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Influence of magnesium content on structure and electrochemical properties of La_(1-x)Mg_xNi_(1.75)Co_(2.05) hydrogen storage alloys

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Journal of Rare Earths 2016年第12期34卷 1235-1240页

作者：蔡鑫魏范松胥小丽张玉 School of Materials science and Engineering Jiangsu University of Science and Technology

La（1-x）MgxNi（1.75）Co（2.05）（x=0.07, 0.08, 0.10, 0.13, 0.15） alloys were prepared by high-frequency inductive method, and then their structure and electrochemical properties were investigated systematically. The XRD analysis revealed that the alloys consisted of LaNi5 phase and La4MgNi（19）（Ce5Co（19）＋ Pr5Co（19）） phase, and the introduction of Mg could promote the formation of La4MgNi（19） phase. The observation of microstructure showed that all the alloys processed dendritic structure, which was refined with the increase of x value. The electrochemical measurements showed that all the alloys could be activated within 2 cycles, and with increasing x, the maximum discharge capacity obviously increased from 254.00 m Ah/g（x=0.07） to 351.51 mAh/g（x=0.15）, but the cycling stability（S（80）） decreased somehow from 78.4% to 73.9%. Meanwhile, the appropriate addition of Mg could improve the high-rate discharge capacity（HRD） of the alloy electrodes, which was mainly controlled by the electrochemical reaction rate on the surface of the alloys.

关键词： A5B19-type hydrogen storage alloy phase structure electrochemical properties rare earths

Effects of hot deformation and in-situ ZrB2 particle on microstructure and tensile performance of AA7085 composite sheets

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Journal of Iron and Steel Research International 2024年第7期31卷 1778-1791页

作者： Jiang-jing Wu Xi-zhou Kai Chuang Guan Yu-tao Zhao School of Material science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

To provide a new idea to reduce anisotropy for sheets in the thickness direction by microstructure modification and,mean-while,maintain or even enhance tensile performance,the in-situ ZrB2 particle/AA7085 composite sheets with thicknesses of 1,2,3,and 6 mm were *** as-cast grain size was significantly refined by the heterogeneous nucleus of the ZrB2 *** microstructure results show that severe hot deformation converts as-cast disordered microstructure into a sequential microstructure by crushing the remanent phases and matrix into a fiber *** the solid solution and aging heat treatment,the composite sheets exhibit largely recrystallized grains compared with partially recrystallized grains in the matrix sheets,and weak or even free texture exists in the *** grain size in the composite sheets decreases with the increase in thickness *** the thickness range of 1-3 mm,the composite sheets maintain a similar tensile per-formance as that in matrix sheets,while the strength and ductility in the 6-mm-thick composite sheet are improved.

关键词： Composite sheet Grain structure Texture Dislocation Strengthening

Repetitive traumatic brain injury–induced complement C1–related inflammation impairs long-term hippocampal neurogenesis

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Neural Regeneration Research 2025年第3期20卷 821-835页

作者： Jing Wang Bing Zhang Lanfang Li Xiaomei Tang Jinyu Zeng Yige Song Chao Xu Kai Zhao Guoqiang Liu Youming Lu Xinyan Li Kai Shu Department of Neurosurgery Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina Department of Neurosurgery Shanxi Bethune HospitalShanxi Academy of Medical SciencesTongji Shanxi HospitalThird Hospital of Shanxi Medical UniversityTaiyuanShanxi ProvinceChina Department of Pathophysiology School of Basic Medicine and Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina Institute for Brain Research Wuhan Center of Brain ScienceHuazhong University of Science and TechnologyWuhanHubei ProvinceChina Department of Graduate Student Chongqing Medical UniversityChongqingChina Department of Basic Medicine School of Medical ScienceHubei University for NationalitiesEnshiHubei ProvinceChina Department of Anatomy School of Basic Medicine and Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina

Repetitive traumatic brain injury impacts adult neurogenesis in the hippocampal dentate gyrus,leading to long-term cognitive ***,the mechanism underlying this neurogenesis impairment remains *** this study,we established a male mouse model of repetitive traumatic brain injury and performed long-term evaluation of neurogenesis of the hippocampal dentate gyrus after repetitive traumatic brain *** results showed that repetitive traumatic brain injury inhibited neural stem cell proliferation and development,delayed neuronal maturation,and reduced the complexity of neuronal dendrites and *** with repetitive traumatic brain injuryalso showed deficits in spatial memory ***,following repetitive traumatic brain injury,neuroinflammation was enhanced in the neurogenesis microenvironment where C1q levels were increased,C1q binding protein levels were decreased,and canonical Wnt/β-catenin signaling was *** inhibitor of C1 reversed the long-term impairment of neurogenesis induced by repetitive traumatic brain injury and improved neurological *** findings suggest that repetitive traumatic brain injury–induced C1-related inflammation impairs long-term neurogenesis in the dentate gyrus and contributes to spatial memory retrieval dysfunction.

关键词： complement C1 dendrite dentate gyrus hippocampus neural stem cell neurogenesis neuroinflammation neurological function neuron traumatic brain injury

Effect of artificial tribological layer on sliding wear behavior of H13 steel

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Journal of Iron and Steel Research International 2017年第9期24卷 943-949页

作者： Zhen Cao Shu-qi Wang Ke-zhi Huang Bo Zhang Guo-hong Wen Qiu-yang Zhang Lan Wang School of Material science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

An artificial tribological layer was formed on the worn surface during sliding,through supplying MoS_2,Fe_2O_3 or their equiponderant mixtures onto the sliding interface of H13/GCr15 *** effect of this tribological layer on the wear behavior of H13 steel was *** worn surfaces and subsurfaces of H13 steel were thoroughly characterized by using X-ray diffraction（XRD）,scanning electron microscopy（SEM）and energy dispersive spectrometry（EDS）;the wear mechanisms were *** research results demonstrated that tribological layer did not exist during sliding of H13 steel with no additive,but it formed with the addition of MoS_2,Fe_2O_3 or their equiponderant *** there was no tribological layer,the wear rate rapidly increased with an increase of the *** this case,adhesive and abrasive wear *** the additives were supplied,the artificial tribological layer was observed to be immediately formed and stably existed on worn *** tribological layer presented an obvious protective function from wear and ***,the wear rate and friction coefficient were significantly ***_2 as tribological layer seemed to present more obvious protective function than Fe_2O_*** supplying their mixture,the artificial tribological layer possessed not only the load-carrying capacity of Fe_2O_3,but also the lubricative capacity of MoS_*** two simultaneous capacities could improve the friction and wear properties of H13 steel further.

关键词： H13 steel Artificial tribological layer Wear behavior Wear mechanism

Influence of Ag content on the microstructure, mechanical, and tribological properties of TaVN–Ag films

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International Journal of Minerals,Metallurgy and Materials 2018年第1期25卷 110-115页

作者： Tong Chen Li-hua Yu Jun-hua Xu School of Material science and Engineering Jiangsu University of Science and Technology

A series of TaVN-Ag nanocomposite films were deposited using a radio-frequency magnetron sputtering system. The micro- structure, mechanical properties, and tribological performance of the films were investigated. The results showed that TaVN-Ag films were composed of face-centered cubic （fcc） TaVN and fcc-Ag. With increasing Ag content, the hardness of TaVN-Ag composite films first in- creased and then decreased rapidly. The maximum hardness value was 31.4 GPa. At room temperature, the coefficient of friction （COF） of TaVN-Ag films decreased from 0.76 to 0.60 with increasing Ag content from 0 to 7.93at%. For the TaVN-Ag films with 7.93at% Ag, COF first increased and then decreased rapidly from 0.60 at 25℃ to 0.35 at 600℃, whereas the wear rate of the film increased continuously from 3.91 × 10^-7 to 19.1 × 10^7 mm3/（N·mm）. The COF of the TaVN-Ag film with 7.93at% Ag was lower than that of the TaVN film, and their wear rates showed opposite trends with increasing temperature.

关键词： TaVN-Ag films RF magnetron sputtering microstructure mechanical properties tribological performances

Influence of heat treatments on incipient melting structures of DD5 nickel-based single crystal superalloy

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China Foundry 2023年第5期20卷 395-402页

作者： Zhi-hong Jia Chen-yang Li Wen-xiang Jing Xiang-feng Liang Ze-kun Zhang Jia-le Xiao Yu-tao Zhao School of Materials science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

The evolution of microstructure and formation mechanism of incipient melting microstructure of DD5 single crystal superalloy during solution heat treatment were studied by scanning electron microscopy(SEM),electron probe microanalysis(EPMA),and energy dispersive spectroscopy(EDS).The solidus and liquidus of single crystal alloy were obtained by differential scanning calorimetry(DSC).Results show that the mosaic-like eutectic and fan-like eutectic are dissolved at first,and the coarseγ'phase is dissolved later during the solution heat treatment of 1,390°C/2 h+1,310°C/4 h+1,320°C/10 h+air cooling(AC).The composition segregations of Al,Ta,W and Re are 0.99,0.96,1.04 and 1.16,respectively,which close to *** incipient melting is caused by the low local temperature of the alloy,and the micropore region with a lower melting point is the preferred position for incipient melting.

关键词： superalloy solution heat treatment eutectic composition segregation incipient melting

Modelling and numerical simulation of isothermal oxidation of an individual magnetite pellet based on computational fluid dynamics

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Journal of Iron and Steel Research International 2021年第7期28卷 799-808页

作者： Zhou Pu Feng Zhou Yue Sun Ming Zhang Bo-quan Li Department of Instrumentation science and Technology Jiangsu UniversityZhenjiang 212013JiangsuChina

A mathematical model based on the computational fluid dynamics method,heat and mass transfer in porous media and the unreacted shrinking core model for the oxidation reaction of an individual magnetite pellet during preheating was *** commercial software COMSOL Multiphysics was used to simulate the change in the oxidation degree of the pellet at different temperatures and oxygen concentrations,and the simulated results were compared with the exper-imental *** model considered the influence of the exothermic heat of the reaction,and the enthalpy change was added to calculate the heat released by the *** results show that the oxidation rate on the surface of the pellet is much faster than that of the inside of the *** and oxygen concentration have great influence on the pellet oxidation ***,the exothermic calculation results show that there is a non-isothermal phenomenon inside the pellet,which leads to an increase in temperature inside the single *** the preheating condition of 873-1273 K(20%oxygen content),the heat released by the pellet oxidation reaction in a chain grate is 7.8×10^(6)-10.8×10^(6) kJ/h,which is very large and needs to be considered in the magnetite pellet oxidation modelling.

关键词： Magnetite pellet Oxidation Numerical simulation Unreacted shrinking core model Computational fluid dynamics

The analysis of complex behaviours of a novel three dimensional autonomous system

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Chinese Physics B 2010年第7期19卷 156-166页

作者：董高高郑松田立新杜瑞瑾孙梅 Research Center for Nonlinear science Faculty of ScienceJiangsu University

This paper introduces a new three dimensional autonomous system with five equilibrium points. It demonstrates complex chaotic behaviours within a wide range of parameters, which are described by phase portraits, Lyapunov exponents, frequency spectrum, etc. Analysis of the bifurcation and Poincar@ map is used to reveal mechanisms of generating these complicated phenomena. The corresponding electronic circuits are designed, exhibiting experimental chaotic attractors in accord with numerical simulations. Since frequency spectrum analysis shows a broad frequency bandwidth, this system has perspective of potential applications in such engineering fields as secure communication.

关键词： three dimensional autonomous system chaotic attractor electronic circuit frequency spectrum

Arc Behavior and Droplet Transfer of CWW CO_2 Welding

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Journal of Iron and Steel Research International 2016年第8期23卷 808-814页

作者： Zhi-dong YANG Chen-fu FANG Yong CHEN Guo-xiang XU Qing-xian HU Xiao-yan GU School of Materials science and Engineering Jiangsu University of Science and Technology

Cable-type welding wire（CWW）CO2 welding is an innovative process arc welding with high quality,high efficiency and energy saving,in which CWW is used as consumable *** CWW is composed of seven wires with a diameter of *** is in the center,while others uniformly distribute around *** diameter of twisted wire is up to 3.6mm,which can increase the deposition rate *** continual wire-feeding and melting of CWW,the formed rotating arc improved welding quality *** arc behavior and droplet transfer were observed by the electrical signal waveforms and corresponding synchronous images,based on the high speed digital camera and electrical signal *** results showed that the shape of welding arc changed from bell arc to beam arc with the increase of welding *** droplet transfer mode changed from repelled transfer,globular transfer to projected transfer in *** transfer frequency increased from 18.17 Hz to 119.05 Hz,while the droplet diameter decreased from 1.5times to 0.3times of the CWW diameter.

关键词： welding Welding droplet camera rotating projected melting distribute innovative frames