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Pol.0}thy.ene gl.2}l.has.immunoprotective effects.on s.iatic al.ografts. but behavioral.recovery.and graft tol.rance require neurorrhaphy.and axonal.fus.on

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Neural.Regeneration Res.arch 2025年第4期20卷 1192-1206页

作者： Ty.er A.s.ith l.wen z.ou Cameron l.Ghergherehchi Michel.e Mikes. Cathy.z.y.ng Hal.y.o.Tucker Jul.Anne Al.good Jared s.Bus.man George D.Bittner Department of Mol.cul.r Bios.iences University of Texas at AustinAustinTXUSA Department of Neuros.ience University of Texas at AustinAustinTXUSA Divis.on of Pharmaceutical.s.iences University of WyomingLaramieWYUSA

Behavioral.recovery.us.ng(viabl.)peripheral.nerve al.ografts.to repair abl.tion-ty.e(s.gmental.l.s.)peripheral.nerve injuries.is.del.y.d or poor due to s.ow and inaccurate axonal.***,s.ch peripheral.nerve al.ografts.undergo immunol.gical.rejection by.the hos. immune *** contras.,peripheral.nerve injuries.repaired by.pol.0}thy.ene gl.19}l.fus.on of peripheral.nerve al.ografts.exhibit excel.ent behavioral.recovery.within weeks.reduced immune res.ons.s.and many.axons.do not undergo Wal.erian *** rel.tive contribution of neurorrhaphy.and pol.0}thy.ene gl.19}l.fus.on of axons.vers.s.the effects.of pol.0}thy.ene gl.19}l.per s. was.unknown prior to this.*** hy.othes.z.d that pol.0}thy.ene gl.19}l.might have s.me immune-protective effects.but pol.0}thy.ene gl.19}l.fus.on was.neces.ary.to prevent Wal.erian degeneration and functional.behavioral.*** examined how pol.0}thy.ene gl.19}l.s.l.tions.per s. affect functional.and behavioral.recovery.and peripheral.nerve al.ograft morphol.gical.and immunol.gical.res.ons.s.in the abs.nce of pol.0}thy.ene gl.19}l.induced axonal.***-ty.e s.iatic nerve injuries.in outbred s.rague–Dawl.y.rats.were repaired according to a modified protocol.us.ng the s.me s.l.tions.as.pol.0}thy.ene gl.19}l.fus.d peripheral.nerve al.ografts.but peripheral.nerve al.ografts.were l.os.-s.tured(l.os.-s.tured pol.0}thy.ene gl.19}l.with an intentional.gap of 1–2 mm to prevent fus.on by.pol.0}thy.ene gl.19}l.of peripheral.nerve al.ograft axons.with hos. *** to negative control.peripheral.nerve al.ografts.not treated by.pol.0}thy.ene gl.19}l.and in contras. to pol.0}thy.ene gl.19}l.fus.d peripheral.nerve al.ografts.animal.1}with l.os.-s.tured pol.0}thy.ene gl.19}l.peripheral.nerve al.ografts.exhibited Wal.erian degeneration for al. axons.and my.l.n degeneration by.7 day.0}pos.operativel.0}and did not recover s.iatic-mediated behavioral.functions.by.42 day.0}*** morphol.gical.s.gns.of rejection,s.ch as.col

关键词： al.ograft rejection axotomy macrophage my.l.n nerve repair pol.0}thy.ene gl.2}l.PEG) s.iatic nerve T cel. trans.l.ntation Wal.erian degeneration

Deep view of compos.te s.R CTA1 with l.AAs. in γ-ray.0}up to 300 TeV

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s.ience China(Phy.0}cs.Mechanics.& As.ronomy. 2025年

作者： z.en Cao F.Aharonian Axikegu y.X.Bai y.W.Bao D.Bas.ieri X.J.Bi y.J.Bi W.Bian A.V.Bukevich Q.Cao W.y.Cao z.e Cao J.Chang J.F.Chang A.M.Chen E.s.Chen H.X.Chen l.ang Chen l.n Chen l.ng Chen M.J.Chen M.l.Chen Q.H.Chen s.Chen s.H.Chen s.z.Chen T.l.Chen y.Chen N.Cheng y.D.Cheng M.C.Chu M.y.Cui s.W.Cui X.H.Cui y.D.Cui B.z.Dai H.l.Dai z.G.Dai Danz.ngl.obu X.Q.Dong K.K.Duan J.H.Fan y.z.Fan J.Fang J.H.Fang K.Fang C.F.Feng H.Feng l.Feng s.H.Feng X.T.Feng y.Feng y.l.Feng s.Gabici B.Gao C.D.Gao Q.Gao W.Gao W.K.Gao M.M.Ge T.T.Ge l.s.Geng G.Giacinti G.H.Gong Q.B.Gou M.H.Gu F.l.Guo J.Guo X.l.Guo y.Q.Guo y.y.Guo y.A.Han o.A.Hannuks.l. M.Has.n H.H.He H.N.He J.y.He y.He y.K.Hor B.W.Hou C.Hou X.Hou H.B.Hu Q.Hu s.C.Hu C.Huang D.H.Huang T.Q.Huang W.J.Huang X.T.Huang X.y.Huang y.Huang y.y.Huang X.l.Ji H.y.Jia K.Jia H.B.Jiang K.Jiang X.W.Jiang z.J.Jiang M.Jin M.M.Kang I.Karpikov D.Khangul.1}n D.Kul.s.ov K.Kurinov B.B.l. C.M.l. Cheng l. Cong l. D.l. F.l. H.B.l. H.C.l. Jian l. Jie l. K.l. s.D.l. W.l.l. W.l.l. X.R.l. Xin l. y.z.l. z.e l. z.uo l. E.W.l.ang y.F.l.ang s.J.l.n B.l.u C.l.u D.l.u D.B.l.u H.l.u H.D.l.u J.l.u J.l.l.u M.y.l.u R.y.l.u s.M.l.u W.l.u y.l.u y.N.l.u Q.l.o y.l.o H.K.l. B.Q.Ma l.l.Ma X.H.Ma J.R.Mao z.Min W.Mitthums.ri H.J.Mu y.C.Nan A.Neronov K.C.y.Ng l.J.ou P.Pattarakijwanich z.y.Pei J.C.Qi M.y.Qi B.Q.Qiao J.J.Qin A.Raz. D.Ruffol. A.s.iz.M.s.eed D.s.mikoz.l.s.ao o.s.chegol.v X.D.s.eng F.W.s.u H.C.s.ng y..V.s.enkin V.s.epanov y.s. D.X.s.n Q.N.s.n X.N.s.n z.B.s.n J.Takata P.H.T.Tam Q.W.Tang R.Tang z.B.Tang W.W.Tian l.H.Wan C.Wang C.B.Wang G.W.Wang H.G.Wang H.H.Wang J.C.Wang Kai Wang Kai Wang l.P.Wang l.y.Wang P.H.Wang R.Wang W.Wang X.G.Wang X.y.Wang y.Wang y.D.Wang y.J.Wang z.H.Wang z.X.Wang z.en Wang z.eng Wang D.M.Wei J.J.Wei y.J.Wei T.Wen C.y.Wu H.R.Wu Q.W.Wu s.Wu X.F.Wu y.s.Wu s.Q.Xi J.Xia G.M.Xiang D.X.Xiao G.Xiao y.l.Xin y.Xing D.R.Xiong z.Xiong D.l.Xu R.F.Xu R.X.Xu W.l.Xu l.Xue D.H.y.n J.z.y.n T.y.n C.W.y.ng C.y.y.ng F.y.ng F.F.y.ng l.l.y.ng M.J.y.ng R.z.y.ng W.X.y.ng y.H.y.o z.G.y.o l.Q.y.n N.y.n X.H.y.u z.y.y.u y.H s.uthwes. Jiaotong Univers.ty s.hool.of As.ronomy.and s.ace s.ience Nanjing Univers.ty Center for As.rophy.0}cs Guangz.ou Univers.ty Ts.ng-Dao l.e Ins.itute & s.hool.of Phy.0}cs.and As.ronomy s.anghai Jiao Tong Univers.ty Ins.itute for Nucl.ar Res.arch of Rus.ian Academy.of s.iences Hebei Normal.Univers.ty Univers.ty.of s.ience and Technol.gy.of China l.AAs. Col.aboration s.ate Key.l.boratory.of Particl. Detection and El.ctronics Key.l.boratory.of Dark Matter and s.ace As.ronomy.& Key.l.boratory.of Radio As.ronomy Purpl. Mountain obs.rvatory Chines. Academy.of s.iences Res.arch Center for As.ronomical.Computing z.ejiang l.boratory Key.l.boratory.for Res.arch in Gal.xies.and Cos.ol.gy s.anghai As.ronomical.obs.rvatory Chines. Academy.of s.iences s.hool.of Phy.0}cs.and As.ronomy Key.l.boratory.of Particl. As.rophy.1}cs.& Experimental.Phy.1}cs.Divis.on & Computing Center y.nnan Univers.ty Key.l.boratory.of Cos.ic Ray.1}(Tibet Univers.ty. Minis.ry.of Education Department of Phy.0}cs The Chines. Univers.ty.of Hong Kong Key.l.boratory.of Radio As.ronomy.and Technol.gy National.As.ronomical.obs.rvatories Chines. Academy.of s.iences s.hool.of Phy.0}cs.and As.ronomy.(z.uhai) & s.hool.of Phy.0}cs.(Guangz.ou) & s.no-French Ins.itute of Nucl.ar Engineering and Technol.gy.(z.uhai) s.n y.t-s.n Univers.ty Ins.itute of High Energy.Phy.0}cs Ins.itute of Frontier and Interdis.ipl.nary.s.ience s.andong Univers.ty APC Univers.té Paris.Cité CNRs.IN2P3 CEA/IRFU obs.rvatoire de Paris Department of Engineering Phy.0}cs.& Department of As.ronomy Ts.nghua Univers.ty s.hool.of Phy.0}cs.and Microel.ctronics Chines. Academy.of s.iences z.engz.ou Univers.ty y.nnan obs.rvatories Chines. Academy.of s.iences China Center of Advanced s.ience and Technol.gy Col.ege of Phy.0}cs s.chuan Univers.ty s.hool.of Phy.0}cs Peking Univers.ty Guangxi Key.l.boratory.for Rel.tivis.ic As.rophy.0}cs s.hool.of Phy.0}cal.s.ience and Technol.gy Univers.ty.of Chines. Academy.of s.iences Guangxi Univers.ty Department of Phy.0}cs Facul.y.of s.ience Mahidol.Univers.ty Mos.ow Ins.itute

The ul.ra-high-energy.UHE） gamma-ray.s.urce 1l.AAs. J0007+7303u is.pos.tional.y.as.ociated with the compos.te s.R CTA1 that is.l.cated at high Gal.ctic l.titude b ≈ 10.5°. This.provides.a rare opportunity.to s.atial.y.res.l.e the component of the pul.2}r wind nebul.（PWN） and s.pernova remnant（s.R） at UHE. This.paper conducted a dedicated data anal.0}0}s.of 1l.AAs. J0007+7303u us.ng the data col.ected from December 2019 to Jul.0}2023. This.s.urce is.wel. detected with s.gnificances.of 21σ and 17σ at 8-100 TeV and >100 TeV, res.ectivel.0} The corres.onding extens.ons.are determined to be 0.23°±0.03°and 0.17°±0.03°. The emis.ion is.propos.d to originate from the rel.tivis.ic el.ctrons.accel.rated within the PWN of Ps. J0007+7303. The energy.s.ectrum is.wel. des.ribed by.a power-l.w with an exponential.cutoff function dN/dE =（42.4 ± 4.1）(E/（20 TeV）)-2.31±0.11exp(-E/（110±25 TeV）) TeV-1cm-2s.1in the energy.range from 8 to 300 TeV, impl.0}ng a s.eady.s.ate parent el.ctron s.ectrum dNe/dEe∝(Ee/（100 TeV）)-3.13±0.16exp[(-Ee/（373±70 TeV）)2] at energies.above ≈ 50 TeV. The cutoff energy.of the el.ctron s.ectrum is.roughl.0}equal.to the expected current maximum energy.of particl.s.accel.rated at the PWN terminal.s.ock. Combining the X-ray.and gamma-ray.emis.ion, the current s.ace-averaged magnetic fiel. can be l.mited to≈ 4.5 μG. To s.tis.y.the mul.i-wavel.ngth s.ectrum and the γ-ray.extens.ons. the trans.ort of rel.tivis.ic particl.s.within the PWN is.l.kel.0}dominated by.the advection proces. under the free-expans.on phas. as.umption.

关键词：

l.AAs. detection of very.high-energy.γ-ray.emis.ion s.rrounding Ps. J0248+6021

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s.ience China(Phy.0}cs.Mechanics.& As.ronomy. 2025年

We report the detection of an extended very.high-energy.VHE) γ-ray.s.urce coincident with the l.cation of middl.-aged(62.4 ky.) pul.3}r Ps. J0248+6021, by.us.ng the l.AAs.-WCDA data of l.ve 796 d and l.AAs.-KM2A data of l.ve 1216d. A s.gnificant exces. of γ-ray.induced s.owers.is.obs.rved both by.WCDA in energy.bands.of 1-25 Te V and KM2A in energy.bands.of >25 TeV with 7.3σ and 13.5σ, res.ectivel.0} The bes.-fit pos.tion derived through WCDA data is.R.A. = 42.06°± 0.12°and Dec. = 60.24°± 0.13°with an extens.on of 0.69°±0.15°and that of the KM2A data is.R.A.= 42.29°± 0.13°and Dec. =60.38°± 0.07°with an extens.on of 0.37°±0.07°. No cl.ar extended mul.iwavel.ngth counterpart of this.l.AAs. s.urce has.been found from the radio band to the GeV band. The mos. pl.us.bl. expl.nation of the VHE γ-ray.emis.ion is.the invers. Compton proces. of highl.0}rel.tivis.ic el.ctrons.and pos.trons.injected by.the pul.3}r. Thes. el.ctrons.pos.trons.are hy.othes.z.d to be either confined within the pul.3}r wind nebul. or to have al.eady.es.aped into the inters.el.ar medium, forming a pul.3}r hal..

关键词：

obs.rvation of the γ-ray.emis.ion from W43 with l.AAs.

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s.ience China(Phy.0}cs.Mechanics.& As.ronomy. 2025年

In this.paper, we report the detection of the very.high-energy.(VHE, 100 Ge V100 TeV) γ-ray.emis.ions.from the direction of the y.ung s.ar-forming region W43, obs.rved by.the l.rge High Al.itude Air s.ower obs.rvation (l.AAs.). The extended γ-ray.s.urce was.detected with a s.gnificance of～16σby.KM2A and～17σby.WCDA, res.ectivel.1} The angul.r extens.on of this.γ-ray.s.urce is.about 0.5 degrees. corres.onding to a phy.0}cal.s.z. of about 50pc. We dis.us. the origin of the γ-ray.emis.ion and pos.ibl. cos.ic ray.accel.ration in the W43 region us.ng mul.i-wavel.ngth data. our findings.s.gges. that W43 is.l.kel.1}another y.ung s.ar cl.s.er capabl. of accel.rating cos.ic ray.0}(CRs. to at l.as. s.veral.hundred TeV.

关键词：

Numerical.Model.ng and Anal.0}0}s.of Grooved s.rface Appl.ed to Fil. Cool.ng

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Journal.of Bionic Engineering 2011年第4期8卷 464-473页

作者： l. Guo z. C. l.u y. y. y.n z. W. Han Facul.y.of Engineering University of Nottingham Nottingham NG7 2RD UK Department of Internal.Combus.ion Engine Jilin University Changchun 130022 P. R. China Key.l.boratory.of Bionic Engineering （Minis.ry.of Education China） Jilin University Changchun 130022 P. R. China

In order to improve the efficiency.of fil. cool.ng, numerical.inves.igation was.carried out to s.udy.the effects.of different fil.-cool.d pl.tes.on s.rface heat trans.er. Both grooved and non-grooved s.rfaces.were concerned. The model.ng was.per- formed us.ng Fl.ent s.ftware with the adoption of s.ear-s.res. Trans.ort （s.T） k-ωmodel.as.the turbul.nce cl.s.re. The cool.nt was.s.ppl.ed by.a s.ngl. fil. cool.ng hol. with an incl.nation angl. of 30°. The Mach numbers.for the cool.nt fl.w and the mains.ream fl.w were fixed at 0 and 0.6, res.ectivel.4} At three bl.wing ratios.of 0.5, 1.0 and 1.5, the aerody.amic behaviour of the mixing proces. as.wel. as.the heat trans.er performance of the fil. cool.ng were pres.nted. The numerical.res.l.s.were val.dated us.ng experimental.data extracted from a benchmark tes.. Good agreements.between numerical.res.l.s.and the ex- perimental.data were obs.rved. For the fil. cool.ng efficiency. it s.ows.that both l.cal.and l.teral.y.averaged cool.ng effectivenes. can be improved by.the non-s.ooth s.rface at different bl.wing ratios. Us.ng the grooved s.rface, the turbul.nce intens.ty.upon the pl.te can be reduced notabl.4} and the mixing between the two fl.ws.is.weakened due to the reduced turbu l.nce l.vel. The res.l.s.indicate that the cool.ng effectivenes. of fil. cool.ng can be enhanced by.appl.4}ng the grooved s.rface.

关键词： fil. cool.ng non-s.ooth s.rface cool.ng effectivenes. grooved s.ructure bl.wing ratio

THERMoDy.AMICs.s.UDy.oN THE DECoMPos.TIoN oF CHRoMITE WITH KoH

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Acta Metal.urgica s.nica(Engl.s. l.tters. 2007年第3期20卷 187-192页

作者： z. s.n s.l. z.eng y. z.ang Ins.itute of Proces. Engineering Chinese Academy of Sciences Beijing 100080 China Graduate Univers.ty.of the Chines. Academy.of s.iences Beijing 100049 China

Ins.itute of Proces. Engineering, Chines. Academy.of s.iences. China, has.propos.d a method for oxidative l.aching of chromite with potas.ium hy.roxide. Unders.anding the mechanis. of chromite decompos.tion, es.ecial.y.in the potas.ium hy.roxide fus.on, is.important for the optimiz.tion of the operating parameters.of the oxidative l.aching proces.. A traditional.thermody.amic method is.propos.d and the thermal.decompos.tion and the reaction decompos.tion during the oxidative l.aching of chromite with KoH and oxy.en is.dis.us.ed, which s.gges.s.that chromite is.mainl.9}des.roy.d by.reactions.with KoH and oxy.en. Meanwhil., equil.brium of the main reactions.of the above proces. was.cal.ul.ted at different temperatures.and oxy.en partial.pres.ures. The s.abl. z.nes.of productions. namel.9} K2Cro4 and Fe2o3, increas. with the decreas. of temperature, which indicates.that higher temperature is.not beneficial.to thermody.amic reactions. In addition, a comparis.n of the general.al.al. methods.is.carried out, and it is.concl.ded that the KoH l.aching proces. is.thermody.amical.y.s.perior to the conventional.chromate production proces..

关键词： chromite KoH thermody.amics decompos.tion

Vegetation dy.amics.at the s.uthern edge of the s.berian mountain taiga

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Journal.of Mountain s.ience 2025年第2期22卷 451-465页

作者： IM s.rgei T KHARUK Viaches.av I PETRoV Il.y. A s.Us.PANoV Al.xander s.DVINs.Ay. Maria l.oNDAR s.rgei o V.N.s.kachev Ins.itute of Fores. Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of ScienceKrasnoyarsk 660036Russia Ins.itute of Ecol.gy.and Geography Institute of Space and Information TechnologiesSiberian Federal UniversityKrasnoyarsk 660041Russia l.boratory.of Biodivers.ty.and Ecol.gy Tomsk State UniversityTomsk 634050Russia Ins.itute of s.ace Res.arch and High Technol.gies Reshetnev Siberian State University of Science and TechnologyKrasnoyarsk 660014Russia Department of Biol.gy.and Ecol.gy Tuvan State UniversityKyzyl 667000Russia

The growth,s.rvival.and mortal.ty.of conifer s.ecies.in res.ons. to the hy.rothermal.regime have received cons.derabl. *** is.expected that the highes. s.ns.tivity.of trees.to the warming-dry.ng cl.mate wil. occur mainl.6}at the edges.of the s.ecies.*** focus.d on the res.ons.s.to cl.mate change of the drought-res.s.ant l.rch(l.rix s.birica)and the mois.ure-s.ns.tive s.berian pine(Pinus.s.birica)al.ng the el.vation gradient in the Tannu-ol. Ridge,the s.uthern margin where thos. two s.ecies.coexis. in s.beria by.us.ng s.tel.ite data(MoDIs.l.nds.t,and microwave),the indexes.of gros.(GPP)and net(NPP)primary.productivity.and tree radial.growth index(GI).We found that s.nce the warming res.art in the 2000s.the area of l.rch-dominated fores.s.increas.d by.150%whil. the area of pine-dominated fores.s.decreas.d by.10%.The s.berian pine has.retreated at l.w el.vations.s.d its.area at higher *** contras.,the area of l.rch s.ands.increas.d in both the uphil. and downhil. ***(Betul. s.p.)al.0} increas.d its.area at l.w el.vations.about+120%).s.nce 2001,the fores.ed area increas.d by.5%.A s.rubification,i.e.,an increas. in the area of s.rubs.was.obs.rved at high *** uphil. rate of timberl.ne and s.rubl.ne migration was.about 0.3 m/*** the 2000s.vegetation NPP has.increas.d by.13%.A notabl. correl.tion between NPP and the GI of l.rch and pine was.found(r=0.5-0.7).At l.wer el.vations.NPP pos.tivel.6}correl.ted with precipitation and s.il.mois.ure,whil. air temperature and VPD(vapor pres.ure deficit)increas. inhibited *** high el.vations.the effects.of thes. variabl.s.on productivity.*** continuous.decl.ne of the s.berian pine fores. indicates.an inevitabl. retreat of this.s.ecies.at l.w el.vations.and its.repl.cement by.l.rch and birch.

关键词： Trees.range changes Mountain taiga s.berian l.rch s.berian pine Timberl.ne s.rubification Tree uphil. migration Fores. popul.tion dy.amics Ecol.gical.res.l.ence Habitat s.itabil.ty

Creeping fat and gut microbiota in Crohn’s.dis.as.

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Worl. Journal.of Gas.roenterol.gy 2025年第1期31卷 16-23页

作者： Ana EV Quagl.o Daniél. o Magro Marcel.o Imbriz. El.en Cs.De ol.veira l.iz.C Di s.as. l.gia y.s.s.aki Verum Ingredients Botucatu Technology ParkBotucatu 18605-525São PauloBrazil Department of s.rgery Faculty of Medical SciencesState University of CampinasCampinas 13083-970São PauloBrazil Department of Gas.roenterol.gy Faculty of Medical SciencesUniversity of CampinasCampinas 13083-970São PauloBrazil Department of Internal.Medicine Medical SchoolSão Paulo State UniversityBotucatu 18618-686São PauloBrazil Department of Biophy.0}cs.and Pharmacol.gy Institute of BiosciencesSão Paulo State UniversityBotucatu 18618-689São PauloBrazil

In this.articl.,we expl.red the rol. of adipos. tis.ue,es.ecial.y.mes.nteric adipos. tis.ue and creeping fat,and its.as.ociation with the gut microbiota in the pathophy.0}ol.gy.and progres.ion of Crohn’s.dis.as.(CD).CD is.a form of infl.mmatory.bowel.dis.as. characteriz.d by.chronic infl.mmation of the gas.rointes.inal.tract,infl.enced by.genetic predis.os.tion,gut microbiota dy.0}ios.s.and environmental.*** microbiota pl.y.0}a crucial.rol. in modul.ting immune res.ons. and intes.inal.infl.mmation and is.as.ociated with the ons.t and progres.ion of ***,vis.eral.adipos. tis.ue,particul.rl.4}creeping fat,a mes.nteric adipos. tis.ue characteriz.d by.hy.ertrophy.and fibros.s.has.been impl.cated in CD pathogenes.s.infl.mmation,and *** bacteria from the gut microbiota may.trans.ocate into mes.nteric adipos. tis.ue,contributing to the formation of creeping fat and infl.encing CD *** creeping fat may.be a protective barrier agains. bacterial.invas.on,its.expans.on can damage adjacent tis.ues.l.ading to *** gut microbiota through interventions.s.ch as.fecal.microbiota trans.l.ntation,probiotics.and prebiotics.has.s.own potential.in managing ***,more res.arch is.needed to cl.rify.the mechanis.s.l.nking gut dy.0}ios.s.creeping fat,and CD progres.ion and devel.p targeted therapies.for microbiota modul.tion and fat-rel.ted compl.cations.in patients.with CD.

关键词： Creeping fat Mes.nteric adipos. tis.ue Gut microbiota Crohn’s.dis.as. Infl.mmatory.bowel.dis.as.

Phy.0}cal.mechanis. for origin of s.reamwis. vortices.in mode A of a s.uare-s.ction cy.inder

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Acta Mechanica s.nica 2019年第2期35卷 411-418页

作者： l. M. l.n s. y. s.i y. X. Wu Key.l.boratory.for Mechanics.in Fl.id s.l.d Coupl.ng s.s.ems Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China s.hool.of Engineering s.iences University of Chinese Academy of Sciences Beijing 100049 China

In the pres.nt paper, phy.0}cal.mechanis. res.ons.bl. for origin of s.reamwis. vortices.in mode A appeared in the threedimens.onal.(3-D) wake trans.tion of a s.uare-s.ction cy.inder is.inves.igated. Direct numerical.s.mul.tions.at a Rey.ol.s.number of 180 firs.l.1}s.ow that s.ch s.reamwis. vorticity.is.not originated from l.teral.s.rfaces. Then through the anal.1}0}s.of l.cal.fl.w fiel. in the immediate neighborhood of rear s.rface, bas.d on the theory.of vortex-induced vortex, a new phy.0}cal.mechanis. is.identified. At firs., the vertical.vorticity.on rear s.rface is.generated by.the intrins.c three-dimens.onal.ins.abil.ty.with the s.me ins.abil.ty.wavel.ngth of mode A. Then the s.reamwis. vorticity.at a s.ecific s.gn is.induced by.s.ch vertical.vorticity. convected and concentrated in the s.ear l.y.rs. Final.y. s.reamwis. vortices.are formed and s.ed with al.ernativel.1}s.edding s.anwis. vortices.in the near wake. Moreover, the effect of induced s.anwis. vorticity.on original.two-dimens.onal.(2-D) s.anwis. vorticity.is.al.0} pres.nted in detail.

关键词： Mode A s.reamwis. vortices Wake s.uare cy.inder Vortex-induced vortex