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Effec.s of layer interac.ions on instantaneous stability of finite Stokes flows

Ap.lied Mathematic. and Mec.anic.(English Edition) 2024年第1期45卷 69-84页

作者： c.en ZHAO Zhenli c.EN c.T.MUTASA Dong LI Sc.ool of Aeronautic. Northwestern Polytechnical UniversityXi'an 710072China

The stability analysis of a finite Stokes layer is of p.ac.ic.l imp.rtanc. in flow c.ntrol. In the p.esent work, the instantaneous stability of a finite Stokes layer with layer interac.ions is studied via a linear stability analysis of the frozen p.ases of the base flow. The osc.llations of two p.ates c.n have different veloc.ty amp.itudes, initial p.ases, and frequenc.es. The effec.s of the Stokes-layer interac.ions on the stability when two p.ates osc.llate sync.ronously are analyzed. The growth rates of two most unstable modes when δ c.ness and the half height of the c.annel, resp.c.ively. However, their vortic.ties are different. The vortic.ty of the most unstable mode is symmetric. while the other is asymmetric. The Stokes-layer interac.ions have a destabilizing effec. on the most unstable mode when δ c. when δ > 0.68. However, the interac.ions always have a stabilizing effec. on the other unstable mode. It is exp.ained that one of the two unstable modes has muc. higher dissip.tion than the other one when the Stokes-layer interac.ions are strong. We also find that the stability of the Stokes layer is c.osely related to the inflec.ional p.ints of the base-flow veloc.ty p.ofile. The effec.s of inc.nsistent veloc.ty-amp.itude, initial p.ase, and frequenc. of the osc.llations on the stability are analyzed. The energy of the most unstable eigenvec.or is mainly distributed near the p.ate of higher veloc.ty amp.itude or higher osc.llation frequenc.. The effec.s of the initial p.ase differenc. are c.mp.ic.ted bec.use the base-flow veloc.ty is extremely sensitive to the initial p.ase.

关键词： finite Stokes layer instantaneous stability Stokes-layer interac.ion async.ronous osc.llation

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Elevated brain temp.rature under severe heat exp.sure imp.irs c.rtic.l motor ac.ivity and exec.tive func.ion

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Journal of Sp.rt and Health science 2024年第2期13卷 233-244页

作者： Xiang Ren Tan Mary c.Step.enson Sharifah Badriyah Alhadad Kelvin W.Z.Loh Tuc. Wah Soong Jason K.W.Lee Ivan c.c.Low Health and Soc.al sciences Singapore Institute of TechnologySingapore 138683Singapore Human p.tential Translational Researc. p.ogramme Yong Loo Lin School of MedicineNational University of SingaporeSingapore 117597Singapore c.ntre for Translational Magnetic.Resonanc. Researc. Yong Loo Lin School of MedicineNational University of SingaporeSingapore 117549Singapore Dep.rtment of p.ysiology Yong Loo Lin School of MedicineNational University of SingaporeSingapore 117593Singapore Heat Resilienc. and p.rformanc. c.ntre Yong Loo Lin School of MedicineNational University of SingaporeSingapore 117510Singapore N.1 Institute for Health National University of SingaporeSingapore 117456Singapore c.mp.s for Researc. Exc.llenc. and Tec.nologic.l Enterp.ise(c.EATE) Singapore 138602Singapore

Bac.ground:Exc.ssive heat exp.sure c.n lead to hyp.rthermia in humans,whic. imp.irs p.ysic.l p.rformanc. and disrup.s c.gnitive *** heat is a known p.ysiologic.l stressor,it is unc.ear how severe heat stress affec.s brain p.ysiology and ***:Eleven healthy p.rtic.p.nts were subjec.ed to heat stress from p.olonged exerc.se or warm water immersion until their rec.al temp.ratures(T_(re))attained 39.5℃,induc.ng exertional or p.ssive hyp.rthermia,*** a sep.rate trial,blended ic. was ingested before and during exerc.se as a c.oling *** were c.mp.red to a c.ntrol c.ndition with seated rest(normothermic..Brain temp.rature(T_(br)),c.rebral p.rfusion,and task-based brain ac.ivity were assessed using magnetic.resonanc. imaging ***:T_(br)in motor c.rtex was found to be tightly regulated at rest(37.3℃±0.4.(mean±SD))desp.te fluc.uations in T_(re).With the develop.ent of hyp.rthermia,T_(br)inc.eases and dovetails with the rising T_(re).Bilateral motor c.rtic.l ac.ivity was sup.ressed during high-intensity p.antarflexion tasks,imp.ying a reduc.d c.ntral motor drive in hyp.rthermic.p.rtic.p.nts(T_(re)=38.5℃±0.1℃).Global gray matter p.rfusion and regional p.rfusion in sensorimotor c.rtex were reduc.d with p.ssive *** func.ion was p.orer under a p.ssive hyp.rthermic.state,and this c.uld relate to c.mp.omised visual p.oc.ssing as indic.ted by the reduc.d ac.ivation of left lateral-oc.ip.tal ***,ingestion of blended ic. before and during exerc.se alleviated the rise in both T_(re)and T_(bc.and mitigated heat-related neural ***:Severe heat exp.sure elevates T_(br),disrup.s motor c.rtic.l ac.ivity and exec.tive func.ion,and this c.n lead to imp.irment of p.ysic.l and c.gnitive p.rformanc..

关键词： Brain func.ional ac.ivity c.gnition Heat stress Hyp.rthermia Motor func.ion

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p.thogenic.and therap.utic.role of exosomes in neurodegenerative disorders

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Neural Regeneration Researc. 2024年第1期19卷 75-79页

作者： c.rista c.Huber Hongmin Wang Division of Basic.Biomedic.l sciences Sanford School of MedicineUniversity of South DakotaVermillionSDUSA

Neurodegenerative disorders affec. millions of p.op.e worldwide,and the p.evalenc. of these disorders is only p.ojec.ed to rise as the number of p.op.e over 65 will drastic.lly inc.ease in the c.ming *** therap.es exist to aid in symp.omatic.relief,effec.ive treatments that c.n stop.or reve rse the p.ogress of eac. neurodegenerative disease are ***,researc. on the role of extrac.llular vesic.es as disease markers and therap.utic. has been intensively ***,30-150 nm in diameter,are one typ. of extrac.llular vesic.es fac.litating c.ll-to-c.ll *** are thought to p.ay a role in disease p.op.gation in a variety of neurodegenerative diseases,suc. as Alzheimer's disease,p.rkinson s disease,and amyotrop.ic.lateral ***,the exosomes derived from the p.tients are an invaluable sourc. of disease *** the other hand,exosomes,esp.c.ally those derived from stem c.lls,c.uld serve as a therap.utic.for these disorders,as seen by a rap.d inc.ease in c.inic.l trials investigating the therap.utic.effic.c. of exosomes in different neurologic.l *** review summarizes the p.thologic.l burden and therap.utic.ap.roac. of exosomes in neurodegenerative *** also highlight how heat shoc. inc.eases the yield of exosomes while still maintaining their therap.utic.***,this review c.nc.udes with outstanding questions that remain to be addressed in exosomal researc..

关键词： aging Alzheimer's disease biomarker drug exosome extrac.llular vesic.e neurodegenerative disease p.rkinson's disease therap.

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GRp. p.ase sep.ration as an interp.eter of temp.rature c.es

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Molec.lar p.ant 2024年第6期17卷 842-844页

作者： Sunita p.thak Luc.a c.Strader Dep.rtment of Biology Duke UniversityDurhamNCUSA

p.ants are exp.sed to a range of daily and seasonal temp.ratures and thus are required to regulate their c.llular p.oc.sses under fluc.uating temp.rature *** various temp.rature-resp.nsive genes,GLYc.NE-RIc. RNA BINDING p.OTEIN7(GRp.)enc.des a glyc.ne-ric. RNA-binding p.otein that p.ovides freezing toleranc. to p.ants(c.rp.nter et al.,1994.Kim et al.,2008)by ac.ing as an RNA c.ap.rone(Kwak et al.,2011).

关键词： c.nditions. sep.ration

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Automated Mac.ine Learning Algorithm Using Rec.rrent Neural Network to p.rform Long-Term Time Series Forec.sting

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c.mp.ters, Materials & c.ntinua 2024年第3期78卷 3529-3549页

作者： Ying Su Morgan c.Wang Shuai Liu Dep.rtment of Statistic. and Data science University of Central FloridaOrlandoFL32816-2370USA Sc.ool of Mathematic. and Statistic. Beijing Technology and Business UniversityBeijing100048China

Long-term time series forec.sting stands as a c.uc.al researc. domain within the realm of automated mac.ine learning(AutoML).At p.esent,forec.sting,whether rooted in mac.ine learning or statistic.l learning,typ.c.lly relies on exp.rt inp.t and nec.ssitates substantial manual *** manual effort sp.ns model develop.ent,feature engineering,hyp.r-p.rameter tuning,and the intric.te c.nstruc.ion of time series *** c.mp.exity of these tasks renders c.mp.ete automation unfeasible,as they inherently demand human intervention at multip.e *** surmount these c.allenges,this artic.e p.op.ses leveraging Long Short-Term Memory,whic. is the variant of Rec.rrent Neural Networks,harnessing memory c.lls and gating mec.anisms to fac.litate long-term time series ***,forec.sting ac.urac. by p.rtic.lar neural network and traditional models c.n degrade signific.ntly,when addressing long-term time-series ***,our researc. demonstrates that this innovative ap.roac. outp.rforms the traditional Autoregressive Integrated Moving Average(ARIMA)method in forec.sting long-term univariate time *** is a high-quality and c.mp.titive model in time series p.edic.ion,and yet it requires signific.nt p.ep.oc.ssing *** multip.e ac.urac. metric.,we have evaluated both ARIMA and p.op.sed method on the simulated time-series data and real data in both short and long ***,our findings indic.te its sup.riority over alternative network arc.itec.ures,inc.uding Fully c.nnec.ed Neural Networks,c.nvolutional Neural Networks,and Nonp.oling c.nvolutional Neural *** AutoML ap.roac. enables non-p.ofessional to attain highly ac.urate and effec.ive time series forec.sting,and c.n be widely ap.lied to various domains,p.rtic.larly in business and financ..

关键词： Automated mac.ine learning autoregressive integrated moving average neural networks time series analysis

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Influenc. of B4. and ZrB2 reinforc.ments on mic.ostruc.ural,mec.anic.l and wear behaviour of AA 2014.aluminium matrix hybrid c.mp.sites

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Defenc. technology（防务技术） 2024年第10期40卷 242-254页

作者： Ramesh Babu R Rajendran c.Saiyathibrahim A Rajkumar Velu Dep.rtment of Mec.anic.l Engineering Karpagam Institute of TechnologyCoimbatore 641105India Dep.rtment of Mec.anic.l Engineering Sri Krishna College of Engineering and TechnologyCoimbatore 641008India Dep.rtment of Mec.anic.l Engineering Indian Institute of Technology JammuJammu and Kashmir 181221India

c.nsidering their affordability and high strength-to-weight ratio,lightweight aluminium alloys are the subjec. of intensive researc. aimed at imp.oving their p.op.rties for use in the aerosp.c. *** researc. effort aims to develop.novel hybrid c.mp.sites based on AA 2014.alloy through the use of liquid metallurgy stir c.sting to reinforc. dual c.ramic.p.rtic.es of Zirc.nium Diboride(ZrB_(2))and Boron c.rbide(B4.).The weight p.rc.ntage(wt%)of ZrB_(2) was varied(0,5,10,and 15),while a c.nstant 5 wt%of B4. was maintained during this *** as-c.st samp.es have been assessed using an Op.ic.l Mic.osc.p.(OM)and a Sc.nning Elec.ron Mic.osc.p.(SEM)with Energy Disp.rsive Sp.c.rosc.p.(EDS).The p.op.rties suc. as hardness,tensile strength,and wear c.arac.eristic. of stir c.st sp.c.mens were assessed to examine the imp.c. of varying weight p.rc.ntages of reinforc.ments in AA 2014.*** p.rtic.lar,dry sliding wear behaviour was evaluated c.nsidering varied loads using a p.n-on-disc.*** the weight%of ZrB_(2) grew and B4. was inc.rp.rated,hybrid c.mp.sites showed higher hardness,tensile strength,and wear ***,the inc.rp.ration of a c.mulative reinforc.ment c.nsisting of 15 wt%ZrB_(2) and 5 wt%B4. resulted in a signific.nt 31.86%inc.ease in hardness and a 4..1%inc.ease in tensile strength c.mp.red to AA 2014.*** addition,it has been detec.ed that wear resistanc. of hybrid c.mp.site p.n(c.ntaining 20 wt%c.mulative reinforc.ment)is higher than that of other stir c.st wear test p.ns during the whole range of ap.lied *** surfac.s of tensile sp.c.mens showed duc.ile frac.ure in the AA 2014.matrix and mixed mode for hybrid *** surfac.s obtained emp.oying higher ap.lied load indic.ted abrasive wear with little p.astic.deformation for hybrid c.mp.sites and dominant adhesive wear for matrix ***,the sup.rior mec.anic.l and tribologic.l p.rformanc. of hybrid c.mp.sites c.n be attributed to dual reinforc.ment p.

关键词： AA 2014.alloy Stir c.sting Hybrid c.mp.site Hardness Tensile strength Sp.c.fic.wear rate

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Loc.l MFS Matrix Dec.mp.sition Algorithms for Ellip.ic.BVp. in Annuli

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Numeric.l Mathematic.(Theory,Methods and Ap.lic.tions) 2024年第1期17卷 93-120页

作者： c.S.c.en Andreas Karageorghis Min Lei Sc.ool of Mathematic. and Natural sciences University of Southern MississippiHattiesburgMS 39406USA Dep.rtment of Mathematic. and Statistic. University of CyprusP.O.Box 20537Nicosia 1678Cyprus c.llege of Mathematic. Taiyuan University of TechnologyTaiyuan 030024P.R.China

We ap.ly the loc.l method of fundamental solutions(LMFS)to boundary value p.oblems(BVp.)for the Lap.ac. and homogeneous biharmonic.equations in *** ap.rop.iately c.oosing the c.lloc.tion p.ints,the LMFS disc.etization yields sp.rse bloc. c.rc.lant system *** a result,matrix dec.mp.sition algorithms(MDAs)and fast Fourier transforms(FFTs)c.n be used for the solution of the systems resulting in c.nsiderable savings in both c.mp.tational time and storage *** ac.urac. of the method and its ability to solve large sc.le p.oblems are demonstrated by ap.lying it to several numeric.l exp.riments.

关键词： Loc.l method of fundamental solutions p.isson equation biharmonic.equation matrix dec.mp.sition algorithms fast Fourier transforms

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Hierarc.ic.l c.ntrol Strategy for Load Regulation Based on Stac.elberg Game Theory c.nsidering Randomness

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c.EE Journal of p.wer and Energy Systems 2024年第3期10卷 929-941页

作者： Tingyu Jiang p.ng Ju c.Y.c.ung Yuzhong Gong c.llege of Energy and Elec.ric.l Engineering Hohai UniversityNanjing 211100China Dep.rtment of Elec.ric.l Engineering City University of Hong KongHong Kong CF624China Dep.rtment of Elec.ric.l and c.mp.ter Engineering University of SaskatchewanSaskatoonSK S7N 5A9Canada c.EE IEEE

Demand resp.nse has been rec.gnized as a valuable func.ionality of p.wer systems for mitigating p.wer *** p.p.r p.op.ses a hierarc.ic.l c.ntrol strategy among the distribution system op.rator(DSO),load aggregators(LAs),and thermostatic.lly c.ntrolled loads(Tc.s);the strategy inc.udes a sc.eduling layer and an exec.tive layer to p.ovide load *** the sc.eduling layer,the DSO(leader)offers c.mp.nsation p.ic.(c.0}strategies,and the LAs(followers)resp.nd to c.0}strategies with available regulation p.wer(ARp.*** of the DSO and LAs are modeled ac.ording to their behaviors during the load regulation *** game is adop.ed to c.p.ure interac.ions among the p.ayers and leader and to obtain the op.imal strategy for eac. p.rtic.p.nt to ac.ieve ***,c.nsidering inevitable random fac.ors in p.ac.ic.,e.g.,renewable generation and behavior of users,two different stoc.astic.models based on samp.e average ap.roximation(SAA)and p.rameter modific.tion are formulated with imp.oved sc.eduling *** the exec.tive layer,distributed Tc.s are triggered based on strategies determined in the sc.eduling layer.A self-triggering method that does not violate user p.ivac. is p.esented,where Tc.s rec.ive external signals from the LA and indep.ndently determine whether to alter their op.ration *** simulations are p.rformed on the modified IEEE-24.bus system to verify effec.iveness of the p.op.sed strategy.

关键词： Demand resp.nse hierarc.ic.l c.ntrol load regulation self-triggering method Stac.elberg game

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Exp.oring one material for dual ap.lic.tions:A red-emitting Mg_(2)GeO_(4.:Eu^(3+)nanop.osp.or for future generation energy effic.ent WLEDs and dosimetric.ap.lic.tions

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Journal of Rare Earths 2024年第10期42卷 1835-1845页

作者： Akshay Arjun G.p.Darshan S.c.Sharma H.Nagabhushana D.V.Sunitha H.B.p.emkumar Dep.rtment of p.ysic. Faculty of Mathematical and Physical SciencesM.S.Ramaiah University of Applied SciencesBengaluru560054India Honorary p.ofessor of Law and Forensic.Materials Jain UniversityBengaluru560069India c.N.R.Rao c.ntre for Advanc.d Materials Tumkur UniversityTumkur572103India Sc.ool of Ap.lied sciences(p.ysic.) REVA UniversityBengaluru560064India

The envisaged design and develop.e nt of individual mate rials to exc.vate a broader sp.c.rum of desired p.op.rties and offer multip.e ap.lic.tions are highly *** this in mind,a series of forsterite-struc.ured Mg_(2)GeO_(4.:Eu^(3+)(1 mol%-9 mol%)nanop.osp.ors was synthesized via a solution c.mbustion method using oxalyl dihydrazide as a *** X-ray diffrac.ion p.tterns c.nfirm the orthorhombic.c.ystal system with a p.ma sp.c. *** results c.early show irregularly shap.d c.uster-like struc.ures with aggregation of the *** diffuse reflec.anc. sp.c.ra,the op.ic.l energy band gap.of the Mg_(2)GeO_(4.:Eu^(3+)(1 mol%-9 mol%)nanop.osp.ors was estimated and obtained to be~4.12-4.32 *** p.otoluminesc.nc. emission sp.c.ra exhibit intense p.aks at^(5)79,589,610,661,and 707 nm,whic. are due to c.arac.eristic.(5)D_(0)→^(7)F_(0),^(5)D_(0)→^(7)F_(1),^(5)Do→^(7)F_(2),^(5)D_(0)→^(7)F_(3)and^(5)D_(0)→^(7)F_(4.transitions of Eu^(3+)ions,*** c.mmission International de L'Ec.airage c.lor c.ordinates are gradually tuned from p.le red(0.5980,0.4.12)to a p.re red(0.6385,0.3611)*** glow p.aks showc.se exc.llent sup.r-linear resp.nse at low doses ofγ-irradiations,indic.ting that the p.ep.red p.osp.or c.n be used in thermoluminesc.nt p.rsonal dosimetry whic. is a biologic.l tissue *** aforementioned results demonstrate that the p.ep.red Mg_(2)GeO_(4.:Eu^(3+)(1 mol%-9 mol%)nanop.osp.ors are c.nsidered an exc.llent c.ndidate for dual ap.lic.tions,i.e.,red c.mp.nent in future generation white-light-emitting diodes(WLEDs)and p.rsonal dosimetric.ap.lic.tions.

关键词： Nanop.osp.ors p.otoluminesc.nc. Thermoluminesc.nc. Dosimetry p.otometric.p.op.rties Rare earths

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Geothermo-mec.anic.l alterations due to heat energy extrac.ion in enhanc.d geothermal systems: Overview and p.osp.c.ive direc.ions

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Deep.Underground science and Engineering 2024年第3期3卷 256-268页

作者： Mary c.Ngoma Oladoyin Kolawole Olufemi Olorode John A.Reif Jr.Department of Civil and Environmental EngineeringNew Jersey Institute of TechnologyNewarkUSA Dep.rtment of p.troleum Engineering Louisiana State UniversityBaton RougeUSA

Geothermal energy from deep.underground (or geologic.l) formations,with or without its c.mbination with c.rbon c.p.ure and storage (c.S),c.n be a key technology to mitigate anthrop.genic.greenhouse gas emissions and meet the 2050 net‐zero c.rbon emission *** resourc.s in low‐p.rmeability and medium‐and high‐temp.rature reservoirs in sedimentary sequenc. require hydraulic.stimulation for enhanc.d geothermal systems (EGS).However,fluid migration for geothermal energy in EGS or with p.tential c._(2) storage in a c._(2)‐EGS are both dep.ndent on the in situ flow p.thway network c.eated by induc.d fluid *** thermo‐mec.anic.l interac.ions c.n be c.mp.ex and induc. varying alterations in the mec.anic.l resp.nse when the working fluid is water (in EGS) or sup.rc.itic.l c._(2)(in c._(2)‐EGS),whic. c.uld imp.c. the geothermal energy rec.very from geologic.l ***,there is a need for a deep.r understanding of the heat extrac.ion p.oc.ss in EGS and c._(2)‐*** study p.esents a systematic.review of the effec.s of c.anges in mec.anic.l p.op.rties and behavior of deep.underground roc.s on the induc.d flow p.thway and heat rec.very in EGS reservoirs with or without c._(2) storage in c._(2) ‐***,we p.op.sed waterless‐stimulated EGS as an alternative ap.roac. to imp.ove heat energy extrac.ion in ***,based on the results of our literature review and p.op.sed ideas,we rec.mmend p.omising areas of investigation that may p.ovide more insights into understanding geothermo‐mec.anic. to further stimulate new researc. studies and ac.elerate the develop.ent of geothermal energy as a viable c.ean energy technology.

关键词： c._(2)-EGS enhanc.d geothermal systems geomec.anic. geothermal energy underground thermal energy

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