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阶段结构模型
相关语句
  stage-structure model
     Control of Population Size and Stability Through Diffusion: a Stage-Structure Model
     具有扩散的阶段结构模型中种群数量和稳定性的控制(英文)
短句来源
     In the first part, a discrete single population stage-structure model is analysised. The stability of equilibria is studied and the permanence is proved.
     第一章建立并研究了离散的单种群阶段结构模型,讨论了平衡点的存在性和稳定性,证明了种群的持续生存。
短句来源
  “阶段结构模型”译为未确定词的双语例句
     STAGE-STRUCTURED MODEL OF A SINGLE-SPECIES WITH DENSITY-DEPENDENT BIRTH PULSES
     具有密度依赖的生育脉冲单种群阶段结构模型
短句来源
     Secondly, we further investigate an exploited single-species discrete population model with stage structure for the dynamics in a fish population for which birth occurs in a single pulse once per time period.
     接着,我们研究了一个具季节收获和生育脉冲的单种群离散阶段结构模型
短句来源
     In recent years ,much inspiring progress about ecological systems has been made ,while the study of the stage-structured Lotka-Volterra system that is more correspond with nature phenomenon and more practical significance ,has not been studied very much .
     近年来,对生态系统的研究已经取得了许多令人鼓舞的进展,而对于更符合自然现象、更具有实际意义的种群阶段结构模型,研究的尚不多见。
短句来源
     Water-borne polyurethane (WBPU) of self-emulsification was synthesized by diisocyanate, polyether, and dimethylol propionic acid (DMPA). Changes in some of its physical and chemical properties (viscosity and conductivity) in the emulsification process were used to study its phase transition process. Further more, a three-stage structure model (TSSM) was used to model phase transition process of WBPU.
     以二异氰酸酯、聚醚二元醇和二羟甲基丙酸(DMPA)合成了自乳化型水性聚氨酯(WBPU),利用其在乳化过程中一些物化性质———电导率和粘度的改变,研究了它的相转变过程,并建立了三阶段结构模型(TSSM),对相转变过程进行模拟.
短句来源
     The following conclusions have been obtained: The point of phase transition of WBPU is (0.175) (ratio of weights between water and oil). Phase transition process can be divided into three stages. It is reasonable to model the phase transition process of WBPU with TSSM.
     结果显示:自乳化型水性聚氨酯的相转变点发生在水油比为0.175左右,相转变过程分为三个阶段,可以用三阶段结构模型对相转变过程进行模拟.
短句来源
  相似匹配句对
     The Models of Stage-Structured Population Dynamics
     阶段结构种群动力学模型
短句来源
     A Discrete Epidemical Model with Stage Structure
     离散的阶段结构传染病模型
短句来源
     Analysis of the Stage-Structure Model with Time-delay and Diffusion
     阶段结构时滞扩散模型分析
短句来源
     The Epidemic Model with Two-Stage Strunture
     具有阶段结构的SIS传染病模型
短句来源
     A SI EPIDEMIC MODEL WITH TWO-STAGE STRUCTURE
     具有阶段结构的SI传染病模型
短句来源
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Water-borne polyurethane (WBPU) of self-emulsification was synthesized by diisocyanate, polyether, and dimethylol propionic acid (DMPA). Changes in some of its physical and chemical properties (viscosity and conductivity) in the emulsification process were used to study its phase transition process. Further more, a three-stage structure model (TSSM) was used to model phase transition process of WBPU. The following conclusions have been obtained: The point of phase transition of WBPU is (0.175) (ratio of weights...

Water-borne polyurethane (WBPU) of self-emulsification was synthesized by diisocyanate, polyether, and dimethylol propionic acid (DMPA). Changes in some of its physical and chemical properties (viscosity and conductivity) in the emulsification process were used to study its phase transition process. Further more, a three-stage structure model (TSSM) was used to model phase transition process of WBPU. The following conclusions have been obtained: The point of phase transition of WBPU is (0.175) (ratio of weights between water and oil). Phase transition process can be divided into three stages. It is reasonable to model the phase transition process of WBPU with TSSM. The phase transition process is affected by the content of carboxyl, different molecular weight of polyether, and the value of R. When the content of carboxyl is approximately 1.4 wt%, perfect properties of water-borne polyurethane can be obtained. The value of NCO/OH (R) should be selected according to specific situations.

以二异氰酸酯、聚醚二元醇和二羟甲基丙酸(DMPA)合成了自乳化型水性聚氨酯(WBPU),利用其在乳化过程中一些物化性质———电导率和粘度的改变,研究了它的相转变过程,并建立了三阶段结构模型(TSSM),对相转变过程进行模拟.结果显示:自乳化型水性聚氨酯的相转变点发生在水油比为0.175左右,相转变过程分为三个阶段,可以用三阶段结构模型对相转变过程进行模拟.羧基含量、不同分子量的聚醚、R值(NCO OH摩尔比),都会对相转变过程造成影响.羧基含量一般控制在1.4wt%左右较好,R值的大小则需根据实际要求选用,一般控制在0.95~1.0范围内.

In this paper,the asymptotic behavior of a structured SIS epidemic model with Logistic death rate is studied.Sufficient conditions for the existence and locally and globally asymptotic stability of the disease free equilibrium and endemic equilibrium are obtained.The threshold is found which the epidemic will become endemic or die out.

研究了一类具有Logistic死亡且成年染病的SIS阶段结构模型的渐近形态,讨论了无病平衡点和地方病平衡点的存在性及局部和全局稳定性,得出了疾病消除和成为地方病的阈值.

 
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