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Nonlinear.dynam.c m.deling of planar.m.ving Tim.shenko beam.consider.ng non-r.gid non-elastic axial effects

Applied m.them.tics and m.chanics(English Edition) 2024年第3期45卷 479-496页

作者： m.ABBASI GAVAr. m.r.HOm.EINEZHAD Faculty of m.chanical Engineer.ng K.N.Toosi University of TechnologyTehran 19991-43344Iran

Due to the im.or.ance of vibr.tion effects on the functional accur.cy of m.chanical system.,this r.sear.h aim. to develop a pr.cise m.del of a nonlinear.y vibr.ting single-link m.bile flexible *** m.nipulator.consists of an elastic ar.0}a r.tar. m.tor.and a r.gid car.ier.and under.oes gener.l in-plane r.gid body m.tion along with elastic tr.nsver.e *** accur.tely m.del the elastic behavior.Tim.shenko’s beam.theor. is used to descr.be the flexible ar.0}which accounts for.r.tar. iner.ia and shear.defor.0}tion *** applying Newton’s second law,the nonlinear.gover.ing equations of m.tion for.the m.nipulator.ar. der.ved as a coupled system.of or.inar. differ.ntial equations(ODEs)and par.ial differ.ntial equations(PDEs).Then,the assum.d m.de m.thod(Am.)is used to solve this nonlinear.system.of gover.ing equations with appr.pr.ate shape *** assum.d m.des can be obtained after.solving the char.cter.stic equation of a Tim.shenko beam.with clam.ed boundar. conditions at one end and an attached m.ss/iner.ia at the *** addition,the effect of the tr.nsver.e vibr.tion of the inextensible ar.0}on its axial behavior.is *** the axial r.gidity,the effect m.kes the r.gid body dynam.cs invalid for.the axial behavior.of the ***,num.r.cal sim.lations ar. conducted to evaluate the per.or.0}nce of the developed m.del,and the r.sults ar. com.ar.d with those obtained by the finite elem.nt *** com.ar.son confir.0} the validity of the pr.posed dynam.c m.del for.the *** to the m.ntioned featur.s,this m.del can be r.liable for.investigating the system.s vibr.tional behavior.and im.lem.nting vibr.tion contr.l algor.thm..

关键词： planar.m.ving Tim.shenko beam non-r.gid non-elastic axial effect as-sum.d m.de m.thod(Am.) nonlinear.m.tion analysis

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HVSr.analysis of pum.ce sands for.sedim.nt depth char.cter.zation:A case study for.Guadalajar.,m.xico

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Ear.hquake Engineer.ng and Engineer.ng Vibr.tion 2024年第3期23卷 577-591页

作者： Hafid Salgado m. Alejandr. r.m.r.z-Gaytan Adolfo Pr.ciado Chr.stian r.Escuder. Depar.am.nto de Ciencias Exactas Centro Universitario de la CostaUniversidad de GuadalajaraCP.48280 Puerto VallartaJaliscoMéxico Depar.am.nto de Ciencias Com.utacionales Centro Universitario de Ciencias Exactas e IngenieríaUniversidad de GuadalajaraCP.44430 GuadalajaraJaliscoMéxico Depar.am.nto del Hábitat y Desar.ollo Ur.ano Instituto Tecnológico y de Estudios Superiores de Occidente(ITESO)CP.45604 TlaquepaqueMéxico

The hor.zontal to ver.ical spectr.l r.tio(HVSr.m.thodology is used her. to char.cter.ze pum.ce soils and to im.ge the thr.e-dim.nsional sur.ace geom.tr. of Guadalajar.,*** to other.Latin Am.r.can cities,Guadalajar. is exposed to high seism.c r.sk,with the par.icular.ty of being the lar.est ur.an settlem.nt in Latin Am.r.ca built on pum.ce *** has not yet been tested to char.cter.ze subsoil depths in pum.ce *** to the questionable use of tr.ditional geotechnical tests for.the analysis of pum.ce soils,HVSr.pr.vides an alter.ative for.its char.cter.zation without alter.ng its fr.gile and por.us *** this wor.,r.sonance fr.quency(F0)and peak am.litude(A0)ar. used to constr.in the depth of the m.jor.im.edance contr.st that r.pr.sents the inter.ace between bedr.ck and pum.ce *** wer. com.ar.d with bor.hole depths and other.available geotechnical and geophysical data and show good *** of the pr.files estim.ted on the r.ver.anks that cr.ss the city,r.veals differ.nt subsoil thickness that could have an im.act on differ.nt site r.sponses on r.ver.ne ar.as to an eventual *** and academ.c effor.s ar. com.ined in this wor. to char.cter.ze depth sedim.nts,an im.or.ant par.m.ter.that im.acts the r.gulations for.constr.ction in the city.

关键词： subsoil of Guadalajar. shallow soil thickness bedr.ck depth pum.ce soil char.cter.zation

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Fr.eze-thaw cycles and associated geom.r.hology in a post-glacial envir.nm.nt:cur.ent glacial,par.glacial,per.glacial and pr.glacial scenar.os at Pico de Or.zaba volcano,m.xico

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Jour.al of m.untain 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.nm.ntal r.sear.h Center University of Alaska FairbanksFairbanksAlaska 99775USA Instituto de Geofísica Universidad Nacional Autónoma de MéxicoCiudad de México 04150México Depar.m.nt of Ear.h and Envir.nm.ntal Sciences Ludwig Maximilians UniversitätMunich 80333Germany

The glacial histor. of Pico de Or.zaba indicates that dur.ng the Last Glacial m.xim.m.its icecap cover.d up to~3000 m.asl;due to the air.tem.er.tur. incr.asing,its m.in glacier.has r.tr.ated to 5050 m.*** r.tr.ction of the glacier.has left behind an intense clim.tic instability that causes a high fr.quency of fr.eze-thaw cycles of gr.at intensity;the r.sulting geom.r.hological pr.cesses ar. r.pr.sented by the fr.gm.ntation of the bedr.ck that occupies the upper.par.s of the *** is a notable lack of studies r.gar.ing the fr.gm.ntation and er.sion occur.ing in tr.pical high m.untains,and the associated geom.r.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 m.nitor.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 tem.er.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 m.in factor.of the constant slope dynam.cs 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 tem.er.tur. pr.sents a cer.ain degr.e of stability,until r.aching the pr.glacial zone,wher. cycles ar. alm.st non-existent,and ther.for. ther. is no gelifr.ction *** geom.r.hological pr.cesses have r.sulted in significant alter.tions to the m.untain slopes,which can have sever. consequences in ter.0} of r.sk and water.

关键词： Fr.eze-Thaw Gelifr.ction m.untain m.chanical er.sion Per.glacial geom.r.hology Postglacial scenar.os

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Pile foundation in alter.ate layer.d liquefiable and non-liquefiable soil deposits subjected to ear.hquake loading

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Ear.hquake Engineer.ng and Engineer.ng Vibr.tion 2024年第2期23卷 359-376页

作者： Pr.veen Huded m.Sur.sh r.Dash LEA Associates South East Asia Pvt.Ltd. New Delhi 110044India Indian Institute of Technology Bhubaneswar Khurda 752050India

Pile foundations ar. still the pr.fer.ed foundation system.for.high-r.se str.ctur.s in ear.hquake-pr.ne *** foundations have exper.enced failur.s in past ear.hquakes due to *** on pile foundations in liquefiable soils has pr.m.r.ly focused on the pile foundation behavior.in two or.thr.e-layer.d soil ***,in natur.l occur.ence,it m.y occur.in alter.ative layer. of liquefiable and non-liquefiable ***,the exper.m.ntal and/or.num.r.cal studies on the layer.d effect on pile foundations have not been widely addr.ssed in the *** of the design codes acr.ss the wor.d do not explicitly m.ntion the effect of sandwiched non-liquefiable soil layer. on the pile *** the pr.sent study,the behavior.of an end-bear.ng pile in layer.d liquefiable and non-liquefiable soil deposit is studied *** study found that the kinem.tic bending m.m.nt is higher.and gover.s the design when the effect of the sandwiched non-liquefied layer.is consider.d in the analysis as opposed to when its effect is ***,ignor.ng the effect of the sandwiched non-liquefied layer.in a liquefiable soil deposit m.ght be a nonconser.ative design appr.ach.

关键词： pile foundation liquefaction alter.ately layer.d soil fixity effect layer.d effect

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Facile synthesis of sam.r.um.and cer.um.doped double per.vskite cobaltite with enhanced dielectr.c r.sponse

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Jour.al of r.r. Ear.hs 2024年第7期42卷 1317-1327,I0005页

作者： Yasir.Abbas m.Kam.an m.Anis-ur.r.hm.n Applied Ther.0}l Physics Labor.tor. Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investigation of Sm.Ce doping on str.ctur.,conduction,and dielectr.c r.sponse of Bi_(2)Ca_(2-2x)Sm.(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCSCCO)ar. *** the specim.ns wer. synthesized by a facile synthesis technique nam.d the co-pr.cipitation r.ute.X-r.y diffr.ction(Xr.)r.veals that BCSCCO cr.stallizes into one phase with space gr.up P21/*** cr.stallite size,dislocation density,lattice par.m.ter.,lattice str.in,unit cell volum.,and bulk density wer. deter.0}ned using Xr. *** str.ctur.l pr.per.ies of Bi_(2)Ca_(2)CoO_(6)wer. exam.ned using calculations based on the density functional *** and exper.m.ntal values discr.pancy is less than 1%.A scanning electr.n m.cr.scope was used for.per.or.0}ng a m.cr.str.ctur.l *** SEm.im.ges dem.nstr.te the hom.geneous distr.bution of gr.ins with a r.nge of sizes(0.054-0.090μm..The alter.ating cur.ent(ac)conductivity,dielectr.c per.0}ttivity,and tangent loss wer. also studied as a function of fr.quency(20 Hz-3 m.z)at differ.nt tem.er.tur.s(100-500℃).All synthesized sam.les wer. exam.ned using non-linear.Debye's function to deter.0}ne their.spr.ading factor.and r.laxation *** specim.n with the lowest cr.stallite size(∼23 nm.exhibits a high dielectr.c per.0}ttivity(∼3.80×10^(6)).The conduction m.chanism.was exam.ned in the studied sam.les with the use of Jonscher.s power.*** power.law indicates that the BCSCCO(x=0.000,0.025)follows cor.elated bar.ier.hopping,wher.as the x=0.050 and 0.075 com.ositions follow non-over.apping polar.n *** studied specim.n Bi_(2)Ca_(1.9)0Sm.(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm.(3))displays a high electr.cal conductivity(∼46.1 S/cm..These findings cor.espond to those published for.cer.m.cs m.de fr.m.calcium.cobaltite using solid-state r.actions(5.0-26.0 S/cm..

关键词： Bism.th calcium.sam.r.um.cer.um.cobaltite (BCSCCO) Spr.ading factor Conduction m.chanism r.r. ear.hs

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Contr.l system.design for.a pr.ssur.-tube-type super.r.tical water.cooled nuclear.r.actor.via a higher.or.er.sliding m.de m.thod

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Nuclear.Science and Techniques 2024年第1期35卷 145-154页

作者： m.Hajipour.G.r.Ansar.far Depar.m.nt of Nuclear.Engineer.ng Faculty of PhysicsUniversity of IsfahanIsfahan 81746-73441Iran

Nuclear.power.plants exhibit non-linear.and tim.-var.able ***,designing a contr.l system.that sets the r.actor.power.and for.es it to follow the desir.d load is com.licated.A super.r.tical water.r.actor.SCWr.is a four.h-gener.tion conceptual *** an SCWr.the non-linear.dynam.cs of the r.actor.r.quir. a contr.ller.capable of contr.l-ling the *** this study,a pr.ssur.-tube-type SCWr.was contr.lled dur.ng r.actor.power.m.neuver.ng with a higher.or.er.sliding m.de,and the r.actor.outgoing steam.tem.er.tur. and pr.ssur. wer. contr.lled *** an SCWr.the tem.er.tur.,pr.ssur.,and power.m.st be m.intained at a setpoint(desir.d value)dur.ng power.*** point kinetics equations with thr.e gr.ups of delayed neutr.ns wer. used in the ***-or.er.and classic sliding m.de contr.ller. wer. separ.tely m.nufactur.d to contr.l the plant and wer. com.ar.d with the PI contr.ller. speci-fied in pr.vious *** contr.lled par.m.ter. wer. r.actor.power.steam.tem.er.tur.,and ***,for.these par.m.ter.,the PI contr.ller.had cer.ain instabilities in the pr.sence of *** classic sliding m.de contr.ller.had a higher.accur.cy and stability;however.its m.in dr.wback was the chatter.ng *** was highly accur.te and stable and had a sm.ll com.utational *** r.ality,it followed the desir.d values without oscillations and chatter.ng.

关键词： Super.r.tical water.nuclear.r.actor Higher.or.er.sliding m.de contr.ller Steam.tem.er.tur. Steam.pr.ssur. Point kinetics m.del

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Kinem.tic analysis of flexible bipedal r.botic system.

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Applied m.them.tics and m.chanics(English Edition) 2024年第5期45卷 795-818页

作者： r.FAZEL A.m.SHAFEI S.r.NEKOO Depar.m.nt of m.chanical Engineer.ng Shahid Bahonar University of KermanKerman ***Iran Depar.am.nto de Ingenier.a de Sistem.s y Autom.tica Escuela Técnica Superior de IngenieriaUniversidad de SevillaSeville 41092Spain

In spite of its intr.nsic com.lexities,the passive gait of bipedal r.bots on a sloping r.m. is a subject of inter.st for.num.r.us *** distinguishes the pr.sent r.sear.h fr.m.sim.lar.wor.s is the consider.tion of flexibility in the constituent links of this type of r.botic *** is not a far.fetched assum.tion because in the tr.nsient(im.act)phase,due to the im.ulsive for.es which ar. applied to the system.the likelihood of exciting the vibr.tion m.des incr.ases ***,the hum.n leg bones that ar. involved in walking ar. suppor.ed by viscoelastic m.scles and ***,for.achieving m.r. exact r.sults,it is essential to m.del the r.bot links with viscoelastic *** this end,the Gibbs-Appell for.0}lation and Newton's kinem.tic im.act law ar. used to der.ve the m.st gener.l for.0}of the system.s dynam.c equations in the swing and tr.nsient phases of *** m.st im.or.ant issue in the passive walking m.tion of bipedal r.bots is the deter.0}nation of the initial r.bot configur.tion with which the system.could accom.lish a per.odic and stable gait solely under.the effect of gr.vitational *** extr.m.ly unstable natur. of the system.studied in this paper.and the vibr.tions caused by the im.ulsive for.es induced by the im.act of r.bot feet with the inclined sur.ace ar. som. of the ver. ser.ous challenges encounter.d for.achieving the above-m.ntioned *** over.om. such challenges,an innovative m.thod that uses a com.ination of the linear.zed equations of m.tion in the swing phase and the algebr.ic m.tion equations in the tr.nsition phase is pr.sented in this paper.to obtain an eigenvalue *** solving this pr.blem.the suitable initial conditions that ar. necessar. for.the passive gait of this bipedal r.bot on a sloping sur.ace ar. *** effects of the char.cter.stic par.m.ter. of elastic links including the m.dulus of elasticity and the Kelvin-Voigt coefficient on the walking stability of this type of

关键词： bipedal r.bot flexible link swing phase tr.nsient phase eigenvalue pr.blem Kelvin-Voigt coefficient

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Enhancem.nt of coer.ivity,per.0}ability,and dielectr.c pr.per.ies of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) fer.ites for.m.m.r. and high fr.quency devices

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Jour.al of r.r. Ear.hs 2024年第6期42卷 1128-1135,I0005页

作者： I.Sar.ar.m.D.Hossain m.S.Sikder.m.N.I.Khan m.r.r.hm.n Physics Discipline Khulna UniversityKhulna9208Bangladesh Depar.m.nt of Physics Khulna University of Engineering&TechnologyKhulna9203Bangladesh Depar.m.nt ofCom.uter.Science and Engineer.ng Northern University of Business&Technology KhulnaKhulna9100Bangladesh m.ter.al Science Division Atomic Energy CentreDhaka1000Bangladesh

Spinel cubic fer.ites have huge applications in m. m.r. and high fr.quency *** the im.r.vem.nt of these m.der. devices,the m.gnetic coer.ivity,per.0}ability,and dielectr.c pr.per.ies of a fer.ite ar. the im.or.ant *** ar.icle focuses on im.r.ving the m.gnetic coer.ivity,m.gnetic per.0}ability,and dielectr.c pr.per.ies of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) fer.ites,wher. x=0.00,0.06,and *** X-r.y diffr.ction(Xr.),Four.er.tr.nsfor.0}infr.r.d spectr.scopy(FTIr.,field em.ssion scanning electr.n m.cr.scopy(FESEm.,ener.y disper.ive X-r.y(EDX),vibr.ting sam.le m.gnetom.ter.VSm.,and an im.edance analyzer.wer. used to char.cter.ze the str.ctur.l,m.gnetic,and dielectr.c pr.per.ies of the *** Xr. patter.s indicate the for.0}tion of spinel cubic str.ctur. of the sam.les with a secondar. peak(EuFeO_(3))for.Eu doped *** densities and por.sities of the sam.les follow an inver.e tr.nd,wher. the doped sam.les’lattice par.m.ter. ar. incr.ased with the incr.m.nt of r.r. ear.h Eu *** FTIr.analysis also pr.ves the spinel cubic phase of the *** aver.ge gr.in size of the fer.ites is obtained via FESEm.im.ges,and it is incr.ased fr.m.121 to 198 *** analysis confir.0} that doping of the Eu content also changes other.hyster.sis loop pr.per.ies of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ***,the coer.ivity of the Eu doped sam.les is gr.ater.than that of the m.ther.alloy(x=0.00).The EDX study shows that ther. is no im.ur.ty contam.nation in the *** per.0}ability and dielectr.c m.asur.m.nts show an im.r.ved quality factor.of the Eu-doped sam.les with low m.gnetic and dielectr.c *** dependent r.sistivity and im.edance analysis also show the im.r.ved *** the obser.ed pr.per.ies of the sam.les,all the investigated fer.ites m.ght be str.ng candidates for.potential applications in m.m.r. devices,m.gnetic sensor.,and high fr.quency applications.

关键词： Fer.ites r.r.e ar.hs Coer.ivity Per.0}ability EDX r.sistivity

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Par.m.tr.c investigation on the novel and cost-effective nano fly ash im.r.gnated geopolym.r.system.for.sustainable constr.ction

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Fr.ntier. of Str.ctur.l and Civil Engineer.ng 2024年第2期18卷 170-183页

作者： r.m.HANA S.m.Leela BHAr.THI Depar.m.nt of Civil Engineer.ng Mepco Schlenk Engineering CollegeSivakasi 626123India

The hazar.ous envir.nm.ntal effects of gr.enhouse gas em.ssions and clim.te change dem.nd alter.ative sour.es for.cem.ntitious m.ter.als in the constr.ction *** developm.nt of geopolym.r.str.ctur.s pr.vides a way of pr.ducing 100%cem.nt-fr.e *** this r.sear.h wor.,a novel and sim.le way of der.ving nano par.icles fr.m.waste fly ash par.icles is *** effect of adding the synthesized nano fly ash par.icles as a filler.m.dium.in geopolym.r.m.r.ar. was investigated by consider.ng str.ngth and dur.bility *** optim.zation was done by using r.gr.ssion analysis on the geopolym.r.m.r.ar.and the im.act of adding nano fly ash par.icles was studied by var.ing differ.nt per.entages of addition r.nging fr.m.0 to 7.5%by weight of binder.*** the r.sults,it was obser.ed that 1%nano fly ash acted not only as a filler.but also as nano-sized pr.cur.or. of the polym.r.zation pr.cess,r.sulting in denser.geopolym.r.*** can explain the extr.or.inar. gain in str.ngth of 72.11 m.a as well as the denser.cor. with negligible level of chlor.de ion penetr.tion,m.king the m.ter.al suitable for.the developm.nt of str.ctur.s susceptible to m.r.ne envir.nm.nt.

关键词： geopolym.r nano fly ash chlor.de ion penetr.tion dur.bility polym.r.zation filler.

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Cooper.tive Tar.et Fencing of m.ltiple Vehicles for.a Gener.l Tar.et with Connectivity Pr.ser.ation and Collision Avoidance

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Jour.al of System. Science & Com.lexity 2024年第1期37卷 136-151页

作者： PAN Zini CHEN Ben m Depar.m.nt of m.chanical and Autom.tion Engineer.ng The Chinese University of Hong KongHong KongChina

In this paper.the author. study the cooper.tive tar.et-fencing pr.blem.for.n-dim.nsional system. and a tar.et with a gener.l *** using the velocity of the vehicles,a position feedback contr.l law is pr.posed to fence the gener.l tar.et into the convex hull for.0}d by the ***,the dynam.cs of each vehicle is descr.bed by a double-integr.tor.*** potential functions ar. designed to guar.ntee connectivity pr.ser.ation of the com.unication networ. and collision avoidance am.ng the *** pr.posed appr.ach can deal with a tar.et whose tr.jector. is any twice continuously differ.ntiable function of *** effectiveness of the r.sult is ver.fied by a num.r.cal exam.le.

关键词： m.lti-agent system. networ.ed system. tar.et fencing

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