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Enhancing strength and ductility in back extruded WE71 magnesium alloy cylindrical parts by introduction of multi-direction forging process

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Journal of Rare Earths 2023年第3期41卷 462-470,I0006页

作者： Dehao Bu Ting li Xiaolei Han Zhiwei Du Jiawei Yuan Kui Zhang Yongjun li Yonggang Peng zheng Pang Chunlei Zhao National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials GRINM Group Co.Ltd.Beijing 100088China Guobiao(Beijing)Testing&Certification Co. Ltd.China United Test&Certification Co.Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China State Key Laboratory for Fabrication and Processing of Non-Ferrous Metals GRIMAT Engineering Institute Co.Ltd.Beijing 101407China Gaona Aero Material Co. Ltd.Beijing 100081China

Magnesium cylindrical parts have relatively poor mechanical properties and distinct anisotropy of microstructure,which hinder their application as structural *** improve the performance of WE71 cylindrical parts,multi-direction forging(MDF)was introduced before back extrusion,and the microstructure and mechanical properties were *** of microstructure show that the grain size in the outer of the cylindrical bottom is refined from 30.1 to 27.7μm,the micro structure is more uniform and the dislocation density is *** bimodal grain structure is formed in the outer of the cylindrical wall,which is ascribed to the formation of MgsRE phases along grain *** phases result in the Zener pinning effect on grain boundaries and the reduction of DRX volume *** texture type of the cylindrical bottom is‖ED and the cylindrical wall is‖ED,and the maximum pole intensity is 1.986 and 1.664,*** of the tensile test at room temperature show that combined improved strength and ductility of the cylindrical part is attained after introducing the MDF *** ultimate tensile strength(UTS),yield strength(YS)and elongation are279 MPa,185 MPa and 12%at the bottom and 299 MPa,212 MPa and 20%at the wall.

关键词： WE71 magnesium alloy Multi-direction forging Backward extrusion Bimodal grain structure Rare earths

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Uneven Evolution of Microstructure,Magnetic Properties and Coercivity Mechanism of Mo-Substituted Nd-Ce-Fe-B Alloys

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Acta Metallurgica Sinica(English Letters) 2021年第4期34卷 590-596页

作者： li-li Zhang Jie Song Sajjad Ur Rehman Jia-Jie li Lei Wang Mu-Nan Yang Ren-Hui liu Qing-zheng Jiang Zhen-Chen Zhong Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices/Institute for Rare Earth Magnetic Materials and Devices Jiangxi University of Science and TechnologyGanzhou341000China Fujian Changting Golden Gragon Rare-Earth Co. LtdChangting366300China

The purpose of this paper is to study the influence of Mo addition on the phase morphologies,microstructures and magnetic properties of the designated *** is found out that the coercivity H_(cj) increases unevenly from 12.2 kOe for(Nd_(0.8)Ce_(0.2))_(13)Fe_(82)B_(5) to the maximum value of 13.3 kOe for(Nd_(0.8)Ce_(0.2))_(13)Fe_(80)B_(5)Mo_(2).The transmission electron microscopy images demonstrate that the grain size decreases with the addition of Mo,which indicates that Mo has grain refinement *** correlative analysis gives rise to the conclusion that the coercivity mechanism of the investigated alloys is dominated by pinning *** in all,the enhancement of the magnetic properties is mainly attributed to the synergistic impact of grain refinement,pinning effects and the micro structural *** research may shed light on the potential development and application of rare earth-based counterpart magnets.

关键词： Mo-doped Nd-Ce-Fe-B alloy Magnetic properties Melt-spun ribbons Microstructure Coercivity mechanism

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Irregular distribution of wind power prediction

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Journal of Modern Power Systems and Clean Energy 2018年第6期6卷 1172-1180页

作者： Kun YUAN Kaifeng ZHANG Yaxian zheng Dawei li Ying WANG zhenglin YANG Key Laboratory of Measurement and Control of CSE School of Automation Southeast University China Electric Power Research Institute (Nanjing)

Wind power is volatile and uncertain, which makes it difficult to establish an accurate prediction *** to quantitatively describe the distribution of wind power output is the focus of this paper. First, it is assumed that wind speed is a random variable that satisfies the normal distribution. Secondly, based on the nonlinear relationship between wind speed and wind power, the distribution model of wind power prediction is established from the viewpoint of the physical mechanism. The proposed model successfully shows the complex characteristics of the wind power prediction distribution. The results show that the distribution of wind power prediction varies significantly with the point forecast of the wind speed.

关键词： Wind power prediction Normal distribution Irregular distribution Distribution model

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Detrital Zircon U-Pb Ages and Geochemistry of the Silurian to Permian Sedimentary Rocks in Central Inner Mongolia, China: Implications for Closure of the Paleo-Asian Ocean

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Acta Geologica Sinica(English Edition) 2019年第5期93卷 1228-1260页

作者： li Yilong WANG Guoqing XIAO Wenjiao ZOU Jing zheng Jianping Fraukje MBROUWER School of Earth Sciences State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhan 430074China State Key Laboratory of lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Geology and Geochemistry group Department of Earth SciencesVU AmsterdamDe Boelelaan 10851081 HV AmsterdamThe Netherlands

The Solonker suture zone has long been considered to mark the location of the final disappearance of the PaleoAsian Ocean in the eastern Central Asian Orogenic Belt(CAOB). However, the time of final suturing is still controversial with two main different proposals of late Permian to early Triassic, and late Devonian. This study reports integrated wholerock geochemistry and LA-ICP-MS zircon U-Pb ages of sedimentary rocks from the Silurian Xuniwusu Formation, the Devonian Xilingol Complex and the Permian Zhesi Formation in the Hegenshan-Xilinhot-linxi area in central Inner Mongolia, China. The depositional environment, provenance and tectonic setting of the Silurian-Devonian and the Permian sediments are compared to constrain the tectonic evolution of the Solonker suture zone and its neighboring zones. The protoliths of the silty slates from the Xuniwusu Formation in the Baolidao zone belong to wacke and were derived from felsic igneous rocks with steady-state weathering, poor sorting and compositional immaturity. The protoliths of metasedimentary rocks from the Xilingol Complex were wackes and litharenites and were sourced from predominantly felsic igneous rocks with variable weathering conditions and moderate sorting. The Xuniwusu Formation and Xilingol Complex samples both have two groups of detrital zircon that peak at ca. 0.9-1.0 Ga and ca. 420-440 Ma, with maximum deposition ages of late Silurian and middle Devonian age, respectively. Considering the ca. 484-383 Ma volcanic arc in the Baolidao zone, the Xuxiniwu Formation represents an oceanic trench sediment and is covered by the sedimentary rocks in the Xilingol Complex that represents a continental slope sediment in front of the arc. The middle Permian Zhesi Formation metasandstones were derived from predominantly felsic igneous rocks and are texturally immature with very low degrees of rounding and sorting, indicating short transport and rapid burial. The Zhesi Formation in the Hegenshan zone has a main zirc

关键词： geochemistry zircon LA-ICP-MS U-Pb dating sedimentary rocks Paleo-Asian Ocean Central Asian Orogenic Belt

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Fast Cholesky Factorization Algorithm for s. p. d Block-Toeplitz Matrices

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Wuhan University Journal of Natural Sciences 1999年第3期4卷 285-289页

作者： Zhang li zheng Hui-rao Xie Jin-li Wang Wei Wuhan University College of Mathematical and Computer Sciences Wuhan China (GRID:grid.49470.3e) (ISNI:***)

A fast Cholesky factorization algorithm based on the classical Schur algorithm for themp×mp symmetric positive definite (s. p. d) block-Toeplitz matrices is presented. The relation between the generator and the Schur complement of the matrices is explored. Besides, by applying the hyperbolic Householder transformations, we can reach an improved algorithm whose computational complexity is2p 2m3?4pm3+3/2m3+O(pm).

关键词： hyperbolic Householder transformation generator Schur complement displacement structure

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Pd@Ir-LOD multienzyme utilizing endogenous lactate consumption cooperates with photothermal for tumor therapy

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Nano Research 2024年第1期17卷 270-281页

作者： Zichen Ye Yun li Jingchao li Xinyan Hu Jinyang zheng Gongxin Zhang Sijin Xiang Tianbao Zhu Zhide Guo Xiaolan Chen State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials and Engineering Research Center for Nano-Preparation Technology of Fujian ProvinceCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics&Center for Molecular Imaging and Translational Medicine School of Public Health Xiamen UniversityXiamen 361102China The High Educational Key Laboratory for Biomedical Engineering&Key Laboratory of Fire Retardant Materials of Fujian Province Department of BiomaterialsCollege of MaterialsXiamen UniversityXiamen 361102China

Lactic acid(LA)plays a major role in the occurrence,development,and spread of *** by its high accumulation in tumor site,a novel lactate oxidase(LOD)conjugated two-dimensional Pd@Ir nanoplatform(Pd@Ir-LOD,PIL)was fabricated to combine cascade reaction with photothermal for tumor *** detail,the overexpressed LA in tumor microenvironment(TME)was a key factor to activate the PIL-based cascade reaction:(1)Plenty of H_(2)O_(2)could be generated from LA by the catalysis of LOD with O_(2);(2)potent·OH was produced from H_(2)O_(2)due to the peroxidase(POD)-like activity of PIL;(3)meantime,PIL’s catalase(CAT)-like activity could decompose part H_(2)O_(2)into O_(2)to achieve the purpose of LA cyclic ***,the reduced glutathione(GSH)scavenging capability of PIL might protect the produced reactive oxygen species(ROS)from being cleared to further improve the cascade therapeutic *** importantly,PIL had excellent photothermal conversion efficiency(37.35%)and manifested a surprising temperature rising effect in *** together,the decreasing LA concentration,accumulation of high-toxic ROS,the depletion of GSH together with the higher intra-tumoral temperature potently enhanced in vivo antitumor ***,a promising therapeutic tactic based on PIL integrating endogenous LA consumption,chemodynamic therapy(CDT),and photothermal therapy(PTT)has been put forward.

关键词： lactate oxidase chemodynamic therapy photothermal therapy cascade reaction tumor microenvironment

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Mg,Ti-base surface integrated layer and bulk doping to suppress lattice oxygen evolution of Ni-rich cathode material at a high cut-off voltage

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Journal of Energy Chemistry 2022年第8期31卷 434-444,I0012页

作者： Fan Peng Youqi Chu Yu li Qichang Pan Guangchang Yang lixuan Zhang Sijiang Hu Fenghua zheng Hongqiang Wang Qingyu li Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004GuangxiChina Guangxi New Energy Ship Battery Engineering Technology Research Center Guangxi Normal UniversityGuilin 541004GuangxiChina

The Nickel-rich layered cathode materials charged to 4.5 V can obtain a specific capacity of more than 200 m Ah g^(-1).However,the nickel-rich layered cathode materials suffer from the severe capacity fade during high-voltage cycling,which is related to the phase transformation and the surface sides reactions caused by the lattice oxygen ***,the simultaneous construction of a Mg,Ti-based surface integrated layer and bulk doping through Mg,Ti surface treatment could suppress the lattice oxygen evolution of Nirich material at deep *** importantly,Mg and Ti are co-doped into the particles surface to form an Mg_(2)TiO_(4) and Mg_(0.5–x)Ti_(2–y)(PO_(4))_(3) outer layer with Mg and Ti *** the constructed surface integrated layer,the reverse electric field in the Mg_(2)TiO_(4) effectively suppressed the outward migration of the lattice oxygen anions,while Mg_(0.5–x)Ti_(2–y)(PO_(4))_(3) outer layer with high electronic conductivity and good lithium ion conductor could effectively maintained the stability of the reaction interface during highvoltage ***,bulk Mg and Ti co-doping can mitigate the migration of Ni ions in the bulk to keep the stability of transition metal–oxygen(M-O)bond at deep *** a result,the NCM@MTP cathode shows excellent long cycle stability at high-voltage charging,which keep high capacity retention of 89.3%and 84.3%at 1 C after 200 and 100 cycles under room and elevated temperature of 25 and 55°C,*** work provides new insights for manipulating the surface chemistry of electrode materials to suppress the lattice oxygen evolution at high charging voltage.

关键词： Ni-rich layered oxide Mg Ti-base surface integrated layer Bulk doping Lattice oxygen evolution

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CoMFA Model and Molecular Design of Anti-excitatory Activity for Benzodiazepinooxazole Derivatives against Mice

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Chinese Journal of Structural Chemistry 2021年第8期40卷 1075-1081,971页

作者： ZHU li-Lan QIN zheng-Long FENG Chang-Jun Department of Physical Education Guangdong Industry PolytechnicGuangzhou 510300China College of Chemistry and Materials Science Jiangsu Normal UniversityXuzhou 211116China School of Chemistry&Chemical Engineering Xuzhou University of TechnologyXuzhou 221018China

A 3D-QSAR study was conducted to analyze the anti-excitatory activity(p E)of benzodiazepinooxazole derivatives to mice by the comparative molecular field analysis(CoMFA)*** the 54 active molecules,a training set of 46 compounds was randomly selected to construct the CoMFA model;the remaining compounds,together with template molecule(No.54)and two newly designed molecules constitute a test set of 17 compounds to validate the *** obtained cross-validation coefficient(R_(cv)^(2)),the non-cross validation coefficient(R^(2)),and the test value F of the CoMFA model for training set are 0.516,0.899,and 57.57,*** model was used to predict the activities of all compounds in the training and testing sets,and the results indicated that the model had good correlation,strong stability and good *** on the 3D contour maps,eight novel benzodiazepinooxazole derivatives with higher anti-excitatory activity were ***,the effectiveness of these novel benzodiazepinooxazole derivatives is still needed to be verified by the experimental results.

关键词： benzodiazepinooxazole derivative mice anti-excitatory activity 3D-QSAR comparative molecular field analysis

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Theoretical investigation on the steady-state natural circulation characteristics of a new type of pressurized water reactor

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Nuclear Science and Techniques 2006年第5期17卷 314-320页

作者： GOU Jun-li QIU Sui-zheng SU Guang-Hui JIA Dou-Nan State Key Laboratory of Multiphase Flow in Power Engineering Xi＇an Jiaotong University Xi＇an 710049 China

This article presents a theoretical investigation on the steady-state natural circulation characteristics of a new type of pressurized water reactor. Through numerically solving the one-dimensional steady-state single-phase conservative equations for the primary circuit and the steady-state two-phase drift-flux conservative equations for the secondary side of the steam generator, the natural circulation characteristics were studied. On the basis of the pre- liminary calculation analysis, it was found that natural circulation mass flow rate was proportional to the exponential function of the power and that the value of the exponent is related to the operating conditions of the secondary side of the steam generator. The higher the outlet pressure of the secondary side of the steam generator, the higher the pri- mary natural circulation mass flow rate. The larger height difference between the core center and the steam generator center is favorable for the heat removal capacity of the natural circulation.

关键词：核反应堆压水堆稳态自然循环高度差理论研究

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Characterization of natural organic matter in water for optimizing water treatment and minimizing disinfection by-product formation

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Journal of Environmental Sciences 2016年第4期28卷 1-5页

作者： Qi zheng Xiaoqiu Yang Wenchao Deng X.Chris Le Xing-Fang li Key Laboratory of Optoelectronic Chemical Materials and Devices Ministry of EducationSchool of Chemical and Environmental EngineeringJianghan University Institute of Environment and Health Jianghan University Division of Analytical and Environmental Toxicology University of Alberta

Introduction Natural organic matter（NOM）present in source water has significant impact on water treatment processes and on the quality of drinking *** is a complex mixture of diverse groups of organic compounds,humi... 详细信息

关键词： Disinfection by-products(DBPs) Dissolved organic carbon(DOC) Dissolved organic matter(DOM) Fluorescence Natural organic matter(NOM) Nitrification Size exclusion chromatography Total organic carbon(TOC)

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