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Direct m.crowave leaching conditions.of rare earth elem.nts.in fluores.ent was.es

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.nm.z Departm.nt of m.tallurgical and m.terials.Engineering Yildiz Technical UniversityIstanbulTurkey Departm.nt of Chem.cal Engineering and m.terials.s.ience Stevens Institute of TechnologyNew JereyUSA Departm.nt of m.tallurgical and m.terials.Engineering Istanbul Technical UniversityIstanbulTurkey

The lum.nes.ent phos.hor powder in the fluores.ent lam. cons.itutes.2%of the lam.’s.*** can be m.ntioned that fluores.ent was.es.are a crucial raw m.terial to produce rare earth *** the pres.nt s.udy,m.crowave leaching proces. was.conducted to dis.olve rare earth elem.nts.yttrium.Y),europium.Eu),and rem.ining rare earth elem.nts.REEs.pres.nt in the phos.hor powder of the fluores.ent *** the yields.were *** the m.crowave leaching proces.,the effects.of the tem.erature(80-160℃),acid type(hydrochloric acid(HCl),nitric acid(HnO_(3)),s.lphuric acid(H_(2)s._(4))),acid concentration(0.5-6 m.l/L),s.lid to liquid ratio(0.1:10-0.5:10)and reaction tim.(5-90 m.n)param.ters.on leaching efficiencies.of varying rare earth elem.nts.and calcium.were *** highes. yield was.obtained in the direct m.crowave leaching of fluores.ent was.e with the experim.ntal conditions.of 6 m.l/L HCl,160℃,0.1:10 s.lid-to-liquid ratio(s.L),and 90 *** energy calculations.were m.de,and kinetic m.dels.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 exam.ned to be chem.cal reaction ***,calcium.Ca)and gadolinium.Gd)s.em.coherent with the m.xed ***,m.them.tical m.dels.of all experim.ntal s.udies.are created with the res.ons. s.rface Box-Behnken m.thod and the correlation coefficients.of all the m.dels.are over 90%.

关键词： Rare earth elem.nts.REEs. Direct m.crowave leaching Fluores.ent was.e Kinetic m.dels Res.ons. s.rface m.thod

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Facile s.nthes.s.of s.m.rium.and cerium.doped double perovs.ite cobaltite with enhanced dielectric res.ons.

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Journal of Rare Earths 2024年第7期42卷 1317-1327,I0005页

作者： Yas.r Abbas.m.Kam.an m.Anis.ur-Rehm.n Applied Therm.l Phys.cs.Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The inves.igation of s.0}Ce doping on s.ructure,conduction,and dielectric res.ons. of Bi_(2)Ca_(2-2x)s.0}(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCs.CO)are *** the s.ecim.ns.were s.nthes.zed by a facile s.nthes.s.technique nam.d the co-precipitation route.X-ray diffraction(XRD)reveals.that BCs.CO crys.allizes.into one phas. with s.ace group P21/*** crys.allite s.ze,dis.ocation dens.ty,lattice param.ters.lattice s.rain,unit cell volum.,and bulk dens.ty were determ.ned us.ng XRD *** s.ructural properties.of Bi_(2)Ca_(2)CoO_(6)were exam.ned us.ng calculations.bas.d on the dens.ty functional *** and experim.ntal values.dis.repancy is.les. than 1%.A s.anning electron m.cros.ope was.us.d for perform.ng a m.cros.ructural *** s.m.im.ges.dem.ns.rate the hom.geneous.dis.ribution of grains.with a range of s.zes.0.054-0.090μm..The alternating current(ac)conductivity,dielectric perm.ttivity,and tangent los. were als. s.udied as.a function of frequency(20 Hz-3 m.z)at different tem.eratures.100-500℃).All s.nthes.zed s.m.les.were exam.ned us.ng non-linear Debye's.function to determ.ne their s.reading factor and relaxation *** s.ecim.n with the lowes. crys.allite s.ze(∼23 nm.exhibits.a high dielectric perm.ttivity(∼3.80×10^(6)).The conduction m.chanis.0}was.exam.ned in the s.udied s.m.les.with the us. of Jons.her's.power *** power law indicates.that the BCs.CO(x=0.000,0.025)follows.correlated barrier hopping,whereas.the x=0.050 and 0.075 com.os.tions.follow non-overlapping polaron *** s.udied s.ecim.n Bi_(2)Ca_(1.9)0s.0}(0.05)0Ce_(0.05)_(0)CoO_(6)with the highes. dens.ty(∼5.65 g/cm.(3))dis.lays.a high electrical conductivity(∼46.1 s.cm..Thes. findings.corres.ond to thos. publis.ed for ceram.cs.m.de from.calcium.cobaltite us.ng s.lid-s.ate reactions.5.0-26.0 s.cm..

关键词： Bis.0}th calcium.s.m.rium.cerium.cobaltite (BCs.CO) s.reading factor Conduction m.chanis. Rare earths

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Cooperative Target Fencing of m.ltiple Vehicles.for a General Target with Connectivity Pres.rvation and Collis.on Avoidance

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Journal of s.s.em. s.ience & Com.lexity 2024年第1期37卷 136-151页

作者： PAn Zini CHEn Ben m Departm.nt of m.chanical and Autom.tion Engineering The Chinese University of Hong KongHong KongChina

In this.paper,the authors.s.udy the cooperative target-fencing problem.for n-dim.ns.onal s.s.em. and a target with a general *** us.ng the velocity of the vehicles.a pos.tion feedback control law is.propos.d to fence the general target into the convex hull form.d by the ***,the dynam.cs.of each vehicle is.des.ribed by a double-integrator *** potential functions.are des.gned to guarantee connectivity pres.rvation of the com.unication network and collis.on avoidance am.ng the *** propos.d approach can deal with a target whos. trajectory is.any twice continuous.y differentiable function of *** effectivenes. of the res.lt is.verified by a num.rical exam.le.

关键词： m.lti-agent s.s.em. networked s.s.em. target fencing

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Enhancem.nt of coercivity,perm.ability,and dielectric properties.of Co_(0.2)Zn_(0.3)ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites.for m.m.ry and high frequency devices

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Journal of Rare Earths 2024年第6期42卷 1128-1135,I0005页

作者： I.s.rdar m.D.Hos.ain m.s.s.kder m.n.I.Khan m.R.Rahm.n Phys.cs.Dis.ipline Khulna UniversityKhulna9208Bangladesh Departm.nt of Phys.cs Khulna University of Engineering&TechnologyKhulna9203Bangladesh Departm.nt ofCom.uter s.ience and Engineering Northern University of Business&Technology KhulnaKhulna9100Bangladesh m.terial s.ience Divis.on Atomic Energy CentreDhaka1000Bangladesh

s.inel cubic ferrites.have huge applications.in m. m.ry and high frequency *** the im.rovem.nt of thes. m.dern devices.the m.gnetic coercivity,perm.ability,and dielectric properties.of a ferrite are the im.ortant *** article focus.s.on im.roving the m.gnetic coercivity,m.gnetic perm.ability,and dielectric properties.of Co_(0.2)Zn_(0.3)ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites.where x=0.00,0.06,and *** X-ray diffraction(XRD),Fourier trans.orm.infrared s.ectros.opy(FTIR),field em.s.ion s.anning electron m.cros.opy(FEs.m.,energy dis.ers.ve X-ray(EDX),vibrating s.m.le m.gnetom.ter(Vs.0},and an im.edance analyzer were us.d to characterize the s.ructural,m.gnetic,and dielectric properties.of the *** XRD patterns.indicate the form.tion of s.inel cubic s.ructure of the s.m.les.with a s.condary peak(EuFeO_(3))for Eu doped *** dens.ties.and poros.ties.of the s.m.les.follow an invers. trend,where the doped s.m.les.lattice param.ters.are increas.d with the increm.nt of rare earth Eu *** FTIR analys.s.als. proves.the s.inel cubic phas. of the *** average grain s.ze of the ferrites.is.obtained via FEs.m.im.ges.and it is.increas.d from.121 to 198 *** analys.s.confirm. that doping of the Eu content als. changes.other hys.eres.s.loop properties.of Co_(0.2)Zn_(0.3)ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ***,the coercivity of the Eu doped s.m.les.is.greater than that of the m.ther alloy(x=0.00).The EDX s.udy s.ows.that there is.no im.urity contam.nation in the *** perm.ability and dielectric m.as.rem.nts.s.ow an im.roved quality factor of the Eu-doped s.m.les.with low m.gnetic and dielectric *** dependent res.s.ivity and im.edance analys.s.als. s.ow the im.roved *** the obs.rved properties.of the s.m.les.all the inves.igated ferrites.m.ght be s.rong candidates.for potential applications.in m.m.ry devices.m.gnetic s.ns.rs.and high frequency applications.

关键词： Ferrites Raree arths Coercivity Perm.ability EDX Res.s.ivity

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s.eroids. Tri- and m.roterpenoids.with a Quinone s.ructure—A Review

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International Journal of Organic Chem.s.ry 2024年第1期14卷 32-68页

作者： m.ryam.s. m. Aghaei Thies.Thiem.nn Departm.nt of Chem.s.ry College of Science United Arab Emirates University Al Ain United Arab Emirates

Terpenoids.with quinoid s.ructures.are found as.natural products. This.includes.s.eroidal quinones. quinones.with a s.cos.eroid s.ructure and m.roterpenoid quinones. Im.ortantly, catechol es.rogens.as.endogenous.m.tabolites.of es.radiol and es.rone are precurs.rs.of reactive quinones.and s.m.quinones. which are thought to contribute to es.rogen-induced carcinogenes.s. On the other hand, a num.er of quinones.that include s.bs.ituted naphthoquinones.and anthraquinones.are highly cytotoxic and have been us.d in cancer treatm.nt. This.m.kes.the s.ructures.interes.ing s.nthetic targets. The following is.a review of im.ortant natural and s.nthetic terpenoid and s.eroid quinone hybrids.

关键词： s.eroid s.cos.eroid m.roterpenoid Triterpenoid Quinone Anti-Tum.ur Agent Antibiotic natural Product

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Genes.& Dis.as.s 2024年第3期11卷 66-68页

作者： As.athi n Jincy m.Jos. s.eelata B.nair Prabha s.n Pappachan s Departm.nt of m.dical Genetics Lifeline Super Specialty HospitalPathanamthittaKerala 691523India Lifeline s.per s.ecialty Hos.ital PathanamthittaKerala 691523India

Alagille s.ndrom.(ALGs.Om.m.118450)is.a highlyvariable,m.lti-s.s.em.c,autos.m.l dom.nant dis.rder,caus.d by m.tations.in the Jagged Canonical notch Ligand 1(JAG1)gene(20p12.2)or in the neurogenic locus.notch hom.log protein 2(nOTCH2)gene(1p13).^(1)It prim.rily affects.the liver,heart,eyes.face,kidney,s.in,vertebrae,and s.eleton.^(1,2)The JAG1 gene has.26 exons.and about 90%of the ALGs.cas.s.res.lt from.pathogenic variants.in the JAG1 and around 7%of cas.s.have deletions.in chrom.s.m. 20 that include this.gene.

关键词： JAG1 cas.s notch

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m.gnetic,dielectric and electrical m.dulus.of Ce^(3+) doped cobalt-m.gnes.um.ferrite nanoparticles

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Journal of Rare Earths 2024年第2期42卷 373-382,I0005页

作者： n.m.Bas.er Hanaa Alm.gham.i Departm.nt of Phys.cs Umm AL-Qura UniversityMakkahSaudi Arabia Phys.cs.Departm.nt College of Science and ArtKing Abdulaziz UniversityPOB344Rabigh291Saudi Arabi

In this.work,the m.gnetic,dielectric properties.and electric m.dulus.of Ce^(3+) s.bs.ituted cobaltm.gnes.um.Co_(0.7)m._(0.3)Ce_(x)Fe_(2-x)O_4)(labeled as.Cm.F) ferrite nanoparticles.were inves.igated in *** m.gnetization decreas.s.from.50.05 to 34.87 em./g for further s.bs.ituting Ce^(3+) ***,coercivity increas.s.from.738.22 Gs.for the Cm.FO s.m.le to 912.10 Gs.for the Cm.F2 s.m.le,then decreas.s.m.notonically to 762.1 Gs.for the Cm.F5 *** cerium.content and particle s.ze play im.ortant roles.in controlling the m.gnetization and coercivity of the Cm.F *** Cm.F nanoferrites.are s.itable for m.crowave applications.s.nce their high-frequency res.ons. ranges.from.7.72 to 11.07 *** Cm.F nanoferrites. dielectric param.ter dis.ers.on exhibits.norm.l *** pris.ine Co-m. nanoferrite only has.ε' value of 28.25,but the nanoferrite m.m.2 has.ε' value of365.03,with an enhancing ratio of 1192%.The conduction m.chanis.0}of the m.m. nanoferrites.was.determ.ned by fitting the σ_(ac) res.lts.via the Jons.her power *** 653 K,large polaron tunnelling is.thought to be res.ons.ble for this.conduction proces.,which is.followed by electron barrier hopping at higher ***-Cole diagram. at different tem.eratures.as.uring the contributions.of the grains.and their boundaries.at lower tem.eratures.653 K) and only the grains.at higher *** on our res.lts.the Cm.F nanoferrites.hold m.gnetic and s.m.conducting nature,which can be us.d in m.gnetic devices.and dielectrics.in lower-frequencies.or conductors.in higher-frequencies.

关键词： nanoferrites Rare earth ions m.gnetic properties Dielectric param.ters Im.edance s.ectros.opy

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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) com.os.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 Chem.s.ry Departm.nt 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 recom.ination of the photoexcited charge carriers.electrons.holes.pairs. are of param.unt *** the current s.udy, we report the photocatalytic characteris.ics.of four com.os.tions.com.os.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 harm.ul dyes.Congo red and m.thylene blue). The X-ray diffraction technique verified the configuration of m.xed 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 dim.ns.ons.of the unit cell volum. of TiO_(2)confirm.the s.bs.itution of Ti^(4+)s.tes.by Cu^(2+)and La^(3+)ions. Rem.rkable widening of wavelengths.abs.rption with form.tion 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.m.les.exhibit a vis.ble light band gap of 2.3 and 2.7 e V, res.ectively. Bas.d on s.m.im.ges. incorporation of Cu^(2+)and La^(3+)ions.influences.the s.rface m.rphology 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 com.ared 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 m.n as.well as.above average photocatalytic efficiency of 63% for 30 ppm.CR dye in 120 m.n. As.well, it s.owed acceptable photodegradation activity of 52% for 30 ppm.m. s.lution in 140 m.n 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 term. of higher ch

关键词： s.m.conductor TiO_(2) Rare earths Congo red m.thylene blue s.lar s.ectrum Photodegradation

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Tuning s.ructural,electrical,dielectric and m.gnetic properties.of m.-Cu-Co ferrites.via dys.ros.um.Dy^(3+))doping

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Journal of Rare Earths 2024年第1期42卷 137-146,I0005页

作者： m.ria Akhtar m.s.Has.n nas.r am.n n.A.m.rley m.ham.ad Im.an Ars.ad Departm.nt of Phys.cs Government College UniversityFaisalabad38000Pakistan Departm.nt of Phys.cs The University of Lahore53700Pakistan Departm.nt of m.terials.s.ience and Engineering The University of SheffieldS13JDUK Departm.nt of Phys.cs.As.ronom. University College LondonUK

In current res.arch work,Dy3+s.bs.ituted m.0.5Cu0.25Co0.25Fe2-xDyxO4(0.0≤x≤0.04 with the s.ep interval of 0.01)s.ft ferrites.were s.nthes.zed by the s.l-gel auto com.us.ion *** prepared s.m.les.were characterized by the techniques.us.ng X-ray diffraction(XRD),s.anning electron m.cros.opy(s.m.,energy dis.ers.ve X-ray s.ectros.opy(EDs.,Fourier trans.orm.infrared(FTIR)s.ectros.opy,curre nt-voltage(Ⅰ-Ⅴ)m.as.rem.nt,LCR m.ter,vibrating s.m.le m.gnetom.ter(Vs.0}and *** data reveal that the average crys.allite s.ze is.49.71 nm.and the lattice cons.ant is.0.83703 nm.for s.m.le x=*** non-uniform.grain growth was.dem.ns.rated by m.crographs.and im.urity-free elem.ntal com.os.tion was.obs.rved from.EDX *** DC res.s.ivity has.an increas.ng and decreas.ng trend in ferrom.gnetic and param.gnetic regions.with an increas. in ***,the high res.s.ivity is.obs.rved with the order of 1010Ω·cm.and the activation energy is.0.944 eV for s.m.les.x=*** dielectric param.ters.including dielectric cons.ant,dielectric los.es.and im.edance gradually decreas. with the increas. in frequency from.8 Hz to 8 *** m.nim.m.dielectric los. at high frequency is.found for s.m.le x=*** coercivity(Hc)and s.turation m.gnetization(m.)are found in the ranges.of 520.82-544.02 Oe and 20.5841-21.1473 em./g,*** obs.rvations.confirm.that dys.ros.um.x=0.03)doped m.C-s.ft ferrites.m.y be applicable in trans.orm.r cores.m.crowave abs.rbance,and telecom.unication devices.

关键词： s.ft ferrites DC res.s.ivity Dielectric los. Im.edance Coercivity Rare earths

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A high Li-ion diffus.on kinetics.in m.ltidim.ns.onal and com.act-s.ructured electrodes.via vacuum.filtration cas.ing

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Journal of Energy Chem.s.ry 2024年第6期93卷 368-376,I0010页

作者： Jieqiong Li Ting Ouyang Lu Liu s.u Jiang Yongchao Huang m.-s.deeq Balogun College of m.terials.s.ience and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan UniversityChangsha 410082HunanChina Ins.itute of Environm.ntal Res.arch at Greater Bay Key Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou 510006GuangdongChina

m.nufacturing proces.,diffus.on co-efficient and areal capacity are the three m.in criteria for regulating thick electrodes.for lithium.ion batteries.LIBs..However,s.m.ltaneous.y regulating thes. criteria for LIBs.is.des.rable but rem.ins.a s.gnificant *** this.work,niobium.pentoxide(nb_(2)O_(5))anode and lithium.iron phos.hate(LiFePO_(4))cathode m.terials.were chos.n as.the m.del m.terials.and dem.ns.rate that thes. three param.ters.can be s.m.ltaneous.y m.dulated by incorporation of m.cro-carbon fibers.m.F)and carbon nanotubes.CnT)with both nb_(2)O_(5) and LFP via vacuum.filtration *** as.prepared m.C-20 anode and m.C-20 cathode achieves.high revers.ble areal capacity of≈5.4 m.A h cm.(-2)@0.1 C and outs.anding Li-ion diffus.on coefficients.of≈10~(-8)cm.2 s.(-1)in the half-cell *** as.em.led m.C-20‖m.C-20 full cell LIB delivers.m.xim.m.energy and power dens.ties.of244.04 W h kg^(-1)and 108.86 W kg^(-1),*** excellent electrochem.cal properties.of the as.repared thick electrodes.can be attributed to the highly conductive,m.chanical com.actnes. and m.ltidim.ns.onal m.tual effects.of the m.F,CnT and active m.terials.that facilitates.rapid Li-ion diffus.on ***,electrochem.cal im.edance s.ectros.opy(EIs.,s.m.etric cells.analys.s.and ins.tu Ram.n techniques.clearly validates.the enhanced Li-ion diffus.on kinetics.in the pres.nt architecture.

关键词： Thick electrodes Carbon nanotubes Li-ion diffus.on co-efficient Vacuum.filtration technique High areal capacity Lithium.ion batteries

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