检索结果-南通市图书馆

A THEOREM ON PLURICANONICAL MAPS OF NONSINGULAR MINIMAL THREEFOLDS OF GENERAL TYPE

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of mathematics,Series B 1998年第4期19卷 415-420页

作者： CHEN MENG (Department of mathematics, TOng n university, shanghai 200092, china.) tongji Univ Dept Math Shanghai 200092 Peoples R China

Let X be a complex nonsingular projective threefold of general type. It is shown that the dimension of the image of X through m-canonical maps is at least two for every m 3.

关键词： Minimal model Pluricanonical map Composed of a pencil

A multi-layer model for early diagenesis

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第16期42卷 1385-1387页

作者： MEI HongmingDepartment of Marine Geology, tongji university, shanghai 200092, china Department of Marine Geology Tongji University Shanghai China

EARLY diagenesis is defined here as a series of physical, chemical and biological reactions operating between depositional particles, porewaters and environmental water medium in the processes of deposition and shallow burial. Early diagenesis can produce geochemical succession within deposits, which can be divided from top to bottom into oxidation zone (OX), sulphate reduction zone (SR) and methanogenesis zone (ME). Part of the reaction

关键词： early diagenesis biogeochemical zone multi-layer model.

Nonlinear constitutive law for ferroelectric/ferroelastic material and its finite element realization

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2007年第1期50卷 70-86页

作者： LI YaoChen Department of Aerospace Engineering and Applied Mechanics,tongji university,shanghai 200092,china Department of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092 China

The hysteresis phenomena of ferroelectric/ferroelastic material in polarization procedure are investigated. Some assumptions are presented based on the published experimental data. The electrical yielding criterion, mechanical yielding criterion and isotropic hardening model are established. The flow theory in incremental forms in polarization procedure is presented. The nonlinear constitutive law for electrical-mechanical coupling is proposed phenomenologically. Finally, the nonlinear constitutive law expressed in a form of matrices and vectors, which is immediately associated with finite element analysis, is formulated. In the example problem of a rectangular specimen subjected to a uniaxial electric field, the procedure from virgin state to fully polarized state is simulated. Afterward, a uniaxial compressive loading is applied to depolarizing the specimen. Results are in agreement with the experimental data.

关键词： ferroelectric/ferroelastic material constitutive law nonlinear finite element method.

THE OCCUPATION DENSITY FIELD FOR THE CATALYTIC SUPER-BROWNIAN MOTION

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of mathematics,Series B 1999年第4期20卷 447-454页

作者： HONG WENMING(institute of mathematics, Fudan university shanghai 200433, china) Fudan Univ Inst Math Shanghai 200433 Peoples R China

It is proved that the occupation time of the catalytic super-Brownian motion is absolutely continuous for d = 1, and the occupation density field is jointly continuous and jointly Holder continuous.

关键词： Branching rate functional Brownian collision local time Catalytic super-Brownian motion Occupation time Occupation density field

Analytical solution for wave-induced response of isotropic poro-elastic seabed

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2010年第10期53卷 2619-2629页

作者： ZHANG YongLi & LI Jie Department of Building Engineering, tongji university, shanghai 200092, china 1. Department of Building Engineering Tongji University Shanghai 200092 China

By use of separation of variables,the governing equations describing the Biot consolidation model is firstly transformed into a complex coefficient linear homogeneous ordinary differential equation,and the general solution of the horizontal displacement of seabed is constructed by employing a complex wave number,thus,all the explicit analytical solutions of the Biot consolidation model are determined. By comparing with the experimental results and analytical solution of Yamamoto etc. and the analytical solution of Hsu and Jeng,the validity and superiority of the suggested solution are verified. After investigating the influence of seabed depth on the wave-induced response of isotropic poro-elastic seabed based on the present theory,it can be concluded that the influence depth of wave-induced hydrodynamic pressure in the seabed is equal to the wave length.

关键词： linear wave dynamic water pressure seabed analytical solution Biot consolidation model

Schwarz-Pick estimates for positive real part holomorphic functions on unit ball and polydisc

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2010年第4期53卷 1017-1024页

作者： LIU Yang 1,& CHEN ZhiHua 2 1 Department of mathematics,Zhejiang Normal university,Jinhua 321004,china 2 Department of mathematics,tongji university,shanghai 200092,china 1. Department of mathematics Zhejiang Normal University Jinhua 321004 China2. Department of Mathematics Tongji University Shanghai 200092 China

We give higher order derivatives Schwarz-Pick estimates for all positive real part holomorphic functions on Bn and D n,and generalize early work on Schwarz-Pick estimate of higher order derivatives for holomorphic fun... 详细信息

关键词： Schwarz-Pick estimate holomorphic function Taylor expansion

THE MODULI SPACE OF COMPLEX LAGRANGIAN SUBMANIFOLDS IN THE HYPER-KAEHLER MANIFOLD

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of mathematics,Series B 1999年第4期20卷 393-400页

作者： FU JIXIANG(institute of mathematics, Fudan university, shanghai 200433, china) Fudan Univ Inst Math Shanghai 200433 Peoples R China

The deformation of a compact complex Lagrangian submanifold in a hyper-Kaehler manifold and the moduli space are studied. It is proved that the moduli space Mc1 is a special Kaehler manifold, where special means that there is a real flat torsionfree symplectic connection satisfying dI = 0 (I is a complex structure of Mcl). Thus, following [4], one knows thatT*Mcl is a hyper-Kaehler manifold and then that Mcl is a complex Lagrangian submanifold in T* Mcl.

关键词： Moduli space Complex Lagrangian submanifold Hyper-Kaehler manifold Special Lagrangian submanifold Special Kaehler manifold Deformation

p-th moment exponential stability of stochastic differential equations with impulse effect

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2011年第8期54卷 1702-1711页

作者： SHEN LiJuan 1,2 & SUN JiTao 11 Department of mathematics, tongji university,shanghai 200092,china 2 Department of mathematics,Luoyang Normal university, Luoyang 471022,china 1. Department of mathematics Tongji University Shanghai 200092 China2. Department of Mathematics Luoyang Normal University Luoyang 471022 China

The p-th moment exponential stability of stochastic differential equations with impulse effect is *** employing the method of vector Lyapunov functions,some sufficient conditions for the p-th moment exponential stability are *** addition,the usual restriction of the growth rate of Lyapunov function is replaced by the condition of the drift and diffusion coefficients to study the p-th moment exponential *** examples are also discussed to illustrate the effectiremess of the results obtained.

关键词： stochastic differential equations impulse p-th moment exponential stability vector Lyapunov functions

ON SUBALGEBRAS OF CHEVALLEY ALGEBRAS CONCERNING SUBFIELDS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1996年第1期9卷 13-19页

作者： ZHA Jianguo(Department of Applied mathematics,tongji university, shanghai 200092,china) 同济大学应用数学系上海

ＯＮＳＵＢＡＬＧＥＢＲＡＳＯＦＣＨＥＶＡＬＬＥＹＡＬＧＥＢＲＡＳＣＯＮＣＥＲＮＩＮＧＳＵＢＦＩＥＬＤＳ￥ＺＨＡＪｉａｎｇｕｏ（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄＭａｔｈｅｍａｔｉｃｓ，ＴｏｎｇｊｉＵｎｉｖｅｒｓｉ... 详细信息

ＯＮＳＵＢＡＬＧＥＢＲＡＳＯＦＣＨＥＶＡＬＬＥＹＡＬＧＥＢＲＡＳＣＯＮＣＥＲＮＩＮＧＳＵＢＦＩＥＬＤＳ￥ＺＨＡＪｉａｎｇｕｏ（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄＭａｔｈｅｍａｔｉｃｓ，ＴｏｎｇｊｉＵｎｉｖｅｒｓｉｔｙ，Ｓｈａｎｇｈａｉ２０００９２...

关键词： Semi-simple Lie algebras subalgebras.