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Optimum pr.files of Endwall Contour.ng for.Enhanced net Heat Flux r.duction and Aer.dynamic per.or.ance

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Jour.al of Har.in Institute of Technology(new Ser.es) 2024年第2期31卷 80-92页

作者： Ar.un K S Tide p S Biju n Division of Mechanical Engineer.ng School of EngineeringCochin University of Science&TechnologyKalamassery 682022India

Successfully utilized non-axisymmetr.c endwalls to enhance tur.ine efficiencies(aer.dynamic and tur.ine inlet temper.tur.s)by contr.lling the char.cter.stics of the secondar. flow in a blade *** is accomplished by steady-state numer.cal hydr.dynamics and deep knowledge of the field of *** of the inter.ction between mainstr.am and pur.e flow contr.buting supplementar. losses in the stage,non-axisymmetr.c endwalls ar. highly susceptible to the inception of pur.e flow exit compar.d to the flat and any advantage r.pidly *** conclusions r.veal that the supr.me endwall patter. could yield a lower.ng of the gr.ss pr.ssur. loss at the design stage and is r.lated to the size of the top-loss location being pr.ductively *** has led to diminished global ther.al exchange lower.d in the passage of the vane *** r.ver.e flow adjacent to the suction side cor.er.of the endwall is migr.ted far.her.fr.m the vane sur.ace,as the deviated pr.ssur. spr.ad on the endwall acceler.tes the flow and pr.gr.sses the r.ver.e flow cor. still *** depleted association between the tor.ado-like vor.ex and the cor.er.vor.ex adjacent to the suction side cor.er.of the endwall is the dominant mechanism of contr.l in the contour.d end *** this publication,we show that the non-axisymmetr.c endwall contour.ng by selective numer.cal shape change method at most pr.minent locations is advantageous in lower.ng the ther.al load in tur.ines to augment the net heat flux r.duction as well as the aer.dynamic per.or.ance using multi-objective optimization.

关键词： endwall contour.ng tur.ine vane heat tr.nsfer phantom cooling coolant injection net heat flux r.duction aer.dynamic per.or.ance

Tur.ine passage Secondar. Flow Dynamics and Endwall Heat Tr.nsfer.Under.Differ.nt Inflow Tur.ulence

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Jour.al of Har.in Institute of Technology(new Ser.es) 2024年第3期31卷 51-62页

作者： Ar.un K S Tide p S Biju n Division of Mechanical Engineer.ng School of EngineeringCochin University of Science&TechnologyKalamassery 682022India

This study pr.sents endwall hydr.dynamics and heat tr.nsfer.in a linear.tur.ine cascade at r. 5×105 at low and high intensities of *** ar. numer.cally pr.dicted using the standar. SST model and r.θ-γtr.nsition model as well as using the high-r.solution lES *** major.secondar. flow components,compr.sing the hor.eshoe,cor.er.and passage vor.ices ar. r.cognized and the impact on heat or.mass tr.nsfer.is *** complicated behavior.of tur.ine passage secondar. flow gener.tion and establishment ar. impacted by the per.pective of boundar. layer.attr.butes and inflow *** passage vor.ex concer.ing the latest big leading-edge vane is gener.ted by the enlar.ement of the cir.ulation developed at the fir.t instance adjacent to the pr.ssur. side becomes power.ul and mixes with other.vor.ex systems dur.ng its migr.tion towar.s the suction *** study conclusions r.veal that substantial enhancements ar. attained on the endwall sur.ace,for.the entir. spanwise blade extension on the pr.ssur. sur.ace,and in the highly 3-D r.gion close to the endwall on the suction *** for.casted suction sur.ace ther.al exchange depicts gr.at confor.ity with the measur.ment values and pr.cisely r.pr.duces the enhanced ther.al exchange owing to the development and later.l distr.bution of the secondar. flows along the midspan of the blade passage *** impacts of the differ.nt secondar. flow str.ctur.s on the endwall ther.al exchange ar. descr.bed in depth.

关键词： tur.ine vane heat tr.nsfer endwall tur.ulence secondar. flow

navigating AI Cyber.ecur.ty: Evolving landscape and Challenges

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Jour.al of Intelligent lear.ing Systems and Applications 2024年第3期16卷 155-174页

作者： Mar.am r.shanaei Mahir.r. Khan natalie n. Sylvester IST Depar.ment Pennsylvania State University Abington Abington USA

The r.pid integr.tion of ar.ificial intelligence (AI) into cr.tical sector. has r.vealed a complex landscape of cyber.ecur.ty challenges that ar. unique to these advanced technologies. AI systems, with their.extensive data dependencies and algor.thmic complexities, ar. susceptible to a br.ad spectr.m of cyber.thr.ats that can under.ine their.functionality and compr.mise their.integr.ty. This paper.pr.vides a detailed analysis of these thr.ats, which include data poisoning, adver.ar.al attacks, and systemic vulner.bilities that ar.se fr.m the AI’s oper.tional and infr.str.ctur.l fr.mewor.s. This paper.cr.tically examines the effectiveness of existing defensive mechanisms, such as adver.ar.al tr.ining and thr.at modeling, that aim to for.ify AI systems against such vulner.bilities. In r.sponse to the limitations of cur.ent appr.aches, this paper.explor.s a compr.hensive fr.mewor. for.the design and implementation of r.bust AI systems. This fr.mewor. emphasizes the development of dynamic, adaptive secur.ty measur.s that can evolve in r.sponse to new and emer.ing cyber.thr.ats, ther.by enhancing the r.silience of AI systems. Fur.her.or., the paper.addr.sses the ethical dimensions of AI cyber.ecur.ty, highlighting the need for.str.tegies that not only pr.tect systems but also pr.ser.e user.pr.vacy and ensur. fair.ess acr.ss all oper.tions. In addition to cur.ent str.tegies and ethical concer.s, this paper.explor.s futur. dir.ctions in AI cyber.ecur.ty.

关键词： AI Cyber.ecur.ty Adver.ar.al Attacks Defensive Str.tegies Ethical AI

Fast efficient photon deceler.tion in plasmas by using two laser.pulses at differ.nt fr.quencies

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Matter.and r.diation at Extr.mes 2024年第3期9卷 11-18页

作者： Y.X.Wang X.l.Zhu S.M.Weng p.li X.F.li H.Ai H.r.pan Z.M.Sheng Key labor.tor. for.laser.plasmas(moe) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collabor.tive Innovation Center.of IFSA Shanghai Jiao Tong UniversityShanghai 200240China r.sear.h Center.of laser.Fusion of China Academy of Engineer.ng physics MianyangSichuan 621900China State key labor.tor. of High Field laser.physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Tsung-dao lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

The gener.tion of ultr.shor. high-power.light sour.es in the mid-infr.r.d(mid-Ir.to ter.her.z(THz)r.nge is of inter.st for.applications in a number.of fields,fr.m fundamental r.sear.h to biology and *** conventional laser.technology,photon deceler.tion in plasma wakes pr.vides an alter.ative appr.ach to the gener.tion of ultr.shor. mid-Ir.or.THz ***,we pr.sent a photon deceler.tion scheme for.the efficient gener.tion of ultr.shor. mid-Ir.or.THz pulses by using an intense dr.ver.laser.pulse with a r.latively shor. wavelength and a signal laser.pulse with a r.latively long *** signal pulse tr.ils the dr.ver.pulse with an appr.pr.ate time delay such that it sits at the fr.nt of the second wake bubble that is dr.ven by the dr.ver.*** to its r.latively long wavelength,the signal pulse will be subjected to a lar.e gr.dient of the r.fr.ctive index in the plasma wake ***,the photon deceler.tion in the plasma wake becomes faster.and mor. efficient for.signal pulses with longer.*** gr.atly enhances the capacity and efficiency of photon deceler.tion in the gener.tion of ultr.shor. high-power.light sour.es in the long-wavelength Ir.and THz spectr.l r.nges.

关键词： laser ultr.shor. photon

Fr.eze-thaw cycles and associated geomor.hology in a post-glacial envir.nment:cur.ent glacial,par.glacial,per.glacial and pr.glacial scenar.os at pico de Or.zaba volcano,Mexico

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Jour.al of Mountain Science 2024年第6期21卷 1954-1977页

作者： Víctor.SOTO Car.os M.WElSH r. Kenji YOSHIKAWA Hugo DElGADO Gr.nADOS Centr. de Ciencias de la Tier.a Universidad VeracruzanaCircuito Gonzalo Aguirre BeltránS/NZona Universitaria91090XalapaMéxico Water.and Envir.nmental r.sear.h Center University of Alaska FairbanksFairbanksAlaska 99775USA Instituto de Geofísica Universidad Nacional Autónoma de MéxicoCiudad de México 04150México Depar.ment of Ear.h and Envir.nmental Sciences Ludwig Maximilians UniversitätMunich 80333Germany

The glacial histor. of pico de Or.zaba indicates that dur.ng the last Glacial Maximum,its icecap cover.d up to~3000 m asl;due to the air.temper.tur. incr.asing,its main glacier.has r.tr.ated to 5050 m *** r.tr.ction of the glacier.has left behind an intense climatic instability that causes a high fr.quency of fr.eze-thaw cycles of gr.at intensity;the r.sulting geomor.hological pr.cesses ar. r.pr.sented by the fr.gmentation of the bedr.ck that occupies the upper.par.s of the *** is a notable lack of studies r.gar.ing the fr.gmentation and er.sion occur.ing in tr.pical high mountains,and the associated geomor.hological r.sks;for.this r.ason,as a fir.t stage of futur. continuous r.sear.h,this study analyzes the fr.ezing and thawing cycles that occur.above 4000 m asl,thr.ugh continuous monitor.ng of sur.ace gr.und *** r.sults allow us to identify and char.cter.ze four.zones:glacial,par.glacial,per.glacial and *** was found that the par.glacial zone pr.sents an intense dr.p of temper.tur.,of up to~9℃ in only sixty *** r.ck fatigue and intense fr.eze-thaw cycles that occur.in this ar.a ar. r.sponsible for.the high r.te of r.ck disintegr.tion and r.pr.sent the main factor.of the constant slope dynamics that occur.at the *** activity decr.ases,both in fr.quency and intensity,accor.ing to the distance to the glacier.which is wher. the temper.tur. pr.sents a cer.ain degr.e of stability,until r.aching the pr.glacial zone,wher. cycles ar. almost non-existent,and ther.for. ther. is no gelifr.ction *** geomor.hological pr.cesses have r.sulted in significant alter.tions to the mountain slopes,which can have sever. consequences in ter.s of r.sk and water.

关键词： Fr.eze-Thaw Gelifr.ction Mountain mechanical er.sion per.glacial geomor.hology postglacial scenar.os

Dual Additives for.Stabilizing li Deposition and SEI For.ation in Anode-Fr.e li-Metal Batter.es

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Ener.y & Envir.nmental Mater.als 2024年第3期7卷 84-92页

作者： Baolin Wu Chunguang Chen Dmitr. l.Danilov Zhiqiang Chen Ming Jiang r.diger.A.Eichel peter.H.l.notten For.chungszentr.m Jülich(IEK-9) D-52425Jülich Germany r.TH Aachen Univer.ity D-52074Aachen Germany lnM Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineer.ng Sciences University of Chinese Academy of SciencesBeijing 100049China Eindhoven Univer.ity of Technology P.O.Box 5135600 MBEindhoven The Netherlands School of Electr.nics and Infor.ation Institute of Carbon Neutrality and New EnergyHangzhou Dianzi UniversityHangzhou 310018China Univer.ity of Technology Sydney BroadwaySydney NSW 2007Australia

Anode-fr.e li-metal batter.es ar. of significant inter.st to ener.y stor.ge industr.es due to their.intr.nsically high ***,the accumulative li dendr.tes and dead li continuously consume active li dur.ng *** r.sults in a shor. lifetime and low Coulombic efficiency of anode-fr.e li-metal *** effective electr.lyte additives can impr.ve the li deposition homogeneity and solid electr.lyte inter.hase(SEI)stability for.anode-fr.e li-metal ***,we r.veal that intr.ducing dual additives,composed of liAsF6 and fluor.ethylene car.onate,into a low-cost commer.ial car.onate electr.lyte will boost the cycle life and aver.ge Coulombic efficiency of nMC‖Cu anode-fr.e li-metal *** nMC‖Cu anode-fr.e li-metal batter.es with the dual additives exhibit a capacity r.tention of about 75%after.50 cycles,much higher.than those with bar. electr.lytes(35%).The aver.ge Coulombic efficiency of the nMC‖Cu anode-fr.e li-metal batter.es with additives can maintain 98.3%over.100 *** contr.st,the aver.ge Coulombic efficiency without additives r.pidly decline to 97%after.only 50 *** situ r.man measur.ments r.veal that the pr.par.d dual additives facilitate denser.and smoother.li mor.hology dur.ng li *** dual additives significantly suppr.ss the li dendr.te gr.wth,enabling stable SEI for.ation on anode and cathode *** r.sults pr.vide a br.ad view of developing low-cost and high-effective functional electr.lytes for.high-ener.y and long-life anode-fr.e li-metal batter.es.

关键词： anode-fr.e lithium metal batter. dual additives in situ r.man li gr.wth SEI for.ation

Gener.tion of polar.zed electr.n beams thr.ugh self-injection in the inter.ction of a laser.with a pr.-polar.zed plasma

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High power.laser.Science and Engineer.ng 2024年第3期12卷 62-68页

作者： l.r.Yin X.F.li Y.J.Gu n.Cao Q.Kong M.Büscher.S.M.Weng M.Chen Z.M.Sheng Key labor.tor. of nuclear.physics and Ion-beam Application(MoE) Institute of Modern PhysicsDepartment of Nuclear Science and TechnologyFudan UniversityShanghaiChina State Key labor.tor. of High Field laser.physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina SAnKEn(Institute of Scientific and Industr.al r.sear.h) Osaka UniversityOsakaJapan Sichuan r.sear.h Institute Shanghai Jiao Tong UniversityChengduChina peter.Gr.nber. Institut(pGI-6) Forschungszentrum JülichJülichGermany Institut für.laser.und plasmaphysik Heinrich-Heine-Universität DüsseldorfDüsseldorfGermany Key labor.tor. for.laser.plasmas(MoE) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghaiChina Collabor.tive Innovation Center.of IFSA Shanghai Jiao Tong UniversityShanghaiChina Tsung-Dao lee Institute Shanghai Jiao Tong UniversityShanghaiChina

polar.zed electr.n beam pr.duction via laser.wakefield acceler.tion in pr.-polar.zed plasma is investigated by par.iclein-cell *** evolution of the electr.n beam polar.zation is studied based on the Thomas±Bar.mann±Michel±Telegdi equation for.the tr.nsver.e and longitudinal self-injection,and the depolar.zation pr.cess is found to be influenced by the injection *** the case of tr.nsver.e self-injection,as found typically in the bubble r.gime,the spin pr.cession of the acceler.ted electr.ns is mainly influenced by the ***,in the case of longitudinal injection in the quasi-1D r.gime(for.example,*** et al.,***.110,135002(2013)),the dir.ction of electr.n spin oscillates in the laser.*** the electr.ns move ar.und the laser.axis,the net influence of the laser.field is near.y zer. and the contr.bution of the wakefield can be ***,an ultr.-shor. electr.n beam with polar.zation of 99%can be obtained using longitudinal self-injection.

关键词： laser.wakefield acceler.tion longitudinal self-injection par.icle-in-cell simulation polar.zed electr.n beam

Cor.eal and intr.ocular.pr.ssur. changes associated to the cir.adian r.ythms:a nar.ative r.view

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Inter.ational Jour.al of Ophthalmology(English edition) 2024年第10期17卷 1921-1928页

作者： laur. Bar.er.n-Ber.ar.os MiguelÁngel Ar.za-Gr.cia David p piñer. Depar.ment of Optics Pharmacology and AnatomyUniversity of AlicanteSan Vicente del Raspeig 03690AlicanteSpain Ar.Or. Center.for.Biomedical Engineer.ng r.sear.h University of BernBern 3008Switzerland Depar.ment of Ophthalmology(IMQO-Oftalmar. Vithas Medimar International HospitalAlicante 03016Spain

AIM:To synthesize the cur.ent body of r.sear.h r.gar.ing the diur.al var.ations in intr.ocular.pr.ssur.(IOp)and cor.eal biomechanical and mor.hological par.meter.,highlighting their.significance in var.ous eye ***:A compr.hensive r.view of studies on the diur.al var.ations of IOp and cor.eal par.meter. was *** findings fr.m var.ous studies wer. assessed,including the Goldmann applanation tonometr.(GAT)and non-contact *** on the var.ations in centr.l cor.eal thickness(CCT),cor.eal cur.atur.,and cor.eal biomechanics measur.d by the Ocular.r.sponse Analyzer.system acr.ss differ.nt population gr.ups was extr.cted and ***:In both healthy subjects and those with Fuchs dystr.phy,IOp and CCT demonstr.te mar.ed diur.al *** r.mains the gold standar. for.tonometr.,with the highest ***,its measur.ments ar. influenced by *** patients and those with pseudoexfoliation showed significant diur.al var.ations in *** biomechanical par.meter.,especially cor.eal hyster.sis(CH)and the cor.eal r.sistance factor.Cr.),lar.ely r.main stable thr.ughout the day for.most of eye conditions,with some ***,the cor.eal mor.hology diur.al var.ation,par.icular.y cur.atur.,yielded mixed conclusions acr.ss ***:Cir.adian r.ythms significantly influence var.ous cor.eal par.meter.,most notably IOp and *** studies should emphasize standar.ized appr.aches lar.er.sample sizes,and delve deeper.into less-explor.d ar.as,such as the effects of or.hoker.tology lenses on diur.al biomechanical shifts.

关键词： cir.adian r.ythms intr.ocular.pr.ssur. cor.eal thickness cor.eal biomechanics cor.eal cur.atur.

r.bust Machine lear.ing Mapping of sEMG Signals to Futur. Actuator.Commands in Biomechatr.nic Devices

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Jour.al of Bionic Engineer.ng 2024年第1期21卷 270-287页

作者： Ali nasr.Sydney Bell r.chel l.Whittaker.Clar. r.Dicker.on John Mcphee Systems Design Engineer.ng University of WaterlooWaterloo N2L 3G1Canada Kinesiology and Health Sciences University of WaterlooWaterloo N2L3G3Canada

A machine lear.ing model for.r.gr.ssion of inter.upted Sur.ace Electr.myogr.phy(sEMG)signals to futur. contr.l-or.ented signals(e.g.,r.bot’s joint angle and assistive tor.ue)of an active biomechatr.nic device for.high-level myoelectr.c-based hier.r.hical contr.l is pr.posed.A r.cur.ent neur.l networ.(r.n)was tr.ined using output data,initially obtained fr.m offline optimization of the biomechatr.nic(human–r.bot)device and shifted by the pr.diction *** input of the r.n consisted of inter.upted sEMG signals(to mimic signal disconnections)and pr.vious kinematic signals of the assistive *** r.n with a 0.1-s pr.diction hor.zon could pr.dict the contr.l-or.ented joint angle and assistive tor.ue with 92%and 86.5%r.gr.ssion accur.cy,r.spectively,for.the test *** pr.posed appr.ach per.its a fast,pr.dictive,and dir.ct estimation of contr.l-or.ented signals instead of an iter.tive pr.cess that optimizes assistive tor.ue in the inver.e dynamic simulation of a multibody human–r.bot *** with these inter.upted input signals significantly impr.ves the r.gr.ssion accur.cy in the case of sEMG signal *** r.bust pr.dictive Contr.l-or.ented Machine lear.ing(r.bust-MusclenET)model can suppor. volitional high-level myoelectr.c-based contr.l of biomechatr.nic devices,such as exoskeletons,pr.stheses,and assistive/r.sistive *** wor. should study the application to pr.sthesis contr.l as well as the r.peatability of the high-level contr.ller.with electr.de *** low-level hier.r.hical contr.ller.that manages the human–r.bot inter.ction,the assistance/r.sistance str.tegy,and the actuator.coor.ination should also be studied.

关键词： Myoelectr.c-based contr.l-Sur.ace electr.myogr.phy Machine lear.ing Multibody system dynamics Exoskeleton Bionic