Polysys

POLYSYS is an U.S. agricultural sector policy simulation model that includes national demand, regional supply, livestock, and aggregate income modules (De La Torre Ugarte, et al, 1998). POLYSYS is anchored to published baseline projections for the agricultural sector and simulates deviations from the baseline. In this study, a 2006 10-year United States Department of Agriculture (USDA) baseline for all crop prices, yields, and supplies (except hay) is used. This baseline, which runs through the...

Daniel De La Torre Ugarte Burton English Kim Jensen Chad Hellwinckel Jamey Menard and Brad Wilson

* Associate Professor, Professor, Professor, Research Associate, Research Associate and Programmer Analyst respectively. Department of Agricultural Economics, 310 Morgan Hall, 2621 Morgan Circle, The University of Tennessee, Knoxville, TN 37996, ph. 865-974-5005. Study funded in part by the Governors' Ethanol Coalition and the National Commission on Energy Policy. This study was undertaken to examine the impacts of expanded levels of ethanol and biodiesel production and to provide a better...

Meet Ethanol Demand

This situation, corn grain use for ethanol cannot fall below the previous year's use. This results in biomass filling all increases in ethanol production because it can produce ethanol cheaper than corn grain. Because ethanol is the dominant bioproduct that can use either biomass or corn grain, its feedstock allocation determines market prices. In instances where the iterative solution results in a price that brings in slightly more biomass than is necessary to fill ethanol demand, the excess...

Figure 2 Bioenergy Sources

In order to project the agricultural and economic impacts of expanded ethanol and biodiesel production, two models are employed. The POLYSYS model (De La Torre Ugarte and Ray, 2000 Ray et al, 1998a De La Torre Ugarte et al, 1998 Ray et al, 1998b) has the unique ability to provide annual estimates of changes in land use resulting from the demand generated by bioenergy industries, including changes in economic conditions that affect adjustment costs. While maintaining a long-term analytical...

Enzymatic Breakdown

We will begin by an overview of enzymatic breakdown. First let's try to define the overall technological problem of this pathway. Cellulose is a complex carbohydrate with hundreds of long molecular chains bound to each other. The cellulose is present in many agricultural materials. i.e. corn stover, wheat and rice straw, dedicated energy crops, wood and wood residues among others. The process of converting the cellulosic material to ethanol involves two key phases. The first phase is to break...

Pii Implan 341 Implan

IMPLAN employs a regional social accounting system and can be used to generate a set of balanced economic social accounts and multipliers MIG, 2006 . The social accounting system is an extension of input-output analysis1. The model uses regional purchase coefficients generated by econometric equations that predict local purchases based on a region's 1 Input-output I-O analysis, also know as inter-industry analysis, is the name given to an analytical work conducted by Wassily Leontief 1936 in...