Results 251 to 260 of about 6,961,451 (296)

Effective population size of a population with stochastically varying size

Journal of Mathematical Biology, 2009
For a Wright-Fisher model with mutation whose population size fluctuates stochastically from generation to generation, a heterozygosity effective population size is defined by means of the equilibrium average heterozygosity of the population. It is shown that this effective population size is equal to the harmonic mean of population size if and only if
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Optimum Population Size

2022
AbstractRecent years have seen a surge in concern about overpopulation. The basic thought is that the planet's capacity to provide food, water, energy, materials, and simple living space, in addition to current artificial infrastructure, is being stretched far beyond optimum usage by the sheer number of people currently alive.
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Phoneme inventory size and population size

Language, 2007
This short report investigates the relationship between population size and phoneme inventory size, and finds a surprisingly robust correlation between the two. The more speakers a language has, the bigger its phoneme inventory is likely to be. We show that this holds for both vowel inventories and consonant inventories.
Jennifer Hay, Laurie Bauer
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Population size and environmental quality

Journal of Population Economics, 1997
This paper presents a simple general equilibrium analysis of first best allocations in an economy where a consumption good is produced using labor. Production results in pollution, which is a public bad. Pollution abatement can be achieved either by restricting production or by using additional labor.
Till Requate, Mark B. Cronshaw
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Population Density and Group Size

American Journal of Sociology, 1972
This study looks at the relationship between the size of the small interacting group (in numbers of persons) and its environment in this case, the density of its immediate population. We hypothesized that persons in more densely populated areas will gather for social interaction in smaller groups, in fewer bisexual groups.
J, Tucker, S T, Friedman
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Size Distributions of Sedimentary Populations

Science, 1963
Separate sedimentary populations are not all characterized by lognormal size distributions. Populations of different sizes of material are produced by different mechanisms of abrasion: pebbles and gravel by single-stage crushing; sand by repeated abrasion; and silt and clay by chipping from larger grains.
J J, Rogers, C, Schubert
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Environmental Fluctuations and Population Size

Nature, 1971
BOROWSKY has analysed the magnitude and pattern of the temporal fluctuations of experimental populations of Drosophila1, and has shown that the fluctuations are not randomly distributed in their direction; the frequencies of the competing species change in the same direction (upwards or downwards) more frequently than would be expected by chance alone.
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Magnetic resonance linear accelerator technology and adaptive radiation therapy: An overview for clinicians

Ca-A Cancer Journal for Clinicians, 2022
William A Hal, X Allen Li, Daniel A Low
exaly  

Optimal Population Size

Abstract There are any number of possible population sizes, from zero (human extinction) to a population so large that people live barely-worth-living lives (the repugnant conclusion). This chapter argues that contractualist reasoning can explain why the repugnant conclusion ought to be rejected.
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Population Size

1976
Henry S. Shryock, Jacob S. Siegel
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