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Nuclear Science and Techniques 2023年第10期34卷 20-35页

作者： He-Xing Yin jia-Bao Guan Shun-Qiang Tian ji-ke wang The Institute for Advanced Studies Wuhan UniversityWuhan 430072China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China

Multi-objective evolutionary algorithms(MOEAs) are typically used to optimize two or three objectives in the accelerator field and perform well. However, the performance of these algorithms may severely deteriorate when the optimization objectives for an accelerator are equal to or greater than four. Recently, many-objective evolutionary algorithms(MaOEAs)that can solve problems with four or more optimization objectives have received extensive attention. In this study, two diffraction-limited storage ring(DLSR) lattices of the Extremely Brilliant Source(ESRF-EBS) type with different energies were designed and optimized using three MaOEAs and a widely used MOEA. The initial population was found to have a significant impact on the performance of the algorithms and was carefully studied. The performances of the four algorithms were compared, and the results demonstrated that the grid-based evolutionary algorithm(GrEA) had the best *** OEAs were applied in many-objective optimization of DLSR lattices for the first time, and lattices with natural emittances of 116 and 23 pm·rad were obtained at energies of 2 and 6 GeV, respectively, both with reasonable dynamic aperture and local momentum aperture(LMA). This work provides a valuable reference for future many-objective optimization of DLSRs.

关键词： Storage ring lattices Many-objective evolutionary algorithms GrEA algorithm NSGA

Design of S-band photoinjector with high bunch charge and low emittance based on multi-objective genetic algorithm

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Nuclear Science and Techniques 2023年第3期34卷 93-105页

作者： Ze-Yi Dai Yuan-Cun Nie Zi Hui Lan-Xin Liu Zi-Shuo Liu jian-Hua Zhong jia-Bao Guan ji-ke wang Yuan Chen Ye Zou Hao-Hu Li jian-Hua He The Institute for Advanced Studies Wuhan UniversityWuhan 430072China

High-brightness electron beams are required to drive LINAC-based free-electron lasers(FELs)and storage-ring-based synchrotron radiation light *** bunch charge and RMS bunch length at the exit of the LINAC play a crucial role in the peak current;the minimum transverse emittance is mainly determined by the injector of the ***,a photoin-jector with a high bunch charge and low emittance that can simultaneously provide high-quality beams for 4th generation synchrotron radiation sources and FELs is *** design of a 1.6-cell S-band 2998-MHz RF gun and beam dynamics optimization of a relevant beamline are presented in this *** dynamics simulations were performed by combining ASTRA and the multi-objective genetic algorithm NSGA *** effects of the laser pulse shape,half-cell length of the RF gun,and RF parameters on the output beam quality were analyzed and *** normalized transverse emittance was optimized to be as low as 0.65 and 0.92 mm·mrad when the bunch charge was as high as 1 and 2 nC,***,the beam stability properties of the photoinjector,considering misalignment and RF jitter,were simulated and analyzed.

关键词： Electron linear accelerator Photoinjector Beam dynamics Multi-objective genetic algorithm

Processing,microstructure,and mechanical properties of wire arc additively-manufactured AZ91 magnesium alloy using cold arc process

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中国有色金属学报 2025年第1期35卷 91-104页

作者： Bai-hao CAI ji-kang FAN jie LI Dong-qing YANG Yong PENG ke-hong wang key Laboratory of Controlled Arc Intelligent Additive Technology Ministry of Industry and Information TechnologyNanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

Thin walls of an AZ91 magnesium alloy with fine equiaxed grains were fabricated via cold arc-based wire arc additive manufacturing(CA-WAAM),and the droplet transfer behaviours,microstructures,and mechanical properties were *** results showed that the cold arc process reduced splashing at the moment of liquid bridge breakage and effectively shortened the droplet transfer *** microstructures of the deposited samples exhibited layered characteristics with alternating distributions of coarse and fine *** layer-by-layer deposition,the β-phase precipitated and grew preferentially along grain boundaries,while the fineη-Al_(8)Mn_(5)phase was dispersed in the α-Mg *** mechanical properties of the CA-WAAM deposited sample showed isotropic *** ultimate tensile strength and elongation in the building direction(BD)were 282.7 MPa and 14.2%,*** microhardness values of the deposited parts were relatively uniform,with an average value of HV 69.6.

关键词： AZ91 magnesium alloy droplet transfer microstructure mechanical properties cold arc process

FedCLCC:A personalized federated learning algorithm for edge cloud collaboration based on contrastive learning and conditional computing

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Defence Technology(防务技术) 2025年第1期43卷 80-93页

作者： Kangning Yin Xinhui ji Yan wang Zhiguo wang School of Information and Software Engineering University of Electronic Science and Technology of ChinaChengdu611731China Institute of Public Security Kash Institute of Electronics and Information IndustryKashi844000China

Federated learning(FL)is a distributed machine learning paradigm for edge cloud *** can facilitate data-driven decision-making in tactical scenarios,effectively addressing both data volume and infrastructure challenges in edge ***,the diversity of clients in edge cloud computing presents significant challenges for *** federated learning(pFL)received considerable attention in recent *** example of pFL involves exploiting the global and local information in the local *** pFL algorithms experience limitations such as slow convergence speed,catastrophic forgetting,and poor performance in complex tasks,which still have significant shortcomings compared to the centralized *** achieve high pFL performance,we propose FedCLCC:Federated Contrastive Learning and Conditional *** core of FedCLCC is the use of contrastive learning and conditional *** learning determines the feature representation similarity to adjust the local *** computing separates the global and local information and feeds it to their corresponding heads for global and local *** comprehensive experiments demonstrate that FedCLCC outperforms other state-of-the-art FL algorithms.

关键词： Federated learning Statistical heterogeneity Personalized model Conditional computing Contrastive learning

Surface micro-arrays enhancing electromagnetic interference shielding of polydimethylsiloxane/multiwalled carbon nanotubes nanocomposites

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Nano Research 2025年第1期18卷 508-519页

作者： ke jiang Zhi Chen ji Yu Chen Zheng Shan Huang Ming wang Chongqing key Laboratory of Soft-Matter Material Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China School of Mechanics Civil Engineering and ArchitecturesNorthwestern Polytechnical UniversityXi’an 710072China jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory(Rongjiang Laboratory) Jieyang 515200China

Herein,the electromagnetic shielding performance of surface concave-convex(SC)and zig-zag micro-arrays was studied by using a simulation prediction and a three-dimensional(3D)printing custom ***,surface stripe concaveconvex(SSC)and surface cylindrical concave-convex(SCC)micro-arrays with or without zig-zag micro-arrays are designed,and their shielding performance is simulated in multi-bands(C-,X-band).The multiwalled carbon nanotubes/polydimethylsiloxane composites(MWCNT/PDMS)with different SC structures and different electrical conductivity are molded in acrylonitrile-butadiene-styrene copolymer(ABS)molds which are printed by a 3D *** results show that the electromagnetic interference shielding effectiveness(EMI SE)of the samples can be enhanced by constructing the SC micro-arrays with zig-zag micro-arrays,and improving with the increase of conductivity and *** addition,the shielding mechanism of the SC-MWCNT/PDMS composites is investigated and discussed by an electromagnetic simulation.

关键词： surface micro-arrays electrical properties electromagnetic interference(EMI)shielding three-dimensional(3D)printing

Electrocatalytic nitrite reduction to ammonia on isolated bismuth alloyed ruthenium

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Journal of Energy Chemistry 2025年第1期100卷 369-376页

作者： Shiyao Shang Fuzhou wang Zeyi Sun Chaofan Qiang ke Chu School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070GansuChina

Electrochemical reduction of NO_(2)-to NH_(3)(NO_(2)-RR) is recognized as an appealing approach for achieving renewable NH_(3)synthesis and waste NO_(2)-***,we report isolated Bi alloyed Ru (Bi1Ru) as an efficient NO_(2)-RR *** calculations and in situ electrochemical measurements reveal the creation of Bi1-Ru dual sites which can remarkably promote NO_(2)-activation and suppress proton adsorption,while accelerating the NO_(2)-RR protonation energetics to render a high NO_(2)--to-NH_(3)conversion ***,Bi1Ru assembled in a flow cell delivers an NH_(3)yield rate of 1901.4μmol h^(-1)cm^(-2)and an NH_(3)-Faradaic efficiency of 94.3%at an industrial-level current density of 324.3 mA cm^(-2).This study offers new perspectives for designing and constructing p-block single-atom alloys as robust and high-current-density NO_(2)-RR catalysts toward the ammonia electrosynthesis.

关键词： Electrocatalytic reduction of NO_(2)-to NH_(3) Theoretical computations In situel ectrochemical measurements p-Block single-atom alloys

Mercury contents and potential exposure risk of rice-containing food products

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Journal of Environmental Sciences 2025年第2期148卷 683-690页

作者： Xin wang Yingjun wang Yaqi Zhang Ziyan Liu Xiaomeng ji Yong Cai Shandong key Laboratory of Environmental Processes and Health School of Environmental Science and EngineeringShandong UniversityQingdao 266237China Department of Chemistry&Biochemistry Florida International UniversityMiamiFL 33199USA

Mercury(Hg),especially methylmercury(MeHg),accumulation in rice grain due to rice paddy possessing conditions conducive to Hg methylation has led to human Hg exposure through consumption of rice-based daily *** addition to being a food staple,rice is widely used as a raw material to produce a vast variety of processed food *** is known about Hg levels in snacking rice-food products and potential Hg exposure from consumption of them,besides previous studies on infant rice *** to provide complementary information for a more complete assessment on Hg exposure risk originated from Hgcontaining rice,this study determined total Hg(THg)and MeHg levels in 195 rice-containing and rice-free processed food products covering all major types of snack foods marketed in China and the estimated daily intake(EDI)of dietary Hg from the consumption of these *** results clearly showed THg and MeHg contents in rice-containing foods were significantly higher than rice-free products,suggesting the transfer of Hg and MeHg from the rice to the end products,even after manufacturing ***,significant positive correlations were observed between THg,MeHg,or MeHg/THg ratio and rice content for samples containing multiple grains as ingredients,further indicating the deciding role of rice for Hg levels in the end food *** the EDI of THg and MeHg via ricebased food products were relatively low compared to the reference dose,it should be considered these snacking food products would contribute additive Hg intake outside of the daily regular meals.

关键词： Mercury Methylmercury Processed food products Rice Dietary exposure

Co-loading Pd and CeO_(2)on Silicalite-1 as High-performance Catalyst for Methane Dry Reforming Reaction

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Chemical Research in Chinese Universities 2025年第1期41卷 15-20页

作者： XU jing ZHANG Rui wang ke wang Xiao SONG Shuyan ZHANG Hongjie State key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022P.R.China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026P.R.China Department of Chemistry Tsinghua UniversityBeijing100084P.R.China

The methane dry reforming(DRM)reaction can convert CO_(2)and CH_(4),both of which contribute to climate change,into syngas,which holds great significance in mitigating specific environmental issues stemming from the greenhouse ***,the challenges that persist include the substantial energy consumption and the catalyst’s susceptibility to deactivation,both of which necessitate ***,we developed a catalyst,PdCe/S1,featuring small-sized Pd species and CeO_(2)stabilized on pure silicon zeolite(silicalite-1),which is employed in the DRM *** can achieve 97%CH_(4)conversion and 98%CO_(2)conversion at 750℃,surpassing binary Pd/CeO_(2)and Pd/S1 *** small size of CeO_(2)stabilized by silicalite-1 promotes oxygen defects formation and enhances the CO_(2)adsorption *** introduction of silicalite-1 further enhances the interaction between Pd and CeO_(2),boosting DRM performance.

关键词： Dry reforming of methane CeO_(2) Zeolite

Machine learning based damage state identification:A novel perspective on fragility analysis for nuclear power plants considering structural uncertainties

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Earthquake Engineering and Engineering Vibration 2025年第1期24卷 201-222页

作者： Zheng Zhi wang Yong Pan Xiaolan ji Duofa College of Civil Engineering Taiyuan University of TechnologyTaiyuan 030024China key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of EducationHarbin 150090China key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China

Seismic fragility analysis(SFA)is known as an effective probabilistic-based approach used to evaluate seismic *** are various sources of uncertainties associated with this approach.A nuclear power plant(NPP)system is an extremely important infrastructure and contains many structural uncertainties due to construction issues or structural deterioration during *** of structural uncertainties effects is a costly and time-consuming endeavor.A novel approach to SFA for the NPP considering structural uncertainties based on the damage state is proposed and *** results suggest that considering the structural uncertainties is essential in assessing the fragility of the NPP structure,and the impact of structural uncertainties tends to increase with the state of ***,machine learning(ML)is found to be superior in high-precision damage state identification of the NPP for reducing the time of nonlinear time-history analysis(NLTHA)and could be applied in the damage state-based ***,the impact of various sources of uncertainties is investigated through sensitivity *** Sobol and Shapley additive explanations(SHAP)method can be complementary to each other and able to solve the problem of quantifying seismic and structural uncertainties simultaneously and the interaction effect of each parameter.

关键词： seismic fragility analysis damage state structural uncertainties machine learning sensitivity analysis

Oxidation-reduction process of Arabidopsis thaliana roots induced by bisphenol compounds based on RNA-seq analysis

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Journal of Environmental Sciences 2025年第2期148卷 188-197页

作者： Xiaotong ji Weiwei wang jiande Li Liangpo Liu Huifeng Yue Department of Environmental Health School of Public HealthShanxi Medical UniversityTaiyuan 030001China MOE key Laboratory of Coal Environmental Pathogenicity and Prevention Shanxi Medical UniversityTaiyuan 030001China Center for Ecological Public Health Security of Yellow River Basin Shanxi Medical UniversityTaiyuan 030001China Department of Public Health Laboratory Sciences School of Public HealthShanxi Medical UniversityTaiyuan 030001China College of Environment and Resource Research Center of Environment and HealthShanxi UniversityTaiyuan 030006China

Bisphenol compounds(BPs)have various industrial uses and can enter the environment through various *** evaluate the ecotoxicity of BPs and identify potential gene candidates involved in the plant toxicity,Arabidopsis thaliana was exposed to bisphenol A(BPA),BPB,BPE,BPF,and BPS at 1,3,10 mg/L for a duration of 14 days,and their growth status were *** day 14,roots and leaves were collected for internal BPs exposure concentration detection,RNA-seq(only roots),and morphological *** shown in the results,exposure to BPs significantly disturbed root elongation,exhibiting a trend of stimulation at low concentration and inhibition at high ***,BPs exhibited pronounced generation of reactive oxygen species,while none of the pollutants caused significant changes in root *** exposure concentration analysis indicated that BPs tended to accumulate in the roots,with BPS exhibiting the highest level of *** results of RNA-seq indicated that the shared 211 differently expressed genes(DEGs)of these 5 exposure groups were enriched in defense response,generation of precursormetabolites,response to organic substance,response to oxygen-containing,response to hormone,oxidation-reduction process and so *** unique DEGs in each group,BPS wasmainly associated with the redox pathway,BPB primarily influenced seed germination,and BPA,BPE and BPF were primarily involved in metabolic signaling *** results provide newinsights for BPs induced adverse effects on Arabidopsis thaliana and suggest that the ecological risks associated with BPA alternatives cannot be ignored.

关键词： Bisphenol compounds Arabidopsis thaliana Root elongation RNA-seq ROS