全文获取类型
收费全文 | 241篇 |
免费 | 20篇 |
国内免费 | 18篇 |
专业分类
力学 | 16篇 |
综合类 | 4篇 |
数学 | 259篇 |
出版年
2024年 | 2篇 |
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 7篇 |
2015年 | 2篇 |
2014年 | 10篇 |
2013年 | 27篇 |
2012年 | 6篇 |
2011年 | 12篇 |
2010年 | 14篇 |
2009年 | 12篇 |
2008年 | 13篇 |
2007年 | 20篇 |
2006年 | 16篇 |
2005年 | 16篇 |
2004年 | 8篇 |
2003年 | 20篇 |
2002年 | 17篇 |
2001年 | 18篇 |
2000年 | 12篇 |
1999年 | 4篇 |
1998年 | 9篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 5篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1990年 | 1篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有279条查询结果,搜索用时 312 毫秒
111.
Consider the nonautonomous logistic modelwhere {pn} is a sequence of positive real numbers, {kn} is a sequence of non-negative integers satisfying We obtainnew sufficient conditions for the attractivity of the equilibrium x = x of the model. Our results improve ones which were established by Gapalsamy and Ladas recently, and solve some research projects posed by Kocic and Ladas in [7]. 相似文献
112.
非自治阶段结构捕食系统的持续生存 总被引:4,自引:0,他引:4
研究了非自治阶段结构捕食幼年系统解的持久性,得到了该系统持续生存和全局吸引的条件。 相似文献
113.
By using comparison theorem and constructing suitable Lyapunov functional, we study the following almost periodic nonlinear N-species competitive Lotka-Volterra model:
114.
运用脉冲时滞微分方程的比较理论,频闪映射和一些分析方法,讨论了一类捕食者具有脉冲扩散、食饵具有阶段结构的捕食-食饵模型得到了成熟食饵灭绝周期解的全局吸引和系统持久的充分条件,证明了系统的所有解是一致完全有界的.最后通过举例并进行数值模拟说明所得结果的正确性. 相似文献
115.
M. R. S. Kulenović S. Moranjkić Z. Nurkanović 《Mathematical Methods in the Applied Sciences》2016,39(10):2696-2715
T. Wanner We investigate global dynamics of the equation where the parameters b,c, and f are nonnegative numbers with condition b + c > 0,f ≠ 0 and the initial conditions x?1,x0 are arbitrary nonnegative numbers such that x?1+x0>0. We obtain precise characterization of basins of attraction of all attractors of this equation and describe the dynamics in terms of bifurcations of period‐two solutions. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
116.
The dynamical behavior of a predator–prey system with Gompertz growth function and impulsive dispersal of prey between two patches
下载免费PDF全文
![点击此处可从《Mathematical Methods in the Applied Sciences》网站下载免费的PDF全文](/ch/ext_images/free.gif)
In this paper, we investigate a predator–prey model with Gompertz growth function and impulsive dispersal of prey between two patches. Using the dynamical properties of single‐species model with impulsive dispersal in two patches and comparison principle of impulsive differential equations, necessary and sufficient criteria on global attractivity of predator‐extinction periodic solution and permanence are established. Finally, a numerical example is given to illustrate the theoretical results. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
117.
In this paper, a Volterra model with mutual interference and Beddington-DeAngelis functional response is investigated, some sufficient conditions which guarantee the existence and global attractivity of positive periodic solution for the system are obtained. Furthermore, our results improve the main results of paper [1]. 相似文献
118.
In this paper, we formulate a robust prey-dependent consumption predator-prey model with a delay of digestion and impulsive perturbation on the prey. Using the discrete dynamical system determined by the stroboscopic map, we obtain a ‘predator-eradication’ periodic solution and show that the ‘predator-eradication’ periodic solution is globally attractive when harvesting for the prey is over certain value. Using a new qualitative analysis method for impulsive and delay differential equations, we prove the system is uniformly persistent when harvesting for the prey is under certain value. Further, we show the delay of digestion is a “profitless” time delay. Moreover, we show our theoretical results by numerical simulation. In this paper, the main feature is that we introduce a delay of digestion and impulsive effects into the predator-prey model and exhibit a new mathematical method which is applied to investigate the system which is governed by both impulsive and delay differential equations. 相似文献
119.
A nonautonomous eco-epidemic model with disease in the prey is formulated and studied. Some sufficient and necessary conditions on the permanence and extinction of the infective prey are established by introducing the new research method. Some sufficient conditions on the global attractivity of the model are presented by constructing a Lyapunov function. Finally, an example is given to show that the periodic model is global attractivity if the infective prey is permanent. 相似文献
120.