Results 211 to 220 of about 846,470 (266)

Types of Population Balance

American Sociological Review, 1955
SINCE at least 1929 it has been commonplace for demographers to use a threefold classification with which to categorize the world's populations.1 To use Notestein's descriptive titles for these, they are (1) Incipient Decline, (2) Transitional Growth, and (3) High Growth Potential.2 This mode of thinking assumes a series of related trends within both ...
Paul K. Hatt, Nellie Louise Farr, Eugene Weinstein   +2 more
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Exact solutions of population balance equation

Communications in Nonlinear Science and Numerical Simulation, 2016
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Fubiao Lin, Adrian E. Flood, Sergey V. Meleshko   +2 more
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A puristic analysis of population balance—II.

Chemical Engineering Science, 1973
Abstract This paper in sequel to an earlier paper by the authors [1] establishes that the population balance equation for any particulate system is only one of an infinite sequence of equations in product densities associated with the description of point processes.
D. Ramkrishna, J.D. Borwanker
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The Potential for Rural‐Urban Population Balance

Growth and Change, 1977
Pressure is building for a national policy on population distribution, with emphasis on stopping the involuntary migrations caused by a lack of employment opportunities and establishing an adequate work force to support employment growth. This study focuses on the rural-urban population balance and the relationship of job opportunities and labor force ...
W N, Musser, F C, White
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Population Balance Equations

2003
In Chapter 7, cell population balances are written in terms of a distribution of mass fractions of the total biomass. This allows a direct combination of intracellularly structured models and population models. However, the population balances based on mass fractions do not permit the incorporation into the model of specific events in the cell cycle ...
John Villadsen, Jens Nielsen, Gunnar Lidén   +2 more
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Speciation and the “shifting balance” in a continuous population

Theoretical Population Biology, 1987
Shifts between adaptive peaks, caused by sampling drift, are involved in both specification and adaptation via Wright's ''shifting balance''. We use techniques from statistical mechanics to calculate the rate of such transitions for a population in a single panmictic deme and for a population which is continuously distributed over one- and two ...
Rouhani, S., Barton, N.
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Spatially Balanced Sampling of Continuous Populations

Scandinavian Journal of Statistics, 2018
AbstractWhen sampling from a continuous population (or distribution), we often want a rather small sample due to some cost attached to processing the sample or to collecting information in the field. Moreover, a probability sample that allows for design‐based statistical inference is often desired.
Anton Grafström, Alina Matei
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The mutation–drift balance in spatially structured populations

Journal of Theoretical Biology, 2016
In finite populations the action of neutral mutations is balanced by genetic drift, leading to a stationary distribution of alleles that displays a transition between two different behaviors. For small mutation rates most individuals will carry the same allele at equilibrium, whereas for high mutation rates of the alleles will be randomly distributed ...
Schneider, David M., Martins, Ayana B., de Aguiar, Marcus A. M.   +2 more
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The Balance between Populations

1958
In the first part of this book I have described some of the successful invaders establishing themselves in a new land or sea, as a war correspondent might write a series of dispatches recounting the quiet infiltration of commando forces, the surprise attacks, the successive waves of later reinforcements after the first spearhead fails to get a foothold,
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Population Balance Modeling of Antibodies Aggregation Kinetics

The Journal of Physical Chemistry B, 2012
The aggregates morphology and the aggregation kinetics of a model monoclonal antibody under acidic conditions have been investigated. Growth occurs via irreversible cluster-cluster coagulation forming compact, fractal aggregates with fractal dimension of 2.6.
P. Arosio, S. Rima, M. Lattuada, MORBIDELLI, MASSIMO   +3 more
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