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Long time exis.ence of Ricci-harmonic flow

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Frontiers.of Mathematics.in China 2016年第5期11卷 1313-1334页

作者： yi LI Department of Mathematics Shanghai Jiao Tong University Shanghai 200240 China

We give a s.rvey about recent res.lts.on Ricci-harmonic flow.

关键词： Ricci-harmonic flow (RHF) curvature pinching es.imates bound eds.alar curvature

Chaos.in Compact Binaries.with Frequency Map Analys.s

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Chines. Journal of As.ronomy and As.rophys.cs 2006年第6期6卷 705-715页

作者： yi Xie Tian-yi Huang Department of As.ronomy Nanjing University Nanjing 210093

The dynamics.of compact binaries.is.very complicated becaus. of s.in-orbit cou- pling and s.in-s.in coupling. With Las.ar＇s.frequency map analys.s.（FMA） and frequency diffus.on as.an indicator, we found that mis.lignment of the s.ins.and orbital angular momentum has.a great effect on the dynamics. and for s.s.ems.with different mas. ratios.β = m2/ml chaos.occurs.at different s.in-orbit configurations. For equal-mas. binaries.（β = 1）, chaos.occurs.when the s.ins.nearly cancel each other out. For s.me other s.s.ems.（for exampleβ - 1/2）, the binaries.are irregular, even chaotic, when the s.ins.are perpendicular to the orbital angular momentum. For the cas. where gravitational radiation is.taken into account, we give an analytic es.imation for the frequency diffus.on bas.d on the decay of the orbit, which is.roughly cons.s.ent with our s.mulations. This.means.the FMA is.not s.itable as.a chaos.indicator for weak chaotic cas.s.with dis.ipative terms.

关键词： celes.ial mechanics.- (s.ars.) binaries.(including multiple) clos.

Recent advances.in the identification of the hos. factors.involved in dengue virus.replication

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Virologica s.nica 2017年第1期32卷 23-31页

作者： yi Wang Department of Immunology Institute of Human Virology Zhongshan School of Medicine Sun Yat-sen University Guangzhou 510080 China Key Laboratory of Tropical Dis.as.s.Control (s.n Yat-s.n Univers.ty) Ministry of EducationGuangzhou 510080 China

Dengue virus.DENV) belongs.to the genus.Flavivirus.of the family Flaviviridae and it is.primarily trans.itted via Aedes.aegypti and Aedes.albopictus.mos.uitoes. The life cycle of DENV includes.attachment, endocytos.s. protein trans.ation, RNA s.nthes.s. as.embly, egres., and *** res.arches.have indicated that a variety of hos. factors. including cellular proteins.and micro RNAs. pos.tively or negatively regulate the DENV replication proces.. This.review s.mmarizes.the lates. findings.from 2014 to 2016) in the identification of the hos. factors.involved in the DENV life cycle and Dengue infection.

关键词： dengue virus.(DENV) hos. factors replication proteins miRNAs

The Univers.l Kolyvagin Recurs.on Implies.the Kolyvagin Recurs.on

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Acta Mathematica s.nica,Englis. s.ries 2007年第7期23卷 1163-1172页

作者： yi OUYANG Department of Mathematical s.iences Tsinghua University

Let Hz. be the univers.l norm dis.ribution and M a fixed power of prime p. By us.ng the double complex method employed by Anders.n, we s.udy the univers.l Kolyvagin recurs.on occurring in the canonical bas.s.in the cohomology group H^0（Gz,Hz/MHz）. We furthermore s.ow that the univers.l Kolyvagin recurs.on implies.the Kolyvagin recurs.on in the theory of Euler s.s.ems. One certainly hopes.this.could lead to a new way to find new Euler s.s.ems.

关键词： Euler s.s.em univers.l dis.ribution Kolyvagin recurs.on

Buchs.aber Invariants.of Univers.l Complexes

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Chines. Annals.of Mathematics.s.ries.B 2017年第6期38卷 1335-1344页

作者： yi s.N s.hool of Mathematical s.iences Fudan UniversityShanghai 200433China.

Davis.and Janus.kiewicz introduced(real and complex) univers.l complexes.to give an equivalent definition of characteris.ic maps.of s.mple polytopes. which now can be s.en as."colorings.. The author derives.an equivalent definition of Buchs.aber invariants.of a s.mplicial complex K, then interprets.the difference of the real and complex Buchs.aber invariants.of K as.the obs.ruction to liftings.of nondegenerate s.mplicial maps.from K to the real univers.l complex or the complex univers.l complex. It was.proved by Ayzenberg that real univers.l complexes.can not be nondegenerately mapped into complex univers.l complexes.when dimens.on is.3. This.paper pres.nts.that there is.a nondegenerate map from 3-dimens.onal real univers.l complex to 4-dimens.onal complex univers.l complex.

关键词： Buchs.aber invariant Univers.l complex Lifting problem

The J-flow on Toric Manifolds

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Acta Mathematica s.nica,Englis. s.ries 2015年第10期31卷 1582-1592页

作者： yi YAO Department of Mathematics Nanjing University

We s.udy the long time behavior of J-flows.on toric manifolds. By introducing the tran- s.tion maps.between moment maps. we get a quas.linear parabolic s.s.em for J-flows. s.me bas.c es.imates.for trans.tion maps.are ... 详细信息

关键词： J-flow toric manifold moment map degenerate parabolic s.s.em

Meas.ring the orbital periods.of low mas. X-ray binaries.in the X-ray band

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Res.arch in As.ronomy and As.rophys.cs 2014年第11期14卷 1367-1382页

作者： yi Chou Graduate Ins.itute of As.ronomy National Central University

A low mas. X-ray binary （LMXB） contains.either a neutron s.ar or a black hole accreting materials.from its.low mas. companion s.ar. It is.one of the primary as.rophys.cal s.urces.for s.udying s.ellar-mas. compact objects.and accreting phe- nomena. As.with other binary s.s.ems. the mos. important parameter of an LMXB is.the orbital period, which allows.us.to learn about the nature of the binary s.s.em and cons.rain the properties.of the s.s.em＇s.components. including the compact ob- ject. As.a res.lt, meas.ring the orbital periods.of LMXBs.is.es.ential for inves.igating thes. s.s.ems.even though fewer than half of them have known orbital periods. This.article introduces.the different methods.for meas.ring the orbital periods.in the X-ray band and reviews.their application to various.types.of LMXBs. s.ch as.eclips.ng and dipping s.urces. as.well as.puls.r LMXBs.

关键词： X-rays. binaries.-- binaries. clos. -- methods. data analys.s

Numerical s.mulation of Coal Deformation and Gas.Flow Properties.Around Borehole

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Computer Modeling in Engineering & s.iences 2017年第4期113卷 429-441页

作者： yi Xue s.ate Key Laboratory Bas. of Eco-Hydraulic Engineering in Arid Areas Xi’an University of TechnologyXi’an 710048China Ins.itute of Geotechnical Engineering Shaanxi Provincial Key Laboratory of Loess Mechanics and EngineeringXi’an University of TechnologyXi’an 710048China

The lack of res.arch on the effect of diffus.on on methane extraction leads.to low methane concentration and low *** Coms.l Multiphys.cs.s.ftware is.us.d to s.lve the numerical gas.and s.lid coupled model which cons.ders.the diffus.on of coal matrix,fracture s.epage,permeability evolution and coal *** s.mulation res.lts.reveal the effect of diffus.on proces. on methane *** gas.diffus.on rate is.relatively high in the initial *** the increas. in time,the difference between coal fractures.and coal matrix blocks.becomes.lower and the gas.diffus.on rate decreas.s.*** gas.s.epage rate decreas.s.s.gnificantly near the borehole and the decreas. degree becomes.s.all when it is.far away from *** influence of diffus.on time on gas.drainage rate is.not obvious.

关键词： Temperature permeability poros.ty gas pres.ure heat injection

Bainite is.thermal trans.ormation of s.–Mn–Mo alloy by phas. s.ructure factor calculation under different rare earth contents

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Rare Metals 2014年第4期33卷 427-432页

作者： Yan-Liang yi yi-Long Liang Qi-Bing Tan The Key Laboratory for Mechanical Behavior and Micros.ructure of Materials School of Materials and MetallurgyGuizhou University

The effect of rare earth （RE） on bainite trans. formation mechanis. is.not yet unified in the academia. Therefore, further s.udying the effect of RE on bainite trans.ormation mechanis. will have important guiding s.gnificance for the development of bainite s.eels. In this.paper, us.ng differential dilatometer （DIL805A/D）, heat treatment was.performed and C-curve was.drawn. The effect of phas. s.ructure factor on bainite trans.ormation under two different fractions.of RE in s.-Mn-Mo bainite s.eels.was.inves.igated by the empirical electron theory （EET） of s.lids. molecules. dilatometry, and metallogra- phy. Experimental res.lts.s.ow that RE makes.Fe-C- RE s.gregation s.ructural unit of s.-Mn-Mo bainite s.eels.increas., i.e., the values.of phas. s.ructure factor （na, FDC） increas., and delay bainite trans.ormation due to the drag effect res.lting from the s.gregation of RE ferrite is.and interphas. and the retardation of RE to carbon diffus.on in s.-Mn-Mo bainite s.eels. Bes.de this. C-curve is.s.ifted to right and down, and micros.ructures.of bainite ferrite and s.bs.ructures.are finer.

关键词： Phas. s.ructure factor C-curve s.bs.ructure Rare earths