General Model for On-line Emergy Analysis of Agricultural Systems
نویسندگان
چکیده
This paper proposes the construction of tables for emergy synthesis of agricultural systems using internet resources. The general model considered for these tables can be used for simple agricultural systems like chemical farming but also for complex systems as organic, agroecological and forestrycattle-agriculture systems. The construction of tables was possible due to a research on XML (extensible markup language) and XLST (extensible style-sheet language transformation) technologies. The XML documents were used to hold the data of the inputs resources, outputs products and additional data of farming systems. A XSLT file was used to process the data, calculate the emergy flows and indicators and to present the results as tables in browsers. Besides that, it was made an effort to recover Transformities values for agricultural inputs in emergy literature. The emergy analysis and its indicators consider the renewability fraction of materials and services from economy, the infrastructure used and its depreciation and the payment of loans. A dynamic web page was developed using the JSP (Java Server Pages), Struts Framework and MySQL Database. The web page permits users to modify the data (quantity of each resource used and the quantity of products and their chemical composition and price). The web page (“Emergy Table”) provides a powerful tool to obtain the emergy indicators of a farming system and to take decisions to improve its performance. In the next stage of this research the gas emissions and their capture will be considered.
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