年龄结构

因此年龄结构是Size结构的一种特殊情形。

Consequently , age structure is only a special kind of size structure .

种群年龄结构为增长型，Q1、Q2种群年龄结构由增长型趋向稳定型。

In plot Q_1 and plot Q_2 the population age structure tends to be steady instead of developing .

具非线性传染率染病年龄结构SIR流行病模型渐近分析

An Asymptotic Analysis of an Infection-Age-Dependent SIR Epidemic Model with Nonlinear Infectivity

年龄结构SIR流行病传播数学模型渐近分析

Asymptotic Analysis of an Age - Dependent SIR Epidemic Model

一类有年龄结构的HIV传播动力学模型研究

An Age - structured Dynamic Model of HIV

具有年龄结构的SIS模型的研究

Study on SIS Model with Age Structure

广义LESLIE矩阵模型的稳定年龄结构及其性质

The stable age structure and its properties in generalized Leslie matrix model

具有年龄结构和无限时滞Lotka-Volterra型捕食者-食饵系统的持久性

Permanence of Lotka-Volterra type predator-prey system with stage structure and infinite delay

具有垂直传染的年龄结构SEIR流行病模型的稳定性

Stability of an age-structured SEIR epidemic model with vertical transmission

时变年龄结构的SEIR传染病模型解的存在性

Existence of Solution for the Time-varying Age-structured SEIR Epidemic Model

首先，建立了一类具有一般非线性接触率及隔离函数的染病年龄结构SIRS传染病模型。

An SIRS epidemic model with general nonlinear contact rate , general screening function and infection-age dependence is first formulated .

总人口规模变化的年龄结构SEIR流行病模型的稳定性

Stability of an age - structured SEIR epidemic model with varying population size

m-2，均呈增长型年龄结构。

The buds were also of increasing age structure .

具年龄结构的metapopulation的空间分布模型

A spatial distributed model with age-constructed metapopulation dynamics

应用Kish表入户抽样被访者年龄结构扭曲问题研究

Age Structure Distorted Problem of Applying Kish Table for the Household Interview

运用Leslie矩阵和Markov链建立了一个具年龄结构的集合种群随时间动态变化的空间分布模型，给出了集合种群持续存在以及灭绝的条件。

The spatial distributed models with age-constructed metapopulation dynamics are established by applying Leslie matrix and Markov chain . The conditions of sustainable existence and extinct of metapopulation are studied .

方法用酶联免疫分析法分析测定46例脑出血患者和21例性别、年龄结构相似的健康人血清NSE浓度。

Method Blood samples of46 patients with cerebral hemorrhage and21healthy donors were determined with a ELISA Neurological deficit scores were evaluated with Scandivia stroke scale ( SSS ) .

建立了一类新的带有脉冲接种的类年龄结构SEIR流行病模型，并考虑其具有非线性传染率。

In this paper , we establish a kind of new class age-structure SEIR epidemic model with impulsive vaccination and nonlinear infectivity , which contains ODEs and PDEs at the same time .

本文讨论了一类具有垂直传染的年龄结构SEIR流行病模型，运用有界线性算子半群理论证明了模型本身非负解的存在唯一性。

This paper discusses an age-structured SEIR epidemic model with vertical trans - mission . The existence and uniqueness of nonnegative solution to the model are proved by using the theory of bounded linear operator semigroup ;

我国渔业资源的评估多采用产量模型和年龄结构模型，对于Delay-difference模型和消耗模型的应用甚为少见。

Fish stock assessment models in China which are used widely are production models and age-structured models , the former are surplus production models in the most .

本文讨论带二次感染和接种疫苗的年龄结构MSEIR流行病模型。

In this paper , we discuss an age-structured MSEIR epidemic model with the loss of immunity and an age-dependent vaccination rate ψ( a ) .

通过分析和整理，得出以下结论：第一，CCC参赛车手的年龄结构较为合理，但在培养方式、专职化程度、文化素质等方面仍与欧美同类赛事的参赛车手存在较大的差距。

By analyzing and collating , come to the following conclusions : 1 . The age structure of the CCC racer is more reasonable , but there are big gap between our racer and Europe or America racer in training , full-time degree , and culture . 2 .

其中LCBP模型在考虑了经济收入水平、人口、年龄结构层次及流动人口流量等环境因子的条件下对趋势分量进行预测。

LCBP model predicts the weight of trend on terms that have considered such environmental factors as the economic income level , population , age composition level and flow of floating population , etc.

研究一类具有年龄结构的线性周期种群动力系统的最优收获控制问题，即讨论了具有周期的生死率和周期变化的收获项的Lotka-Mckendrick模型。

In this paper , an optimal harvesting problem for linear periodic age-dependent population dynamics is investigated . Namely , the Lotka-Mckendrick model with periodic vital rates and a periodic forcing term that sustains oscillations is considered .

年龄结构图显示，仙湖苏铁无性系种群为稳定种群，基株种群为衰退种群；

The age structure diagram showed that the clone population of C.

年龄结构不理想的竹林资产评估方法探讨

Approaching Capital Evaluation Method of Bamboo Forest without Idea Age Structure

专门人才队伍年龄结构和补充量的最优规划

Optimal planning for age structure and replenishment of specialized manpower contingent

具有年龄结构的接种流行病模型的稳定性

The Stability of an Age - structured Epidemic Model with Vaccination

一个非线性年龄结构种群模型正平衡解的全局稳定性

Global Stability of Positive Equilibrium of Nonlinear Age Structured Population Model

一类带年龄结构的扩散捕食系统的定性分析

Qualitative Analysis of a Class of Diffusive Predator-Prey Systems with Age-Structure