Agricultural Systems Mathematical Models
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. TIME AVAILABLE FOR SPRAYING AND MECHANIZED SOWING IN THE NORTHEAST OF THE STATE OF MATO GROSSO DO SUL AND SOUTH OF GOIÁS
ABSTRACT The sizing of mechanized agricultural systems depends on the soil and climatic conditions, the crop and the work regime. The aim of this study was to determine the probabilities of time available during an agricultural year for mechanized spraying and sowing in the northeast region of the State of Mato Grosso do Sul and south of Goiás. The meteorol
Eng. Agríc.. Publicado em: 2018-06
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2. Linear Programming in the economic estimate of livestock-crop integration: application to a Brazilian dairy farm
ABSTRACT A linear programming mathematical model was applied to a representative dairy farm located in Brazil. The results showed that optimization models are relevant tools to assist in the planning and management of agricultural production, as well as to assist in estimating potential gains from the use of integrated systems. Diversification was a necessar
R. Bras. Zootec.. Publicado em: 2016-04
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3. Models of protein and amino acid requirements for cattle
Protein supply and requirements by ruminants have been studied for more than a century. These studies led to the accumulation of lots of scientific information about digestion and metabolism of protein by ruminants as well as the characterization of the dietary protein in order to maximize animal performance. During the 1980s and 1990s, when computers became
R. Bras. Zootec.. Publicado em: 2015-03
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4. Decision support bioeconomic model for livestock systems / Modelo bioeconômico para suporte à decisão em sistemas pecuários
Rural managers make decisions in uncertain and dynamic environments. These characteristics, associated with bounded rationality can lead to the formulation of mental models that reflect reality in a distorted way. In this context, the procedures for modeling and simulation are important tools to understand how the production systems operate and to make decis
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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5. Fuzzy set in the evaluation of the conservation state of the land use systems in the Occidental Amazonia, using beetles (Scarabaeidae) as bioindicators. / Conjuntos Fuzzy na avaliaÃÃo do estado de conservaÃÃo de sistemas de uso da terra na AmazÃnia Ocidental, usando besouros (Scarabaeidae) como bioindicadores
Currently the land is losing species much more quickly than it was some decades ago, and the human being is the main causer of this extinguishing. Biodiversity is in the basis of all survival human being, therefore it is indispensable to keep the evolution processes of the alive world acting in the regulation of the great physico-chemical equilibrium of the
Publicado em: 2007
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6. Kinetics of helminth eggs inactivation in water and digested sludges by saturated steam produced with methane from anaerobic digestors. / Inativação térmica de ovos de helmintos em água e em biossólidos digeridos: cinética em reator batelada e modelagem matemática em reator tubular.
Biological sludge can be a valuable resource for agricultural soil conditioning. However, an important obstacle for its use is the usual presence of pathogenic organisms, capable of disease dissemination. The main occurring pathogens are virus, bacteria, protozoa and helminth. Helminth eggs are very resistant to thermal inactivation. The Ascaris lumbricoids
Publicado em: 2006
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7. Sustainability of farming systems: an analysis in the context of agrodiversidade a case study in the eastern Amazon / Sustentabilidade dos sistemas agrícolas: uma análise no contexto da agrodiversidade um estudo de caso na Amazônia Oriental
O estudo tem como objetivo avaliar o processo de sustentabilidade em sistemas agrícolas, tendo como parâmetros os fluxos energético e econômico dentre seus compartimentos, cuja dinâmica é regida pela agrodiversidade de um ambiente agrário em transição. O trabalho de campo foi realizado no município de Igarapé-Açu, Nordeste do Pará. Inicialmente
Publicado em: 2005
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8. Avaliação de modelos matemáticos desenvolvidos para auxiliar a tomada de decisão em sistemas de produção de ruminantes em pastagens. / Evaluation of mathematical models developed to aid decision-making in pasture-based ruminant production systems.
In agricultural systems, environment, soil, animals and plants are indissociable components of the production process. Furthermore, the production time-frame is relatively long. These characteristics enhance risk and uncertainty associated with decision alternatives made during the process. One tool which can aid in decision-making in these processes is the
Publicado em: 2003
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9. Determinação e quantificação de fatores de influência sobre a produtividade de "Harvesters" na colheita de madeira. / Quantification and determination of influency factors over harvesters productivity on logging.
The Brazilian cellulose and paper industry has been total sales of US$ 7.5 billions on 2000, with consume of 14 millions of m3 of eucalypt wood. Logging and wood transportation are responsible for 50% of final cost of wood. On cut-to-length system, the harvester is the main machine used on felling and processing of wood. This is an equipment with high cost a
Publicado em: 2002