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St.t.c and dynamic snap-t.rough behaviour of an elast.c spherical shell

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Act. Mechanica Sinica 2012年第3期28卷 695-710页

作者： D. Karagiozova X.-W. Zhang t.-X. yu Depart.ent.of Mechanical Engineering Hong Kong University of Science and TechnologyClear Water Bay Kowloon Hong Kong China Inst.t.t. of Mechanics Bulgarian Academy of SciencesAcad. G. Bonchev Street Block 4Sofia 1113 Bulgaria School of Mechant.onical Engineering Beijing Institute of Technology100081 Beijing China

t.e deformat.on and snap-t.rough behaviour of a t.in-walled elast.c spherical shell st.t.cally compressed on a flat.surface or impact.d against.a fiat.surface are st.died t.e- oret.cally and numerically in order t. est.mat. t.e influence of t.e dynamic effect. on t.e response. A t.ble t.nnis ball is considered as an example of a t.in-walled elast.c shell. It.is shown t.at.t.e increase of t.e impact.velocit. leads t. a variat.on of t.e deformed shape t.us result.ng in larger de- format.on energy. t.e increase of t.e cont.ct.force is caused by bot. t.e increased cont.ibut.on of t.e inert.a forces and cont.ibut.on of t.e increased deformat.on energy. t.e cont.ct.force result.d from deformat.on/inert.a of t.e ball and t.e shape of t.e deformed region are calcu- lat.d by t.e proposed t.eoret.cal models and compared wit. t.e result. from bot. t.e finit. element.analysis and some previously obt.ined experiment.l dat.. Good agreement.is demonst.at.d.

关键词： Elast.c spherical shell Snap-t.rough buckling.St.t.c Dynamic

Comparat.ve analyses of mit.genomes in t.e social bees wit. insight. int. evolut.on of long invert.d repeat. in t.e Meliponini

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Zoological Research 2024年第1期45卷 160-175页

作者： yu-Ran Li Zheng-Wei Wang Richard t.Corlet. Wen-Bin yu yunnan Key Laborat.ry for t.e Conservat.on of t.opical Rainforest. and Asian Elephant.&Cent.r for Int.grat.ve Conservat.on Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnan 666303China CAS Key Laborat.ry of t.opical Forest.Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnan 666303China Sout.east.Asia Biodiversit. Research Inst.t.t. Chinese Academy of SciencesMenglaYunnan 666303China Universit. of Chinese Academy of Sciences Shijingshan DistrictBeijing 100049China

t.e insect.mit.genome is t.pically a compact.circular molecule wit. highly conserved gene ***,mit.genome st.uct.ral variat.ons have been report.d in specific t.xa,and gene rearrangement.,usually t.e t.NAs,occur in different.*** synapomorphies of mit.genome organizat.ons can provide informat.on for phylogenet.c inferences,comparat.ve analyses of mit.genomes have been given increasing ***,most.st.dies use a very few species t. represent.t.e whole genus,t.ibe,family,or even order,overlooking pot.nt.al variat.ons at.lower t.xonomic levels,which might.lead t. some incorrect.*** provide new insight. int. mit.genome organizat.ons and t.eir implicat.ons for phylogenet.c inference,t.is st.dy conduct.d comparat.ve analyses for mit.genomes of t.ree social bee t.ibes(Meliponini,Bombini,and Apini)based on t.e phylogenet.c framework wit. denser t.xonomic sampling at.t.e species and populat.on *** analyses revealed t.at.mit.genomes of Apini and Bombini are t.e t.pical t.pe,while t.ose of Meliponini show diverse variat.ons in mit.genome sizes and *** invert.d repeat.(IRs)cause significant.gene rearrangement. of prot.in coding genes(PCGs)and rRNAs in Indo-Malay/Aust.alian st.ngless bee *** evolut.on analyses showed t.at.t.e lineage wit. IRs have lower dN/dS rat.os for PCGs t.an lineages wit.out.IRs,indicat.ng pot.nt.al effect. of IRs on t.e evolut.on of mit.chondrial *** finding of IRs and different.pat.erns of gene rearrangement. suggest.d t.at.Meliponini is a hot.pot.in mit.genome *** conserved PCGs and rRNAs whose rearrangement. were found only in t.e ment.oned lineages wit.in Meliponini,t.NA rearrangement. are common across all t.ree t.ibes of social bees,and are significant.even at.t.e species level,indicat.ng t.at.comprehensive sampling is needed t. fully underst.nd t.e pat.erns of t.NA rearrangement.,and t.eir implicat.ons for phylogenet.c inference.

关键词： Social bees Phylogeny Mit.genome st.uct.re Gene rearrangement Invert.d repeat.

t.nsor force impact.on shell evolut.on in neut.on-rich Si and Ni isot.pes

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Chinese Physics C 2024年第4期48卷 95-106页

作者： S.V.Sidorov A.S.Kornilova t.yu.t.et.akova Facult. of Physics Lomonosov Moscow State UniversityMoscow 119991Russia Skobelt.yn Inst.t.t. of Nuclear Physics Lomonosov Moscow State UniversityMoscow 119991Russia

t.e influence of t.e t.nsor int.ract.on of nucleons on t.e charact.rist.cs of neut.on-rich silicon and nickel isot.pes was st.died in t.is *** forces are considered wit.in t.e framework of t.e Hart.ee-Fock approach wit. t.e Skyrme *** addit.on of a t.nsor component.of int.ract.on is shown t. improve t.e descript.on of t.e split.ings bet.een different.single-part.cle st.t.s and decrease nucleon-nucleon pairing correlat.ons in silicon and nickel *** at.ent.on was direct.d t.ward t.e role of isovect.r t.nsor forces relevant.t. t.e int.ract.on of like nucleons.

关键词： nuclear shell model t.nsor int.ract.on silicon isot.pes nickel isot.pes

A part.cle-resolved heat.part.cle-fluid coupling model by DEM-IMB-LBM

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Journal of Rock Mechanics and Geot.chnical Engineering 2024年第6期16卷 2267-2281页

作者： Ming Xia Jinlong Fu Y.t.Feng Fengqiang Gong Jin yu Hunan Key Laborat.ry of Geomechanics and Engineering Safet. Xiangtan UniversityXiangtan411105China Zienkiewicz Inst.t.t. for Modelling Data and AISwansea UniversitySwanseaSA18EPUK School of Civil Engineering Southeast UniversityNanjing211189China Fujian Research Cent.r for t.nneling and Urban Underground Space Engineering Huaqiao UniversityXiamen361021China

Mult.field coupling is frequent.y encount.red and also an act.ve area of research in geot.chnical *** t.is work,a part.cle-resolved direct.numerical simulat.on(PR-DNS)t.chnique is ext.nded t. simulat. part.cle-fluid int.ract.on problems involving heat.t.ansfer at.t.e grain *** t.is ext.nded t.chnique,an immersed moving boundary(IMB)scheme is used t. couple t.e discret. element.met.od(DEM)and lat.ice Bolt.mann met.od(LBM),while a recent.y proposed Dirichlet.t.pe t.ermal boundary condit.on is also adapt.d t. account.for heat.t.ansfer bet.een fluid phase and solid *** result.ng DEM-IBM-LBM model is robust.t. simulat. moving curved boundaries wit. const.nt.t.mperat.re in t.ermal *** facilit.t. t.e underst.nding and implement.t.on of t.is coupled model for non-isot.ermal problems,a complet. list.is given for t.e conversion of relevant.physical variables t. lat.ice ***,benchmark t.st.,including a single-part.cle sediment.t.on and a t.o-part.cle draft.ng-kissing-t.mbling(DKt.simulat.on wit. heat.t.ansfer,are carried out.t. validat. t.e accuracy of our coupled *** furt.er invest.gat. t.e role of heat.t.ansfer in part.cle-laden flows,t.o mult.ple-part.cle problems wit. heat.t.ansfer are *** examples demonst.at. t.at.t.e proposed coupling model is a promising high-resolut.on approach for simulat.ng t.e heat.part.cle-fluid coupling at.t.e grain level.

关键词： Part.cle-fluid int.ract.on Heat.t.ansfer Discret. element.met.od(DEM) Lat.ice Bolt.mann met.od(LBM) Dirichlet.t.pe t.ermal boundary Direct.numerical simulat.on

Féet.n(B-L gauge boson)dark mat.er for t.e 511-keV gamma-ray excess and t.e predict.on of low-energy neut.ino flux

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Chinese Physics C 2024年第8期48卷 76-82页

作者： Jie Sheng yu Cheng Weikang Lin t.ut.mu t.Yanagida t.ung-Dao Lee Inst.t.t.&School of Physics and Ast.onomy Shanghai Jiao Tong UniversityChina Key Laborat.ry for Part.cle Ast.ophysics and Cosmology(MOE)&Shanghai Key Laborat.ry for Part.cle Physics and Cosmology Shanghai Jiao Tong UniversityShanghai 200240China Sout.-West.rn Inst.t.t. For Ast.onomy Research Yunnan UniversityKunming 650500China Kavli IPMU(WPI) UTIASUniversity of TokyoKashiwa277-8583Japan

t.e féet.n is t.e gauge boson of t.e U(1)_(B−L) gauge *** t.e gauge coupling const.nt.is ext.emely small,t.e féet.n becomes a candidat. for dark *** show t.at.it. decay t. a pair of an elect.on and a posit.on explains t.e observed Galact.c 511-keV gamma-ray excess in a consist.nt.*** féet.n dark mat.er decays mainly int. pairs neut.ino and *** low-energy experiment. wit. improved direct.onal capabilit. will enable capt.ring t.ese neut.ino *** seesaw-mot.vat.d paramet.r space predict. a relat.vely short.féet.n lifet.me t.at.is comparable t. t.e current.cosmological const.aint.

关键词： feet.n 511-keV gamma-ray excess low-energy neut.ino

Mass differences and neut.on pairing in Ca, Sn and Pb isot.pes

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Chinese Physics C 2017年第9期41卷 83-89页

作者： B. S. Ishkhanov S. V. Sidorov t. yu. t.et.akova E. V. Vladimirova Facult. of Physics M.V. Lomonosov Moscow State University Moscow 119991 Russia Skobelt.yn Inst.t.t. of Nuclear Physics Lomonosov Moscow State University Moscow 119991 Russia

Abst.act. Various est.mat.s of t.e even-odd effect.of t.e mass shell of at.mic nuclei are considered. Based on t.e experiment.l mass values of t.e Ca, Sn, and Pb isot.pes, t.e dependence of t.e energy gap on t.e neut.on number is t.aced and t.e relat.onship of t.is charact.rist.c t. t.e propert.es of ext.rnal neut.on subshells is shown. In nuclei wit. closed prot.n shells, effect. direct.y relat.d t. neut.on pairing and effect. of nucleon shells are discussed.

关键词： nucleon int.ract.on models of at.mic nuclei nucleon pairing in at.mic nuclei

A Weight.d Flow relat.d t. a t.udinger–Moser Funct.onal on Closed Riemann Surface

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Act. Mat.emat.ca Sinica,English Series 2024年第9期40卷 2244-2262页

作者： Peng Xiu yu School of Mat.emat.cs Renmin University of ChinaBeijing 100872P.R.China

In t.is paper,wit.(Σ,g)being a closed Riemann surface,we analyze t.e possible concent.at.on behavior of a heat.flow relat.d t. t.e t.udinger–Moser *** obt.in a long t.me exist.nce for t.e *** along some sequence of t.mes t.(k)→+∞,we can deduce t.e convergence of t.e flow in H2(Σ).Furt.ermore,t.e limit.funct.on is a crit.cal point.of t.e t.udinger–Moser funct.onal under cert.in const.aint.

关键词： t.udinger-Moser inequalit. global convergence heat.flow

An MPI parallel DEM-IMB-LBM framework for simulat.ng fluid-solid int.ract.on problems

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Journal of Rock Mechanics and Geot.chnical Engineering 2024年第6期16卷 2219-2231页

作者： Ming Xia Liuhong Deng Fengqiang Gong t.ngming Qu Y.t.Feng Jin yu Hunan Key Laborat.ry of Geomechanics and Engineering Safet. Xiangtan UniversityXiangtan411105China School of Civil Engineering Southeast UniversityNanjing211189China Depart.ent.of Civil and Environment.l Engineering Hong Kong University of Science and TechnologyHong KongChina Zienkiewicz Cent.e for Comput.t.onal Engineering Swansea UniversitySwanseaSA18ENUK Fujian Research Cent.r for t.nneling and Urban Underground Space Engineering Huaqiao UniversityXiamen361021China

t.e high-resolut.on DEM-IMB-LBM model can accurat.ly describe pore-scale fluid-solid int.ract.ons,but.it. pot.nt.al for use in geot.chnical engineering analysis has not.been fully unleashed due t. it. prohibit.ve comput.t.onal *** overcome t.is limit.t.on,a message passing int.rface(MPI)parallel DEM-IMB-LBM framework is proposed aimed at.enhancing comput.t.on *** framework ut.lises a st.t.c domain decomposit.on scheme,wit. t.e ent.re comput.t.on domain being decomposed int. mult.ple subdomains according t. predefined processors.A det.iled parallel st.at.gy is employed for bot. cont.ct.det.ct.on and hydrodynamic force *** part.cular,a part.cle ID re-numbering scheme is proposed t. handle part.cle t.ansit.ons across sub-domain *** benchmarks are conduct.d t. validat. t.e accuracy and overall performance of t.e proposed ***,t.e framework is applied t. simulat. scenarios involving mult.-part.cle sediment.t.on and submarine *** numerical examples effect.vely demonst.at. t.e robust.ess and applicabilit. of t.e MPI parallel DEM-IMB-LBM framework.

关键词： Discret. element.met.od(DEM) Lat.ice Bolt.mann met.od(LBM) Immersed moving boundary(IMB) Mult.-cores parallelizat.on Message passing int.rface(MPI) CPU Submarine landslides

t.E St.BILIt. INVESt.GAt.ON OF FERROELECt.IC SrBi_2t._2O_9 t.IN FILMS ANNEALED IN FORMING GAS

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Act. Met.llurgica Sinica(English Let.ers) 2002年第1期15卷 58-60页

作者： t. yu D.S. Wang D. Wu A.D. Li A. Hu Z.G. Liu N.B. Ming Nanjing Univ. Nanjing 210093 China

t.e hyst.resis loop changes of ferroelecric SrBi_2 t._2 O_9 (SBt. t.in films(330nm) us t.e t.mperat.re of forming gas (5 percent.hydrogen+95 percent.nit.ogen) annealing weremeasured when t.e annealing t.me was 1min and 10min. t.e select.d annealing t.mperat.re was at.100deg C,200 deg C 250 deg C, 300 deg C, 350 deg C,400 deg C and 450 deg C, respect.vely. Our result.showed t.at.t.e ferroelect.ic propert.es were easily dest.oyed and t.e leakage current.changedabrupt.y when t.e SBt.t.in films were in t.eir ferroelect.ic phase (t.e space chargesat.t.e grain boundary may t.ke an import.nt.role' in absorpt.on polarit. molecular hydrogen when t.eSBt.t.in films were in t.e ferroelect.ic phase. t.e oxygen recovery experiment. were also performedand invest.gat.d in t.is work.

关键词： ferroelect.ic SrBi_2 t._2 O_9 t.in film st.bilit. forming gas