检索结果-南通市图书馆

On the periodic solutions of a type of differential-iterative equations

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第3期43卷 204-206页

作者： GE Weigao 1, LIU Zhengrong 2.and YU Yuanhong 3 1. department of Applied Mathematics, Beijing Institute of Technology, Beijing 100081, china 2. department of Mathematics, yunnan university, kunming 650091, china 3. Institute of Applied Mathematics, C department of Applied Mathematics Beijing Institute of Technology Beijing China department of Mathematics Yunnan University Kunming China Institute of Applied Mathematics Chinese Academy of Sciences Beijing China

Sufficient conditions for the existence of periodic solutions to a type of nonautonomous differential_iterative equations are given.

关键词： differential_iterative equation periodic solution fixed point.

Exponential attractors of the nonlinear wave equations

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第16期43卷 1331-1335页

作者： DAI Zhengde 1 and MA Dacai 2.1. department of Mathematics, yunnan university, {2. 650031, china 2. department of Mathematics, Shangrao Teachers College, Shangrao 334000, china department of Mathematics Yunnan University Kunming China department of Mathematics Shangrao Teachers College Shangrao China

The (E, E)-type exponential attractors for the nonlinear wave equation were obtained by using the decomposition of operators and finite covering *** results solves the open problem of Eden et al.

关键词： nonlinearity wave equations exponential attractors.

Response to“Discussion on the systematic position of the Early Cambrian priapulomorph worms”

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2006年第2期51卷 250-256页

作者： HAN Jian1 & HU Shixue2.1. department of Geology and Key Laboratory for Continental Dynam- ics of the Education Ministry, Northwest university, Xi’an 710069,{2. 2. yunnan Geological Institute, kunming 650011,{2. department of Geology and Key Laboratory for Continental Dynamics of the Education Ministry Northwest University Xi’an China yunnan Geological Institute Kunming China

A response by Han Jian & Hu Shixue to a letter to the editor about their article 'Systematic Position of the Early Cambrian priapulomorph worms' in the 2.04 issue is presented.

关键词： Response to Discussion on the systematic position of the Early Cambrian priapulomorph worms

Interannual variability of Antarctic Oscillation and its influence on East Asian climate during boreal winter and spring

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Earth Sciences 2006年第5期49卷 554-560页

作者： FAN Ke1,2.3 & WANG Huijun2.1. Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 10002., china 2. department of Atmospheric Science,{2., kunming 650091, china 3. Graduate university of the Chinese Academy of Sciences, Beijing 100049, china Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China department of Atmospheric Science Yunnan University Kunming China Graduate university of the Chinese Academy of Sciences Beijing China

The interannual variability of Antarctic Oscillation (AAO) and its influence on East Asian climate during both boreal winter and spring are addressed. The results show that the positive AAO anomaly decreases the cold activity over East Asia during both boreal winter and spring. AAO-related barotropic meridional teleconnection from Antarctic to Arctic is found through analysis of mean me- ridional circulations. This meridional teleconnection is remarkable over Eurasia during boreal winter and over the Pacific Ocean during boreal spring. The results also show that zonal mean zonal wind at high latitudes in Southern Hemisphere has well positive correlation with that of Eurasia during boreal winter and has negative correlation with Pacific North American teleconnection (PNA) during boreal spring, which again display the meridional teleconnection. Thus, local meridional teleconnection is a possible linkage for interaction of circulations at mid-high latitudes between both hemispheres.

关键词： Antarctic Oscillation, Eurasian west wind, meridional teleconnection, mean meridional circulation.

The right dual of left C-rpp semigroups

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第19期42卷 1599-1603页

作者： GUO Yuqidepartment of Mathematics, yunnan university,{2., china department of Mathematics Yunnan University Kunming China

SEMIGROUP S is said to be rpp (dually, lpp) if every principal right ideal aS^1(S^1a) of S, re-garded as a right (left)S^1-system, is projective. The semigroup which is both rpp and lpp is said to be abundant. These kinds of generalized regular semigroups have aroused wideattention. The Green’s,relations (~*-Green’s relations introduced by Pastijn) have formed avery useful tool in study on regular (abundant) semigroups. In order to develop the study onrpp semigroups a step further, we introduced the so-called (1)-Green’s,relation which

关键词： rpp semigroups left (right) C-rpp semigroups. (I)-Green’s relations.

Abundant Semigroups with a Multiplicative Adequate Transversal

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2002年第2期18卷 229-244页

作者： GUO Xiao Jiang department of Mathematics.yunnan {2..kunming 650091,P.R.china department of Mathematics Yunnan University Kunming P. R. China

The aim of this paper is to investigate abundant semigroups with a multiplicative adequate *** properties and characterizations for such semigroups are *** particular. we establish the structure of this class of abundant semigroups in terms of left normal bands,right normal braids and adequate semigroups with some simple Compatibility *** apply this structure to some special cases.

关键词： Abundant semigroup Adequate semigroup Left(Right)normal band

The Nature of Bonding in PtN

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第7期9卷 687-690页

作者： Xiao Guang XIE Xian Jun BI Huai CAO Shu Shan DAI (Modem Biological Center, yunnan university, kunming 650091)({2. of Chemistry, yunnan Normal university, kunming 650092.({2. of Chemistry, yunnan university, kunming 650091) Modern Biological Center Yunnan University Kunming 650091 China department of Chemistry Yunnan Normal University Kunming 650092 China department of Chemistry Yunnan University Kunming 650091 China

The nature of bonding in the title compound has been studed by using CASSCF techniques. The ground state of PtN is found to be (2.Pi state arising primarily from: 1 sigma(2.2.sigma(2.1 pi(4)1 delta(4)3 sigma(2.2.pi(1) configuration, which forms triple bond between Pt and N atoms tone sigma, two pi). The lowest quartet state is (4)Sigma(-) State which has the configuration: ...1 sigma(2.2.sigma(2.1 pi(4)1 delta(4)3 sigma(1)2.pi(2. and lies higher than the ground state by 0.43eV.

关键词： PtN nature of bonding molcular constants CASSCF

Density-functional formula for strongly correlated systems

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2005年第5期15卷 395-401页

作者： WANG Huaiyu1*, HAN Rushan2.and CHEN Nanxian1(1. department of Physics, Tsinghua university, Beijing 100084,{2. 2. department of Physics, Peking university, Beijing 100871,{2.) department of Physics Tsinghua University Beijing 100084 China department of Physics Peking University Beijing 100871 China

Density functional method is applied for strongly correlated systems. Based on the assumption that the systems are composed of electrons in singly-occupied orbitals and those in doubly-occupied orbitals, a set of self-consistent equations are obtained by standard variation procedure. The equations consist of two parts. One part is to solve the wave functions of the electrons in singly-occupied orbitals and the other is to solve the wave functions of the electrons in doubly-occupied orbitals. The physical meanings of the terms appearing in the equations are discussed.

关键词： density-functional theory strongly correlated systems doubly-occupied orbital two-particle wave function self-consistent equations.

High-energy radiation from old pulsars

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2010年第S1期53卷 135-138页

作者： JIANG ZeJun1,2.& ZHANG Li2.1 yunnan Astronomical Observatory,National Astronomical Observatories,Chinese Academy of Sciences,kunming 650011,{2. 2.department of Physics,yunnan university,kunming 650091,{2. yunnan Astronomical Observatory National Astronomical Observatories Chinese Academy of Sciences Kunming China department of Physics Yunnan University Kunming China

In this paper,we study nonthermal high energy radiation from old rotation-powered pulsars with ages greater than 106 yr based on the revised outer gap *** this model,the inclination angle and geometry of the magnetic field have been taken into account,and the fractional size f of the outer gap is determined by the electron/positron pair production *** cascade process caused by the back-flowing particles moving from the outer gap to the star will produce the observed nonthermal X-ray emission,and the relativistic particles accelerated in the outer gap will produce gamma-rays via curvature *** nine old pulsars which have been detected to have nonthermal X-rays,we first use the observed nonthermal X-ray emission to estimate reasonable inclination angles,and then estimate their gamma-ray *** also study the possibilities of gamma-ray emissions from other old rotation-powered *** compare our predicted gamma-ray flux with the sensitivities of AGILE and Fermi.

关键词： superbubble HII region cluster PAH dust