检索结果-南通市图书馆

Romanoff theorem in a sparse set

热烈庆祝中国化学会成立80周年——中国化学会第16届反应性高分子学术研讨会

作者： Ying Meng~1,Jinnan Wang~(1,2*),Chen Chen~1,Xin Yang~1 1.State Key Laboratory of Pollution Control and Resource Reuse & School of the Environment, 2.nanjing university,nanjing 210046,china

1 Introduction Arsenic is a toxic and carcinogenic element which occurs naturally in soils,rocks and *** of arsenic-contaminated drinking water can cause long-term health ***,arsenic contamination of water/groundwater...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science china Mathematics 2010年第9期53卷 2195-2202页

作者： CHEN Yong-Gao School of Mathematical Sciences,nanjing Normal university,nanjing 210046,china School of Mathematical Sciences Nanjing Normal University Nanjing China

Let A be any subset of positive integers,and P the set of all positive *** of our results are:(a) the number of positive integers which are less than x and can be represented as 2k + p(resp.p-2k) with k ∈ A and p ∈ P is more than 0.03A(log x/log 2)π(x) for all sufficiently large x;(b) the number of positive integers which are less than x and can be represented as 2q + p with p,q ∈ P is(1 + o(1))π(log x/log 2)π(x).Four related open problems and one conjecture are posed.

关键词： Romanoff theorem Polignac conjecture asymptotic density

Present Status and Future Development of Mobile Internet

在线全文

学校读者我要写书评

暂无评论

china Communications 2009年第1期6卷 113-118页

作者： Wang Jian1, Bi Houjie2 1nanjing university, nanjing 210093, china 2nanjing university of Posts and Telecommunications, nanjing 210003, china nanjing university Nanjing 210093 China nanjing university of Posts and Telecommunications Nanjing 210003 China

With the integration of telecommunications network and Internet, mobile Internet is bound to rise. Mobile Internet brings not only high-quality business experience; but also enormous challenges to telecommunications. The current status and hierarchical structure of the mobile Internet are presented. Technological advances and market demand are promoting development of mobile Internet, and terminals, networks and businesses are three elements of the development of the mobile Internet. Mobile IP technique and related protocols are described systematically, which are designed to allow mobile terminal and the mobile sub-network to roam within the Internet. Then the IP Multimedia Subsystem (IMS) and its architectural framework are expounded, which are designed by (3GPP). The credible and reliable IP network architecture with Quality of Service (QoS) based on IMS is discussed to meet the needs of the next generation of mobile Internet. Finally, the hotspots such as P2P/ Multicast/ Security are pointed out within the mobile Internet.

关键词： Mobile Internet mobile IP IMS network convergence

Basic study on architectural planning of psychiatric hospital

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(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 China nanjing university of Science & Technology Nanjing China

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

On critical values concerning the evolution of the long period families

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2009年第4期9卷 494-500页

作者： Xi-Yun Hou1,21 Astronomy Department, nanjing university, nanjing 210093, china 2 Institute of Space Environment and Astronautics, nanjing university, nanjing 210093, china Astronomy Department Nanjing University Nanjing 210093 China Institute of Space Environment and Astronautics Nanjing University Nanjing 210093 China

In a previous paper, we proposed another special critical value concerning the evolution of the long period family around the equilateral equilibrium points, besides the two values given by Henrard. Are there any other special critical values？ After studying the stability curves of the long period family carefully, we gave a negative answer. During the study, we found an interesting family of periodic orbits which we called the homo family. We studied the evolution of this family following the increase of μ. With these findings, we were able to explain the origin of the four branches of periodic families emanating from L4 and the stability results of the equilateral equilibrium points.

关键词： celestial mechanics

An Accurate Rate Control Algorithm for Mobile Wireless Channel

在线全文

学校读者我要写书评

暂无评论

china Communications 2009年第1期6卷 119-122页

作者： Ma Guoqiang1 , Bi Houjie2 1nanjing university, nanjing 210093, china 2nanjing university of Posts and Telecommunications, nanjing 210093, china nanjing university Nanjing 210093 China nanjing university of Posts and Telecommunications Nanjing 210093 China

A novel rate control algorithm for extremely low bit rate and wireless channels is specified in this paper. The algorithm does rate analysis at an MB (Macro Block) level, and extracts the energy from motion and texture characteristics, finally allocates bits and controls the fluctuation according to the MB energy. Experimental results show that a higher accuracy of allocation of bit rate is achieved and the output bit rate is much smoother, as well as the improvement of subjective quality is considerable.

关键词： rate control low bitrate wireless channel video coding

L-R smash products for bimodule algebras

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2006年第6期16卷 580-587页

作者： ZHANG Liangyun (Department of Mathematics, nanjing Agricultural university, nanjing 210095, china Department of Mathematics, nanjing university, nanjing 210008, china) Department of Mathematics Nanjing Agricultural University Nanjing 210095 China Department of Mathematics Nanjing U-niversity Nanjing 210008 China

In this paper, we prove that the L-R smash product A(?)H is exactly the twisted smash product A * H if H is a finite dimensional cocommutative Hopf algebra, and give a sufficient and necessary condition for L-R smash products to be bialgebras (Hopf algebras) . For any finite dimensional coquasitriangular Hopf algebra (H,σ), we prove that the L-R smash product H(?)H is semisimple Artinian if H is semisimple and H * is unimodular. In particular, the L-R smash product D(H)* (?)D(H)* semisimple Artinian if the Drin-fel'd double D(H) is semisimple.

关键词： bimodule algebras L-R smash products coquasitriangular Hopf algebras Long bialgebras.

A three level linearized compact difference scheme for the Cahn-Hilliard equation

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 Mathematics 2012年第4期55卷 805-826页

作者： LI Juan 1,2 ,SUN ZhiZhong 1,& ZHAO Xuan 1 1 Department of Mathematics,Southeast university,nanjing 210096,china 2 Yingtian College,nanjing 210046,china Department of Mathematics Southeast University Nanjing China Yingtian College Nanjing China

This article is devoted to the study of high order accuracy difference methods tor the Cahn-rnmara equation. A three level linearized compact difference scheme is derived. The u^ique solvability and uaconditional convergence of the difference solution are proved. The convergence order is O（T2＋h4） in the maximum norm. The mass conservation and the non-increase of the total energy are also verified. Some numerical examples are given to demonstrate the theoretical results.

关键词： Cahn-Hilliard equation compact difference scheme convergence solvability conservation energynon-increase

Maschke-type theorem and Morita context over weak Hopf algebras

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2006年第5期49卷 587-598页

作者： ZHANG Liangyun College of Science, nanjing Agricultural university, nanjing 210095, china Department of Mathematics, nanjing university, nanjing 210008, china College of Science Nanjing Agricultural University Nanjing China Department of Mathematics Nanjing University Nanjing China

This paper gives a Maschke-type theorem over semisimple weak Hopf algebras,extends the well-known Maschke-type theorem given by Cohen and Fishman and constructs a Morita context over weak Hopf algebras.

关键词： weak Hopf algebra, smash product, Maschke-type theorem, Morita context.