Editorial: ``...to see it as it is...to know it as it isn't...''
Simple electrostatic model of the structural phase transition
A purely classical system of four equal point charges q which are free to move over the surface of a sphere is considered. In the equilibrium configuration all charges are located at the vertices of t...
A purely classical system of four equal point charges q which are free to move over the surface of a sphere is considered. In the equilibrium configuration all charges are located at the vertices of t...
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Sustained availability: A management program for nonrenewable resources
American Journal of Physics -- May 1986 -- Volume 54, Issue 5, pp. 398-402
Issue Date: May 1986
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The continued extraction from the earth of nonrenewable mineral and fuel resources is a cause for concern, particularly where the rates of extraction are growing. If the rate of extraction declines a fixed fraction per unit time, the rate of extraction will approach zero, but the integrated total of the extracted resource between t=0 and t=![[infinity]](http://scitation.aip.org/stockgif2/infin.gif)
will remain finite. If we choose a rate of decline of the rate of extraction of the resource such that the integrated total of all future extraction equals the present size of the remaining resource then we have a program which will allow the resource to be available in declining amounts for use forever. This program is called Sustained Availability (SA) and it is somewhat analogous to the program of ``sustained yield'' in the management of renewable resources such as agriculture. The mathematics of this program, the opportunities it presents, and its consequences are examined in detail.
©1986 American Association of Physics Teachers
will remain finite. If we choose a rate of decline of the rate of extraction of the resource such that the integrated total of all future extraction equals the present size of the remaining resource then we have a program which will allow the resource to be available in declining amounts for use forever. This program is called Sustained Availability (SA) and it is somewhat analogous to the program of ``sustained yield'' in the management of renewable resources such as agriculture. The mathematics of this program, the opportunities it presents, and its consequences are examined in detail.
©1986 American Association of Physics Teachers
| History: | Received 25 February 1985; accepted 31 May 1985 |
| Permalink: | http://dx.doi.org/10.1119/1.14600 |
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