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35篇 您的检索式:作者名="Xiongjun Liu"
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1Laser performance of the SG-Ⅲ laser facility显示文摘SG-Ⅲ laser facility is now the largest laser driver for inertial confinement fusion research in China. The whole laser facility can deliver 180 kJ energy and 60 TW power ultraviolet laser onto target, with power balance better than 10%.We review the laser system and introduce the SG-Ⅲ laser performance here.Wanguo Zheng Xiaofeng Wei Qihua Zhu Feng Jing Dongxia Hu Jingqin Su Kuixing Zheng Xiaodong Yuan Hai Zhou Wanjun Dai Wei Zhou Fang Wang Dangpeng Xu Xudong Xie Bin Feng Zhitao Peng Liangfu Guo Yuanbin Chen Xiongjun Zhang Lanqin Liu Donghui Lin Zhao Dang Yong Xiang Xuewei Deng 2016High Power Laser Science and Engineering2016,4,3:13
2Laser performance upgrade for precise ICF experiment in SG-Ⅲ laser facility显示文摘The SG-Ⅲlaser facility(SG-Ⅲ)is the largest laser driver for inertial confinement fusion(ICF)researches in China,which has 48 beamlines and can deliver 180 kJ ultraviolet laser energy in 3 ns.In order to meet the requirements of precise physics experiments,some new functionalities need to be added to SG-Ⅲand some intrinsic laser performances need upgrade.So at the end of SG-Ⅲ's engineering construction,the 2-year laser performance upgrade project started.This paper will introduce the newly added functionalities and the latest laser performance of SG-Ⅲ.With these function extensions and performance upgrade,SG-Ⅲis now fully prepared for precise ICF experiments and solidly paves the way towards fusion ignition.Wanguo Zheng Xiaofeng Wei Qihua Zhu Feng Jing Dongxia Hu Xiaodong Yuan Wanjun Dai Wei Zhou Fang Wang Dangpeng Xu Xudong Xie Bin Feng Zhitao Peng Liangfu Guo Yuanbin Chen Xiongjun Zhang Lanqin Liu Donghui Lin Zhao Dang Yong Xiang Rui Zhang Fang Wang Huaiting Jia Xuewei Deng 2017Matter and Radiation at Extremes2017,2,5:13
3Microstructure and mechanical properties of FeCoNiCr high-entropy alloy strengthened by nano-Y_2O_3 dispersion显示文摘In this manuscript, the FeCrCoNi high entropy alloy strengthened by nano-Y_2 O_3 particles was synthesized via mechanical alloying and spark plasma sintering. Effects of Y_2 O_3 additions on the microstructure and mechanical properties were investigated.The oxide-dispersion-strengthened(ODS) high-entropy alloy bearing 5 wt% Y_2 O_3 was found to have a finer grain with respect to the single-phase face-centered cubic(FCC) alloy without oxides. Consequently, the yield strength increased from 654 to1754 MPa, and the fracture strength reached up to 2325 MPa while the plasticity decreased appreciably for the ODS high-entropy alloy. The synergic effects of grain size hardening and particle strengthening on mechanical properties of the ODS HEA were discussed. This finding indicates that the addition of nano-scaled oxides is an effective and feasible approach to designing HEAs with superior mechanical properties.jia bei liu xiongjun wang hui wu yuan lu zhaoping 2018Science China(Technological Sciences)2018,61,2:12
4Dynamic deformation behavior of a face-centered cubic FeCoNiCrMn high-entropy alloy显示文摘In this study, mechanical tests were conducted on a face-centered cubic Fe Co Ni Cr Mn high-entropy alloy,both in tension and compression, in a wide range of strain rates(10^(-4)–10~4 s^(-1)) to systematically investigate its dynamic response and underlying deformation mechanism. Materials with different grain sizes were tested to understand the effect of grain size, thus grain boundary volume, on the mechanical properties. Microstructures of various samples both before and after deformation were examined using electron backscatter diffraction and transmission electron microscopy. The dislocation structure as well as deformation-induced twins were analyzed and correlated with the measured mechanical properties.Plastic stability during tension of the current high-entropy alloy(HEA), in particular, at dynamic strain rates, was discussed in lights of strain-rate sensitivity and work hardening rate. It was found that, under dynamic conditions, the strength and uniform ductility increased simultaneously as a result of the massive formation of deformation twins. Specifically, an ultimate tensile strength of 734 MPa and uniform elongation of $63% are obtained at 2.3 × 10~3 s^(-1), indicating that the alloy has great potential for energy absorption upon impact loading.Junyang He Qi wang Husheng Zhang Lanhong Dai Toshiji Mukai Yuan Wu Xiongjun Liu Hui Wang Tai-Gang Nieh Zhaoping Lu 2018Science Bulletin2018,63,6:9
5Improving plasticity of the Zr46Cu46Al8 bulk metallic glass via thermal rejuvenation显示文摘In this paper,effects of cryogenic thermal cycling on deformation behavior and thermal stability of the Zr_(46)Cu_(46)Al_8bulk metallic glass(BMG)were studied.The results show that with the increase of the number of cryogenic thermal cycles(CTC),thermal stability remains almost unchanged,while the plasticity is increased,indicating that the cryogenic thermal cyclic treatment is an effective way to improve plasticity of metallic glasses without distinctly deteriorating thermal stability.Our analysis suggests that the increase in the defect density resulted from the cryogenic thermal treatments are responsible for the plasticity increment.Variation of yield strength can be well interpreted from microstructural percolation which affected by both density and characteristic volume of the defect sites.Wenli Song Xiaohe Meng Yuan Wu Di Cao Hui Wang Xiongjun Liu Xianzhen Wang Zhaoping Lu 2018Science Bulletin2018,63,13:9
6Atomic structures of Zr-based metallic glasses显示文摘The atomic structures of Zr-Ni and Zr-Ti-Al-Cu-Ni metallic glasses were investigated by using classical molecular dynamic (MD),reverse Monte Carlo (RMC),ab initio MD (AIMD) simulations and high resolution transmission electron microscopy (HRTEM) techniques. We focused on the short-range order (SRO) and medium-range order (MRO) in the glassy structure. It is shown that there are icosahedral,FCC-and BCC-type SROs in the Zr-based metallic glasses. A structural model,characterized by imperfect ordered packing (IOP),was proposed based on the MD simulation and confirmed by the HRTEM observation. Furthermore,the evolution from IOP to nanocrystal during the crystallization of metallic glasses was also ex-plored. It is found that the growth from IOP to nanocrystal proceeds through three distinct stages: the formation of quasi-ordered structure with one-dimensional (1D) periodicity,then 2D periodicity,and finally the formation of 3D nanocrystals. It is also noted that these three growth steps are crosslinked.HUI XiDong LIU XiongJun GAO Rui HOU HuaiYu FANG HuaZhi LIU ZiKui CHEN GuoLiang 2008Science China(Physics,Mechanics & Astronomy)2008,51,4:8
7Short-range ordering and its effects on mechanical properties of high-entropy alloys显示文摘In this letter,we briefly summarize experimental and theoretical findings of fo rmation and characterization of short-range orderings(SROs)as well as their effects on the defo rmation behavior of high-entropy alloys(HEAs).We show that existence of SROs is a common yet key structural feature of HEAs,and tuning the degree of SROs is an effective way for optimizing mechanical properties of HEAs.In additional,the challenges concerning about formation mechanism and characterization of SROs in HEAs are discussed,and future research activities in this regard are also proposed.Yuan Wu Fei Zhang Xiaoyuan Yuan Hailong Huang Xiaocan Wen Yihan Wang Mengyuan Zhang Honghui Wu Xiongjun Liu Hui Wang Suihe Jiang Zhaoping Lu 2021Journal of Materials Science & Technology2021,,3:8
8Magnetocaloric effect in Er-Al-Co bulk metallic glasses显示文摘A series of Er-Al-Co bulk metallic glasses (BMGs) have been prepared by the copper mold casting method. The glass forming ability and magnetocaloric effect (MCE) for these alloys have been investigated. The second-order magnetic transition from para-magnetic to ferromagnetic states takes place at about 9 K. These BMGs exhibit excellent MCE because of their large effective magneton number; Er56Al24Co20 BMG has a maximum entropy change and refrigeration capacity of 16.06 J kg-1 K-1 and 546 J kg-1,respectively,under the field of 50 kOe (10 kOe=795.775 kA/m) indicating that these BMGs are potential candidate magnetic materials for hydrogen liquefaction.HUI XiDong XU ZhiYi WU Yuan CHEN XiaoHua LIU XiongJun LU ZhaoPing 2011Chinese Science Bulletin2011,56,36:6
9Vacancy formation enthalpies of high-entropy FeCoCrNi alloy via first-principles calculations and possible implications to its superior radiation tolerance显示文摘Because atoms in high-entropy alloys(HEAs) coordinate in very different and distorted local environments in the lattice sites, even for the same type of constituent, their point defects could highly vary.Therefore, theoretical determination of the thermodynamic quantities(i.e., defect formation enthalpies)of various point defects is rather challenging because each corresponding thermodynamic quantity of all involve constituents is not unique. The knowledge of these thermodynamic quantities is prerequisite for designing novel HEAs and understanding the mechanical and physical behaviors of HEAs. However,to date there has not been a good method to theoretically derive the defect formation enthalpies of HEAs. Here, using first-principles calculations within the density functional theory(DFT) in combination of special quasi-random structure models(SQSs), we have developed a general method to derive corresponding formation enthalpies of point defects in HEAs, using vacancy formation enthalpies of a four-component equiatomic fcc-type FeCoCrNi HEA as prototypical and benchmark examples. In difference from traditional ordered alloys, the vacancy formation enthalpies of FeCoCrNi HEA vary in a highly wide range from 0.72 to 2.89 eV for Fe, 0.88–2.90 eV for Co, 0.78–3.09 eV for Cr, and 0.91–2.95 eV for Ni due to high-level site-to-site lattice distortions and compositional complexities. On average, the vacancy formation enthalpies of 1.58 eV for Fe, 1.61 eV for Cr, 1.70 eV for Co and 1.89 eV for Ni are all larger than that(1.41 eV) of pure fcc nickel. This fact implies that the vacancies are much more difficult to be created than in nickel, indicating a reasonable agreement with the recent experimental observation that FeCoCrNi exhibits two orders of amplitudes enhancement of radiation tolerance with the suppression of void formation at elevated temperatures than in pure nickel.Weiliang Chen Xueyong Ding Yuchao Feng Xiongjun Liu Kui Liu Z.P. Lu Dianzhong Li Yiyi Li C.T. Liu Xing-Qiu Chen 2018Journal of Materials Science & Technology2018,34,2:6
10The influence of various frequency chorus waves on electron dynamics in radiation belts显示文摘Non-adiabatic behaviour induced by the chorus-electron interaction is an important contributor to the radiation belt dynamics,and largely relies on wave frequency distribution.During the geomagnetic storm on August 2,2016,upper-band,lower-band and extremely low frequency(ELF)chorus waves were simultaneously observed within one orbit period of the Van Allen Probe B.Numerical simulations are performed to investigate the electron evolution by the observed chorus with different frequencies.The results show that various frequency chorus waves have different effects on electron dynamics.For chorus in the range f≈0.3 fce–0.7 fce,energy diffusion is the dominant process in electron evolutions.For chorus in the range 0.1 fce≤f≤0.25 fce,the pitch angle diffusion tends to be comparable to energy diffusion for Ek>0.5 MeV.For ELF chorus below 0.1 fce,the pitch angle diffusion rate is much above the energy diffusion rate,leading to potential scattering losses.HE JiaBei JIN Yu Yue XIAO FuLiang HE ZhaoGuo YANG Chang XIE YanQiong HE Qian WANG ChengZhi SHANG XiongJun LIU Si ZHOU QingHua ZHANG Sai 2021Science China(Technological Sciences)2021,64,4:3
11Generation of simultaneous H^(+)and He^(+)band EMIC waves in the nightside radiation belt显示文摘Previous studies have shown that EMIC waves occur preferentially in the afternoon sector of the magnetosphere.Here we report obliquely propagating H^(+)and He^(+)band EMIC waves detected by Van Allen Probe B in the region of MLT=22.7–23.5 during the June 20,2013 substorm.Using the correlated energetic proton data,we present continuous calculations on EMIC wave growth rates along the inward orbit in the region L=5.5–4.2.The modeled growth rate shows remarkable agreement with the observed double band EMIC waves in both temporal and spatial evolutions.The current results demonstrate that H^(+)and He^(+)band EMIC waves can be simultaneously excited in the midnight sector under appropriate conditions.GUAN ChunYi SHANG XiongJun XIE YanQiong YANG Chang ZHANG Sai LIU Si XIAO FuLiang 2020Science China(Technological Sciences)2020,63,11:3
12Progress of Jinping Underground laboratory for Nuclear Astrophysics(JUNA)显示文摘Jinping Underground laboratory for Nuclear Astrophysics(JUNA) will take the advantage of the ultra-low background of CJPL lab and high current accelerator based on an ECR source and a highly sensitive detector to directly study for the first time a number of crucial reactions occurring at their relevant stellar energies during the evolution of hydrostatic stars. In its first phase, JUNA aims at the direct measurements of^(25)Mg(p,γ)^(26)Al,^(19)F(p,α)^(16)O,^(13)C(α,n)^(16)O and ^(12)C(α,γ)^(16)O reactions. The experimental setup,which includes an accelerator system with high stability and high intensity, a detector system, and a shielding material with low background, will be established during the above research. The current progress of JUNA will be given.WeiPing Liu ZhiHong Li JiangJun He XiaoDong Tang Gang Lian Zhu An JianJun Chang Han Chen QingHao Chen XiongJun Chen ZhiJun Chen BaoQun Cui XianChao Du ChangBo Fu Lin Gan Bing Guo GuoZhu He Alexander Heger SuQing Hou HanXiong Huang Ning Huang BaoLu Jia LiYang Jiang Shigeru Kubono JianMin Li KuoAng Li Tao Li YunJu Li Maria Lugaro XiaoBing Luo HongYi Ma ShaoBo Ma DongMing Mei YongZhong Qian JiuChang Qin Jie Ren YangPing Shen Jun Su LiangTing Sun WanPeng Tan Isao Tanihata Shuo Wang Peng Wang YouBao Wang Qi Wu ShiWei Xu ShengQuan Yan LiTao Yang Yao Yang XiangQing Yu Qian Yue Sheng Zeng HuanYu Zhang Hui Zhang LiYong Zhang NingTao Zhang QiWei Zhang Tao Zhang XiaoPeng Zhang XueZhen Zhang ZiMing Zhang Wei Zhao Zuo Zhao Chao Zhou 2016Science China(Physics,Mechanics & Astronomy)2016,59,4:3
13Alloying effects of the elements with a positive heat of mixing on the glass forming ability of Al-La-Ni amorphous alloys显示文摘The effects of Sn and Ga additions on the glass forming ability(GFA)of(Al86La5Ni9)100 xSnx(x=0,0.2,0.3,0.5,0.7,1 and 2at.%)and(Al86La5Ni9)100 xGax(x=0,0.2,0.5,1 and 1.5 at.%)alloys were systematically investigated.Unlike common microalloying methods,both Sn and Ga have a positive heat of mixing with the main component of Al.Our analysis confirmed that proper Sn addition can suppress the strong formation ofα-Al and enhance the GFA due to the positive heat of mixing between Sn and Al and the large difference in their atomic sizes.While the addition of Ga to the base alloy acted as the nucleation cites forα-Al and accelerated precipitation of theα-Al phase,thus deteriorating the GFA.CHEN ZiPan GAO JingEn WU Yuan WANG Hui LIU XiongJun LU ZhaoPing 2014Science China(Physics,Mechanics & Astronomy)2014,57,1:3
14Interpretable machine-learning strategy for soft-magnetic property and thermal stability in Fe-based metallic glasses显示文摘Fe-based metallic glasses(MGs)have been extensively investigated due to their unique properties,especially the outstanding soft-magnetic properties.However,conventional design of soft-magnetic Fe-based MGs is heavily relied on“trial and error”experiments,and thus difficult to balance the saturation flux density(Bs)and thermal stability due to the strong interplay between the glass formation and magnetic interaction.Herein,we report an eXtreme Gradient Boosting(XGBoost)machine-learning(ML)model for developing advanced Fe-based MGs with a decent combination of Bs and thermal stability.Zhichao Lu Xin Chen Xiongjun Liu Deye Lin Yuan Wu Yibo Zhang Hui Wang Suihe Jiang Hongxiang Li Xianzhen Wang Zhaoping Lu 2020npj Computational Materials2020,,1:2
15Self-supporting nanoporous Ni/metallic glass composites with hierarchically porous structure for efficient hydrogen evolution reaction显示文摘Searching for free-standing and cost-efficient hydrogen evolution reaction(HER)electrocatalysts with high efficiency and excellent durability remains a great challenge for the hydrogen-based energy industry.Here,we report fabrication of a unique hierarchically porous structure,i.e.,nanoporous Ni(NPN)/metallic glass(MG)composite,through surface dealloying of the specially designed Ni_(40)Zr_(40)Ti_(20)MG wire.This porous composite is composed of micrometer slits staggered with nanometer pores,which not only enlarges effective surface areas for the catalytic reaction,but also facilitates the release of H2 gas.As a result,the NPN/MG hybrid electrode exhibited the prominent HER performance with a low overpotential of 78 m V at 10 m A cm^(-2)and Tafel slope of 42.4 m V dec^(-1),along with outstanding stability in alkaline solutions.Outstanding catalytic properties,combining with their free-standing capability and cost efficiency,make the current composite electrode viable for HER applications.Jing Wang Li You Zhibin Li Xiongjun Liu Rui Li Qing Du Xianzhen Wang Hui Wang Yuan Wu Suihe Jiang Zhaoping Lu 2021Journal of Materials Science & Technology2021,,14:2
16An improved self-calibration approach based on adaptive genetic algorithm for position-based visual servo显示文摘An improved self-calibrating algorithm for visual servo based on adaptive genetic algorithm is proposed in this paper. Our approach introduces an extension of Mendonca-Cipolla and G. Chesi's self-calibration for the position-based visual servo technique which exploits the singular value property of the essential matrix. Specifically,a suitable dynamic online cost function is generated according to the property of the three singular values. The visual servo process is carried out simultaneous to the dynamic self-calibration,and then the cost function is minimized using the adaptive genetic algorithm instead of the gradient descent method in G. Chesi's approach. Moreover,this method overcomes the limitation that the initial parameters must be selected close to the true value,which is not constant in many cases. It is not necessary to know exactly the camera intrinsic parameters when using our approach,instead,coarse coding bounds of the five parameters are enough for the algorithm,which can be done once and for all off-line. Besides,this algorithm does not require knowledge of the 3D model of the object. Simulation experiments are carried out and the results demonstrate that the proposed approach provides a fast convergence speed and robustness against unpredictable perturbations of camera parameters,and it is an effective and efficient visual servo algorithm.Ding LIU Xiongjun WU Yanxi YANG 2008控制理论与应用(英文版)2008,6,3:1
17Effects of density difference of constituent elements on glass formation in TiCu-based bulk metallic glasses显示文摘Glass formation is generally favored by a large atomic size mismatch among constituent elements,which usually leads to large density differences among them as well.During melting,elemental segregation occurs due to Stokes' law and then inevitably affects glass formation.In this paper,such effects on glass-forming ability in a TiCu-based alloy system have been demonstrated.In the bulk glassforming composition Ti43Cu42Hf14Si1,macroscopic segregation of Si was observed in the as-melted ingots and silicon was completely depleted in the as-cast rods.In another Ti33Cu47Ni8Zr11Si1 alloy,nevertheless,the effects of density differences among the constituent elements were less severe.It was also confrmed that using proper pre-alloys could be an effective way in alleviating the side effects of the elemental segregation.Zhongyan Zhang Zengbao Jiao Jie Zhou Yuan Wu Hui Wang Xiongjun Liu Zhaoping Lu 2013Progress in Natural Science:Materials International2013,23,5:1
18Local chemical ordering and its impact on radiation damage behavior of multi-principal element alloys显示文摘Multi-principal element alloys(MPEAs)have attracted much attention as future nuclear materials due to their extraordinary radiation resistances.In this work,we have elucidated the development of local chemical orderings(LCOs)and their influences on radiation damage behavior in the typical CrFeNi MPEA by hybrid-molecular dynamics and Monte Carlo simulations.It was found that considerable LCOs consist-ing of the Cr-Cr and Ni-Fe short-range orders existed in the ordered configuration with optimized system energy.Through modeling the accumulation cascades up to 1000 recoils,we revealed that the size of de-fect clusters and dislocation loops is smaller in the ordered configuration than those in the random one,although the former formed more Frenkel pairs(i.e.,self-interstitials and vacancies).In addition,the dis-tribution of dislocation loops is relatively more dispersed in the ordered configuration,and the stair-rod dislocations related to irradiation swelling are also smaller,implying that the existence of LCOs is con-ducive to enhancing radiation damage tolerance.To understand the underlying mechanism,the effects of LCOs on the formation and evolution of defects and radiation resistance were discussed from the aspects of atomic bonding,migration path,and energy of defect diffusion,which provides theoretical guidance for the design of MPEAs with enhanced radiation resistance.Leqing Liu Xiongjun Liu Qing Du Hui Wang Yuan Wu Suihe Jiang Zhaoping Lu 2023Journal of Materials Science & Technology2023,,4:1
19Elevated nuclear PIGL disrupts the cMyc/BRD4 axis and improves PD-1 blockade therapy by dampening tumor immune evasion显示文摘To improve the efficacy of lenvatinib in combination with programmed death-1(PD-1)blockade therapy for hepatocellular carcinoma(HCC),we screened the suppressive metabolic enzymes that sensitize HCC to lenvatinib and PD-1 blockade,thus impeding HCC progression.After analysis of the CRISPR‒Cas9 screen,phosphatidylinositol-glycan biosynthesis class L(PIGL)ranked first in the positive selection list.PIGL depletion had no effect on tumor cell growth in vitro but reprogrammed the tumor microenvironment(TME)in vivo to support tumor cell survival.Specifically,nuclear PIGL disrupted the interaction between cMyc/BRD4 on the distant promoter of target genes and thus decreased the expression of CCL2 and CCL20,which are involved in shaping the immunosuppressive TME by recruiting macrophages and regulatory T cells.PIGL phosphorylation at Y81 by FGFR2 abolished the interaction of PIGL with importinα/β1,thus retaining PIGL in the cytosol and facilitating tumor evasion by releasing CCL2 and CCL20.Clinically,elevated nuclear PIGL predicts a better prognosis for HCC patients and presents a positive correlation with CD8+T-cell enrichment in tumors.Clinically,our findings highlight that the nuclear PIGL intensity or the change in PIGL-Y81 phosphorylation should be used as a biomarker to guide lenvatinib with PD-1 blockade therapy.Hua Yu Tiezhu Shi Linli Yao Dongwei Xu Yufeng Ding Qiang Xia Wei Liu Xiongjun Wang 2023Cellular & Molecular Immunology2023,20,8:1
20Corrosion and irradiation behavior of Fe-based amorphous coating in lead-bismuth eutectic liquids显示文摘Lead-bismuth eutectics (LBE) have considerable potential as a candidate material for accelerator-driven sub-critical systems(ADS).However,LBE corrosion and irradiation damage are two urgent challenges remaining to be solved for impellers of primary pumps.In this study,we have explored the possibility of using Fe-based amorphous coatings to overcome LBE corrosion and concurrently to sustain irradiation damage.Specifically,the Fe_(54)Cr_(18)Mo_(2)Zr_(8)B_(18)amorphous coating was prepared by high-velocity oxygen-fuel (HVOF) spraying on 316L steel and exposed to saturated oxygen static LBE for 500 h at 400℃.The coating with high thermal stability (T_(g)=615℃ and T_(x)=660℃) effectively prevented the substrate steel from being corroded by LBE owing to its unique long-range disordered atomic packing.The coating also exhibited strong irradiation resistance when being subjected to 45 dpa (displacement per atom) Au ion irradiation at room temperature,with no sign of crystallization even at the maximum implantation depth of 300 nm.Consequently,the hardness of the coatings before and after irradiation increased slightly.The current findings shed new insights into understanding corrosion mechanism and irradiation behavior of amorphous solids in LBE and expand the application range of amorphous materials.LU ZhiChao PENG Xiang Yang TANG YuHai HAN ShuYin WU Yuan FU EnGang DING XiangBin HOU Shuo LU GuangYao CAO PeiPei ZHANG YiBo LIU XiongJun MA Dong WANG Hui JIANG SuiHe LU ZhaoPing 2022Science China(Technological Sciences)2022,65,2:1
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