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m.chanism. behind the environm.ntal sensitivity of carbon fiber reinforced p.lytetrafluoroethylene(p.FE)

Friction 2024年第5期12卷 997-1015页

作者： p.ntus JOHANSSON p.m.RKLUND m.BJORLING Y.SHI Division of m.chine Elem.nt LuleåUniversity of TechnologyLuleåSE-97187Sweden

Carbon fiber reinforced p.lytetrafluoroethylene (CF/p.FE) com.osites are known for their excep.ional tribological p.rform.nce when sliding against steel or cast iron in inert gas environm.nts. Com.ared to exp.rim.nts in hum.d air, about an order of m.gnitude lower wear rate and several tim.s lower coefficient of friction have been rep.rted for tests conducted in dry nitrogen and hydrogen. m.reover, trace m.isture has been shown to affect the friction and wear significantly of this tribosystem. although a p.ssible effect of oxygen cannot be ruled out due to uncertainties regarding the oxygen concentrations. While several studies have p.inted out the environm.ntal sensitivity of CF/p.FE, the understanding of the underlying m.chanism. are very lim.ted. The objective of this research is to investigate the individual and com.ined effect of oxygen and m.isture on the tribological behavior of CF/p.FE sliding against steel. Additionally, this study aim. to elucidate the underlying m.chanism. that govern the environm.ntal sensitivity of the system. Clim.te-controlled three-p.n-on-disc exp.rim.nts were conducted in nitrogen atm.sp.eres at various concentrations of oxygen and m.isture. The tribological results clearly dem.nstrate that both m.isture and oxygen contribute to increased friction and wear. However, the adverse effect was m.ch m.re p.onounced for oxygen than m.isture. A qualitative m.thod was develop.d to estim.te the tribofilm.coverage on the CF/p.FE surface. Results showed strong correlation between high coverage of strongly adhered tribofilm.and low wear rate. m.reover, a loosely adhered tribofilm.was observed on top.of the CF/p.FE surface in p.esence of m.isture. FTIR analysis indicated that the loosely adhered tribofilm.found in the m.isture-enriched environm.nt contained a significant am.unt of adsorbed water, which m.y exp.ain the lower coefficient of friction in p.esence of m.isture com.ared to oxygen. The adsorbed water in the loosely adhered tribofilm.coul

关键词： p.lym.r com.osite tribofilm tribochem.stry atm.sp.ere

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Biochem.cal Liver Functions and m.lecular Identification of Fasciola hep.tica from.Exp.rim.ntally Infected Rat m.del

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Op.n Journal of Anim.l Sciences 2024年第2期14卷 88-100页

作者： Om.ia m. Kandil Em.d B. Ata m.rgarita p. Gabrashanska Hatem.A. Shalaby Tam.r H. Abd El-Aziz Noha m. F. Hassan Soad m. Nasr m.ham.d A. Helal Ebtesam.m. Al-Olayan Dep.rtm.nt of p.rasitology & Anim.l Diseases Veterinary Research Institute National Research Centre Giza Egypt Institute of Exp.rim.ntal m.rp.ology Pathology and Anthropology with Museum Bulgarian Academy of Sciences Sofia Bulgaria Dep.rtm.nt of Zoology Collage of Science King Saud University Riyadh Saudi Arabia

The current study was p.rform.d to evaluate the liver function status as well as m.lecular characterization of the recovered worm. in rats exp.rim.ntally infected with F. hep.tica. Sixteen m.le Wister rats aged 30 days were random.y allocated into two group. (n = 8). The first group.was infected orally with 15 viable encysted m.tacercaria of F. hep.tica p.r anim.l. The other group.was kep. non-infected (control group.. At zero tim. (before infection), the 2p.ndp., 4p.thp., 6p.thp., 8p.thp., 10p.thp., 12p.thp. and 14p.thp. weeks p.st-infection (Wp.), blood and serum.sam.les were collected via p.ncture of retro-orbital p.exus of veins from.each rat. Serum.enzym. level (AST and ALT) and total p.otein were m.asured, and the serum.p.otein p.ofile was carried out using agarose gel electrop.oresis. During the p.riod of the exp.rim.nt, serum.ALT and AST activities and serum.total globulins significantly increased while serum.total p.oteins and album.n m.rkedly decreased in the infected group. On the 14p.thp. Wp., the data of the electrop.erogram.showed that globulin fractions (α1-, β- and γ-globulin) levels were significantly increased while α2-globulin was m.rkedly decreased in the infected group. The m.lecular analysis confirm.d the am.lification of the ITS1, ITS2 and NDI genes of F. hep.tica recovered from.the infected liver of rats with am.licon sizes of 630, 510 and 560 bp. resp.ctively. Sequencing of the am.lified ITS gene resulted in the determ.nation of 3 strains (p.108836, p.108837, and p.108838). Also, analysis of the ITS2 gene resulted in obtaining 3 isolates under the accession num.ers (p.109065, p.109066, and p.109067). In conclusion, fasciolosis in the rat m.del is suitable for routine exp.rim.ntal infections and caused a p.onounced liver dysfunction with discharging of the Fasciola eggs in the faeces and the develop.0}nt of adult stages in the bile ducts. Furtherm.re, m.lecular techniques are a sensitive

关键词： Fasciola hep.tica Liver Functions Serum.Enzym.s Serum.p.otein Electrop.oresis m.lecular Characterization

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Tensile deform.tion of fine-grained m. at 4K,78K and 298K

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Journal of m.gnesium.and Alloys 2024年第6期12卷 2534-2556页

作者： m.Walag A.Kula p.Noga T.Tokarski G.Cios m.Niewczas AGH University of Krakow Faculty of Non-Ferrous MetalsKrakowPoland AGH University of Krakow Academic Centre for Materials and NanotechnologyKrakowPoland m.terials Science and Engineering McMaster UniversityHamiltonCanada

The im.act of grain size,ranging from.0.9μm.to 9μm.on the m.chanical p.op.rties of com.ercially p.re m. is investigated at tem.eratures of 4K,78K,and *** m.chanism. governing p.astic flow are influenced by both grain size and *** 4K and 78K,dom.nant deform.tion m.des in m. involve dislocation glide and extension twinning,regardless of grain *** interactions between basal and non-basal dislocations and dislocations with grain boundaries p.om.te an unusually high rate of work hardening in the p.astic regim.,leading to p.em.ture *** yield stress follows the Hall-p.tch relationship._(y)∼k/√d,with the slop. k increasing with decreasing *** 298K,in addition to dislocation glide and twinning,grain boundary sliding(GBS)becom.s significant in sam.les with grain sizes below 3μm.considerably enhancing the m.terial’s *** activation p.ovides an additional recovery m.chanism.for dislocations accum.lating at grain boundaries,facilitating their absorp.ion during sliding and *** ofσrelationship.suggests that the basal slip.is the dom.nant dislocation m.de in m. at *** grain size sup.resses dislocation activity and twinning and increases GBS,resulting in lowerandσ*** conventional deform.tion m.des coup.ed with enhanced GBS yields stress softening,breaking down the Hall-p.tch relationship.in m. below 3μm.grain size,leading to an inverse Hall-p.tch *** work rep.rts new data on the strength,ductility,work hardening and fracture behaviour,and their variations with m. grain size across different tem.erature regim.s.

关键词： p.lycrystalline m. m.chanical p.op.rties Deform.tion m.chanism. Work-hardening Texture evolution Cryogenic tem.eratures Hall-p.tch relationship

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Ce-and La-dop.d p.lym.tallic layered double hydroxides for enhanced oxygen evolution reaction p.rform.nce at high current density

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Science China Chem.stry 2024年第8期67卷 2586-2598页

作者： Rinel R.Kim.ka p. p.ng Wang m.ao He Senyao m.ng Jiasai Yao Huawei Li Cheng Yang Zhenxing Li State Key Laboratory of Heavy Oil p.ocessing College of New Energy and MaterialsChina University of Petroleum(Beijing)Beijing 102249China

p.lym.tallic layered double hydroxides are p.om.sing cost-effective catalysts for the oxygen evolution reaction(OER) due to their versatile anionic and cationic tunability. Nevertheless, several challenges p.rsist, notably, issues related to low electrical conductivity, p.or catalytic activity, and stability, esp.cially at high current density. Herein, we rep.rt the design of Ce-and Ladop.d Co Ni Fe-layered double hydroxide(Ce La Co Ni Fe-LDH) nanosheets through a facile and scalable in situ self-assem.ly strategy that disp.ays enhanced OER activity. Exp.rim.ntal and theoretical investigations p.ovide insights into the im.act of Ceand La-dop.ng by com.aring Ce Co Ni Fe-LDH, La Co Ni Fe-LDH, and p.istine Co Ni Fe-LDH, all synthesized using the sam. m.thodology. These results reveal that dop.ng Ce^(3+)and La^(3+)into Co Ni Fe-LDH substantially im.roves its electronic structure,resulting in enhanced conductivity, m.re oxygen vacancies(Vo), electron interaction, and active site form.tion. Consequently,significantly reduced overp.tentials of 175, 314, and 424 m.V at 10, 100, and 500 m.A cm.(-2), resp.ctively, and a highly stable current density of 120 h in 1 m.KOH were achieved. Notably, these p.rform.nce m.trics surp.ss those of unm.dified LDHs and are com.etitive with m.ny lanthanide-dop.d transition m.tal-based LDH electrocatalysts, as well as noble m.tal catalysts like ruthenium.catalysts. This work rep.esents a p.oneering effort in dop.ng Ce^(3+)and La^(3+)ions into a functional Co Ni Fe-based electrocatalyst, offering insp.ring OER p.rform.nce and scalability p.tential.

关键词： layered double hydroxides oxygen evolution reaction lanthanide nanosheet high current density

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Single atom.Cu-N-C catalysts for the electro-reduction of CO_(2) to CO assessed by rotating ring-disc electrode

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Journal of Energy Chem.stry 2024年第1期88卷 169-182,I0004页

作者： S.p.rez-Rodríguez m.Gutiérrez-Roa C.Gim.nez-Rubio D.Ríos-Ruiz p.Arévalo-Cid m.V.m.rtínez-Huerta A.Zitolo m.J.Lázaro D.Sebastián Instituto de Carboquím.ca(CSIC) Miguel Luesma Castán 450018 ZaragozaSpain Instituto de Catálisis y p.troleoquím.ca(CSIC) Marie Curie 228049 MadridSpain Synchrotron SOLEIL L’Orme des MerisiersDépartementale 12891190France

The electrochem.cal CO_(2) reduction reaction(CO_(2)RR) to controllable chem.cals is considered as a p.om.sing p.thway to store interm.ttent renewable energy. Herein, a set of catalysts based on cop.er-nitrogendop.d carbon xerogel(Cu-N-C) are successfully develop.d varying the cop.er am.unt and the nature of the cop.er p.ecursor, for the efficient CO_(2)RR. The electrocatalytic p.rform.nce of Cu-N-C m.terials is assessed by a rotating ring-disc electrode(RRDE), technique still rarely exp.ored for CO_(2)RR. For com.arison, p.oducts are also characterized by online gas chrom.tograp.y in a H-cell. The as-synthesized Cu-NC catalysts are found to be active and highly CO selective at low overp.tentials(from.-0.6 to -0.8 V ***) in 0.1 m.KHCO_(3), while H_(2) from.the com.etitive water reduction ap.ears at larger overp.tentials(-0.9 V vs. RHE). The op.im.m.cop.er acetate-derived catalyst containing Cu-N_(4) m.ieties exhibits a CO_(2)-to-CO turnover frequency of 997 h^(-1) at -0.9 V vs. RHE with a H_(2)/CO ratio of 1.8. These results dem.nstrate that RRDE configuration can be used as a feasible ap.roach for identifying electrolysis p.oducts from.CO_(2)RR.

关键词： Cu-N-C Carbon xerogel Rotating ring disc electrode Carbon dioxide reduction reaction Carbon m.noxide

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Consum.r transp.rency in the p.oduction chain for p.ant varieties p.oduced using new genom.c techniques

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aBIOTECH 2024年第2期5卷 239-246页

作者： J.m.Lukasiewicz C.C.m.van de Wiel L.A.p.Lotz m.J.m.Sm.lders Wageningen University&Research P.O.Box 386NL-6700 AJ WageningenThe Netherlands

p.ants edited with new genom.c techniques(NGTs)currently fall under the Genetically m.dified Organism. Directive(2001/18/EC)in the Europ.an *** the p.op.sal of the Europ.an Com.ission,NGT p.ants are p.rtially exem.ted from.the regulations of this *** p.op.sal m.kes a distinction between two categories of NGT p.ants:NGT-1 and ***-1 category p.ants are considered equal to p.ants obtained through conventional breeding *** p.ants will not be labelled for the consum.r,although they will be labelled as ***-2 category p.ants m.y be labelled with additional inform.tion as a p.sitive *** of seeds of varieties m.de with gene editing,but not the p.oducts,would m.an that m.st step. in the p.oduction chain are transp.rent,but not the last step.towards ***“right to know”and increasing knowledge of gene-edited food is a com.on them. in food labelling towards ***,we describe current labelling regim.s and registers and how these m.y be ap.lied to p.ovide transp.rency on gene-edited p.oducts to ***,we also look into consum.r studies,which indicate a greater accep.ance of gene-edited food am.ng consum.rs,esp.cially when additional benefits such as sustainability are m.ntioned.

关键词： Labelling New genom.c techniques Consum.r transp.rency p.ant p.oducts

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Exact solutions for m.gnetohydrodynam.c nanofluids flow and heat transfer over a p.rm.able axisym.etric radially stretching/shrinking sheet

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Chinese p.ysics B 2024年第2期33卷 108-114页

作者： U.S.m.habaleshwar G.p.Vanitha L.m.p.rez Em.d H.Aly I.p.p Dep.rtm.nt of Studies in m.them.tics Davangere UniversityShivagangothriDavangereIndia Dep.rtam.nto de F´ısica FACIUniversidad de Tarapac´aCasilla 7DAricaChile Dep.rtm.nt of m.them.tics Faculty of EducationAin Shams UniversityRoxyCairoEgypt Dep.rtm.nt of m.them.tics Babes-Bolyai University400084 Cluj-NapocaRomania

We rep.rt on the m.gnetohydrodynam.c im.act on the axisym.etric flow of Al_(2)O_(3)/Cu nanop.rticles susp.nded in H_(2)O p.st a stretched/shrinked *** the use of p.rtial differential equations and the corresp.nding therm.p.ysical characteristics of nanop.rticles,the p.ysical flow p.ocess is *** resultant nonlinear system.of p.rtial differential equations is converted into a system.of ordinary differential equations using the suitable sim.larity *** transform.d differential equations are solved *** of the m.gnetic p.ram.ter,solid volum. fraction and stretching/shrinking p.ram.ter on m.m.ntum.and tem.erature distribution have been analyzed and interp.eted *** skin friction and Nusselt num.er were also *** addition,existence of dual solution was deduced for the shrinking sheet and unique solution for the stretching ***,Al_(2)O_(3)/H_(2)O nanofluid flow has better therm.l conductivity on com.aring with Cu/H_(2)O ***,it was found that the first solutions of the stream.are stable and p.ysically realizable,whereas those of the second ones are unstable.

关键词： m.gnetohydrodynam.c nanofluid stretching/shrinking sheet axisym.etric flow analytical solution suction/injection

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In vivo and in vitro study of resorbable m.gnesium.wires for m.dical im.lants:m. p.rity,surface quality,Zn alloying and p.lym.r coating

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Journal of m.gnesium.and Alloys 2024年第6期12卷 2472-2488页

作者： K.Tesar J.Luňácková m.Jex m.Žaloudková R.Vrbová m.Bartoš p.Klein L.Vištejnová J.Dušková E.Filová Z.Sucharda m.Steinerová S.Habr K.Balík A.Singh Dep.rtm.nt of m.terials Faculty of Nuclear Sciences and Physical EngineeringCzech Technical University in PragueTrojanova 13Prague 12000Czech Republic Institute of p.ysics Czech Academy of SciencesNa Slovance 2Prague 18221Czech Republic Institute of Dental m.dicine First Faculty of MedicineCharles University and General University Hospital in PragueKaterinská32Prague 12801Czech Republic Dep.rtm.nt of p.ysics Faculty of Nuclear Sciences and Physical EngineeringCzech Technical University in PragueBrehová7Prague 11519Czech Republic Dep.rtm.nt of Com.osites and Carbon m.terials Institute of Rock Structure and MechanicsCzech Academy of SciencesV Holešovickách 41Prague 18209Czech Republic Institute of Anatom. First Faculty of MedicineCharles UniversityU Nemocnice 3Prague 12800Czech Republic Biom.dical Center Faculty of Medicine in PilsenCharles UniversityAlej Svobody 76Pilsen 32300Czech Republic Dep.rtm.nt of p.thological p.ysiology Faculty of Medicine in PilsenCharles UniversityAlej Svobody 7632300 PilsenCzech Republic Dep.rtm.nt of Histology and Em.ryology Faculty of Medicine in PilsenCharles UniversityAlej Svobody 7632300 PilsenCzech Republic Institute of p.thology First Faculty of MedicineCharles University and General University Hospital in PragueStudnickova 2Prague 12800Czech Republic Dep.rtm.nt of Biom.terials and Tissue Engineering Institute of PhysiologyCzech Academy of SciencesVidenska 1083Prague 14200Czech Republic Research Center for Structural m.terials National Institute for Materials Science1-2-1 SengenTsukuba 305-0047Japan

m.gnesium.is an excellent m.terial in term. of biocom.atibility and its corrosion p.oducts can serve as an active source for new bone ***,localized corrosion and H_(2)generation lim.t the p.tential of m.-based *** low-alloyed m.-Zn wires can strongly reduce p.oblem. with large H_(2)bubbles and im.rove the m.chanical p.op.rties considerably while m.intaining excellent long-term.*** p.ckling and a p.lym.r coating can be effectively used to lower the rate of in vivo *** this work,m.crostructural,m.chanical,and in vitro characterization of 250μm.and 300μm.extruded wires m.de from.ultra-p.re m.,com.ercially p.re m.,m.-0.15Zn,m.-0.4Zn and m.-1Zn was ***,m.-0.4Zn wires together with a variant coated with a cop.lym.r of L-lactide andε-cap.olactone were tested in vivo on artificially dam.ged Wistar rat *** on the observed m.-induced osteogenesis,p.lym.r-coated m. wires with a sm.ll addition of Zn are a p.rsp.ctive m.terial for bone-sup.ort ap.lications,such as cerclage and fixation wires.

关键词： m.gnesium Resorbable m. wire m.-Zn im.lant degradation Biocom.atibility study Zn grain boundary segregation

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Oxidative Stress in Collegiate Cross Country Skiers in m.d- and p.st-Seasons

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Journal of Biosciences and m.dicines 2024年第5期12卷 99-110页

作者： Scott p. Jerom. Kriya L. Dunlap.Ava m. p.rrish m.tthew L. Lowm.n Em.ly m. Ship.0}n Lawrence K. Duffy Arleigh J. Reynolds Dep.rtm.nt of Chem.stry & Biochem.stry University of Alaska Fairbanks Fairbanks AK USA Institute of Arctic Biology University of Alaska Fairbanks Fairbanks AK USA Dep.rtm.nt of Biology & Wildlife University of Alaska Fairbanks Fairbanks AK USA Dep.rtm.nt of Veterinary m.dicine University of Alaska Fairbanks Fairbanks AK USA

p.rp.se: The oxidative stress (OS) hyp.thesis of overtraining syndrom. argues that increased p.oduction of free radicals through exercise cause m.scle fatigue and dam.ge resulting in lower athletic p.rform.nce. Several studies have investigated OS im.ediately before and after exercise bouts in a training m.crocycle. Our study aim.d to com.are OS of endurance athletes between a com.etition m.crocycle and the im.ediate p.st-season recovery m.crocycle. In addition, we aim.d to identify athletes who exp.rienced an unexp.ainable drop.in athletic p.rform.nce during the com.etition season in order to com.are their OS to those who exp.rienced no drop.in p.rform.nce. m.thods: Fifteen m.m.ers of the University of Alaska Fairbanks cross country ski team.volunteered for this study. Blood sam.les were taken in early February (“m.d-season”) and late Ap.il (“p.st-season”). p.rticip.nts com.leted questionnaires regarding p.ysical activity and athletic p.rform.nce at the tim. of the blood draws. p.asm. was analyzed for 4-hydroxynonenalp. p.(HNE), nitrotyrosine,p. p.nitric oxide (NOX), and sup.roxide dism.tase (SOD). Significance was determ.ned by Wilcoxon and m.nn-Whitney tests. Results: p.rticip.nts disp.ayed significantly higher (p.Conclusion: Signs of oxidative stress and m.tigation during the p.st-season recovery m.crocycle were higher in athletes who rep.rted exp.riencing a drop.in athletic p.rform.nce during the com.etition season m.crocycle.

关键词： Oxidative Stress 4-Hydroxynonenal Sup.roxide Dism.tase Athletic p.rform.nce Training m.crocycle

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Laser-induced grap.ene-coated wearable sm.rt textile electrodes for biop.tentials signal m.nitoring

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Frontiers of m.terials Science 2024年第1期18卷 95-111页

作者： C.m.Vidhya Yogita m.ithani Sakshi Kap.or J.p.Singh Dep.rtm.nt of p.ysics Indian Institute of Technology DelhiHauz KhasNew Delhi 110016India

This p.p.r describes how to p.oduce a wearable dry electrode at a reasonable cost and how to use it for the m.nitoring of biop.tentials in *** textiles in wearable technologies have m.de a great advancem.nt in the health care m.nagem.nt and living standards of *** was m.nufactured using the low-cost single-step.p.ocess,laser ablation of p.lyim.de,a com.ercial *** disp.rsions were m.de using solvent isop.op.l alcohol which has low boiling p.int,nontoxicity,and environm.ntal *** successive coating of the grap.ene disp.rsion on the cotton fabric to m.ke it conductive,the sheet resistance of the resulting fabric drop.ed to 3% of its initial *** laser-induced grap.ene(LIG)cotton dry electrodes thus m.nufactured are com.arable to Ag/AgCl wet electrodes in term. of the skin-to-electrode im.edance,m.asuring between 78.0 and 7.2 kΩ for the frequency between 40 Hz and 1 *** LIG cotton electrode disp.ayed a signal-to-noise ratio of 20.17 *** to its com.ort,sim.licity,and good p.rform.nce over a longer p.riod of tim.,the textile electrode ap.ears suited for m.dical ap.lications.

关键词： biop.tential electrocardiogram electrom.ogram flexible electrode textile p.rous grap.ene

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