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| 1 | Design and Preparation of High Elastic Modulus Self-compacting Concrete for Pre-stressed Mass Concrete Structures显示文摘Requirements of self-compacting concrete(SCC) applied in pre-stressed mass concrete structures include high fluidity, high elastic modulus, low adiabatic temperature rise and low drying shrinkage, which cannot be satisfied by ordinary SCC. In this study, in order to solve the problem, a few principles of SCC design were proposed and the effects of binder amount, fly ash(FA) substitution, aggregate content and gradation on the workability, temperature rise, drying shrinkage and elastic modulus of SCC were investigated.The results and analysis indicate that the primary factor influencing the fluidity was paste content, and the main methods improving the elastic modulusof SCC were a lower sand ratio and an optimized coarse aggregate gradation. Lower adiabatic temperature rise and drying shrinkage were beneficial for decreasing the cement content. Further, based on the optimization of mixture, a C50 grade SCC(with binder amount of only 480 kg/m3, fly ash substitution of 40%, sand ratio of 51% and proper coarse aggregate gradation(V5-10 mm: V10-16 mm: V16-20 mm= 30%: 30%:40%)) with superior workability was successfully prepared. The temperature rise and drying shrinkage of the prepared SCC were significantly reduced, and the elastic modulus reached 37.6 GPa at 28 d. | 祝雯 CHEN Yang LI Fangxian ZHANG Tongsheng HU Jie 韦江雄 YU Qijun | 2016 | Journal of Wuhan University of Technology(Materials Science)2016，31，3： | 1 |
| 2 | Direct synthesis of carbon nanotubes on fly ash particles to produce carbon nanotubes/fly ash composites显示文摘Fly ash was used as catalytic support for carbon nanotubes(CNTs)growth by chemical vapor deposition(CVD)due to having ideal compositions(SiO2,Al2O3,and Fe2O3).In this paper,CNTs were synthesized on Ni catalyst/fly ash substrate using CVD method.The influence of parameters(e.g.,reaction temperature and gas flow rate)on the carbon yield and structure of the resulting CNTs was on the carbon yield and structure of the resulting CNTs was investigated by thermo-gravimetric analyses,Scanning electron microscopy,and Raman spectroscopy analysis.The results indicated that the growth temperature controlling had a significant effect on the diameter of CNTs.And the proper acetylene and hydrogen flow rate would decrease in defect density and increase in yield of as-grown CNTs on fly ash.Finally,the amorphous carbon on the surface of as-grown CNTs were removed by heating in air.Experimental results showed that the hydrophobic of the annealed CNTs was weak due to introducing functional groups to the surface of CNTs. | Fangxian LI Cheng ZHOU Pengfei YANG Beihan WANG Jie HU Jiangxiong WEI Qijun YU | 2019 | Frontiers of Structural and Civil Engineering2019，13，6： | 1 |
| 3 | New Method of Mix Design for Self-Compacting Concrete Based on Material Characteristics显示文摘 | Li Fangxian Wei Jiangxiong Wang Jingping | 2012 | Procedia Engineering2012，，27： | 1 |
| 4 | Single crystalline CeO_(2) nanotubes显示文摘Here,we report a facile synthetic methodology to prepare uniform single crystalline CeO_(2) nanotubes through a hydrothermal transformation of CeO_(2) nanorods in aqueous Ce(NO3)3 solution.A chemically driven etching-dissolution-deposition mechanism is proposed,involving the surface Ce^(3+)hydrolysis and dissolution at tips of nanorods and subsequent redeposition and crystallization on the outer sides of nanorods.Compared to CeO_(2) nanorods,CeO_(2) nanotubes exhibited the richer structural defects,higher reducibility and larger surface area,leading to a higher haloperoxidase-like activity. | Fangxian Cao Mingkai Zhang Kaili Yang Zhimin Tian Jing Li Yongquan Qu | 2021 | Nano Research2021，14，3： | 0 |
| 5 | Current Status and Main Scientific Outcomes of the CSES Mission显示文摘This report briefly introduces the current status of the CSES(China Seismo-Electromagnetic Satellite)mission which includes the first satellite CSES 01 in-orbit(launched in February 2018),and the second satellite CSES 02(will be launched in 2023)under development.The CSES 01 has been steadily operating in orbit for over four years,providing abundant global geophysical field data,including the background geomagnetic field,the electromagnetic field and wave,the plasma(in-situ and profile data),and the energetic particles in the ionosphere.The CSES 01 platform and the scientific instruments generally perform well.The data validation and calibration are vital for CSES 01,for it aims to monitor earthquakes by extracting the very weak seismic precursors from a relatively disturbing space electromagnetic environment.For this purpose,we are paying specific efforts to validate data quality comprehensively.From the CSES 01 observations,we have obtained many scientific results on the ionosphere electromagnetic environment,the seismo-ionospheric disturbance phenomena,the space weather process,and the Lithosphere-Atmosphere-Ionosphere coupling mechanism. | ZEREN Zhima HUANG Jianping LIU Dapeng YANG Yanyan YAN Rui ZHAO Shufan ZHANG Zhenxia LIN Jian CUI Jing CHU Wei WANG Qiao LU Hengxin XU Song GUO Feng YANG Dehe ZHOU Na LIU Qinqin HUANG He WANG Jie TAN Qiao LI Wenjing LÜFangxian ZHU Keying SHEN Xuhui | 2022 | 空间科学学报2022，42，4： | 0 |
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