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| Registros recuperados: 59 | |
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| Jesús Lozano, Luis. |
| El objetivo de este estudio fue determinar un patrón óptimo de cultivos en el sector agrícola de la Comarca Lagunera considerando de manera simultánea la maximización de la ganancia y la minimización del consumo de agua, dos criterios de optimización usualmente en conflicto. Se formularon dos modelos, uno de programación lineal para replicar el patrón actual de cultivos como base de referencia en el análisis comparativo, y un segundo modelo de programación compromiso que considera de manera simultánea los objetivos en conflicto. Los resultados indican que una estructura productiva más eficiente que la actual, debería considerar el aumento de la superficie de hortalizas ya que estos cultivos consumen sólo el 5% del recurso agua, pero aportan 21% del... |
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Palavras-chave: Productividad del agua; Programación lineal; Programación compromiso; Water productivity; Linear programming; Compromise programming; Maestría; Economía. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/691 |
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| Balogh, Peter; Ertsey, Imre; Fenyves, Veronika; Nagy, Lajos. |
| In many ways, the Hungarian pork chain faces considerable disadvantages when compared to the situation in competing countries. In countries endowed with a modern meat chain, heavy concentration is the rule, but in Hungary decentralization still prevails, although thankfully the chain is not disintegrating even further. In our research we used the operation of co-operatives as a model in terms of a generalized network problem. The model allows the quantification of the number of pigs from given farms to slaughterhouses, the maximum sales revenue, the delivery threshold prices, and an analysis of the impact co-operative members exert on sales revenues. |
| Tipo: Journal Article |
Palavras-chave: Pork production; Integration; Network; Linear programming; Demand and Price Analysis; Farm Management; Livestock Production/Industries; Research Methods/ Statistical Methods. |
| Ano: 2009 |
URL: http://purl.umn.edu/49192 |
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| Wachenheim, Cheryl J.; Novak, Patrick J.; DeVuyst, Eric A.; Lambert, David K.. |
| Co-products of processing agricultural commodities are often marketed through private transaction rather than through public markets or those in which public transaction information is recorded or available. The resulting lack of historical price information prohibits the use of positive time series techniques to estimate demand. Demand estimates for co-products are of value to both livestock producers, who obtain them for use in livestock rations, and processors, who must sell or otherwise dispose of them. Linear programming has long been used, first by researchers and later as a mainstream tool for nutritionists and producers, to formulate least-cost livestock rations. Here it is used as a normative technique to estimate step function demand... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Co-products; Demand estimation; Econometrics; Linear programming; Agribusiness. |
| Ano: 2001 |
URL: http://purl.umn.edu/23488 |
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| Schrijver, R.A.M.; Berentsen, Paul B.M.; Groeneveld, Rolf A.; Corporaal, A.; de Koeijer, T.J.. |
| ‘Farming for Nature’, a relatively new policy instrument being tried out in the Netherlands, is evaluated. The concept has been designed to allow dairy farmers to improve nature conservation on their farms. Under the scheme, no manure, fertilizer, or feed – concentrates or roughage - may be imported into farm systems from external sources. The feasibility of such a self-sustaining system and the conditions required for it to deliver the desired results, are explored with a farm-based linear programming model known as FIONA (Farm based Integrated Optimization Model for Nature and Agriculture). The model is explained and applied to ‘de Langstraat’, a region in southern Netherlands. The results show that levels of production under the ‘Farming for Nature’... |
| Tipo: Journal Article |
Palavras-chave: Nature management; Dairy farming system; Linear programming; Farm-economics; Farm Management; Land Economics/Use. |
| Ano: 2006 |
URL: http://purl.umn.edu/97194 |
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| Ebrahimi, Sajjad; Mesri Gundoshmian, Tarahom; Abdi, Reza; Raei Jadidi, Mehri. |
| The goal of this study was to evaluate the sustainability and efficiency of broiler production with regard to energy consumption in Ardabil province, Iran. To reach the goal, linear programming model and Data Envelopment Analysis (DEA) were employed. Data were collected from the farmers using a face–to–face questionnaire performed in September–December 2014 period. The DEA application results showed that the average values of technical, pure technical and scale efficiency scores of producers were 0.949, 0.988 and 0.960, respectively. Also, energy saving target ratio for broiler production was calculated as 8.33%, indicating that by following the recommendations resulted from this study, about 12316.85 MJ/(1000 bird) of total input energy could be saved... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy efficiency; Data Envelopment Analysis; Linear programming; Technical efficiency; Broiler. |
| Ano: 2016 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3562 |
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| Meneghini,Rafael Cedric Möller; Cassoli,Laerte Dagher; Martines Filho,João Gomes; Xavier,Carlos Eduardo Osório; Santos,Marcos Veiga dos; Caixeta Filho,José Vicente; Natel,Andressa Santanna; Machado,Paulo Fernando. |
| ABSTRACT The current pricing process of raw milk in Brazil discourages producers from improving milk composition, which affects both yield and quality of dairy products. Furthermore, small and medium-sized dairies face great difficulties when it comes to planning production. Thus, a linear programming model was developed to price the raw milk and determine the optimal mix (combination of quantities) of dairy products that maximizes total contribution margin (TCM) under daily scenarios of high (January) and low (July) raw milk supplies (summer and winter, respectively) by comparing optimal solutions with actual results. The TCM of optimal and actual mixes were higher in January due to the greater availability of raw material. Packaging was a limiting factor... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Contribution margin; Dairy products; Linear programming; Milk components; Milk pricing. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100051 |
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| Registros recuperados: 59 | |
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