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Related Concept Videos

Cell Migration01:09

Cell Migration

Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Population Growth00:57

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Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...
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Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

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Population dynamics can be described mathematically by considering the population size P(t) as a function of time. The rate of change of the population is then represented by the derivative of P(t). A simple assumption is that the rate of growth is proportional to the size of the population itself. This leads to an exponential growth model, where the population increases rapidly without bound. While this is a useful first approximation, it does not reflect realistic long-term...

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Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
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Published on: July 4, 2007

Development aspects of migration in third world settings: a simulation, with implications for urbanization.

L A Brown, F C Stetzer

    Environment & Planning A
    |December 1, 1984
    PubMed
    Summary

    This study simulates development and migration in developing nations, revealing how economic factors influence population shifts. Findings confirm earlier research on regional disparities and growth traps, highlighting urban size as a key factor.

    Keywords:
    Demographic FactorsDemographic TransitionDeveloping CountriesEconomic DevelopmentEconomic FactorsEconomic ModelGeographic FactorsMigrationModels, TheoreticalPopulationPopulation DynamicsResearch MethodologySocioeconomic FactorsSpatial DistributionUrban Spatial DistributionUrbanization

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    Area of Science:

    • Economics
    • Demography
    • Urban Studies

    Background:

    • Development and migration are complex, interconnected processes in developing countries.
    • Neoclassical development models often overlook long-term landscape evolution dynamics.
    • Understanding these interrelationships is crucial for sustainable growth strategies.

    Purpose of the Study:

    • To simulate the intricate relationship between socioeconomic development and migration patterns.
    • To explore the long-run implications of development on urban and regional landscapes.
    • To test established hypotheses regarding spatial economic phenomena.

    Main Methods:

    • A simulation model integrating demographic transition, employment, and communication channels.
    • Incorporation of neoclassical development principles with a focus on long-term effects.
    • Analysis of urban system evolution under varying conditions.

    Main Results:

    • Simulation outcomes align with theories of polarization reversal and converging regional disparities.
    • Identified low-level equilibrium traps in remote areas due to resource drain hindering agglomeration economies.
    • Initial urban configurations showed minimal impact on final spatial distributions.

    Conclusions:

    • Urban size diseconomies significantly influence the spatial characteristics of urban systems.
    • Sustained growth is contingent on overcoming resource drain and fostering agglomeration economies.
    • The model provides insights into long-term development and migration dynamics.