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| 1 | Synthesis of Al_(4)SiC_(4) powders via carbothermic reduction: Reaction and grain growth mechanisms显示文摘Highly pure Al_(4)SiC_(4) powders were prepared by carbothermic reduction at 2173 K using Al_(2)O_(3),SiO_(2),and graphite as raw materials.The obtained Al_(4)SiC_(4) powders owned hexagonal plate-like grains with a diameter of about 200-300μm and a thickness of about 2-6μm.Based on the experimental results,the reaction of Al_(4)SiC_(4) formation and grain evolution mechanisms were determined from thermodynamic and first-principles calculations.The results indicated that the synthesis of Al_(4)SiC_(4) by the carbothermic reduction consisted of two parts,i.e.,solid-solid reactions initially followed by complex gas-solid and gas-gas reactions.The grain growth mechanism of Al_(4)SiC_(4) featured a two-dimensional nucleation and growth mechanism.The gas phases formed during the sintering process favored the preferential grain growth of(0010)and(110)planes resulting in formation of hexagonal plate-like Al_(4)SiC_(4) grains. | Xinming XING Junhong CHEN Guoping BEI Bin LI Kuo-Chih CHOU Xinmei HOU | 2017 | Journal of Advanced Ceramics2017，6，4： | 3 |
| 2 | Synthesis of Ti2 SnC at low-tempera-ture using mechanically activated sintering process显示文摘 | Li Shibo Bei Guoping Zhai Hongxiang | 2007 | Materials Science and Engineering2007，457，： | 1 |
| 3 | Exercise training maintains cardiovascular health:signaling pathways involved and potential therapeutics显示文摘Exercise training has been widely recognized as a healthy lifestyle as well as an effective non-drug therapeutic strategy for cardiovascular diseases(CVD).Functional and mechanistic studies that employ animal exercise models as well as observational and interventional cohort studies with human participants,have contributed considerably in delineating the essential signaling pathways by which exercise promotes cardiovascular fitness and health.First,this review summarizes the beneficial impact of exercise on multiple aspects of cardiovascular health.We then discuss in detail the signaling pathways mediating exercise’s benefits for cardiovascular health.The exercise-regulated signaling cascades have been shown to confer myocardial protection and drive systemic adaptations.The signaling molecules that are necessary for exercise-induced physiological cardiac hypertrophy have the potential to attenuate myocardial injury and reverse cardiac remodeling.Exercise-regulated noncoding RNAs and their associated signaling pathways are also discussed in detail for their roles and mechanisms in exercise-induced cardioprotective effects.Moreover,we address the exercise-mediated signaling pathways and molecules that can serve as potential therapeutic targets ranging from pharmacological approaches to gene therapies in CVD.We also discuss multiple factors that influence exercise’s effect and highlight the importance and need for further investigations regarding the exercise-regulated molecules as therapeutic targets and biomarkers for CVD as well as the cross talk between the heart and other tissues or organs during exercise.We conclude that a deep understanding of the signaling pathways involved in exercise’s benefits for cardiovascular health will undoubtedly contribute to the identification and development of novel therapeutic targets and strategies for CVD. | Huihua Chen Chen Chen Michail Spanos Guoping Li Rong Lu Yihua Bei Junjie Xiao | 2022 | Signal Transduction and Targeted Therapy2022，7，10： | 1 |
| 4 | Synthesis of Ti2SnC at low-temperature using mechanically activated sintering process 显示文摘 | Li Shibo Bei Guoping Zhai Hongxiang | 2007 | Mater Sei Eng2007，457，： | 1 |
| 5 | Synthesis ofTi2SnC at low-temperature using mechanically activated sinter-ing process显示文摘 | Li Shibo Bei Guoping Zhai Hongxiang | 2007 | Materials Science and Engineering A2007，457，： | 1 |
| 6 | Synthesis of Ti2SnC from Ti/Sn/TiC powder mixtures by pressureless sintering technique显示文摘 | Li shibo Bei Guoping Zhai Hongxia | 2006 | Materials Letters2006，，35： | 1 |
| 7 | Synthesis and microstructure of Ti3AlC2 by mechanically activated sintering of elemental powders显示文摘 | LI Shibo ZHAI Hongxiang BEI Guoping ZHOU Yang ZHANG Zhili | 2007 | Ceramics International2007，33，： | 1 |
| 8 | Deintercalation of Al from MoAlB by molten salt etching to achieve a Mo_(2)AlB_(2) compound and 2D MoB nanosheets显示文摘Two-dimensional(2D)MoB metal borides(MoB MBene)have attracted much attention due to their fascinating properties and functional applications.So far,work on the synthesis of 2D MoB nanosheets by acid or alkaline etching of MoAlB has not been very successful.It has been proposed that the 2D MoB MBene may be fabricated by chemical etching of a Mo_(2)AlB_(2) precursor,but further investigations were not performed possibly due to the difficult preparation of the metastable Mo_(2)AlB_(2) compound at high temperatures by solid-state reactions.Here,we report on the successful synthesis of the Mo_(2)AlB_(2) compound and 2D MoB nanosheets by the deintercalation of Al from MoAlB through a ZnCl_(2) molten salt etching approach at relatively low temperatures.The influence of etching temperature,etching time,and starting mixtures on the formation of desirable phases have been investigated.A pure Mo_(2)AlB_(2) compound was synthesized at temperatures below 600℃,while the 2D MoB MBene nanosheets were obtained at 700℃through the molten salt etching of MoAlB.In addition,the present work further confirms that the MoB MBene can be prepared by etching the as-synthesized Mo_(2)AlB_(2) precursor in LiF–HCl solution.Our work demonstrates that the molten salt etching is an effective method to prepare 2D MoB MBene. | Junji Mou Shibo Li Weiwei Zhang Weimin Xu Shukai Fan Guoping Bei | 2023 | Journal of Advanced Ceramics2023，12，5： | 0 |
| 9 | Synthesis and properties of MoAlB composites reinforced with SiC particles显示文摘Novel MoAlB composites reinforced with 5–15 vol% SiC have been firstly prepared and characterized in the present study. The SiC reinforcement is stable with MoAlB at a sintering temperature of 1200 ℃ in Ar. The 5 vol% SiC/MoAlB composite exhibited improved mechanical properties and enhanced oxidation resistance. A flexural strength of 380 MPa and a Vickers hardness of 12.7 GPa were achieved and increased by 24% and 51%, respectively, as compared with those for MoAlB, indicating the enhanced strengthening effect of SiC. Cyclic oxidation tests at 1200 and 1300 ℃ for 10 h in air showed that the 5 vol% SiC/MoAlB composite has better oxidation resistance than MoAlB due to the formation of a dense and continuous scale composed of Al_(2)O_(3) and SiO_(2), which prevents the oxygen inward diffusion and the evaporation of oxides. We expect that the general strategy of second phase reinforcing for materials will help to widen the applications of MoAlB composites. | Weiwei ZHANG Shibo LI Shuang WU Boxiang YAO Shukai FAN Guoping BEI Wenbo YU Yang ZHOU Ying WU Sun-An DING | 2022 | Journal of Advanced Ceramics2022，11，3： | 0 |
| 10 | Self-healing behavior of Ti_(2)AlC at a low oxygen partial pressure显示文摘Ti_(2)AlC,a MAX phase ceramic,has an attractive self-healing ability to restore performance via the oxidation-induced crack healing mechanism upon healing at high temperatures in air(high oxygen partial pressures).However,such healing ability to repair damages in vacuum or low oxygen partial pressure conditions remains unknown.Here,we report on the self-healing behavior of Ti_(2)AlC at a low oxygen partial pressure of about 1 Pa.The experimental results showed that the strength recovery depends on both healing temperature and time.After healing at 1400℃for 1–4 h,the healed samples exhibited the recovered strengths even exceeding the original strength of 375 MPa.The maximum recovered strength of~422 MPa was achieved in the healed Ti_(2)AlC sample after healing at 1400 for 4 h,about 13%higher than the original strength.Damages were healed by the formed℃TiCx from the decomposition of Ti_(2)AlC.The decomposition-induced crack healing as a new mechanism in the low oxygen partial pressure condition was disclosed for the MAX ceramics.The present study illustrates that key components made of Ti_(2)AlC can prolong their service life and keep their reliability during use at high temperatures in low oxygen partial pressures. | Boxiang YAO Shibo LI Weiwei ZHANG Wenbo YU Yang ZHOU Shukai FAN Guoping BEI | 2022 | Journal of Advanced Ceramics2022，11，11： | 0 |
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