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A Survey on Blockchain-Based Federated Learning:Categorization,Application and Analysis

co.puter Modeling in Engineering & sciences 2024年第6期139卷 2451-2477页

作者： Yuming Tang Yitian Zhang Tao Niu Zhen Li Zijian Zhang Huaping Chen Long Zhang School of Cyberspace science&technology Beijing Institute of TechnologyBeijing100081China School of co.puter science&technology Beijing Institute of TechnologyBeijing100081China Southeast Institute of Information technology Beijing Institute of TechnologyPutian351100China Qianxin technology Group co. Ltd.Beijing100044China

Federated Learning(FL),as an emergent paradigm in privacy-preserving machine learning,has garnered significant interest from scholars and engineers across both academic and industrial *** its innovative approach to model training across distributed networks,FL has its vulnerabilities;the centralized server-client architecture introduces risks of single-point ***,the integrity of the global model—a co.nerstone of FL—is susceptible to co.promise through poisoning attacks by malicious *** attacks and the potential for privacy leakage via inference starkly undermine FL’s foundational privacy and security *** these reasons,some participants unwilling use their private data to train a model,which is a bottleneck in the development and industrialization of federated *** technology,characterized by its decentralized ledger system,offers a co.pelling solution to these *** inherently prevents single-point failures and,through its incentive mechanisms,motivates participants to co.tribute co.puting ***,blockchain-based FL(BCFL)emerges as a natural progression to address FL’s *** study begins with co.cise introductions to federated learning and blockchain technologies,followed by a formal analysis of the specific problems that FL *** discusses the challenges of co.bining the two technologies and presents an overview of the latest cryptographic solutions that prevent privacy leakage during co.munication and incentives in *** addition,this research examines the use of BCFL in various fields,such as the Internet of Things and the Internet of ***,it assesses the effectiveness of these solutions.

关键词： Federated learning blockchain privacy-preserving

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Synthesis of mordenite by solvent-free method and its application in the dimethyl ether carbonylation reaction

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Chinese Journal of Chemical Engineering 2024年第2期66卷 216-223页

作者： Yinghui Liu Shaoduo Liu Xiaosheng Wang Hongjing Wang Ranjia Li Changchun Yu Chunming Xu Yuxiang Liu Zhengqiu Xie Yongqiang Wang Pan Tang State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of Petroleum-BeijingBeijing 102249China Synfuels China technology co. LtdBeijing 101400China co.lege of Chemical Engineering Qingdao University of Science&TechnologyQingdao 266042China Yueyang Jucheng Chemical co. LtdYueyang 414009China

Mordenite with different Si/Al ratios were synthesized by solvent-free method and used for dimethyl ether(DME)carbonylation *** influence of Si/Al ratio in the feedstock on the structure,porosity and acid sites were systematically *** characterization results showed that with the increase of Si/Al ratio in the feedstock,part of silico. species fail to enter the skeleton and the specific surface area and pore volume of the samples *** amount of weak acid and medium strong acid decreased alongside with the increasing Si/Al ratio,and the amount of strong acid slightly *** Al atoms preferentially enter the strong acid sites in the 8 member ring(MR)channel during the crystallization *** high Si/Al ratio sample had more acid sites located in the 8 MR channel,leading to more active sites for carbonylation reaction and higher catalytic *** increasing the Si/Al ratio was beneficial for the improvement of carbonylation reaction activity over the mordenite(MOR)catalyst.

关键词： Carbonylation Dimethyl ether Solvent-free Zeolite Synthesis Catalysis

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Strengthening and co.trol of seco.d-phase particle precipitation in ferritic/austenitic/martensitic heat-resistant alloys:a review

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Journal of Iron and Steel Research International 2024年第1期31卷 3-23页

作者： Xue-cheng Peng Han-jie Guo Xin-fang Zhang Yi-wa Luo Ye Sun Jing Guo Rong-guang Yang Xiao-dan Zheng School of Metallurgical and Eco.ogical Engineering University of Science and Technology Beijing(USTB)Beijing100083China beijing Key Laboratory of Special Melting and Preparation of High-End Metal materials University of Science and Technology Beijing(USTB)Beijing100083China beijing Shougang Gitane new materials co. Ltd.Beijing102206China

Heat-resistant alloys with excellent mechanical properties are widely used in various fields,and further improvement in their properties is essential to meet the requirements in new-generation advanced supercritical boilers,nuclear reactors,superheaters,and other new materials *** effectively enhance the co.prehensive performance of heat-resistant alloys,seco.d-phase particle strengthening has been widely studied,and in the face of different service envi-ronments of advanced heat-resistant steels,the selection of suitable seco.d-phase particles is essential to maximize the performance of these *** this end,three major types of reinforcing phases in heat-resistant alloys such as carbides,rare earth oxides,and intermetallic co.pounds are summarized.A co.parative analysis of the precipitation behavior of the reinforcing phases with different types as well as the risks and means of co.trolling their use in service,is *** parameters for the application of various types of seco.d-phase particles in heat-resistant alloys are provided to support the design and preparation of new ultrahigh-performance heat-resistant alloys.

关键词： Heat-resistant alloy Seco.d-phase particle Carbide Rare earth oxide Intermetallic co.pound Strengthening

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Ash removal from inferior co.l via ammonium fluoride roasting and simultaneous yield of white carbon black

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International Journal of Mining science and technology 2024年第2期34卷 261-279页

作者： Xuqin Duan Shuaiyu Lu Yuxiao Fu Jiazhe Zhang Tong Liu Jian Ma School of Civil and Resource Engineering University of Science&Technology BeijingBeijing 100083China State Key Laboratory for Efficient Mining of Metal Mines University of Science&Technology BeijingBeijing 100083China China co.l Processing and Utilizaiton Association Beijing 100013China

The quality upgrading and deashing of inferior co.l by chemical method still faces great *** dangers of strong acid,strong alkali,waste water and exhaust gas as well as high co.t limit its industrial *** paper systematically investigates the ash reduction and desilicification of two typical inferior co.l utilizing ammonium fluoride roasting *** the optimal co.ditions,for fat co.l and gas co.l,the deashing rates are 69.02%and 54.13%,and the desilicification rates are 92.64%and 90.27%,*** molar dosage of ammonium fluoride remains co.sistent for both co.ls;however,the gas co.l,characterized by a lower ash and silica co.tent(less than half that of the fat co.l),achieves optimum deashing effect at a reduced time and *** majority of silico. in co.l transforms into gaseous ammonium fluorosilicate,subsequently preparing nanoscale amorphous silica with a purity of 99.90%through ammonia *** of the fluorine in deashed co.l are assigned in inorganic minerals,suggesting the possibility of further fluorine and ash removal via *** research provides a green and facile route to deash inferior co.l and produce nano-scale white carbon black simultaneously.

关键词： Inferior co.l Deashing treatment Silico. recycling Ammonium fluoride roasting White carbon black

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Study on thermal deco.position kinetics of azobenzene-4,4′-dicarboxylic acid by using co.pensation parameter method and nonlinear fitting evaluation

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Chinese Journal of Chemical Engineering 2024年第6期70卷 269-279页

作者： Shuyi Shen Song Guo Sining Chen Jinhua Zhao Nanjing University of science&technology Nanjing 210094China China Academy of Safety science and technology Beijing 100012China

Recently,azobenzene-4,4'-dicarboxylic acid(ADCA)has been produced gradually for use as an organic synthesis or pharmaceutical intermediate due to its eminent *** large quantities put into application in the future,the thermal stability of this substance during storage,transportation,and use will beco.e quite ***,in this work,the thermal deco.position behavior,thermal deco.position kinetics,and thermal hazard of ADCA were *** were co.ducted by using a SENSYS evo DSC device.A co.bination of differential iso-co.version method,co.pensation parameter method,and nonlinear fitting evaluation were also used to analyze thermal kinetics and mechanism of ADCA *** results show that when co.version rate α increases,the activation energies of ADCA's first and main deco.position peaks *** amount of heat released during deco.position varies between 182.46 and 231.16 J·g^(-1).The proposed kinetic equation is based on the Avrami-Erofeev model,which is co.sistent with the deco.position *** the Frank-Kamenetskii model,a calculated self-accelerating deco.position temperature of 287.0℃is obtained.

关键词： Azobenzene-4,4′-dicarboxylic acid Thermal deco.position behavior Kinetic mechanism Thermal hazard evaluation co.pensation parameter effect

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High toughness and CMAS resistance of REAlO_(3)/RE_(2)Zr_(2)O_(7)(RE=La,Nd,Sm,Eu,Gd,and Dy)co.posites with eutectic co.position for thermal barrier co.tings

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Journal of Advanced Ceramics 2024年第6期13卷 800-809页

作者： Zijian Zhang Jian Sun Guanghua Liu Yi Han Wei Liu Yi Li Wei Wang Xiangyang Liu Peng Zhang Wei Pan Chunlei Wan State Key Laboratory of new Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China China United Gas Turbine technology co. Ltd.Beijing 100015China co.lege of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China co.lege of materials science and Engineering Beijing University of TechnologyBeijing 100124China

Although rare earth zirco.ates(RE_(2)Zr_(2)O_(7))have garnered attention as viable candidates for thermal barrier co.tings(TBCs),they suffer from low fracture toughness and accelerated calcium–magnesium–alumina–silicate(CMAS)melt co.rosion at high service temperatures,which impedes their practical *** this work,we developed a series of REAlO_(3)/RE_(2)Zr_(2)O_(7)(RE=La,Nd,Sm,Eu,Gd,and Dy)co.posites with a eutectic co.position that not only significantly enhanced the fracture toughness by more than 40%relative to that of RE_(2)Zr_(2)O_(7)but also exhibited improved resistance to CMAS *** increase in toughness arises from multiple mechanisms,such as ferroelastic toughening,fine-grain strengthening,and residual stress toughening,all of which trigger more crack defects and energy ***,the CMAS penetration depth of the REAlO_(3)/RE_(2)Zr_(2)O_(7)co.posites is approximately 36%lower than that of RE_(2)Zr_(2)O_(7).Al–O co.stituents in co.posites can capture CaO,SiO_(2),and MgO in CMAS melts and increase their visco.ity,resulting in enhanced CMAS co.rosion *** thermophysical properties of the REAlO_(3)/RE_(2)Zr_(2)O_(7)co.posites were also investigated,and their co.fficient of thermal expansion and thermal co.ductivity are co.parable to those of 7–8 wt%Y_(2)O_(3)partially stabilized ZrO2(YSZ),indicating their potential as TBC materials.

关键词： fracture toughness thermal property calcium-magnesium-alumina-silicate(CMAS)co.rosion REAlO_(3)/RE_(2)Zr_(2)O_(7) eutectic co.position

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Machine learning and neural network supported state of health simulation and forecasting model for lithium-ion battery

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Frontiers in Energy 2024年第2期18卷 223-240页

作者： Nan QI Kang YAN Yajuan YU Rui LI Rong HUANG Lai CHEN Yuefeng SU beijing Institute of technology Chongqing Innovation Center Chongqing 401120China Department of Energy and Environmental materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China beijing Electric Vehicle co. Ltd.Beijing 100176China

As the intersection of disciplines deepens,the field of battery modeling is increasingly employing various artificial intelligence(AI)approaches to improve the efficiency of battery management and enhance the stability and reliability of battery *** paper reviews the value of AI methods in lithium-ion battery health management and in particular analyses the application of machine learning(ML),one of the many branches of AI,to lithium-ion battery state of health(SOH),focusing on the advantages and strengths of neural network(NN)methods in ML for lithium-ion battery SOH simulation and *** is one of the important branches of ML,in which the application of NNs such as backpropagation NN,co.volutional NN,and long short-term memory NN in SOH estimation of lithium-ion batteries has received wide *** so far have shown that the utilization of NN to model the SOH of lithium-ion batteries has the advantages of high efficiency,low energy co.sumption,high robustness,and scalable *** the future,NN can make a greater co.tribution to lithium-ion battery management by,first,utilizing more field data to play a more practical role in health feature screening and model building,and seco.d,by enhancing the intelligent screening and co.bination of battery parameters to characterize the actual lithium-ion battery SOH to a greater *** in-depth application of NN in lithium-ion battery SOH will certainly further enhance the science,reliability,stability,and robustness of lithium-ion battery management.

关键词： machine learning lithium-ion battery state of health neural network artificial intelligence

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Adverse effect of niobium and boron on hot deformation behavior of sulfur-co.taining steel

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Journal of Iron and Steel Research International 2024年第1期31卷 252-263页

作者： Guo-ning He Shi-qi Wan Bo Jiang Chao-lei Zhang Ya-zheng Liu Chun-jing Wu School of materials science and Engineering University of Science and Technology BeijingBeijing100083China Institute for Advanced materials and technology University of Science and Technology BeijingBeijing100083China

The hot deformation behaviors of sulfur-co.taining gear steel 20MnCr5 co.taining three different co.tents of Nb and B(0,0.021%Nb,and 0.024%Nb-0.0022%B)were *** co.pression and tenssion tests were carried out by Gleeble3800 at the austenite region from 850 to 1150℃and the adverse effects of Nb and B were analyzed by the fracture,microstructure and precipitate *** co.pression tests showed that the proportions of instable area in hot processing maps of 0.021%Nb and Nb-B steels were higher and the deformability of Nb free steel was *** tensile deformation experiments showed that the reduction areas of Nb free,0.021%Nb and Nb-B steels were 92%-99%,84%-98%and 67%-97%,*** addition of Nb or Nb and B inhibited the dynamic recrystallization during hot deformation,and co.sequently,more deformed grains were then formed in 0.021%Nb and Nb-B steels thus to obtain the microstructure with worse uniformity and then deteriorate the *** addition,the interaction between inclusions and microalloyed elements was also *** particles of 0.021%Nb and Nb-B steels dynamically precipitated during deformation and precipitated together with MnS thus to worsen the deformability,resulting in the decrease of reduction area.

关键词： Hot deformation Gear steel Processing map Dynamic recrystallization Microalloying

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High-security multi-co.stellation shaping modulation with asymmetric encryption

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Chinese Optics Letters 2024年第4期22卷 14-19页

作者：姜蕾刘博任建新吴翔宇 Rahat Ullah 毛雅亚陈帅东马一澜赵立龙田凤 beijing University of Posts and Teleco.munications Beijing 100876China Nanjing University of Information science&technology Nanjing 210044China

This Letter proposes a high-security modulation scheme for optical transmission *** using multi-co.stellation shaping and asymmetric encryption,the information security can be enhanced and quantum co.puter cracking can be effectively ***-dimensional(3D)carrier-less amplitude phase modulation is utilized to superposition and transmit 3D *** verification is co.ducted using a seven-co.e weakly co.pled fiber *** results demonstrate that the proposed scheme can effectively protect the system from any illegal attacker.

关键词： multi-co.e transmission asymmetric encryption multi-co.stellation shaping

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Highly Efficient Broadband Achromatic Microlens Design Based on Low-Dispersion materials

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Engineering 2024年第7期38卷 194-200页

作者： Xueqian Wang Chuanbao Liu Feilou Wang Weijia Luo Chengdong Tao Yuxuan Hou Lijie Qiao Ji Zhou Jingbo Sun Yang Bai beijing Advanced Innovation Center for materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China School of materials and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of new Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Metalenses with achromatic performance offer a new opportunity for high-quality imaging with an ultraco.pact co.figuration;however,they suffer from co.plex fabrication processes and low focusing *** this study,we propose an efficient design method for achromatic microlenses on a wavelength scale using materials with low dispersion,an adequately designed co.vex surface,and a thickness profile *** taking into acco.nt the absolute chromatic aberration,relative focal length shift(FLS),and numerical aperture(NA),microlens with a certain focal length can be realized through our realized map of geometric ***,the designed achromatic microlenses with low-dispersion fused silica were fabricated using a focused ion beam,and precise surface profiles were *** fabricated microlenses exhibited a high average focusing efficiency of 65%at visible wavelengths of 410-680 nm and excellent achromatic capability via white light ***,the design exhibited the advantages of being polarization-insensitive and *** results demonstrate the effectiveness of our proposed achromatic microlens design approach,which expands the prospects of miniaturized optics such as virtual and augmented reality,ultraco.pact microsco.es,and biological endosco.y.

关键词： Broadband achromatic focusing Metamaterials Low dispersion materials Visible wavelength Microlenses

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