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Microstructura. Evolution of NiTi47.7Cu6.3 a.loy during Hot Deforma.ion

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Journa. of Ma.eria.s Science & Technology 2011年第10期27卷 951-960页

作者： amir Eta.ti Ka.ra. dehghani Mining a.d Meta.lurgica. Eng.Dept. Amirkabir Univ.Tech.

In the present work, the hot worka.ility a.d microstructura. evolution of ***6.3 （a..%） sha.e memory a.loy were investiga.ed by using wedge-rolling test. The wedge specimens were subjected to hot rolling a. the tempera.ures of 700-1000℃. The microstructura. evolutions a. the stra.ns of 0.05, 0.15, 0.2, 0.25 a.d 0.3 were then cha.a.terized by optica. microscopy a.d sca.ning electron microscopy （SEM） a. well a. energy dispersive spectrometry （EDS） technique. Depending on the deforma.ion tempera.ure a.d stra.n, the dyna.ic recrysta.liza.ion （DRX） could occur, lea.ing to the refining of the microstructure. a. low tempera.ures of 700 a.d 800℃ there wa. no sign of DRX a. a.l studied stra.ns. a. these tempera.ures, the formed fine needle-like precipita.es pinned the gra.n bounda.ies a.d prevented them from bulging/migra.ion. By contra.t, a. higher tempera.ures of 900 a.d 1000℃, the DRX took pla.e a. the critica. stra.ns lower tha. 0.25 a.d 0.15, respectively. However, a. higher tempera.ures, stra.n-induced-bounda.y-migra.ion （SIBM） mecha.ism resulted in the forma.ion of DRX gra.ns.

关键词： Deforma.ion Wedge rolling test Dyna.ic recrysta.liza.ion Ni-rich Nitinol NiTiCu

Spa.ia. Va.ia.ility of Soil Orga.ic Ca.bon in Different Hillslope Positions in Tosha. a.ea. Golesta. Province, Ira.: Geosta.istica. a.proa.hes

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Journa. of Mounta.n Science 2015年第6期12卷 1422-1433页

作者： a.olfa.l Ba.ERI Fa.ha. KHORMa.I Fa.sha. KIa.I amir a.ma. dehghani Dept. of Soil Science Gorgan University of Agricultural Sciences and Natural Resources Dept. of Wa.er Engineering Gorgan University of Agricultural Sciences and Natural Resources

a.cessibility to orga.ic ca.bon(OC) budget is required for susta.na.le a.ricultura. development a.d ecosystem preserva.ion a.d restora.ion. Using geosta.istica. models to describe a.d demonstra.e the spa.ia. va.ia.ility of soil orga.ic ca.bon(SOC) will lea. to a.grea.er understa.ding of this dyna.ics. The a.m of this pa.er is to present the rela.ionships between the spa.ia. va.ia.ility of SOC a.d the topogra.hic fea.ures by using geosta.istica. methods on a.loess mounta.n-slope in Tosha. region, Golesta. Province, northern Ira.. Hence, 234 soil sa.ples were collected in a.regula. grid tha. covered different pa.ts of the slope. The results showed tha. such fa.tors a. silt, cla., sa.ura.ed moisture content, mea. weighted dia.eter(MWD) a.d bulk density were a.l correla.ed to the OC content in different slope positions, a.d the spa.ia. va.ia.ility of SOC more to slope positions a.d eleva.ions. The coefficient of va.ia.ion(CV) indica.ed tha. the va.ia.ility of SOC wa. modera.e in different slope positions a.d for the mounta.n-slope a. a.whole. However, the higher va.ia.ility of SOC(CV = 45.6%) wa. shown in the ba.k-slope positions. a.so, the ordina.y cokriging method for cla. a. cova.ia.t ga.e better results in eva.ua.ing SOC for the whole slope with the RMSE va.ue 0.2552 in compa.ison with the kriging a.d the inverse dista.ce weighted(IDW) methods. The interpola.ion ma. of OC for the slope under investiga.ion showed lowering SOC concentra.ions versus increa.ing eleva.ion a.d slope gra.ient. The spa.ia. correla.ion ra.io wa. different between va.ious slope positions a.d rela.ed to the topogra.hic texture.

关键词：空间变异性土壤有机碳地统计学方法山地位置伊朗坡面地质

Investiga.ing the potentia. of using a.oustic frequency on the degra.a.ion of linea. a.kylbenzen sulfona.es from a.ueous solution

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Journa. of Zhejia.g University-Science a.a.plied Physics & Engineering) 2007年第9期8卷 1462-1468页

作者： dehghani Moha.ma. Ha.i Ma.VI amir Hossein Na.a.POOR a.i a.gha. a.a. Ka.a. Depa.tment of Environmenta. Hea.th Engineering School of Public HealthCenter for Environmental ResearchMedical Sciences/University of TehranTehranI.R. Iran Depa.tment of Environmenta. Hea.th School of Public HealthMashhad University of Medical SciencesMashhadI.R. Iran Depa.tment of Epidemiology a.d Biosta.istics School of Public HealthMedical Sciences/University of TehranTehranI.R. Iran

The effectiveness of using a.oustica. (sonochemica.) rea.tor for degra.a.ion of linea. a.kylbenzen sulfona.e (La.) from a.ueous solution wa. investiga.ed. La.s a.e a.ionic surfa.ta.ts,found in rela.ively high a.ounts in domestic a.d industria. wa.tewa.ers. In this study,experiments on La. solution were performed using methylene blue a.tive substa.ces (MBa.) method. The effectiveness of a.oustica. processor rea.tor for La. degra.a.ion is eva.ua.ed with empha.is on the effect of trea.ment time a.d initia. La. concentra.ion. Experiments were performed a. initia. concentra.ions of 0.2,0.5,0.8 a.d 1.0 mg/L,a.oustic fre-quency of 130 kHz,a.plied power of 500 W a.d tempera.ure of 18 °C～20 °C. a. the conditions involved,La. degra.a.ion wa. found to increa.e with increa.ing sonochemica. time. In a.dition,a. the concentra.ion increa.ed,the La. degra.a.ion ra.e de-crea.ed in the a.oustica. processor rea.tor.

关键词：声学电抗器烷基苯磺酸盐声学频率电压声化学

Eva.ua.ion of suspended loa. tra.sport ra.e using tra.sport formula. a.d a.ti- ficia. neura. network models (Ca.e study: Chelcha. Ca.chment)

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Journa. of Hydrodyna.ics 2013年第3期25卷 459-470页

作者： Ha.Da.CHI a.ma. MOVa.EDI Nesha. Va.IDI Elha. OMID Moha.ma. Hossein dehghani amir a.ma. a.stra.ia. Rivers Institute Griffith University Nathan QLD 4111 Australia Depa.tment of Wa.er Engineering Gorgan University of Agricultural Sciences and Natural Resources GorganIran Depa.tment of Irriga.ion a.d Recla.a.ion Engineering University of Tehran Karaj Iran

a.cura.e estima.ion of sediment loa. or tra.sport ra.e is very importa.t to a.wide ra.ge of wa.er resources projects. This study wa. underta.en to determine the most a.propria.e model to predict suspended loa. in the Cheleha. Wa.ershed, northea.t of Ira.. In tota., 59 da.a.series were collected from four gra.el bed-rivers a.d a.sa.d bed river a.d two depth integra.ing suspended loa. sa.plers to eva.ua.e nine suspended loa. formula. a.d feed forwa.d ba.kpropa.a.ion a.tificia. Neura. Network （a.N） structures. a.though the Cha.g formula.with higher correla.ion coefficient （r = 0.69） a.d lower Root Mea. Squa.e Error （RMSE = 0.013） is the best suspended loa. predictor a.ong the nine studied formula., the a.N models significa.tly outperform tra.itiona. suspended loa. formula. a.d show their superior performa.ce for a.l sta.istica. pa.a.eters. a.ong different a.N structures two models inclu- ding 4 inputs, 4 hidden a.d one output neurons, a.d 4 inputs, 4 a.d one hidden a.d one output neurons provide the best simula.ion with the RMSE va.ues of 0.0009 a.d 0.001, respectively.

关键词： sediment tra.sport suspended loa. formula. a.tificia. Neura. Network (a.N) river engineering

Investiga.ion a.d eva.ua.ion of ultra.ound rea.tor for reduction of fungi from sewa.e

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Journa. of Zhejia.g University-Science B(Biomedicine & Biotechnology) 2007年第7期8卷 493-497页

作者： dehghani Moha.ma. Ha.i Ma.VI amir Hossein Ja.ED Ghola. Reza.SHEIKHI Ra.ieh Depa.tment of Environmenta. Hea.th Engineering School of Public Health Medical Sciences/University of Tehran P.O. Box 14155-6145 Tehran I.R. Iran

The objective of the investiga.ion wa. to study the a.plica.ion of ultra.ound rea.tor technology (USRT) a. a.disin-fecta.t for reduction of fungi from sewa.e effluent. Fungi a.e ca.bon heterotrophs tha. require preformed orga.ic compounds a. ca.bon sources. USRT is a. a.tra.tive mea.s to improve wa.er qua.ity beca.se of the system simplicity a.d no production of toxic by-products. a. ultra.ound rea.tor produces strong ca.ita.ion in a.ueous solution ca.sing shock wa.es a.d rea.tive free ra.ica.s by the violent colla.se of the ca.ita.ion bubble. These effects should contribute to the physica. disruption of microbia. structures a.d ina.tiva.ion of orga.isms. There wa. significa.t reduction in funga. growth, with decrea.ed funga. growth with increa.ing USRT. In this study, ultra.ound irra.ia.ion a. a.frequency of 42 kHz wa. used to expose suspensions of fungi to eva.ua.e the disinfection effica.y of the ultra.ound rea.tor. a.so, this study showed tha. in this system more tha. 99% reduction of sewa.e fungi wa. a.hieved a.ter 60 min.

关键词：污水超声因子气穴现象频率

Effect of Hot Working on Seconda.y Pha.e Forma.ion in 2205 Duplex Sta.nless Steel

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Journa. of Ma.eria.s Science & Technology 2010年第9期26卷 851-857页

作者： a.Momeni K.dehghani Depa.tment of Mining a.d Meta.lurgy Amir Kabir University of Technology

In this resea.ch,a.ing trea.ments a. tempera.ures of 800 a.d 900°C for different a.ing time of 5-60 min were conducted on solution trea.ed a. well a. hot worked sa.ples of 2205 dua. pha.e sta.nless *** effect of a.ing trea.ment on precipita.ion of intermeta.lic pha.es wa. investiga.ed in undeformed specimens a.d those subjected to hot deforma.ion with different stra.n ra.es of 0.001-1 *** wa. found tha. σ precipita.ion increa.ed by hot *** wa. a.so concluded tha. the volume fra.tion of pha.e increa.ed with deforma.ion tempera.ure a.d decrea.ed with stra.n *** precipita.ion of intermeta.lic pha.es（i.e.σ a.d χ） wa. a.a.yzed by a. a.ra.i-type kinetics equa.ion of %（σ＋χ）=a.1-exp（-ktn）） a.d the va.ues of n a.d ln k were estima.ed for different thermomecha.ica. *** va.ues of n were a.sessed to increa.e from 0.4 to 1 with stra.n ra.e in the studied ***,It wa. a.so understood tha. ln k decrea.ed with stra.n *** observa.ions by mea.s of optica. microscopy a.d sca.ning electron microscopy showed tha. σ pa.ticles mostly nuclea.ed a. the ferrite-a.stenite *** no sign of χ-pha.e could be *** fortified the idea.of certa.n litera.ure tha. χ-pha.e a.wa.s forms a. ea.ly sta.es of a.ing a.d consumes through the precipita.ion of σ.

关键词： Duplex sta.nless steel a.ing Hot working σ pha.e

Effect of a.ing Time a.d Tempera.ure on Mecha.ica. Properties a.d Microstructura. Evolution of 2205 Ferritic-a.stenitic Sta.nless Steel

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Journa. of Ma.eria.s Science & Technology 2009年第5期25卷 597-602页

作者： H.Keshmiri a.Momeni K.dehghani G.R.Ebra.imi G.Heida.i Esfa.a.en Steel Complex Depa.tment of Mining a.d Meta.lurgy Amir Kabir University of Technology Ta.bia. Moa.em University of Sa.zeva.

Duplex sta.nless steels （DSS） with ferritic-a.stenitic microstructures offer good combina.ion of resista.ce to pitting corrosion a.d high strength tha. a.e not concomita.tly a.ta.na.le using conventiona. single pha.e a.stenitic or ferritic sta.nless steels, The DSS used in this investiga.ion wa. 2205 a.loy ha.ing a.sta.le microstructure consisting of a.out 45% ferrite a.d 55% a.stenite a. a.bient tempera.ure. In order to investiga.e a.ing beha.ior of this steel a.d the influences on mecha.ica. properties, different a.ing trea.ments were conducted a. tempera.ures of 350-950℃ for va.ious a.ing time of 15, 30, 60 a.d 180 min. The a.ed specimens were subjected to impa.t testing a.d ha.dness mea.urements. Fina.ly, the cha.ges in microstructure due to a.ing were studied by optica. a.d sca.ning electron microscopy. The results showed tha. a.ing a. tempera.ures lower tha. 550℃ for different time ha. negligible effects on mecha.ica. properties. Besides, no considera.le cha.ges in term of precipita.ion of ha.mful intermeta.lic pa.ticles were observed in microstructure below this tempera.ure. However, a.critica. tempera.ure ra.ge, 550-650 ℃, wa. introduced here. a.ing in this ra.ge led to a.significa.t decrea.e in toughness a.d nota.le increa.e in ha.dness. The forma.ion of intermeta.lic pha.es such a. CT wa. recognized a. the ma.or rea.on for the observed cha.ges.

关键词： Duplex sta.nless steel a.ing Toughness Sigma.pha.e

a.gioid Strea.s in Psuedoxa.thoma.Ela.ticum

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Open Journa. of Ophtha.mology 2017年第1期7卷 57-63页

作者： Mehrda. Moha.ma.pour Na.a.in Ebra.imia.ib Seyed a.i Ta.a.a.a.i Moha.ma. Soleima.i Shima.dehghani Fa.emeh a.di Gha.em Sa.edi a.a.i amir Ha.a. Ma.ini Ma.ya. Noorba.hsh Za.ra.Ghomi Eye Resea.ch Center Farabi Eye Hospital Tehran University of Medical Sciences Tehran Iran Sha.id Beheshti Hospita. Kashan University of Medical Sciences Kashan Iran

Pseudoxa.thoma.ela.ticum (PXE) is a.heredita.y disorder tha. a.fects prima.ily the ela.tic tissues of skin, eyes a.d blood vessels. Its estima.ed preva.ence is thought to be 1:25,000 - 100,000. PXE pa.ients a.so ca.ry a. increa.ed risk for ca.diova.cula. a.d ga.trointestina. disea.es. Ea.ly dia.nosis ca. pla. a.crucia. role in preventing ea.ly loss of vision a.d systemic complica.ions in these pa.ients however despite ha.ing cha.a.teristic clinica. fea.ures;it is still to a.la.ge extent being under-dia.nosed. Here we present two ca.es of PXE with reduced vision.

关键词： Pseudoxa.thoma Ela.ticum (PXE) a.gioid Strea.s Drusen