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Journal of Materiomics 2023年第3期9卷 464-471页

作者： Shuai Cheng Boping Zhang shengjie ai Hongbao Yu Xin Wang Jiahao Yang Changrong Zhou Jingtai Zhao Guanghui Rao Guangxi Key Laboratory of Information Materials&School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin541004China Foshan(Southern China)Institute for New Materials Foshan528200GuangdongChina School of Materials Science and Engineering Shanghai UniversityShanghai200444China School of Materials Science and Engineering University of Science and Technology Beijing100083BeijingChina

Morphotropic phase boundary(MPB)plays a key role in tuning piezoelectric responses of ferroelectric ***,Bi_(0.5)Na_(0.5)TiO_(3)modified BiFeO_(3)-BaTiO_(3)ternary solid solutions of 0.7BiFeO_(3)-(0.3-x)BaTiO_(3)-xBi_(0.5)Na_(0.5)TiO_(3)(referred to as BF-BT-xBNT,0.00≤x≤0.04)were prepared for lead-free *** the ceramics exhibit an MPB with coexisting rhombohedral(R)and tetragonal(T)phases,and the R/T phase ratio decreases upon increasing *** increment of BNT promotes the grain growth,lowers the leakage current and Curie temperature(TC),and gradually drives the ferroelectric to relaxor *** of the MPB with appropriate R/T phase ratio,increased grain size and density,and decreased leakage current,the well-balanced performance between d_(33)=206 pC/N and TC=488℃is obtained in x=0.01 *** addition,the further enhanced in-situ d_(33)=286e347 pC/N is obtained in BF-BT-xBNT ceramics along with the improved depolarization temperature T_(d)from 280 to 312℃,showing a potential application for lead-free piezoceramics at high temperature.

关键词： Ferroelectrics Piezoelectric property Curie temperature Phase transitions Thermal stability

Leaching kinetics of fluorine during the aluminum removal from spent Li-ion battery cathode materials

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Journal of Environmental Sciences 2024年第4期138卷 312-325页

作者： shengjie Li Jianxin Zhu Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

The high content of aluminum(Al)impurity in the recycled cathode powder seriously affects the extraction efficiency of Nickel,Cobalt,Manganese,and Lithium resources and the actual commercial value of recycled materials,so Al removal is crucially important to conform to the industrial standard of spent Li-ion battery cathode *** this work,we systematically investigated the leaching process and optimum conditions associated with Al removal from the cathode powder materials collected in a wet cathode-powder peeling and recycling production line of spent Li-ion batteries(LIBs).Moreover,we specifically studied the leaching of fluorine(F)synergistically happened along with the removal process of Al,which was not concerned about in other studies,but one of the key factors affecting pollution prevention in the recovery *** mechanism of the whole process including the leaching of Al and F from the cathode powder was indicated by using NMR,FTIR,and XPS,and a defluoridation process was preliminarily investigated in this *** leaching kinetics of Al could be successfully described by the shrinking core model,controlled by the diffusion process and the activation energy was 11.14 kJ/***,the leaching of F was attributed to the dissolution of LiPF6and decomposition of PVDF,and the kinetics associated was described by Avrami *** interaction of Al and F is advantageous to realize the defluoridation to some *** is expected that our investigation will provide theoretical support for the large-scale recycling of spent LIBs.

关键词： Al removal F leaching Cathode powder Heating alkali leaching Leaching kinetics

Effect of Calcination Temperature on the Microstructure and Surface Properties of a Cu/ZnO Catalyst Derived from Zn_(3)Cu_(2)(OH)_(6)(CO_(3))_(2)

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China Petroleum Processing & Petrochemical Technology 2024年第2期26卷 46-56页

作者： Qiu Shiming Wang shengjie School of Chemistry and Chemical Engineering Guangxi Minzu Normal UniversityChongzuo 532200GuangxiChina Guangxi Key Laboratory for High-value Utilization of Manganese Resources Chongzuo 532200GuangxiChina

The Cu/ZnO catalyst formed upon the calcination of aurichalcite has a uniform distribution of ZnO,which can delay the sintering of Cu species at high *** this study,aurichalcite possessing a nearly pure phase was prepared using the ammonium complex dissociation precipitation method,and the effect of calcination temperature on the structure and surface properties of the derived Cu/ZnO catalyst was *** results show that the calcination temperature determines the particle size and crystallization degree of the Cu/ZnO catalyst and the surface properties of the corresponding copper oxide and reduced ***-temperature calcination is more conducive to reducing the particle size of the Cu/ZnO catalyst,increasing the specific surface area,and generating abundant defect characteristics on the surface,which is key to obtaining highly dispersed copper and copper-specific surface area catalysts by subsequent ***,the Cu/ZnO catalyst derived using a 300℃or 400℃calcination proved to have a higher specific activity per gram of copper than a commercial Cu/Zn/Al *** discovery in this study opens up a new method for the convenient preparation of a high-temperature resistant Cu/Zn methanol reforming catalyst.

关键词： methanol reforming copper zinc oxide lattice defect

Heterometallic Mg-Ni-Mg Complex Promoted Hydrosilylation of Alkenes: Catalytic Performance and Intermediates Characterization

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Chinese Journal of Chemistry 2024年第18期42卷 2133-2139页

作者： Yanping Cai shengjie Jiang Xin Xu Key Laboratory of Organic Synthesis of Jiangsu Province College of ChemistryChemical Engineering and Materials ScienceSoochowUniversitySuzhouJiangsu215123China

Background and Originality Content The catalytic hydrosilylation of unsaturated hydrocarbons,facilitated by transition metal(TM),is widely recognized as a proficient technique for the synthesis of high-value organosilicon compounds'ti-4l over the past few decades,the most dominant *** in hydrosilylation processes have been constituted by pre-Ccious metar complexesroceinerecent vears omore sustainabile earth-abundant metal catalysts have received increased attentionj2-14l The classcal mechanism of transition metal-catalyzed hydrosilylation is generally accomplished through a series of fundamental processes(Scheme 1a),including(i)coordination and oxidative addition of Si-H bond to a low-valent metal center to form e.g.,o-complex or silyl metal hydride;(ii)insertion of.C-C multipe bonds intometal-hdridelsior metal-silicon bond;jiol and(ii)reductive elimination that forwards the hydrosilylated product with Markovnikov or anti-Markovnikov selectivity.

关键词： Heterometallic complex Cooperative effect Hydrosilylation Magnesium Nickel hydride

Multiple Targets Localization Algorithm Based on Covariance Matrix Sparse Representation and Bayesian Learning

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Journal of Beijing Institute of Technology 2024年第2期33卷 119-129页

作者： Jichuan Liu Xiangzhi Meng shengjie Wang School of Electronic Engineering Xidian UniversityXi’an 710071China Hebei Key Laboratory of Electromagnetic Spectrum Cognition and Control Shijiazhuang 050081China

The multi-source passive localization problem is a problem of great interest in signal pro-cessing with many *** this paper,a sparse representation model based on covariance matrix is constructed for the long-range localization scenario,and a sparse Bayesian learning algo-rithm based on Laplace prior of signal covariance is developed for the base mismatch problem caused by target deviation from the initial point *** adaptive grid sparse Bayesian learning targets localization(AGSBL)algorithm is *** AGSBL algorithm implements a covari-ance-based sparse signal reconstruction and grid adaptive localization dictionary ***-tion results show that the AGSBL algorithm outperforms the traditional compressed-aware localiza-tion algorithm for different signal-to-noise ratios and different number of targets in long-range scenes.

关键词： grid adaptive model Bayesian learning multi-source localization

Design of a Bio-inspired,Two-winged,Flapping-wing Micro air Vehicle with High-lift Performance

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Journal of Bionic Engineering 2024年第3期21卷 1191-1207页

作者： Kai Hu Huichao Deng shengjie Xiao Gongyu Yang Yuhong Sun Space Robot Laboratory The School of Mechanical EngineeringBeihang UniversityBeijing100191China

In this paper,we present the development of our latest flapping-wing micro air vehicle(FW-MAV),named Explobird,which features two wings with a wingspan of 195 mm and weighs a mere 25.2 g,enabling it to accomplish vertical take-off and hover *** devised a novel gear-based mechanism for the flapping system to achieve high lift capability and reliability and conducted extensive testing and analysis on the wings to optimise power matching and lift *** Explobird can deliver a peak lift-to-weight ratio of 1.472 and an endurance time of 259 s during hover flight powered by a single-cell LiPo *** the inherent instability of the prototype,we discuss the derivatives of its longitudinal system,underscoring the importance of feedback control,position of the centre of gravity,and increased *** demonstrate the effect of damping enhancement on stability,we also designed a passive stable ***,the vehicle is actively stabilised in roll by adjusting the wing root bars and in pitch through high-authority tail control,whereas yaw is passively *** a series of flight tests,we successfully demonstrate that our prototype can perform vertical take-off and hover flight under wireless *** promising results position the Explobird as a robust vehicle with high lift capability,paving the way towards the use of FW-MAVs for carrying load equipment in multiple tasks.

关键词： Flapping wing Biologically inspired robots Mechanical design Flight dynamics Damping enhancement

Microstructure Characteristics,Texture Evolution and Mechanical Properties of Al-Mg-Si-Mn-xCu Alloys via Extrusion and Heat Treatment

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Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1501-1522页

作者： Zulai Li Yingxing Zhang Junlei Zhang Xiang Chen Suokun Chen Lujian Cui shengjie Han College of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China College of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China National and Local Joint Engineering Laboratory of Advanced Metal Solidification Forming and Equipment Technology Kunming University of Science and TechnologyKunming 650093China Chinalco International Al Application Engineering Co. Ltd.Beijing 100089China

In this work,the impact of extrusion and post-extrusion heat treatment(T6)on the microstructure and mechanical properties of the Al-1.2Mg-0.8Si-0.5Mn alloy with different Cu contents(0,0.6,1.3 and 2.0 wt%)was *** characterization showed that all extruded alloys exhibited elongated grain structure with an average grain size of~4.8μ*** dominant texture components were deformation texture(A*,Copper and P texture),while the proportion of random texture initially increased and then decreased with increasing Cu *** T6 treatment,the grain size of the four alloys increased significantly,but the growth trend decreased with increasing Cu content,and the textures transformed into recrystallized textures(Cube,A and Goss texture).Tensile testing revealed that the designed T6 alloys with 2.0%Cu content exhibited an excellent strength-ductility balance,i.e.,a yield strength of 342.9 MPa,an ultimate tensile strength of 424.8 MPa and an elongation of 15.9%.The enhanced strength was mainly attributed to fine grain strengthening,solid solution strengthening and aging strengthening *** superior ductility was due to the pinning effect of fine precipitates and high dislocation accommodation capacity caused by heat treatment.

关键词： Al-Mg-Si-Mn alloy Cu addition Microstructure texture Mechanical Properties

Linkage between precipitation isotopes and water vapor sources in the monsoon margin:Evidence from arid areas of Northwest China

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Journal of Arid Land 2024年第3期16卷 355-372页

作者： CHEN Fenli ZHANG Qiuyan WANG shengjie CHEN Jufan GAO Minyan Mohd Aadil BHAT College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730000China Key Laboratory of Resource Environment and Sustainable Development of Oasis of Gansu Province Northwest Normal UniversityLanzhou 730000China School of Ocean and Earth Science Tongji UniversityShanghai 200092China

The isotope composition in precipitation has been widely considered as a tracer of monsoon *** with the coastal region,the monsoon margin usually has limited precipitation with large fluctuation and is usually sensitive to climate *** water resource management in the monsoon margin should be better planned by understanding the composition of precipitation isotope and its influencing *** this study,the precipitation samples were collected at five sampling sites(Baiyin City,Kongtong District,Maqu County,Wudu District,and Yinchuan City)of the monsoon margin in the northwest of China in 2022 to analyze the characteristics of stable hydrogen(δD)and oxygen(δ18O)*** analyzed the impact of meteorological factors(temperature,precipitation,and relative humidity)on the composition of precipitation isotope at daily level by regression analysis,utilized the Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT)-based backward trajectory model to simulate the air mass trajectory of precipitation events,and adopted the potential source contribution function(PSCF)and concentration weighted trajectory(CWT)to analyze the water vapor *** results showed that compared with the global meteoric water line(GMWL),the slope of the local meteoric water line(LMWL;δD=7.34δ^(18)O-1.16)was lower,indicating the existence of strong regional evaporation in the study *** significantly contributed toδ18O value,while relative humidity had a significant negative effect onδ18O *** the backward trajectory analysis,we found eight primary locations that were responsible for the water vapor sources of precipitation in the study area,of which moisture from the Indian Ocean to South China Sea(ITSC)and the western continental(CW)had the greatest influence on precipitation in the study *** hydrogen and oxygen isotopes in precipitation are significantly influenced by the sources and transportation paths of air *** addition,the r

关键词： water vapor monsoon margin stable water isotope transport trajectory air mass d-excess δ18O δD

MCP-1 and IL-4 encapsulated hydrogel particles with macrophages enrichment and polarization capabilities for systemic lupus erythematosus treatment

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Nano Research 2024年第9期17卷 8316-8324页

作者： shengjie Zhu Danqing Huang Qichen Luan Yang Li Jingjing Gan Yuanjin Zhao Lingyun Sun Department of Rheumatology and Immunology Nanjing Drum Tower HospitalClinical Medical College of Traditional Chinese and Western MedicineNanjing University of Chinese MedicineNanjing 210096China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China

Macrophages play a pivotal role in systemic lupus erythematosus(SLE)*** have been made to develop multifunctional drug delivery systems capable of directing macrophage ***,we present a novel hyaluronic acid methacrylate(HAMA)hydrogel microparticle encapsulating multiple cytokines for SLE remission though enhancing macrophage *** HAMA microparticles loaded with monocyte chemotactic protein-1(MCP-1)and interleukin-4(IL-4)were fabricated by using a microfluidic *** released MCP-1 facilitates the aggregation of inflammatory macrophages,after which IL-4 induces the macrophage phenotype shift from inflammatory M1 to immune-protective M2,thus restoring immune *** have demonstrated in MRL/lpr mice that the hydrogel microparticles could improve their efficacy of intraperitoneal drug delivery,modulate immune function,and attenuate the disease *** results suggest that our proposed microparticles delivery platform has potential clinical value for treating autoimmune diseases.

关键词： microfluidics M2 polarization hydrogel drug delivery systemic lupus erythematosus(SLE)

Research on the variation of dielectric properties of oil-paper insulation for power equipment over a wide temperature range

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High Voltage 2024年第3期9卷 648-658页

作者： Mingze Zhang Muhe Yu Wen Zhou Yilin Liang shengjie Lei Yunbo Shi Limin Qu Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and TechnologyHarbinChina School of Measurement and Communication Engineering Harbin University of Science and TechnologyHarbinChina Electric Power Research Institute State Grid Heilongjiang Electric Power Company LimitedHarbinChina

The main part of oil-immersed power equipment is oil-paper *** lower ambient temperatures,transformer oil will become *** a result,compared to those at room temperature or operating temperature,the frequency domain dielectric properties of oil-paper insulation at low temperatures are drastically *** evaluating the insulation condition of electrical equipment,it is essential to accurately determine their dielectric *** paper described the FDS test,the DC conductivity test,and the transformer oil viscosity test,which was carried out in a laboratory environment for different ageing of oil-immersed pressboard and transformer oil at 233–373 *** ef-fects of temperature on the dielectric properties at the competing mechanisms of polarisation and conductivity loss were clarified based on variations of the FDS *** the viscosity change of ageing transformer oil at low temperatures,the Arrhenius and VFT viscosity equations were used to achieve a fitting calculation in the different temperature *** on the molecular/ion transition model in the force field and electric field,the characterisation relationships between the dynamic viscosity,DC conductivity,and test temperature of transformer oil were *** limita-tions of conventional transformer oil equivalent dielectric relaxation models over a wide temperature range were finally clarified by combining the test findings of the DC con-ductivity over a wide temperature range with observed and simulated *** paper provides an essential theoretical reference when using the FDS test to diagnose the insulation performance of oil-immersed power equipment in extremely cold regions.

关键词： insulation viscosity immersed