain unclear. Therefore, we proposed to investigate its potential anticancer property. In this study, the viability of cells was measured by the MTT assay. Cell cycle and mitochondrial membrane potential were measured by flow cytometry, and the expressions of procaspase-9, procaspase-3, Cyto.c, Apaf-1, Bcl-2, Bcl-xL, Bad, p53, and IGF-1R/Raf/MEK/ERK were tested by Western blotting. Xanthoceraside significantly inhibited the proliferation of human melanoma A375.S2 cells in a concentration- and time-dependent manner but did not impair the viability of normal cells (peripheral blood mononuclear cells). Further analysis revealed that xanthoceraside induced apoptosis by activating caspase-3 and caspase-9 in a time-dependent manner through the mitochondrial pathway but did not activate caspase-8 in the cells. In addition, xanthoceraside inhibited the expression of the insulin-like growth factor-1 receptor (IGF-1R), which is an important prosurvival, antiapoptotic signaling growth factor receptor that is frequently overexpressed in cancer cells and used as a therapeutic target for multiple cancers. Interestingly, xanthoceraside also decreased the expression of Raf, p-MEK, and p-ERK, the downstream effectors of IGF-1R. Taken together, these findings indicate that xanthoceraside induces apoptosis through a mitochondria-mediated apoptotic pathway, which is induced by the downregulation of IGF-1R/Raf/MEK/ERK cascades in A375.S2 cells.
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Miaomiao Li,Dening Zou,Yunong Li,Libo Tong 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.3
904L super austenitic stainless steel is prone to harmful secondary phase precipitation, which reduces corrosion resistance. The cooling rate during the solidification of steel is one of the critical factors affecting the precipitation of brittle phases instainless steel metals. In this paper, the effect of the cooling rates (6, 50, 100, 500, and 1000 °C min−1) on the initial corrosionbehavior of 904L steel in a simulated flue gas desulfurization (FGD) solution was studied by electrochemical measurementsand microscopic morphology observation. The results show that as the cooling rates increases, the primary solidification temperatureand the secondary dendrite arm spacing decrease. The precipitated phase in the steel is a σ-phase mainly distributedinterdendrites and forms zones of chromium and molybdenum depletion, reducing pitting resistance. With the increase in thecooling rate, the corrosion resistance increases first and then decreases, and reaches the maximum at 100 °C min−1. At thesame time, different cooling rates result in different contents of Cr and Mo in σ phase. At 100 °C min−1, the concentrationgradient of Cr and Mo near the interdendrites is the lowest compared with other cooling rates, which inhibits the growthrate of the σ phase nuclei and produces a more uniform microstructure. Corrosion test results show that pitting corrosion issensitive to the increase in the contents of Cr and Mo in the σ phase. The higher the content of Cr and Mo in the σ phase, themore serious the depletion of Cr and Mo near the interdendrites, and the worse the corrosion resistance.
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Miaomiao Li,Miaomiao Li,Dening Zou,Yunong Li,Libo Tong1 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
904L super austenitic stainless steel is prone to harmful secondary phase precipitation, which reduces corrosion resistance. The cooling rate during the solidification of steel is one of the critical factors affecting the precipitation of brittle phases instainless steel metals. In this paper, the effect of the cooling rates (6, 50, 100, 500, and 1000 °C min−1) on the initial corrosionbehavior of 904L steel in a simulated flue gas desulfurization (FGD) solution was studied by electrochemical measurementsand microscopic morphology observation. The results show that as the cooling rates increases, the primary solidification temperatureand the secondary dendrite arm spacing decrease. The precipitated phase in the steel is a σ-phase mainly distributedinterdendrites and forms zones of chromium and molybdenum depletion, reducing pitting resistance. With the increase in thecooling rate, the corrosion resistance increases first and then decreases, and reaches the maximum at 100 °C min−1. At thesame time, different cooling rates result in different contents of Cr and Mo in σ phase. At 100 °C min−1, the concentrationgradient of Cr and Mo near the interdendrites is the lowest compared with other cooling rates, which inhibits the growthrate of the σ phase nuclei and produces a more uniform microstructure. Corrosion test results show that pitting corrosion issensitive to the increase in the contents of Cr and Mo in the σ phase. The higher the content of Cr and Mo in the σ phase, themore serious the depletion of Cr and Mo near the interdendrites, and the worse the corrosion resistance.
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