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| 1 | First-principles calculation of dehydrogenating properties of MgH_2-V systems显示文摘Based on experimental results in which VH0.81/MgH2 interface was found during the process of mechanically milling MgH2+5at%V nanocomposite, a VH/MgH2 in- terface is designed and constituted in this work. A first-principles plane-wave pseudopo- tential method based on Density Functional Theory (DFT) has been used to investigate the vanadium alloying effects on the dehydrogenating properties of magnesium hydride, i.e., MgH2. A low absolute value of the negative heat of formation of VH/MgH2 interface compared with that of MgH2 indicates that vanadium hydrides befit to improve the dehydrogenating properties of MgH2. Based on the analysis of the density of states (DOS) and the total valence electron density distribution of MgH2 before and after V alloying, it was found that the improvement of the dehydrogenating properties of MgH2 caused by V alloying originates from the increasing of the valence electrons at Fermi level (EF) and the decreasing of the HOMO-LUMO gap ( Δ E H ?L) after V alloying. The catalysis effect of V on dehydrogenating kinetics of MgH2 may attribute to a stronger bonding between V and H atoms than that between Mg and H atoms, which leads to nucleation of the α-Mg at the VH/MgH2 interface in the MgH2-V systems easier than that in pure MgH2 phase. | ZHOU Dianwu PENG Ping LIU Jinshui | 2006 | Science China(Technological Sciences)2006，49，2： | 10 |
| 2 | Study on hydrogen atom adsorption and diffusion properties on Mg (0001) surface显示文摘Hydrogen atom adsorption and diffusion properties on clean and vacancy defective Mg (0001) surface have been investigated systematically by using a first-principles calculations method based on the density functional theory. The calculation results of adsorption energy and diffusion energy barrier show that hydrogen atom is apt to be adsorbed at fcc and hcp sites on clean Mg (0001) surface, and fcc adsorption site is found to be more preferred. The highest diffusion energy barrier is estimated as 0.6784 eV for the diffusion of hydrogen from clean Mg (0001) surface into its bulk. Surface effects, which affect hydrogen diffusion obviously, results in a slow diffusion velocity of hydrogen from surface to subsurface, while a fast one from subsurface to bulk, indicating the range of surface effects is only restricted within two topmost layers of Mg (0001) surface. Comparatively, Mg atom vacancy on Mg (0001) surface not only enhances the chemisorption interaction between H and Mg surface, but also benefits H atom diffusion in Mg bulk with relatively more diffusion paths compared with that of clean surface. Besides, hydrogen atom is found to occupy mostly the tetrahedral interstice when it diffuses into the Mg bulk. Further analysis of the density of states (DOS) shows that the system for hydrogen atom to be adsorbed at fcc site has a lower DOS value (N (EF)) at Fermi level and more bonding elec- trons at the energy range blow the Fermi level of H/Mg (0001) system as compared with that at hcp site. On the other hand, the enhanced chemisorption interaction between hydrogen and defective surface should be attributed to the fact that the electronic structures of Mg (0001) surface are modified by an Mg vacancy, and the bonding electrons of the topmost layer Mg atoms are transferred from low energy range to Fermi level, which is in favor of improving the surface activity of Mg (0001) surface. | ZHANG Jian ZHOU DianWu LIU JinShui | 2009 | Science China(Technological Sciences)2009，52，7： | 4 |
| 3 | Improving the cycle stability of FeCl3-graphite intercalation compounds by polar Fe2O3 trapping in lithium-ion batteries显示文摘FeCI3-intercalated graphite intercalation compounds (GICs) with high reversible capacity and high volumetric energy density are attractive anode material alternatives of commercial graphite. However, the rapid capacity decay, which was induced by chloride dissolution and shuttling issues, hindered their practical application. To address this problem, here, we introduce flake-like Fe2O3 species with inherently polar surface on the edge of FeCl3 -intercalated GICs through microwave-assisted transformation of a fraction of FeCl3 component. Theoretical simulations and physical/electrochemical studies demonstrate that the introduced Fe2O3 component can afford sufficient polar active sites for chemically bonding the soluble FeCl3 and LiCl species based on the polar-polar interaction mechanism, further inhibiting the outward diffusion of the chlorides and immobilizing them within the GIC material. In a lithium ion cell, the FeCl3 -intercalated GIC with a suitable Fe2O3 content shows remarkably improved cycling stability with a high reversible capacity of 1,041 mAh·g^-1 at a current density of 200 mA·g^-1. Capacity retention of 91 % is achieved at a high current density of 1,000 mA·g^-1 over 300 cycles. This work opens up the new prospect for immobilizing chlorides by introducing inorganic species in GIC for long-cycle electrochemical batteries. | Zheng Li Chengzhi Zhang Fei Han Fuquan Zhang Dianwu Zhou Shaohua Xu Hongbo Liu Xuanke Li Jinshui Liu | 2019 | Nano Research2019，12，8： | 4 |
| 4 | Numerical simulation of hot stamping of side impact beam显示文摘Ls-DYNA software is adopted to conduct research of numerical simulation on hot stamping of side impact beam to calculate the temperature field distribution,stress field distribution,forming limit diagram(FLD) figure,etc.in the course of hot stamping so as to predict and analyze the formability of parts.ProCAST software is employed to conduct research of numerical simulation on solid quenching course concerning hot stamping to calculate temperature field distribution of tools and component of multiple stamping cycles.The results obtained from numerical simulation can provide significant reference value to hot stamping part design,formability predication and tools cooling system design. | Guo Yihui Ma Mingtu Fang Gang Song Leifeng Liu Qiang Wang Xiaona Zhou Dianwu | 2012 | Engineering Sciences2012，10，6： | 4 |
| 5 | Capacity of orthogonal space-time block codes in MISO fading channels with co-channel interference and noise显示文摘Orthogonal space-time block codes(OSTBCs) are an efficient mean in order to exploit the diversity offered by the wireless multiple-input multiple-output(MIMO) channel. This paper considers capacity problems of OSTBCs over spatially correlated multiple-input single-out(MISO) Rayleigh fading channels in the presence of spatially correlated Rayleigh co-channel interference and additive Gaussian noise,and derives exact expressions of the ergodic capacity and outage probability(capacity distribution) for such OSTBCs. Some numerical examples are given to illustrate the effect of co-channel interference on the ergodic and outage capacity of OSTBCs. | YUE DianWu WANG Qian | 2009 | Science in China(Series F)2009，52，9： | 2 |
| 6 | Orbital ordering and fluctuations in a kagome superconductor CsV_(3)Sb_(5)显示文摘Recently,competing electronic instabilities,including superconductivity and density-wave-like order,have been discovered in vanadium-based kagome metals AV_(3)Sb_(5)(A=K,Rb,Cs)with a nontrivial band topology.This finding stimulates considerable interest to study the interplay of these competing electronic orders and possible exotic excitations in the superconducting state.Here,we performed51V and133Cs nuclear magnetic resonance(NMR)measurements on a CsV_(3)Sb_(5)single crystal to clarify the nature of density-wave-like transition in these kagome superconductors.A first-order structural transition is unambiguously revealed below T_(s)~94 K by observing the sudden splitting of Knight shift in^(51)V NMR spectrum.Moreover,combined with^(133)Cs NMR spectrum,the present result confirms a three-dimensional structural modulation.By further analyzing the anisotropy of Knight shift and 1/T_(1)T at^(51)V nuclei,we proposed that the orbital order is the primary electronic order induced by the firstorder structural transition,which is supported by further analysis on electric field gradient at^(51)V nuclei.In addition,the evidence for possible orbital fluctuations is also revealed above T_(s).The present work sheds light on a rich orbital physics in kagome superconductors AV_(3)Sb_(5). | DianWu Song LiXuan Zheng FangHang Yu Jian Li LinPeng Nie Min Shan Dan Zhao ShunJiao Li BaoLei Kang ZhiMian Wu YanBing Zhou KuangLv Sun Kai Liu XiGang Luo ZhenYu Wang JianJun Ying XianGang Wan Tao Wu XianHui Chen | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，4： | 2 |
| 7 | Acidic deposition and its effects in southwestern China显示文摘 | Hans M. Skip Zhao Dianwu Xiong Tiling Zhao Dawei Thorj?rn Larssen Liao Bohan Rolf D. Vogt | 1995 | Water Air & Soil Pollution1995，，4： | 1 |
| 8 | Assessing effects of acid deposition in Southwestern China using the magic model显示文摘 | Zhao Dianwu Hans Martin Seip | 1991 | Water Air and Soil Pollution (-)1991，，1： | 1 |
| 9 | A General Parame-terization Quantifying Performance in Energy Detection显示文摘 | Wang Qian Yue Dianwu | 2009 | IEEE Signal Processing Letters2009，16，8： | 1 |
| 10 | Critical load of sulfur deposition for ecosystemand its application in China显示文摘Current situation of air pollution of China is introduced. Critical loads for 4 types of soil in sensitiveareas of China have been calculated using methods of SSMB, Profile Medel and Magic Medel. Maps of criticalload , sulfur deposition of 1 990 and excee | Zhao Dianwu Zhang Xiaoshan Yang Jianxin(Research Center for Eco-Environrnental Sciences , Chinese Academy of Sceiences, Beijing 100085, China)Mao Jietai(Department of Geophysics, Peking University. Beijing 100871 . China)Xiong Jiling(Guizhou Institute o | 1995 | Journal of Environmental Sciences1995，7，3： | 1 |
| 11 | Assessing effects of acid deposition in Southwestern China using the magic model显示文摘 | Zhao Dianwu Hans Martin Seip | 1991 | Water Air and Soil Pollution (-)1991，，1： | 1 |
| 12 | Sulfur dioxide-hydrogen peroxide relationships and acidification of precipitation in Guiyang area-a case study显示文摘-The concentrations of gas phase SO2, O3 and chemical composition of sequential rainwater samples were measured on 6/11/88 to 6/28/88 at some sites of Guiyang area. S (IV) was present in great excess of H2O2 in rainwater samples collected at residential sites of the city corresponding to high level of gas phase SO2. Considerable H2O2 in rainwater samples was observed in background air at suburbs. The evidence that clean rainwater samples were collected at 20km away from the city in 6/18/88 precipitation event revealed that the major process of acidification of the rain in the high polluted areas was below-cloud scavenging of trace gases. From a simulation calculation it was found that the rate of oxidation of S(IV) by O3 and by Mn2+, Fe3+ catalytic in high pH rainwater is significant, but for low pH the major SO42- is produced by the reaction of S (IV) with H2O2. | Shen Ji, Zhao Qianxue, Zhang Xiaoshan, Zhang Baozhu, Zhao Dianwu, Fan Zenghua and Cheng PanjiangResearch Center for Eco-Environmental Sciences,Academia SinicaGuizhou Institute of Environmental SciencesSichuan Istitute of Environmental Research and Monitoring | 1991 | Journal of Environmental Sciences1991，3，1： | 1 |
| 13 | Estimation of anthropogenic ammonia emission in Asia 显示文摘 | Zhao Dianwu Wang Anpu | 1994 | Atmospheric Environment1994，28，4： | 1 |
| 14 | Acidic deposition and its effects in southwestern China显示文摘 | Hans M. Skip Zhao Dianwu Xiong Tiling Zhao Dawei Thorj?rn Larssen Liao Bohan Rolf D. Vogt | 1995 | Water Air & Soil Pollution1995，，4： | 1 |
| 15 | Microstructure and properties of laser direct deposited nickel base superalloy 显示文摘 | Zhang Yongzhong Gao Shiyou Shi Likai Wang Dianwu | 2007 | Journal of Advanced Materials2007，，2： | 1 |
| 16 | Dynamic overlapped spectrum allocation based on potential game in cognitive radio networks显示文摘In order to make full use of wireless spectrum resources,the behavior of cognitive radio(CR)for dynamic spectrum allocation is analyzed based on the game theoretic framework.The traditional spectrum allocation schemes consider the spectrum allocation among independent frequency bands only,without taking into account mutually overlapped frequency bands.For this reason,an optimal allocation etiquette is defined to promote the cross characteristic of the frequency bands in a dynamic spectrum allocation model.New interference operator and interference temperature constraints are introduced in order to realize calculation of the interference,and the corresponding spectrum allocation scenario can be further formulated as a potential game.Based on the characteristic of dynamic selection using the game theory and the interference avoidance rule of interference temperature,the robustness of CR networks is increased and the scenario is more suitable for the dynamic changing of actual wireless communication and energy saving communication systems.Simulation results show that the signal to interference and noise ratio(SINR) level can be significantly improved through the optimal allocation of any available spectrum.The utilization rate of spectrum and throughput of overall CR networks are increased by fully utilizing the spectrum resources in the dynamic spectrum allocation model. | 贾亚男 Yue Dianwu | 2014 | High Technology Letters2014，20，4： | 1 |
| 17 | Acid rain: China, United States, and a remote area 显示文摘 | Galloway J N Dianwu Z Jiling X | 1987 | Science1987，236，4808： | 1 |
| 18 | The existence and nonexistence of positive solutions to a discrete fractional boundary value problem with a parameter显示文摘 | Han Zhenlai Pan Yuanyuan Yang Dianwu | 2014 | Applied Mathematics Letters2014，36，1： | 1 |
| 19 | Agricultural Production System of Chestnut soil in Hebei Plateau and Maintenanceof soil Quality显示文摘AgriculturalProductionSystemofChestnutsoilinHebeiPlateauandMaintenanceofsoilQuality￥ChuDahua;YangSizhi;WangDianwu;XiaoKai(Heb... | Chu Dahua Yang Sizhi Wang Dianwu XiaoKai(Hebei Agricultural University,Baoding 071001) | 1995 | 河北农业大学学报1995，18，S1： | 0 |
| 20 | Partition-Turbo Decoding of Linear Block Codes显示文摘 | YUE Dianwu Ha Hoang Nguyen Ed Shwedyk | 2006 | Chinese Journal of Electronics2006，15，2： | 0 |
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