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Review on application progress of federated learning model and security hazard protection

Digital Communications and Networks 2023年第1期9卷 146-158页

作者： Aimin Yang Zezhong Ma Chunying Zhang Yang han Zhibin hu wei Zhang Xiangdong huang Yafeng Wu Hebei Engineering Research Center for the Intelligentization of Iron Ore Optimization and Ironmaking Raw Materials Preparation Processes North China University of Science and TechnologyTangshanHebeiChina Hebei Key Laboratory of Data Science and Application North China University of Science and TechnologyTangshanHebeiChina The Key Laboratory of Engineering Computing in Tangshan City North China University of Science and TechnologyTangshanHebeiChina Tangshan Intelligent Industry and Image Processing Technology Innovation Center North China University of Science and TechnologyTangshanHebeiChina College of Science North China University of Science and TechnologyTangshanHebeiChina College of Artificial Intelligence North China University of Science and TechnologyTangshanHebeiChina

Federated learning is a new type of distributed learning framework that allows multiple participants to share training results without revealing their data *** data privacy becomes more important,it becomes difficult to collect data from multiple data owners to make machine learning predictions due to the lack of data *** is forced to be stored independently between companies,creating“data silos”.With the goal of safeguarding data privacy and security,the federated learning framework greatly expands the amount of training data,effectively improving the shortcomings of traditional machine learning and deep learning,and bringing AI algorithms closer to our *** the context of the current international data security issues,federated learning is developing rapidly and has gradually moved from the theoretical to the applied *** paper first introduces the federated learning framework,analyzes its advantages,reviews the results of federated learning applications in industries such as communication and healthcare,then analyzes the pitfalls of federated learning and discusses the security issues that should be considered in applications,and finally looks into the future of federated learning and the application layer.

关键词： Data silos Machine learning Federated learning Privacy protection Learning framework

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Improvement in hydrogen storage performance of Mg by mechanical grinding with molten salt etching Ti3C2Clx

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Progress in Natural Science:Materials International 2023年第2期33卷 211-224页

作者： Shuaicheng hu Lijun Lv Guo Yang wei Liu Hong Miao Honghui Cheng Xingbo han Zifeng Lin School of Mechanical Engineering Yang Zhou University Shanghai Institute of Applied Physics Chinese Academy of Sciences College of Materials Science and Engineering Sichuan University

Mg-based materials are currently a hot research topic as hydrogen storage materials due to their considerable theoretical hydrogen storage capacity. However, the kinetic performance of hydrogen absorption and desorption of Mg is too slow and requires high temperature, which seriously hinders the application of this material. MXene is a new type of two-dimensional material with significant role in improving thermodynamics and kinetics. In this experiment, a two-dimensional layered MXene containing Cl functional group was prepared by molten salt etching using the Ti-containing MAX phase as the raw material. Then different ratios of Ti3C2Clxwere uniformly dispersed onto the surface of Mg by high energy ball milling. The samples were characterized by hydrogen absorption and desorption kinetics, SEM, XRD, XPS, and DSC to investigate the effect of Ti3C2Clxon the hydrogen absorption and desorption performance of Mg. The onset hydrogen absorption temperature can be reduced to room temperature and the hydrogen release temperature is reduced by 200°C by doping Ti3C2Clx. And there is also 5.4 wt% hydrogen storage in the isothermal hydrogen absorption test at 400°C. The results of DSC demonstrate that the Eaof Mg+15 wt% Ti3C2Clxwas reduced by 12.6% compared to pristine Mg. The ΔH is almost invariable. The results of XPS show that the presence of multivalent Ti promotes electron transfer and thus improves the conversion between Mg2+/Mg and H-/H. This study provides a guideline for further improving the hydrogen absorption and desorption performance of Mg-based hydrogen storage materials.

关键词： Hydrogen storage materials Molten salt synthesis Catalyst doping MXene Mg

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Mechanisms of rotenone-induced neurotoxicity in PC 12 cells

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Neural Regeneration Research 2008年第12期3卷 1281-1285页

作者： wei han Lizhong Sun Jiafeng Chen Ming Chang Hongyan huo Linsen hu First Department of Neurology Brain Hospital of Jilin Province Siping 136000 Jifin Province China Department of Neurology First Hospital of Jilin University Changchun 130021 Jilin Province China

BACKGROUND： Rotenone-induced neurotoxicity in PC 12 cells has been widely used to study the pathogenesis of Parkinson＇s disease. However, the precise mechanisms underlying rotenone-induced dopaminergic neuronal degeneration in Parkinson＇s disease remains unclear. OBJECTIVE： To establish rotenone-induced neurotoxicity in PC 12 cells, and to investigate the possible action pathways to rotenone-induced neural cell injury at the protein level. DESIGN, TIME AND SETTING： A controlled proteomics study was performed at the Department of Neurology, First Hospital, Jilin University between March 2006 and March 2007. MATERIALS： PC 12 cells were obtained from Shanghai Cell Bank of Chinese Academy of Sciences, China. Rotenone was provided by Sigma, USA. METHODS： PC 12 cells in logarithmic growth phase were treated under experimental and control conditions, respectively. A total of 0.5 μmol/L rotenone, or the same amount of Dulbecco＇s modified eagle＇s medium （DMEM）, was added in the experimental and control conditions, respectively. MAIN OUTCOME MEASURES： Following 72 hours of rotenone treatment, cellular survival rate was determined by methyl thiazolyl tetrazolium assay, and apoptotic changes were detected by Hoechst 33342 staining. Total cellular protein was extracted to acquire differential protein expression data utilizing two-dimensional differential in-gel electrophoresis. To identify differential protein spots, matrix-assisted laser desorption/ionization-time of flight mass spectrometry （MALDI-TOF-MS） was used. RESULTS： In the MTT assay, the experimental condition induced significantly less cell survival compared to the control condition （P 〈 0.01）. Hoechst 33342 staining revealed a larger number of apoptotic cells under the experimental condition compared to the control condition （P 〈 0.01）, as determined by the presence of nuclear condensation, pyknosis, and nuclear fragmentation. Two-dimensional electrophoresis results showed that the differential expression of protein

关键词： PC 12 cells rotenone proteomics cytotoxic effect

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Sulfur Flow Analysis for New Generation Steel Manufacturing Process

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Journal of Iron and Steel Research International 2008年第4期15卷 12-15,37页

作者： hu Chang-qing ZhanG Chun-xia han Xiao-wei YIN Rui-yu College of Metallurgy and Energy Hebei Polytechnic University Tangshan 063009 Hebei China State KeyLaboratory of Advanced Steel Process and Products Central Iron and Steel Research Institute Beijing 100081 China

Sulfur flow for new generation steel manufacturing process is analyzed by the method of material flow analysis, and measures for SO2 emission reduction are put forward as assessment and target intervention of the results. The results of sulfur flow analysis indicate that 90 % of sulfur comes from fuels. Sulfur finally discharges from the steel manufacturing route in various steps, and the main point is BF and BOF slag desulfurization. In sintering process, the sulfur is removed by gasification, and sintering process is the main source of SO2 emission. The sulfur content of coke oven gas （COG） is an important factor affecting SO2 emission. Therefore, SO2 emission reduction should be started from the optimization and integration of steel manufacturing route, sulfur burden should be reduced through energy saving and consumption reduction, and the sulfur content of fuel should be controlled. At the same time, BF and BOF slag desulfurization should be optimized further and coke oven gas and sintering exhausted gas desulfurization should be adopted for SO2 emission reduction and reuse of resource, to achieve harmonic coordination of economic, social, and environmental effects for sustainable development.

关键词： material flow analysis sulfur flow analysis steel industry sustainable development SO2 emission

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Designing of multifunctional and flame retardant separator towards safer high-performance lithium-sulfur batteries

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Nano Research 2021年第12期14卷 4865-4877页

作者： Junling Wang wei Cai Xiaowei Mu Longfei han Na Wu Can Liao Yongchun Kan Yuan hu State Key Laboratory of Fire Science CAS Key Laboratory of Soft Matter ChemistryUniversity of Science and Technology of ChinaHefei230026China Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control College of Safety Science and EngineeringNanjing Tech UniversityNanjing211816China

Owing to unprecedented merits such as high theoretical capacity,superior energy density and low cost,lithium-sulfur batteries(LSBs)show a bright future both in scientific and industrial ***,the inherent issues,including highly insulating character,undesired shuttle behavior and lithium dendrites growth,are seriously impeding its practical ***,a metal-organic-frameworks(MOFs)derived N,S co-doped carbon nanotube hollow architecture confining with CoS_(2) nanoparticles(CoS_(2)/NSCNHF)modified separator is designed to surmount these *** with Celgard separator,this designed separator shows obviously enhanced flame retardancy,giving 73.1%and 53.0%reductions in peak heat release rate and total heat release,***,its hollow structure,conductive feature,electrocatalytic activity and Lewis acid-base interaction enable the efficient inhibition on shuttle behavior as well as boost in polysulfides conversion *** cell with modified separator delivers a high discharge capacity of 1,284.5 mAh·g^(−1).After running for 100 cycles,a discharge capacity of 661.3 mAh·g^(−1) is ***,the suppression on lithium dendrites growth is also observed,manifesting the enhanced battery ***,this work may shed light on the effective usage of MOFs-derived hierarchical composite in achieving LSBs with high electrochemical performance as well as safety.

关键词： metal-organic-frameworks shuttle behavior lithium dendrites flame retardancy

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Experimental study on reactivity and inorganic component transformation of activated fuels in a fluidized bed

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Chinese Journal of Chemical Engineering 2024年第10期74卷 52-62页

作者： Yujie hu wei Li Rui Chen Chi Zhang Shaobo han Ruifang Cui Jiangong Lin Qiangqiang Ren State Key Laboratory of Coal Conversion Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Shanxi Datong University Datong 037009China

The gasification and combustion of activated fuels produced from fluidized beds are beneficial for achieving clean and efficient coal *** this study,a high-calcium coal was used for the activation process,carried out in a high-temperature vertical fluidized *** carbon and ash characteristics of activated fuels were *** reactivity of activated fuels was characterized using Raman test,and scanning electron microscopy coupled with energy-dispersive spectrometry(SEM-EDS).Inorganic components were characterized using X-ray diffraction(XRD)and X-ray fluorescence spectrometry(XRF).With the increase in temperature and equivalence ratio(ER),the graphitization degree of activated fuels decreases,and a higher proportion of active sites leads to,a better activation *** activation effect is optimized at the equivalence ratio of *** the temperature rises,the calcium-containing minerals in the raw coal are gradually transformed into anorthite(CaAl_(2)SiO_(7)),and the anhydrite(CaSO_(4))reacts with the reducing gas(CO)to produce oldhamite(CaS);Fe_(2)O_(3),as a fluxing agent,is prone to melting with silica-aluminates at high *** the particle size of activated fuel increased,the relative enrichment index(REI)of heavy metals decreased.

关键词： Activation Fluidized-bed Microstructure Ash characteristics Mineral transformation Ash fusion

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Flat-plate hypersonic boundary-layer ?ow instability and transition prediction considering air dissociation

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Applied Mathematics and Mechanics(English Edition) 2019年第5期40卷 719-736页

作者： Yufeng han wei CAO Department of Mechanics Tianjin University

The effects of air dissociation on ?at-plate hypersonic boundary-layer ?ow instability and transition prediction are studied. The air dissociation reactions are assumed to be in the chemical equilibrium. Based on the ?at-plate boundary layer, the ?ow stability is analyzed for the Mach numbers from 8 to 15. The results reveal that the consideration of air dissociation leads to a decrease in the unstable region of the ?rst-mode wave and an increase in the maximum growth rate of the second mode. High frequencies appear earlier in the third mode than in the perfect gas model, and the unstable region moves to a lower frequency region. When the Mach number increases, the second-mode wave dominates the transition process, and the third-mode wave has little effect on the transition. Moreover, when the Mach number increases from 8 to 12, the N-factor envelope becomes higher, and the transition is promoted. However, when the Mach number exceeds 12, the N-factor envelope becomes lower, and the transition is delayed. The N-factor envelope decreases gradually with the increase in the altitude or Mach number.

关键词： air dissociation transition prediction boundary layer

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Multiple scenario simulation and optimization of an urban green infrastructure network based on complex network theory:a case study in Harbin City,China

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Ecological Processes 2022年第1期11卷 439-454页

作者： Shuang Song Shao‑han Wang Meng‑Xi Shi Shan‑Shan hu Da‑wei Xu College of Landscape Architecture Northeast Forestry UniversityHarbin 150000China Key Lab for Garden Plant Germplasm Development&Landscape Eco‑Restoration in Cold Regions of Heilongjiang Province Harbin 150000China

Background:Urban green infrastructure(GI)networks play a significant role in ensuring regional ecological security;however,they are highly vulnerable to the influence of urban development,and the optimization of GI networks with better connectivity and resilience under different development scenarios has become a practical problem that urgently needs to be *** Harbin,a megacity in Northeast China,as the case study,we set five simulation scenarios by adjusting the economic growth rate and extracted the GI network in multiple scenarios by integrating the minimal cumulative resistance model and the gravity *** low‑degree‑first(LDF)strategy of complex network theory was introduced to optimize the GI network,and the optimization effect was verified by robustness ***:The results showed that in the 5%economic growth scenario,the GI network structure was more complex,and the connectivity of the network was better,while in the other scenarios,the network structure gradually degraded with economic *** optimization by the LDF strategy,the average degree of the GI network in multiple scenarios increased from 2.368,2.651,2.189,1.972,and 1.847 to 2.783,3.125,2.643,2.414,and 2.322,respectively,and the GI network structure connectivity and resilience were significantly enhanced in all ***:Economic growth did not necessarily lead to degradation of the GI network;there was still room for economic development in the study area,but it was limited under existing GI conditions,and the LDF strategy was an effective method to optimize the GI *** research results provide a new perspective for the study of GI network protection with urban economic growth and serve as a methodological reference for urban GI network optimization.

关键词： GI network Simulation Complex network theory LDF strategy Robustness

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干旱半干旱地区变时滞反应扩散植被-水系统的阈值动力学

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应用数学 2025年第1期38卷 71-78页

作者：胡静朱磊任杰吴涵张启敏宁夏大学土木与水利工程学院宁夏银川750021 宁夏大学数学统计学院宁夏银川750021 宁夏医科大学医学信息与工程学院宁夏银川750021 宁夏数学基础学科研究中心宁夏银川750021 可口可乐(饮料)上海有限公司上海200123

考虑地表水的渗透和扩散作用对干旱半干旱地区生态系统的影响,本文建立了具有时变时滞的反应扩散植被-水系统模型.给出阈值R^(∗),并讨论了系统的动力学行为,当R^(∗)1,植被一致持久.此外,通过拉丁方抽样(LHS)及偏秩相关系数(PRCCs)方法... 详细信息

考虑地表水的渗透和扩散作用对干旱半干旱地区生态系统的影响,本文建立了具有时变时滞的反应扩散植被-水系统模型.给出阈值R^(∗),并讨论了系统的动力学行为,当R^(∗)1,植被一致持久.此外,通过拉丁方抽样(LHS)及偏秩相关系数(PRCCs)方法对模型阈值进行敏感性分析,给出了参数对系统动力学行为的影响并为制定防治荒漠化的措施提出建议.此外,通过分析系统有限时间稳定性,讨论了时滞对植被水模型的动力学行为的影响.

关键词：植被-水模型阈值动力学反应扩散敏感性分析有限时间稳定

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Investigation of electropolishing characteristics of tungsten in ecofriendly sodium hydroxide aqueous solution

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Advances in Manufacturing 2020年第3期8卷 265-278页

作者： wei han Feng-Zhou Fang Centre of Micro/Nano manufacturing Technology(MNMTDublin) University College DublinDublin 4Ireland State Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing Technology(MNMT)Tianjin UniversityTianjin 300072People’s Republic of China

In this study,an eco-friendly electrolyte for electropolishing tungsten and the minimum material removal depth on the electropolished tungsten surface are investigated using an electrochemical etching *** a concentrated acid electrolyte,the polarization curve and current density transient are *** a NaOH electrolyte,the effects of interelectrode gap and electrolyte concentration on electropolishing are *** differences in electropolishing characteristics are compared among different electrolyte *** are etched on the electropolished tungsten surface to determine the minimum material removal depth on the tungsten *** results indicate the color effect due to a change in the thickness of the oxide film on the tungsten surface after electropolishing with a concentrated acid *** surface roughness decreases with the interelectrode gap width owing to the increased current density when using the NaOH ***,the electropolishing effect is less prominent with a significantly smaller gap because the generated bubbles are unable to escape from the narrow working gap in time.A material removal depth of less than 10 nm is achieved on the tungsten surface in an area of diameter 300 lm,using the electrochemical etching method.

关键词： Electropolishing NaOH solution Surface roughness Tungsten Etching

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