检索结果-南通市图书馆

Block-Tr.nsitive 2.(v,k,1) Designs and Gr.up. E_6(q)

在线全文

学校读者我要写书评

暂无评论

Jour.al of Mathematical r.sear.h and Exp.sition 2010年第4期30卷 581-588页

作者： Guang Guo HAN1,2.1. Institute of mathematics, Hangzhou Dianzi univ.r.ity, Zhejiang 3.0018,{2. 2. Institute of infor.ation Engineer.ng, infor.ation Engineer.ng univ.r.ity, Henan 450002.{2. Institute of mathematics Hangzhou Dianzi University 310018

This ar.icle is a contr.bution to the study of block-tr.nsitive automor.0}ism gr.up. of 2.（v,k,1） block designs. Let D be a 2.（v,k,1） design admitting a block-tr.nsitive, p.intp.imitive but not flag-tr.nsitive automor.0}ism gr.up.G. Let kr.= （k,v-1） and q = p. for.p.ime p. In this p.p.r.we p.ove that if G and D ar. as above and q （3.kr.-kr.＋ 1）f）1/3. then G does not admit a simp.e gr.up.E6（q） as its socle.

关键词： block design block-tr.nsitive p.int-p.imitive automor.0}ism gr.up.

Mor. on Bounding Intr.sp.ction in Modal Nonmonotonic Logics

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Ser.es 2000年第4期16卷 555-564页

作者： Xishun Zhao Decheng Ding Dep.r.ment of mathematics. Nanjing univ.r.ity. Nanjing 2.0093.{2. Dep.r.ment of mathematics Nanjing University Nanjing 210093 P. R. China

By L. we denote the set of all p.op.sitional for.mlas. Let C be the set of all clauses. Define C_n=C(Lη:η∈C}.In Sec. 2.of this p.p.r. we p.ove that for.nor.al modal logics S, the notions of (S. C_)-exp.nsions and S-exp.nsions coincide. In Sec. 3. we p.ove that if I consists of default clauses then the notions of S-exp.nsions for.I and (S.C)-exp.nsions for.I coincide. To this end. we fir.t show. in Sec *** the notion of S-exp.nsions for.I is the same as that of (S.L)-exp.nsions for.I.

关键词： Modal nonmonotonic logic Exp.nsion Bounding Intr.sp.ction Default clause

New Families in the Stable Homotop. of Sp.er.s r.visited

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Ser.es 2002年第1期18卷 95-106页

作者： LIN Jin Kun Dep.r.ment of mathematics. Nankai univ.r.ity. Tianjin 3.0071.{2. Dep.r.ment of mathematics Nankai University Tianjin P. R. China

This p.p.r.constr.cts a new family in the stable homotop. of sp.er.s π_(t-)S r.p.esented by h_ngoY_3.∈E_2.6(,t) in the Adams sp.tr.l sequence which r.visits the b_(n-1goY3.-elements ∈π_(-7)S con- str.ctced in[3.. ... 详细信息

关键词： Stable homotop. of sp.er.s Adams sp.ctr.l sequence Toda-Smith sp.ctr.m Adams r.solution

Asymp.otic Behavior.of Global Classical Solutions to the Cauchy p.oblem on a Semi-Bounded Initial Axis for.Quasilinear.Hyp.r.olic Systems

在线全文

学校读者我要写书评

暂无评论

Jour.al of Mathematical r.sear.h and Exp.sition 2010年第1期30卷 41-53页

作者： Wei Wei HAN1,2.1. Dep.r.ment of Ap.lied mathematics, Donghua univ.r.ity, Shanghai 2.162.,{2. 2. School of Mathematical Sciences, Fudan univ.r.ity, Shanghai 2.043.,{2. Dep.r.ment of Ap.lied mathematics Donghua University ShanghaiR.R.China 201620

In this p.p.r.we study the asymp.otic behavior.of global classical solutions to the Cauchy p.oblem with initial data given on a semi-bounded axis for.quasilinear.hyp.r.olic systems. Based on the existence r.sult on the global classical solution, we p.ove that, when t tends to the infinity, the solution ap.r.aches a combination of C1 tr.velling wave solutions with the algebr.ic r.te （1 ＋ t）^-u, p.ovided that the initial data decay with the r.te （1 ＋ x）^-（l＋u）（r.sp. （1 - x）^-（1＋u）） as x tends to ＋∞ （r.sp. -∞）, wher. u is a p.sitive constant.

关键词： quasilinear.hyp.r.olic system Cauchy p.oblem on a semi-bounded initial axis global classical solution weak linear.degener.cy matching condition tr.velling wave.

Existence and Multip.icity of p.r.odic Solutions of the Second-Or.er.Differ.ntial Equations with Jump.ng Nonlinear.ties

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Ser.es 2002年第3期18卷 615-624页

作者： Zai Hong WANG Dep.r.ment of mathematics, Cap.tal Nor.al univ.r.ity. Beijing 10003..{2. Dep.r.ment of mathematics Capital Normal University Beijing P. R. China

We p.ovide sufficient conditions for.the existence and multip.icity of p.r.odic solutions for.Duffing's equations with jump.ng nonlinear.ties under.r.sonance conditions.

关键词： p.r.odic solution Jump.ng nonlinear.ties Sp.ctr.m cur.e Time map

Comp.ete For.ulas for.the Volumes of Tubes about Cur.es in a r.emannian Manifold

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Ser.es 2001年第2期17卷 243-252页

作者： Fa En WU Dep.r.ment of mathematics. Nor.her. Jiaotong univ.r.ity. Beijing 100044,{2. Dep.r.ment of mathematics Northern Jiaotong University Beijing 100044 P. R. China

By using the Taylor.exp.nsions of the solutions of Jacobi equations, we obtain the comp.ete for.ulas for.the volumes of tubes about cur.es in a r.emanuian manifold. This unifies the known r.sults and simp.ifies the comp.tations involved in this dir.ction. In the sp.cial case of sur.aces, we also obtain the cor.esp.nding comp.ete for.ulas which gener.lize the known r.sults.

关键词： Fer.i coor.inates N-Jacobi field Taylor exp.nsion Volumes of tubes

The Existence of Entr.p. Solutions to Some p.r.bolic p.oblems with L^1 Data

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Ser.es 2002年第1期18卷 119-128页

作者： LI Feng Quan Dep.r.ment of mathematics. Qufu Nor.al univ.r.ity, Shandong 2.3.65.{2. Dep.r.ment of mathematics Qufu Normal University Shandon P. R. China

In this p.p.r. an existence r.sult of entr.p. solutions to some p.r.bolic p.oblems is established. The data belongs to L^1 and no gr.wth assump.ion is made on the lower.or.er.ter. in diver.6}nce for..

关键词： Existence p.r.bolic p.oblems Entr.p. solutions L^1 Data

LIL and the Ap.r.ximation of r.ctangular.Sums of B-valued r.ndom Var.ables when Extr.me Ter.s ar. Excluded

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Ser.es 2002年第3期18卷 605-614页

作者： Li Xin ZHANG Dep.r.ment of mathematics Xixi Camp.s. Zhejiang univ.r.ity, Hangzhou 3.002.,{2. Dep.r.ment of mathematics Xixi Camp.s Zhejiang University Hangzhou P. R. China

Let {X, X_; ∈N^d} be a field of i.i.d, r.ndom var.ables indexed by d-tup.es of p.sitive integer. and taking values in a Banach sp.ce B and let X_^((r.)=X_(m) if ‖X_‖ is the r.th maximum of {‖X_‖; ≤. Let S_=∑(≤)X_ and ^((r.)S_=S_-(X_^((1))+…+X_^((r.). We ap.r.ximate the tr.mmed sums ^((r.)_n, by a Br.wnian sheet and obtain sufficient and necessar. conditions for.^((r.)S_ to satisfy the comp.ct and functional laws of the iter.ted logar.thm. These r.sults imp.ove the p.evious wor.s by Mor.ow (1981), Li and Wu (1989) and Ledoux and Talagr.nd (1990).

关键词： Str.ng ap.r.ximation Tr.mmed sums The law of iter.ted logar.thm

The r.constr.ction and inter.0}etations of lake status at 6 ka and 18 ka *** inland mainland Asia

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第14期43卷 1145-1157页

作者： QIN Boqiang 1, SHI Yafeng 1 and YU ge 2. 3.1. Nanjing Institute of geogr.p.y & Limnology, Chinese Academy of Sciences, Nanjing 2.0008, china 2. Dynamic p.laeoclimatology, Lund univ.r.ity, p. Box 117, S 2.1 00, Lund, Sweden 3. Dep.r.ment of Nanjing Institute of geogr.p.y & Limnolagy Chinese Academy of Sciences Nanjing China Dynamic p.laeoclimatology Lund University Lund Sweden Dep.r.ment of geology and Ocean Sciences Nanjing University Nanjing China

By means of sur.ey of liter.tur. thr.ugh comp.lations of sedimentological, biogeological and geomor.0}ologic data, the inland lake level changes in ar.d or.semi ar.d mainland Asia at 6 and 18 ka B.p. have been r.constr.cted. The r.sults showed that the lakes fr.m wester. and nor.hwester. Asia wer. char.cter.zed by ver. high water.levels at 18 ka B.p., but low or.inter.ediate water.stands at 6 ka B.p. The high lake level in this r.gion was associated with the southwar. disp.acement of wester.ies, ther.for., the extent of the high lake stand indicated the souther. flank of wester.ies dur.ng the glaciation. Conver.ely, the lakes fr.m the easter. and souther. Asia r.gister.d comp.r.tive low levels at 18 ka B.p. and significantly high one at 6 ka B.p. The lower.ng of lake level at 18 ka B.p. was caused by the weakened summer.monsoon and the high lake level at 6 ka B.p. by the enhanced summer.monsoon induced by the enlar.2}d ther.al contr.st between land and ocean. The extent of high lake levels indicated the nor.her. boundar. of monsoon exp.nsion. Between the above two r.gions, ther. is a climatic tr.nsitional zone in the Centr.l Asia wher. the lake behavior.was close to that in southeaster. Asia at 6 ka B.p. but became similar.to that in nor.hwester. Asia at 18 ka B.p. Thus this zone became a tr.nsitional sector.fr.m the monsoon to the wester.ies.

关键词： lake status inland mainland Asia wester.ies monsoon.