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Adve.se.Pre.nancy Outcome. Following Cryothe.apy, The.mal Ablation and Loop e.e.trosurgical e.cision Proce.ure.for Ce.vical Intrae.ithe.ial Ne.plasia Tre.tme.t: A Pilot Study among Zambian Wome.

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Ope. Journal of Obste.rics and Gyne.ology 2024年第1期14卷 7-17页

作者： Victoria Mwiinga-Kalusopa johanna e. maree Conce.ta Kwale.e.a Patricia Katowa-Mukwato De.artme.t of Basic and Clinical Nursing University of Zambia Lusaka Zambia De.artme.t of Nursing e.ucation University of Witwatersrand Johannesburg Gauteng South Africa School of He.lth Scie.ce. Mulungushi University Kabwe Central Province Zambia

Background: Ce.vical Intrae.ithe.ial ne.plasia tre.tme.ts have.be.ome.e.se.tial inte.ve.tions to manage.ce.vical le.ions. Majority of the.re.ipie.ts of the.e.tre.tme.ts are.wome. within the.re.roductive.age.group, who according to lite.ature.may be.at risk of adve.se.pre.nancy outcome.. This pilot study is part of a study inve.tigating adve.se.pre.nancy outcome. among wome. who re.e.ve. Cryothe.apy, The.mal ablation and Loop e.e.trosurgical e.cision Proce.ure.compare. to the.untre.te. wome. in Zambia. Mate.ials and Me.hods: This de.criptive.study analyze. re.ords of 886 (n = 443 tre.te. and n = 443 untre.te.) wome. age. 15 - 49 ye.rs. The.wome. we.e.e.the. scre.ne. with Visual Inspe.tion with Ace.ic Acid or tre.te. for Ce.vical Intrae.ithe.ial ne.plasia at the.Adult Infe.tious Dise.se.Ce.tre.be.we.n January 2010 and De.e.be. 2020. Wome. me.ting the.crite.ia we.e.ide.tifie. using the.Visual Inspe.tion with Ace.ic Acid scre.ning re.ords and te.e.hone.inte.vie.s to obtain the.adve.se.pre.nancy outcome.e.pe.ie.ce.. Data we.e.analyse. using STATA ve.sion 16 to de.e.mine.the.pre.ale.ce.and obtain fre.ue.cy distribution of outcome. of inte.e.t. Univariate.and multivariable.binary logistic re.re.sion e.timate. odds of adve.se.pre.nancy outcome. across the.thre. tre.tme.ts. Re.ults: The.re.ponde.ts we.e.age. 15 to 49 ye.rs. Adve.se.pre.nancy outcome. we.e.obse.ve. to be.more.pre.ale.t in the.tre.tme.t group (18.5%) compare. to the.untre.te. group (5.4%). Normal pre.nancy outcome. we.e.lowe. in the.tre.te. (46.3%;n = 443) than the.untre.te. (53.7%;n = 443). The.tre.te. group accounte. for the.majority of abortions (85.2%), prolonge. labour (85.7%) and low birth we.ght (80%), whe.e.s, the.untre.te. accounte. for the.majority of still births (72.7%). Wome. tre.te. with cryothe.apy (aOR = 2.43, 95% CI = 1.32 - 4.49, p = 0.004), the.mal ablation (aOR = 6.37, 95% CI = 0.99 - 41.2, p = 0.052) and Loop e.e.trosurgical e.cision Proce.ure.(aOR = 9.67, 95% CI = 2.17 - 43.1, p = 0.003)

关键词： Adve.se.Pre.nancy Outcome. Ce.vical Intrae.ithe.ial Ne.plasia Cryothe.a-py The.mal Ablation Loop e.e.trosurgical e.cision Proce.ure Pilot Re.ro-ductive.Age

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Long-te.m e.ficacy of a compute.-tailore. physical activity inte.ve.tion for prostate.and colore.tal cance. patie.ts and survivors:A randomize. controlle. trial

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运动与健康科学(英文) 2023年第6期12卷 690-704,F0003页

作者： Rianne.He.rica johanna Golste.jn Cathe.ine.Bolman De.ise.Astrid Pe.ls e.me. Volde.s He.n de.Vrie. Lilian Le.hne. De.artme.t of Psychology Open University of the NetherlandsHeerlen6401 DLthe Netherlands De.artme.t of He.lth Promotion Maastricht UniversityMaastricht6200 MDthe Netherlands

Background Physical activity(PA)can improve.the.physical and psychological he.lth of prostate.and colore.tal cance. survivors,but PA be.avior change.mainte.ance.is ne.e.sary for long-te.m he.lth *** is a print-and we.-base. inte.ve.tion in which prostate.and colore.tal cance. patie.ts and survivors re.e.ve.automatically ge.e.ate.,pe.sonalize. fe.dback aime. at inte.rating PA into daily life.to incre.se.and maintain *** e.aluate. the.long-te.m outcome. of OncoActive.by e.amining the.12-month follow-up diffe.e.ce. be.we.n OncoActive.and a control group,and we.e.plore. whe.he. PA was maintaine. during a 6-month non-inte.ve.tion follow-up *** Prostate.or colore.tal cance. patie.ts we.e.randomly assigne. to an OncoActive.n=249)or a usual care.waitlist control group(n=229).OncoActive.participants re.e.ve. PA advice.and a *** outcome.(i.e.,ActiGraph and se.f-re.ort mode.ate.to-vigorous inte.sity PA(MVPA)min/we.k and days with≥30 min PA)and he.lth-re.ate. outcome.(i.e.,fatigue.de.re.sion,physical functioning)we.e.asse.se. at base.ine.6 months,and 12 *** be.we.n groups and change. ove. time.we.e.asse.se. with multile.e. line.r re.re.sions for the.primary outcome.ActiGraph MVPA min/we.k)and all additional *** At 12 months,OncoActive.participants did not pe.form be.te. than control group participants at ActiGraph MVPA min/we.k,se.f-re.ort MVPA min/we.k,or ActiGraph days with *** se.f-re.ort days with PA we.e.significantly highe. in OncoActive.compare. to the.control *** he.lth-re.ate. outcome. only long-te.m fatigue.was significantly lowe. in *** e.plorative.y e.amining PA within OncoActive.the.pre.iously found PA e.fe.ts at the.e.d of the.inte.ve.tion(6 months follow-up)we.e.maintaine. at 12 ***,all PA outcome. improve. significantly from base.ine.to 12 *** control group showe. small but non-significant improve.e.ts from 6 months to 12 months(and from base.ine.to 12 m

关键词： Be.avior change.mainte.ance Cance. survivorship Compute. tailoring e.e.lth Physical activityTage.APTARAe.d

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e.Le. SCHe.e.FOR FRACTIONAL De.AY STOCHASTIC DIFFe.e.TIAL e.UATIONS BY ROUGH PATHS Te.HNIQUe.

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Acta Mathe.atica Scie.tia 2019年第3期39卷 747-763页

作者： johanna GARZON Samy TINDe. Sole.ad TORRe. De.artame.to de.Mate.aticas Universidad Nacional de ColombiaBogota D.C.Colombia De.artme.t of Mathe.atics Purdue University150 N.University StreetW.LafayetteIN 47907USA Facultad de.Inge.ie.za CIMF AV Universidad de ValparaisoCasilla 123-V4059 ValparaisoChile

In this note. we.study a discre.e.time.approximation for the.solution of a class of de.aye. stochastic diffe.e.tial e.uations drive. by a fractional Brownian motion with Hurst parame.e. H ∈(1/2,1). In orde. to prove.conve.ge.ce. we.use.rough paths te.hnique.. The.re.ical bounds are.e.tablishe. and nume.ical simulations are.displaye..

关键词： Fractional Brownian motion stochastic diffe.e.tial e.uations rough paths,discre.e time approximation

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Association be.we.n he.rt failure.se.e.ity and mobility in ge.iatric patie.ts: an in-clinic study with we.rable.se.sors

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Journal of Ge.iatric Cardiology 2022年第9期19卷 660-674页

作者： Tobias Braun Anna Wie.ard johanna Ge.itz Clint Hanse. Kim e.g Tan Hanna Hilde.he.m Je.nife. Kude.ka Corina Mae.zle. Julius We.ze. Robbin Romijnde.s Walte. Mae.zle. Philipp Be.gmann De.artme.t of Ne.rology Kiel UniversityArnold-Heller-Straße 324105 KielGermany De.artme.t of Inte.nal Me.icine.I Christian-Albrechts-University of KielArnold-Heller-Straße 324105 KielGermany De.artme.t of Applie. He.lth Scie.ce. Division of PhysiotherapyHochschule für Gesundheit(University of Applied Sciences)Gesundheits-campus 6-844801 BochumGermany HSD Hochschule.Döpfe.(Unive.sity of Applie. Scie.ce.) Waidmarkt 3 und 950676 CologneGermany

BACKGROUND Individuals with he.rt failure.HF) fre.ue.tly e.pe.ie.ce.limitations in mobility, but spe.ific aspe.ts of the.e.limitations are.not we.l unde.stood. This study inve.tigate. the.association of HF se.e.ity, base. on the.Ne. York He.rt Association(NYHA) classe., with digital mobility outcome.(DMOs) and handgrip stre.gth in olde. inpatie.ts with *** For this e.plorative.analysis, hospital admission and discharge.data from an ongoing, prospe.tive.cohort study we.e.use.. The.sample.include. olde. participants with HF and a sub-sample.of he.rt-he.lthy individuals. Participants we.e.e.uippe. with a we.rable.ine.tial me.sure.e.t unit(IMU) syste. during mobility pe.formance.balancing, sit-to-stand transfe.,walking). We.analyze. the.association be.we.n 17 DMOs and HF se.e.ity with multiple.line.r re.re.sion *** The.total sample.include. 61 olde. participants(65–97 ye.rs of age. 55.7% fe.ale.. Of all DMOs, only sway path in a se.i-tande. stance.position(m/s^(2)) showe. a re.e.ant association with NYHA classe.(admission: β =-0.28, P = 0.09;discharge.β =-0.39, P = 0.02). Handgrip stre.gth showe. a tre.d towards a significant association(admission: β =-0.15, P = 0.10;discharge.β =-0.15, P = 0.19).CONCLUSIONS This is to our be.t knowle.ge.the.first analysis on the.association of HF se.e.ity and IMU-base. DMOs. Sway path and handgrip stre.gth may be.the.most promising parame.e.s for monitoring mobility aspe.ts in tre.tme.t of HF.

关键词： se.e.ity we.r limitations

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Analysis of human brain tissue.de.ive. from DBS surge.y

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Translational Ne.rode.e.e.ation 2022年第1期11卷 625-640页

作者： Salla M.Kangas Jaakko Te.po Maija J.Lahtine. Anu Suoranta Bishwa Ghimire.Pirkko Mattila johanna Uusimaa Markku Varjosalo Jani Katisko Re.tta Hinttala Pe.e.O Re.e.rch Unit University of OuluOuluFinland Me.ical Re.e.rch Ce.te. Oulu University HospitalUniversity of OuluOuluFinland Bioce.te. Oulu University of OuluOuluFinland Institute.of Biote.hnology HiLIFE Helsinki Institute of Life ScienceUniversity of HelsinkiHelsinkiFinland Drug Re.e.rch Program Faculty of PharmacyUniversity of HelsinkiHelsinkiFin-land Ne.rosurge.y Research Unit of Clinical NeuroscienceOulu University HospitalUniversity of OuluOuluFinland Oulu Re.e.rch Group of Advance. Surgical Te.hnologie. and Physics(ORGASTP) Research Unit of Clinical NeuroscienceOulu University HospitalUniversity of OuluOuluFinland Institute.for Mole.ular Me.icine.Finland(FIMM) HiLIFE Helsinki Institute of Life ScienceUniversity of HelsinkiHelsinkiFinland Clinic for Childre. and Adole.ce.ts Division of Pediatric NeurologyOulu University HospitalOuluFinland

Background:Transcriptomic and prote.mic profiling of human brain tissue.is hinde.e. by the.availability of fre.h sample. from living *** sample. usually re.re.e.t the.advance. dise.se.stage.of the.***-the.more.the.postmorte. inte.val can affe.t the.transcriptomic and prote.mic ***,fre.h brain tissue.sample. from living patie.ts re.re.e.t a valuable.re.ource.of me.abolically intact *** of de.p brain stimulation(DBS)e.e.trode. into the.human brain is a ne.rosurgical tre.tme.t for,e.g.,move.e.t ***,we.de.cribe.an improve. approach to colle.ting brain tissue. from surgical instrume.ts use. in implantation of DBS de.ice.for transcriptomics and prote.mics ***:Sample. we.e.e.tracte. from guide.tube. and re.ording e.e.trode. use. in routine.DBS implantation proce.ure.to tre.t patie.ts with Parkinson’s dise.se.ge.e.ic dystonia and *** se.ue.cing was pe.forme. in tissue. e.tracte. from the.re.ording microe.e.trode. and liquid chromatography-mass spe.trome.ry(LC-MS)pe.-forme. in tissue. from guide.*** asse.s the.pe.formance.of the.curre.t approach,the.obtaine. datase.s we.e.compare. with pre.iously publishe. datase.s re.re.e.ting brain ***:Altoge.he.,32,034 RNA transcripts re.re.e.ting the.unique.e.se.bl ge.e.ide.tifie.s we.e.de.e.te. from e.ght sample. re.re.e.ting both he.isphe.e. of four *** using LC-MS,we.ide.tifie. 734 unique.prote.ns from 31 sample. colle.te. from 14 *** datase.s are.available.in the.BioStudie. database.acce.sion numbe. S-BSST667).Our re.ults indicate.that surgical instrume.ts use. in DBS installation re.ain brain mate.ial sufficie.t for prote.n and ge.e.e.pre.sion *** with pre.iously publishe. datase.s obtaine. with similar approach prove. the.robustne.s and re.roducibility of the.***:The.instrume.ts use. during routine.DBS surge.y are.a use.ul source.for obtaining fre.h brain tis-sue. from living patie.

关键词： De.p brain stimulation Move.e.t disorde.s Brain Prote.mics Transcriptomics RNA se.ue.cing LC-MS Pe.sonalize. me.icine

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Comparative.characte.ization of two natural humic acids in the.Pe.rl Rive. Basin, China and the.r e.vironme.tal implications

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Journal of e.vironme.tal Scie.ce. 2010年第11期22卷 1695-1702页

作者： Juan Liu Jin Wang Yonghe.g Che. Holge. Lippold johanna Lippmann-Pipke Ke. Laboratory of Wate. Safe.y and Prote.tion in the.Pe.rl Rive. De.ta Ministry of Education Guangzhou University Guangzhou 510006 China. Forschungze.trum Dre.de. Rosse.dorf Institute of Radiochemistry Research Site Leipzig Leipzig 04318 Germany

Two humic acids （HAs） we.e.isolate. from contaminate. rive. se.ime.ts pre.e.t unde. comparative.conditions in the.Pe.rl Rive. Basin, China. YFHA （the.HA e.tracte. at an ope. pyrite.mining are. in Yunfu） e.hibite. a lowe. absorption inte.sity for ce.tain bands in the.Fourie. transform infrare. spe.tra, a lowe. e.4 /e.6 value.（the.UV absorbance. at 465 nm （e.4 ） and 665 nm （e.6 ））, a lowe. appare.t mole.ular we.ght, a lowe. polarity and a lowe. oxyge. functionality in comparison with GZHA （the.HA isolate. at an urban living are. in Guangzhou）. All the.e.diffe.e.ce. indicate. a highe. de.re. of humification of YFHA than GZHA. Ove.all, the.e.richme.t patte.ns of pe.mane.t he.vy me.als in the.studie. HAs we.e.similar to those.in corre.ponding se.ime.ts. In particular, YFHA e.hibite. high e.richme.t of trace.e.e.e.t Tl, a characte.istic concomitant from the.mining of the.pyrite.mine.als. The.adsorption isothe.ms of two HAs for goe.hite.and pyrolusite. two re.re.e.tative.ge.logical mate.ials, conforme. to the.Langmuir e.uation. Base. on the.qualitative.re.ationships be.we.n the.Langmuir constants of the.adsorption isothe.ms and the.che.ical characte.istics of HAs, the.main me.hanism of HA adsorption on the.e.mate.ials was sugge.te. to be.hydrophobic inte.action. This study highlighte. the.promising use.of HA as a pe.uliar bio-indicator of uncommon trace.me.al contaminations. The.HA adsorption me.hanism on re.re.e.tative.ge.logical mate.ials furthe. provide. a the.re.ical basis for the.study on the.unusual me.al be.avior in comple. e.vironme.tal se.tings.

关键词： humic acid pe.mane.t me.al load adsorption goe.hite pyrolusite

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Optimal microgrid planning for e.hancing ancillary se.vice.provision

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Journal of Mode.n Powe. Syste.s and Cle.n e.e.gy 2019年第4期7卷 862-875页

作者： Se.gio F.CONTRe.AS Camilo A.CORTe. johanna M.A.MYRZIK Institute.of Automation Te.hnology University of BremenOtto-Hahn-Allee 1 NW1/M1050(70)28359 BremenGermany De.artme.t of e.e.trical and e.e.tronics e.gine.ring Universidad Nacional de ColombiaCarrera 30 Calle 45.Ciudad Universitaria Edificio 453Bogota′Colombia

Microgrids have.pre.e.te. the.se.ve. as an e.fe.tive.conce.t to guarante. a re.iable.e.ficie.t and sustainable.e.e.tricity de.ive.y during the.curre.t transition e.a from passive.to active.distribution ***,microgrids could offe. e.fe.tive.ancillary se.vice.(AS)to the.powe. utility,although this will not be.possible.be.ore.the.traditional planning and ope.ation me.hodologie. are.***,a probabilistic multi-obje.tive.microgrid planning(POMMP)me.hodology is propose. in this pape. to conte.plate.the.large.numbe. of variable.,multiple.obje.tive.,and diffe.e.t constraints and unce.taintie. involve. in the.microgrid *** planning me.hodology is base. on the.optimal size.and location of e.e.gy distribute. re.ource. with the.goal of minimizing the.mismatch powe. in islande. mode.while.the.re.idual powe. for AS provision and the.inve.tme.t and ope.ation costs of the.microgrid in grid-conne.te. mode.are.maximize. and minimize.,*** that purpose.probabilistic mode.s and a true.multi-obje.tive.optimization proble. are.imple.e.te. in the.*** me.hodology is te.te. in an adapte. PG&e.69-bus distribution syste. and the.non-dominate. sorting ge.e.ic algorithmⅡ(NSGA-Ⅱ)optimization me.hod and an analytic hie.archy proce.s for de.ision-making are.use. to solve.the.optimization proble..

关键词： Microgrid Ancillary se.vice.(AS) Planning Multi-obje.tive optimization De.ision-making

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Quantifying te.poral change. in Tornionjoki rive. ice.bre.kup date. and spring te.pe.ature. in Lapland since.1802

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Journal of Ge.graphical Scie.ce. 2013年第6期23卷 1069-1079页

作者： Samuli He.AMA Jianmin JIANG johanna KORHONe. Jari HOLOPAINe. Mauri TIMONe. Finnish Fore.t Re.e.rch Institute Rovaniemi Northern Unit 96300 Finland Training Ce.tre.of China Me.e.rological Administration Beijing 100081 China Finnish e.vironme.t Institute Helsinki P.O. Box 140 00251 Finland De.artme.t of Ge.scie.ce. and Ge.graphy University of Helsinki Helsinki P.O. Box 64 00014 Finland

Cryophe.ological re.ords （i.e. obse.vational se.ie. of fre.ze.and bre.kup date. of ice. are.of gre.t importance.whe. asse.sing the.e.vironme.tal variations in cold re.ions. He.e.we.e.ploye. the.e.traordinarily long obse.vational re.ords of rive. ice.bre.kup date. and air te.pe.ature. in northe.n Fe.noscandia to e.amine.the.r inte.re.ations since.1802. Historical obse.vations, along with mode.n data, comprise.the.informational se.ting for this analysis carrie. out using t-te.t. Te.pe.ature.history of April-May se.son was use. as cli- matic counte.part for the.bre.kup timings. Both re.ords （te.pe.ature.and bre.kup） showe. se.e. sub-pe.iods during which the.r local me.ns we.e.distinctly diffe.e.t re.ative.to pre.e.- ing and subse.ue.t sub-pe.iods. The.starting and e.ding ye.rs of the.e.sub-pe.iods oc- curre. in te.poral agre.me.t. The.main findings of this study are.summarize. as follows：（1） the.synchrony be.we.n the.te.pe.ature.and rive. ice.bre.kup re.ords rule. out the.possibility that the.change. would have.occurre. due.to quality of the.historical se.ie. （i.e. inhomoge. ne.ty proble.s ofte. linke. to historical time.se.ie.）; （2） the.studie. re.ords agre.d to show lowe. spring te.pe.ature. and late. rive. ice.bre.kups during the.19th ce.tury, in comparison to the.20th ce.tury conditions, e.ide.cing the.pre.ale.ce.of coole. spring te.pe.ature. in the.study re.ion, in agre.me.t with the.conce.t of the.Little.Ice.Age.（1570-1900） climate.in North-We.t e.rope. （3） the.most re.e.t sub-pe.iod de.onstrate.the.highe.t spring te.- pe.ature. with concomitantly e.rlie.t rive. ice.bre.kups, showing the.re.ative.warmth of the.curre.t springtime.climate.in the.study re.ion in the.conte.t of the.past two ce.turie.; （4） the.e.fe.ts of anthropoge.ic change. in the.rive. e.vironme.t （e.g. construction and de.olition of dams） during the.20th ce.tury should be.conside.e. for non-climatic variations in the.bre.kup re.ords; （5） this study e.phasize. the.importance.of multi-ce.turial （i.

关键词： climatic change historical climatology Lapland Little.Ice.Age phe.ology

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The.importance.of grain and cut-off size.in shaping tre. be.a dive.sity along an e.e.ational gradie.t in the.northwe.t of Colombia

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Fore.t e.osyste.s 2020年第1期7卷 14-25页

作者： johanna Andre. Martíne.-Villa Se.astián Gonzále.-Caro álvaro Duque De.artame.to de.Cie.cias Fore.tale. Universidad Nacional de Colombia sede MedellínCra.65#59a-110MedellínColombia Départe.e.t de. Scie.ce. Biologique. Universitédu QuébecàMontréal141Avenue du Président-KennedyMontrealCanada

Background:Spe.ie. turnove.(β-dive.sity)along e.e.ational gradie.ts is one.of the.most important conce.ts in plant ***,the.e.is a lack of conse.sus about the.main driving me.hanisms of tre.β-dive.sity at local scale. in ve.y dive.se.e.osyste.s(e.g.,Ande.n mountains),as we.l as how the.sampling e.fe.t can alte.β-dive.sity ***,it has be.n hypothe.ize. that patte.ns of change.inβ-dive.sity at local scale. along e.e.ational gradie.ts are.drive. by sampling e.fe.ts ste.ming from diffe.e.ce. in the.size.of the.spe.ie. pool rathe. than by unde.lying community asse.bly ***,we.aim to e.aluate.the.re.ative.e.te.t to which sampling e.fe.ts,such as spe.ie. pool size.grain size.and tre. size.cut-off,de.e.mine.spe.ie. sorting,and thus,the.variability ofβ-dive.sity at local scale. along e.e.ational gradie.ts in the.northwe.t of ***:Using 151-ha pe.mane.t plots spre.d out along a 3000m e.e.ational gradie.t,we.use. standardize.β-de.iation to asse.s the.e.te.t to which e.the. sampling e.fe.ts or the.community asse.bly me.hanisms de.e.mine.the.change. in spe.ie. composition at local ***β-de.iation was me.sure. as the.diffe.e.ce.be.we.n the.obse.ve. and nullβ-dive.sity divide. by the.standard de.iation of the.nullβ-*** found that the.magnitude.of change.in localβ-de.iation along the.e.e.ational gradie.t was significant and de.e.de.t on the.e.ploye. spatial grain size.and tre. size.***,β-de.iation incre.se. with e.e.ation in all sampling de.igns,which sugge.ts that unde.lying community asse.bly me.hanisms play a ke. role.in shaping localβ-dive.sity along the.e.e.ational ***:Our findings sugge.t that grain size.e.large.e.t and the.inclusion of tre.s with small diame.e.s will improve.our ability to quantify the.e.te.t to which the.community asse.bly me.hanisms shape.patte.ns ofβ-dive.sity along e.e.ational ***,we.e.phasize.the.scale.de.e.de.t nature.of the.asse.sme.t o

关键词： Ande.n fore.ts Null mode.s Spe.ie. pool Spe.ie. sorting Sampling e.fe.t

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The.re.ical pre.iction,synthe.is,and crystal structure.de.e.mination of ne. MAX phase.compound V2SnC

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Journal of Advance. Ce.amics 2020年第4期9卷 481-492页

作者： Qiang Xu Yanchun Zhou Haiming Zhang Anna Jiang Quanzhe.g Tao Jun Lu johanna Rosén Yunhui Niu Salvatore.Grasso Chunfe.g Hu Ke. Laboratory of Advance. Te.hnologie. of Mate.ials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu610031China Scie.ce.and Te.hnology on Advance. Functional Composite.Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing100076China School of Me.hanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing100044China Thin Film Physics Division Department of PhysicsChemistryand Biology(IFM)Linköping UniversityLinköpingSE-58183Sweden State.Ke. Laboratory of e.vironme.t-frie.dly e.e.gy Mate.ials Southwest University of Science and TechnologyMianyang621010China

Guide. by the.the.re.ical pre.iction,a ne. MAX phase.V2SnC was synthe.ize. e.pe.ime.tally for the.first time.by re.ction of V,Sn,and C mixture. at 1000°*** che.ical composition and crystal structure.of this ne. compound we.e.ide.tifie. by the.cross-che.k combination of first-principle. calculations,X-ray diffraction(XRD),e.e.gy dispe.sive.X-ray spe.troscopy(e.S),and high re.olution scanning transmission e.e.tron microscopy(HR-STe.).The.stacking se.ue.ce.of V2C and Sn laye.s re.ults in a crystal structure.of space.group P63/*** a-and c-lattice.parame.e.s,which we.e.de.e.mine. by the.Rie.ve.d analysis of powde. XRD patte.n,are.0.2981(0)nm and 1.3470(6)nm,*** atomic positions are.V at 4f(1/3,2/3,0.0776(5)),Sn at 2d(2/3,1/3,1/4),and C at 2a(0,0,0).A ne. se. of XRD data of V2SnC was also *** calculations sugge.t that this ne. compound is stable.with ne.ative.formation e.e.gy and formation e.thalpy,satisfie. Born-Huang crite.ia of me.hanical stability,and positive.phonon branche. ove. the.Brillouin *** also has low she.r de.ormation re.istance.c44(se.ond-orde. e.astic constant,cij)and she.r modulus(G),positive.Cauchy pre.sure.and low Pugh’s ratio(G/B=0.500e.arde. as a quasi-ductile.MAX *** me.hanism unde.pinning the.quasi-ductility is associate. with the.pre.e.ce.of a me.allic bond.

关键词： V2SnC ne. MAX phase.compound crystal structure first-principle. calculations

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