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investig.tion of the transform.tion of org.nic m.tter of carbonate deposits of the Sem.luksky-m.ndym.ky horizon under hydrotherm.l conditions

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Petroleum 2024年第2期10卷 216-223页

作者： S.m.Petrov A.i.Lakhova E.g.m.iseeva A.g.Safiulina institute of Petroleum Chemistry and Nanotechnologies Kazan National Research Technological University institute of g.olog. and Oil and g.s Technolog.es Kazan Federal University

The paper presents the results of studies on the transform.tion of the org.nic m.tter of siliceous-clayey carbonate rocks of the Sem.luksko-m.ndym.ky horizon of the Rom.shkino oil field in a hydrotherm.l fluid for an hour（with a water-to-rock ratio of 33） at 340℃ and 380℃ and pressu res of 17 and 20 *** a result of hydrotherm.l treatm.nt,at 340℃ and 17 m.a,based on nitrog.n porosim.try and electron m.croscopy data,transform.tions of rock-form.ng.m.nerals in the rock are *** lead to an increase in the volum. and averag. diam.ter of m.sopores in it and the form.tion of m.cropores,as well,which im.rove its filtration *** the sam. tim.,the am.unt of kerog.n in the com.osition of the org.nic m.tter decreases and the yield of the petroleum.hydrocarbon extract increases,in which,according.to the SARA analysis,the content of asphaltenes increases and the content of resins,arom.tic and saturated hydrocarbons *** the com.osition of aroatic hydrocarbons,the proportion of a lkyltri m.thyl benzenes and dibenzothiophenes increases,phenanthrene hom.log.es appear,and in the com.osition of saturated hydrocarbons,the am.unt of iso-structure alkanes decreases relative to the content of linear *** the tem.erature and pressure of the hydrotherm.l fluid to 380℃ and 20 m.a increases the deg.ee of kerog.n conversion from.12.4% to 23.6%.At the sam. tim.,chang.s occurring.in the com.onent com.osition of petroleum.hydrocarbon extracts rem.ins sim.lar to the experim.nts carried out at 340℃ and 17 m.a;the content of naphthalenes decreases,the content of dibenzothiophenes increases and C11-C17,C19-C22alkyltrim.thylbenzenes *** to iR spectroscopy,with increasing.tem.erature and pressure of the hydrotherm.l fluid the intensity of the absorption bands of the arom.tic ring.aliphatic frag.0}nts,and oxyg.n-containing.g.oups increases in resins;the structural-g.oup com.osition of asphaltenes chang.s little:arom.ticity and the content of condensed

关键词： Carbonate deposits Org.nic m.tter Hydrotherm.l fluid m.bile hydrocarbons

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Phase com.osition,conductivity,and sensor properties of cerium.doped indium.oxide

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Nano m.terials Science 2024年第2期6卷 193-200页

作者： m.i.ikim.g.N.g.rasim.v V.F.g.om.v O.J.ileg.usi L.i.Trakhtenberg N.N.Sem.nov Federal Research Center for Chem.cal Physics of RAS MoscowRussia University of Central Florida OrlandoFLUSA m.scow institute of Physics and Technolog.(State University) DolgoprudnyMoscow RegionRussia Lom.nosov m.scow State University MoscowRussia

The hydrotherm.l synthesis of in_(2)O_(3)and CeO_(2)–in_(2)O_(3)is investig.ted as well as the properties of sensor layers based on these *** the synthesis of in_(2)O_(3),interm.diate products in(OH)_(3)and inOOH are form.d,which are the precursors of stable cubic(c-in_(2)O_(3))and m.tastable rhom.ohedral(rh-in_(2)O_(3))phases,respectively.A transition from.c-in_(2)O_(3)to rh-in_(2)O_(3)is observed with the addition of CeO_(2).The introduction of cerium.into rh-in_(2)O_(3)results in a decrease in the sensor response to hydrog.n,while it increases in com.osites based on c-in_(2)O_(3).The data on the sensor activity of the com.osites correlate with XPS results in which CeO_(2)causes a decrease in the concentrations of chem.sorbed oxyg.n and oxyg.n vacancies in rh-in_(2)O_(3).The reverse situation is observed in com.osites based on c-in_(2)O_(3).Com.ared to in_(2)O_(3)and CeO_(2)–in_(2)O_(3)obtained by other m.thods,the synthesized com.osites dem.nstrate m.xim.m.response to H_(2)at low tem.eratures by 70–100℃,and have short response tim.(0.2–0.5 s),short recovery tim.(6–7 s),and long.term.stability.A m.del is proposed for the dependence of sensitivity on the direction of electron transfer between in_(2)O_(3)and CeO_(2).

关键词： Cerium.oxide indium.oxide Nanocom.osite Hydrotherm.l m.thod Cubic phase Rhom.ohedral phase Sensor response Conductivity Hydrog.n Response/recovery tim.

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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 hig. frequency devices

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

作者： i.Sardar m.D.Hossain m.S.Sikder m.N.i.Khan m.R.Rahm.n Physics Discipline Khulna UniversityKhulna9208Bangladesh Departm.nt of Physics Khulna University of Engineering&TechnologyKhulna9203Bangladesh Departm.nt ofCom.uter Science and Eng.neering Northern University of Business&Technology KhulnaKhulna9100Bangladesh m.terial Science Division Atomic Energy CentreDhaka1000Bangladesh

Spinel cubic ferrites have hug. applications in m. m.ry and hig. frequency *** the im.rovem.nt of these m.dern devices,the m.g.etic coercivity,perm.ability,and dielectric properties of a ferrite are the im.ortant *** article focuses on im.roving.the m.g.etic coercivity,m.g.etic 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 transform.infrared spectroscopy(FTiR),field em.ssion scanning.electron m.croscopy(FESEm.,energ. dispersive X-ray(EDX),vibrating.sam.le m.g.etom.ter(VSm.,and an im.edance analyzer were used to characterize the structural,m.g.etic,and dielectric properties of the *** XRD patterns indicate the form.tion of spinel cubic structure of the sam.les with a secondary peak(EuFeO_(3))for Eu doped *** densities and porosities of the sam.les follow an inverse trend,where the doped sam.les’lattice param.ters are increased with the increm.nt of rare earth Eu *** FTiR analysis also proves the spinel cubic phase of the *** averag. g.ain size of the ferrites is obtained via FESEm.im.g.s,and it is increased from.121 to 198 *** analysis confirm. that doping.of the Eu content also chang.s other hysteresis 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 sam.les is g.eater than that of the m.ther alloy(x=0.00).The EDX study shows that there is no im.urity contam.nation in the *** perm.ability and dielectric m.asurem.nts show an im.roved quality factor of the Eu-doped sam.les with low m.g.etic and dielectric *** dependent resistivity and im.edance analysis also show the im.roved *** the observed properties of the sam.les,all the investig.ted ferrites m.g.t be strong.candidates for potential applications in m.m.ry devices,m.g.etic sensors,and hig. frequency applications.

关键词： Ferrites Raree arths Coercivity Perm.ability EDX Resistivity

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BaTiO3 solid solutions co-doped with g.3+ and Eu3+:Synthesis,structural evolution and dielectric properties

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Journal of Rare Earths 2024年第10期42卷 1920-1926页

作者： R.m.rtínez-López m.Pérez-Labra J.A.Rom.ro-Serrano F.R.Barrientos-Hernández m.Reyes-Pérez m.i.Valenzuela-Carrillo g.Urbano-Reyes V.E.Reyes-Cruz g.i.Dávila-Pulido Academ.c Area of Earth Sciences and m.terials Autonomous University of Hidalgo State m.tallurg. and m.terials Departm.nt ESIQIE-IPNUPALM Autonom.us University of Coahuila Boulevard Adolfo López Mateos S/n

in this paper,the synthesis,structural evolution,and dielectric properties of BaTiO3solid solutions codoped with rare earth elem.nts(g.3+and Eu3+) prepared using.the solid-state reaction m.thod are *** pure precursor powders of BaCl3,TiO2,g.2O3,and Eu2O3were m.xed in stoichiom.tric proportions,g.ound in an ag.te m.rtar before being.uniaxially pressed at 250 m.a and sintered at 1300℃ in air atm.sphere for 6 h to obtain Ba1-3xg.2xTi1-3xEu4xO3（x=0,0.0015,0.01 and0.1）.X-ray diffraction（XRD） and Rietveld's refinem.nt results reveal the crystal phase ferroelectric tetrag.nal BaTiO3for the sam.les with x=0,0.0015 and 0.01, as well as a consistent increm.nt in the lattice param.ters caused by the *** solubility lim.t of g.3+and Eu3+in the BaTiO3structure is reached for the sam.le with x>0.01,and the orthorhom.ic Eu2TiO5and m.noclinic BaTi2O5secondary phases were *** Ram.n results show the characteristic peaks of ferroelectric tetrag.nal BaTiO3around 716 cm.1（LO of A1 sym.etry）,515 cm.1（TO of A1 sym.etry）,and 305 cm.1（B1）.The m.xim.m.relative perm.ttivity m.asured at 1 kHz was recorded to be 6151.8 for the sam.le with x=0.0015,and a decrease in the Curie tem.erature to 105℃ with respect to the undoped sam.le was *** punctual m.croanalysis for the sam.les with x=0.0015,0.01,and 0.1 reveals g.ains com.osed of Ba,Ti,O,g.,and Eu hom.g.neously distributed in the *** Ba/Ti ratios for sam.les with x=0.0015,0.01 and 0.1 are 2.86,2.91,and 0.68,respectively,indicating.substitution at the Ti site for sam.les with x=0.0015 and 0.01 and a substitution at the Ba site for the sam.le with x=0.1.

关键词： BaTiO3 Doping Europium g.dolinium Rare earths Synthesis

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Effect of solidification cooling.rate on m.crostructure and tribolog. characteristics of Zn-4Si alloy

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international Journal of m.nerals,m.tallurg. and m.terials 2024年第2期31卷 362-373页

作者： F.Akbari m.g.lkaram.S.Beyram. g.Shirazi K.m.ntashloo R.Tag.iabadi m.Sag.afi Yazdi i.Ansarian Departm.nt of m.tallurg. and m.terial Science Imam Khomeini International University(IKIU)Qazvin ***Iran

The m.in objective of this work was to m.dify the m.crostructure and enhance the tribolog.cal properties of a new Zn-4Si al-loy throug. a hig. solidification cooling.rate(SCR).According.to the results,by increasing.the SCR from.2.0 to 59.5℃/s the averag. size of prim.ry Si particles and that of the g.ains reduced from.76.1 and 3780μm.to less than about 14.6 and 460μm.***-ing.the SCR also enhanced the m.crostructural hom.g.neity,decreased the porosity content(by 50%),and increased the m.trix hardness(by 36%).These m.crostructural chang.s enhanced the tribolog.cal *** instance,under the applied pressure of 0.5 m.a,an in-crease in the SCR from.2.0 to 59.5℃/s decreased the wear rate and the averag. friction coefficient of the alloy by 57%and 23%,*** wear m.chanism.was also chang.d from.the severe delam.nation,adhesion,and abrasion in the slowly-cooled alloy to the m.ld tribolayer delam.nation/abrasion in the hig.-cooling.rate-solidified sam.le.

关键词： zinc-silicon alloy prim.ry silicon solidification cooling.rate tribolog. sliding.wear

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Exact solutions for m.g.etohydrodynam.c nanofluids flow and heat transfer over a perm.able axisym.etric radially stretching.shrinking.sheet

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Chinese Physics B 2024年第2期33卷 108-114页

作者： U.S.m.habaleshwar g.P.Vanitha L.m.Pérez Em.d H.Aly i.Pop Departm.nt of Studies in m.them.tics Davangere UniversityShivagangothriDavangereIndia Departam.nto de F´ısica FACIUniversidad de Tarapac´aCasilla 7DAricaChile Departm.nt of m.them.tics Faculty of EducationAin Shams UniversityRoxyCairoEgypt Departm.nt of m.them.tics Babes-Bolyai University400084 Cluj-NapocaRomania

We report on the m.g.etohydrodynam.c im.act on the axisym.etric flow of Al_(2)O_(3)/Cu nanoparticles suspended in H_(2)O past a stretched/shrinked *** the use of partial differential equations and the corresponding.therm.physical characteristics of nanoparticles,the physical flow process is *** resultant nonlinear system.of partial differential equations is converted into a system.of ordinary differential equations using.the suitable sim.larity *** transform.d differential equations are solved *** of the m.g.etic param.ter,solid volum. fraction and stretching.shrinking.param.ter on m.m.ntum.and tem.erature distribution have been analyzed and interpreted *** skin friction and Nusselt num.er were also *** addition,existence of dual solution was deduced for the shrinking.sheet and unique solution for the stretching.***,Al_(2)O_(3)/H_(2)O nanofluid flow has better therm.l conductivity on com.aring.with Cu/H_(2)O ***,it was found that the first solutions of the stream.are stable and physically realizable,whereas those of the second ones are unstable.

关键词： m.g.etohydrodynam.c nanofluid stretching.shrinking.sheet axisym.etric flow analytical solution suction/injection

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Photom.tric Studies of EV Cnc and AH Cnc in the Open Cluster m.7

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Research in Astronom. and Astrophysics 2024年第8期24卷 196-211页

作者： m.m.tha Rani g. K.Sriram.Deblina Lahiri Vijaya,A. Departm.nt of Astronom. Osmania UniversityHyderabad 500007India

Contact binaries at various stag.s of evolution unveil various operating.m.chanism. that drive *** report the photom.tric and period variation analysis of two contact binaries EV Cnc and AH Cnc in open cluster *** observed the cluster from.the JCBT 1.3 m.telescope and utilized TESS and Kepler *** photom.tric solutions of EV Cnc and AH Cnc revealed a m.ss ratio of q~0.41 and~0.15 with an inclination of i=42°and87°*** solutions sug.est that EV Cnc is probably a sem.-detached and AH Cnc is a deep low-m.ss ratio contact *** study of O-C variation analysis indicates that for both system.,the period is increasing.which sug.ests the m.ss transfer is occurring.from.secondary to *** the case of AH Cnc and based on sim.lations by random.y varying.the tim. of m.nim. to fit the LiTE solution,we noted the third body orbital period to be around P_(3)=26.82±2.54 yr,which is different from.earlier reported values and conclude that future observations are required to confirm.this *** com.are these two system. with other sim.lar contact binaries to g.t an estim.te of the final config.ration of the respective system..

关键词： (stars)binaries(including.m.ltiple) close-(stars)binaries eclipsing.stars activity

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Effectiveness of external prestressing.in enhancing.the non-ductile hang.r failure m.chanism.in reinforced concrete inverted T-beam.

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Frontiers of Structural and Civil Eng.neering 2024年第7期18卷 1050-1065页

作者： Ahm.d m.ATTA Reda N.BEHiRY m.ham.ed i.HARAZ Structural Eng.neering.Departm.nt Faculty of EngineeringTanta UniversityTanta 33511Egypt Nile Hig.er institute for Eng.neering.and Technolog. Mansoura 11001Egypt

Recently,inverted T-beam. have been used in reinforced concrete(RC)bridg.s to support transverse precast *** T-beam.,contrary to practice with conventional beam.,are loaded on the flang.s upper *** loading.config.ration causes hang.r failure due to the g.neration of vertical tensile stresses near the bottom.of the *** key purpose of this study is to investig.te the efficiency of vertical external prestressing.stainless-steel bars in m.tig.ting.non-ductile hang.r failure in reinforced concrete inverted *** experim.ntal study on six inverted-T beam.,including.two un-streng.hened specim.ns,was carried *** study showed that the value of the prestressing.level had a considerable im.act on the perform.nce of hang.r m.chanism.in relation to crack pattern,ultim.te loads,cracking.behavior,load-deflection,strains,and *** experim.ntal results indicated that the sug.ested m.thod for streng.hening.inverted T-beam. had efficacy in reducing.the seriousness of the non-ductile hang.r failure and resulted in a streng.h increase of up to 53% when com.ared to that of the un-streng.hened ***,two analytical m.dels for estim.ting.the hang.r capacity and the averag. crack width of the streng.hened RC inverted T-beam. were *** m.dels that were proposed exhibited a hig. deg.ee of ag.eem.nt with the experim.ntal results.

关键词： RC bridg.s inverted T-beam. streng.hening hang.r failure external prestressing

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Hydroxyapatite com.osites with carbon allotropes:Preparation,properties,and applications

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Particuolog. 2024年第5期88卷 239-265页

作者： Boris i.Kharisov Oxana V.Kharissova Lucy T.g.nzález Yolanda Peña m.ndez ig.r E.Uflyand idalia g.m.z de la Fuente Universidad Autónom. de Nuevo León Ave.UniversidadCiudad UniversitariaSan Nicolás de los GarzaNuevo León 66455Mexico Tecnolog.co de m.nterrey Escuela de Ingeniería y CienciasMonterreyNuevo Leon 64890Mexico Departm.nt of Chem.stry Southern Federal UniversityRostov-on-DonRussia

Hydroxyapatite(HA)and its com.osites with inorg.nic additives,dopants,and polym.rs is a rapidly developing.branch in the m.terials *** particular,carbon allotropes are widely used in these com.osites being.widely applied for m.dical *** a g.p of insufficient g.neralization of recent achievem.nts in the field of the HA/Carbon com.osites,in this review we present the state of the art of the field of HA com.osites and hybrids with classic carbon allotropes and *** com.osites are known for carbon nanotubes,nanofibers,g.aphene and its oxidized form.,as well as,in a lesser g.ade,for g.aphite,fullerenes,nanodiam.nds,carbon nanofoam.,*** com.osites can be fabricated by a variety of classic and less-com.on m.thods,such as co-precipitation(with or without ultrasonic treatm.nt),CVD,hot isostatic pressing.hydrotherm.l,spark plasm. sintering.biom.m.tic m.neralization,therm.l and plasm. spray,electrochem.cal and electrophoretic deposition,self-assem.ling.3D printing.electrospinning.and lyophilisation,am.ng.*** of various synthesis techniques can be also carried out for com.osite *** or synthetic HA can be used as it is for further interaction with carbon allotropes or it can be first prepared and then reacted with carbon counterpart;sim.larly,carbon allotropes can be introduced into the interaction with HA directly or they can be first synthesized,in particular from.*** biocom.atible com.osites can be produced in the form.of coating.,powders,and scaffolds and can additionally contain quantitative am.unts of third phases,frequently natural or synthetic *** these com.osites,especially with O-containing.functionalizing.g.oups,HA disadvantag.s could be considerably decreased with sim.ltaneous enhancem.nt of m.chanical properties,becom.ng.sim.lar to hum.n bone,chem.cal stability and biocom.atibility,as well as possessing.antibacterial ***→g.reduction and hig.er HA decoration were obs

关键词： Hydroxyapatite Carbon nanotubes g.aphene Quantum.dots Fullerenes Nanodiam.nds

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Developing.a two-decadal tim.-record of rice field m.ps using.Landsat-derived m.lti-index im.g. collections with a random.forest classifier:A g.og.e Earth Eng.ne based approach

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inform.tion Processing.in Ag.iculture 2024年第2期11卷 260-275页

作者： W.Ashane m.Fernando i.P.Senanayake Departm.nt of Nano Science Technolog. Wayamba University of Sri LankaKuliyapitiya 60200Sri Lanka Dchoolf Eng.neing CllegeoEngineeringSience and EnionmentThe UniversyewcastleCallaghanW2Austraia

Historic m.ps showing.the tem.oral distribution of rice fields are im.ortant for precision ag.iculture,irrig.tion optim.sation,forecasting.crop yields,land use m.nag.m.nt and form.lating.***,m.pping.rice felds using.traditional g.ound surveys is im.ractical when hig. cost,tim. and labour requirem.nts are considered,and the availability of such detailed records is *** satellite rem.te sensing.appears to be a viable solution,conventional seg.0}ntation and classification m.thods with spectral bands are often unable to contrast the distinct characteristics between rice fields and other veg.tation *** this end,we explored a novel,g.og.e Earth Eng.ne(g.E)based m.ltiindex random.forest(RF)classification approach to m.p rice fields over two *** im.g.s from.2000 to 2020 of two Sri Lankan rice cultivation districts were extracted from.g.E and a m.lti-index RF classification alg.rithm.was applied to disting.ish the rice *** results showed above 80%accuracy for both training.and validation,when com.ared ag.inst hig. spatial resolution g.og.e Earth *** essence,m.lti-index sam.ling.and RF tog.ther synerg.sed the com.elling.classifcation accuracy by effectively capturing.veg.tation,water(ponding.and soil characteristics unique to the rice felds using.a sing.e-click *** m.ps developed in this study were further com.ared ag.inst the m.DiS land cover type product(m.D12Q1)and the corresponding.superior statistics on rice fields dem.nstrated the robustness of the proposed *** work seeking.effective index com.inations is recom.ended,and this approach can potentially be extended to other crop analyses elsewhere.

关键词： g.og.e Earth Eng.ne(g.E) im.g. classification Random.forest m.pping.rice fields Tim. series analysis Veg.tation index

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