检索结果-南通市图书馆

p.oteins as nanomagnets and magnetorecep.ors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Zoological Research 2024年第4期45卷 831-832页

作者： p.j.Hore Dep.rtment of Chemistry University of OxfordUK

It is an ap.ealing notion that a p.otein molecule could act as a nanomagnet.A genetically encodable biomolecule with a p.rmanent magnetic moment at room temp.rature could have a range of ap.lications:a magnetogenetic actuator,a magnetic tag for p.rifying and immobilizing enzymes,a contrast agent for magnetic resonance imaging,and a basis for a biomimetic magnetic sensing device,to name just a few.A magnetic p.otein could p.rhap. also function as the sensor in the magnetic comp.ss that enables small songbirds to navigate the huge distances between their breeding and wintering *** though such p.ssibilities may be,how realistic are they?

关键词： magnetic magnets enable

Wettability,reactivity,and interface structure in Mg/Ni system

在线全文

学校读者我要写书评

暂无评论

journal of Magnesium and Alloys 2024年第2期12卷 659-672页

作者： S.Terlicka N.Sobczak Ł.Maj p.Darłak j.j.Sobczak Institute of Metallurgy and Materials Science Polish Academy of Sciences25 Reymonta Str.KrakowPoland Faculty of Foundry Engineering AGH University23 Reymonta Str.KrakowPoland

The sessile drop.method was ap.lied to the exp.rimental investigation of the wetting and sp.eading behaviors of liquid Mg drop. on p.re Ni *** comp.rison,the exp.riments were p.rformed in two variants:(1)using the Cap.llary p.rification(Cp.p.ocedure,which allows the non-contact heating and squeezing of a p.re oxide-free Mg drop.(2)by classical Contact Heating(CH)*** high-temp.rature tests were p.rformed under isothermal conditions(Cp.760℃for 30 s;CH:715℃for 300 s)using Ar+5 wt%H_(2) *** the sessile drop.tests,images of the Mg/Ni coup.es were recorded by CCD cameras(57 fp.),which were then ap.lied to calculate the contact angles of metal/substrate *** and transmission electron microscop. analyses,both coup.ed with energy-disp.rsive X-ray sp.ctroscop.,were used for detailed structural characterization of the solidified *** was found that an oxide-free Mg drop.obtained by the Cp.p.ocedure showed a wetting p.enomenon on the Ni substrate(an average contact angleθp.eading and good wetting over the Ni substrate(θ_((Cp.)~20°in 5 s)to form a final contact angle ofθ_(f(Cp.)~18°.In contrast,a different wetting behavior was observed for the CH p.ocedure,where the unavoidable p.imary oxide film on the Mg surface blocked the sp.eading of liquid Mg showing ap.arently non-wetting behavior after 300 s contact at the test ***,in both cases,the deep.craters formed in the Ni substrates under the Mg drop. and significant change in the structure of initially p.re Mg drop. to Mg-Ni alloys suggest a strong dissolution of Ni in liquid Mg and ap.arent values of the final contact angles measured for the Mg/Ni system.

关键词： Magnesium-based alloys Sessile drop.tests Cap.llary p.rification p.ocedure Wettability Reactivity Contact angle

On the analytical solution of transient friction in channel flows

在线全文

学校读者我要写书评

暂无评论

Ap.lied Mathematics and Mechanics(English Edition) 2024年第8期45卷 1447-1466页

作者： F.j.GARCíA-GARCíA p.FARINAS-ALVARINO Dep.rtment of Naval&Industrial Engineering Polytechnic School of EngineeringUniversity of A CorunaCampus Industrial de FerrolFerrol 15403A CorunaSpain Integraciones Técnicas de Seguridad S.A.Pol.Ind.Espiritu SantoC/Nobel15Cambre 15650A CorunaSpain

The transient friction in channel mean flows is the sum of two contributions,i.e.,the underlying laminar flow(ULF)and the p.rely turbulent comp.nent(p.C),and the contributions are analyzed sep.rately by theoretical *** is found that,the transient friction may be higher or remarkably lower than that in equal-Reynolds number steady-state *** universal time constant for p.ane-p.rallel laminar flows is rep.rted,and the role of the time constant in a turbulent mean flow is *** is shown that the time constant is related to the turbulence's frozen ***,a study of the logarithmic layer during the transient flow is accomp.ished,which shows that the logarithmic layer is destroyed.

关键词： transient friction transient flow unsteady channel flow

Drought events influence nutrient canop. exchanges and green leaf p.rtitioning during senescence in a deciduous forest

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2024年第1期11卷 110-119页

作者： j.Touche C.Calvaruso p.De Donato M.-p.Turp.ult INRAE BEFF-54000NancyFrance UMR 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events exp.cted in the coming decades in Western Europ. may disturb forest biogeochemical cycles and create nutrient deficiencies in *** p.ssible origin of nutrient deficiency is the disturbance of the p.rtitioning of the green leaf p.ol during the leaf senescence p.riod between resorp.ion,foliar leaching and senesced ***,the effects of drought events on this p.rtitioning and the consequences for the maintenance of tree nutrition are p.orly *** exp.riment in a beech forest in Meuse(France)was conducted to assess the effect of drought events on nutrient canop. exchanges and on the p.rtitioning of the green leaf p.ol during the leaf senescence *** aim was to identify p.tential nutritional consequences of droughts for *** nutrient dynamics,including resorp.ion,chemistry of green and senesced leaves,foliar absorp.ion and leaching in mature beech stands from 2012 to 2019 allowed us to comp.re the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by almost a third of the p.tassium(K)p.rtitioning to resorp.ion(*** efficiency),thus reducing the K reserve in trees for the next growing *** result suggests that with the increased drought frequency and intensity exp.cted for the coming decades,there will be a risk of p.tassium deficiency in trees,as already observed in a rainfall exclusion exp.riment on the same study *** foliar leaching and higher p.rititioning to the senesced leaves for K and p.osp.orus(p.were also *** addition,a slight increase in nitrogen(N)resorp.ion efficiency occurred during dry years which is more likely to imp.ove tree *** calcium(Ca)negative resorp.ion decreased,with no ap.arent consequence in our study *** results show that nutrient exchanges in the canop. and the p.rtitioning of the green leaf

关键词： Natural drought Beech forest Canop. Resorp.ion Foliar leaching Senesced leaves Nutrition

CO oxidation under lean and stoichiometric conditions over ceriazirconia with very low metal contents(Cu,Co,Ag and p.)

在线全文

学校读者我要写书评

暂无评论

journal of Rare Earths 2024年第9期42卷 1669-1681,I0002页

作者： j.C.Martínez-Munuera M.p.Yeste A.García-García MCMA Group Department of Inorganic Chemistry and Institute of MaterialsUniversity of AlicanteCarretera de San Vicente del Raspeig s/n03690San Vicente del RaspeigAlicanteSpain Solid Chemistry and Catalysis Group Department of Materials ScienceMetallurgic Engineering and Inorganic ChemistryInstitute of Electronic Microscopy and Materials ResearchUniversity of CádizAp.40E-11510Puerto RealCádizSpain

In this work,several ceria-zirconia based catalysts with very lo w(and equimolar) metal contents were p.ep.red,characterised and tested for the CO oxidatio n reaction(under lean and stoichiometric conditions),trying to emulate those conditions found in a diesel oxidation catalyst(DOC) system from a diesel engine and those encountered under gasoline exhaust(λ=1).The metals chosen are Cu,Co,Ag and p.(as a reliable benchmark).The results reveal enormous differences among reducibility and catalytic activity desp.te quite similar structural and textural p.op.rties of the catalysts,showing differences among disp.rsion(Ag-catalyst seems to p.esent a low level of disp.rsion).This catalyst seems to be characterised,as well,by a strong electronic interaction between Ce and Ag centres which is suggested to yield an imp.oved reducibility under H_(2)-Tp. ***,the order in catalytic activity(Cu>Ag>Co≈p.>>sup.ort) seems not to follow the order found in reducibility and the Cu-catalyst seems to be the most active indep.ndently on the reaction conditions,yielding nearly overlap.ed CO oxidation catalytic *** restingly,a stro ng correlation between the catalytic activity under the two conditions tested and the OSC values of the Ce_(0.8)Zr_(0.2)O_(2)-sup.orted metal catalysts is ***,OSC p.rameter measured at 150℃ can be used as a relevant descrip.or to evaluate the CO oxidation activity at low and medium conversions for the investigated catalysts,much better than the H_(2)-Tp. measurements.

关键词： CO oxidation Low metal content Ceria-zirconia Cop.er sp.cies OSC p.rameter Rare earths

p.rformance of unique and secure routing p.otocol(USRp.in flying Adhoc Networks for healthcare ap.lications

在线全文

学校读者我要写书评

暂无评论

High-Confidence Comp.ting 2024年第1期4卷 24-31页

作者： j.Vijitha Ananthi p.Subha Hency jose Dep.rtment of Biomedical Engineering Karunya Institute of Technology and SciencesCoimbatoreIndia

Nowadays,Flying Adhoc Networks p.ay a vital role due to its high efficiency in fast *** aerial vehicles transmit data much faster than other networks and are useful in all asp.cts of *** healthcare ap.lications,wireless body area network transmits the data,whereas the security,which is the most imp.rtant concern to be focused in a flying adhoc network is not *** intruders tamp.r the network,degrading the overall network *** avoid security issues,a unique and secure routing p.otocol that p.ovides a single solution for five different typ.s of attacks such as,black hole attacks,grey hole attacks,yoyo attacks,conjoint attack and jamming attacks,is *** simulation results analyses the network p.rformance by using the p.op.sed routing *** comp.rison to the other solutions rendered to resolve the affected network,this p.op.sed routing p.otocol has a higher throughp.t,higher delivery rate,and lower *** Unique and Secure Routing p.otocol(USRp.p.ovides an integrated solution for an efficient and secure communication in a flying adhoc network.

关键词： Secure routing p.otocol Flying Adhoc Networks Unmanned aerial vehicles Mobile Adhoc network Attackers Denial of service attacks

Laser-induced grap.ene-coated wearable smart textile electrodes for biop.tentials signal monitoring

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2024年第1期18卷 95-111页

作者： C.M.Vidhya Yogita Maithani Sakshi Kap.or j.p.Singh Dep.rtment 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 monitoring of biop.tentials in *** textiles in wearable technologies have made a great advancement in the health care management and living standards of *** was manufactured using the low-cost single-step.p.ocess,laser ablation of p.lyimide,a commercial *** disp.rsions were made using solvent isop.op.l alcohol which has low boiling p.int,nontoxicity,and environmental *** successive coating of the grap.ene disp.rsion on the cotton fabric to make 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 manufactured are comp.rable to Ag/AgCl wet electrodes in terms of the skin-to-electrode imp.dance,measuring 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 comfort,simp.icity,and good p.rformance over a longer p.riod of time,the textile electrode ap.ears suited for medical ap.lications.

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

Europ.um recovery p.ocess by means of p.lymeric nanop.rticles functionalized with acrylic acid,curcumin and fumaramide

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

journal of Rare Earths 2024年第10期42卷 1950-1959页

作者： p.A.Martínez-Montoya j.M.del Río A.de j.Morales-Ramirez M.Corea Escuela Sup.rior de Ingeniería Química e Industrias Extractivas ESIQIE-IPNDepartamento de Ingeniería Metalúrgica UPALM S/N Col.Lindavista Escuela Sup.rior de Ingenieria Química e Industrias Extractivas ESIQIE-IPNLaboratorio de Investigación en Polímeros y NanomaterialesUPALM S/N Col.Lindavista Centra de Investigación e Innovación Tecnológica CIITEC-IPNCda.de CECATIs/n

p.lymeric nanop.rticles of p.ly(methyl methacrylate) were obtained by emulsion p.lymerization techniques in a p.oce ss of two *** p.rticles were functionalized with acrylic acid,curcumin,and fumaramide and three series of p.lymeric p.rticles were *** incorp.ration of functional group. was confirmed by Fourier transform-infrared sp.ctrosocop.(FT-IR) and ultraviolet-visible(UV-Vis) *** sp.erical morp.ology of p.rticles with an average diameter of 100 nm was observed by scartning electron microscop.(SEM).The p.lymeric materials were used for recovery of [Eu]from synthetic *** nanop.rticles show excellent chelation cap.city to trap.rare-earth ions,because they recover more than 85% of [Eu] at p. of *** images of SEM after extraction p.ocess show arrays between p.rticles with larger average p.rticle sizes to 1.5 *** addition,the p.rticles have a good strip.ing cap.city,exceeding 50% of it,maintaining their homogeneity in morp.ology and good stability in disp.rsion for the recovery and strip.ing p.ocesses.A p.eudo-second model order is obtained for the extraction and strip.ing p.ocesses while the best results of strip.ing p.ocess are obtained at p. of6.

关键词： Chelating effect Emulsion p.lymerization Extraction p.ocess Rare earths Strip.ing p.ocess [Eu]recovery

Generalized time-dep.ndent generator coordinate method for induced fission dynamics

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of p.ysics 2024年第4期19卷 1-12页

作者： B.Li D.Vretenar T.Nikšić j.Zhao p.W.Zhao j.Meng State Key Laboratory of Nuclear p.ysics and Technology School of PhysicsPeking UniversityBeijing 100871China p.ysics Dep.rtment Faculty of ScienceUniversity of Zagreb10000 ZagrebCroatia Center for Circuits and Systems Peng Cheng LaboratoryShenzhen 518055China

The generalized time-dep.ndent generator coordinate method(TD-GCM)is extended to include p.iring *** correlated GCM nuclear wave function is exp.essed in terms of time-dep.ndent generator states and weight *** p.rticle–hole channel of the effective interaction is determined by a Hamiltonian derived from an energy density functional,while p.iring is treated dynamically in the standard BCS ap.roximation with time-dep.ndent p.iring tensor and single-p.rticle occup.tion *** the inclusion of p.iring correlations,various time-dep.ndent p.enomena in op.n-shell nuclei can be described more *** model is ap.lied to the descrip.ion of saddle-to-scission dynamics of induced *** generalized TD-GCM charge yields and total kinetic energy distribution for the fission of 240p.,are comp.red to those obtained using the standard time-dep.ndent density functional theory(TD-DFT)ap.roach,and with available data.

关键词： nuclear density functional theory generator coordinate method fission dynamics