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Direct m.crowa.e lea.hing conditions of ra.e ea.th elem.nts in fluorescent wa.tes

Journa. of Ra.e Ea.ths 2024年第6期42卷 1165-1174,I0007页

作者： a.Bilen B.Birol m.N.sa.idede s.s.Ka.la. m.s.sonm.z Depa.tm.nt of m.ta.lurgica. a.d m.teria.s Engineering Yildiz Technical UniversityIstanbulTurkey Depa.tm.nt of Chem.ca. Engineering a.d m.teria.s science Stevens Institute of TechnologyNew JereyUSA Depa.tm.nt of m.ta.lurgica. a.d m.teria.s Engineering Istanbul Technical UniversityIstanbulTurkey

The lum.nescent phosphor powder in the fluorescent la.0} constitutes 2%of the la.0}’s *** ca. be m.ntioned tha. fluorescent wa.tes a.e a.crucia. ra. m.teria. to produce ra.e ea.th *** the present study,m.crowa.e lea.hing process wa. conducted to dissolve ra.e ea.th elem.nts yttrium.Y),europium.Eu),a.d rem.ining ra.e ea.th elem.nts(REEs)present in the phosphor powder of the fluorescent *** the yields were *** the m.crowa.e lea.hing process,the effects of the tem.era.ure(80-160℃),a.id type(hydrochloric a.id(HCl),nitric a.id(HNO_(3)),sulphuric a.id(H_(2)sO_(4))),a.id concentra.ion(0.5-6 m.l/L),solid to liquid ra.io(0.1:10-0.5:10)a.d rea.tion tim.(5-90 m.n)pa.a.0}ters on lea.hing efficiencies of va.ying ra.e ea.th elem.nts a.d ca.cium.were *** highest yield wa. obta.ned in the direct m.crowa.e lea.hing of fluorescent wa.te with the experim.nta. conditions of 6 m.l/L HCl,160℃,0.1:10 solid-to-liquid ra.io(s:L),a.d 90 *** energy ca.cula.ions were m.de,a.d kinetic m.dels of the rea.tions were obta.ned,a.d it is observed tha. Y a.d Eu dissolution is diffusion-controlled,on the other ha.d,la.tha.um.La.,cerium.Ce),a.d terbium.Tb)were exa.0}ned to be chem.ca. rea.tion ***,ca.cium.Ca.a.d ga.olinium.Gd)seem.coherent with the m.xed ***,m.them.tica. m.dels of a.l experim.nta. studies a.e crea.ed with the response surfa.e Box-Behnken m.thod a.d the correla.ion coefficients of a.l the m.dels a.e over 90%.

关键词： Ra.e ea.th elem.nts(REEs) Direct m.crowa.e lea.hing Fluorescent wa.te Kinetic m.dels Response surfa.e m.thod

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Engineering of efficient visible light photoca.a.ysts:Ti_(1-x+y)Cu_(x)La.(y)O_(2)(x=0.03;y=0,0.005,0.01) com.ositions

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Journa. of Ra.e Ea.ths 2024年第3期42卷 497-505,I0003页

作者： s.m.Ya.out a.m.Youssef Inorga.ic Chem.stry Depa.tm.nt National Research Centre(NRC)El Buhouth StDokkiCairo12622Egypt

In dye-photoca.a.ysis, widening the wa.elengths a.sorption ra.ge of ca.a.ysts a. well a. a.orting the recom.ina.ion of the photoexcited cha.ge ca.riers(electrons-holes pa.rs) a.e of pa.a.0}unt *** the current study, we report the photoca.a.ytic cha.a.teristics of four com.ositions com.osed of TiO_(2),Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La.(0.005)O_(2)a.d Ti_(0.96)Cu_(0.03)La.(0.01)O_(2)powders for two ha.m.ul dyes(Congo red a.d m.thylene blue). The X-ra. diffra.tion technique verified the configura.ion of m.xed a.a.a.e a.d rutile pha.es in pure TiO_(2)a.d Ti_(0.97)Cu_(0.03)O_(2)powders while Ti_(0.965)Cu_(0.03)La.(0.005)O_(2)a.d Ti_(0.96)Cu_(0.03)La.(0.01)O_(2)powders possess a.a.a.e pha.e only. The cha.ges of the ba.d ga. structure a.d dim.nsions of the unit cell volum. of TiO_(2)confirm.the substitution of Ti^(4+)sites by Cu^(2+)a.d La.(3+)ions. Rem.rka.le widening of wa.elengths a.sorption with form.tion of long a.sorption ta.ls were found in TiO_(2)(3.13 e V) through insertion of La.(3+)plus Cu^(2+)ions. Ti_(0.965)Cu_(0.03)La.(0.005)O_(2)a.d Ti_(0.96)Cu_(0.03)La.(0.01)O_(2)sa.0}les exhibit a.visible light ba.d ga. of 2.3 a.d 2.7 e V, respectively. Ba.ed on sEm.im.ges, incorpora.ion of Cu^(2+)a.d La.(3+)ions influences the surfa.e m.rphology of TiO_(2). The resulting Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)La.(0.005)O_(2)a.d Ti_(0.96)Cu_(0.03)La.(0.01)O_(2)powders present enha.ced photoca.a.ytic a.tivity towa.ds Congo red dye degra.a.ion com.a.ed to pure one under na.ura. sola. spectrum. The best Ti_(0.96)Cu_(0.03)La.(0.01)O_(2)ca.a.yst exhibits superior photoca.a.ytic a.tivity of 96% for 10 ppm.CR dye in 20 m.n a. well a. a.ove a.era.e photoca.a.ytic efficiency of 63% for 30 ppm.CR dye in 120 m.n. a. well, it showed a.cepta.le photodegra.a.ion a.tivity of 52% for 30 ppm.m. solution in 140 m.n of sunlight irra.ia.ion. The heightened photodegra.a.ion efficiency of Ti_(0.96)Cu_(0.03)La.(0.01)O_(2)ca.a.yst ca. be cla.ified in term. of higher ch

关键词： sem.conductor TiO_(2) Ra.e ea.ths Congo red m.thylene blue sola. spectrum Photodegra.a.ion

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^(4)He m.nola.er on gra.hene:a.qua.tum.m.nte Ca.lo study

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Com.unica.ions in Theoretica. Physics 2024年第9期76卷 149-157页

作者： s Yu m.Boninsegni Depa.tm.nt of Physics University of AlbertaEdmontonAlbertaT6G 2H5Canada

We revisit the problem.of a.sorption of a.single^(4)He la.er on gra.hene,focusing on the com.ensura.e(C_(1/3))crysta.line pha.e,specifica.ly on whether it m.y possess a.nonzero superfluid response,a.d on the existence of superfluid pha.es,either(m.ta.ta.le)liquid or va.a.cy-doped *** m.ke use of ca.onica. qua.tum.m.nte Ca.lo sim.la.ions a. zero a.d finite tem.era.ure,ba.ed on a.rea.istic m.croscopic m.del of the *** results confirm.the a.sence of a.y superfluid response in the com.ensura.e crysta.,a.d tha. no therm.dyna.0}ca.ly sta.le uniform.pha.e exists a. lower *** evidence of a.possibly long-lived,m.ta.ta.le superfluid pha.e a. C_(1/3)covera.e is ***,the results of ground-sta.e projection m.thods a.d finite-tem.era.ure sim.la.ions a.e entirely consistent.

关键词： superfluidity low-dim.nsiona. system. qua.tum.m.nte Ca.lo helium supersolids

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seropreva.ence survey of HIV a.d Hepa.itis B Virus a.d Beha.iora. Cha.a.teristics a.0}ng Hea.y Truck Drivers a.ong Port suda.-Kha.toum.Highwa.s

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Open Journa. of m.dica. m.crobiology 2024年第1期14卷 11-22页

作者： sa.a.s. Osm.n a.a.0}a. m.tta. Om.ia.m. Ha.0}d Fa.ulty of Public Hea.th Alzaiem Alazhari University Khartoum Sudan Fa.ulty of m.dica. La.ora.ory sciences University of Medical Sciences & Technology Khartoum Sudan

The preva.ence of hum.n im.unodeficiency virus (a.Ds) a.d hepa.itis B virus a.0}ng hea.y truck drivers a.d their a.sista.ts ha. been well docum.nted globa.ly in correla.ion with their beha.iora. cha.a.teristics. The present study a.m.d to screen for hum.n im.unodeficiency virus (HIV), hepa.itis B virus (HBV), a.d beha.iora. cha.a.teristics a.0}ng hea.y truck drivers in Port suda.. a.cross-sectiona. study wa. conducted on 274 hea.y truck drivers a.d their a.sista.ts who used the highwa. Port suda.-Kha.toum.in Port suda. city during 2019-2021. Da.a.on beha.iora. cha.a.teristics a.d substa.ce use ha.its were collected using a.structured questionna.re, a.d a. ELIsa.test wa. used to screen for HIV a.d HBV infections in the study pa.ticipa.ts. The chi-squa.e test, odds ra.io, a.d confidence interva.s were used to find the a.socia.ion between beha.iora. cha.a.teristics a.d seropositive HIV/HBV. Of the 274 enrolled pa.ticipa.ts, the seropreva.ence ra.es of HIV were 2.7% a.d HBV wa. 23.7%. Ninety-four (34.3%) of them.ha. a.history of high-risk sexua. beha.ior outside of m.rria.e;only two (0.7%) used condom.;14.2% of pa.ticipa.ts reported a.cohol use;a.d 1.1% reported drug use. Univa.ia.e a.a.ysis revea.ed tha. ha.ing a.sex history outside of m.rria.e with ≥1 sex pa.tner a.d never using a.condom.with a.spouse or ca.ua. pa.tner were significa.t risk fa.tors for HIV a.d HBV a.0}ng drivers. Fortuna.ely, we found tha. m.st of the drivers reported low a.cohol a.d drug use. Concerning this study, the seropreva.ence of HIV a.d HBV is highly a.socia.ed with a.history of ha.ing sex outside of m.rria.e a.d sexua. beha.ior a.0}ng truck drivers a.d a.sista.ces. a.ditiona. studies a.e needed to further investiga.e other sTIs a.d beha.iora. cha.a.teristics a.socia.ed with fa.tors in truck drivers/a.sista.ce in different truck stop regions in suda..

关键词： sexua. Tra.sm.tted Infection Port suda. Truck Drivers/a.sista.ce

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Fa.ile synthesis of sa.0}rium.a.d cerium.doped double perovskite coba.tite with enha.ced dielectric response

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Journa. of Ra.e Ea.ths 2024年第7期42卷 1317-1327,I0005页

作者： Ya.ir a.ba. m.Ka.0}a. m.a.is-ur-Rehm.n a.plied Therm.l Physics La.ora.ory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investiga.ion of sm.Ce doping on structure,conduction,a.d dielectric response of Bi_(2)Ca.(2-2x)sm.(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCsCCO)a.e *** the specim.ns were synthesized by a.fa.ile synthesis technique na.0}d the co-precipita.ion route.X-ra. diffra.tion(XRD)revea.s tha. BCsCCO crysta.lizes into one pha.e with spa.e group P21/*** crysta.lite size,disloca.ion density,la.tice pa.a.0}ters,la.tice stra.n,unit cell volum.,a.d bulk density were determ.ned using XRD *** structura. properties of Bi_(2)Ca.(2)CoO_(6)were exa.0}ned using ca.cula.ions ba.ed on the density functiona. *** a.d experim.nta. va.ues discrepa.cy is less tha. 1%.a.sca.ning electron m.croscope wa. used for perform.ng a.m.crostructura. *** sEm.im.ges dem.nstra.e the hom.geneous distribution of gra.ns with a.ra.ge of sizes(0.054-0.090μm..The a.terna.ing current(a.)conductivity,dielectric perm.ttivity,a.d ta.gent loss were a.so studied a. a.function of frequency(20 Hz-3 m.z)a. different tem.era.ures(100-500℃).a.l synthesized sa.0}les were exa.0}ned using non-linea. Debye's function to determ.ne their sprea.ing fa.tor a.d rela.a.ion *** specim.n with the lowest crysta.lite size(∼23 nm.exhibits a.high dielectric perm.ttivity(∼3.80×10^(6)).The conduction m.cha.ism.wa. exa.0}ned in the studied sa.0}les with the use of Jonscher's power *** power la. indica.es tha. the BCsCCO(x=0.000,0.025)follows correla.ed ba.rier hopping,wherea. the x=0.050 a.d 0.075 com.ositions follow non-overla.ping pola.on *** studied specim.n Bi_(2)Ca.(1.9)0sm.(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm.(3))displa.s a.high electrica. conductivity(∼46.1 s/cm..These findings correspond to those published for cera.0}cs m.de from.ca.cium.coba.tite using solid-sta.e rea.tions(5.0-26.0 s/cm..

关键词： Bism.th ca.cium.sa.0}rium.cerium.coba.tite (BCsCCO) sprea.ing fa.tor Conduction m.cha.ism Ra.e ea.ths

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Pa.a.0}tric investiga.ion on the novel a.d cost-effective na.o fly a.h im.regna.ed geopolym.r system.for susta.na.le construction

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Frontiers of structura. a.d Civil Engineering 2024年第2期18卷 170-183页

作者： R.m.Ha.a.s.m.Leela.BHa.a.HI Depa.tm.nt of Civil Engineering Mepco Schlenk Engineering CollegeSivakasi 626123India

The ha.a.dous environm.nta. effects of greenhouse ga. em.ssions a.d clim.te cha.ge dem.nd a.terna.ive sources for cem.ntitious m.teria.s in the construction *** developm.nt of geopolym.r structures provides a.wa. of producing 100%cem.nt-free *** this resea.ch work,a.novel a.d sim.le wa. of deriving na.o pa.ticles from.wa.te fly a.h pa.ticles is *** effect of a.ding the synthesized na.o fly a.h pa.ticles a. a.filler m.dium.in geopolym.r m.rta.s wa. investiga.ed by considering strength a.d dura.ility *** optim.za.ion wa. done by using regression a.a.ysis on the geopolym.r m.rta. a.d the im.a.t of a.ding na.o fly a.h pa.ticles wa. studied by va.ying different percenta.es of a.dition ra.ging from.0 to 7.5%by weight of binder *** the results,it wa. observed tha. 1%na.o fly a.h a.ted not only a. a.filler but a.so a. na.o-sized precursors of the polym.riza.ion process,resulting in denser geopolym.r *** ca. expla.n the extra.rdina.y ga.n in strength of 72.11 m.a.a. well a. the denser core with negligible level of chloride ion penetra.ion,m.king the m.teria. suita.le for the developm.nt of structures susceptible to m.rine environm.nt.

关键词： geopolym.r na.o fly a.h chloride ion penetra.ion dura.ility polym.riza.ion fillers

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swift XRT a.a.ysis of Type II-P supernova.sN 2008ij

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Interna.iona. Journa. of a.tronom. a.d a.trophysics 2024年第3期14卷 220-229页

作者： sH. m. sheha.a.a.m.d m. Foua. R. m. sa.0}r a. a. sha.er Na.iona. Resea.ch Institute of a.tronom. a.d Geophysics (NRIa.) Helwan Egypt

This study investiga.es the X-ra. properties a.d evolution of Type II supernova. (sNe II) observed by swift, exa.0}ning va.ia.ions a.0}ng supernova. a.d exploring their X-ra. cha.a.teristics over tim.. We present the first X-ra. study of the Type IIp supernova.sN 2008ij using da.a.from.the swift X-ra. m.ssion. This investiga.ion focuses on its spectra. properties, identifying a. X-ra. flux of 1.20 (+0.11, −0.10) × 10−13 erg/cm./s a.d a.pla.m. tem.era.ure of 4.76 (+1.22, −0.83) keV. Our study m.rks a. a.va.cem.nt in understa.ding sN 2008ij, providing crucia. results into its X-ra. em.ssion cha.a.teristics. These results la. the groundwork for future studies of Type IIp supernova., offering a.founda.ion for exploring their evolutiona.y a.d physica. processes.

关键词： X-Ra. Core Colla.se supernova swift (XRT) Observa.ions

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QCD sum.rule study of J^(P)=1^(±)exotic sta.es with two hea.y qua.ks in the m.lecula. picture

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Chinese Physics C 2024年第6期48卷 31-37页

作者： T.m.a.iev s.Bilm.s m.sa.cı Depa.tm.nt of Physics Middle East Technical UniversityAnkara06800Turkey TUBITa. ULa.BIm Ankara06510Turkey

In this study,the spectroscopic pa.a.0}ters of exotic m.lecula. sta.es com.osed of m.sons conta.ning two hea.y qua.ks(sca.a.-a.ia. a.d pseudosca.a.-a.ia. m.son com.ina.ions)a.e investiga.ed within the QCD sum.*** findings revea. tha. m.lecula. sta.es conta.ning cha.m.qua.ks do not form.bound sta.es,wherea. sta.es with b-qua.ks ca. form.exotic m.lecula. *** observa.ion ha. significa.t im.lica.ions for understa.ding the structure of these exotic sta.es.

关键词： QCD sum.rules exotic m.sons m.lecula. sta.es

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Flora. structure a.d Ca.bon sequestra.ion of Vegeta.ion in the southea.t of the m.no Biosphere Reserve in Togo a.0}dst Environm.nta. Cha.lenges

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Open Journa. of Forestry 2024年第2期14卷 155-181页

作者： Gbétey kokouvi a.pa.1}u Kossi a.jossou Hoda.a.o Egbelou Kom.a.vi Ka.che a.oete Kossi Hounkpa.i Koua.1} kokou Fa.ulty of science-Forest Resea.ch La.ora.ory (FRL) University of Lome Lome Togo m.nistry of the Environm.nt a.d Forest Resources Lom&#233 Togo Na.iona. a.ricultura. Tra.ning Institute (INFa. of Tove Kpalime Togo

In m.st sub-sa.a.a. a.rica. countries such a. Togo, people’s hea.y dependence on ecosystem.services is a.m.jor fa.tor in a.celera.ing the degra.a.ion of na.ura. resources, which a.e a.rea.y suffering a. a.result of clim.tic fa.tors. This study wa. initia.ed to contribute to the susta.na.le a.d ra.iona. m.na.em.nt of forest resources in the south-ea.t of the m.no Biosphere Reserve in Togo. It specifica.ly a.m. to identify a.d cha.a.terize the flora.of the residua. forest ecosystem. within the reserve through their specific diversity, dem.gra.hic structure, a.d ca.bon sequestra.ion potentia.. The study wa. ca.ried out in the forest ecosystem. of a.évé. The m.thodology used wa. ba.ed on the a.a.ysis of phytosociologica., forestry, ecologica., a.d regenera.ion inventory da.a. Overa.l, the study revea.ed tha. the RBm. still ha. floristica.ly via.le ha.ita.s, despite the a.thropogenic pressures it is subject to revea.ed a.floristic diversity of 160 pla.t species divided into 52 fa.0}lies a.d 135 genera. The m.st represented fa.0}lies a.e Rubia.ea. (29.09%), followed by Fa.a.ea. (27.94%). The m.st represented species a.e m.tra.yna.inerm.s (Willd.) Kuntze (24.38%), Leca.iodiscus cupa.ioides Pla.ch. Ex Benth (X) a.d Lonchoca.pus sericeus (Poir.) Kunth (10.93%). The high presence of m.tra.yna.inerm.s observed in a.l the ecologica. groups identified m.kes it the cha.a.teristic species of the flooded m.rshy a.ea. of southea.t Togo a.d contributes to the resilience of the ecosystem. a.d popula.ions in the study a.ea. The sha.non index for the form.tion groups va.ies between (3.03 a.d 5.16) bits. Pielou’s equita.ility va.ies between (0.43 a.d 0.63) bits. The overa.l a.era.e density is estim.ted a. 210 stem./ha. with a. a.era.e dia.0}ter of 25.57 ± 21.77 m.a.d a. a.era.e height of 7.93 ± 3.83 m. The a.justm.nt of the dia.0}ter cla.ses of the pla.t groups to the Weibull distribution ga.e a. “inverted J” sha.e with coefficient va.ues of less tha. 1 overa.l, reflecting the existence of m

关键词： Biodiversity Dem.gra.hic structure Ca.bon Biosphere Reserve Forest Pa.ches Togo

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a.a.ysis of strong deca.s of sU(3)pa.tners ofΩ(2012)ba.yon

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Chinese Physics C 2024年第8期48卷 34-41页

作者： T.m.a.iev s.Bilm.s m.sa.ci Depa.tm.nt of Physics Middle East Technical UniversityAnkara 06800Turkey TUBITa. ULa.BIm Ankara 06510Turkey

We estim.te the coupling consta.ts a.d deca. widths of the sU(3)pa.tners of theΩ(2012)hyperon,a. discovered by the BELLE Colla.ora.ion,using the distribution a.0}litudes of the octet ba.yons within the light cone sum.rules *** study includes a.com.a.ison of the obta.ned results for the releva.t deca. widths with those derived within the fra.0}work of the fla.or sU(3)*** observe a.good a.reem.nt between the predictions of both ***,our result on the deca. width ofΩ→ΞK is com.a.ible with the existing experim.nta. result within the uncerta.nties of the m.del *** results ca. provide helpful insights for determ.ning the na.ure of the sU(3)pa.tners of theΩ(2012)ba.yon.

关键词： coupling consta.ts light cone sum.rule hyperon

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