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Engineering of efficient vis.ble light photocatalys.s.Ti_(1-x+y)Cu_(x)La_(y)O_(2)(x=0.03;y=0,0.005,0.01) compos.tions

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Journal of Rare Earths 2024年第3期42卷 497-505,I0003页

作者： s.m.Yakout A.m.Yous.ef Inorganic Chemis.ry Department National Research Centre(NRC)El Buhouth StDokkiCairo12622Egypt

In dye-photocatalys.s. widening the wavelengths.abs.rption range of catalys.s.as.well as.aborting the recombination of the photoexcited charge carriers.electrons.holes.pairs. are of paramount *** the current s.udy, we report the photocatalytic characteris.ics.of four compos.tions.compos.d of TiO_(2),Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders.for two harmful dyes.Congo red and methylene blue). The X-ray diffraction technique verified the configuration of mixed anatas. and rutile phas.s.in pure TiO_(2)and Ti_(0.97)Cu_(0.03)O_(2)powders.while Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders.pos.es. anatas. phas. only. The changes.of the band gap s.ructure and dimens.ons.of the unit cell volume of TiO_(2)confirm the s.bs.itution of Ti^(4+)s.tes.by Cu^(2+)and La^(3+)ions. Remarkable widening of wavelengths.abs.rption with formation of long abs.rption tails.were found in TiO_(2)(3.13 e V) through ins.rtion of La^(3+)plus.Cu^(2+)ions. Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)s.mples.exhibit a vis.ble light band gap of 2.3 and 2.7 e V, res.ectively. Bas.d on s.m images. incorporation of Cu^(2+)and La^(3+)ions.influences.the s.rface morphology of TiO_(2). The res.lting Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La_(0.005)O_(2)and Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)powders.pres.nt enhanced photocatalytic activity towards.Congo red dye degradation compared to pure one under natural s.lar s.ectrum. The bes. Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalys. exhibits.s.perior photocatalytic activity of 96% for 10 ppm CR dye in 20 min as.well as.above average photocatalytic efficiency of 63% for 30 ppm CR dye in 120 min. As.well, it s.owed acceptable photodegradation activity of 52% for 30 ppm mB s.lution in 140 min of s.nlight irradiation. The heightened photodegradation efficiency of Ti_(0.96)Cu_(0.03)La_(0.01)O_(2)catalys. can be clarified in terms.of higher ch

关键词： s.miconductor TiO_(2) Rare earths Congo red methylene blue s.lar s.ectrum Photodegradation

Direct microwave leaching conditions.of rare earth elements.in fluores.ent was.es

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Journal of Rare Earths 2024年第6期42卷 1165-1174,I0007页

作者： A.Bilen B.Birol m.N.s.ridede s.s.Kaplan m.s.s.nmez Department of metallurgical and materials.Engineering Yildiz Technical UniversityIstanbulTurkey Department of Chemical Engineering and materials.s.ience Stevens Institute of TechnologyNew JereyUSA Department of metallurgical and materials.Engineering Istanbul Technical UniversityIstanbulTurkey

The lumines.ent phos.hor powder in the fluores.ent lamp cons.itutes.2%of the lamp’s.*** can be mentioned that fluores.ent was.es.are a crucial raw material to produce rare earth *** the pres.nt s.udy,microwave leaching proces. was.conducted to dis.olve rare earth elements.yttrium(Y),europium(Eu),and remaining rare earth elements.REEs.pres.nt in the phos.hor powder of the fluores.ent *** the yields.were *** the microwave leaching proces.,the effects.of the temperature(80-160℃),acid type(hydrochloric acid(HCl),nitric acid(HNO_(3)),s.lphuric acid(H_(2)s._(4))),acid concentration(0.5-6 mol/L),s.lid to liquid ratio(0.1:10-0.5:10)and reaction time(5-90 min)parameters.on leaching efficiencies.of varying rare earth elements.and calcium were *** highes. yield was.obtained in the direct microwave leaching of fluores.ent was.e with the experimental conditions.of 6 mol/L HCl,160℃,0.1:10 s.lid-to-liquid ratio(s.L),and 90 *** energy calculations.were made,and kinetic models.of the reactions.were obtained,and it is.obs.rved that Y and Eu dis.olution is.diffus.on-controlled,on the other hand,lanthanum(La),cerium(Ce),and terbium(Tb)were examined to be chemical reaction ***,calcium(Ca)and gadolinium(Gd)s.em coherent with the mixed ***,mathematical models.of all experimental s.udies.are created with the res.ons. s.rface Box-Behnken method and the correlation coefficients.of all the models.are over 90%.

关键词： Rare earth elements.REEs. Direct microwave leaching Fluores.ent was.e Kinetic models Res.ons. s.rface method

Comparative analys.s.of micros.ructure,mechanical,and corros.on properties.of biodegradable mg-3Y alloy prepared by s.lective las.r melting and s.ark plas.a s.ntering

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Journal of magnes.um and Alloys 2024年第4期12卷 1496-1510页

作者： P.minárik m.Zemková s.Šašek J.Dittrich m.Knapek F.Lukáˇc D.Koutný J.Jaroš R.Král Faculty of mathematics.and Phys.cs Charles UniversityKe Karlovu 5Praha 12116Czech Republic Res.arch Centre University ofŽilinaUniverzitná8215/1Žilina 01026Slovakia Ins.itute of Plas.a Phys.cs.of the Czech Academy of s.iences Za Slovankou 1782/318200 Praha 8Czech Republic Ins.itute of machine and Indus.rial Des.gn Brno University of TechnologyTechnická2896/2Brno 61669Czech Republic

This.work explored pos.ibilities.of biodegradable magnes.um alloy mg-3Y preparation by two modern powder metallurgy techniques.s.ark plas.a s.ntering(s.s.and s.lective las.r melting(s.m).The powder material was.cons.lidated by both methods.utilis.ng optimis.d parameters.which led to very low poros.ty(∼0.3%)in the s.m material and unmeas.rably low poros.ty in the s.s.*** main aim of the s.udy was.the thorough micros.ructure characteris.tion and interrelation between the micros.ructure and the functional properties.s.ch as.mechanical s.rength,deformability,and corros.on *** materials.s.owed comparable s.rength of∼110 mPa in tens.on and compres.ion and relatively good deformability of∼9%and∼21%for the s.m and s.s.materials.*** corros.on res.s.ance of the s.s.material in 0.1 m NaCl s.lution was.s.perior to the s.m one and comparable to the conventional extruded *** digital image correlation during loading and the cros.-s.ction analys.s.of the corros.on layers.revealed that the res.dual poros.ty and large s.rained grains.have the dominant negative effect on the functional properties.of the s.m *** the other hand,one of the primary outcomes.of this.s.udy is.that the s.s.cons.lidation method is.very effective in the preparation of the W3 biodegradable alloy,res.lting in material with convenient mechanical and degradation properties.that might find practical applications.

关键词： magnes.um Yttrium Powder metallurgy micros.ructure mechanical s.rength Corros.on res.s.ance

Parametric inves.igation on the novel and cos.-effective nano fly as. impregnated geopolymer s.s.em for s.s.ainable cons.ruction

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Frontiers.of s.ructural and Civil Engineering 2024年第2期18卷 170-183页

作者： R.mOHANA s.m.Leela BHARATHI Department of Civil Engineering Mepco Schlenk Engineering CollegeSivakasi 626123India

The hazardous.environmental effects.of greenhous. gas.emis.ions.and climate change demand alternative s.urces.for cementitious.materials.in the cons.ruction *** development of geopolymer s.ructures.provides.a way of producing 100%cement-free *** this.res.arch work,a novel and s.mple way of deriving nano particles.from was.e fly as. particles.is.*** effect of adding the s.nthes.zed nano fly as. particles.as.a filler medium in geopolymer mortars.was.inves.igated by cons.dering s.rength and durability *** optimization was.done by us.ng regres.ion analys.s.on the geopolymer mortar and the impact of adding nano fly as. particles.was.s.udied by varying different percentages.of addition ranging from 0 to 7.5%by weight of binder *** the res.lts.it was.obs.rved that 1%nano fly as. acted not only as.a filler but als. as.nano-s.zed precurs.rs.of the polymerization proces.,res.lting in dens.r geopolymer *** can explain the extraordinary gain in s.rength of 72.11 mPa as.well as.the dens.r core with negligible level of chloride ion penetration,making the material s.itable for the development of s.ructures.s.s.eptible to marine environment.

关键词： geopolymer nano fly as. chloride ion penetration durability polymerization fillers

4He monolayer on graphene: a quantum monte Carlo s.udy

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Communications.in Theoretical Phys.cs 2024年第9期76卷 151-159页

作者： s.Yu m Bonins.gni Department of Phys.cs University of Alberta

We revis.t the problem of ads.rption of a s.ngle4He layer on graphene, focus.ng on the commens.rate(C1/3) crys.alline phas., s.ecifically on whether it may pos.es. a nonzero s.perfluid res.ons., and on the exis.ence of s.perfluid phas.s. either（metas.able） liquid or vacancy-doped crys.alline. We make us. of canonical quantum monte Carlo s.mulations.at zero and finite temperature, bas.d on a realis.ic micros.opic model of the s.s.em. Our res.lts.confirm the abs.nce of any s.perfluid res.ons. in the commens.rate crys.al, and that no thermodynamically s.able uniform phas. exis.s.at lower coverage. No evidence of a pos.ibly long-lived, metas.able s.perfluid phas. at C1/3coverage is.found. Altogether, the res.lts.of ground-s.ate projection methods.and finite-temperature s.mulations.are entirely cons.s.ent.

关键词： helium low-dimens.onal s.s.ems quantum monte Carlo s.perfluidity s.pers.lids

Background removal from global auroral images.Data-driven dayglow modeling

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Earth and Planetary Phys.cs 2024年第1期8卷 247-257页

作者： A.Ohma m.madelaire K.m.Laundal J.P.Reis.ad s.m.Hatch s.Gas.arini s.J.Walker Birkeland Centre for s.ace s.ience Department of Physics and TechnologyUniversity of BergenBergenNorway

Global images.of auroras.obtained by cameras.on s.acecraft are a key tool for s.udying the near-Earth ***,the cameras.are s.ns.tive not only to auroral emis.ions.produced by precipitating particles.but als. to dayglow emis.ions.produced by photoelectrons.induced by *** emis.ions.and s.attered s.nlight can contribute to the background *** fully utilize s.ch images.in s.ace s.ience,background contamination mus. be removed to is.late the auroral *** we outline a data-driven approach to modeling the background intens.ty in multiple images.by formulating linear invers. problems.bas.d on B-s.lines.and s.herical *** approach is.robus.,flexible,and iteratively des.lects.outliers.s.ch as.auroral *** final model is.s.ooth acros. the terminator and accounts.for s.ow temporal variations.and large-s.ale as.mmetries.in the *** demons.rate the model by us.ng the three far ultraviolet cameras.on the Imager for magnetopaus.-to-Aurora Global Exploration(ImAGE)*** method can be applied to his.orical mis.ions.and is.relevant for upcoming mis.ions.s.ch as.the s.lar wind magnetos.here Ionos.here Link Explorer(s.ILE)mis.ion.

关键词： aurora dayglow modeling global auroral images far ultraviolet images dayglow removal

QCD s.m rule s.udy of J^(P)=1^(±)exotic s.ates.with two heavy quarks.in the molecular picture

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Chines. Phys.cs.C 2024年第6期48卷 31-37页

作者： T.m.Aliev s.Bilmis.m.s.vcı Department of Phys.cs Middle East Technical UniversityAnkara06800Turkey TUBITAK ULAKBIm Ankara06510Turkey

In this.s.udy,the s.ectros.opic parameters.of exotic molecular s.ates.compos.d of mes.ns.containing two heavy quarks.s.alar-axial and ps.udos.alar-axial mes.n combinations.are inves.igated within the QCD s.m *** findings.reveal that molecular s.ates.containing charm quarks.do not form bound s.ates.whereas.s.ates.with b-quarks.can form exotic molecular *** obs.rvation has.s.gnificant implications.for unders.anding the s.ructure of thes. exotic s.ates.

关键词： QCD s.m rules exotic mes.ns molecular s.ates

Analys.s.of s.rong decays.of s.(3)partners.ofΩ(2012)baryon

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Chines. Phys.cs.C 2024年第8期48卷 34-41页

作者： T.m.Aliev s.Bilmis.m.s.vci Department of Phys.cs Middle East Technical UniversityAnkara 06800Turkey TUBITAK ULAKBIm Ankara 06510Turkey

We es.imate the coupling cons.ants.and decay widths.of the s.(3)partners.of theΩ(2012)hyperon,as.dis.overed by the BELLE Collaboration,us.ng the dis.ribution amplitudes.of the octet baryons.within the light cone s.m rules.*** s.udy includes.a comparis.n of the obtained res.lts.for the relevant decay widths.with thos. derived within the framework of the flavor s.(3)*** obs.rve a good agreement between the predictions.of both ***,our res.lt on the decay width ofΩ→ΞK is.compatible with the exis.ing experimental res.lt within the uncertainties.of the model *** res.lts.can provide helpful ins.ghts.for determining the nature of the s.(3)partners.of theΩ(2012)baryon.

关键词： coupling cons.ants light cone s.m rule hyperon

Leveraging Us.r-Generated Comments.and Fus.d BiLs.m models.to Detect and Predict Is.ues.with mobile Apps

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Computers. materials.& Continua 2024年第4期79卷 735-759页

作者： Wael m.s.Yafooz Abdullah Als.eedi Department of Computer s.ience College of Computer Science and EngineeringTaibah UniversityMedina42353Saudi Arabia

In the las. decade, technical advancements.and fas.er Internet s.eeds.have als. led to an increas.ng number ofmobile devices.and us.rs. Thus. all contributors.to s.ciety, whether young or old members. can us. thes. mobileapps. The us. of thes. apps.eas.s.our daily lives. and all cus.omers.who need any type of s.rvice can acces.it eas.ly, comfortably, and efficiently through mobile apps. Particularly, s.udi Arabia greatly depends.on digitals.rvices.to as.is. people and vis.tors. s.ch mobile devices.are us.d in organizing daily work s.hedules.and s.rvices.particularly during two large occas.ons. Umrah and Hajj. However, pilgrims.encounter mobile app is.ues.s.ch as.lownes., conflict, unreliability, or us.r-unfriendlines.. Pilgrims.comment on thes. is.ues.on mobile app platforms.hrough reviews.of their experiences.with thes. digital s.rvices. s.holars.have made s.veral attempts.to s.lve s.chmobile is.ues.by reporting bugs.or non-functional requirements.by utilizing us.r ***, s.lving s.chis.ues.is.a great challenge, and the is.ues.s.ill exis.. Therefore, this.s.udy aims.to propos. a hybrid deep learningmodel to clas.ify and predict mobile app s.ftware is.ues.encountered by millions.of pilgrims.during the Hajj andUmrah periods.from the us.r pers.ective. Firs.ly, a datas.t was.cons.ructed us.ng us.r-generated comments.fromrelevant mobile apps.us.ng natural language proces.ing methods. including information extraction, the annotationproces., and pre-proces.ing s.eps. cons.dering a multi-clas. clas.ification problem. Then, s.veral experiments.ere conducted us.ng common machine learning clas.ifiers. Artificial Neural Networks.(ANN), Long s.ort-Termmemory (Ls.m), and Convolutional Neural Network Long s.ort-Term memory (CNN-Ls.m) architectures. toexamine the performance of the propos.d model. Res.lts.s.ow 96% in F1-s.ore and accuracy, and the propos.dmodel outperformed the mentioned models.

关键词： mobile apps.is.ues play s.ore us.r comments deep learning Ls.m bidirectional Ls.m