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population growth models
相关语句
  种群增长模型
     Feedback-Linearized Control of a Class of Population Growth Models
     一类种群增长模型的反馈线性化控制
短句来源
     Discusses the problem of the chaotic control of a class of population growth models with time lag.
     考虑一类带有时滞的种群增长模型的混沌控制问题.
短句来源
     Computing the Lyapunov exponents and Lyapunov dimension of the system,the fact that there is a chaos phenomenon in the population growth models with time lag is verified.
     通过计算系统的Lyapunov指数和Lyapunov维数验证了一类带有时滞的种群增长模型具有混沌现象.
短句来源
  “population growth models”译为未确定词的双语例句
     YIELD PROGRAM DESIGN AND OPTIMAL CULTIVATION FOR SOYBDAN I. SOYBEAN POPULATION GROWTH MODELS
     大豆产量程序设计及栽培措施优化的研究 第一报 大豆群体的生长模式
短句来源
     In the second chapter, based on a general form of two types of well known periodic delayed single-species population growth models, we establish multiple delays competitive system, predator-prey system and facultative mutualism in 2.1, 2.2 and 2.3, respectively.
     第二章我们基于两个典型的时滞单种群周期微分系统的—般形式,分别在2.1节、2.2节和2.3节建立了具有多个时滞的两种群周期竞争系统,捕食系统和互惠系统。 我们利用Mawhin连续性定理和Liapunov函数分别得到了上述三个系统正周期解存在且全局渐近稳定的充分条件。
短句来源
  相似匹配句对
     controlling population growth;
     控制人口增长 ;
短句来源
     controlling population growth;
     控制人口增长;
短句来源
     The growth of E.
     重组HBD 2对E.
短句来源
     Models for clonal growth of white clover population
     白三叶无性系植物种群生长模型的研究
短句来源
     STUDIES ON MATHEMATICAL MODELS OF POPULATION GROWTH IN CHINA
     关于三个人口学刊引文的统计分析
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  population growth models
Population growth models suggest that rotifers are not food limited in Lake Kinneret but that fish predation plays an important role in regulating abundance in spring-summer and fall.
      
Time delays produced by essential nonlinearity in population growth models
      
In this study we present a method for transforming observed patterns (notably how vital rates change with temperature) into functions that can be used in population growth models and analysis of population structure.
      
The purpose of this note is to discuss certain features of population growth models carlier proposed and to construct an alternative diffusion model for regulated growth in random environment.
      


With x(r)=population size, the nonautonomous equation x(r+1)=x(r)expf(r, x(r)) provides a very general description of population growth in which any of the many factors that influence the growth rate may vary through time. If there is some fixed length of time such that during any interval of this length the population experiences environmental variability representative of the variation that occurs in all time, then definite conclusions about the population's long term behavior...

With x(r)=population size, the nonautonomous equation x(r+1)=x(r)expf(r, x(r)) provides a very general description of population growth in which any of the many factors that influence the growth rate may vary through time. If there is some fixed length of time such that during any interval of this length the population experiences environmental variability representative of the variation that occurs in all time, then definite conclusions about the population's long term behavior apply. Specifically, conditions that produce population presistence can be distinguished from conditions that cause extinction. These attributes resemble corresponding features of the related autonomous population growth model x(τ+1)=x(r)expf(x(τ)).

本文考虑非自治离散时间单种群模型x(τ+1=一x(τ)expf(τ,x(τ)),其中x(τ)表示种群数量。这里影响种群生长速度的各种因素可以因时间而改变,如果存在某个长度固定的时间阶段,在任何这样长的时间阶段上,种群所经历的环境变化可以代表在所有时间出现的环境变化,那么我们可以得到种群生长的最终行为,即在什么条件下种群将持续不断的生存下去,又在什么条件下,种群灭绝。最后,对于自治系统x(τ+1)=x(τ)expf(x(τ))也相应地给出了种群持续生存及灭绝的条件。

In this Paper,authors have established a new population growth model by means of a gap-distributed delay,which is more realistic than the distributed delay models. The local stability of the equilibrium of this new model has been investigated in two kind of different methods, and the necessary and sufficient condition under which the equilibrium is asymptotically stable has been obtained. The Stable and instable regions on the parametric plane has been separated.

本文首先利用间隙分布时滞函数来建立更为符合实际的种群增长模型,然后运用两种不同的方法,对其平衡位置的局部稳定性进行了全面的讨论,得出了局部渐近稳定的充分必要条件,在参数平面上划分出了稳定和不稳地的区域。

In this paper, we discuss a delay population growth model and obtainsufficient conditions under which the equilibrum point is a global attractor or uniformlystable.The results obtained have not only extended some previous ones due to Sugie,but also solved a open problem proposed by Kuang.

本文考虑一个具有时滞的人口增长模型,得到保证其平衡点为全局吸引或一致稳定的若干充分条件,所得结果不仅推广了Sugie的新近结果,而且也解决了Kuang提出的一个公开问题.

 
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