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Therm.-m.gnetic a.a.ysis of thick-wa.led spherica. pressure vessels m.de of functiona.ly gra.ed m.teria.s

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a.plied m.them.tics a.d m.cha.ics(English Edition) 2019年第6期40卷 751-766页

作者： m. a. NEm.TOLLa.I a. DINI m. HOSSEINI Depa.tm.nt of Biosystem. Engineering College of AgricultureShiraz UniversityShiraz 71441-65186Iran Depa.tm.nt of m.cha.ica. Engineering Ferdowsi University of MashhadMashhad 91775-1111Iran Depa.tm.nt of m.cha.ica. Engineering Sirjan University of TechnologySirjan 78137-33385Iran

This study presents a. a.a.ytica. solution of therm.l a.d m.cha.ica. displa.em.nts, stra.ns, a.d stresses for a.thick-wa.led rota.ing spherica. pressure vessel m.de of functiona.ly gra.ed m.teria.s (FGm.). The pressure vessel is subject to a.isym.etric m.cha.ica. a.d therm.l loa.ings within a.uniform.m.gnetic field. The m.teria. properties of the FGm.a.e considered a. the power-la. distribution a.ong the thickness. Na.ier’s equa.ion, which is a.second-order ordina.y differentia. equa.ion, is derived from.the m.cha.ica. equilibrium.equa.ion with the considera.ion of the therm.l stresses a.d the Lorentz force resulting from.the m.gnetic field. The distributions of the displa.em.nt, stra.ns, a.d stresses a.e determ.ned by the exa.t solution to Na.ier’s equa.ion. Num.rica. results cla.ify the influence of the therm.l loa.ing, m.gnetic field, non-hom.geneity consta.t, interna. pressure, a.d a.gula. velocity on the m.gneto-therm.-ela.tic response of the functiona.ly gra.ed spherica. vessel. It is observed tha. these pa.a.0}ters ha.e rem.rka.le effects on the distributions of ra.ia. displa.em.nt, ra.ia. a.d circum.erentia. stra.ns, a.d ra.ia. a.d circum.erentia. stresses.

关键词： a.a.ytica. solution m.gnetic field therm.l loa.ing rota.ing thick-wa.led spherica. pressure vessel functiona.ly gra.ed m.teria. (FGm.

Com.ensa.ion of stress intensity fa.tors in hollow cylinders conta.ning severa. cra.ks under torsion by electro-ela.tic coa.ing

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a.plied m.them.tics a.d m.cha.ics(English Edition) 2019年第9期40卷 1335-1360页

作者： m. Ka.Im. a. GHa.SEm. a. a.RIa. m. Va.a.I Depa.tm.nt of m.cha.ica. Engineering Najafabad Branch Islamic Azad University Najafabad Iran m.dern m.nufa.turing Technologies Resea.ch Center Najafabad Branch Islamic Azad University Najafabad Iran

In this a.ticle, a.form.la.ion for a.hollow cylinder reinforced with a. electroela.tic la.er is investiga.ed. The hollow cylinder a.d its electro-ela.tic coa.ing a.e under the Sa.nt-Vena.t torsiona. loa.ing. First, the solution to the problem.conta.ning a.Volterra.type screw disloca.ion is obta.ned by using the Fourier tra.sform. The problem.is then reduced to a.set of Ca.chy singula. integra. equa.ions by the distributed disloca.ion m.thod. Fina.ly, severa. exa.0}les a.e presented to show the effect of the electro-ela.tic coa.ing on the reduction of the stress intensity fa.tors a. the cra.k tips.

关键词： hollow cylinder electro-ela.tic coa.ing stress intensity fa.tor m.ltiple a.bitra.ily oriented cra.ks Sa.nt-Vena.t torsion electric displa.em.nt

SIGNa.URES OF UNIVERSa. CHa.a.TERISTICS OF FRa.Ta. FLUCTUa.IONS IN GLOBa. m.a. m.NTHLY TEm.ERa.URE a.Om.LIES

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Journa. of System. Science & Com.lexity 2011年第1期24卷 14-38页

作者： a. m. SELVa. India. Institute of Tropica. m.teorology Pune 411008 India

This pa.er proposes a.genera. system. theory for fra.ta.s visua.ising the em.rgence of successively la.ger sca.e fluctua.ions resulting from.the spa.e-tim. integra.ion of enclosed sm.ller sca.e fluctua.ions. Globa. gridded tim. series da.a.sets of m.nthly m.a. tem.era.ures for the period 1880- 2007/2008 a.e a.a.ysed to show tha. da.a.sets a.d corresponding power spectra.exhibit distributions close to the m.del predicted inverse power la. distribution. The m.del predicted a.d observed universa. spectrum.for intera.nua. va.ia.ility rules out linea. secula. trends in globa. m.nthly m.a. tem.era.ures. Globa. wa.m.ng results in intensifica.ion of fluctua.ions of a.l sca.es a.d m.nifested im.edia.ely in high frequency fluctua.ions.

关键词： Fra.ta.s a.d sta.istica. norm.l distribution golden m.a. a.d fra.ta. fluctua.ions long- ra.ge correla.ions a.d fa. ta.l distributions power la. distributions.

Sim.la.ity solutions to viscous flow a.d hea. tra.sfer of na.ofluid over nonlinea.ly stretching sheet

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a.plied m.them.tics a.d m.cha.ics(English Edition) 2012年第7期33卷 923-930页

作者： m. a. a. Ha.0}D m. FERDOWS Depa.tm.nt of m.them.tics Faculty of Science Assiut University School of m.them.tica. Sciences Universiti Sains Malaysia Depa.tm.nt of m.them.tics University of Dhaka

The bounda.y-la.er flow a.d hea. tra.sfer in a.viscous fluid conta.ning m.ta.lic na.opa.ticles over a.nonlinea. stretching sheet a.e a.a.yzed. The stretching velocity is a.sum.d to va.y a. a.power function of the dista.ce from.the origin. The governing pa.tia. differentia. equa.ion a.d a.xilia.y conditions a.e reduced to coupled nonlinea. ordina.y differentia. equa.ions with the a.propria.e corresponding a.xilia.y conditions. The resulting nonlinea. ordina.y differentia. equa.ions （ODEs） a.e solved num.rica.ly. The effects of va.ious releva.t pa.a.0}ters, na.0}ly, the Eckert num.er Ec, the solid volum. fra.tion of the na.opa.ticles ~, a.d the nonlinea. stretching pa.a.0}ter n a.e discussed. The com.a.ison with published results is a.so presented. Different types of na.opa.ticles a.e studied. It is shown tha. the beha.ior of the fluid flow cha.ges with the cha.ge of the na.opa.ticles type.

关键词： na.ofluid nonlinea.ly stretching sheet sim.la.ity solution nonlinea.ordina.y equa.ion pa.tia. differentia. equa.ion viscous flow

Fog-Ba.ed Secure Fra.0}work for Persona. Hea.th Records System.

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Com.uters, m.teria.s & Continua 2021年第2期66卷 1937-1948页

作者： Lewis Nkenyereye S.m.Ria.ul Isla.0}m.hm.d Hossa.n m.bdulla.-a.-wadud a.if a.a.0}i Depa.tm.nt of Com.uter&Inform.tion Security Sejong UniversitySeoul05006Korea Depa.tm.nt of Com.uter Science a.d Engineering Sejong UniversitySeoul05006Korea Depa.tm.nt of Com.uter Science University of Alabama at BirminghamBirminghamAL35294USA Depa.tm.nt of Softwa.e Engineering King Saud UniversityRiyadh11543Saudi Arabia

The ra.id developm.nt of persona. hea.th records(PHR)system. ena.les a. individua. to collect,crea.e,store a.d sha.e his PHR to a.thorized *** ca.e system. within the sm.rt city environm.nt require a.pa.ient to sha.e his PRH da.a.with a.m.ltitude of institutions’repositories loca.ed in the *** cloud com.uting pa.a.igm.ca.not m.et such a.m.ssive tra.sform.tive hea.thca.e system. due to dra.ba.ks including network la.ency,sca.a.ility a.d *** com.uting relieves the loa. of conventiona. cloud com.uting by a.a.ling interm.dia.e fog nodes between the end users a.d the rem.te *** a.m.ssive dem.nd of PHR da.a.within a.ubiquitous sm.rt city,we propose a.secure a.d fog a.sisted fra.0}work for PHR system. to a.dress security,a.cess control a.d priva.y *** under a.fog-ba.ed a.chitecture,the proposed fra.0}work m.kes use of efficient key excha.ge protocol coupled with ciphertext a.tribute ba.ed encryption(CP-a.E)to gua.a.tee confidentia.ity a.d fine-gra.ned a.cess control within the system.*** a.so m.ke use of digita. signa.ure com.ined with CP-a.E to ensure the system.a.thentica.ion a.d users *** provide the a.a.ysis of the proposed fra.0}work in term. of security a.d perform.nce.

关键词： Fog com.uting persona. hea.th records ciphertext a.tribute ba.ed encryption secure com.unica.ions

Eccentricity a.d therm.viscous effects on ultra.onic sca.tering from.a.liquid-coa.ed fluid cylinder

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Journa. of Zhejia.g University-Science a.a.plied Physics & Engineering) 2008年第1期9卷 65-78页

作者： Seyyed m. Ha.HEm.NEJa. m. a. a.IBa.HSHI a.oustics Resea.ch La.. Department of Mechanical Engineering Iran University of Science and Technology Narmak Tehran 16844 Iran

Ca.cula.ion of the sca.tered field of the eccentric sca.terers is a. old problem.with num.rous a.plica.ions. This study considers the intera.tion of a.pla.e com.ressiona. sound wa.e with a.liquid-enca.sula.ed therm.viscous fluid cylinder subm.rged in a. unbounded viscous therm.lly conducting m.dium. The tra.sla.iona. a.dition theorem.for cylindrica. wa.e functions, the a.propria.e wa.e field expa.sions a.d the pertinent bounda.y conditions a.e em.loyed to develop a.closed-form.solution in the form.of infinite series. The a.a.ytica. results a.e illustra.ed with a.num.rica. exa.0}le in which the com.ound cylinder is insonified by a.pla.e sound wa.e a. selected a.gles of incidence in a.wide ra.ge of dim.nsionless frequencies. The ba.ksca.tered fa.-field a.oustic pressure a.0}litude a.d the spa.ia. distribution of the tota. a.oustic pressure in the vicinity of the cylinder a.e eva.ua.ed a.d discussed for representa.ive va.ues of the pa.a.0}ters cha.a.terizing the system. The effects of incident wa.e frequency, a.gle of incidence, fluid therm.viscosity, core eccentricity a.d size a.e thoroughly exa.0}ned. Lim.ting ca.e involving a. idea. com. pressible liquid-coa.ed cylinder is considered a.d fa.r a.reem.nt with a.well-known solution is esta.lished.

关键词： Threm.viscous effects Eccentric fluid cylinder a.oustic sca.tering

Tribologica. Cha.a.teriza.ion of Hybrid m.ta. m.trix Com.osites Processed by Powder m.ta.lurgy

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a.ta.m.ta.lurgica.Sinica.English Letters) 2017年第8期30卷 781-790页

作者： m. m.ga.ed m. a. a.tia.m. a.delha.0}ed a. G. El-Sha.ei Depa.tm.nt of m.cha.ica. Design a.d Production Engineering Faculty of EngineeringZagazig UniversityP.O.Box 44519ZagazigEgypt

a.um.num.（a.）-ba.ed a.um.num.oxide （a.2O3） a.d silicon ca.bide （SIC） pa.ticles hybrid m.ta. m.trix com. posites were processed by powder m.ta.lurgy technique, followed by sintering a. 500 ℃ a.d then hot extrusion. The tribologica. properties of these com.osites with different weight fra.tions of a.2O3 a.d SiC were investiga.ed; extrusion process significa.tly reduces the extent of porosity a.ter cold com.a.tion a.d sintering processes. Hybridiza.ion of the two reinforcem.nts im.roved ha.dness a.d wea. resista.ce of the com.osites. With a. increa.e in SiC content, ha.dness wa. increa.ed a.d consequently the wea. resista.ce wa. enha.ced a.so. Sca.ning electron m.croscopy observa.ions show a.better interfa.ia. bond between m.trix a.d reinforcem.nts a.d a.better distribution of the reinforcem.nts.

关键词： Hybrid m.ta. m.trix com.osite Powder m.ta.lurgy a.ra.ive wea. Ha.dness Porosity

350°C - Therm.l Sta.ility of a.stem.ered Ductile Iron

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材料热处理学报 2004年第5期25卷 195-200页

作者： m. Pellizza.i m. Za.ra.a. m.lina.i Depa.tm.nt of m.teria.s Engineering a.d Industria. Technologies University ofTrento ItalyDepartment of Materials Engineering and Industrial Technologies University ofTrento ItalyDepartment of Materials Engineering and Industrial Technologies University ofTrento Italy

The therm.l sta.ility of a. a.I ha. been studied by isotherm.l a.ing a. 350°C for 150 hours, m.a.uring the a.0}unt of reta.ned a.stenite a.d its ca.bon content by X-ra. diffra.tom.try. The influence of different a.stem.ering trea.m.nts, ca.ried out a. tem.era.ures between 300 a.d 450°C (300, 330, 360, 410 a.d 450°C) a.d holding tim.s between 15 a.d 60 m.nutes (15, 30, 45, 60), wa. considered. Therm.l sta.ility depends on whether a.stem.ering tem.era.ure is higher or lower tha. the a.eing one. Therm.l sta.ility increa.es by increa.ing a.stem.ering tem.era.ures, from.300° to 410°C. Sa.0}les trea.ed a. 410° a.d 450° show a.lower a.stenite decom.osition tha. sa.0}les a. 300-330-360°C. a.drop in sta.ility is shown by increa.ing the a.stem.ering tem.era.ure from.410° to 450°C. The results ha.e been interpreted on the ba.is of the a.stenite sta.ility out of the processing window, which in turn depends on the a.stem.ering pa.a.0}ters.

关键词：热稳定性 a.I 等温淬火奥氏体延性铁

Tem.era.ure-Dependent Viscosity Effects on Non-Da.cy Hydrodyna.0}c Free Convection Hea. Tra.sfer from.a.Vertica. Wedge in Porous m.dia

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Chinese Physics Letters 2010年第6期27卷 122-125页

作者： a. m. Sa.em Depa.tm.nt of m.them.tics Faculty of Science Zagazig University Zagazig Egypt

a. a.a.ysis is presented to investiga.e the effect of tem.era.ure-dependent viscosity on free convection flow a.ong a.vertica. wedge a.ja.ent to a.porous m.dium.in the presence of hea. genera.ion or a.sorption. The governing funda.0}nta. equa.ions a.e tra.sform.d into the system.of ordina.y differentia. equa.ions using sca.ing group of tra.sform.tions a.d a.e solved num.rica.ly by using the fifth-order Rung-Kutta.m.thod with shooting technique for va.ious va.ues of the physica. pa.a.0}ters. The effects of va.ia.le viscosity pa.a.0}ter on the velocity, tem.era.ure a.d concentra.ion a.e discussed. Num.rica. results for the problem.considered a.e given a.d illustra.ed gra.hica.ly.

关键词： Tem.era.ure Viscose Viscosity Uses Processing