检索结果-南通市图书馆

GLOBAL ATTRACTIVITY IN A PERIODIC DELAY SINGLE SPECIES MODEL

在线全文

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 2000年第1期13卷 1-6页

作者： LI Yong kun (department of mathematics,{2., kunming 650091, china) 云南大学数学系云南昆明 650091

***[1]illtroducedthefollowingdelayLotka-Volterratypesinglespeciespopulationgrowthmodel:wherea,b,ctTarerealconstants,anda>0,c>0,***>0,b0,(l.1)exhibitstheso--calledAlic... 详细信息

***[1]illtroducedthefollowingdelayLotka-Volterratypesinglespeciespopulationgrowthmodel:wherea,b,ctTarerealconstants,anda>0,c>0,***>0,b0,(l.1)exhibitstheso--calledAlic...

关键词： Single species population growth positive periodic solution global attractivity foedholm mapping.

Finite Dimension of Global Attractor of Nonlinear Strain Waves in Elastic Waveguides

在线全文

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 1998年第3期3卷 173-176页

作者： Dacai MA and Murong JIANG(department of mathematics, Shangrao Teacher’s College, Shangrao 334000,{2.)(department of mathematics, yunnan university, kunming 650091, china)E-mail: jemail@*** department of mathematics Shangrao Teacher's College Shangrao 334000 China department of mathematics Yunnan University Kunming 650091 China

Consider herein are the finite dimension of global attractor of nonlinearstrain waves in elastic waveguides. By constructing two appropriate bounded coerciveguadratic forms and analysis of evolution of volume in E1 sp... 详细信息

关键词： strain wave attractor Hausdorff and fractal dimensions

Finite Dimensional Behavior of Global Attractors for Weakly Damping Ginzburg-Landau Equations Coupling with BBM Equations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 1998年第1期3卷 10-14页

作者： Boling GUO * and Murong JIANG + *(Institute of Applied Physics and Computational mathematics,Beijing,100088,china) +({2. of mathematics,yunnan university,kunming 650091,china) E mail:guobl@*** Inst. Appl. Phys. and Compl. Math. Beijing 100088 China department of mathematics Yunnan University Kunming 650091 China

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｈｉｓｐａｐｅｒｗｅａｒｅｃｏｎｃｅｒｎｅｄｗｉｔｈｔｈｅｌｏｎｇｔｉｍｅｂｅｈａｖｉｏｒｏｆｓｏｌｕｔｉｏｎｓｏｆｔｈｅｆｏｌｏｗｉｎｇｐｅｒｉｏｄｉｃｉｎｉｔｉａｌｖａｌｕｅｐｒｏ... 详细信息

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｈｉｓｐａｐｅｒｗｅａｒｅｃｏｎｃｅｒｎｅｄｗｉｔｈｔｈｅｌｏｎｇｔｉｍｅｂｅｈａｖｉｏｒｏｆｓｏｌｕｔｉｏｎｓｏｆｔｈｅｆｏｌｏｗｉｎｇｐｅｒｉｏｄｉｃｉｎｉｔｉａｌｖａｌｕｅｐｒｏｂｌｅｍｆｏｒｔｈｅｓｙｓｔｅｍｏ...

关键词： dimension attractor Ginzburg Landau equation couped BBM equationIntroduction

The Nature of Bonding in PtN

在线全文

同方期刊数据库

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

Periodic Solutions of N-Species Competition System with Time Delays

在线全文

学校读者我要写书评

暂无评论

生物数学学报 1997年第1期12卷 1-7页

作者： Li Yongkun(department of mathematics,{2. university,kunming 650091,People's Republic of china) 云南大学数学系云南昆明 650091

In this Paper,we establish the existence of a positive periodic solution for and obtain sufficient conditions for the periodic solution to be globally attractive.

关键词： N-species competition system periodic solution delay system global attractivity

The Nature of Bonding in IrC

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第12期9卷 0-0,0-0页

作者： Xiao Guang XIE Huai CAO (Modem Biological Center, yunnan university, kunming 650091)Xian Jun BI ({2. of Chemistry, yunnan Normal university, kunming 650092.Shu Shan Dai ({2. of Chemistry, yunnan university, Kunndng 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 stUdied by using CASSCF andFOCI techniques. The ground state of IrC has been found to be 2. arising primarilyfrom:.. 1σ2.2.2.1π4 1δ3 3σ2.configuration, which forms a triple bond between Ir and C atoms (one σ;two π). The lowest quartet state is 4Φ state which has the configuration:... 1σ2.2.2.1π4 1δ3 2.1 3σ2.andlies higher than the ground state by 1 .2.eV. The molecular constants of the ground state calculatedat CASSCF level by using Morse's mode are: Re=1.6904A, De=4.86eV, We=1139cm-1, andB0=0.52.9cm-1 comparable with the spectrum values (Re=1 .6858A, De=6.44 eV, We=1051cm-1and B0=0.52.1 cm-1).

关键词： Nature of bonding IrC molecular constants CASSCF

Hemin-mediated Hemolysis in Erythrocytes:Effects of Ascorbic Acid and Glutathione

在线全文

学校读者我要写书评

暂无评论

Acta Biochimica et Biophysica Sinica 2006年第1期38卷 63-69页

作者： Shu-De LI~(1,2.,Yan-Dan SU~3,Ming LI~1,and Cheng-Gang ZOU~(1*) ~1 School of Life Sciences,yunnan university,{2. 650091,china ~2.department of Biochemistry and~3 department of Clinical Chemistry,{2. Medical College.{2. 650031,china School of Life Sciences Yunnan University Kunming 650091 China department of Biochemistry Kunming Medical College Kunming 650031 China department of Clinical Chemistry Kunming Medical College Kunming 650031 China

In the present work,we investigated the effect of ascorbic acid and glutathione on hemolysisinduced by hemin in *** acid not only enhanced hemolysis,but also induced formationof thiobarbituric acid-reactive substances in the presence of *** has been shown that glutathioneinhibits hemin-induced hemolysis by mediating hemin *** depleted of glutathionebecame very sensitive to oxidative stress induced by hemin and ascorbic acid.H2.2.as involved in hemin-mediated hemolysis in the presence of ascorbic ***,a combination of glutathione and ascorbicacid was more effective in inhibiting hemolysis induced by hemin than glutathione *** andintracellular ascorbic acid exhibited a similar effect on hemin-induced hemolysis or inhibition of hemin-induced hemolysis by *** current study indicates that ascorbic acid might function as anantioxidant or prooxidant in hemin-mediated hemolysis,depending on whether glutathione is available.

关键词： erythrocyte ascorbic acid hemin glutathione H2.2

S-wave velocity and Poisson's ratio structure of crust in yunnan and its implication

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 2005年第2期48卷 210-218页

作者： HU Jiafu, SU Youjin, ZHU Xiongguan & CHEN Yun Geophysical department of yunnan university,{2., china Seismological Bureau of yunnan Province, kunming 650041, china Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, china Geophysical department of yunnan university Kunming China Seismological Bureau of yunnan Province Kunming China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

Receiver function of body wave under the 2. stations in yunnan was extracted from 3-component broadband digital recording of teleseismic event. Thus, the S-wave velocity structure and distribution characteristics of Poisson's ratio in crust of yunnan are obtained by inversion. The results show that the crustal thickness is gradually thinned from north to south. The crustal thickness in Zhongdian of northwest reaches as many as 62.0 km and the one in Jinghong of further south end is only 30.2.km. What should be especially noted is that there exists a Moho upheaval running in NS in the Chuxiong region and a Moho concave is generally parallel to it in Dongchuan. In addition, there exists an obvious transversal inhomogeneity for the S-wave velocity structure in upper mantle and crust in the yunnan region. The low velocity layer exists not only in 10.0-15.0 km in upper crust in some regions, but also in 30.0-40.0 km in lower crust. Generally, the Poisson's ratio is on the high side, however it has a better corresponding relation to the crustal velocity structure. An obvious block distribution feature is still shown on such a high background of Poisson's ratio. It is discovered by synthetically analyzing the velocity structure and Poisson's ratio distribution that there are high Poisson's ratio and complicated crust-mantle velocity structure feature in the Sichuan-yunnan Diamond Block with Xiaojiang fault to be the east boundary and Yulong Snow Mountain fault to be the west boundary besides the frequent seismicity. This feature differs obviously from that of surrounding areas, which would provide geophysical evidence to deeply study the eastwardly flowage of lithospheric substances in the Qinghai-Tibet Plateau.

关键词： yunnan, S-wave velocity, Poisson's ratio, Sichuan-yunnan Diamond Block.

Bifurcations of travelling wave solutions for two generalized Boussinesq systems

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2008年第9期51卷 1577-1592页

作者： LI JiBin1,2.1 department of mathematics, Zhejiang Normal {2., Jinhua 32.004, china 2.department of mathematics, kunming {2. of Science and Technology, kunming 650093, china department of mathematics Zhejiang Normal University Jinhua China department of mathematics Kunming University of Science and Technology Kunming China

Using the methods of dynamical systems for two generalized Boussinesq systems, the existence of all possible solitary wave solutions and many uncountably infinite periodic wave solutions is obtained. Exact explicit parametric representations of the travelling solutions are given. To guarantee the existence of the above solutions, all parameter conditions are determined.

关键词： nonlinear wave bifurcation solitary wave exact explicit solution generalized Boussinesq system 34C37 34C2. 74J30 58Z05