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 Spring, 2020: in the midst of on-line courses, due to the pandemic of Covid-19.      With the onset of the Covid-19 coronavirus crisis, we focus on SIRD models, which might realistically model the course of the disease.     We start with an SIR model, such as that featured in the MAA model featured
Spring, 2020: in the midst of on-line courses, due to the pandemic of Covid-19.

With the onset of the Covid-19 coronavirus crisis, we focus on SIRD models, which might realistically model the course of the disease.

We start with an SIR model, such as that featured in the MAA model featured in

Without mortality, with time measured in days, with infection rate 1/2, recovery rate 1/3, and initial infectious population I_0=1.27x10-4, we reproduce their figure

With a death rate of .005 (one two-hundredth of the infected per day), an infectivity rate of 0.5, and a recovery rate of .145 or so (takes about a week to recover), we get some pretty significant losses -- about 3.2% of the total population.

Resources:
  The bathtub problem exemplifies the archetype of goal seeking, where the stock behavior is determined by the interaction of the inbound and outbound flows.   -----------    O problema da banheira exemplifica o arquétipo da busca de objetivos, onde o comportamento do estoque é determinado pela inte
 The bathtub problem exemplifies the archetype of goal seeking, where the stock behavior is determined by the interaction of the inbound and outbound flows.
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 O problema da banheira exemplifica o arquétipo da busca de objetivos, onde o comportamento do estoque é determinado pela interação dos fluxos de entrada e saída.

http://web.mit.edu/jsterman/www/Bathtub.pdf
La situación modelada expresa el crecimiento de las ventas impulsadas por la motivación y productividad, pero es frenada por el tamaño del nicho de mercado.
La situación modelada expresa el crecimiento de las ventas impulsadas por la motivación y productividad, pero es frenada por el tamaño del nicho de mercado.
World Dynamics developed by Jay Forrester (1971) is one of the classic system dynamics models. It is an important model because it has been the basis of the controversial and widely-debated world models used in the Club of Rome's report, also known as Limits to Growth (Meadows et al., 1972; Randers,
World Dynamics developed by Jay Forrester (1971) is one of the classic system dynamics models. It is an important model because it has been the basis of the controversial and widely-debated world models used in the Club of Rome's report, also known as Limits to Growth (Meadows et al., 1972; Randers, 2004). 
The limits to growth structure is based on the basic growth structure. And, as should be obvious, nothing grows forever as growth requires resources. Those required resources become a limits to growth. See also  Archetypes .   Video   This model is part of   And? Understanding Relationships & Th
The limits to growth structure is based on the basic growth structure. And, as should be obvious, nothing grows forever as growth requires resources. Those required resources become a limits to growth. See also Archetypes.
60 8 months ago