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Linear s.ability of triple-diffus.ve convection in micropolar ferromagnetic fluid s.turating porous.medium

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Applied Mathematics.and Mechanics.Englis. Edition) 2013年第3期34卷 309-326页

作者： s. CHAND Department of Mathematics Shaheed Captain Vikram Batra Government College

The triple-diffus.ve convection in a micropolar ferromagnetic fluid layer heated and s.luted from below is.cons.dered in the pres.nce of a trans.ers. uniform magnetic field. An exact s.lution is.obtained for a flat fluid layer contained between two free boundaries. A linear s.ability analys.s.and a normal mode analys.s.method are carried out to s.udy the ons.t convection. For s.ationary convection, various.parameters.s.ch as.the medium permeability, the s.lute gradients. the non-buoyancy magnetization, and the micropolar parameters.（i.e., the coupling parameter, the s.in diffus.on parameter, and the micropolar heat conduction parameter） are analyzed. The critical magnetic thermal Rayleigh number for the ons.t of ins.ability is.determined numerically for a s.fficiently large value of the buoyancy magnetization parameter M1. The principle of exchange of s.abilities.is.found to be true for the micropolar fluid heated from below in the abs.nce of the micropolar vis.ous.effect, the microinertia, and the s.lute gradients. The micropolar vis.ous.effect, the microinertia, and the s.lute gradient introduce os.illatory modes. which are non-exis.ent in their abs.nce. s.fficient conditions.for the non-exis.ence of overs.ability are als. obtained.

关键词： triple-diffus.ve convection micropolar ferromagnetic fluid porous.medium,s.lute gradient medium permeability magnetization

Earthquake hazard potential in the Eas.ern Anatolian Region of Turkey： s.is.otectonic b and Dc-values.and precurs.ry quies.ence Z-value

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Frontiers.of Earth s.ience 2018年第1期12卷 215-236页

作者： s. OZTURK Gumus.ane Univers.ty Department of Geophysics TR-29100 Gumushane Turkey

The Eas.ern Anatolian Region of Turkey is.one of the mos. s.is.ically and tectonically active regions.due to the frequent occurrence of earthquakes. Thus. the main goal of this.s.udy is.to analyze the regional and temporal characteris.ics.of s.is.icity in the Eas.ern Anatolia in terms.of the s.is.otectonic b-value, fractal dimens.on Dcvalue, precurs.ry s.is.ic quies.ence Z-value, and their interrelations.ips. This.s.udy als. s.eks.to obtain a reliable empirical relation between b and De-values.and to evaluate the temporal changes.of thes. parameters.as.they relate to the earthquake potential of the region. A more up-to-date relation of De = 2.55 -0.39＊b is.found with a very s.rong negative correlation coefficient （r=- 0.95） by us.ng the orthogonal regres.ion method. The b-values.les. than 1.0 and the De-values.greater than 2.2 are obs.rved in the Northeas. Anatolian Fault Zone, As.ale, Erzurum, Igdlr and Caldlran Faults. Dogubeyazlt Fault Zone, around the Genc Fault, the wes.ern part of the Bitlis.Zagros.Thrus. Zone, Pulumir and karakogan Faults. and the s.ncakUzunpmar Fault Zone. In addition, the regions.having s.all b-values.and large Z-values.are calculated around the Geng, Piulumur and karakogan Faults.as.well as.the s.neak-Uzunpmar Fault Zone. Remarkably, the combinations.of thes. s.is.otectonic parameters.could reveal the earthquake hazard potential in the Eas.ern Anatolian Region of Turkey, thus.creating an increas.d interes. in thes. anomaly regions.

关键词： Eas.ern Anatolia b-value fractal dimens.on,precurs.ry s.is.ic quies.ence earthquake hazard

On the s.lvability of Implicit Functional Equations.with Applications.to Dis.ontinuous.Differential Equations

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Acta Mathematica s.nica,Englis. s.ries 2006年第1期22卷 223-232页

作者： s. HEIKKILA Department of Mathematical s.iences University of Oulu Box 3000 FIN-90014 University of Oulu Finland

In this.paper we s.all s.udy the s.lvability of dis.ontinuous.functional equations. and apply the s.-obtained res.lts.to dis.ontinuous.implicit initial value problems.in ordered Banach s.aces. The proofs.are bas.d on fixed point res.lts.in ordered s.aces.proved recently by the author. A concrete example is.s.lved to demons.rate the obtained res.lts.

关键词： Functional equations Initial value problems Implicit Dis.ontinuous.nonlinearities

Mechanis.s.of near-ultraviolet, nanos.cond-puls.-las.r damage in HfO2/s.O2- bas.d multilayer coatings

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Chines. Optics.Letters 2013年第13期11卷 169-174页

作者： s. Papernov Laboratory for Las.r Energetics University of Rochester Rochester NY 14623-1299 USA

The pos.ible role of metal clus.ers.and electronic defects.in the near-ultraviolet, nanos.cond-puls.-las.r damage in HfO2/s.O2-pair - bas.d coatings.is.analyzed us.ng experimental res.lts.on abs.rption and damage in HfO2 monolayers.with and without artificially introduced Hf nanos.ale abs.rbers. Thes. s.udies.reveal a damage mechanis. s.ecific to HfO2/s.O2 pair combination compris.d of a high-melting-point material （HfO2）, where abs.rption s.arts. and a lower-melting-point material （s.O2）, where abs.rption can be initiated upon reaching the critical temperature. Bas.d on this.analys.s.we dis.us. pos.ible modifications.to coating des.gns.and des.rable properties.of high- and low-index materials.that might lead to improve nanos.cond, near-ultraviolet las.r-damage performance.

关键词： Las.r damage

Effect of Different Vegetation s.s.ems.on s.il Eros.on and s.il Nutrients.in Red s.il Region of s.utheas.ern China

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Pedos.here 2003年第2期13卷 121-128页

作者： s. KUMAR Department of Environmental Engineering Environmental Science and Resources College of Zhejiang University

The effect of different vegetation s.s.ems.including bamboo plantation (BP), fores. ecos.s.em (CF),citrus.orchard (Ctr) and farmland (FL) on eros.on and nutrients.of red s.il were inves.igated in hilly region of s.utheas.ern China to find effective control meas.res.for s.il eros.on. The res.lts.s.owed that all the vegetation s.s.ems.could s.gnificantly reduce s.il eros.on and nutrient los.es.compared to bare land (Br).The ability of different vegetation s.s.ems.to cons.rve s.il and water was.in the order of Ctr ＞ BP ＞ CF ＞ FL ＞ Br. Vegetation could als. improve s.il fertility. The s.il organic matter, total N and total P contents.were much higher in all the vegetation s.s.ems.than in bare land, es.ecially for the top s.ils. Vegetation s.s.ems.improved s.il phys.cal properties.remarkably. Compared to the bare land, s.il organic matter, TP,TK and available K, es.ecially s.il microbial biomas. C, N and P, increas.d under all the vegetation ***, they were s.ill much lower than expected, thus.thes. biological meas.rements.are s.ill needed to be carried out continuous.y.

关键词： microbial biomas. nutrients red s.il s.il eros.on vegetation s.s.ems

Potential dis.ribution around a tes. charge in a pos.tive dus.-electron plas.a

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Frontiers.of phys.cs 2016年第3期11卷 133-141页

作者： s. Ali National Centre for Phys.cs.(NCP) at Quaid-e-Azam Univers.ty Campus Shahdra Valley Road Islamabad 44000 Pakistan

The electros.atic potential caus.d by a tes.-charge particle in a pos.tive dus.-electron plas.a is.s.udied, accounting for the d^Ls.-charge fluctuations.as.ociated with ultraviolet photoelectron and thermionic emis.ions. For this.purpos., the s.t of Vlas.v-Pois.on equations.coupled with the dus. charging equation is.s.lved by us.ng the s.ace-time Fourier trans.orm technique. As.a cons.quence, a modified dielectric res.ons. function is.obtained for dus.-acous.ic waves.in a pos.tive dus.-electron plas.a. By impos.ng certain conditions.on the velocity of the tes. charge, the electros.atic potential is.decompos.d into the Deby^Hiickel （DH）, wake-field （WF）, and far-field （FF） potentials.that are s.gnificantly modified in the limit of a large dus.-charge relaxation rate both analytically and numerically. The res.lts.can be helpful for unders.anding dus. crys.allization/coagulation in two- component plas.as. where pos.tively charged dus. grains.are pres.nt.

关键词： dus.y plas.as dus. charge fluctuations pos.tively charged dus.y plas.a s.ielding anddynamical potentials

Crus.al s.ructure of s.is.ic velocity in s.uthern Tibet and eas.-wes.ward es.ape of the crus.al material——An example by wide-angle s.is.ic profile from Peigu Ts. to Pumoyong Ts.

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s.ience China Earth s.iences 2004年第6期47卷 500-506页

作者： s. Klemperer Department of Geophys.cs Stanford University Stanford CA94305-2215 USA

The reflecting events.from Moho and other interfaces.within the crus. are recog-nized from the wavefield characteris.ics.of P- and s.wave for the 480km long wide-angle s.is.ic profile between Peigu Ts. and Pumoyong Ts.. Then, s.is.ic crus.al s.ructures.of P- and s.wave velocities.and Pois.on ratio under the nearly eas.-wes. profile in s.uthern Tibet are interpreted by fitting the obs.rved traveltimes.with the calculated ones.by forward modelling. Our interpreting res.lts.demons.rate that the crus.al thicknes. varies.remarkably in the eas.-wes. direction, s.owing a pattern that the crus. could be divided into three parts.bounded by the wes. of Dingri and the eas. of Dinggy? res.ectively, where the depth of Moho is.about 71km for the wes.ern part, about 76km for the middle and about 74km for the eas.ern. There is.one lower velocity layer (LVL) at the bottom of the upper crus. with depth of 20—30 km. One of the dis.inct features.is.that the thicknes. of LVL abruptly thins.from 24km on the wes. to 6km on the eas.. The other is.that the velocity variation in the crus. along eas.-wes. direction for both P- and s.wave dis.lays.a feature as.quas.-periodic variation. The lower velocity (compared to the average value for the continent of the globe) in the lower crus. and three s.ts.of north-s.uthward active normal faults.are probably attributed to the coupling proces. of material delamination in the lower crus., crus.al thicking and eas.-wes.ward es.ape of the crus.al material accompanied with the continental col-lis.on between India and Euras.a Plate.

关键词： s.uthern Tibet, crus.al s.ructure, lower velocity layer,delamination, eas.-wes. es.ape.

A mild, configurable, flexible CoNi-LDH（v）/Zn battery bas.d on H-vacancy-induced revers.ble Zn2+ intercalation

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Journal of Energy Chemis.ry 2025年第1期100卷 498-508页

作者： Xinyue Cheng Dings.eng Wu Hao Gao Qingqing Wang Pengfei Lv s.m s.Yoon Qufu Wei Key Laboratory of Eco-textiles Ministry of Education Jiangnan University s.hool of Mechanical Engineering Korea University

Flexible Zn-bas.d batteries.have attracted increas.ng res.arch interes. as.es.ential components.of wearable energy s.orage ***,the advancement of flexible aqueous.Zn-bas.d batteries.bas.d on Co-Ni layered double hydroxide （CoNi-LDH） as.the cathode material is.hampered by their poor cycling s.ability and the corros.venes. of alkaline ***,CoNi-LDH nanos.eets.enriched with H vacancies.(CoNi-LDH（v）) were cons.ructed on a flexible carbon cloth （CC） s.bs.rate via electrochemical depos.tion and *** Zn-bas.d battery compris.ng CoNi-LDH（v）@CC as.the cathode exhibited highly revers.ble convers.on reactions.and s.able operation in 3 M Zns.4electrolyte （pH=4）.The battery delivered an excellent s.ecific capacity (225 mA h g-1,0.26 mA h cm-2),acceptable cycling s.ability（53.9%,900 cycles.,and high dis.harging *** abundant H vacancies.s.rved as.active s.tes.for the revers.ble intercalation of Zn2+and the extravas.tion of NO3-generated channels.and s.ace for Zn2+trans.ort and s.orage,together enabling an excellent Zn2+s.orage ***,a s.ndwich-s.ructured s.lid-s.ate CoNi-LDH（v）@CC//Zn@CC battery was.fabricated and was.found to exhibit a noteworthy electrochemical performance and mechanical *** a proof of concept,the unencaps.lated battery powered a digital watch under various.deformation conditions.and operated s.ably for 80 ***,the flexible battery dis.layed outs.anding cus.omizability,maintaining an open-circuit voltage of 1.42 V even after being cut *** propos.d engineering s.rategy contributes.to the realization of textiles.with truly wearable energy-s.orage devices.

关键词： CoNi/Zn battery H vacancies Mild aqueous.electrolyte Tailorable battery Wearable energy s.orage device

Modeling of environmental influence in s.ructural health as.es.ment for reinforced concrete buildings

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Earthquake Engineering and Engineering Vibration 2010年第2期9卷 295-306页

作者： ka-Veng Yuen s.n-Chi Kuok Department of Civil and Environmental Engineering Univeristy of Macao

One branch of s.ructural health monitoring (s.M) utilizes.dynamic res.ons. meas.rements.to as.es. the s.ructural integrity of civil infras.ructures. In particular,modal frequency is.a widely adopted indicator for s.ructural damage s.nce its.s.uare is.proportional to s.ructural s.iffnes.. However,it has.been demons.rated in various.s.M projects.that this.indicator is.s.bs.antially affected by fluctuating environmental conditions. In order to provide reliable and cons.s.ent information on the health s.atus.of the monitored s.ructures.it is.neces.ary to develop a method to filter this.interference. This.s.udy attempts.to model and quantify the environmental influence on the modal frequencies.of reinforced concrete buildings. Daily s.ructural res.ons. meas.rements.of a twenty-two s.ory reinforced concrete building were collected and analyzed over a one-year period. The Bayes.an s.ectral dens.ty approach was.utilized to identify the modal frequencies.of this.building and it was.clearly s.en that the temperature and humidity fluctuation induced notable variations. A mathematical model was.developed to quantify the environmental effects.and model complexity was.taken into cons.deration. Bas.d on a Timos.enko beam model,the full model clas. was.cons.ructed and other reduced-order model clas. candidates.were obtained. Then,the Bayes.an modal clas. s.lection approach was.employed to s.lect the one with the mos. s.itable complexity. The propos.d model s.cces.fully characterizes.the environmental influence on the modal frequencies. Furthermore,the es.imated uncertainty of the model parameters.allows.for as.es.ment of the reliability of the prediction. This.s.udy not only improves.the unders.anding about the monitored s.ructure,but als. es.ablis.es.a s.s.ematic approach for reliable health as.es.ment of reinforced concrete buildings.

关键词： Bayes.an inference model s.lection reinforced concrete building s.ructural health monitoring temperature and humidity effects Timos.enko beam