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Influence of the Molecular Weight on PVA/Go Composite Membranes for Fuel Cell Applications

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Journal of Renewable Materials 2020年第9期8卷 1171-1180页

作者： C.González-Guisasola o.gil-castell R.Teruel-Juanes A.Ribes-Greus Instituto de Tecnología de Materiales(ITM) Universitat Politècnica de ValènciaValencia46022Spain Departament d’Enginyeria Química Universitat de ValènciaBurjassot46100Spain

Composite polymer electrolyte membranes were prepared with poly(vinyl alcohol)(PVA).Two different molecular weight(Mw),67·103 and 130·103 g·mol−1 were selected,cross-linked with sulfosuccinic acid(SSA)and doped graphene oxide(Go).The effects on the membranes obtained from these polymers were characterized in order to evaluate the fuel cell *** microscopy showed a proper nanoparticle distribution in the polymer *** chemical structure was evaluated by Fourier transform infrared *** absence of a crystalline structure and the enhancement on the thermal stability with the addition of 1%of Go was demonstrated by thermal *** transference number and protonic conductivity were correlated to the performance of a hydrogen fuel ***,a power increase in the composite membranes with lower molecular weight was *** polymer chains may improve protonic conductivity and consequently the fuel cell performance.

关键词： Fuel cell graphene oxide polarization poly(vinyl alcohol) polyelectrolyte

Functionalised Poly(Vinyl Alcohol)/Graphene oxide as Polymer Composite Electrolyte Membranes

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Journal of Renewable Materials 2019年第7期7卷 655-665页

作者： o.gil-castell R.Cerveró R.Teruel-Juanes J.D.Badia A.Ribes-Greus Instituto de Tecnología de Materiales(ITM) Universitat Politècnica de València(UPV)Camino de Vera s/nValenciaSpain Departament d’Enginyeria Química Escola Tècnica Superior d’EnginyeriaUniversitat de València(UV)Av.de la Universitat s/nBurjassotSpain

Crosslinked poly(vinyl alcohol)(PVA)based composite films were prepared as polyelectrolyte membranes for low temperature direct ethanol fuel cells(DEFC).The membranes were functionalised by means of the addition of graphene oxide(Go)and sulfonated graphene oxide(SGo)and crosslinked with sulfosuccinic acid(SSA).The chemical structure was corroborated and suitable thermal properties were *** the addition of Go and SGo slightly decreased the proton conductivity of the membranes,a significant reduction of the ethanol solution swelling and crossover was encountered,more relevant for those functionalised with *** general,the composite membranes were stable under simulated service *** addition of Go and SGo particles permitted to buffer the loss and almost retain similar proton conductivity than prior to *** membranes are alternative polyelectrolytes,which overcome current concerns of actual commercial membranes such as the high cost or the crossover phenomenon.

关键词： Direct ethanol fuel cell graphene oxide poly(vinyl alcohol) proton exchange membranes proton conductivity

Blood biomarkers of Alzheimer’s disease:important considerations for use in clinical practice

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Neural Regeneration Research 2025年第1期20卷 205-206页

作者： Sarah Fullam Sean o’Dowd Antoinette o’Connor Department of Neurology Tallaght University HospitalDublinIreland Academic Unit of Neurology Trinity College DublinIreland

Introduction:Fluid and positron emission tomography(PET)biomarkers that enable the detection of the hallmark proteins of Alzheimer’s disease(AD)(amyloid and tau)have revolutionized our approach to the diagnosis of *** evolution of AD diagnostic criteria to include biological characterization(Alzheimer’s Association Working Group,2023)provides an appropriate framework to reduce levels of clinico-pathologic mismatch and improve in-vivo diagnostic *** the therapeutic landscape for neurodegenerative disease evolves,it is increasingly incumbent on clinicians to provide timely,and pathologically precise diagnoses for ***,the expensive and invasive nature of these tests limits their scalability.

关键词： Blood Alzheimer diagnosis

Dynamic stress concentration in an infinitely long cylindrical cavity due to a point spherical source embedded within a fluid-saturated poroelastic formation of infinite extent

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 139-156页

作者： H.HoSSEINI o.BALILASHAKI Department of Mechanical Engineering Faculty of EngineeringGolestan University

The effects of a harmonically exciting monopole source on an infinitely long cylindrical cavity embedded entirely within a fluid-saturated poroelastic formation of infinite extent are examined theoretically. It is assumed that the source is located outside the cavity at a specified distance from the borehole axis. The magnitudes of the hoop and radial stresses beside the pore pressures exerted on the interface and inside the porous medium surrounding the borehole are calculated and discussed. Biot's poroelastic modeling along with three types of boundary conditions for the cylindrical interface including the ideal fluid, empty borehole, and rigid inclusion with a hard boundary is employed for the analysis. Utilizing a proper translational addition theorem for expressing the incident spherical wave in terms of cylindrical wave expansions, the proposed boundary conditions at the interface are satisfied. Stresses are formulated by means of wave potential functions in a three-dimensional(3D) manner. The effects of the frequency and the radial distance between the source and borehole on the induced stresses are examined for the first cylindrical modes over frequency spectra. Two permeability conditions for the interface and three types of soils for the porous formation are considered throughout the analysis. To give an overall outline of the study, a numerical example is presented. The results clearly indicate that the distance is a key parameter and has considerable effects on the induced stress values. In addition, the interface permeability condition and soil characteristics play an important role in determining the dynamic response of the borehole. Finally,the obtained results are compared with the relevant analyses existing in the literature for some limit cases, and good agreement is achieved.

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Neuroinflammation revisited through the microglial lens

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Neural Regeneration Research 2025年第7期20卷 1989-1990页

作者： Renato Socodato João B.Relvas Institute of Research and Innovation in Health(i3S)and Institute for Molecular and Cell Biology(IBMC) University of PortoPortoPortugal Department of Biomedicine Faculty of Medicine of the University of Porto(FMUP)PortoPortugal

Neuroimmunology is emerging as a pivotal field,shedding light on the intricate dialogues between the central nervous system(CNS)and the immune *** exploration is particularly significant in understanding microglia,the CNS’s innate immune cells,beyond the conventional conflation of“neuroinflammation”and“microglial activation.”This conflation has clouded the true complexity of these processes,potentially stalling scientific progress and the development of new *** challenge the long-standing perspectives that have oversimplified these interactions,advocating for a deeper exploration of the dynamic relationship between neuroinflammation and microglial *** dissecting specific molecular pathways,we aim to illuminate their elaborate roles in neuroinflammatory responses,especially in the context of Alzheimer’s disease(AD).Here,neuroinflammation is not merely a passive observer or a direct antagonist but a complex agent in the disease’s *** article calls for a significant paradigm shift towards an integrative,multi-omics approach to *** such a comprehensive framework is crucial for advancing our understanding of neuroinflammatory conditions and paving the way for targeted therapeutic strategies for brain diseases.

关键词： inflammation simplified activation

Contribution of mechanical forces to structural synaptic plasticity:insights from 3D cellular motility mechanisms

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Neural Regeneration Research 2025年第7期20卷 1995-1996页

作者： Rita o.Teodoro Mafalda Ribeiro Ramos Lara Carvalho iNoVA4Health NOVA Medical School|Faculdade de Ciências MédicasNMS|FCMUniversidade Nova de LisboaLisboaPortugal

Cells,tissues,and organs are constantly subjected to the action of mechanical forces from the extracellular environment-and the nervous system is no ***-intrinsic properties such as membrane lipid composition,abundance of mechanosensors,and cytoskeletal dynamics make cells more or less likely to sense these *** and extrinsic cues are integrated by cells and this combined information determines the rate and dynamics of membrane protrusion growth or retraction(Yamada and Sixt,2019).Cell protrusions are extensions of the plasma membrane that play crucial roles in diverse contexts such as cell migration and neuronal synapse *** the nervous system,neurons are highly dynamic cells that can change the size and number of their pre-and postsynaptic elements(called synaptic boutons and dendritic spines,respectively),in response to changes in the levels of synaptic activity through a process called *** plasticity is a hallmark of the nervous system and is present throughout our lives,being required for functions like memory formation or the learning of new motor skills(Minegishi et al.,2023;Pillai and Franze,2024).

关键词： plasticity structural mechanisms

Apples to oranges:environmentally derived,dynamic regulation of serotonin neuron subpopulations in adulthood?

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Neural Regeneration Research 2025年第9期20卷 2596-2597页

作者： Christopher J.o’Connell Matthew J.Robson Department of Genetics College of MedicineHarvard UniversityBostonMAUSA James L.Winkle College of Pharmacy Division of Pharmaceutical SciencesUniversity of CincinnatiCincinnatiOHUSA Neuroscience Graduate Program College of MedicineUniversity of CincinnatiCincinnatiOHUSA

Traumatic brain injury(TBI)is a public health problem with an undue economic burden that impacts nearly every age,ethnic,and gender group across the globe(Capizzi et al.,2020).TBIs are often sustained during a dynamic range of exposures to energetic environmental forces and as such outcomes are typically heterogeneous regarding severity and pathology(Capizzi et al.,2020).

关键词： sustained orange dynamic

Re-evaluation of Rostraria bierii Tokioka,1970(Annelida)from Seto,Japan as a magelonid,with a review of the Magelonidae of the western Pacific

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Acta oceanologica Sinica 2022年第3期41卷 61-69页

作者： Mortimer Kate Mills Kimberley gil Joao Department of Natural Sciences Amgueddfa Cymru-National Museum WalesCathays ParkCardiff CF103NPWalesUK School of Earth and Environmental Sciences Cardiff UniversityCardiff CF103ATWalesUK Centre of Marine Sciences(CCMAR) University of AlgarveCampus de GambelasFaro 8005-139Portugal

The identity of Rostraria bierii,originally described as a larval amphinomid from Cape Setozaki,Pacific coast of Japan,is *** on the original description and illustrations,reinterpretations conclude the“larva”to represent a partial juvenile or adult magelonid specimen,broken after the first *** original figures are compared with several known magelonid species to justify the new *** authors suggest the supposed amphinomid larva is a Magelonidae taxon *** identity of the species is discussed in line with the current knowledge of the Magelonidae in the western Pacific and a key to all known species within the region is provided to aid *** gaps in our taxonomic knowledge of the Magelonidae of the western Pacific are highlighted and discussed.

关键词： Polychaeta Amphinomida Magelonidae Magelona octomagelona western Pacific identification key Cape Setozaki

PERTURBATIoNS oF ZERoS oF SoLUTIoNS To SECoND oRDER DIFFERENTIAL EQUATIoNS WITH PoLYNoMIAL CoEFFICIENTS

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Acta Mathematica Scientia 2012年第3期32卷 1083-1092页

作者： Michael gil' Department of Mathematics Ben Gurion University of the NegevP.O.Box 653Beer-Sheva 84105Israel

Let P（z） and P（z） be polynomials of the same degree. We consider the equations u＂ = P（z）u and u＂ = P（z）u （z ∈ C） whose solutions are u（z） and u（z）, respectively. Let Zk（U） and zk（u）, k = 1, 2,..., be the zeros of u（z） and u（z）, respectively. We derive bounds for the quantity sup j inf k｜1/zk（u）-1/zj（u）｜

关键词： Complex differential equation zeros of solutions perturbation of zeros