检索结果-南通市图书馆

Quasi-periodic solutions with prescribed frequency in a nonlinear Schrdinger equation

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2010年第12期53卷 3067-3084页

作者： REN Xiu-Fang Department of Mathematics, nanjing University, nanjing 210093, China Department of Mathematics Nanjing University Nanjing China

In this paper, one-dimensional (1D) nonlinear Schrdinger equation iut-uxx + Mσ u + f ( | u | 2 )u = 0, t, x ∈ R , subject to periodic boundary conditions is considered, where the nonlinearity f is a real analytic function near u = 0 with f (0) = 0, f (0) = 0, and the Floquet multiplier Mσ is defined as Mσe inx = σne inx , with σn = σ, when n 0, otherwise, σn = 0. It is proved that for each given 0 1, the above equation admits a Whitney smooth family of small-amplitude quasi-periodic solutions with b-dimensional Diophantine frequencies, corresponding to b-dimensional invariant tori of an associated infinite-dimensional Hamiltonian system. Moreover, these b-dimensional Diophantine frequencies are the small dilation of a prescribed Diophantine vector. The proof is based on a partial Birkhoff normal form reduction and an improved KAM method.

关键词： Schrdinger equation Hamiltonian system Birkhoff normal form quasi-periodic solution

The Sedimentologic-Geotectonic Evolution in the Jiangsu-Zhejiang-Anhui Region

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 1989年第2期63卷 127-137页

作者： Xia Bangdong and Lu Hongbo Department of Earth Sciences, nanjing University, nanjing, Jiangsu Liu Linqun Department of Earth Sciences Nanjing University Nanjing Jiangsu

The Yangtze plate, extending from east to west in southern China, was formed about 800 Ma ago. Since the Sinian, two aulacogens trending east-northeast and connected at the east ends, have been initiated in the Jiangsu-Zhejiang-Anhui region on the east margin of the plate with a sedimentary sequence up to 10,000 m in thickness. At a later stage of sedimentologic evolution, flysch and molasse were produced. The flyseh was accumulated in the Late Ordovician, when the two aulacogens became bays that opened to the east; the elastic materials were derived from the Yangtze oldland on the northern and southern sides of the basins. The molasse was accumulated from the terminal Late Ordovician to the Middle Ordovician; the clastie materials came from an uplifted orogenic belt in the east. This indicates that a major change in the tectonic pattern of the basins has taken place.

关键词： Ordovician sedimentary accumulated Jiangsu Anhui northeast tectonic Yangtze sandstone margin

Lie comodules and the constructions of Lie bialgebras

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2008年第6期51卷 1017-1026页

作者： ZHANG LiangYun College of Science,nanjing Agricultural University,nanjing 210095,China College of Science Nanjing Agricultural University Nanjing China

In this paper,we first give a direct sum decomposition of Lie comodules,and then accord- ing to the Lie comodule theory,construct some(triangular)Lie bialgebras through Lie coalgebras.

关键词： Lie coalgebras Lie comodules Lie bialgebras triangular Lie bialgebras 16W30

Statistic Characteristics of Logistic Iteration and its Application inGenerating Even Distributed Random Numbers

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2期3卷 3-5页

作者： Nailong GUO (Department of Aerodynamics, nanjing University of Aeronautics and Astronautics, nanjing 210016, China) Department of Aerodynamics Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

ＩｎｔｒｏｄｕｃｔｉｏｎＬｏｇｉｓｔｉｃｉｔｅｒａｔｉｏｎｐｒｏｖｉｄｅｓａｓｉｍｐｌｅｍａｔｈｅｍａｔｉｃａｌｍｏｄｅｌｔｏｅｘｈｉｂｉｔｃｈａｏｔｉｃｂｅｈａｖｉｏｒａｎｄｈａｓｂｅｅｎｒｅｓｅａｒｃｈｅｄｂｙａ... 详细信息

ＩｎｔｒｏｄｕｃｔｉｏｎＬｏｇｉｓｔｉｃｉｔｅｒａｔｉｏｎｐｒｏｖｉｄｅｓａｓｉｍｐｌｅｍａｔｈｅｍａｔｉｃａｌｍｏｄｅｌｔｏｅｘｈｉｂｉｔｃｈａｏｔｉｃｂｅｈａｖｉｏｒａｎｄｈａｓｂｅｅｎｒｅｓｅａｒｃｈｅｄｂｙａｌｏｔｏｆｒｅｓｅａｒｃｈｅｒｓ［...

关键词： Logistic iteration even distributed random numbers statistic characteristics

Study on the Compatibility of SMA and Composite Materials by Holographic Interferometry

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 Journal of Lasers 2000年第6期9卷 66-71页

作者： ZHAO Zhimin (Applied Optics Research Section, nanjing University of Aeronautics & Astronautics, nanjing 210016, China) Applied Opt. Res. Section Nanjing Univ. of Aeron. and Astron. Nanjing 210016 China

With the help of holographic interferometry a study is conducted on the compatibility of SMA (shape memory alloy) and epoxy resin composite material. The paper gives experiment results and analysis which show that after coupling SMA with the composite material, the flexural rigidity of composite material is somewhat reinforced. Under certain conditions, SMA and the epoxy resin composite material are compatible.

关键词： SMA composite material compatibili?

In－situ　Thin　Layer　Spectroelectrochemical　Study　of　the　Redox　Mechanism　add　Intermediate　for　Vitamin　B_2　in　Aqueous　Solution

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 1996年第9期7卷 825-828页

作者： Yong Jun MA Shi Min ZHU(Department of Chemistry, nanjing University,nanjing,210093) Department of Chemistry Nanjing University Nanjing 210093

The electrochemical reaction mechanism of Vitamin B2 on platinum electrode in acid aqueous solution has been studied by then layer cyclic voltammetry(TLCV) and thin layer spectroelectrochemistry (TLSEC).The results indicate that there is a redox process of VB2 via a semiquinone radical to dihydroflavin. The radical intermediate has been detected by in-situ UVSEC method for the first time.

关键词： Thin Layer Aqueous Intermediate

Birkhoff's theorem and viscosity solutions of Hamilton-Jacobi equations

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2009年第8期52卷 1796-1800页

作者： CHENG Wei Department of Mathematics, nanjing University, nanjing 210093, China Department of Mathematics Nanjing University Nanjing China

We obtain a partial generalization of Birkhoff's theorem of invariant curve to higher dimesional case in the context of viscosity solutions of Hamilton-Jacobi equations, or weak KAM theory. This is a new approach afte... 详细信息

关键词： Hamilton-Jacobi equation viscosity solution semiconcave function

Basic study on architectural planning of psychiatric hospital

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2010年第7期53卷 1755-1767页

作者： ZHOU Ying1 & SUN YaoNan2 1 Southeast University, nanjing 210096, China 2 nanjing University of Science & Technology, nanjing 210094, China Southeast University nanjing University of Science & Technology

This paper considers the main problems of the current mental health facilities in China from the standpoint of architects on the background that mental disorder has become a serious threat to human health. In order to effectively learn from the developed countries, this paper reviews the brief history of the world's mental health and the main phases of the evolution of psychiatric hospitals, analyzes the actual situation of mental health facilities abroad based on a large amount of data, compares the roles of public and private psychiatric hospitals from the viewpoint of government supervision, and investigates the functions and positions of psychiatric hospitals and the psychiatry divisions of general hospitals in the medical system. At last, this paper discusses the necessity of the systemization of mental health facilities, the role of psychiatric hospitals in this facility system and the developing approaches of psychiatric hospitals in China.

关键词： medical facility for mental disorder facility system psychiatric hospital principles

Effect of bismuth species on propylene aromatization over BiHZSM-5 catalysts

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1994年第4期12卷 295-304页

作者： MIAO, Cheng-MingDepartment of Chemistry, Jiangsu Institute of Education, nanjing, Jiangsu 210013, ChinaWU, Chuan-Chang FENG, Lin Department of Chemistry, nanjing University, nanjing, Jiangsu 2.0008, China Department of Chemistry Jiangsu Institute of Education Nanjing Jiangsu 210013 China Department of Chemistry Nanjing University Nanjing Jiangsu 210008 China

The catalytic behavior of Bi-impregnated HZSM-5 zeolites in propylene aroma-tization and the surface properties of the zeoh'tes were determined by microreactor, XRD, XPS, NH3-TPD and IR-TPD. The mechanism of the reaction and the effect of surface properties of the zeolites on the reaction were also investigated. Experimental data showed that Bi-impregnation made the strength of B-acid sites decrease, the strength of L-acid sites and the concentration of both strong B-acid sites and strong L-acid sites increase. Bi-impregnation also induced sub-strong acid sites. These were the factors that made the aromatic products of the reaction increase. The strong interaction between the impregnant and zeolite surface reached maximum at Bi2O3 = 3.5 wt%. Above this value, covering effect of impregnant caused a decrease of aromatic products.

关键词： Aromatization Bi-impregnation ZSM-5 Propylene.