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Journal of Energy Chemistry 2024年第4期91卷 609-618页

作者： Zhanglong Yu Xueling Shen Ran Xu Zheng Wang Zengming Wan Mingyang Chen Yi Cui Yanyan Fang Xiaoli Ma China Automotive Battery Research Institute co. Ltd.Beijing 101407China China Grinm Group co. Ltd.Beijing 100088China Ministry of Industry and Information technology Equipment Industry Development CenterBeijing 100846China Hefei Guoxuan High-tech Power energy co. Ltd.Hefei 230000AnhuiChina

In this study,a detailed analysis of the co.bustion behaviors of the lithium iron phosphate(LFP)and lithium manganese oxide(LMO)batteries used in electric bicycles was *** research included quantitative measurements of the co.bustion duration,flame height,co.bustion temperature,heat release rate,and total heat *** results indicated that LMO batteries exhibited higher co.bustion temperatures of 600–700°C,flame heights of 70–75 cm,a significantly higher heat release rate of40.1 k W(12 Ah),and a total heat release of 1.04 MJ(12 Ah)co.pared to LFP batteries with the same *** on these experimental results,a normalized total heat release(NORTHR)parameter was proposed,demonstrating good universality for batteries with different *** this parameter,quantitative calculations and optimization of the extinguishing agent dosage were co.ducted for fires involving these two types of batteries,and the method was validated by extinguishing fires for these two types of battery packs with water-based extinguishing fluids.

关键词： co.bustion behavior Electric bicycle Lithium-ion battery Fire extinguishing Normalized total heat release

Effect of austenitizing co.dition on mechanical properties,microstructure and precipitation behavior of AISI H13 steel

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Journal of Iron and Steel Research International 2024年第1期31卷 143-156页

作者： An-gang Ning Yang Liu Rui Gao Stephen Yue Ming-bo Wang Han-jie Guo co.lege of Materials science and Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina Department of Mining and Materials Engineering McGill UniversityMontrealQCH3A 0C5Canada ASSAB Tooling technology(Chongqing)co. Ltd.Chongqing401120China School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing100083China

The effects of austenitizing temperature(1223,1303,and 1373 K)and holding time(1-1500 s)on the microstructure,mechanical properties,and precipitation behavior of the H13 hot work die steel were *** results indicate a softening phenomenon when H13 steel is austenitized at 1303 K beyond 900 s and 1373 K beyond 600 s,*** the sample held for 1200 s,the tensile strength is found capable of reaching up to 2.2 GPa when quenched from a temperature above 1303 ***,prior-austenite grain size increases with the increase in austenitizing *** kinetic behavior of the precipitates(mainly MC-type carbides)in H13 steel co.ld be elaborated through the principles set forth by the Arrhenius and Avrami ***,the co.prehensive strengthening of the H13 steel was discussed in *** results show that the activation energy of the transformed fraction of carbides is higher than that of the diffusion process for co.mon alloying elements(Cr,V,Mo,and Ni)found in the *** suggests that it would be difficult for precipitates to dissolve into the matrix when H13 steel is austenitized at high *** the increasing austenitizing temperature,the precipitation fraction decreases,and the dislocation density *** dislocation strengthening is regarded as the dominant strengthening co.tributed to yield strength in as-quenched H13 steel.

关键词： H13 steel Austenitizing Mechanical property Precipitation behavior co.prehensive strengthening

Morphological and molecular evidence for natural hybridization between Sorbus pohuashanensis and S. disco.or (Rosaceae)

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Journal of Forestry Research 2024年第4期35卷 189-201页

作者： Yuxia Wu Xuedan Yu Wei Tang Wenhua Yang Qidi Fu Yongqi Zheng Chuanhong Zhang State Key Laboratory of Tree Genetics and Breeding Research Institute of ForestryChinese Academy of ForestryBeijing 100091People’s Republic of China beijing Waiyan Online Digital technology co. LtdBeijing 100081People’s Republic of China Huabanlv Nature Enlightenment Education technology co. LtdBeijing 100010People’s Republic of China

In overlapping distribution areas of Sorbus pohuashanensis and *** in North China(Mount Tuoliang,Mount Xiling and Mount Baihua),Sorbus indi-viduals were found with pink fruit,which have never been reco.ded for the flora of *** morphological characters co.bined with four chloroplast DNA markers and internal transcribed spacer(ITS)were used to analyze the origin of the Sorbus individuals with pink fruits and their relationship to *** and ***,SDA and one-way(taxon)ANOVA of morphological characters provided co.vincing evidence of the hybrid ori-gin of Sorbus individuals with pink fruits based on a novel morphological character and many intermediate *** analysis based on four cpDNA markers showed that either *** or *** were maternal parents of Sorbus individuals with pink ***-ence of the position of Sorbus individuals with pink fruits between cpDNA and ITS in cluster trees supported by DNA sequence co.parative analysis,implying former hybridiza-tion events between *** and ***-tiple hybridization events between *** and *** might have co.tributed to the generation of Sorbus individuals with pink *** study has provided insights into hybridization between species of the same genus in sympatric areas,which is of great significance for the study of interspecific hybridization.

关键词： Hybridization ITS Chloroplast DNA Morphological characters Sorbus

Facile synthesis of co.posite polyferric magnesium-silicate-sulfate co.gulant with enhanced performance in water and wastewater

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 574-584页

作者： Xiangtao Huo Rongxia Chai Lizheng Gou Mei Zhang Min Guo School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China

The co.gulation process is a widely applied technology in water and wastewater *** co.posite polyferric mag-nesium-silicate-sulfate(PFMS)co.gulants were synthesized using Na_(2)SiO_(3)·9H_(2)O,Fe_(2)(SO_(4))_(3),and MgSO_(4) as raw materials in this *** effects of aging time,Fe:Si:Mg,and OH:M molar ratios(M represents the metal ions)on the co.gulation performance of the as-pre-pared PFMS were systematically investigated to obtain optimum *** results showed that PFMS co.gulant exhibited good co.agulation properties in the treatment of simulated humic acid-kaolin surface water and reactive dye *** the molar ratio was co.trolled at Fe:Si:Mg=2:2:1 and OH:M=0.32,the obtained PFMS presented excellent stability and a high co.gulation *** removal efficiency of ultraviolet UV254 was 99.81%,and the residual turbidity of the surface water reached 0.56 NTU at a dosage of 30 mg·L^(-1).After standing the co.gulant for 120 d in the laboratory,the removal efficiency of UV254 and residual turbidity of the surface wa-ter were 88.12%and 0.68 NTU,respectively,which acco.d with the surface water treatment *** addition,the co.gulation performance in the treatment of reactive dye wastewater was greatly improved by co.bining the advantages of magnesium and iron *** with polyferric silicate-sulfate(PFS)and polymagnesium silicate-sulfate(PMS),the PFMS co.gulant played a better deco.or-ization role within the pH range of 7-13.

关键词： polyferric-magnesium-silicate-sulfate co.posite co.gulants water and wastewater excellent stability high co.gulation ef-ficiency deco.orization

Mechanical properties and energy evolutions of burst-prone co.l samples with holes and fillings

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International Journal of co.l science & technology 2024年第3期11卷 176-189页

作者： Yukai Fu Yongzheng Wu Junchen Li Penghe Zhou Zhuoyue Sun Jie He CCTEG co.l Mining Research Institute Beijing100013China co.l Mining and Designing Department Tiandi Science and Technology Co.Ltd.Beijing100013China co.l Mining and Designing Branch China Coal Research InstituteBeijing100013China Resource Engineering Department China University of Mining and TechnologyBeijing100083China

During the mining process of impact-prone co.l seams,drilling pressure relief can reduce the impact propensity of the co.l seam,but it also reduces the integrity and strength of the co.l mass at the side of the ***,studying the mechanical properties and energy evolution rules of co.l samples co.taining holes and filled structures has certain practical significance for achieving co.rdinated co.trol of co.l mine rockburst disasters and the stability of roadway surrounding *** achieve this aim,seven types of burst-prone co.l samples were prepared and subject to uniaxial co.pression experiments with the aid of a TAW-3000 electro-hydraulic servo testing ***,the stress–strain curves,aco.stic emission signals,DIC strain fields and other data were co.lected during the ***,the failure modes and energy evolutions of samples with varying drilled hole sizes and filling materials were *** results show that the indexes related to burst propensity of the drilled co.l samples decline to some extent co.pared with those of the intact one,and the decline is positively co.elated to the diameter of the drilled *** hole filling,the strain co.centration degree around the drilled hole is lowered to a certain degree,and polyurethane filling has a more remarkable effect than cement ***,hole filling can enhance the strength and deformation resistance of *** drilling can accelerate the release of accumulated elastic strain energy,turning the aco.stic emission events from low-frequency and high-energy ones to high-frequency and low-energy ones,whereas hole filling can reduce the intensity of energy *** experimental results and theoretical derivation demonstrate that hole filling promotes co.l deformability and strength mainly by weakening stress co.centration surrounding the drilled ***,the fillings can achieve a better filling effect if their elastic modulus and Poisson’s ratio are closer

关键词： Rock mechanics co.l Mechanical properties Hole filling Energy evolution

Underdetermined direction of arrival estimation with nonuniform linear motion sampling based on a small unmanned aerial vehicle platform

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Defence technology（防务技术） 2024年第3期33卷 352-363页

作者： Xinwei Wang Xiaopeng Yan Tai An Qile Chen Dingkun Huang science and technology on Electromechanical Dynamic co.trol Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China

Uniform linear array(ULA)radars are widely used in the co.lision-avoidance radar systems of small unmanned aerial vehicles(UAVs).In practice,a ULA's multi-target direction of arrival(DOA)estimation performance suffers from significant performance degradation owing to the limited number of physical *** improve the underdetermined DOA estimation performance of a ULA radar mounted on a small UAV platform,we propose a nonuniform linear motion sampling underdetermined DOA estimation *** the motion of the UAV platform,the echo signal is sampled at different ***,acco.ding to the co.cept of difference co.array,a virtual ULA with multiple array elements and a large aperture is synthesized to increase the degrees of freedom(DOFs).Through position analysis of the original and motion arrays,we propose a nonuniform linear motion sampling method based on ULA for determining the optimal *** the co.dition of no increase in the aperture of the physical array,the proposed method obtains a high DOF with fewer sampling runs and greatly improves the underdetermined DOA estimation performance of *** results of numerical simulations co.ducted herein verify the superior performance of the proposed method.

关键词： Unmanned aerial vehicle(UAV) Uniform linear array(ULA) Direction of arrival(DOA) Difference co.array Nonuniform linear motion sampling method

Relationship between the unique microstructures and behaviors of high-entropy alloys

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1350-1363页

作者： Yaqi Wu Peter KLiaw Ruixuan Li Weiran Zhang Guihong Geng Xuehui Yan Guiqun Liu Yong Zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Department of Materials science and Engineering The University of TennesseeKnoxvilleTN 37996USA Xi’an Rare Metal Materials Institute co.Ltd. Xi’an 710016China School of Materials science and Engineering North Minzu UniversityYinchuan 750030China GRIMAT Engineering Institute co. Ltd.Beijing 101407China

High-entropy alloys(HEAs),which were introduced as a pioneering co.cept in 2004,have captured the keen interest of nu-merous ***,in this co.text,can be perceived as representing disorder and *** co.trast,elemental co.posi-tions within alloy systems occupy specific structural sites in space,a co.cept referred to as *** acco.dance with Shannon entropy,structure is analogous to ***,the arrangement of atoms within a material,termed its structure,plays a pivotal role in dictating its *** addition to expanding the array of options for alloy co.posites,HEAs afford ample opportunities for diverse structural *** profound influence of distinct structural features on the exceptional behaviors of alloys is undersco.ed by numer-ous *** features include remarkably high fracture strength with excellent ductility,antiballistic capability,exceptional radi-ation resistance,and co.rosion *** this paper,we delve into various unique material structures and properties while elucidating the intricate relationship between structure and performance.

关键词： high-entropy alloys unique microstructure special properties alloy design

Disparity estimation for multi-scale multi-sensor fusion

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Journal of Systems Engineering and Electronics 2024年第2期35卷 259-274页

作者： SUN Guoliang PEI Shanshan LONG Qian ZHENG Sifa YANG Rui Suzhou Automotive Research Institute Tsinghua UniversitySuzhou 215000China beijing Smarter Eye technology co. Ltd.Beijing 100023China co.lege of Artifical Intelligence Tianjin University of Science and TechnologyTianjin 300457China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China Department of Precision Instrument Tsinghua UniversityBeijing 100084China

The perception module of advanced driver assistance systems plays a vital *** schemes often use a single sensor for data processing and environmental perception or adopt the information processing results of various sensors for the fusion of the detection *** paper proposes a multi-scale and multi-sensor data fusion strategy in the front end of perception and acco.plishes a multi-sensor function disparity map generation scheme.A binocular stereo vision sensor co.posed of two cameras and a light deterction and ranging(LiDAR)sensor is used to jointly perceive the environment,and a multi-scale fusion scheme is employed to improve the accuracy of the disparity *** solution not only has the advantages of dense perception of binocular stereo vision sensors but also co.siders the perception accuracy of LiDAR *** demonstrate that the multi-scale multi-sensor scheme proposed in this paper significantly improves disparity map estimation.

关键词： stereo vision light deterction and ranging(LiDAR) multi-sensor fusion multi-scale fusion disparity map

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 co.lege of Materials science and Engineering Kunming University of Science and TechnologyKunming 650093China co.lege 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 co.tents(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 co.ponents were deformation texture(A*,co.per 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 co.tent,and the textures transformed into recrystallized textures(Cube,A and Goss texture).Tensile testing revealed that the designed T6 alloys with 2.0%Cu co.tent 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 acco.modation capacity caused by heat treatment.

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

The difference of the ionomer–catalyst interfaces for poly(aryl piperidinium)hydroxide exchange membrane fuel cells and proton exchange membrane fuel cells

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Nano Research 2024年第7期17卷 6102-6110页

作者： Xuerui Liu Xingdong Wang Chanyu Zhang Yun Cai Bowen Chen Dongyue Xin Xiaoxiao Jin Wei Zhu Klaus Wippermann Hui Li Ruiyu Li Zhongbin Zhuang beijing Advanced Innovation Center for Soft Matter science and Engineering Beijing University of Chemical TechnologyBeijing 100029China State Key Lab of Organic-Inorganic co.posites Beijing University of Chemical TechnologyBeijing 100029China Research Institute of Petroleum Processing SINOPECBeijing 100083China DeepHytec co. Ltd.Shenzhen 518118China Institute of Energy and Climate Research(IEK-14) Forschungszentrum Jülich GmbHJülich 52425Germany beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical TechnologyBeijing 100029China

The microstructures of the ionomer–catalyst interfaces in the catalyst layers are important for the fuel cell performance because they determine the distribution of the active triple-phase ***,we investigate the ionomer–catalyst interactions in hydroxide exchange membrane fuel cells(HEMFCs)using poly(aryl piperidinium)and co.pare them with proton exchange membrane fuel cells(PEMFCs).It is found that different catalyst layer microstructures are between the two types of fuel *** ionomer/carbon(I/C)ratio does not have a remarkable impact on the HEMFC performance,while it has a strong impact on the PEMFC performance,indicating the weaker interaction between the HEMFC ionomer and *** dynamics simulations demonstrate that the HEMFC ionomer tends to distribute on the carbon support,unlike the PEMFC ionomer,which heavily co.ers the Pt *** results suggest that the poisoning effect of the ionomer on the catalyst is much weaker in HEMFCs,and the improved ionomer/catalyst interaction is beneficial for the HEMFC performances.

关键词： hydroxide exchange membrane fuel cells catalysts ionomer oxygen reduction reaction interfaces