首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   156篇
  国内免费   25篇
  完全免费   7篇
  数学   188篇
  2016年   2篇
  2015年   1篇
  2014年   7篇
  2013年   5篇
  2012年   4篇
  2011年   9篇
  2010年   6篇
  2009年   3篇
  2008年   5篇
  2007年   14篇
  2006年   10篇
  2005年   12篇
  2004年   9篇
  2003年   8篇
  2002年   2篇
  2001年   9篇
  2000年   9篇
  1999年   11篇
  1998年   8篇
  1997年   7篇
  1996年   9篇
  1995年   6篇
  1993年   7篇
  1992年   3篇
  1991年   4篇
  1990年   2篇
  1989年   2篇
  1987年   1篇
  1986年   2篇
  1984年   4篇
  1983年   6篇
  1982年   1篇
排序方式: 共有188条查询结果,搜索用时 187 毫秒
1.
InroductionLet us consider the following irst order quaslllnear hyperbolic  相似文献
2.
DELAY SYSTEMS AND OPTIMAL CONTROL   总被引:8,自引:0,他引:8  
0. IntroductionIt is well known that evolution systems are an important class of distributed parametersystems and the optimal control of infinite dimensional systems is a remarkable subjectin control theory. Some authors including us investigated the existence of solutions orperiodic solutions (see [l--4] or [5,6] ). To the knowledge of the authors, optimal controls fordistributed parameter delay systems have not been extensively studied. Li and Yao obtaina maximum principle (see [7]). Here w…  相似文献
3.
By using the method of coincidence degree and Lyapunov functional, a set of easily applicable criteria are established for the global existence and global asymptotic stability of strictly positive(componentwise)periodic solution of a periodic n-species Lotka-Volterra competition system with feedback controls and several deviating arguments.The problem considered in this paper is in many aspects more general and incorporate as special cases various problems which have been studied extensively in the literature.Moreover,our new criteria,which improve and generalize some well known results, can be easily checked.  相似文献
4.
First of all we introduce the concepts of infinitely dimensional control Markov branching chains in random environments (β-MBCRE) and prove the existence of such chains, then we introduce the concepts of conditional generating functionals and random Markov transition functions of such chains and investigate their branching property. Base on these concepts we calculate the moments of the β-MBCRE and obtain the main results of this paper such as extinction probabilities, polarization and proliferation rate. Finally we discuss the classification of β-MBCRE according to the different standards.  相似文献
5.
GLOBAL ATTRACTIVITY IN A PERIODIC COMPETITION SYSTEM WITH FEEDBACK CONTROLS   总被引:5,自引:0,他引:5  
WENGPEIXUAN(翁佩萱)(DepartmentofMathematics,SouthChinaNormalUniversity,Guangzhou510631,China)GLOBALATTRACTIVITYINAPERIODICCOMPET...  相似文献
6.
A CLASS OF STATIONARY MODELS OF SINGULAR STOCHASTIC CONTROL   总被引:4,自引:0,他引:4  
A class of stationary models of singular stochastic control has been studied,in which the state is extended to solution of a class of S.D.E. from Wiener process. The existence of optimal control has been proved in all cases under some weaker conditions,and the structure of optimal control may be characterized.  相似文献
7.
1 IntroductionIn recent years5 the application of theories of functional differential equationsin mathematical ecology has been developed rapidIy. Various mathematicalmodels have been proposed in the study of population dynarnics, ecology andepidemic. Some of them are described as non-autonomous delay differentialequations. Many authors studied the dynamics of population with deIays whichis usefuI for the control of the population of the mankind, animals and theenvironment. One of the famous…  相似文献
8.
For a class of mixed initial-boundary value problem for general quasilinear hyperbolic sys-tems with zero eigenvalues, the authors establish the local exact controllability with boundary controls acting on one end or on two ends and internai controls acting on a part of equations in the system.  相似文献
9.
With the help of a continuation theorem based on Gaines and Mawhin's coincidence degree, sufficient conditions are established for the existence of periodic solutions of a class of discrete differential system with delays and feedback control.  相似文献
10.
With great developments of 8cience and technology exten8ion of system scale and variousapplication of computer, control 8ystem become expansive and sophisticated in the structureproperty About the stable questions of the delny type and the delay neutral type continuouscontrol sy8tem, many good result8 bave been establi8hed by many authors, but we seldom 8eethe studying of the unconditional stability problem for the hyperneutral type. In this paper,applying to the frequency domain method and th…  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号