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Description:A system of this type uses two energy sources, one renewable, the other nonrenewable. When the nonrenewable source is used up, the growth declines back to a steady state based on the renewable source. Examples: |
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Variables:N = nonrenewable energy sourceJ = steady inflow of energy Q = stored biomass K*JR*Q = part of J that goes into the system K3 = increasing factor of Q K7 = increasing factor of Q K8 = decreasing factor of Q Equations:DN = -K4*N*QJR = J/(1 + K*Q) DQ = K7*N*Q + K3*JR*Q - K8*Q Simulation:The graph shows the changes of N (red) and Q (green) over a time period.Source code: Twosource.java |
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"What if" Experiments:Think about the renewable and nonrenewable sources of our economy: |