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A logistic function is used to characterize peak and ultimate production of global crude oil and petroleum-derived liquid fuels. Annual oil production data were incrementally summed to construct a logistic curve in its initial phase. Using a curve-fitting approach, a population-growth logistic function was applied to complete the cumulative production curve. The simulated curve was then deconstructed into a set of annual oil production data producing an “idealized” Hubbert curve. An idealized Hubbert curve (IHC) is defined as having properties of production data resulting from a constant growth-rate under fixed resource limits. An IHC represents a potential production curve constructed from cumulative production...
A logistic function is used to characterize peak and ultimate production of global crude oil and petroleum-derived liquid fuels. Annual oil production data were incrementally summed to construct a logistic curve in its initial phase. Using a curve-fitting approach, a population-growth logistic function was applied to complete the cumulative production curve. The simulated curve was then deconstructed into a set of annual oil production data producing an “idealized” Hubbert curve. An idealized Hubbert curve (IHC) is defined as having properties of production data resulting from a constant growth-rate under fixed resource limits. An IHC represents a potential production curve constructed from cumulative production...
Increasing demand for renewable fuel sources has stimulated the need for alternative biomass crops. A study was conducted to determine grain, stover, total biomass, and estimated ethanol yields of annual and perennial crops at two locations in Kansas in 2007 and 2008. This study included corn (Zea mays L.) grown continuously and rotated with soybean [Glycine max (L.) Merr]; five sorghum cultivars, brown midrib (bmr), photoperiod sensitive, sweet, and two dual-purpose forage varieties; and three perennial warm-season grasses, switchgrass (Panicum virgatum L.), big bluestem (Andropogon gerardu Vitman), and Miscanthus (Miscanthus X giganteus). Corn and sorghum plants were harvested for grain and biomass and sweet sorghum...
A logistic function is used to characterize peak and ultimate production of global crude oil and petroleum-derived liquid fuels. Annual oil production data were incrementally summed to construct a logistic curve in its initial phase. Using a curve-fitting approach, a population-growth logistic function was applied to complete the cumulative production curve. The simulated curve was then deconstructed into a set of annual oil production data producing an “idealized” Hubbert curve. An idealized Hubbert curve (IHC) is defined as having properties of production data resulting from a constant growth-rate under fixed resource limits. An IHC represents a potential production curve constructed from cumulative production...