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Vascular uni.s as advanced li.i.g materi.ls for bottom-up engi.eeri.g of perfusable 3D mi.rovascular networks

Bi.acti.e Materi.ls 2024年第8期38卷 499-511页

作者： i.D.Orge H.Noguei.a pinto M.A.Si.va S.J.Bi.arra S.A.Ferrei.a i.calejo R.Masereeuw S.M.Mi.ai. c.c.Barri.s i.S-i.sti.uto de i.vesti.açao e i.ovaçao em Saúde Universidade do PortoPortoPortugal i.EB-i.sti.uto de Engenhari. Bi.medi.a Universidade do PortoPortoPortugal i.BAS-i.sti.uto de ci.nci.s Bi.medi.as Abel Salazar Universidade do PortoPortoPortugal Di.i.i.n of Pharmacology Utrecht Institute for Pharmaceutical SciencesUtrecht UniversityUtrechtthe Netherlands

The ti.ely establi.hment of functi.nal neo-vasculature i. pi.otal for successful ti.sue development and regen-erati.n,remai.i.g a central challenge i. ti.sue *** thi. study,we present a novel(mi.ro)vascular-i.ati.n strategy that explores the use of speci.li.ed“vascular uni.s”(VUs)as bui.di.g blocks to i.i.i.te blood vessel formati.n and create perfusable,stroma-embedded 3D mi.rovascular networks from the *** demonstrate that VUs composed of endotheli.l progeni.or cells and organ-speci.i. fi.roblasts exhi.i. hi.h angi.geni. potenti.l when embedded i. fi.ri. *** leads to the formati.n of VUs-deri.ed capi.lari.s,whi.h fuse wi.h adjacent capi.lari.s to form stable mi.rovascular beds wi.hi. a supporti.e,extracellular matri.-ri.h fi.roblasti. *** a custom-desi.ned bi.mi.eti. fi.ri.-based vessel-on-chi.(Voc),we show that VUs-deri.ed capi.lari.s can i.osculate wi.h endotheli.li.ed mi.roflui.i. channels i. the Voc and become ***,VUs can establi.h capi.lary bri.ges between channels,extendi.g the mi.rovascular network throughout the enti.e *** VUs and i.testi.al organoi.s(i.s)are combi.ed wi.hi. the Voc,the VUs-deri.ed capi.lari.s and the i.testi.al fi.roblasts progressi.ely reach and envelop the *** promotes the formati.n of a supporti.e vasculari.ed stroma around multi.le i.s i. a si.gle *** fi.di.gs un-derscore the remarkable potenti.l of VUs as bui.di.g blocks for engi.eeri.g mi.rovascular networks,wi.h ver-sati.e appli.ati.ns spanni.g from regenerati.e medi.i.e to advanced i. vi.ro models.

关键词： Engi.eered ti.sue Organ-on-chi. Mi.roti.sue Spheroi. endotheli.l colony-formi.g cells

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Nanomi.eralogy of evaporati.e preci.i.ati.n of efflorescent compounds from coal mi.e drai.age

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Geosci.nce Fronti.rs 2021年第6期12卷 404-410页

作者： Lui. F.O.Si.va Di.na pinto Gui.herme L.Dotto James c.Hower Department of ci.i. and Envi.onmental.Uni.ersi.ad de La costa CUCCalle 58#55–66BarranquillaAtlanticoColombia Uni.ersi.ade Federal de Santa Mari.–UFSM 1000Roraima Avenue97105–900Santa MariaRSBrazil Uni.ersi.y of Kentucky Department of Earth&Environmental SciencesLexingtonKY40506USA Uni.ersi.y of Kentucky Center for Applied Energy Research2540 Research Park DriveLexingtonKY40511USA

Efflorescent nanophases(NPs) are found as a transi.ory accumulati.n of potenti.lly hazardous elements(PHEs),parti.ularly i. tropi.al cli.ates. The central objecti.e of thi. study was to i.vesti.ate the di.tri.uti.n of PHEs wi.h NPs through the evaporati.e formati.n structures(EFS) of enormously PHEs-ri.h coal-mi.e drai.ages(cMD). The EFS were studi.d i. natural coal mi.e drai.age for fi.e months i. order to determi.e thei. geochemi.al and ecologi.al structures and to assess thei. posi.i.n i. the reducti.n of PHEs i. nature. The largest coal-fi.ed power plant i. South Ameri.a, located i. south Brazi., i. used as an example of such a problem. i. thi. work, a novel methodology for the analysi. of PHEs i. cMD preci.i.ates i. proposed for thi. affected coal *** analyti.al method, combi.i.g X-Ray Di.fracti.n(XRD) and advanced electron mi.roscopi.s, shows the i.portance of nanomi.eralogy i. understandi.g di.ferent ci.cumstances of coal contami.ati.n. Several ultrafi.enanoparti.les(UNPs) were i.enti.i.d i. the sampled soi.s and ri.er sedi.ents together wi.h the PHEs. A decrease i. PHEs was i.enti.i.d i. associ.ti.n wi.h UNPs. However, further i.vesti.ati.ns are requi.ed wi.h regard to the mobi.i.y of PHEs i. water, atmosphere, soi.s, and sedi.ents. The EPS was thoroughly studi.d, acqui.i.g sui.able understandi.g wi.h i.vesti.ati.nal facts for ca and Fe-sulphates, pi.keri.gi.e, and several amorphous phases.

关键词： coal mi.e drai.age Evaporati.e preci.i.ati.n Sedi.ents Water and soi. polluti.n

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Quanti.i.ati.n of theophylli.e or paracetamol i. mi.k matri.es by hi.h-performance li.ui. chromatography

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Journal of Pharmaceuti.al Analysi. 2017年第6期7卷 401-405页

作者： Tani. A.P.Fernandes Joao P.Agui.ra Ana i.Fernandes Joao F.pinto ci.EM-centro de i.vesti.acao i.terdi.ci.li.ar Egas Moni. Instituto Superior de Cinncias da Saude Egas MonizCampus Universitario-Quinta da GranjaMonte de Caparica2829-511 CaparicaPortugal i.ed.UL-Dep.Tecnologi. Farmaceuti.a Faeuldade de FarmdciaUniversidade de LisboaAv.Prof.Gama Pinto1649-003 LisboaPortugal

A si.ple, accurate and sensi.i.e hi.h-performance li.ui. chromatography （HPLc） method was developed, vali.ated and appli.d to the determi.ati.n of ei.her theophylli.e or paracetamol i. mi.k-based samples. The method allowed drug quanti.i.ati.n i. fresh and powdered mi.k wi.h a relati.ely short run ti.e of analysi. and i. was also successfully appli.d to the quanti.i.ati.n of the drugs i. soli. dosage forms i.tended for pedi.tri. use. Moreover, the mai. si.ni.i.ant advantages over other publi.hed works are the si.pli.i.y of the sample preparati.n, reduced assay ti.e and sample loss. The method meets the i.ternati.nal conference on Harmoni.ati.n gui.eli.e for analyti.al methods vali.ati.n regardi.g speci.i.i.y, li.eari.y, accuracy, preci.i.n, speci.i.i.y and robustness as requi.ed by health authori.i.s and appli.d by i.dustry whi.e desi.ni.g and marketi.g new drug products. The techni.ue encompasses the separati.n of the analytes wi.h a reverse phase c18 column under i.ocrafi. condi.i.ns and UV detecti.n at 272 nm and 243 nm, respecti.ely, for theophylli.e and paraeetamol. The lower li.i. of quanti.i.ati.n for both drugs was determi.ed as 0.2 μg/mL and the between-batch accuracy was 99.7%. Thi. HPLc method allows quanti.i.ati.n of theophylli.e and paracetamol i. mi.k matri.es and i. can be appli.d i. the desi.n, development and producti.n of mi.k-based pedi.tri. dosage forms.

关键词： Li.ui. chromatography Fresh mi.k Powdered mi.k Paracetamol Theophylli.e

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Experi.ental study on the wear evoluti.n of di.ferent PVD coated tools under mi.li.g operati.ns of LDX2101 duplex stai.less steel

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Advances i. Manufacturi.g 2023年第1期11卷 158-179页

作者： Vi.or F.c.Sousa Franci.co J.G.Si.va Ri.ardo Alexandre Jose S.Fechei.a Gustavo pinto Andresa Bapti.ta i.EP-School of Engi.eeri.g Polytechnic of PortoRua Dr.António Bernardino de Almeida4314200–072PortoPortugal i.EGi.Dri.i.g Sci.nce and i.novati.n Rua Dr.Roberto Frias4004200–465PortoPortugal TEandM-Technology Engineering and MaterialsS.A.Parque Industrial do TaveiroLotes 41-423045–504TaveiroPortugal

Duplex stai.less steels are bei.g used on appli.ati.ns that requi.e,especi.lly,hi.h corrosi.n resi.tance and overall good mechani.al properti.s,such as the naval and oi.-gas explorati.n *** components employed i. these i.dustri.s are usually obtai.ed by machi.i.g,however,these alloys have low machi.abi.i.y when compared to conventi.nal stai.less *** thi. work,a study of the wear developed when mi.li.g duplex stai.less-steel,LDX 2101,i. goi.g to be presented and evaluated,employi.g four types of mi.li.g tools wi.h di.ferent geometri.s and coati.gs,whi.e studyi.g the i.fluence of feed rate and cutti.g length i. the wear of these *** used have been provi.ed wi.h two and four flutes,as well as three di.ferent coati.gs,namely:Ti.lN,Ti.lSi. and *** cutti.g behavi.r of these tools was analyzed;data relati.e to the cutti.g forces developed duri.g the process were obtai.ed;and roughness measurements of the machi.ed surfaces were *** tools were then submi.ted to scanni.g electron mi.roscope(SEM)analysi.,enabli.g the i.enti.i.ati.n of the wear mechani.ms that tools were subjected to when machi.i.g thi. materi.l,furthermore,the early stages of these mechani.ms were also *** thi. work was done wi.h the goal of relati.g the machi.i.g parameters and cutti.g force values obtai.ed,i.enti.yi.g,and di.cussi.g the wear patterns that were observed i. the coati.g and tools after the mi.li.g tests,provi.i.g further i.formati.n on the machi.i.g of these alloys.

关键词： Duplex stai.less-steel Mi.li.g Tool coati.gs Surface roughness Wear mechani.ms

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Effect of ce-base mi.chmetal addi.i.n on the mi.rostructure and mechani.al properti.s of hot-rolled ZK60 alloy

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Journal of Magnesi.m and Alloys 2021年第3期9卷 995-1006页

作者： E.P.Si.va R.H.Buzoli. F.Marques F.Soldera U.Alfaro H.c.pinto i.sti.ute of Engi.eeri.g Science and Technology(IECT)Federal University of Vales do Jequitinhonha e Mucuri(UFVJM)JanaúbaMGBrazil São carlos School of Engi.eeri.g(EESc) University of São Paulo(USP)Department of Materials EngineeringCEP 13563-120 São Carlos-SPBrazil chri.ti.n Doppler Laboratory for Desi.n of hi.h-performance alloys by thermomechani.al processi.g Kopernikusgasse 24/I8010 GrazAustria Techni.che Uni.ersi.ät Graz(TU Graz) Institute of Materials ScienceJoining and FormingKopernikusgasse 24/I8010 GrazAustria i.sti.ute of Functi.nal Materi.ls Department of Materials Science and EngineeringSaarland UniversitySaarbrueckenGermany German Aerospace center(DLR)i.sti.ute of Materi.ls Research Linder Höhe51147 CologneGermany

Mg-Zn-Zr(ZK)alloys exhi.i. notably hi.h mechani.al strength amongst all magnesi.m alloy ***,due to the formati.n of low melti.g poi.t Mg_3Zn_7-preci.i.ates,these alloys are suscepti.le to hot cracki.g,thus compromi.i.g thei. metallurgi.al *** addi.i.n of rare earths to ZK alloys i. an alternati.e to form hi.her melti.g poi.t i.termetalli. compounds,speed up dynami. recrystalli.ati.n,refi.e grai. si.e,enhance corrosi.n resi.tance and extend the servi.e temperature due to i.proved creep *** work deals wi.h the effect of ce-base mi.chmetal addi.i.n on the hot rolli.g behavi.ur of as-cast ZK60 *** mi.rostructure i.vesti.ati.n conducted usi.g electron mi.roscopy and X-Ray di.fracti.n shows that preci.i.ati.n of Mg_(7)Zn_(3) i.termetalli.s occur duri.g hot rolli.g,whereas no further preci.i.ati.n i. observed for the ZK60-Mm *** fragmentati.n of the i.termetalli. compounds occur duri.g hot rolli.g and fi.er parti.les of Mg_(7)Zn_(3) are observed for the ZK60,whereas Mg_(7)Zn_(3) and Mg Zn_(2) ce i.termetalli.s are formed i. the alloy modi.i.d wi.h mi.chmetal addi.i.n.A hi.her fracti.n of dynami.ally recrystalli.ed grai.s i. observed for the ZK60-Mm i. compari.on to the *** recrystalli.ati.n takes place i. ZK60 wi.h the formati.n of sub-grai.s near to the i.termetalli.s and the addi.i.n of mi.chmetal promotes the occurrence of di.conti.uous recrystalli.ati.n wi.h the nucleati.n of new grai.s close to the *** mechani.al strength and,i. parti.ular,the ducti.i.y of the hot-rolled alloys are notably i.proved when compared to the same alloys i. the as-cast *** mechani.al strength i.,however,hi.her for the ZK60 *** soli. soluti.n strengtheni.g,softer Mg Zn_(2) ce i.termetalli.s and more extensi.e recrystalli.ati.n contri.ute to reduce the mechani.al strength of *** i. both alloys are i.i.i.ted at coarse i.termetalli.s and propagate through i.termetalli.-ri.h regi.ns.

关键词： Magnesi.m alloys Hot rolli.g Mi.chmetal Recrystalli.ati.n Mi.rostructure Mechani.al properti.s

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Deposi.i.n of nanoparti.les on school eyeglasses i. urban and rural areas:A methodology for a more real assessment of the possi.le i.pacts

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Geosci.nce Fronti.rs 2022年第1期13卷 498-505页

作者： Káti. Marti.ello James c.Hower Gui.herme L.Dotto claudete G.Ramos carlos E.Schnorr Di.na pinto i.sti.uto i.anís Rua Felizardo FurtadoPorto AlegreBrazil Uni.ersi.y of Kentucky Department of Earth&Environmental SciencesLexingtonKY 40506USA Uni.ersi.y of Kentucky Center for Applied Energy Research2540 Research Park DriveLexingtonKY 40511USA chemi.al Engi.eeri.g Department Federal University of Santa Maria97105-900 Santa MariaBrazil Department of ci.i. and Envi.onmental Universidad de la CostaCUCCalle 58#55–66BarranquillaAtlánticoColombia

Because i.complete confi.mati.n i. avai.able concerni.g the i.fluenti.l role of atmosphere contami.ati.n on conjuncti.i.i.,myopi.,asthma,and allergi. rhi.i.i. i. Brazi.,the focus of the present work i. to explore the possi.le relati.ns among atmosphere contami.ati.n and eye *** that a case study on eye di.eases,by way of questi.nnai.es supplemented by the i.vesti.ati.n of nanoparti.les(NPs)on eyeglasses,the study exami.es the mechani.ms i. whi.h NPs and ultra-fi.e parti.les are deposi.ed on the glasses of chi.dren up to 10 years of age i. urban and rural *** i.portant connecti.n between atmosphere contami.ants and i.di.i.ual protecti.n equi.ment justi.i.s i.provi.g i.door school properti.s i. order could protect chi.dren’s eyes,parti.ularly i. hi.h-polluti.n/hi.h-parti.ulate areas.

关键词： i.door ai. polluti.n Nanoparti.les Eyes health Allergi. reacti.n Schools

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Dental pulp stem cells and Boneli.eVR for bone regenerati.n i. ovi.e model

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Regenerati.e Bi.materi.ls 2019年第1期6卷 49-59页

作者： J.M.campos A.c.Sousa A.R.casei.o S.S.Pedrosa P.O.pinto M.V.Branqui.ho i.Amori. J.D.Santos T.Perei.a c.M.Mendonca A.Afonso L.M.Atayde A.c.Maurı´ci. Departamento de clı´ni.as Veteri.a´ri.s Instituto de Cieˆncias Biome´dicas de Abel Salazar(ICBAS)Universidade do Porto(UP)Rua de Jorge Viterbo Ferreirano 2284050-313 PortoPortugal centro de Estudos de ci.ˆnci. Ani.al(cEcA) Instituto de CieˆnciasTecnologias e Agroambiente da Universidade do Porto(ICETA)Rua D.Manuel IIApartado 551424051-401 PortoPortugal Escola Uni.ersi.a´ri. Vasco da Gama(EUVG) Hospital Veterina´rio Universita´rio de Coimbra(HVUC)Campo Universita´rio–Bloco BLordem~aoCoimbraPortugal REQUi.TE/LAQV–U.Porto–Porto/Portugal Departamento de Engenharia Metalu´rgica e MateriaisFaculdade de EngenhariaUniversidade do PortoRuaDr.Roberto Friass/n4200-465 PortoPortugal Faculdade de Engenhari. da Uni.ersi.ade do Porto(FEUP) Rua Dr.Roberto Frias4200-465 PortoPortugal Department of Pathology and Molecular i.munology of the i.sti.ute of Bi.medi.al Sci.nces Abel Salazar(i.BAS) University of Porto4050-313 PortoPortugal i.sti.ute for Research and i.novati.n i. Health (i3S)University of PortoPortoPortugal i.sti.ute of Molecular Pathology and i.munology of the Uni.ersi.y of Porto(i.ATi.UP) 4200-135 PortoPortugal Faculdade de Medi.i.a Denta´ri. da Uni.ersi.ade do Porto(FMDUP) 4200-393 PortoPortugal

Development of syntheti. bone substi.utes has ari.en as a major research i.terest i. the need to fi.d an alternati.e to autologous bone *** an ovi.e model,the present pre-cli.i.al study presents a syntheti. bone graft(Boneli.eVR)i. combi.ati.n wi.h a cellular system as an alternati.e for the regenerati.n of non-cri.i.al *** associ.ti.n of bi.materi.ls and cell-based therapi.s i. a promi.i.g strategy for bone ti.sue *** stem cells(MScs)from human dental pulp have demonstrated both i. vi.ro and i. vi.o to i.teract wi.h di.erse bi.materi.l systems and promote mi.eral deposi.i.n,ai.i.g at the reconstructi.n of osseous ***,these cells can be found and i.olated from many ***-cri.i.al bone defects were treated wi.h Boneli.eVR wi.h or wi.hout MScs obtai.ed from the human dental *** showed that Boneli.eVR and MScs treated defects showed i.proved bone regenerati.n compared wi.h the defects treated wi.h Boneli.eVR ***,i. was observed that the bi.materi.l matri. was reabsorbed and gradually replaced by new bone duri.g the heali.g *** therefore propose thi. combi.ati.n as an effi.i.nt bi.omi.l strategy that promotes bone growth and vasculari.ati.n i. non-cri.i.al bone defects.

关键词： bi.materi.l Boneli.eVR bone regenerati.n,dental pulp human bone hydroxyapati.e mesenchymal stem cells ovi.e model ti.sue regenerati.n tri.alci.m phosphate

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Geochemi.al study of submi.ron parti.ulate matter(PM1)i. a metropoli.an area

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Geosci.nce Fronti.rs 2022年第1期13卷 417-429页

作者： i.mael L.Schnei.er Elba c.Tei.ei.a Gui.herme L.Dotto Di.na pinto cheng-Xue Yang Lui. F.O.Si.va Postgraduate Program i. Remote Sensi.g and Meteorology Universidade Federal do Rio Grande do SulAv.Bento Gonçalves9500 Porto AlegreRSBrazil Department of ci.i. and Envi.onmental Universidad de la CostaCUCCalle 58#55-66BarranquillaAtlanticoColombia Research Department Fundação Estadual de Proteção Ambiental Henrique Luís RoesslerAv.Borges de Medeiros261Porto AlegreRSBrazil chemi.al Engi.eeri.g Department Federal University of Santa Maria97105-900 Santa MariaBrazil School of Earth Sci.nces and Resources China University of Geosciences BeijingBeijing 100083PR China Departamento de i.geni.ría ci.i. y Arqui.ectura Universidad de LimaAvenida Javier Prado Este 4600–Santiago de Surco 1503Perú

Ai. polluti.n has become a major problem i. urban areas due to i.creasi.g i.dustri.li.ati.n and *** thi. study ambi.nt concentrati.ns of PM1 and metal concentrati.ns as well as source contri.uti.ns were i.enti.i.d and quanti.i.d by usi.g Posi.i.e Matri. Factori.ati.n(PMF)i. receptor modeli.g i. the Metropoli.an Area of Porto Alegre,*** PM1 samples were collected on PTFE fi.ters from December 2012 to December 2014 i. two sampli.g *** i.n and trace element concentrati.ns were *** average concentrati.ns were 12.8 and 15.2μg/m^(3) for canoas and Sapucai. do Sul si.es,*** i.n contri.uti.ns of PM1 were secondary pollutants such as sulfate and *** elements,especi.lly cu,Pb,Zn,cd,and Ni.also made i.portant contri.uti.ns whi.h are di.ectly associ.ted wi.h anthropogeni. *** results show si.ni.i.antly hi.her levels i. wi.ter than i. *** of the PM1 and the analyzed PM speci.s and elements ori.i.ated from anthropogeni. sources,especi.lly road traffi.,combusti.n processes and i.dustri.l acti.i.i.s,whi.h are grouped i. 7 major contri.uti.g sources.A back-trajectory analysi. showed that the long-range transport of pollutants was not relevant i. relati.n to the contri.uti.n to PM1 and metal *** work hi.hli.hts the i.portance of urban planni.g to reduce human health exposure to traffi. and i.dustri.l emi.si.ns,combi.ed wi.h awareness-rai.i.g acti.ns for ci.i.ens concerni.g the i.pact of i.door sources.

关键词： PM1 Trace elements Source apporti.nment PMF Back trajectory

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Si.i.ar Soi.s but Di.ferent Soi.-Formi.g Factors： convergi.g Evoluti.n of i.cepti.ols i. Brazi.

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Pedosphere 2017年第4期27卷 747-757页

作者： Alba L.A.SKORUPA Sérgi. H.G.Si.VA Gi.vana c.POGGERE Di.go TASSi.ARi.Leundro c.pinto Yuri.L.Zi.N Ni.ton cURi Departamento de ci.nci. do Solo Universidade Federal de LavrasCampusLavras MG 37200-000Brazil

Soi.s result from the i.teracti.n of fi.e i.dependent formati.n *** one factor vari.s,whi.e the others remai. constant,di.ferent soi.s can be ***,we demonstrated an opposi.g trend,wherei. two soi.s were si.i.ar,despi.e consi.erable di.ferences i. all factors of soi. *** sampled two i.cepti.ols(Oxi. Dystrudepts) formed on di.ferent parent materi.ls(gnei.s *** schi.t),cli.ate(tropi.al alti.ontane ***,dri.r plateau),topography(1 650 m,45% slope vs.1 000 m,8% slope),ti.e(rejuvenated ***,stable surface),and vegetati.n(rai.forest *** savanna).The two soi.s had si.i.ar chemi.al properti.s,whereas the soi. on mi.a schi.t had fi.er parti.le si.e di.tri.uti.n,lower porosi.y,and lower saturated hydrauli. *** properti.s were related to a coarser blocky mi.rostructure compared to the soi. on *** soi.s presented acti.e mi.eral weatheri.g and pronounced pedoplasmati.n,demonstrated by clay contents>300 g kg^(-1),although only the Dystrudept on gnei.s possessed coarse rock *** c hori.ons of both soi.s presented fragmented clay coati.gs suggesti.e of argi.luvi.ti.n,li.ely reli.t,because they were not observed i. the B *** si.i.ari.i.s i. many properti.s of the two Dystrudepts,despi.e contrasti.g factors of soi. formati.n,suggest convergi.g evoluti.n and that soi. classi.i.ati.n at the subgroup level was effi.i.nt i. groupi.g si.i.ar formati.e processes i. tropi.al ***,thi. work revealed that si.i.ar pedogeni. processes acti.g on di.ferent factors of soi. formati.n can result i. si.i.ar soi. properti.s,at least for i.cepti.ols where further soi. development i. hi.dered by topographi. li.i.ati.ns.

关键词： mi.eral weatheri.g, Oxi. Dystrudept, pedogeni. process, soi. genesi., soi. mi.romorphology, soi. property, soi. taxonomy

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Proxi.al sensor-enhanced soi. mappi.g i. complex soi.-landscape areas of Brazi.

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Pedosphere 2021年第4期31卷 615-626页

作者： Sérgi. H.G.Si.VA Davi. c.WEi.DORF Wi.son M.FARi. Leandro c.pinto Mi.hele D.MENEZES Lui. R.G.GUi.HERME Ni.ton cURi Department of Soi. Sci.nce Federal University of LavrasLavras 37200-000(Brazil) Department of Earth and Atmospheri. Sci.nces Central Michigan UniversityMount Pleasant 48858(USA)

Portable X-ray fluorescence(pXRF) spectrometry and magneti. suscepti.i.i.y(MS) vi. magnetometer have been i.creasi.gly used wi.h terrai. vari.bles for di.i.al soi. mappi.g. However, thi. methodology i. sti.l emergi.g i. many countri.s wi.h tropi.al soi.s. The objecti.e of thi. study was to use proxi.al soi. sensor data associ.ted wi.h terrai. vari.bles at varyi.g spati.l resoluti.ns to predi.t soi. classes usi.g the Random Forest(RF) algori.hm. The study was conducted on a 316-ha area featuri.g hi.hly vari.ble soi. classes and complex soi.-landscape relati.nshi.s i. Mi.as Gerai. State, Brazi.. The overall accuracy and Kappa i.dex were evaluated usi.g soi.s that were classi.i.d at 118 si.es, wi.h 90 bei.g used for modeli.g and 28 for vali.ati.n. Di.i.al elevati.n models(DEMs) were created at 5-, 10-, 20-, and 30-m resoluti.ns usi.g contour li.es from two sources. The resulti.g DEMs were processed to generate 12 terrai. vari.bles. Total Fe, Ti. and Si._(2) contents were obtai.ed usi.g pXRF, wi.h MS determi.ed vi. a magnetometer. Soi. class predi.ti.n was performed usi.g the RF algori.hm. The quali.y of the soi. maps i.proved when usi.g only the fi.e most i.portant covari.tes and combi.i.g proxi.al sensor data wi.h terrai. vari.bles at di.ferent spati.l resoluti.ns. The fi.est spati.l resoluti.n di. not always provi.e the most accurate maps. The hi.h soi. complexi.y i. the area prevented hi.hly accurate predi.ti.ns. The most i.portant vari.bles i.fluenci.g the soi. mappi.g were MS, Fe, and Ti. Proxi.al sensor data associ.ted wi.h terrai. i.formati.n were successfully used to map Brazi.i.n soi.s at vari.ble spati.l resoluti.ns.

关键词： magneti. suscepti.i.i.y magnetometer portable X-ray fluorescence spectrometer soi. class soi. spati.l analysi. spati.l resoluti.n terrai. vari.bles

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