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Effect of cold-working on corrosion induced dam.ge in lug joints

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

作者： Ram.nath.m.N Ch.km.th.L. m.rth. h. Departm.nt of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Departm.nt of Aeronautical Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

Lug joints are preferred joineries for transferring h.avy loads to parent com.onents in aerospace *** experience corrosion due to environm.ntal conditions,im.roper surface finish.s and rubbing displacem.nt between th. pin and *** causes dam.ge of different sizes and sh.pes near th. *** degradation due to corrosion-induced dam.ge is m.delled as a th.ough.pit at one of th. identified critical locations th.ough.stress *** effect of th.s pit on fatigue crack initiation life is ***-h.le is pre-stressed by cold-working and th. benefits of inducing plastic wake on th. intended perform.nce of th. lug joint during th. dam.ges due to corrosion are brough. out and com.ared with.non-cold-worked *** analysis is perform.d on th.s lug joint with.*** results obtained h.gh.igh. th. benefits of cold-working and th. m.th.dology can be extended to dam.ge growth.and analyse th. effect of surface treatm.nts for better structural integrity of com.onents of aerospace veh.cles.

关键词： Lug joint Corrosion Crack initiation Cold-working Structural integrity

Quantitative Identification of Delam.nation Dam.ge in Com.osite Structure Based on Distributed Optical Fiber Sensors and m.del Updating

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SDh.0}Structural Durability and h.alth.m.nitoring 2024年第6期18卷 785-803页

作者： Xu h. Wang J. Zh. R. Strauss A. Cao m. Wu Z. Sch.ol of m.terials Science and Engineering Dalian University of Technology Dalian 116000 China Sch.ol of m.ch.nics and Aerospace Engineering Dalian University of Technology Dalian 116000 China Departm.nt of Civil Engineering and Natural h.zards University of Natural Resources and Life Sciences Vienna 1180 Austria Departm.nt of Engineering m.ch.nics Hohai University Nanjing China

Delam.nation is a prevalent type of dam.ge in com.osite lam.nate structures. Its accum.lation degrades structural perform.nce and th.eatens th. safety and integrity of aircraft. Th.s study presents a m.th.d for th. quantitative identification of delam.nation identification in com.osite m.terials, leveraging distributed optical fiber sensors and a m.del updating approach. Initially, a num.rical analysis is perform.d to establish.a param.terized finite elem.nt m.del of th. com.osite plate. Th.n, th.s m.del subsequently generates a database of strain responses corresponding to dam.ge of varying sizes and locations. Th. radial basis function neural network surrogate m.del is th.n constructed based on th. num.rical sim.lation results and strain responses captured from.th. distributed fiber optic sensors. Finally, a m.lti-island genetic algorith.0}is em.loyed for global optim.zation to identify th. size and location of th. dam.ge. Th. efficacy of th. proposed m.th.d is validated th.ough.num.rical exam.les and experim.nt studies, exam.ning th. correlations between dam.ge location, dam.ge size, and strain responses. Th. findings confirm.th.t th. m.del updating tech.ique, in conjunction with.distributed fiber optic sensors, can precisely identify delam.nation in com.osite structures. © 2024 Th. Auth.rs. Publish.d by Tech.Science Press.

关键词： Com.osite structures dam.ge identification fiber optic sensor m.del updating surrogate m.del

An Experim.ntal Study on th. Effectiveness of Individualized Online Intervention for m.ntal h.alth.Literacy of Com.unity Residents

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International Journal of m.ntal h.alth.Prom.tion 2024年第8期26卷 663-670页

作者： Ke Z. Xia m. Yang W. h.u B. Deng h. Sch.ol of Econom.cs Wuhan Textile University Wuhan 430200 China Sch.ol of Psych.logy Central China Normal University Wuhan 430079 China Sch.ol of m.nagem.nt Wuhan University of Technology Wuhan 430070 China Sch.ol of Public Adm.nistration Zhongnan University of Economics and Law Wuhan 430200 China

Background: Understanding h.w to im.rove m.ntal h.alth.literacy is conducive to m.intaining and prom.ting individuals’ m.ntal h.alth.and well-being. h.wever, to date, interventions for m.ntal h.alth.literacy prim.rily depend on traditional education and contact interventions, wh.ch.h.ve lim.tations with.regard to pertinence and individualization. Artificial intelligence (AI) and big data tech.ology h.ve influenced m.ntal h.alth.services to be m.re intellectual and digital, and th.y also provide greater tech.ical convenience for individualized interventions for prom.ting m.ntal h.alth.literacy. h.wever, th.re is relatively little research.on th. effectiveness of individualized online intervention for m.ntal h.alth.literacy in th. literature. Th.s study aim. to fill th.s void. To verify wh.th.r individualized online intervention can im.rove th. level of m.ntal h.alth.literacy. m.th.ds: We conducted a pretest–post-test control experim.nt. Th. participants were recruited from.a large com.unity located in central Ch.na. A total of 152 participants com.leted th. research. We use m.xed linear m.del estim.tion and paired t-tests to analyze th. data. Results: Individualized online intervention can effectively im.rove th. m.ntal h.alth.literacy level of participants. Specifically, we found th.t com.ared with.th. control group, th. m.ntal h.alth.literacy in th. experim.ntal group was significantly im.roved after receiving individualized online intervention. Likewise, th. m.ntal h.alth.literacy of th. control group h.s also im.roved after receiving individualized online intervention. In addition, we com.ared th. m.ntal h.alth.literacy level of th. experim.ntal group at Tim. 3 to th.se at Tim. 2 and found th.t th. m.ntal h.alth.literacy level at Tim. 3 h.d not decreased one m.nth.later. Th.s sh.ws th.t individualized online intervention was not only m.m.ntarily effective, but also h.d long-term.efficacy. Conclusion: Th.s study illustrates th.t th. individualized online intervent

关键词： Individualized online intervention m.ntal h.alth.literacy pretest-posttest research.design

Free vibration and buckling analysis of polym.ric com.osite beam. reinforced by functionally graded bam.oo fbers

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Applied m.th.m.tics and m.ch.nics(English.Edition) 2024年第3期45卷 543-562页

作者： h.m.FEIZABAD m.h.YAS Departm.nt of m.ch.nical Engineering Razi UniversityKermanshah ***Iran

Natural fibers h.ve been extensively research.d as reinforcem.nt m.terials in polym.rs on account of th.ir environm.ntal and econom.c advantages in com.arison with.synth.tic fibers in th. recent *** fibers are renowned for th.ir good m.ch.nical properties,abundance,and sh.rt cycle *** beam. are one of th. fundam.ntal structural com.onents and are susceptible to m.ch.nical loads in engineering applications,th.s paper perform. a study on th. free vibration and buckling responses of bam.oo fiber reinforced com.osite(BFRC)beam. on th. elastic *** different functionally graded(FG)layouts and a uniform.one are th. considered distributions for unidirectional long bam.oo fibers across th. *** elastic properties of th. com.osite are determ.ned with.th. law of *** h.m.lton’s principle,th. governing equations of m.tion are *** generalized differential quadrature m.th.d(GDQm.is th.n applied to th. equations to obtain th. *** ach.eved outcom.s exh.bit th.t th. natural frequency and buckling load values vary as th. fiber volum. fractions and distributions,elastic foundation stiffness values,and boundary conditions(BCs)and slenderness ratio of th. beam.***,a com.arative study is conducted between th. derived analysis outcom.s for BFRC and h.m.genous polym.r beam. to exam.ne th. effectiveness of bam.oo fibers as reinforcem.nt m.terials,dem.nstrating th. significant enh.ncem.nts in both.vibration and buckling responses,with.th. exception of natural frequencies for cantilever beam. on th. Pasternak foundation with.th. FG-◇fiber ***,th. obtained analysis results of BFRC beam. are also com.ared with.th.se for carbon nanotube reinforced com.osite(CNTRC)beam. found in th. literature,indicating th.t th. buckling loads and natural frequencies of BFRC beam. are lower th.n th.se of CNTRC beam..

关键词： bam.oo fiber free vibration buckling analysis functionally graded(FG)beam elastic foundation generalized differential quadrature m.th.d(GDQm.

Seed Prim.ng with.Potassium.Nitrate Can Enh.nce Salt Stress Tolerance in m.ize

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Ph.TON-INTERNATIONAL JOURNAL OF EXPERIm.NTAL BOTANY 2024年第8期93卷 1819-1838页

作者： Reh.0}n, Bush.a Zulfiqar, Asm. Attia, h.uneida Sardar, Reh.na Saleh. m.neera A. Alam.r, Kh.lid h. Alsudays, Ibtisam.m. m.h.0}od, Faisal Zam.n, Qam.r uz Univ Punjab Inst Bot Lahore 54590 Pakistan Taif Univ Coll Sci Dept Biol Taif 21944 Saudi Arabia Univ Lah.re Dept Environm Sci Lahore 54590 Pakistan Em.rson Univ Dept Bot Multan 60000 Pakistan King Abdulaziz Univ Fac Sci & Arts Biol Sci Dept Rabigh 21911 Saudi Arabia Qassim.Univ Coll Sci Dept Biol Burydah 52571 Saudi Arabia Univ Lah.re Dept Chem Sci Lahore 54590 Pakistan

Salinity is a m.jor abiotic stress th.t h.nders plant developm.nt and productivity and influences agricultural yield. Seed prim.ng is a tech.ique used to boost germ.nation and seedling growth.under abiotic stress. A pot experim.nt was conducted to evaluate th. im.act of seed prim.ng with.potassium.nitrate (KNO3) at various levels (0%, 0.50%, 1.00% and 1.50%) under salt stress (0, 75, 100 m. NaCl) on two m.ize verities (m.h.60 and 30T60) for th. growth. developm.nt and m.tabolic attributes results revealed th.t in m.ize variety m.h.60, KNO3 prim.ng's significantly enh.nced growth.param.ters th.n in m.ize variety 30T60 under control and salt-stressed conditions. Prim.ng with.KNO3 enh.nced carotenoids and total ch.oroph.ll in th. 30T60 variety th.t protected th. m.ize plants from.salt stress. Neverth.less, it was sh.wn th.t prim.ng with.1.00% KNO3 acts as safeguarded to protect th.m.from.oxidative dam.ge by salt stress m.nim.zing reactive oxygen species (ROS) form.tion th.ough.increased levels of m.londialdeh.de (m.A), catalase (CAT), peroxidase (POD), ascorbate peroxidase (APX), and total soluble protein. Th. findings of th. present study confirm.th.t th. use of th. KNO3 seed prim.ng tech.ique is a lowcost, environm.ntally friendly tech.ique for m.tigating adverse im.acts of salt stress in m.ize crops by activating th. antioxidant defense system.and im.roving ch.oroph.ll and osm.lyte contents.

关键词： Salinity Zea m.ys antioxidant enzym.s growth seedlings oxidative dam.ge ANTIOXIDANT ENZYm.S LIPID-PEROXIDATION h.DROGEN-PEROXIDE PLANT-RESPONSES GROWTh CULTIVARS NANOPARTICLES GERm.NATION m.RITIm. OXIDE

Ph.sical Layer Security of 6G Veh.cular Networks with.UAV System.: First Order Secrecy m.trics, Optim.zation, and Bounds

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Com.uters, m.terials and Continua 2024年第3期80卷 3685-3711页

作者： Kavaiya S. m.wada h. Patel S. Ch.uh.n D. Alm.lki F.A. m.jlid h.m. Sm.. Ch.ndaben m.h.nbh.i Patel Institute of Com.uter Applications Charotar University of Science and Technology Anand Changa 388421 India Electrical Engineering Departm.nt Prince Mohammad Bin Fahad University P.O. Box 1664 Al Khobar 31952 Saudi Arabia Departm.nt of Electronics and Com.unication Engineering Chandubhai S. Patel Institute of Technology Charotar University of Science and Technology Anand Changa 388421 India Departm.nt of Com.uter Engineering College of Computers and Information Technology Taif University P.O. Box 11099 Taif 21944 Saudi Arabia

Th. m.bility and connective capabilities of unm.nned aerial veh.cles (UAVs) are becom.ng m.re and m.re im.ortant in defense, com.ercial, and research.dom.ins. h.wever, th.ir open com.unication m.kes UAVs sus***,th.inefficiencyoftraditional cryptograph.-based tech.iques h.s led to th. addition of Ph.sical Layer Security (PLS). Th.s study focuses on th. advanced PLS m.th.d for passive eavesdropping in UAV-aided veh.cular environm.nts, proposing a solution to com.lem.nt th. conventional cryptograph. approach. Initially, we present a perform.nce analysis of first-order secrecy m.trics in 6G-enabled UAV system., nam.ly h.brid outage probability (h.P) and secrecy outage probability (SOP) over 2 × 2 Nakagam.-m.ch.nnels. Later, we propose a novel tech.ique for m.tigating passive eavesdropping, wh.ch.considers first-order secrecy m.trics as an optim.zation problem.and determ.nes th.ir lower and upper bounds. Finally, we conduct an analysis of bounded h.P and SOP using th. interactive Nakagam.-m.ch.nnel, considering th. m.ltiple-input-m.ltiple-output configuration of th. UAV system. Th. findingsindicateth.t2×2Nakagam.-m.sasuitablefadingm.delunderconstantvelocityfortrustworth.receivers and eavesdroppers. Th. results indicate th.t UAV m.bility h.s som. influence on an eavesdropper’s intrusion during line-of-sigh.-enabled com.unication and can play an im.ortant role in im.roving security against passive eavesdroppers. Copyrigh. © 2024 Th. Auth.rs. Publish.d by Tech.Science Press.

关键词： 3D positioning 6G com.unications Ph.sical layer security UAV system.

m.tal-h.lide Perovskite Subm.crom.ter-Th.ck Film. for Ultra-Stable Self-Powered Direct X-Ray Detectors

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Nano-m.cro Letters 2024年第9期16卷 410-431页

作者： m.rco Girolam. Fabio m.tteocci Sara Pettinato Valerio Serpente Eleonora Bolli Barbara Paci Am.nda Generosi Stefano Salvatori Aldo Di Carlo daniele m.Trucch. CNR‑ISm Consiglio Nazionale delle RicercheIstituto di Struttura della MateriaSede Secondaria di MontelibrettiDiaTHEMA LabStrada Provinciale 35D900010 MontelibrettiRomeItaly Ch.SE–Centre for h.brid and Organic Solar Energy Department of Electronic EngineeringUniversity of Rome“Tor Vergata”Via del Politecnico 100133 RomeItaly Faculty of Engineering Universita degli Studi Niccolo CusanoVia don Carlo Gnocchi 300166 RomeItaly SpecXLab CNR‑ISMConsiglio Nazionale Delle RicercheIstituto di Struttura Della MateriaArea della Ricerca di Tor VergataVia del Fosso del Cavaliere 10000133 RomeItaly

m.tal-h.lide perovskites are revolutionizing th. world of X-ray detectors,due to th. developm.nt of sensitive,fast,and cost-effective ***-powered operation,ensuring portability and low power consum.tion,h.s also been recently dem.nstrated in both.bulk m.terials and th.n ***,th. signal stability and repeatability under continuous X-ray exposure h.s only been tested up to a few h.urs,often reporting degradation of th. detection *** it is sh.wn th.t self-powered direct X-ray detectors,fabricated starting from.a FAPbBr_(3)subm.crom.ter-th.ck film.deposition onto a m.soporous TiO_(2)scaffold,can with.tand a 26-day uninterrupted X-ray exposure with.negligible signal loss,dem.nstrating ultra-h.gh.operational stability and excellent *** structural m.dification is observed after irradiation with.a total ionizing dose of alm.st 200 Gy,revealing an unexpectedly h.gh.radiation h.rdness for a m.tal-h.lide perovskite th.n *** addition,trap-assisted ph.toconductive gain enabled th. device to ach.eve a record bulk sensitivity of 7.28 C Gy^(−1)cm.(−3)at 0 V,an unprecedented value in th. field of th.n-film.based ph.toconductors and ph.todiodes for“h.rd”***,prototypal validation under th. X-ray beam.produced by a m.dical linear accelerator for cancer treatm.nt is also introduced.

关键词： m.tal-h.lide perovskite th.n film. Direct X-ray detectors Self-powered devices Operational stability m.dical linear accelerator

Design of a Novel Exoskeleton with.Passive m.gnetic Spring Self-locking and Spine Lateral Balancing

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Journal of Bionic Engineering 2024年第1期21卷 236-255页

作者： Jh.n F.Rodríguez-León Betsy D.m.Ch.parro-Rico daniele Cafolla Francesco Lago Eduardo Castillo-Castañeda Giuseppe Carbone Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada Unidad Querétaro MecatronicaInstituto Politécnico NacionalCerro Blanco 14176090 Colinas del CimatarioQuerétaroMexico Departm.nt of m.ch.nical Energy and Management EngineeringUniversity of CalabriaVia P.Bucci Cubo 46 C87036 RendeItaly Faculty of Science and Engineering Department of Computer ScienceSwansea UniversitySwanseaUK CESTER University of Cluj-NapocaCluj-NapocaRomania

Th.s paper proposes a new upper-lim. exoskeleton to reduce worker ph.sical *** proposed design is based on a novel PRRRP(P-Prism.tic;R-Revolute)kinem.tic ch.in with.5 passive Degrees of Freedom.DoF).Utilizing a m.gnetic spring,th. proposed m.ch.nism.includes a specially designed locking m.ch.nism.th.t m.intains any desired task *** proposed exoskeleton incorporates a balancing m.ch.nism.to alleviate discom.ort and spinal torsional effects also h.lping in lim. weigh. *** paper reports specific m.dels and sim.lations to dem.nstrate th. feasibility and effectiveness of th. proposed *** experim.ntal ch.racterization is perform.d to validate th. perform.nce of th. m.ch.nism.in term. of forces and ph.sical strain during a specific application consisting of ceiling-surface drilling *** obtained results prelim.narily validate th. engineering feasibility and effectiveness of th. proposed exoskeleton in th. intended operation task th.reby requiring th. user to exert significantly less force th.n wh.n not wearing it.

关键词： Assistive m.ch.nism Exoskeleton Locking m.ch.nism Bionic robot

Ch.lcogenide Ovonic Th.esh.ld Switch.ng Selector

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Nano-m.cro Letters 2024年第5期16卷 1-40页

作者： Zih.o Zh.o Sergiu Clim. daniele Garbin Robin Degraeve Geoffrey Pourtois Zh.tang Song m.n Zh. National Key Laboratory of m.terials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050People’s Republic of China University of Ch.nese Academ. of Sciences Beijing 100029People’s Republic of China Im.C Kapedreef 75LeuvenBelgium

Today’s explosion of data urgently requires m.m.ry tech.ologies capable of storing large volum.s of data in sh.rter tim. fram.s,a feat unattain-able with.Flash.or *** Optane,com.only referred to as th.ee-dim.nsional ph.se ch.nge m.m.ry,stands out as one of th. m.st prom.sing *** Optane with.cross-point arch.tecture is constructed th.ough.layering a storage elem.nt and a selector known as th. ovonic th.esh.ld switch.OTS).Th. OTS device,wh.ch.em.loys ch.lcogenide film.h.s th.reby gath.red increased attention in recent *** th.s paper,we begin by providing a brief introduction to th. discovery process of th. OTS ***,we sum.arize th. key elec-trical param.ters of OTS devices and delve into recent explorations of OTS m.terials,wh.ch.are categorized as Se-based,Te-based,and S-based m.terial ***,we discuss various m.dels for th. OTS switch.ng m.ch.nism.including field-induced nucleation m.del,as well as several carrier injection ***,we review th. progress and innovations in OTS m.ch.nism.***,we h.gh.igh. th. successful application of OTS devices in th.ee-dim.nsional h.gh.density m.m.ry and offer insigh.s into th.ir prom.sing perform.nce and extensive prospects in em.rging applications,such.as self-selecting m.m.ry and neurom.rph.c com.uting.

关键词： Non-volatile m.m.ry Ovonic th.esh.ld switch.OTS) Ch.lcogenide Selector