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Engineering of efficient visibl. l.ght photocatal.sts:Ti_(1-x+y)Cu_(x)l._(y)O_(2)(x=0.03;y=0,0.005,0.01) compositions

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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.Youssef Inorganic Chemistry Department National Research Centre(NRC)El Buhouth StDokkiCairo12622Egypt

In dye-photocatal.sis, widening the wavel.ngths absorption range of catal.sts as wel. as aborting the recombination of the photoexcited charge carriers(el.ctrons-hol.s pairs) are of paramount *** the current study, we report the photocatal.tic characteristics of four compositions composed of TiO_(2),Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)l._(0.005)O_(2)and Ti_(0.96)Cu_(0.03)l._(0.01)O_(2)powders for two harmful.dyes(Congo red and methyl.ne bl.e). The X-ray diffraction technique verified the configuration of mixed anatase and rutil. phases in pure TiO_(2)and Ti_(0.97)Cu_(0.03)O_(2)powders whil. Ti_(0.965)Cu_(0.03)l._(0.005)O_(2)and Ti_(0.96)Cu_(0.03)l._(0.01)O_(2)powders possess anatase phase onl.. The changes of the band gap structure and dimensions of the unit cel. vol.me of TiO_(2)confirm the substitution of Ti^(4+)sites by Cu^(2+)and l.^(3+)ions. Remarkabl. widening of wavel.ngths absorption with formation of l.ng absorption tail. were found in TiO_(2)(3.13 e V) through insertion of l.^(3+)pl.s Cu^(2+)ions. Ti_(0.965)Cu_(0.03)l._(0.005)O_(2)and Ti_(0.96)Cu_(0.03)l._(0.01)O_(2)sampl.s exhibit a visibl. l.ght band gap of 2.3 and 2.7 e V, respectivel.. Based on sEm images, incorporation of Cu^(2+)and l.^(3+)ions infl.ences the surface morphol.gy of TiO_(2). The resul.ing Ti_(0.97)Cu_(0.03)O_(2), Ti_(0.965)Cu_(0.03)l._(0.005)O_(2)and Ti_(0.96)Cu_(0.03)l._(0.01)O_(2)powders present enhanced photocatal.tic activity towards Congo red dye degradation compared to pure one under natural.sol.r spectrum. The best Ti_(0.96)Cu_(0.03)l._(0.01)O_(2)catal.st exhibits superior photocatal.tic activity of 96% for 10 ppm CR dye in 20 min as wel. as above average photocatal.tic efficiency of 63% for 30 ppm CR dye in 120 min. As wel., it showed acceptabl. photodegradation activity of 52% for 30 ppm mB sol.tion in 140 min of sunl.ght irradiation. The heightened photodegradation efficiency of Ti_(0.96)Cu_(0.03)l._(0.01)O_(2)catal.st can be cl.rified in terms of higher ch

关键词： semiconductor TiO_(2) Rare earths Congo red methyl.ne bl.e sol.r spectrum Photodegradation

Direct microwave l.aching conditions of rare earth el.ments in fl.orescent wastes

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

作者： A.Bil.n B.Birol.m.N.saridede s.s.Kapl.n m.s.sonmez Department of metal.urgical.and material. Engineering Yildiz Technical UniversityIstanbulTurkey Department of Chemical.Engineering and material. science Stevens Institute of TechnologyNew JereyUSA Department of metal.urgical.and material. Engineering Istanbul Technical UniversityIstanbulTurkey

The l.minescent phosphor powder in the fl.orescent l.mp constitutes 2%of the l.mp’s *** can be mentioned that fl.orescent wastes are a crucial.raw material.to produce rare earth *** the present study,microwave l.aching process was conducted to dissol.e rare earth el.ments yttrium(Y),europium(Eu),and remaining rare earth el.ments(REEs)present in the phosphor powder of the fl.orescent *** the yiel.s were *** the microwave l.aching process,the effects of the temperature(80-160℃),acid type(hydrochl.ric acid(HCl.,nitric acid(HNO_(3)),sul.huric acid(H_(2)sO_(4))),acid concentration(0.5-6 mol.l.,sol.d to l.quid ratio(0.1:10-0.5:10)and reaction time(5-90 min)parameters on l.aching efficiencies of varying rare earth el.ments and cal.ium were *** highest yiel. was obtained in the direct microwave l.aching of fl.orescent waste with the experimental.conditions of 6 mol.l.HCl.160℃,0.1:10 sol.d-to-l.quid ratio(s:l.,and 90 *** energy cal.ul.tions were made,and kinetic model. of the reactions were obtained,and it is observed that Y and Eu dissol.tion is diffusion-control.ed,on the other hand,l.nthanum(l.),cerium(Ce),and terbium(Tb)were examined to be chemical.reaction ***,cal.ium(Ca)and gadol.nium(Gd)seem coherent with the mixed ***,mathematical.model. of al. experimental.studies are created with the response surface Box-Behnken method and the correl.tion coefficients of al. the model. are over 90%.

关键词： Rare earth el.ments(REEs) Direct microwave l.aching Fl.orescent waste Kinetic model. Response surface method

^(4)He monol.yer on graphene:a quantum monte Carl. study

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Communications in Theoretical.Physics 2024年第9期76卷 149-157页

作者： s Yu m Boninsegni Department of Physics University of AlbertaEdmontonAlbertaT6G 2H5Canada

We revisit the probl.m of adsorption of a singl.^(4)He l.yer on graphene,focusing on the commensurate(C_(1/3))crystal.ine phase,specifical.y on whether it may possess a nonzero superfl.id response,and on the existence of superfl.id phases,either(metastabl.)l.quid or vacancy-doped *** make use of canonical.quantum monte Carl. simul.tions at zero and finite temperature,based on a real.stic microscopic model.of the *** resul.s confirm the absence of any superfl.id response in the commensurate crystal.and that no thermodynamical.y stabl. uniform phase exists at l.wer *** evidence of a possibl. l.ng-l.ved,metastabl. superfl.id phase at C_(1/3)coverage is ***,the resul.s of ground-state projection methods and finite-temperature simul.tions are entirel. consistent.

关键词： superfl.idity l.w-dimensional.systems quantum monte Carl. hel.um supersol.ds

Verdier quotients of homotopy categories of rings and Gorenstein-projective precovers

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science China mathematics 2024年

作者： manuel.cortés-Izurdiaga Departamento de matemática Apl.cada Universidad de Málaga

l.t R be a ring, Proj be the cl.ss of al. the projective right R-modul.s, K be the ful. subcategory of the homotopy category K(Proj) whose cl.ss of objects consists of al. the total.y acycl.c compl.xes, and morK be the cl.ss of al. the morphisms in K(Proj) whose cones bel.ng to K. We prove that if K(Proj) has enough morK-injective objects, then the Verdier quotient K(Proj)/K has smal. Hom-sets, and this l.st condition impl.es the existence of Gorenstein-projective precovers in mod-R and of total.y acycl.c precovers in C(mod-R).

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Advancing towards accurate phenotyping based on metabol.c and fibrosis risk in metabol.c-dysfunction associated steatotic l.ver disease:one step cl.ser to personal.zed care

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Hepatobil.ary surgery and Nutrition 2024年第1期13卷 128-131页

作者： sergio muñoz-m.rtínez Al.a Jiménez-masip Juan m.Pericàs l.ver Unit Vall d’Hebron Hospital UniversitariVall d’Hebron Institut de Recerca(VHIR)Vall d’Hebron Barcelona Hospital CampusBarcelonaSpain Universitat de Barcel.na BarcelonaSpain Universitat Autònoma de Barcel.na BellaterraBarcelonaSpain Centros de Investigación Biomédica en Red Enfermedades Hepáticas y Digestivas(CIBERehd)MadridSpain

Rel.vance of l.ver fibrosis amongst diabetic patients with metabol.c-dysfunction associated steatotic l.ver disease(mAsl.)and knowl.dge gaps Insul.n resistance is paramount in the crosstal. between intrahepatic and extrahepatic pathophysiol.gical.mechanisms l.ading to mAsl.(1),hence gaining special.rel.vance in patients diagnosed with type 2 diabetes(T2D).mAsl. is the term that was recentl. endorsed by an international.mul.idiscipl.nary consensus panel.to repl.ce non-al.ohol.c fatty l.ver disease[as non-al.ohol.c steatohepatitis(NAsH)was repl.ced by metabol.c dysfunction-associated steatohepatitis(mAsH)](2).

关键词： metabol.c-dysfunction associated steatotic l.ver disease(mAsl.) advanced fibrosis type 2 diabetes(T2D) non-invasive tests(NITs)

In search of a pan-coronavirus vaccine:next-generation vaccine design and immune mechanisms

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Cel.ul.r & mol.cul.r Immunol.gy 2024年第2期21卷 103-118页

作者： s.Cankat m.U.Demael.l.swadl.ng Division of Infection and Immunity Institute of Immunity and TransplantationUniversity College LondonPears BuildingLondon NW32PPUK

members of the coronaviridae famil. are endemic to human popul.tions and have caused several.epidemics and pandemics in recent *** this review,we wil. discuss the feasibil.ty of and progress toward the ul.imate goal.of creating a pan-coronavirus vaccine that can protect against infection and disease by al. members of the coronavirus *** wil. detail.the unmet cl.nical.need associated with the continued transmission of sARs-CoV-2,mERs-CoV and the four seasonal.coronaviruses(HCoV-OC43,Nl.3,HKU1 and 229E)in humans and the potential.for future zoonotic *** wil. highl.ght how first-generation sARs-CoV-2 vaccines and natural.history studies have greatl. increased our understanding of effective antiviral.immunity to coronaviruses and have informed next-generation vaccine *** wil. then consider the ideal.properties of a pan-coronavirus vaccine and propose a bl.eprint for the type of immunity that may offer ***,we wil. describe a subset of the diverse technol.gies and novel.approaches being pursued with the goal.of devel.ping broadl. or universal.y protective vaccines for coronaviruses.

关键词： Vaccine Coronavirus Cross-reactive immunity Cross-protection Universal

singl. atom Cu-N-C catal.sts for the el.ctro-reduction of CO_(2) to CO assessed by rotating ring-disc el.ctrode

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Journal.of Energy Chemistry 2024年第1期88卷 169-182,I0004页

作者： s.Pérez-rodríguez m.Gutiérrez-roa C.Giménez-Rubio D.Ríos-Ruiz P.Aréval.-Cid m.V.m.rtínez-Huerta A.Zitol. m.J.l.zaro D.sebastián Instituto de Carboquímica(CsIC) Miguel Luesma Castán 450018 ZaragozaSpain Instituto de Catál.sis y Petrol.oquímica(CsIC) Marie Curie 228049 MadridSpain synchrotron sOl.Il L’Orme des MerisiersDépartementale 12891190France

The el.ctrochemical.CO_(2) reduction reaction(CO_(2)RR) to control.abl. chemical. is considered as a promising pathway to store intermittent renewabl. energy. Herein, a set of catal.sts based on copper-nitrogendoped carbon xerogel.Cu-N-C) are successful.y devel.ped varying the copper amount and the nature of the copper precursor, for the efficient CO_(2)RR. The el.ctrocatal.tic performance of Cu-N-C material. is assessed by a rotating ring-disc el.ctrode(RRDE), technique stil. rarel. expl.red for CO_(2)RR. For comparison, products are al.o characterized by onl.ne gas chromatography in a H-cel.. The as-synthesized Cu-NC catal.sts are found to be active and highl. CO sel.ctive at l.w overpotential.(from -0.6 to -0.8 V ***) in 0.1 m KHCO_(3), whil. H_(2) from the competitive water reduction appears at l.rger overpotential.(-0.9 V vs. RHE). The optimum copper acetate-derived catal.st containing Cu-N_(4) moieties exhibits a CO_(2)-to-CO turnover frequency of 997 h^(-1) at -0.9 V vs. RHE with a H_(2)/CO ratio of 1.8. These resul.s demonstrate that RRDE configuration can be used as a feasibl. approach for identifying el.ctrol.sis products from CO_(2)RR.

关键词： Cu-N-C Carbon xerogel rotating ring disc el.ctrode Carbon dioxide reduction reaction Carbon monoxide

Cr-induced fusion reactions to synthesize superheavy el.ments

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Nucl.ar science and Techniques 2024年第5期35卷 122-130页

作者： s.madhu H.C.manjunatha N.sowmya B.m.Rajesh l.seenappa R.s.susheel. Department of Physics R V College of EngineeringBangalore 560074India Visvesvaraya Technol.gical.University BelagaviKarnataka 590018India Department of Physics Government First Grade CollegeSrinivasapurKarnataka 563135India Department of Physics Government First Grade CollegeDevanahallyKarnataka 562110India Department of Physics Government First Grade CollegeMulbagalKarnataka 563131India Department of Physics Government First Grade collegeNanjangudOoty RoadMysore 571301India

We investigated ^(50,52-54)Cr-induced fusion reactions for the synthesis of the superheavy el.ment in the 104≤Z≤122 *** cross sections produced in this investigation using ^(54)Cr projectil.s were compared with those obtained in prior *** estimated cross sections from this anal.sis are consistent with the findings of prior *** the current study,the predicted cross section was found to be 42fb at 236 meV for ^(53)Cr+^(243)Am,23.2 fb at 236 meV for ^(54)Cr+^(247)Cm,95.6 fb at 240 meV for ^(53)Cr+248Bk,and 1.33 fb at 242 meV for ^(53)Cr+***,these projected cross sections with excitation energy and beam energy wil. be useful.in future Cr-induced fusion reaction investigations.

关键词： Fusion cross sections Compound nucl.us formation probabil.ty survival.probabil.ty Evaporation residue cross sections

Parametric investigation on the novel.and cost-effective nano fl. ash impregnated geopol.mer system for sustainabl. construction

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

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

The hazardous environmental.effects of greenhouse gas emissions and cl.mate change demand al.ernative sources for cementitious material. in the construction *** devel.pment of geopol.mer structures provides a way of producing 100%cement-free *** this research work,a novel.and simpl. way of deriving nano particl.s from waste fl. ash particl.s is *** effect of adding the synthesized nano fl. ash particl.s as a fil.er medium in geopol.mer m.rtars was investigated by considering strength and durabil.ty *** optimization was done by using regression anal.sis on the geopol.mer m.rtar and the impact of adding nano fl. ash particl.s was studied by varying different percentages of addition ranging from 0 to 7.5%by weight of binder *** the resul.s,it was observed that 1%nano fl. ash acted not onl. as a fil.er but al.o as nano-sized precursors of the pol.merization process,resul.ing in denser geopol.mer *** can expl.in the extraordinary gain in strength of 72.11 mPa as wel. as the denser core with negl.gibl. l.vel.of chl.ride ion penetration,making the material.suitabl. for the devel.pment of structures susceptibl. to marine environment.

关键词： geopol.mer nano fl. ash chl.ride ion penetration durabil.ty pol.merization fil.ers