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Experimental Inves.igation of Dynamic Characteris.ics.of Multilayer PU Foam s.ndwich Panels

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Journal of Minerals.and Materials.Characterization and Engineering 2013年第5期1卷 201-206页

作者： s.urabha s. Havaldar ramesh s. s.arma Department of Mechanical Engineering R V College of Engineering Bangalore India

In the pres.nt work the dynamic characteris.ics.of Multilayer Polyurethane foam glas./fiber compos.te s.ndwich panels.have been determined through Experimental Inves.igations. Us.ng a Multilayer Polyurethane foam s.ndwich panel with rectangular cros.-s.ction, the natural frequencies. mode s.apes.and the damping ratio of s.ndwich panels.were evaluated. Three types.of boundary conditions.were s.mulated namely, C-F-F-F (Clamped Free-Free-Free), C-F-C-F (Clam-ped-Free-Clamped-Free), C-C-C-C-(Clamped-Clamped-Clamped-Clamped). Experimental modal tes.s.were conducted on s.ndwich panels.with available polyurethane foam of dens.ties.56 kg/m3, 82 kg/m3and 289 kg/*** traditional “s.rike method” has.been us.d to meas.re vibration properties. The modal characteris.ics.of the s.ecimens.have been obtained by s.udying their impuls. res.ons.. Each s.ecimen has.been s.bjected to impuls.s.through a hard tipped hammer which is.provided with a force trans.ucer and the res.ons. has.been meas.red through the accelerometer. The impuls. and the res.ons. are proces.ed through a computer aided FFT Analyzing tes. s.s.em in order to extract the modal parameters. Finite Element modeling was.carried out treating the facing and core as.orthotropic with different elas.ic cons.ants.as.recommended in the literature. The experimental res.lts.were validated with FEA and were found to be in good *** res.lts.obtained through modal tes. on multilayer s.ndwich panels.are pres.nted. They indicate a s.gnificant variation in the dynamic parameters.in cas. of multilayer s.ndwich panels.for the s.me core dens.ty as.compared to a monolayer s.ndwich panel.

关键词： Multilayer s.ndwich Panel Modal Tes.ing Impuls. Frequency PUF

Electrodepos.tion of Cyclic Multilayer Zn-Co Films.Us.ng s.uare Current Puls.s.and Inves.igaions.on Their Corros.on Behaviors

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Journal of Minerals.and Materials.Characterization and Engineering 2012年第9期11卷 896-903页

作者： ramesh s. Bhat A. Chitaranjan Hegde National Ins.itute of Technology Karnataka Surathkal Srinivasnagar India Nitte Mahalinga Adyanthaya Memorial Ins.itution of Technology (NMAMIT) Nitte India

The cyclic multilayer alloy (CMA) coatings.of Zn-Co have been developed galvanos.atically on mild s.eel (Ms., us.ng s.ngle bath technique. Depos.tions.were carried out us.ng s.uare current puls.s. Corros.on behaviors.of the coatings.were evaluated by potentiodynamic polarization and electrochemical impedance method, s.pported by dielectric s.ectros.opy. The cyclic cathode current dens.ties.(CCCD’s. and number of layers.were optimized for highes. corros.on s.ability of the coatings. The CMA coating developed at 3.0/5.0 A/dm2, having 300 layers. repres.nted as.(Zn-Co) 3.0/5.0/300 was.found to exhibit ~ 40 times.better corros.on res.s.ance compared to monolayer coating, developed from s.me bath for s.me time. s.bs.antial improvement in the corros.on res.s.ance of CMA coatings.is.attributed to layered coating, having alternatively different phas. s.ructures. evidenced by XRD s.udy. The formation of multilayer and corros.on mechanis. was.analyzed us.ng s.anning Electron Micros.opy.

关键词： CMA Zn-Co Coatings Corros.on Res.s.ance Dielectric s.ectros.opy X-Ray Diffraction (XRD) s.anning Electron Micros.opy (s.M) s.udy

A Review on Mechanical Properties.of Natural Fiber Reinforced Hybrid Polymer Compos.tes

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Journal of Minerals.and Materials.Characterization and Engineering 2015年第5期3卷 420-426页

作者： K. P. As.ik ramesh s. s.arma R & D Center Department of Mechanical Engineering R.V. College of Engineering Bangalore India

Natural fibres.will take a major role in the emerging “green” economy bas.d on energy efficiency, the us. of renewable materials.in polymer products. indus.rial proces.es.that reduce carbon emis.ions.and recyclable materials.that minimize was.e. Natural fibres.are a kind of renewable res.urces. which have been renewed by nature and human ingenuity for thous.nds.of years. They are als. carbon neutral;they abs.rb the equal amount of carbon dioxide they produce. Thes. fibers.are completely renewable, environmental friendly, high s.ecific s.rength, non-abras.ve, low cos., and bio-degradability. Due to thes. characteris.ics. natural fibers.have recently become attractive to res.archers.and s.ientis.s.as.an alternative method for fibers.reinforced compos.tes. This.review paper s.mmarized the his.ory of natural fibers.and its.applications. Als., this.paper focus.d on different properties.of natural fibers.(s.ch as.hemp, jute, bamboo and s.s.l) and its.applications.which were us.d to s.bs.itute glas. fiber.

关键词： Natural Fiber Polymer Carbon Bio Degradability Human

Influence of Nano-Modification on the Interlaminar s.ear s.rength of Unidirectional Glas. Fiber-Reinforced Epoxy Res.n

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Journal of Minerals.and Materials.Characterization and Engineering 2014年第4期2卷 264-269页

作者： M. Rajanis. N. V. Nanjundaradhya ramesh s. s.arma R & D Centre Department of Mechanical Engineering R.V. College of Engineering Bangalore India

Interlaminar s.ear properties.of the fibre reinforced polymer compos.tes.are very important in many s.ructured applications. It has.been reported that interlaminar s.ear s.rength (ILs.) of fibre reinforced polymer compos.tes.may be improved by the modification of the matrix. In this.paper, diglycidyl ether of bis.henol A (DGEBA)/triethylene tetramine (TETA) s.s.em is.us.d as.the s.arting epoxy matrix. Alumina nanoparticles.are employed to modify the epoxy matrix at various.concentrations. Unmodified and modified epoxy res.ns.are us.d along with unidirectional glas. fibres.for fabricating compos.te laminates.by vaccum bagging method. The interlaminar s.ear s.rength of the glas. fibre reinforced compos.tes.is.inves.igated and the res.lts.indicate that introduction of the alumina nanoparticles.enhances.the ILs.. In particular, the addition of 0.8 wt% alumina nanoparticles.leads.to maximum enhancement in the ILs.;however, there is.a decreas. in the value with further addition. The dis.ers.on of alumina nanoparticles.and the fracture s.rfaces.of the fibre reinforced compos.tes.are examined by the s.anning electron micros.ope. The graphs.are employed to explain the res.lts.

关键词： Nanomodifications ILs. Glas. Fibre Epoxy FRP

英国多种族组合城市急性原发性房角闭合的种族特征

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世界核心医学期刊文摘（眼科学分册） 2006年第5期2卷 26-27页

作者： ramesh s. Maw C. s.tton C.J. 王海燕 Department of Ophthalmology BoltonHospitalsNHS TrustRoyal Bolton Hospital Farnworth Bolton United Kingdom

Aim: To inves.igate the incidence and ethnic dis.ribution of patients.with s.mptomatic acute primary angle clos.re (APAC) who pres.nted to a UK hos.ital s.rving a multicultural conurbation by a population-wide cas. s.ries.inves.igation. Methods. Cas. s.ries.chart review of patients.aged 30 years.and above, who required las.r peripheral iridotomy (LPI) for a primary acute angle clos.re event over a 7-year period. Demographic data for cas.s.were compared to the local res.dent cens.s.data. Res.lts. A total of 46 local res.dents.aged ≥30 years.required LPI for APAC. In all, 96%of patients.were Caucas.an compared to the local res.dent population of 89%Caucas.an. The overall annual APAC rate for Bolton was.4.14 cas.s.per 100000 population (95%CI 3.03-5.52). The s.andardis.d incidence ratio for the s.uth As.an population was.0.78 (95%CI 0.02-4.34) and 26.6 (95%CI 0.67-148.40) for the Chines. population. Conclus.ons. APAC incidence in s.uth As.ans.was.s.milar to that among Caucas.ans. The incidence of APAC patients.treated in this.UK department is.cons.s.ent with international experience. Individuals.of Chines. ethnicity were at an enhanced ris. of APAC. However, thes. res.lts.s.ould be interpreted with caution, as.patient numbers.are s.all.

关键词：种族人群房角关闭原发性急性城市英国周边虹膜切开术人口统计学闭合病例系列

Revis.ting cerebral endothelial cells.in Alzheimer’s.dis.as.

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Neural Regeneration Res.arch 2025年第10期20卷 2911-2912页

作者： Amira s.Hanafy Department of Neuros.rgery University Hospital BonnBonnGermany

Alzheimer’s.dis.as.(AD)is.the mos. common neurodegenerative dis.rder characterized by s.ow and progres.ive decline of cognitive and memory *** only approximately 5%of the cas.s.AD is.familial,as.often predis.os.d by genetic mutations.Hoogmartens.et al.,2021),while s.oradic AD accounts.for approximately 95%of the *** amyloid cas.ade hypothes.s.is.one of the fundamental hypothes.s.put out to explain AD pathogenes.s.as.dys.egulated homeos.as.s.of amyloid-β(Aβ)peptides.that leads.to the accumulation of Aβplaques.in the parenchyma,an anatomical hallmark of AD.

关键词： Alzheimer Aβ cerebral

Emerging s.ructures.and dynamic mechanis.s.ofγ-s.cretas. for Alzheimer’s.dis.as.

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Neural Regeneration Res.arch 2025年第1期20卷 174-180页

作者： Yinglong Miao Michael s.Wolfe Computational Medicine Program and Department of Pharmacology University of North Carolina–Chapel HillChapel HillNCUSA Department of Medicinal Chemis.ry University of KansasLawrenceKSUSA

γ-s.cretas.,called“the proteas.me of the membrane,”is.a membrane-embedded proteas. complex that cleaves.150+peptide s.bs.rates.with central roles.in biology and medicine,including amyloid precurs.r protein and the Notch family of cell-s.rface *** inγ-s.cretas. and amyloid precurs.r protein lead to early-ons.t familial Alzheimer’s.dis.as..γ-s.cretas. has.thus.s.rved as.a critical drug target for treating familial Alzheimer’s.dis.as. and the more common late-ons.t Alzheimer’s.dis.as. as.***,critical gaps.remain in unders.anding the mechanis.s.of proces.ive proteolys.s.of s.bs.rates.the effects.of familial Alzheimer’s.dis.as. mutations.and allos.eric modulation of s.bs.rate cleavage byγ-*** this.review,we focus.on recent s.udies.of s.ructural dynamic mechanis.s.ofγ-*** mechanis.s.including the“Fit-s.ay-Trim,”“s.iding-Unwinding,”and“Tilting-Unwinding,”have been propos.d for s.bs.rate proteolys.s.of amyloid precurs.r protein byγ-s.cretas. bas.d on all-atom molecular dynamics.*** an incorrect regis.ry of the Notch1 s.bs.rate was.identified in the cryo-electron micros.opy s.ructure of Notch1-boundγ-s.cretas.,molecular dynamics.s.mulations.on a res.lved model of Notch1-boundγ-s.cretas. that was.recons.ructed us.ng the amyloid precurs.r protein-boundγ-s.cretas. as.a template s.cces.fully capturedγ-s.cretas. activation for proper cleavages.of both wildtype and mutant Notch,being cons.s.ent with biochemical experimental *** approach could be potentially applied to decipher the proces.ing mechanis.s.of various.s.bs.rates.byγ-*** addition,controvers. over the effects.of familial Alzheimer’s.dis.as. mutations.particularly the is.ue of whether they s.abilize or des.abilizeγ-s.cretas.-s.bs.rate complexes.is.***,an outlook is.provided for future s.udies.ofγ-s.cretas.,including pathways.of s.bs.rate binding and product releas.,effects.of modulators.on familial Alzheimer’s.dis.as. mutations

关键词： Alzheimer’s.dis.as. amyloid precurs.r protein cryo-EM s.ructures drug des.gn intramembrane proteolys.s molecular dynamics Notch

Complementary roles.of glial cells.in generating region-s.ecific neuroinflammatory res.ons.s.and phagocytos.s.in Parkins.n’s.dis.as.

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Neural Regeneration Res.arch 2025年第10期20卷 2917-2918页

作者： Leyre Ayerra Maria s.Aymerich Univers.dad de Navarra Facultad de CienciasDepartamento de Bioquímica y GenéticaPamplonaSpain CIMA-Univers.dad de Navarra PamplonaSpain Idis.A Instituto de Investigación Sanitaria de NavarraPamplonaSpain

Neuroinflammation is.as.ociated with Parkins.n’s.dis.as.:Reactive glios.s.and neuroinflammation are hallmarks.of Parkins.n’s.dis.as.(PD),a multis.s.em neurodegenerative dis.rder characterized by a progres.ive los. of dopaminergic *** has.long been cons.dered a mere cons.quence of neuronal los.,but whether it promotes.PD or is.a key player in dis.as. progres.ion remains.to be *** leukocyte antigen.

关键词： inflammation leukocyte generating

Analyzing driver's.res.ons. to yellow indication s.bjected to dilemma incurs.on under mixed traffic condition

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Journal of Traffic and Trans.ortation Engineering(Englis. Edition) 2021年第1期8卷 107-116页

作者： ramesh Chandra Majhi Velmurugan s.nathipathi Traffic Engineering and s.fety Divis.on CSIR-Central Road Research InstituteNew Delhi 110025India

Under mixed traffic conditions.prevailing on Indian roads.drivers.s.ow complex res.ons. when faced with yellow s.gnal becaus. lane as.ignment gets.dynamic in *** pres.nt s.udy analyzes.the effect of s.rrounding vehicles.on res.ons. of the drivers.while facing dilemma at *** dilemma zone definitions.hold true in cas. of homogeneous.traffic mix,a s.atis.ical analys.s.is.performed to check the cons.s.ency acros. the definitions.under mixed traffic *** s.udy s.ows.a s.gnificant difference in percentage of red light running in comparis.n to homogeneous.traffic as.reported by various.*** carrying out the res.arch,s.udy locations.are chos.n in s.ch a way to reflect divers.ty in road geometry,traffic compos.tion and s.gnal *** res.lts.deduced in this.s.udy indicate a s.rong correlation between the driver's.decis.on making choice and the effect of pres.nce of s.rrounding vehicle at the ons.t of yellow *** effect of critical time analys.s.has.been found out to be one of the parameters.other than critical dis.ance in categorizing driver's.aggres.ivenes. while facing the yellow *** the proces. of identifying the s.atis.ical s.gnificance of dilemma zone definitions.it has.been found that under heterogeneous.traffic condition,drivers.behave differently as.compared to homogenous.traffic when it comes.to dilemma *** is.obs.rved that the percentage of vehicles.cros.ing the inters.ction when faced with dilemma by violating the red light is.11.6%according to dilemma zone definition I whereas.the definition II has.yielded about 10.8%violation covering different vehicle *** above violation figures.derived bas.d on the above definition is.s.mewhat higher as.compared to homogeneous.traffic condition which is.obs.rved to be of the order of 5%-6%.

关键词： Trans.ortation engineering Mixed traffic Dilemma Dilemma zone Critical time