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	Provedor de dados AgEcon (7) Autor Fragoso, Rui Manuel de Sousa (7) Martins, Maria de Belem Costa Freitas (3) Carvalho, Maria Leonor da Silva (2) Henriques, Pedro Damiao de Sousa (2) Ventura-Lucas, Maria Raquel (2) Xavier, Antonio (2) Godinho, Maria de Lurdes Ferro (1) Lucas, Raquel (1) Marques, Carlos (1) Mais... Palavra-chave Agribusiness (3) Agricultural supply (2) Alentejo (2) Positive mathematical programming (2) Research Methods/ Statistical Methods (2) Agri-environmental Policies (1) Agricultural and Food Policy (1) Agricultural policies (1) Algarve (1) Bio-economic Model (1) C11 (1) C81 (1) CAP (1) Calibration (1) Calibração (1) Common Agricultural Policy. (1) Competitiveness (1) Conservation Farming Technologies (1) Data disaggregation (1) Environmental Economics and Policy (1) Mais... Tipo do documento Conference Paper or Presentation (5) Journal Article (2) Ano 2011 (3) 2009 (1) 2008 (2) 2002 (1) País United States (7) Idioma Inglês (6) Português (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 7 Primeira ... 1 ... Última Recovery of Incomplete Data of Statistical Livestock Number Applying an Entropy Approach AgEcon Xavier, Antonio; Martins, Maria de Belem Costa Freitas; Fragoso, Rui Manuel de Sousa. Tipo: Conference Paper or Presentation Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods. Ano: 2011 URL: http://purl.umn.edu/115790 A PROGRAMAÇÃO MATEMÁTICA POSITIVA COMO INSTRUMENTO DE CALIBRAÇÃO E PRESCRIÇÃO DOS MODELOS DE OFERTA AGRÍCOLA AgEcon Fragoso, Rui Manuel de Sousa; Carvalho, Maria Leonor da Silva; Henriques, Pedro Damiao de Sousa. Neste artigo avalia-se a capacidade de calibração e de prescrição de resultados de um modelo de oferta agrícola da Região Alentejo. A capacidade de calibração é analisada para o regime de preços e de ajudas agrícolas em vigor no ano 2000, comparando os resultados de diferentes formas de especificação da função dos custos variáveis totais do modelo de programação matemática positiva com os resultados do modelo tradicional de programação linear e com os dados estatísticos observados. Depois de calibrado, o modelo de programação matemática positiva foi utilizado na prescrição dos resultados relativos ao cenário de preços e ajudas em vigor no ano de 2004. Concluiu-se que a programação matemática positiva para além de ser um eficaz instrumento de calibração dos... Tipo: Conference Paper or Presentation Palavras-chave: Programação matemática positiva; Oferta agrícola; Calibração; Prescrição; Positive mathematical programming; Agricultural supply; Calibration; Prescription; Agribusiness. Ano: 2008 URL: http://purl.umn.edu/108610 Avaliação da competitividade da agricultura do Alentejo no âmbito do ecossistema Montado AgEcon Fragoso, Rui Manuel de Sousa; Lucas, Raquel. This paper makes a socio-economic evaluation of the “Montado” ecosystem in Alentejo. It is study the viability of the agricultural systems and the effects of agricultural policy in their competitiveness and sustainability. It is used a Policy Analysis Matrix to evaluate the agricultural systems competitiveness and their economic efficiency. The agricultural systems are classified concerning their contribution for the economic growth, in function of income levels and policy effects. Tipo: Journal Article Palavras-chave: “Montado”; Alentejo; Policy Analysis Matrix; Competitiveness; Common Agricultural Policy.; Agribusiness; Q11; Q12; Q18. Ano: 2009 URL: http://purl.umn.edu/60813 The Evolution of the Agri-Environmental Policies and Sustainable Agriculture AgEcon Ventura-Lucas, Maria Raquel; Godinho, Maria de Lurdes Ferro; Fragoso, Rui Manuel de Sousa. Sustainable agriculture implies the exploitation of natural resources now, without compromising the natural resources stocks for the future generations. In the context of the paper, agricultural sustainability takes place at the interface between agriculture and the environment. The focus is on the interplay between farming systems and agri-environmental policies. Agricultural policies have major impacts on soil and water quality and on bio-diversity. Support commodity price policies have lead to serious problems of water pollution; high levels of soil erosion; nitrate losses and lost of biodiversity. The semi decoupeted income support policies and the introduction of the agri-environmental schemes under the 1992 CAP reform were the first attempts to... Tipo: Conference Paper or Presentation Palavras-chave: Sustainability; Agri-environmental Policies; Bio-economic Model; Conservation Farming Technologies; Environmental Economics and Policy. Ano: 2002 URL: http://purl.umn.edu/24956 Positive Mathematical Programming: a Comparison of Different Specification Rules AgEcon Fragoso, Rui Manuel de Sousa; Carvalho, Maria Leonor da Silva; Henriques, Pedro Damiao de Sousa. In this paper, the prescriptive capacity of different types of positive mathematical programming models applied to the Alentejo agricultural sector is analysed. Model results are compared for 2000 and 2004 agricultural price and subsidies scenarios, regarding optimal combination of activities. Thus, it is tested, on one hand, models capacity to reproduce Alentejo agricultural sector behaviour, and by the other hand, their response and adjustment capacities to changes in prices and in agricultural policy. Tipo: Conference Paper or Presentation Palavras-chave: Positive mathematical programming; Agricultural supply; Alentejo; Research Methods/ Statistical Methods. Ano: 2008 URL: http://purl.umn.edu/44242 A minimum cross entropy model to generate disaggregated agricultural data at the local level AgEcon Xavier, Antonio; Martins, Maria de Belem Costa Freitas; Fragoso, Rui Manuel de Sousa. This work presents an entropy approach to disaggregate agricultural data at a local level. It comprises two different steps. In a first one, an information prior at disaggregated level based on experts’ opinions, available cartography of land use and biophysical data is created. In a second step, it’s used a minimum cross entropy process in order to manage these information inputs and to guaranty a solution compatible with all the different restrictions. The model was applied to the region of Algarve in the year of 1999, in order to disaggregate the data at the pixel and county level. Results show that the model was able to provide some satisfactory results since the estimated values obtained for the different areas revealed a good approximation to the... Tipo: Conference Paper or Presentation Palavras-chave: Minimum cross entropy; Data disaggregation; Local level; Algarve; Agricultural policies; Agricultural and Food Policy; C11; C81; Q15; R14. Ano: 2011 URL: http://purl.umn.edu/98991 PORTUGUESE AGRICULTURE AND ITS ROLE IN MULTIFUNCTIONAL RURAL DEVELOPMENT AgEcon Ventura-Lucas, Maria Raquel; Marques, Carlos; Martins, Maria de Belem Costa Freitas; Fragoso, Rui Manuel de Sousa. Paper aims to demonstrate the ability or inability of Portuguese agriculture to respond to changing economic conditions as well as societal expectations and demands. The main question is to know how the CAP’s evolutions through a policy with a double emphasis – on market orientation and competitiveness and on sustainability. Tipo: Journal Article Palavras-chave: CAP; Multifunctional rural development; Quality of life in rural areas; Agribusiness. Ano: 2011 URL: http://purl.umn.edu/104641 Registros recuperados: 7 Primeira ... 1 ... Última

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