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| 1 | Controlled growth and photoluminescence of highly oriented arrays of ZnO nanocones with different diameters显示文摘Large-scale oriented ZnO nanocone arrays were directly grown on zinc substrate through a hydro-thermal reaction of Zn foil with aqueous butylamine solution(3 mol/L) at 100-180 ℃ for 12 h.The syn-thesized products were characterized with X-ray diffraction,Raman spectrum,scanning electron mi-croscopy and transmission electron microscopy.The results showed that the ZnO nanocones were single crystalline with the wurtzite structure and grown along the [0001] direction.The diameter of nanocones is decreased with increasing the reaction temperature.A possible growth mechanism was also proposed to account for the formation of the ZnO nanocone arrays.The photoluminescence spectra of the ZnO nanocone arrays were studied at room temperature,two UV emission bands at 377 and 396 nm assigned to free exciton emission and exciton-exciton collision,respectively,and phonon replicas associated with 2-E2 phonon were observed in the PL spectra. | MA JunHu YANG HeQing SONG YuZhe LI Li XIE XiaoLi LIU RuiNi WANG LinFang | 2009 | Science China(Technological Sciences)2009，52，5： | 4 |
| 2 | Electromagnetic wave absorption properties of flaky Fe-Ti-Si-A1 nanocrystalline com- posites 显示文摘 | Liu Junhu Ma Tianyu Tong Hui | 2010 | Journal of Magnetism and Magnetic Materials2010，322，8： | 1 |
| 3 | Electromagnetic wave absorption properties of flaky Fe-Ti-Si-Al nanocrystalline composites显示文摘 | Liu Junhu Ma Tianyu Tong hui | 2010 | Journal of Magnetism and Magnetic Materials2010，，： | 1 |
| 4 | Synthesis of Iron-Carbide Nanoparticles:Identification of the Active Phase and Mechanism of Fe-Based Fischer-Tropsch Synthesis显示文摘Despite the extensive study of the Fe-based Fischer-Tropsch synthesis(FTS)over the past 90 years,its active phases and reaction mechanisms are still unclear due to the coexistence of metals,oxides,and carbide phases presented under realistic FTS reaction conditions and the complex reaction network involving CO activation,C-C coupling,and methane formation.To address these issues,we successfully synthesized a range of pure-phase iron and iron-carbide nanoparticles(Fe,Fe_(5)C_(2),Fe_(3)C,and Fe_(7)C_(3))for the first time.By using them as the ideal model catalysts on high-pressure transient experiments,we identified unambiguously that all the iron carbides are catalytically active in the FTS reaction while Fe_(5)C_(2) is the most active yet stable carbide phase,consistent with density functional theory(DFT)calculation results.The reaction mechanism and kinetics of Fe-based FTS were further explored on the basis of those model catalysts by means of transient high-pressure stepwise temperature-programmed surface reaction(STPSR)experiments and DFT calculations.Our work provides new insights into the active phase of iron carbides and corresponding FTS reaction mechanism,which is essential for better iron-based catalyst design for FTS reactions. | Huabo Zhao Jin-Xun Liu Ce Yang Siyu Yao Hai-Yan Su Zirui Gao Mei Dong Junhu Wang Alexandre I.Rykov Jianguo Wang Yanglong Hou Wei-Xue Li Ding Ma | 2021 | CCS Chemistry2021，3，11： | 1 |
| 5 | Simultaneous occurrence of four magnetospheric wave modes and the resultant combined scattering effect on radiation belt electrons显示文摘We report a representative concurrent event of four wave modes at L≈5.0,including electrostatic electron cyclotron harmonic(ECH)waves,exohiss,magnetosonic(MS)waves,and electromagnetic ion cyclotron(EMIC)waves,based on the observations from Van Allen Probe A on October 15,2015.The diffusion coefficients induced by these waves are calculated by using both the Full Diffusion Code and test particle simulations.Moreover,the scattering effects of these waves on energetic electrons are simulated by using a two-dimensional Fokker-Planck diffusion model.The results show that ECH waves mainly scatter low-pitch-angle(<20°)electrons at 0.1-10 keV;exohiss can significantly scatter hundreds of kiloelectron volt electrons to form a reversed energy spectrum;MS waves mainly affect high-pitch-angle electrons(>60°);and EMIC waves scatter only>5 MeV electrons.The combined scattering effects of exohiss and MS waves are stronger than those of exohiss alone.The top-hat pitch angle distributions produced by exohiss are relaxed after adding the effect of MS waves.Because the energies of electrons scattered by ECH waves and EMIC waves are much lower and higher than those scattered by exohiss and MS waves,respectively,the combined scattering effects with the addition of ECH and EMIC waves show little difference from the results for the combination of MS waves and exohiss.These results suggest that distinct wave modes can occur simultaneously and scatter electrons in combination or individually,which requires careful consideration in future global simulations of the complex dynamics of radiation belt energetic electrons. | YiWen Zhao Zheng Xiang XuDong Gu BinBin Ni Xin Ma YueQun Lou LuHuai Jiao RuoXian Zhou DeYu Guo YangXiZi Liu JunHu Dong | 2022 | Earth and Planetary Physics2022，6，6： | 0 |
| 6 | Cross-satellite calibration of high-energy electron fluxes measured by FengYun-4A based on Arase observations显示文摘We use the High-energy Electron Experiments(HEP)instrument onboard Arase(ERG)to conduct an energy-dependent cross-satellite calibration of electron fluxes measured by the High Energy Particle Detector(HEPD)onboard FengYun-4A(FY-4A)spanning from April 1,2017,to September 30,2019.By tracing the two-dimensional magnetic positions(L,magnetic local time[MLT])of FY-4A at each time,we compare the datasets of the conjugate electron fluxes over the range of 245–894 keV in 6 energy channels for the satellite pair within different sets of L×MLT.The variations in the electron fluxes observed by FY-4A generally agree with the Arase measurements,and the percentages of the ratios of electron flux conjunctions within a factor of 2 are larger than 50%.Compared with Arase,FY-4A systematically overestimates electron fluxes at all 6 energy channels,with the corresponding calibration factors ranging from 0.67 to 0.81.After the cross-satellite calibration,the electron flux conjunctions between FY-4A and Arase show better agreement,with much smaller normalized root mean square errors.Our results provide a valuable reference for the application of FY-4A high-energy electron datasets to in-depth investigations of the Earth’s radiation belt electron dynamics. | XiaoYu Wang Xing Cao Xin Ma XiaoXin Zhang AnQin Chen JunHu Dong BinBin Ni XianKang Dou | 2023 | Earth and Planetary Physics2023，7，5： | 0 |
| 7 | Modeling the energetic electron fluxes in the inner radiation belt based on a drift-source model显示文摘The Macao Science Satellite-1(MSS-1),designed by the Macao University of Science and Technology and the National Space Science Center(NSSC)of China,is equipped to detect the fine structure of the magnetic field over the South Atlantic Anomaly(SAA)region,monitoring geomagnetic field variations,and obtaining the energetic electron spectrum distributions in the Earth’s inner radiation belt.In this study,we simulate the distributions of trapped,quasi-trapped,and untrapped electrons along the orbit of MSS-1 based on a drift-source model.The simulation results show that the particle detector with 90°looking direction can observe trapped electrons in the SAA region,untrapped electrons in the regions conjugated with the SAA region at the north hemisphere,and quasitrapped electrons in all other regions.In contrast,the detectors with<60°looking directions can measure only untrapped electrons.Generally,quasi-trapped electron fluxes accumulate along the drift trajectory and are due primarily to CRAND,until reaching the SAA region where quasi-trapped electrons are all lost into the atmosphere. | Zheng Xiang BinBin Ni YangXiZi Liu XuDong Gu Song Fu Wei Xu Xing Cao Xin Ma DeYu Guo JunHu Dong JingLe Hu | 2023 | Earth and Planetary Physics2023，7，1： | 0 |
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