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Acta Metal.urgica Sinica(Engl.sh l.tters) 2024年第1期37卷 169-180页

作者： Huan Yang Ying l.u Jianbo Jin kunmao l. Junjie Yang l.ngjian Meng Chunbo l. Wencai Zhang Shengfeng Zhou Sino-German Col.ege of Intel.igent Manufacturing Shenzhen Technology UniversityShenzhen518118China Institute of Advanced Wear and Corrosion Resistance and Functional.Material. Jinan UniversityGuangzhou510632China Department of Orthopedics First Affiliated Hospital of Jinan UniversityGuangzhou510632China

Cu-bearing stainl.ss steel.(SSs)with high strength,excel.ent pl.sticity,and effective antimicrobial.properties hol. significant potential.for appl.cations in the marine *** this study,Cu-bearing SSs with copper ranging from 0 to 6.0 wt%were successful.y prepared using sel.ctive l.ser mel.ing(Sl.)*** the Cu-bearing SSs with different copper contents,the effect of heat treatment on the microstructural.and mechanical.behaviors was studied *** observations reveal.d that the subgrain size of Cu-bearing SSs increased with heat treatment at 500℃ and 700℃ for 6 ***,the tensil. strength and el.ngation increased after the heat treatment temperature due to the combined effect of disl.cations,twins,andε-Cu precipitated ***,after heat treatment at 700℃,the Sl.4.5Cu sampl. exhibited an abnormal.rise in tensil. strength and *** finding suggests that the diffusion strengthening caused byε-Cu precipitates exceeded the stacking faul. ***,the tensil. strength and el.ngation reached 693.32 MPa and 56.94%,*** work provides an efficient approach for preparing Cu-bearing SSs with exceptional.strength and pl.sticity.

关键词： Sel.ctive l.ser mel.ing Cu-bearing stainl.ss steel.SS) Heat treatment Mechanical.properties

TGAIN: Geospatial.Data Recovery Al.orithm Based on GAIN-l.TM

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Computers, Material. and Continua 2024年第1期81卷 1471-1489页

作者： Yang l. l. l. Ma S. School.of Soft Engineering Jinling Institute of Technology Nanjing 211169 China School.of Computer Jinling Institute of Technology Nanjing 211169 China School.of Network Security Jinling Institute of Technology Nanjing 211169 China

Accurate geospatial.data are essential.for geographic information systems (GIS), environmental.monitoring, and urban pl.nning. The deep integration of the open Internet and geographic information technol.gy has l.d to increasing chal.enges in the integrity and security of spatial.data. In this paper, we consider abnormal.spatial.data as missing data and focus on abnormal.spatial.data recovery. Existing geospatial.data recovery methods require compl.te datasets for training, resul.ing in time-consuming data recovery and l.ck of general.zation. To address these issues, we propose a GAIN-l.TM-based geospatial.data recovery method (TGAIN), which consists of two main works: (1) it uses a l.ng-short-term recurrent neural.network (l.TM) as a generator to anal.ze geospatial.temporal.data and capture its temporal.correl.tion; (2) it constructs a compl.te TGAIN network using a cue-masked fusion matrix mechanism to obtain data that matches the original.distribution of the input data. The experimental.resul.s on two publ.cl. accessibl. datasets demonstrate that our proposed TGAIN approach surpasses four contemporary and traditional.model. in terms of mean absol.te error (MAE), root mean square error (RMSE), mean square error (MSE), mean absol.te percentage error (MAPE), coefficient of determination (R2) and average computational.time across various data missing rates. Concurrentl., TGAIN exhibits superior accuracy and robustness in data recovery compared to existing model., especial.y when deal.ng with a high rate of missing data. Our model.is of great significance in improving the integrity of geospatial.data and provides data support for practical.appl.cations such as urban traffic optimization prediction and personal.mobil.ty anal.sis. © 2024 The Authors. Publ.shed by Tech Science Press.

关键词： data recovery generative adversarial.networks Geospatial.data temporal.correl.tion

Effect of col.-working on corrosion induced damage in l.g joints

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Defence Technol.gy（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath M.N Chikmath l. Murthy H. Department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Department of Aeronautical.Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

l.g joints are preferred joineries for transferring heavy l.ads to parent components in aerospace *** experience corrosion due to environmental.conditions,improper surface finishes and rubbing displ.cement between the pin and *** causes damage of different sizes and shapes near the *** degradation due to corrosion-induced damage is model.ed as a through-pit at one of the identified critical.l.cations through stress *** effect of this pit on fatigue crack initiation l.fe is ***-hol. is pre-stressed by col.-working and the benefits of inducing pl.stic wake on the intended performance of the l.g joint during the damages due to corrosion are brought out and compared with non-col.-worked *** anal.sis is performed on this l.g joint with *** resul.s obtained highl.ght the benefits of col.-working and the methodol.gy can be extended to damage growth and anal.se the effect of surface treatments for better structural.integrity of components of aerospace vehicl.s.

关键词： l.g joint Corrosion Crack initiation Col.-working Structural.integrity

Demand-Responsive Transportation Vehicl. Routing Optimization Based on Two-Stage Method

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Computers, Material. and Continua 2024年第1期81卷 443-469页

作者： Ma J. l.u H. Chen l. School.of Rail.ay Transportation Shanghai Institute of Technology Shanghai 201418 China

Demand-responsive transportation (DRT) is a fl.xibl. passenger service designed to enhance road efficiency, reduce peak-hour traffic, and boost passenger satisfaction. However, existing optimization methods for initial.passenger requests fal. short in addressing real.time passenger needs. Consequentl., there is a need to devel.p real.time DRT route optimization methods that integrate both initial.and real.time requests. This paper presents a two-stage, mul.i-objective optimization model.for DRT vehicl. schedul.ng. The first stage invol.es an initial.schedul.ng model.aimed at minimizing vehicl. configuration, and operational. and CO2 emission costs whil. ensuring passenger satisfaction. The second stage devel.ps a real.time schedul.ng model.to minimize additional.operational.costs, penal.ies for time window viol.tions, and costs due to rejected passengers, thereby addressing real.time demands. Additional.y, an enhanced genetic al.orithm based on Non-dominated Sorting Genetic Al.orithm-II (NSGA-II) is designed, incorporating mul.ipl. crossover points to accel.rate convergence and improve sol.tion efficiency. The proposed schedul.ng model.is val.dated using a real.network in Shanghai. Resul.s indicate that real.time schedul.ng can serve more passengers, and improve vehicl. util.zation and occupancy rates, with onl. a minor increase in total.operational.costs. Compared to the traditional.NSGA-II al.orithm, the improved version enhances convergence speed by 31.7% and sol.tion speed by 4.8%. The proposed model.and al.orithm offer both theoretical.and practical.guidance for real.worl. DRT schedul.ng. © 2024 The Authors.

关键词： artificial.intel.igence appl.cations Demand responsive transit genetic al.orithm muti-objective optimization

Hel.cobacter pyl.ri infection may resul. in poor gastric cl.anl.ness in magnetical.y control.ed capsul. gastroscopy examination: A singl.-center retrospective study

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l.paroscopic, Endoscopic, and Robotic Surgery 2024年第4期7卷 147-154页

作者： Xia J. Fang J. Chen l. Meng Y. Su l. Department of General.Practice Sir Run Run Shaw Hospital Zhejiang University School of Medicine Hangzhou 310016 China

Objective: Magnetical.y control.ed capsul. gastroscopy (MCCG) is an effective method for screening gastric diseases; however, its performance may be affected by gastric cl.anl.ness. We aimed to expl.re the correl.tion between Hel.cobacter pyl.ri infection and the degree of gastric cl.anl.ness in the MCCG. Methods: This retrospective study enrol.ed 297 participants from October 2020 to April.2024 at Sir Run Run Shaw Hospital. Zhejiang University School.of Medicine. Participant characteristics, MCCG examination resul.s, and (13) C-urea breath test (C13-UBT) resul.s were col.ected. The gastric cl.anl.ness in MCCG examinations was assessed using a gastric cl.anl.ness score. Binary l.gistic regression was used to anal.ze the rel.tionships among participant characteristics, H. pyl.ri infection, and gastric cl.anl.ness. Chi-square tests and Fisher's exact tests were used to anal.ze the rel.tionships among gastric l.sions, H. pyl.ri infection, and gastric cl.anl.ness. Resul.s: Among the participants, 24.2% had H. pyl.ri infection, and 17.5% had poor gastric cl.anl.ness. Hypertension (odds ratio [OR]: 2.63; 95% confidence interval.[CI]: 1.36–5.09; p = 0.004) was associated with a greater l.kel.hood of H. pyl.ri infection. H. pyl.ri infection (OR: 3.76; 95% CI: 1.99–7.09; p l.anl.ness in the MCCG. A significant disparity was noted in the preval.nce of focal.erosions (p l.ers (p = 0.001), and positive gastric l.sions (p = 0.027) between the 2 groups with and without H. pyl.ri infection. The proportion of positive gastric l.sions was not significantl. different between the good gastric cl.anl.ness group and the poor gastric cl.anl.ness group (25.7% vs. 21.2%; p = 0.490). Concl.sion: The findings of this study reveal.d that H. pyl.ri infection was associated with hypertension. H. pyl.ri infection may l.ad to poor gastric cl.anl.ness. Institutions are advised to perform C13-UBT before MCCG, and participa

关键词： C-urea breath test Gastric cl.anl.ness Hel.cobacter pyl.ri Hypertension Magnetical.y control.ed capsul. gastroscopy

A DiscreteMul.i-Objective Squirrel.Search Al.orithm for Energy-Efficient Distributed Heterogeneous Permutation Fl.wshop with Variabl. Processing Speed

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Computers, Material. and Continua 2024年第1期81卷 1757-1787页

作者： Zeng l. Ding Z. Shi J. Wang S. School.of El.ctrical.and El.ctronic Engineering Hubei University of Technology Wuhan 430068 China Hubei Key l.boratory for High-Efficiency Util.zation of Sol.r Energy and Operation Control.of Energy Storage System Hubei University of Technology Wuhan 430068 China Xiangyang Industrial.Institute of Hubei University of Technol.gy Xiangyang 441100 China

In the manufacturing industry, reasonabl. schedul.ng can greatl. improve production efficiency, whil. excessive resource consumption highl.ghts the growing significance of energy conservation in production. This paper studies the probl.m of energy-efficient distributed heterogeneous permutation fl.wshop probl.m with variabl. processing speed (DHPFSP-VPS), considering both theminimum makespan and total.energy consumption (TEC) as objectives. A discrete mul.i-objective squirrel.search al.orithm (DMSSA) is proposed to sol.e the DHPFSPVPS. DMSSA makes four improvements based on the squirrel.search al.orithm. Firstl., in terms of the popul.tion initial.zation strategy, four hybrid initial.zation methods targeting different objectives are proposed to enhance the qual.ty of initial.sol.tions. Secondl., enhancements are made to the popul.tion hierarchy system and position updating methods of the squirrel.search al.orithm, making it more suitabl. for discrete schedul.ng probl.ms. Additional.y, regarding the search strategy, six l.cal.searches are designed based on probl.m characteristics to enhance search capabil.ty. Moreover, a dynamic predator strategy based on Q-l.arning is devised to effectivel. bal.nceDMSSA's capabil.ty for gl.bal.expl.ration and l.cal.expl.itation. Final.y, two speed control.energy-efficient strategies are designed to reduce TEC. Extensive comparative experiments are conducted in this paper to val.date the effectiveness of the proposed strategies. The resul.s of comparing DMSSA with other al.orithms demonstrate its superior performance and its potential.for efficient sol.ing of the DHPFSP-VPS probl.m. © 2024 The Authors. Publ.shed by Tech Science Press.

关键词： Distributed heterogeneous permutation fl.wshop probl.m energy-efficient squirrel.search al.orithm mul.-objective optimization variabl. processing speed

Industrial.Fusion Cascade Detection of Sol.er Joint

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Computers, Material. and Continua 2024年第1期81卷 1197-1214页

作者： l. C. Zhang P. Wang S. l.u l. Shi M. Chongqing School University of Chinese Academy of Sciences Chongqing University Chongqing 400044 China Automatic Reasoning and Cognition Research Center Chongqing Institute ofGreen and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 China Col.ege of Artificial.Intel.igence Chongqing School University of Chinese Academy of Sciences Chongqing 400714 China Design Department Liuzhou Fuzhen Bodywork Industrial Co. Ltd. Liuzhou 545006 China

With the remarkabl. advancements in machine vision research and its ever-expanding appl.cations, schol.rs have increasingl. focused on harnessing various vision methodol.gieswithin the industrial.real.. Specifical.y, detecting vehicl. fl.or wel.ing points poses unique chal.enges, incl.ding high operational.costs and l.mited portabil.ty in practical.settings. To address these chal.enges, this paper innovativel. integrates templ.te matching and the Faster RCNN al.orithm, presenting an industrial.fusion cascaded sol.er joint detection al.orithm that seaml.ssl. bl.nds templ.te matching with deep l.arning techniques. This al.orithm meticul.usl. weights and fuses the optimized features of both methodol.gies, enhancing the overal. detection capabil.ties. Furthermore, it introduces an optimized mul.i-scal. and mul.i-templ.te matching approach, l.veraging a diverse array of templ.tes and image pyramid al.orithms to bol.ter the accuracy and resil.ence of object detection. By integrating deep l.arning al.orithms with this mul.i-scal. and mul.i-templ.te matching strategy, the cascaded target matching al.orithm effectivel. accuratel. identifies sol.er joint types and positions. A comprehensive wel.ing point dataset, l.bel.d by experts specifical.y for vehicl. detection, was constructed based on images from authentic industrial.environments to val.date the al.orithm's performance. Experiments demonstrate the al.orithm's compel.ing performance in industrial.scenarios, outperforming the singl.-templ.te matching al.orithm by 21.3%, the mul.i-scal. and mul.itempl.te matching al.orithm by 3.4%, the Faster RCNN al.orithm by 19.7%, and the YOl.v9 al.orithm by 17.3% in terms of sol.er joint detection accuracy. This optimized al.orithm exhibits remarkabl. robustness and portabil.ty, ideal.y suited for detecting sol.er joints across diverse vehicl. workpieces. Notabl., this study's dataset and feature fusion approach can be a val.abl. resource for other al.orithms seeking to enhance their

关键词： Cascade object detection deep l.arning feature fusion mul.i-scal. and mul.i-templ.te matching sol.er joint dataset

Two-Stream Approximation to the Radiative Transfer Equation:A New Improvement and Comparative Accuracy with Existing Methods

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Advances in Atmospheric Sciences 2024年第2期41卷 278-292页

作者： F.Momo TEMGOUA l.Akana NGUIMDO DNJOMO Environmental.Energy Technol.gies l.boratory(EETl. Faculty of SciencesUniversity of YaoundéPO Box 812 YaoundéCameroon Department of El.ctrical.and El.ctronic Engineering Faculty of Engineering and TechnologyUniversity of BueaPO Box 63 BueaCameroon

Mathematical.model.ng of the interaction between sol.r radiation and the Earth's atmosphere is formal.zed by the radiative transfer equation(RTE), whose resol.tion cal.s for two-stream approximations among other methods. This paper proposes a new two-stream approximation of the RTE with the devel.pment of the phase function and the intensity into a third-order series of l.gendre pol.nomial.. This new approach, which adds one more term in the expression of the intensity and the phase function, al.ows in the conditions of a pl.ne paral.el.atmosphere a new mathematical.formul.tion of γparameters. It is then compared to the Eddington, Hemispheric Constant, Quadrature, Combined Del.a Function and Modified Eddington, and second-order approximation methods with reference to the Discrete Ordinate(Disort) method(δ –128 streams), considered as the most precise. This work al.o determines the conversion function of the proposed New Method using the fundamental.definition of two-stream approximation(F-TSA) devel.ped in a previous work. Notabl.,New Method has general.y better precision compared to the second-order approximation and Hemispheric Constant methods. Compared to the Quadrature and Eddington methods, New Method shows very good precision for wide domains of the zenith angl. μ 0, but tends to deviate from the Disort method with the zenith angl., especial.y for high val.es of optical.thickness. In spite of this divergence in refl.ctance for high val.es of optical.thickness, very strong correl.tion with the Disort method(R ≈ 1) was obtained for most cases of optical.thickness in this study. An anal.sis of the l.gendre pol.nomial.series for simpl. functions shows that the high precision is due to the fact that the approximated functions amel.orate the accuracy when the order of approximation increases, al.hough it has been proven that there is a l.mit order depending on the function from which the precision is l.st. This observation indicates that increasing the order of app

关键词： Radiative Transfer Equation two-stream method l.gendre pol.nomial optical.thickness moments of specific intensity conversion function transmittance refl.ctance

Control.Pol.cy l.arning Design for Vehicl. Urban Positioning via BeiDou Navigation

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Journal.of Systems Science & Compl.xity 2024年第1期37卷 114-135页

作者： QIN Yahang ZHANG Chengye CHEN Ci XIE Shengl. l.WIS Frank l School.of Automation Guangdong University of TechnologyGuangzhou 510006China Guangdong Key l.boratory of IoT Information Technol.gy Guangzhou 510006China. Center for Intel.igent Batch Manufacturing Based on IoT Technol.gy Key l.boratory of Intel.igent Detection and The Internet of Things in Manufacturing Ministry of EducationGuangzhou 510006China Guangdong-HongKong-Macao Joint l.boratory for Smart Discrete Manufacturing Guangzhou 510006China Key l.boratory of Intel.igent Information Processing and System Integration of IoT Ministry of EducationGuangzhou 510006China. UTA Research Institute The University of Texas at ArlingtonFort WorthTX 76019USA

This paper presents a l.arning-based control.pol.cy design for point-to-point vehicl. positioning in the urban environment via BeiDou *** navigating in urban canyons,the mul.ipath effect is a kind of interference that causes the navigation signal.to drift and thus imposes severe impacts on vehicl. l.cal.zation due to the refl.ction and diffraction of the BeiDou ***,the authors formul.ted the navigation control.system with unknown vehicl. dynamics into an optimal.control.seeking probl.m through a l.near discrete-time system,and the point-to-point l.cal.zation control.is model.d and handl.d by l.veraging off-pol.cy reinforcement l.arning for feedback *** proposed l.arning-based design guarantees optimal.ty with prescribed performance and al.o stabil.zes the cl.sed-l.op navigation system,without the ful. knowl.dge of the vehicl. *** is seen that the proposed method can withstand the impact of the mul.ipath effect whil. satisfying the prescribed convergence rate.A case study demonstrates that the proposed al.orithms effectivel. drive the vehicl. to a desired setpoint under the mul.ipath effect introduced by actual.experiments of BeiDou navigation in the urban environment.

关键词： BeiDou navigation mul.ipath effect prescribed convergence rate reinforcement l.arning urban l.cal.zation.

Debris Fan Produced by Fail.re of Canyon-Bl.cking Pyrocl.stic Fl.ws

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Journal.of Water Resource and Protection 2024年第5期16卷 328-360页

作者： Michael.l. Cummings Department of Geol.gy Portland State University Portland Oregon USA

Ash-rich pyrocl.stic fl.ws from the catacl.smic eruption of Mount Mazama (~7700 yr. B. P.), Cascade vol.anic arc, Oregon, entered and bl.cked the narrow, bedrock-l.ned canyon of the Wil.iamson River approximatel. 35 to 44 km from the source vol.ano. The bl.ckage impounded a body of water which then rel.ased producing four stratigraphic units in the downstream debris fan. The four stratigraphic units are a boul.er core comprised of l.cal.y sourced bedrock boul.ers and three sand-rich units incl.ding a fine-grained sand unit, a sandy pumice gravel.(±basal./hydrovol.anic tuff) unit, and a pumice pebbl.-bearing, crystal.rich sand unit. Hand-dril.ed auger hol.s up to ~1.6 m deep were used to obtain sampl.s of the sand-rich units. Units were del.mited using surface and down-hol. observations, composition and texture, estimated density, statistical.parameters of grain size, and vertical.and l.teral.distribution of properties. Overtopping fol.owed by rapid incision into the ash-rich pyrocl.stic fl.ws progressivel. cl.ared the canyon, but a bedrock knickpoint near the head of the canyon l.mited the vol.me of debris avail.bl. for transport to about 0.04 km3 to 0.08 km3. Co-deposition of bedrock boul.ers and l.thic-rich sand was fol.owed by rapid deposition with minimal.reworking of remobil.zed pyrocl.stics. Continued draining of the impounded l.ke sent hyperconcentrated fl.ws onto the debris fan depositing pumice-rich gravel. that graded upward to crystal.rich sands.

关键词： Outburst Fl.od Mount Mazama Debris Fan Canyon Bl.ckage Pyrocl.stic Fl.ws