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A critical review on solid-state welding of high entropy alloys-processing,microstructural characteristics and mechanical properties of joints

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Defence technology（防务技术） 2024年第4期34卷 78-133页

作者： Tushar Sonar Mikhail Ivanov Evgeny Trofimov Aleksandr Tingaev Ilsiya Suleymanova Department of Welding engineering Institution of Engineering and TechnologySouth Ural State University(National Research University)Chelyabinsk454080Russia Department of Materials Science Physical and Chemical Properties of MaterialsInstitution of Engineering and TechnologySouth Ural State University(National Research University)Chelyabinsk454080Russia

The high entropy alloys(HEAs)are the newly developed high-performance materials that have gained significant importance in defence,nuclear and aerospace sector due to their superior mechanical properties,heat resistance,high temperature strength and corrosion *** alloys are manufactured by the equal mixing or larger proportions of five or more alloying *** exhibit superior mechanical performance compared to traditional engineering alloys because of the extensive alloying composition and higher entropy of *** state welding(SSW)techniques such as friction stir welding(FSW),rotary friction welding(RFW),diffusion bonding(DB)and explosive welding(EW)have been efficiently deployed for improving the microstructural integrity and mechanical properties of welded HEA *** HEA interlayers revealed greater potential in supressing the formation of deleterious intermetallic phases and maximizing the mechanical properties of HEAs *** similar and dissimilar joining of HEAs has been manifested to be viable for HEA systems which further expands their industrial ***,the main objective of this review paper is to present a critical review of current state of research,challenges and opportunities and main directions in SSW of HEAs mainly CoCrFeNiMn and Al_xCoCrFeNi *** state of the art of problems,progress and future outlook in SSW of HEAs are critically reviewed by considering the formation of phases,microstructural evolution and mechanical properties of HEAs joints.

关键词： High entropy alloys Solid state welding Microstructure Mechanical properties

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A Planning Method for Operational Test of UAV Swarm Based on Mission Reliability

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Computer Modeling in engineering & Sciences 2024年第8期140卷 1889-1918页

作者： Jingyu Wang Ping Jiang Jianjun Qi College of Systems engineering National University of Defense TechnologyChangsha410073China Beijing Special engineering Design institution Beijing100028China

The unmanned aerial vehicle(UAV)swarm plays an increasingly important role in the modern battlefield,and the UAV swarm operational test is a vital means to validate the combat effectiveness of the UAV *** to the high cost and long duration of operational tests,it is essential to plan the test in *** solve the problem of planning UAV swarm operational test,this study considers the multi-stage feature of a UAV swarm mission,composed of launch,flight and combat stages,and proposes a method to find test plans that can maximize mission ***,a multi-stage mission reliability model for a UAV swarm is proposed to ensure successful implementation of the mission.A multi-objective integer optimization method that considers both mission reliability and cost is then formulated to obtain the optimal test *** study first constructs a mission reliability model for the UAV swarm in the combat ***,the launch stage and flight stage are integrated to develop a complete PMS(Phased Mission Systems)reliability ***,the Binary Decision Diagrams(BDD)and Multi Objective Quantum Particle Swarm Optimization(MOQPSO)methods are proposed to solve the *** optimal plans considering both reliability and cost are *** proposed model supports the planning of UAV swarm operational tests and represents a meaningful exploration of UAV swarm test planning.

关键词： UAV swarm PMS MOQPSO BDD mission reliability operational test planning

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Theoretical analysis and engineering application of controllable shock wave technology for enhancing coalbed methane in soft and low‑permeability coal seams

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International Journal of Coal Science & technology 2024年第2期11卷 123-142页

作者： Guodong Qiao Zegong Liu Yongmin Zhang Changping Yi Kui Gao Shigui Fu Youzhi Zhao School of Safety Science and engineering Anhui University of Science and TechnologyHuainan 232001AnhuiChina Institute of Energy Hefei Comprehensive National Science CenterHefei 230031AnhuiChina School of Electrical engineering Xi’an Jiaotong UniversityXi’an 710049ShanxiChina Division of Mining and Geotechnical engineering LuleåUniversity of TechnologyLuleåSweden

Coalbed methane(CBM)is a significant factor in triggering coal and gas outburst disaster,while also serving as a clean *** the increasing depth of mining operations,coal seams that exhibit high levels of gas content and low permeability have become increasingly *** controllable shockwave(CSW)technology has proven effective in enhancing CBM in laboratory settings,there is a lack of reports on its field applications in soft and low-permeability coal *** study establishes the governing equations for stress waves induced by *** numerical inversion was employed to analyse the dynamic response of the coal seam during CSW ***,quantitative calculations were performed for the crushed zone,fracture zone,and effective CSW influence range,which guided the selection of field test *** results of the field test unveiled a substantial improvement in the gas permeability coefficient,the average rate of pure methane flowrate,and the mean gas flowrate within a 10 m radius of the antireflection *** enhancements were notable,showing increases of 3 times,13.72 times,and 11.48 times,***,the field test performed on the CSW antireflection gas extraction hole cluster demonstrated a noticeable improvement in CBM *** antireflection,the maximum peak gas concentration and maximum peak pure methane flow reached 71.2%and 2.59 m^(3)/min,*** findings will offer valuable guidance for the application of CSW antireflection technology in soft and low-permeability coal seams.

关键词： CSW antireflection in coal seams CBM extraction enhancement Soft and low-permeability coal seams Field test

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Operational Characteristics of Loop Heat Pipe in Microgravity and Normal Gravity Environments

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Journal of Thermal Science 2024年第4期33卷 1394-1408页

作者： ZHONG Siyuan XIE Rongjian LI Yunfei SUN Xiaojin Shanghai institution of technology and Physics Shanghai200083China University of Chinese Academy of Sciences Beijing100049China Shanghai Institute of Satellite engineering Shanghai200240China

The loop heat pipe(LHP)is an advanced,efficient two-phase heat transfer unit,whose operational performance may be affected by microgravity conditions in contrast to ground-based *** performance of on-orbit temperature data and ground test of a copper-propylene LHP with a condenser temperature range of 243.15 K to 303.15 K were employed to compared and *** LHP has successfully started up for more than 193 times with a good heat transfer performance and a stable start-up stabilization on-orbit under a complex orbital heating environment for more than eight *** a small heat load(10.0W),the average start-up time is 110.0 s while the start-up temperature ranges from 5.71 K-12.78 *** start-up time at large temperature differences in the high temperature zone will be higher than the time required for start-up at smaller temperature differences in the low *** the condenser temperature is 250.0 K,the stable temperature difference on orbit is 3.83 K,which is generally consistent in heat transfer compared to 2.20 K in the ground *** this paper,we can conclude that the on-orbit flight data up to now can provide a reference to the design of subsequent LHP space applications.

关键词： Loop Heat Pipe(LHP) start up microgravity on-orbit experiment

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Exploring the Applications of Digital Twin technology in Enhancing Sustainability in Civil engineering:A Review

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Structural Durability & Health Monitoring 2024年第5期18卷 577-598页

作者： Jiamin Huang Ping Wu Wangxin Li Jun Zhang Yidong Xu School of Civil engineering Chongqing Jiaotong UniversityChongqing400074China School of Civil engineering and Architecture NingboTech UniversityNingbo315100China School of Civil engineering Lanzhou University of TechnologyLanzhou730050China

With the advent of the big data era and the rise of Industrial Revolution 4.0,digital twins(DTs)have gained sig-niﬁcant attention in various *** offer the opportunity to combine the physical and digital worlds and aid the digital transformation of the civil engineering *** this paper,605 documents obtained from the search wereﬁrst analysed using CiteSpace for literature visualisation,and an author co-occurrence network,a keyword co-occurrence network,and a keyword clustering set were ***,through a literature review of 86 papers,this paper summarises the current status of DT application in civil engineering based on a review of the origins,concepts,and implementation techniques of DTs,and it introduces the application of DTs in the full project *** study shows that DTs have great potential to address many of the challenges faced by civil *** this regard,the paper also presents some thoughts on the future directions of DT research.

关键词： Digital twins civil engineering full lifecycle literature visualisation analysis

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Burst-mode pulse generation in passively mode-locked all-fiber green/orange lasers at 543 nm and 602 nm

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Photonics Research 2024年第6期12卷 1231-1238页

作者： QIUJUN RUAN JINHAI ZOU CHUNNA FENG TINGTING CHEN HANG WANG ZHIPENG DONG ZHENGQIAN LUO Fujian Key Laboratory of Ultrafast Laser technology and Applications School of Electronic Science and EngineeringXiamen UniversityXiamen 361005China Shenzhen Research institution of Xiamen University Shenzhen 518000China

We report on the experimental realization of,to the best of our knowledge,the first green and orange passively mode-locked all-fiber *** mode-locking in the burst-pulse status is achieved at the wavelengths of 543.3 nm and 602.5 *** figure-9 cavity comprises the fiber end-facet mirror,gain fiber(Ho^(3+):ZBLAN fiber or Pr^(3+)/Yb^(3+):ZBLAN fiber),and fiber loop mirror(FLM).The FLM with long 460 HP fiber is not only used as an output mirror,but also acts as a nonlinear optical loop mirror for initiating visible-wavelength *** green/orange mode-locked fiber lasers with the fundamental repetition rates of 3.779/5.662 MHz produce long bursts containing ultrashort pulses with the 0.85/0.76 GHz intra-burst repetition rates,*** ultrashort intra-burst pulses stem from the dissipative four-wave-mixing effect in the highly nonlinear FLM as well as the intracavity Fabry–Perot *** bursts of 22.2/11.6 ns with ultrashort pulses of 87/62 ps are obtained in our *** visible-wavelength passively mode-locked lasers in an all-fiber configuration and burst-mode would represent an important step towards miniaturized ultrafast fiber lasers and may contribute to the applications in ablation-cooling micromachining,biomedicine imaging,and scientific research.

关键词： fiber passive pulse

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Development and optimization of object detection technology in pavement engineering: A literature review

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Journal of Road engineering 2024年第2期4卷 163-188页

作者： Hui Yao Yaning Fan Yanhao Liu Dandan Cao Ning Chen Tiancheng Luo Jingyu Yang Xueyi Hu Jie Ji Zhanping You Beijing Key Laboratory of Transportation engineering Faculty of ArchitectureCivil and Transportation EngineeringBeijing University of TechnologyBeijing 100124China School of Civil and Transportation engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044China Department of Civil and Environmental engineering Michigan Technological UniversityHoughtonMI 49931USA

Due to the rapid advancement of the transportation industry and the continual increase in pavement infrastructure,it is difficult to keep up with the huge road maintenance task by relying only on the traditional manual detection *** pavement detection technology with deep learning techniques is available for the research and industry areas by the gradual development of computer vision *** to the different characteristics of pavement distress and the uncertainty of the external environment,this kind of object detection technology for distress classification and location still faces great *** paper discusses the development of object detection technology and analyzes classical convolutional neural network(CNN)*** addition to the one-stage and two-stage object detection frameworks,object detection without anchor frames is introduced,which is divided according to whether the anchor box is used or *** paper also introduces attention mechanisms based on convolutional neural networks and emphasizes the performance of these mechanisms to further enhance the accuracy of object *** network architecture is introduced for mobile and industrial *** stereo cameras and sensors are rapidly developed,a detailed summary of three-dimensional object detection algorithms is also *** reviewing the history of the development of object detection,the scope of this review is not only limited to the area of pavement crack detection but also guidance for researchers in related fields is shared.

关键词： Pavement engineering Object detection Lightweight network Attention mechanism Convolutional neural network

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Strong synergy between physical and chemical properties:Insight into optimization of atomically dispersed oxygen reduction catalysts

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Journal of Energy Chemistry 2024年第4期91卷 36-49页

作者： Yifan Zhang Linsheng Liu Yuxuan Li Xueqin Mu Shichun Mu Suli Liu Zhihui Dai School of Chemistry and Molecular engineering Nanjing Tech UniversityNanjing 211816JiangsuChina State Key Laboratory of Advanced technology for Materials Synthesis and Processing Wuhan University of Technology InstitutionWuhan 430070HubeiChina School of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023JiangsuChina

Atomically dispersed catalysts exhibit significant influence on facilitating the sluggish oxygen reduction reaction(ORR)kinetics with high atom economy,owing to remarkable attributes including nearly 100%atomic utilization and exceptional catalytic ***,accurately controlling atomic physical properties including spin,charge,orbital,and lattice degrees of atomically dispersed catalysts can realize the optimized chemical properties including maximum atom utilization efficiency,homogenous active centers,and satisfactory catalytic performance,but remains ***,through physical and chemical insight,we review and systematically summarize the strategies to optimize atomically dispersed ORR catalysts including adjusting the atomic coordination environment,adjacent electronic orbital and site density,and the choice of dual-atom *** the emphasis is on the fundamental understanding of the correlation between the physical property and the catalytic behavior for atomically dispersed ***,an overview of the existing challenges and prospects to illustrate the current obstacles and potential opportunities for the advancement of atomically dispersed catalysts in the realm of electrocatalytic reactions is offered.

关键词： Atomically dispersed catalysts Coordination environment Electronic orbitals Inter-site distance effect Oxygen reduction reaction

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Contact angle and stability of interfacial nanobubble supported by gas monolayer

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Fundamental Research 2024年第1期4卷 35-42页

作者： Haichang Yang Yaowen Xing Fanfan Zhang Xiahui Gui Yijun Cao Chinese National engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical engineering and technology China University of Mining and TechnologyXuzhou 221116China Henan Province Industrial technology Research institution of Resources and Materials Zhengzhou UniversityZhengzhou 450001China

Since solid-liquid interfacial nanobubbles(INBs)were first imaged,their long-term stability and large contact angle have been perplexing *** study aimed to investigate the influence of internal gas density and external gas monolayers on the contact angle and stability of INB using molecular dynamics ***,the contact angle of a water droplet was simulated at different nitrogen *** results showed that the contact angle increased sharply with an increase in nitrogen density,which was mainly caused by the decrease in solid-gas interfacial ***,when the nitrogen density reached 2.57 nm^(-3),an intervening gas monolayer(GML)was formed between the solid and *** the formation of GML,the contact angle slightly increased with increasing gas *** contact angle increased to 180°when the nitrogen density reached 11.38 nm^(-3),indicating that INBs transformed into a gas layer when they were too *** substrates with different hydrophobicities,the contact angle after the formation of GML was always larger than 140°and it was weakly correlated with substrate *** increase in contact angle with gas density represents the evolution of contact angle from macro-to nano-bubble,while the formation of GML may correspond to stable *** potential of mean force curves demonstrated that the substrate with GML could attract gas molecules from a longer distance without the existence of a potential barrier compared with the bare substrate,indicating the potential of GML to act as a gas-collecting *** research indicated that GML can function as a channel to transport gas molecules to INBs,which favors stability of *** research may shed new light on the mechanisms underlying abnormal contact angle and long-term stability of INBs.

关键词： Interfacial tension Hydrophobicity Potential of mean force Gas density Molecular dynamics simulations

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A Modified Principal Component Analysis Method for Honeycomb Sandwich Panel Debonding Recognition Based on Distributed Optical Fiber Sensing Signals

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Structural Durability & Health Monitoring 2024年第2期18卷 125-141页

作者： Shuai Chen Yinwei Ma Zhongshu Wang Zongmei Xu Song Zhang Jianle Li Hao Xu Zhanjun Wu State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian116024China Beijing Aerospace technology institution Beijing116024China College of Water-Conservancy and Civil engineering Shandong Agricultural UniversityTaian271000China

The safety and integrity requirements of aerospace composite structures necessitate real-time health monitoring throughout their service *** this end,distributed optical fiber sensors utilizing back Rayleigh scattering have been extensively deployed in structural health monitoring due to their advantages,such as lightweight and ease of ***,identifying the precise location of damage from the optical fiber signals remains a critical *** this paper,a novel approach which namely Modified Sliding Window Principal Component Analysis(MSWPCA)was proposed to facilitate automatic damage identification and localization via distributed optical fiber *** proposed method is able to extract signal characteristics interfered by measurement noise to improve the accuracy of damage ***,we applied the MSWPCA method to monitor and analyze the debonding propagation process in honeycomb sandwich panel *** findings demonstrate that the training model exhibits high precision in detecting the location and size of honeycomb debonding,thereby facilitating reliable and efficient online assessment of the structural health state.

关键词： Structural health monitoring distributed opticalﬁber sensor damage identiﬁcation honeycomb sandwich panel principal component analysis

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