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TA15/TaZrNb multi-element alloy prepared via diffusion bonding:Tensile-strength model and performance of a representative volume element embedded with a sphere 认领 引用
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作者 Wei Chen Fenglei Huang +4 位作者 Chuanting Wang Ruijun Fan Pengjie Zhang Lida Che Aiguo Pi 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2025年第8期36-51,共16页
In this study, to meet the development and application requirements for high-strength and hightoughness energetic structural materials, a representative volume element of a TA15 matrix embedded with a TaZrNb sphere wa... In this study, to meet the development and application requirements for high-strength and hightoughness energetic structural materials, a representative volume element of a TA15 matrix embedded with a TaZrNb sphere was designed and fabricated via diffusion bonding. The mechanisms of the microstructural evolution of the TaZrNb/TA15 interface were investigated via SEM, EBSD, EDS, and XRD.Interface mechanical property tests and in-situ tensile tests were conducted on the sphere-containing structure, and an equivalent tensile-strength model was established for the structure. The results revealed that the TA15 titanium alloy and joint had high density and no pores or cracks. The thickness of the planar joint was approximately 50-60 μm. The average tensile and shear strengths were 767 MPa and 608 MPa, respectively. The thickness of the spherical joint was approximately 60 μm. The Zr and Nb elements in the joint diffused uniformly and formed strong bonds with Ti without forming intermetallic compounds. The interface exhibited submicron grain refinement and a concave-convex interlocking structure. The tensile fracture surface primarily exhibited intergranular fracture combined with some transgranular fracture, which constituted a quasi-brittle fracture mode. The shear fracture surface exhibited brittle fracture with regular arrangements of furrows. Internal fracture occurred along the spherical interface, as revealed by advanced in-situ X-ray microcomputed tomography. The experimental results agreed well with the theoretical predictions, indicating that the high-strength interface contributes to the overall strength and toughness of the sphere-containing structure. 展开更多
关键词 Diffusion bonding Multi-element alloy Joint microstructure In-situ mechanical test X-ray mCT Sphere-containing structure
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Optimization of multi-element airfoil settings considering ice accretion effect 认领 引用 被引量：7
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作者 Jinzhao DAI Haoran LI +1 位作者 Yufei ZHANG Haixin CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第2期41-57,共17页
Almost half of all flight accidents caused by inflight icing occur at the approach and landing phases when high-lift devices are deployed.The present study focuses on the optimization of an ice-tolerant multi-element ... Almost half of all flight accidents caused by inflight icing occur at the approach and landing phases when high-lift devices are deployed.The present study focuses on the optimization of an ice-tolerant multi-element airfoil.Dual-objective optimization is carried out with critical hornshaped ice accumulated during the holding phase.The optimization results show that the present optimization method significantly enhances the iced-state and clean-state performance.The optimal multi-element airfoil has a larger deflection angle and wider gap at the slat and the flap compared with the baseline configuration.The sensitivity of each design parameter is analyzed,which verifies the robustness of the design.The design is further assessed when ice is accreted during the approach and landing phases,which also shows performance improvement. 展开更多
关键词 Aircraft icing Airliner Ice-tolerant airfoil Multi-element airfoil Optimization design
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Geographical origin identification of winter jujube(Ziziphus jujuba Dongzao')by using multi-element fingerprinting with chemometrics 认领 引用 被引量：2
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作者 Xiabing Kong Qiusheng Chen +8 位作者 Min Xu Yihui Liu Xiaoming Li Lingxi Han Qiang Zhang Haoliang Wan Lu Liu Xubo Zhao Jiyun Nie 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2024年第5期1749-1762,共14页
Winter jujube(Ziziphus jujuba'Dongzao')is greatly appreciated by consumers for its excellent quality,but brand infringement frequently occurs in the market.Here,we first determined a total of 38 elements in 16... Winter jujube(Ziziphus jujuba'Dongzao')is greatly appreciated by consumers for its excellent quality,but brand infringement frequently occurs in the market.Here,we first determined a total of 38 elements in 167 winter jujube samples from the main winter jujube producing areas of China by inductively coupled plasma mass spectrometer(ICP-MS).As a result,16 elements(Mg,K,Mn,Cu,Zn,Mo,Ba,Be,As,Se,Cd,Sb,Ce,Er,Tl,and Pb)exhibited significant differences in samples from different producing areas.Supervised linear discriminant analysis(LDA)and orthogonal projection to latent structures discriminant analysis(OPLS-DA)showed better performance in identifying the origin of samples than unsupervised principal component analysis(PCA).LDA and OPLS-DA had a mean identification accuracy of 87.84 and 94.64%in the testing set,respectively.By using the multilayer perceptron(MLP)and C5.0,the prediction accuracy of the models could reach 96.36 and 91.06%,respectively.Based on the above four chemometric methods,Cd,Tl,Mo and Se were selected as the main variables and principal markers for the origin identification of winter jujube.Overall,this study demonstrates that it is practical and precise to identify the origin of winter jujube through multi-element fingerprint analysis with chemometrics,and may also provide reference for establishing the origin traceability system of other fruits. 展开更多
关键词 winter jujube multi-element fingerprint analysis chemometrics origin traceability
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Effect of Al and Sc on deformation behavior of FeCoNi multi-element alloys 认领 引用 被引量：1
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作者 Rui ZHOU Mou LI +4 位作者 Jing-wen QIU Si-hui OUYANG Di PAN Cheng-shang ZHOU Yong LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第10期2109-2116,共8页
The effects of Al and Sc on mechanical properties of FeCoNi multi-element alloys(MEAs) were investigated by compressive tests. The microstructures of FeCoNi MEAs with different contents of Al and Sc were characterized... The effects of Al and Sc on mechanical properties of FeCoNi multi-element alloys(MEAs) were investigated by compressive tests. The microstructures of FeCoNi MEAs with different contents of Al and Sc were characterized and the strengthening mechanisms were discussed. The results show that FeCoNi MEA with a low content of Al has a face-centered cubic(FCC) structure. The yield strength increases linearly with the increase of Al content, which is largely caused by solid solution hardening. Further addition of Sc can promote the formation of a new phase in(FeCoNi)1-xAlx MEAs. A minor addition of Sc can significantly increase the yield strengths of(FeCoNi)1-xAlx MEAs with a low Al content and improve the compressive plasticity of(FeCoNi)1-xAlx MEAs with a high Al content. 展开更多
关键词 FeCoNi multi-element alloys mechanical properties microstructure strengthening mechanism
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A DDoS Attack Information Fusion Method Based on CNN for Multi-Element Data 认领 引用 被引量：1
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作者 Jieren Cheng Canting Cai +3 位作者 Xiangyan Tang Victor SSheng Wei Guo Mengyang Li 《Computers, Materials & Continua》 SCIE EI 2020年第4期131-150,共20页
Traditional distributed denial of service(DDoS)detection methods need a lot of computing resource,and many of them which are based on single element have high missing rate and false alarm rate.In order to solve the pr... Traditional distributed denial of service(DDoS)detection methods need a lot of computing resource,and many of them which are based on single element have high missing rate and false alarm rate.In order to solve the problems,this paper proposes a DDoS attack information fusion method based on CNN for multi-element data.Firstly,according to the distribution,concentration and high traffic abruptness of DDoS attacks,this paper defines six features which are respectively obtained from the elements of source IP address,destination IP address,source port,destination port,packet size and the number of IP packets.Then,we propose feature weight calculation algorithm based on principal component analysis to measure the importance of different features in different network environment.The algorithm of weighted multi-element feature fusion proposed in this paper is used to fuse different features,and obtain multi-element fusion feature(MEFF)value.Finally,the DDoS attack information fusion classification model is established by using convolutional neural network and support vector machine respectively based on the MEFF time series.Experimental results show that the information fusion method proposed can effectively fuse multi-element data,reduce the missing rate and total error rate,memory resource consumption,running time,and improve the detection rate. 展开更多
关键词 DDoS attack multi-element data information fusion principal component analysis CNN
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Enhanced visible-light photocatalytic activity of multi-elements-doped ZrO_2 for degradation of indigo carmine 认领 引用 被引量：3
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作者 E.S.Agorku A.T.Kuvarega +2 位作者 B.B.Mamba A.C.Pandey A.K.Mishra 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第5期498-506,共9页
In this study, C,N,S-doped ZrO2 and a series of Eu doped C,N,S-ZrO2 photocatalysts were synthesized by a coprecipitation method using thiourea as the source of C, N and S and Eu（NO3）·6H2O as source of Eu. The m... In this study, C,N,S-doped ZrO2 and a series of Eu doped C,N,S-ZrO2 photocatalysts were synthesized by a coprecipitation method using thiourea as the source of C, N and S and Eu（NO3）·6H2O as source of Eu. The materials were characterized by X-ray dif-fraction （XRD）, Raman spectroscopy, Fourier transform infrared spectroscopy （FTIR）, UV-visible diffuse reflectance spectroscopy, scanning electron microscopy （SEM）/energy dispersive X-ray spectroscopy （EDX）, and transmission electron microscopy （TEM）. Indigo carmine （IC） was chosen as a model for organic pollutants and used to evaluate the photocatalytic performance of the photo-catalysts under simulated solar light. Commercial ZrO2 was used as a reference material. XRD and Raman results indicated the for-mation of both tetragonal and monoclinic phase ZrO2 with particle size ranging from 8–30 nm. Multi-element doping had a great in-fluence on the optical responses manifested as red shift in the absorption edge. The highest photocatalytic activity towards IC was observed for the Eu,C,N,S-doped ZrO2 （0.6 mol.%Eu） sample （k=1.09×10–2 min–1）. The commercial ZrO2 showed the lowest photo-degradation activity （k=5.83×10–4 min–1）. The results showed that the control of Eu doping in the C,N,S-ZrO2 was very important in reducing electron-hole recombination. The synergistic effect of Eu, C, N, and S in the ZrO2 matrix led to enhanced utilization of simulated solar energy for the degradation of IC through narrowing of bandgaps. 展开更多
关键词 photocatalysis indigo carmine multi-elements-doped ZrO2 rare earths
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Cooperative effects of Mo,V and Zr additions on the microstructure and properties of multi-elemental Nb-Si based alloys 认领 引用 被引量：4
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作者 Rui Ma Xiping Guo 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第1期27-41,共15页
Eight multi-elemental Nb-Si-based alloys with various Mo,V and Zr contents were prepared by vacuum non-consumable arc melting.The cooperative alloying effects of Mo,V and Zr on the arc-melted and heat-treated microstr... Eight multi-elemental Nb-Si-based alloys with various Mo,V and Zr contents were prepared by vacuum non-consumable arc melting.The cooperative alloying effects of Mo,V and Zr on the arc-melted and heat-treated microstructure,mechanical properties as well as oxidation resistance at 1250°C of the alloys were evaluated systematically.The results show that except for adding Mo solely,additions of Mo,V and Zr change the microstructure from eutectic to hypereutectic.The additions of Mo,V and Zr suppress the formation ofα(Nb,X)5 Si 3(“X”represents the alloying elements that substitute for Nb in the lattices),whilst promoting the formation ofγ(Nb,X)5 Si 3.The heat treatment at 1450°C for 50 h promotes the formation of(Nb,X)3 Si phase in the Zr-containing alloys.Alloying with either Mo or Zr improves,and their composite additions more obviously improve the compressive yield strength at 1250°C as well as the microhardness ofγ(Nb,X)5 Si 3.The room temperature fracture toughness of the alloys is enhanced by sole and composite additions of V and Zr,while it is deteriorated by the addition of Mo.The sole addition of Mo,V or Zr improves the oxidation resistance at 1250°C,the composite additions of V with Mo/Zr(especially V-Mo-Zr)degrade the oxidation resistance at 1250°C. 展开更多
关键词 Multi-elemental Nb-Si based ultrahigh temperature alloy Alloying effect Microhardness Room temperature fracture toughness High-temperature compressive yield strength Oxidation resistance
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N-S EQUATION CALCULATIONS ON MULTI-ELEMENT AIRFOILS WITH ZONAL PATCHED GRIDS 认领 引用 被引量：3
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作者 郭同庆 陆志良 《Transactions of Nanjing University of Aeronautics and Astronautics》 2003年第2期155-158,共4页
For a complex flow about multi-element airfoils a mixed grid method is set up. C-type grids are produced on each element′s body and in their wakes at first, O-type grids are given in the outmost area, and H-type grid... For a complex flow about multi-element airfoils a mixed grid method is set up. C-type grids are produced on each element′s body and in their wakes at first, O-type grids are given in the outmost area, and H-type grids are used in middle additional areas. An algebra method is used to produce the initial grids in each area. And the girds are optimized by elliptical differential equation method. Then C-O-H zonal patched grids around multi-element airfoils are produced automatically and efficiently. A time accurate finite-volume integration method is used to solve the compressible laminar and turbulent Navier-Stokes (N-S) equations on the grids. Computational results prove the method to be effective. 展开更多
关键词 multi-element airfoils zonal patched grids finite-volume method N-S equations
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Aerodynamic and Acoustic Optimization for Multi-element Airfoils 认领 引用 被引量：1
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作者 Deng Yiju Duan Zhuoyi Liu Xueqiang 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2018年第4期683-692,共10页
The paper is to integrate aerodynamic and aero-acoustic optimizatiom design of high lift devices,especially for two-element airfoils with slat.Aerodynamic analysis on flow field utilizes a high-order,high-resolution s... The paper is to integrate aerodynamic and aero-acoustic optimizatiom design of high lift devices,especially for two-element airfoils with slat.Aerodynamic analysis on flow field utilizes a high-order,high-resolution spatial differential method for large eddy simulation(LES),which can guarantee accuracy and efficiency.The aeroacoustic analysis for noise level is calculated with Ffowcs Williams-Hawkings(FW-H)integration formula.Fidelity of calculation is verified by standard models.Method of streamline-based Euler simulation(MSES)is used to obtain the aerodynamic characters.Based on the confirmation of numerical methods,detailed research has been conducted for the leading edge slat on multi-element airfoils.Various slot parameter influences on noise are analyzed.The results of the slot optimization parameters can be used in multi-element airfoil design. 展开更多
关键词 slat multi-element airfoil aero-acoustic optimization
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HYBRID CARTESIAN GRID/GRIDLESS METHOD FOR CALCULATING VISCOUS FLOWS OVER MULTI-ELEMENT AIRFOILS 认领 引用 被引量：1
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作者 蒲赛虎 陈红全 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2013年第3期232-236,共5页
A hybrid Cartesian grid/gridless method is developed for calculating viscous flows over multi-element airfoils.The method adopts an unstructured Cartesian grid to cover most areas of the computational domain and leave... A hybrid Cartesian grid/gridless method is developed for calculating viscous flows over multi-element airfoils.The method adopts an unstructured Cartesian grid to cover most areas of the computational domain and leaves only small region adjacent to the aerodynamic bodies to be filled with the cloud of points used in the gridless methods,which results in a better combination of the computational efficiency of the Cartesian grid and the flexibility of the gridless method in handling complex geometries.The clouds of points in the local gridless region are implemented in an anisotropic way according to the features of the thin boundary layer of the viscous flows over the airfoils,and the clouds of points at the vicinity of the interface between the grid and the gridless regions are also controlled by using an adaptive refinement technique during the generation of the unstructured Cartesian grid.An implementation of the resulting hybrid method is presented for solving two-dimensional compressible Navier-Stokes(NS)equations.The simulations of the viscous flows over a RAE2822airfoil or a two-element airfoil are successfully carried out,and the obtained results agree well with the available experimental data. 展开更多
关键词 multi-element airfoil gridless method Cartesian grid viscous flow NS equations
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Geochemical analysis of multi-element in archaeological soils from Tappe Rivi in Northeast Iran 认领 引用
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作者 Abdulmannan Rouhani Hamidreza Azimzadeh +2 位作者 Ahad Sotoudeh Judith Thomalsky Hojat Emami 《Acta Geochimica》 EI CAS CSCD 2022年第1期132-146,共15页
Multi-element analysis in historical sites is a major issue in archaeological studies;however,this approach is almost unknown among Iranian scholars.Geochemical multi-element analysis of soil is very important to eval... Multi-element analysis in historical sites is a major issue in archaeological studies;however,this approach is almost unknown among Iranian scholars.Geochemical multi-element analysis of soil is very important to evaluate anthropogenic activities.The aim of this study consists of assessing the potential usefulness of multi-elemental soil analysis,obtained by Analytical Jena atomic absorption spectrophotometer(AAS) and ICP-MS,to recognize ancient anthropogenic features on the territory of Tappe Rivi(North Khorasan,Iran).For that purpose,a total of 80 ancient soil samples were sampled from each soil horizon and cultural layer.The research involved Fe,Al,Cd,Cu,Ni,Co,Cr,Pb,and P which trace element samples were extracted according to the International Standard ISO 11466 and phosphorus samples by Olsen method.Besides,the contamination of the soils was assessed based on enrichment factors(EFs) by using Fe as a reference element.This geochemical/archaeological approach highlights that the content of most elements in the Parthian and Sassanid ages were significantly higher than the contents of the elements in other zones,which shows that by the development of the eras,the content of the elements has also increased.Also,the accumulation of metals in the Rivi site was significantly higher than in the control area.Among the sampled zones,enrichment factor(EF) indicated that the enrichment of Cu and phosphate at the Parthian and Sassanid had the highest content.This result is important because it shows that the amount of metals and human activities are directly related to each other during different ages. 展开更多
关键词 Tappe Rivi Multi-element Phosphorus Ancient human impact Samalghan plain
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Experiments of Multi-element Composite Foundation with Steel Pipe Pile and Gravel Pile 认领 引用
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作者 王仙芝 郑俊杰 《Journal of Southwest Jiaotong University(English Edition)》 2008年第3期254-259,共6页
A set of serf-developed apparatus for foundation physical model were utilized to conduct model tests of the multi-element composite foundation with a steel pipe pile and several gravel piles. Some load-bearing charact... A set of serf-developed apparatus for foundation physical model were utilized to conduct model tests of the multi-element composite foundation with a steel pipe pile and several gravel piles. Some load-bearing characteristics of the multi-element Composite foundation, including the curves of foundation settlement, stresses of piles, pile-soil stress ratio, and load-sharing ratio of piles and soil, were obtained to study its working performances in silty sand soil. The experimental results revealed that the multi-element composite foundation with steel pipe pile and gravel pile contributed more than the gravel pile composite foundation in improving the bearing capacity of the silty fine sand. 展开更多
关键词 Steel pipe pile Gravel pile Model test Multi-element composite foundation Pile-soil stress ratio Load-sharing ratio
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Monte Carlo simulation of reflection effects of multi-element materials on gamma rays 认领 引用 被引量：6
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作者 Ying-Hong Zuo Jin-Hui Zhu Peng Shang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2021年第1期85-94,共10页
To study the effects of the gamma reflection of multi-element materials,gamma ray transport models of single-element materials,such as iron and lead,and multielement materials,such as polyethylene and ordinary concret... To study the effects of the gamma reflection of multi-element materials,gamma ray transport models of single-element materials,such as iron and lead,and multielement materials,such as polyethylene and ordinary concrete,were established in this study.Relationships among the albedo factors of the gamma photons and energies and average energy of the reflected gamma rays by material type,material thickness,incident gamma energy,and incidence angle of gamma rays were obtained by Monte Carlo simulation.The results show that the albedo factors of single-element and multi-element materials increase rapidly with an increase in the material thickness.When the thickness of the material increases to a certain value,the albedo factors do not increase further but rather tend to the saturation value.The saturation values for the albedo factors of the gamma photons,and energies and the reflection thickness are related not only to the type of material but also to the incident gamma energy and incidence angle of the gamma rays.At a given incident gamma energy,which is between 0.2 and 2.5 MeV,the smaller the effective atomic number of the multi-element material is,the higher the saturation values of the albedo factors are.The larger the incidence angle of the gamma ray is,the greater the saturation value of the gamma albedo factor,saturation reflection thickness,and average saturation energy of the reflected gamma photons are. 展开更多
关键词 Multi-element materials Gamma albedo factor Effective atomic number Monte Carlo simulation
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Exploratory Data Analysis Applied in Mapping Multi-element Soil Geochemical Anomalies for Drill Target Definition:A Case Study from the Unpha Layered Non-magmatic Hydrothermal Pb-Zn Deposit,DPR Korea 认领 引用 被引量：2
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作者 JANG Gwang-Hyok WON Hyon-Chol +1 位作者 HWANG Bo-Hyon CHOI Chol-Man 《Acta Geologica Sinica(English Edition)》 SCIE EI CAS CSCD 2021年第4期1357-1365,共9页
A factor analysis was applied to soil geochemical data to define anomalies related to buried Pb-Zn mineralization.A favorable main factor with a strong association of the elements Zn,Cu and Pb,related to mineralizatio... A factor analysis was applied to soil geochemical data to define anomalies related to buried Pb-Zn mineralization.A favorable main factor with a strong association of the elements Zn,Cu and Pb,related to mineralization,was selected for interpretation.The median+2 MAD(median absolute deviation)method of exploratory data analysis(EDA)and C-A(concentration-area)fractal modeling were then applied to the Mahalanobis distance,as defined by Zn,Cu and Pb from the factor analysis to set the thresholds for defining multi-element anomalies.As a result,the median+2 MAD method more successfully identified the Pb-Zn mineralization than the C-A fractal model.The soil anomaly identified by the median+2 MAD method on the Mahalanobis distances defined by three principal elements(Zn,Cu and Pb)rather than thirteen elements(Co,Zn,Cu,V,Mo,Ni,Cr,Mn,Pb,Ba,Sr,Zr and Ti)was the more favorable reflection of the ore body.The identified soil geochemical anomalies were compared with the in situ economic Pb-Zn ore bodies for validation.The results showed that the median+2 MAD approach is capable of mapping both strong and weak geochemical anomalies related to buried Pb-Zn mineralization,which is therefore useful at the reconnaissance drilling stage. 展开更多
关键词 factor analysis exploratory data analysis Mahalanobis distance multi-element Unpha
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Identifying Pathfinder Elements for Gold in Multi-Element Soil Geochemical Data from the Wa-Lawra Belt, Northwest Ghana: A Multivariate Statistical Approach 认领 引用 被引量：3
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作者 Prosper Mackenzie Nude John Mahfouz Asigri +3 位作者 Sandow Mark Yidana Emmanuel Arhin Gordon Foli Jacob Mawuko Kutu 《International Journal of Geosciences》 CAS 2012年第1期62-70,共9页
A multivariate statistical analysis was performed on multi-element soil geochemical data from the Koda Hill-Bulenga gold prospects in the Wa-Lawra gold belt, northwest Ghana. The objectives of the study were to define... A multivariate statistical analysis was performed on multi-element soil geochemical data from the Koda Hill-Bulenga gold prospects in the Wa-Lawra gold belt, northwest Ghana. The objectives of the study were to define gold relationships with other trace elements to determine possible pathfinder elements for gold from the soil geochemical data. The study focused on seven elements, namely, Au, Fe, Pb, Mn, Ag, As and Cu. Factor analysis and hierarchical cluster analysis were performed on the analyzed samples. Factor analysis explained 79.093% of the total variance of the data through three factors. This had the gold factor being factor 3, having associations of copper, iron, lead and manganese and accounting for 20.903% of the total variance. From hierarchical clustering, gold was also observed to be clustering with lead, copper, arsenic and silver. There was further indication that, gold concentrations were lower than that of its associations. It can be inferred from the results that, the occurrence of gold and its associated elements can be linked to both primary dispersion from underlying rocks and secondary processes such as lateritization. This data shows that Fe and Mn strongly associated with gold, and alongside Pb, Ag, As and Cu, these elements can be used as pathfinders for gold in the area, with ferruginous zones as targets. 展开更多
关键词 Multivariate Analyses Multi-Elements Soil Geochemical Data Pathfinder Elements Gold Northwest Ghana
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Machine-learning-accelerated screening of multi-element doped CuSb catalysts for enhanced C2+ selectivity in CO2 electroreduction 认领 引用
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作者 Xin Cheng Hang Wang +2 位作者 Xun Zhu Yang Wang Qian Fu 《Energy and AI》 EI CSCD 2025年第4期837-848,共12页
Electrochemical CO2 reduction(CO2RR)to value-added fuels and chemicals offers a promising route toward carbon neutrality.However,developing efficient and selective catalysts for the generation of multi-carbon(C_... Electrochemical CO2 reduction(CO2RR)to value-added fuels and chemicals offers a promising route toward carbon neutrality.However,developing efficient and selective catalysts for the generation of multi-carbon(C2+)products remains a significant challenge.In this work,we propose a combined density functional theory(DFT)and machine learning(ML)approach to systematically screen CuSb-based catalysts with varying surface Sb atomic fractions and non-metal dopants(O,N,S,Se,and P)on the Cu2Sb(100)surface for CO2RR.Approximately 200 representative adsorption configurations were randomly selected for DFT calculations,which were then used to train a predictive ML model.This model enables high-accuracy predictions of the adsorption energies of key intermediates(*CO and*H)for the remaining uncalculated configurations.By integrating the K-means clustering analysis and the optimal adsorption energy selection criteria based on the Sabatier principle,the candidate configuration with the best potential for C2+product formation was identified:O-doped CuSb with a surface Sb atomic fraction of 3/12.Mechanistic studies further reveal that O doping significantly strengthens *CO adsorption while suppressing *H adsorption by modulating the electronic structure,thereby lowering the CO2RR energy barrier and improving the thermodynamic selectivity toward C2+products.This work not only elucidates the synergistic effect of surface Sb atomic fraction and non-metal dopants on CO2RR activity,but also establishes a scalable ML prediction and screening framework,providing theoretical support and methodological pathways for the design of high-performance CuSb-based catalysts. 展开更多
关键词 CO2electroreduction CuSb-based catalysts Density functional theory Machine learning multi-element doping
Multi-element analysis by ArF laser excited atomic fluorescence of laser ablated plumes: Mechanism and applications 认领 引用 被引量：10
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作者 Yue Cai Po-Chun Chu +1 位作者 Sut Kam Ho Nai-Ho Cheung 《Frontiers of physics》 SCIE CSCD 2012年第6期670-678,共9页
A new multi-element analysis technique based on laser-excited atomic fluorescence was reviewed. However, the one-wavelength-one-transition constraint was overcome. Numerous elements were induced to fluoresce at a sing... A new multi-element analysis technique based on laser-excited atomic fluorescence was reviewed. However, the one-wavelength-one-transition constraint was overcome. Numerous elements were induced to fluoresce at a single excitation wavelength of 193 nm. This was possible provided that the analytes were imbedded in dense plumes, such as those produced by pulsed laser ablation. The underlying mechanism of the technique was explained and corroborated. Analytical applications to metals, plastics, ceramics and their composites were discribed. Detection limits in the ng/g range and mass limits of atto moles were demonstrated. Several real-world problems, including the analysis of paint coating for trace lead, the non-destructive analysis of potteries and ink, the chemical profiling of electrode plastic interfaces, and the analysis of ingestible lead colloids were discussed. 展开更多
关键词 laser-excited atomic fluorescence （LEAF） argon fluoride laser laser plume spectroscopy multi-element analysis
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An effective strategy to inhibit grain coarsening:Construction of multi-element co-segregated grain boundary complexion 认领 引用 被引量：1
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作者 Le Fu Gabriel Arcuri +4 位作者 Wenjun Yu Bohan Wang Zihua Lei Ying Deng Kathryn Grandfield 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2024年第7期1060-1071,共12页
When exposed to moderate to high temperatures,nanomaterials typically suffer from severe grain coarsening,which has long been a major concern that prevents their wider applications.Here,we proposed an effective strate... When exposed to moderate to high temperatures,nanomaterials typically suffer from severe grain coarsening,which has long been a major concern that prevents their wider applications.Here,we proposed an effective strategy to inhibit grain coarsening by constructing grain boundary(GB)complexions with multiple codoped dopants,which hindered coarsening from both energetic and kinetic perspectives.To demonstrate the feasibility of this strategy,multiple selected dopants were doped into a ZrO2-SiO2nanocrystalline glass ceramic(NCGC)to form GB complexions.The results showed that NCGC was predominantly composed of ZrO2nanocrystallites(NCs)distributed in an amorphous SiO2matrix.Ultrathin layers of GB complexions(~2.5 nm)were formed between adjacent ZrO2NCs,and they were crystalline superstructures with co-segregated dopants.In addition,a small amount of quartz solid solution was formed,and it adhered to the periphery of ZrO2NCs and bridged the adjacent NCs,acting as a“bridging phase”.The GB complexions and the“bridging phase”synergistically enhanced the coarsening resistance of ZrO2NCs up to 1000°C.These findings are important for understanding GB complexions and are expected to provide new insights into the design of nanomaterials with excellent thermodynamic stability. 展开更多
关键词 Zr2-Si2 multi-element co-segregation grain boundary(GB)complexion grain coarsening atom probe tomography(APT)
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Slat cove dynamics of multi-element airfoil at low Reynolds number 认领 引用
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作者 WANG JiangSheng XU Yang WANG JinJun 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2023年第4期1166-1179,共14页
The flow around the slat cove of a two-dimensional 30P30N multi-element airfoil is investigated with time-resolved particle image velocimetry(TR-PIV)at low Reynolds number(Rec=2.41×104and 4.61×104).The... The flow around the slat cove of a two-dimensional 30P30N multi-element airfoil is investigated with time-resolved particle image velocimetry(TR-PIV)at low Reynolds number(Rec=2.41×104and 4.61×104).The effects of angle of attack(α=8°,12°,and 16°)on the mean flow characteristics and vortex dynamics are discussed.The size of the recirculation within the slat cove and the intensity of the shed vortices originating from the slat cusp shear layer are found to generally decrease as the angle of attack increases.The joint time-frequency analyses show that disturbances of different frequencies exist in the slat cusp shear layer and they trigger the different vortex shedding patterns of the slat cusp shear layer.The self-sustained oscillation within the slat cove,normally observed at high Reynolds number(Rec~106),is proved to be responsible for the disturbances of different frequencies and the related vortex dynamics in the current study. 展开更多
关键词 multi-element airfoil slat vortex dynamics time-resolved particle image velocimetry
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Unveiling multi-element synergy in polymetallic oxides for efficient nitrate reduction to ammonia 认领 引用 被引量：5
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作者 Yaning Qie Jiachen Gao +9 位作者 Siqi Li Mingjin Cui Xuejiao Mao Xinyu Wang Bo Zhang Sijia Chi Yiran Jia Quan-Hong Yang Chunpeng Yang Zhe Weng 《Science China Materials》 SCIE EI CAS CSCD 2024年第9期2941-2948,共8页
Electrocatalytic nitrate reduction reaction is considered as a promising and sustainable method for ammonia synthesis.However,the selectivity and yield rate of ammonia are limited by the competitive hydrogen evolution... Electrocatalytic nitrate reduction reaction is considered as a promising and sustainable method for ammonia synthesis.However,the selectivity and yield rate of ammonia are limited by the competitive hydrogen evolution reaction and the complex eight-electron transfer process.Herein,we developed a(FeCoNiCu)Ox/CeO2polymetallic oxide electrocatalyst for effective nitrate reduction to ammonia.The synergistic effects among the multiple elements in the electrocatalyst were clearly elucidated by comprehensive experiments.Specifically,Cu acted as the active site for reducing nitrate to nitrite,and Co facilitated the subsequent reduction of nitrite to ammonia,while Fe and Ni promoted water dissociation to provide protons.Furthermore,the incorporation of CeO2increased the active surface area of(FeCoNiCu)Ox,resulting in an improved ammonia yield rate to meet industrial demands.Consequently,the(FeCoNiCu)Ox/CeO2electrocatalyst achieved an ammonia current density of 382 mA cm-2and a high ammonia yield rate of 30.3 mg h-1cm-2with a long-term stability.This work offers valuable insights for the future design of highly efficient multi-element electrocatalysts. 展开更多
关键词 multi-element synergy electrocatalysis ammonia synthesis polymetallic oxides rapid Joule-heating method
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