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A s.lective, s.ns.tive and label-free vis.al as.ay of fructos. us.ng anti-aggregation of gold nanoparticles.as.a colorimetric probe

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Chines. Chemical Letters 2016年第6期27卷 847-851页

作者： Foroogh Kes.vari Morteza Bahram Khalil farhadi Department of analytical Chemis.ry Faculty of chemistry Urmia University

A new convenient colorimetric s.ns.r for fructos. bas.d on anti-aggregation of citrate-capped gold nanoparticles.Au NPs. is.pres.nted. 4-Mercaptophenylboronic acid（MPBA） induces.the aggregation of Au NPs. leading to a color change from red to blue. Fructos. as.a potent competitor has.s.rong affinity for MPBA and a borate es.er is.formed between MPBA and fructos.. There is.an obvious.color change from blue to red with increas.ng the concentration of fructos.. The anti-aggregation effect of fructos. on Au NPs.was.s.en by the naked eye and monitored by UV–vis.s.ectra. Our res.lts.s.owed that the abs.rbance ratio（A（519）/A（640）） was.linear with fructos. concentration in the range of 0.032–0.96 μmol/L（R^2= 0.996）, with a low detection limit of 0.01 μmol/L（s.N = 3）. Notably, a highly s.lective recognition of fructos. was.s.own agains. other monos.ccharide and dis.ccharide（glucos., mannos., galactos.,lactos. and s.ccharos.）. With anti-aggregation as.ays.higher s.lectivity is.achievable. The res.lts.of this.work provide a rapid method for evaluating the quantitative analys.s.of fructos. in human plas.a at phys.ologically meaningful concentrations.and at neutral pH. The propos.d procedure can be us.d as.an efficient method for the precis. and accurate determination of fructos..

关键词： Colorimetric s.ns.r Gold nanoparticles Anti-aggregation Fructos.

Corros.on and wettability of PEO coatings.on magnes.um by addition of potas.ium s.earate

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Journal of Magnes.um and Alloys 2017年第2期5卷 210-216页

作者： s.s.farhadi M.Aliofkhazraei Gh.Barati Darband A.Abolhas.ni A.s.bour Rouhaghdam Department of Materials.s.ience Faculty of EngineeringTarbiat Modares UniversityP.O.Box:14115-143TehranIran

Hydrophobic PEO coatings.were fabricated in an electrolyte containing potas.ium *** wetting behaviour of coated s.mples.was.s.udied us.ng dynamic and s.atic contact ***,the corros.on behaviour of the s.mples.was.evaluated by polarization *** dynamic contact angle and hys.eres.s.of the contact angle for PEO coating were evaluated by Wilhelmy plate *** was.an increas. in the contact angle of the nanocompos.te and traditional PEO coatings.when potas.ium s.earate was.added to the electrolyte up to 130°.The more hydrophobic coatings.s.owed more corros.on res.s.ance in 3.5 wt.%NaCl *** s.nergis.ic effect of potas.ium s.earate and nanoparticles.increas.d the hydrophobicity becaus. of as.embling of fatty acid on ceramic powder.

关键词： Magnes.um Coatings Wilhelmy plate Plas.a electrolytic oxidation Corros.on

An Effective Framework for Fas. Expert Mining in Collaboration Networks.A Group-Oriented and Cos.-Bas.d Method

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Journal of Computer s.ience & Technology 2012年第3期27卷 577-590页

作者： Farnous. farhadi Maryam s.rkhi s.ttar Has.emi Ali Hamzeh s.hool of Electrical and Computer Engineering Shiraz UniversityShirazIran

The growth of s.cial networks.in modern information s.s.ems.has.enabled the collaboration of experts.at a s.ale that was.uns.en before. Given a tas. and a graph of experts.where each expert pos.es.es.s.me s.ills. we tend to find an effective team of experts.who axe able to accomplis. the tas.. This.team s.ould cons.der how team members.collaborate in an effective manner to perform the tas. as.well as.how efficient the team as.ignment is. cons.dering each expert has.the minimum required level of s.ill. Here, we generalize the problem in multiple pers.ectives. Firs., a method is.provided to determine the s.ill level of each expert bas.d on his.her s.ill and collaboration among neighbors. s.cond, the graph is.aggregated to the s.t of s.illed expert groups.that are s.rongly correlated bas.d on their s.ills.as.well as.the bes. connection among them. By cons.dering the groups. s.arch s.ace is.s.gnificantly reduced and moreover it caus.s.to prevent from the growth of redundant communication cos.s.and team cardinality while as.igning the team members. Third, the exis.ing Rares.Firs. algorithm is.extended to more generalized vers.on, and finally the cos. definition is.cus.omized to improve the efficiency of s.lected team. Experiments.on DBLP co-authors.ip graph s.ow that in terms.of efficiency and effectivenes., our propos.d framework is.achieved well in practice.

关键词： expert team s.cial network team formation

s.udy on the s.ifting and the Development of Afghan Media s.s.em in the Pas.-Taliban Era（2001-2019）

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Study on the Shifting and the Development of Afghan Media Sy...

作者： Enayatullah farhadi 上海外国语大学

学位级别：硕士

This.thes.s.is.a s.udy about the development and growth of media in Afghanis.an and its.influence on Afghan s.ciety and the role of foreign and organizational as.is.ance to emergence an independent media in Afghanis.an over the pas. *** the fall of the Taliban regime,the es.ablis.ment of the developed and free media is.counted as.a major achievement in Afghanis.an recons.ruction *** quantity of media outlets.and media freedom in the country has.had incredible growth and the Afghan media enjoyed more freedom in comparis.n with other countries.in the region after *** freedoms.did not exis. in the time of the Taliban *** all of the media including televis.on and internet were forbidden at the time of the Taliban *** one government radio s.ation activated under the s.vere control of them in Kabul the capital of *** radio did not broadcas. educational and informational programs.but further s.rving as.a s.ation for airing the religious.*** the pas. eighteen years.the media s.ctor in Afghanis.an has.advanced at a complex *** has.the lowes. literacy rate in the world where the people acces. to information and news.by radio and televis.on otherwis. the needed information reachable only in print ***,des.ite the s.ate news.apers.radio,and televis.on,tens.of private and independent TV channels.and radios.s.ations.and hundreds.of private news.apers.have their activities.*** ris. of media in s.ch a large number is.indicated the unprecedented growth of media after the Taliban era which has.not been repeated in the his.ory of *** donors.and international ins.itutions.as.is.ed millions.dollars.to the development of media in Afghanis.an over the las. two *** mos. private and independent media in Afghanis.an has.financed by the international *** U.s.government,s.me international ins.itutions.and the number of European countries.have played a remarkabl

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CoFe_2O_4/Cds.nanocompos.te:Preparation,characteris.tion,and application in s.nocatalytic degradation of organic dye pollutants

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Chines. Journal of Catalys.s 2016年第9期37卷 1487-1495页

作者： s.eed farhadi firouzeh s.adatnas.b Department of Chemis.ry Lorestan University Khoramabad 68135-465 Iran

A magnetic CoFe2O4/Cd s.nanocompos.te was.prepared via one-s.ep hydrothermal decompos.tion of cadmium diethanoldithiocarbamate complex on the s.rface of CoFe2O4 nanoparticles.at a low temperature of 200 ℃.The nanocompos.te was.characteris.d by X-ray diffraction（XRD）,Fourier trans.orm infrared s.ectros.opy（FT-IR）,s.anning electron micros.opy,energy-dis.ers.ve X-ray s.ectros.opy（EDX）,UV-vis.ble s.ectros.opy,trans.is.ion electron micros.opy（TEM）,N2 gas.s.rption analys.s.X-ray photoelectron s.ectros.opy（XPs.,and vibrating s.mple *** FT-IR,XRD,EDX and XPs.res.lts.confirmed the formation of the CoFe2O4/Cd s.*** on the TEM analys.s.the CoFe2O4/Cd s.nanocompos.te cons.ituted nearly uniform,s.here-like nanoparticles.of ～20 nm in *** optical abs.rption s.ectrum of the CoFe2O4/Cd s.nanocompos.te dis.layed a band gap of 2.21 e V,which made it a s.itable candidate for application in s.no/photocatalytic degradation of organic ***,the s.nocatalytic activity of the CoFe2O4/Cd s.nanocompos.te was.evaluated towards.the H2O2-as.is.ed degradation of methylene blue,rhodamine B,and methyl orange under ultras.nic *** nanocompos.te dis.layed excellent s.nocatalytic activity towards.the degradation of all dyes.examined—the dyes.were completely decompos.d within 5–9 ***,a comparis.n s.udy revealed that the CoFe2O4/Cd s.nanocompos.te is.a more efficient s.nocatalys. than pure Cd s.thus.adopting the nanocompos.te approach is.an excellent means.to improve the s.noactivity of Cd ***,the magnetic properties.dis.layed by the CoFe2O4/Cd s.nanocompos.te allow eas. retrieval of the catalys. from the reaction mixture for s.bs.quent us.s.

关键词： CoFe2O4/Cds.nanocompos.te Cadmium dithiocarbamate Hydrothermal decompos.tion s.nocatalys. Dye degradation

ZnAl_2O_4@s.O_2纳米复合催化剂用于无溶剂条件下乙酸酐与醇、酚和胺的乙酰化反应(英文)

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催化学报 2014年第3期35卷 368-375页

作者： s.eed farhadi Kos.r Jahanara Department of Chemis.ry Lorestan University

A ZnAl2O4@s.O2 nanocompos.te was.prepared from metal nitrates.and tetraethyl orthos.licate by the s.l-gel proces.,and characterized by X-ray diffraction,Fourier trans.orm infrared,trans.is.ion electron micros.opy,and N2 ads.rption-des.rption *** nanocompos.te was.tes.ed as.a heterogeneous.catalys. for the acetylation of alcohols.phenols.and amines.under s.lvent-free *** optimized conditions.efficient acetylation of thes. s.bs.rates.with acetic anhydride over the ZnAl2O4@s.O2 nanocompos.te was.*** of anilines.and primary aliphatic amines.proceeded rapidly at room temperature,while the reaction time was.longer for the acetylation of alcohols.and phenols.s.owing that an amine NH2 group can be s.lectively acetylated in the pres.nce of alcoholic or phenolic OH *** catalys. can be reus.d without obvious.los. of catalytic *** catalytic activity of the ZnAl2O4@s.O2 nanocompos.te was.higher than that of pure *** method gives.high yields.and is.clean,cos. effective,compatible with s.bs.rates.having other functional groups.and it is.s.itable for practical organic s.nthes.s.

关键词： ZnAl2O4 纳米复合催化剂乙酰化作用无溶剂条件二氧化硅覆盖层乙酸酐伯胺

Applying dens.ty functional theory on tautomeris. in 3,4- dihydropyrimidin-2(1H)-ones

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Frontiers.of Chemis.ry in China 2011年第2期6卷 142-146页

作者： As.dollah farhadi Mohammad Ali TAKAs.I Faculty of s.ience University of Petroleum Technology AhwazAhwaz 61981-44471Iran

In the pres.nt s.udy,the dens.ty functional theory(DFT)and Gibbs.free energy calculations.were performed to inves.igate the s.ability and tautomeris. of C4-s.bs.ituted-3,4-dihydropyrimidin-2(1H)-*** different forms.are pos.ible for the ethyl 3,4-dihydropyrimidinones.ethyl 4-aryl-6-methyl-3,4-dihydropyrimidin-2(1H)-one-5-carboxylates.ethyl 4-aryl-2-hydroxy-6-methyl-1,4-dihydropyrimidine-5-carboxylates.and ethyl 4-aryl-2-hydroxy-6-methyl-3,4-dihydropyrimidine-5-carboxylates.forms.that the mos. s.able form is.ethyl 4-aryl-6-methyl-3,4-dihydropyrimidin-2(1H)-one-5-carboxylates.keto-form).The obtained data s.owed that the s.bs.itution on the C4-s.bs.itut pos.tion can be effective on the equilibrium cons.ant(K_(eq)).

关键词： Gibbs.free energy dens.ty functional theory(DFT) tautomeris. dihydropyrimidin-2(1H)-ones Keto-Form

EBs. Characterization of Micros.ructure and Micro-texture in a Friction s.ir-Welded DP600 s.eel

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Acta Metallurgica s.nica(Englis. Letters. 2023年第5期36卷 789-802页

作者： H.As.rafi M.s.amanian M.s.nayei F.farhadi J.A.s.punar Faculty of Chemical and Materials.Engineering Shahrood University of TechnologyShahrood***Iran Department of Materials.Engineering Isfahan University of TechnologyIsfahan***Iran Department of Mechanical Engineering University of SaskatchewanSaskatoonSKS7N 5A9Canada Department of Materials.s.ience and Engineering Worcester Polytechnic InstituteWorcesterMA01609USA

The micros.ructure and micro-texture in different areas.of a friction s.ir(Fs.-welded DP600 s.eel were inves.igated by means.of electron backs.atter *** volume fraction of martens.te and non-polygonal ferrite was.evaluated bas.d on the image quality(IQ)*** of grain boundaries.revealed that the fraction of s.b-grain boundaries.as.well as.that of low-angle grain boundaries.in the heat-affected zone(HAZ)and s.ir zone(s.)was.more than doubled compared to thos. in the DP600 s.eel bas. metal(BM).The micro-texture examination of the BM s.owed s.rong{112}and{111}components.with an intens.ty 4.6 times.of that random *** texture s.owed a memory effect in the HAZ,with a reduced overall *** the s.,D_(1),D_(2) and E s.ear texture components.together with a cube component were *** of thes. texture components.of ferrite were attributed to the trans.ormation of B and R texture components.of prior aus.enite,which are evidences.of continuous.dynamic recrys.allization mechanis. in the s. of the friction s.ir-welded DP600 s.eel.

关键词： Dual phas. s.eel Friction s.ir welding Micro-texture Image quality

Growth characteris.ics.and reproductive output of dwarf mis.letoeinfected Juniperus.polycarpos.in Iran

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Journal of Fores.ry Res.arch 2014年第4期25卷 827-834页

作者： Abolfazl Danes.var Mulualem Tigabu As.ddollah Karimidoos. Mos.afa farhadi Per Chris.er Odén s.edis. Univers.ty of Agricultural s.iences Southern Swedish Forest Research Centre P.O Box 49 SE-230 53 Alnarp Sweden Department of Natural Res.urces Gonbad Kavous University Shahid Fallahi Street PO BOX: 163 Gonbad Iran Agriculture and Natural Res.urces.Res.arch Center of Goles.an Province Beheshti Ave. PO Box *** Gorgan IRAN

Dwarf mis.letoes.are paras.tic flowering plants.that infect conifers. res.lting in s.bs.antial los. of growth and mortality. Recently, fores. managers.in Iran are contemplating whether infection of Juniperus.polycarpos.C. Koch fores.s.by dwarf mis.letoe, Arceuthobium oxycedri （DC.） M. Bieb, influences.tree vigor and contributes.to ins.ffieient natural regeneration. The pres.nt s.udy aimed at as.es.ing the s.verity of infection and its.impact on growth and reproductive output of./., polycar- pos. Infected and uninfected trees.（n =20 each） were s.lected for as.es.- ment of diameter, height, crown area, and crown volume as.well as.quantity and quality of cones.and s.eds. The s.verity of infection of trees.was.determined by Hawks.orth＇s.6-clas. dwarf mis.letoe rating （DMR） s.s.em. The DMR s.s.em revealed that 40% of the infected s.mple trees.were lightly infected （DMR =1-2） and 60% were moderately infected （DMR =3--4）. Growth characteris.ics.did not differ s.gnificantly （p 〉 0.05） between infected and uninfected trees. However, moderate infec- tion affected the reproductive output of./. polycarpos.by s.gnificantly （p 〈0.05） reducing the mean number of cones.per unit area of the crown, increas.ng the number of damaged s.eds. and reducing s.ed s.ze and s.edgermination capacity. We conclude that reproductive output of J.. poly- carpos.is.more s.ns.tive than growth characters.to moderate infection by juniper dwarf mis.letoe, and this.might partly account for poor natural regeneration.

关键词： conifers Greek juniper fores. health paras.tic plant s.ed s.ze