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| Registros recuperados: 223 | |
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| Mirzabe, Amir Hossein; Taheri, Mojtaba; Asaei, Habil; Kianmehr, Mohammad Hossein. |
| To design the planting, separating, threshing, sizing and packing machines for agricultural products, physical and mechanical properties of the products should be known. In this paper, some physical properties of red radish seeds were studied. Dimensional parameters, when moisture content equals to 5.65% based on dry bases (d.b), were measured using image processing technique. Effects of moisture content on gravimetrical and frictional properties of the seeds, including mass of single seed, 1000-unit seed, bulk density, true density, porosity, static coefficient of friction on various surfaces, and angle of repose based on pouring, Hele-Shaw, empting and filling methods were studied. Effects of volume of the container (150, 350, 550 and 750 mL) and height... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Image processing technique; Dimensional properties; Modeling; Moisture content; Gravimetrical properties; Frictional properties. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3406 |
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| Candelaria Martínez, Bernardino. |
| Se caracterizaron los agroecosistemas (AES) de la microcuenca Paso de Ovejas 1 (POV-1) y con base en las condiciones locales se diseñó un índice agregado de sustentabilidad, en el cual se incluyeron cuatro dimensiones: ambiental, económica, social y humana, con un total de 29 indicadores. Para determinar los valores umbrales (máximo y mínimo) de cada indicador se consideraron parámetros locales, de cada grupo se seleccionó un AES al azar al que se le denominó agroecosistema tipo, en el que se realizaron evaluaciones detalladas y se representó en un modelo de simulación. Los grupos (G) identificados fueron: G1) tendencia a la ganadería con alta disponibilidad de tierras, G2) tendencia al manejo de cultivos con baja disponibilidad de tierras y G3) tendencia... |
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Palavras-chave: Modelación; Modelos; Escenario; Indice agregado; Territorio; Modeling; Models; Scenario; Aggregation index; Territory; Agroecosistemas Tropicales; Doctorado. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/548 |
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| Cysneiros, Vinicius Costa; Amorim, Thiago de Azevedo; Mendonça Júnior, Joaquim de Oliveira; Gaui, Tatiana Dias; de Moraes, Juan Carlos Resende; Braz, Denise Monte; Machado, Sebastião do Amaral. |
| O objetivo do presente estudo foi avaliar o desempenho e selecionar funções densidade de probabilidade que descrevam a distribuição diamétrica da comunidade florestal e das três principais espécies da Floresta Ombrófila Densa no sul do estado do Rio de Janeiro. Foram testadas as funções Normal, Log Normal, Beta, Gama, Sb de Johnson e Weibull. Os ajustes foram realizados com auxílio da ferramenta Solver (MSExcel®), que utiliza o algoritmo linear de gradiente reduzido para otimização dos parâmetros das funções. Para a seleção do melhor modelo foram avaliados o valor D de Kolmogorov – Smirnov e o erro padrão da estimativa (Syx %). De maneira geral, as funções Sb de Johnson e Weibull apresentaram as melhores estatísticas de ajuste e maior precisão nas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Engenharia Florestal; Dendrometria Floresta Atlântica; Funções densidade de probabilidade; Modelagem Atlantic Forest; Density probability functions; Modeling. |
| Ano: 2017 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1070 |
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| Pezzopane,José Ricardo Macedo; Santos,Patricia Menezes; Mendonça,Fernando Campos; Araujo,Leandro Coelho de; Cruz,Pedro Gomes da. |
| The objective of this work was to develop and validate linear regression models to estimate the production of dry matter by Tanzania grass (Megathyrsus maximus, cultivar Tanzania) as a function of agrometeorological variables. For this purpose, data on the growth of this forage grass from 2000 to 2005, under dry‑field conditions in São Carlos, SP, Brazil, were correlated to the following climatic parameters: minimum and mean temperatures, degree‑days, and potential and actual evapotranspiration. Simple linear regressions were performed between agrometeorological variables (independent) and the dry matter accumulation rate (dependent). The estimates were validated with independent data obtained in São Carlos and Piracicaba, SP, Brazil. The best statistical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Panicum maximum; Climatic growth index; Degree‑days; Evapotranspiration; Modeling. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000400001 |
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| Mutuli, Gibson Peter; Mbuge, Duncan. |
| Thin layer drying of cowpea leaves (Vigna unguiculata) and jute mallow (Corchurus olitorious L) (African leafy vegetables) was studied at different temperatures (40oC -100oC) in a convective laboratory dryer. The study determined the drying characteristics of the vegetables, the maximum drying temperature and the drying energy requirements. Moisture content of the African leafy vegetables was determined on dry basis and the data were used to calculate moisture ratios and drying curves were plotted. The drying occurred in the falling rate period. The experimental data were fitted to fourteen thin layer drying models and the most appropriate drying model determined using correlation coefficient, mean square error and standard error of estimate. The model... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Africa leafy vegetables; Thin layer drying; Moisture content; Energy; Modeling. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3368 |
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| Sánchez-Román,Rodrigo Máximo; Folegatti,Marcos Vinicius; Orellana González,Alba María Guadalupe; Silva,Rogério Teixeira da. |
| The Piracicaba, Capivari and Jundiaí River Basins (RB-PCJ) are located in the States of Minas Gerais and São Paulo, Brazil. By 2005, 5.8% of Brazil's General National Product-GNP was produced there. Such economic development has created a huge demand for water resources. The availability of water resources was assessed by running a dynamic systems simulation model to manage these resources in the RB-PCJ (WRM-PCJ), considering five 50-year simulations. WRM-PCJ was developed as a tool to aid the RB-PCJ Watershed Committee. The model computes water supply, demands, and contamination load from several consumers. When considering a Business-as-Usual scenario, by 2054, water demands will have increased up to 76%, 39% of the available water will come from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water stress; Water management; Watershed; Modeling. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400001 |
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| Doyen, Luc; Cisse, Abdoul; Gourguet, Sophie; Mouysset, L.; Hardy, Pierre-yves; Bene, Christophe; Blanchard, Fabian; Jiguet, Frederic; Pereau, J.-c.; Thebaud, Olivier. |
| Terrestrial and marine biodiversity provides the basis for both ecosystems functioning and numerous commodities or services that underpin human well-being. From several decades, alarming trends have been reported worldwide for both biodiversity and ecosystem services. Therefore the sustainable management of biodiversity requires a double viewpoint balancing ecological conservation with the welfare of human societies. Understanding the underlying trade-offs, synergies and interactions imposes the development of interdisciplinary researches and methods. In that respect, bio-economic or ecological economic modeling is likely to play a major role. The present paper intends to elicit the key features, strengths and challenges of bio-economic approaches... |
| Tipo: Text |
Palavras-chave: Ecological economics; Modeling; Sustainability; Biodiversity; Public policy; Criterion; Equilibrium; Optimality; Viability. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00171/28208/26510.pdf |
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| Paarlberg, Philip L.; Lee, John G.; Seitzinger, Ann Hillberg. |
| The paper surveys articles examining the economic impacts of a livestock disease outbreak and focuses on modeling issues. One set of papers considers setting an import barrier when there is a livestock disease risk. They show that the level of a risk-based import barrier is sensitive to the impact of disease on economic welfare. The remaining articles focus on estimates of the economic impacts. An outbreak is modeled in a U.S. agricultural sector model and shows the importance of lost exports and consumer response to the magnitude of losses. The final paper argues for de-composition of the welfare impacts. Lessons for future research include improved links to epidemiological research, improved inclusion of trade, extension to non-agricultural sectors, and... |
| Tipo: Journal Article |
Palavras-chave: Foot-and-mouth disease; Modeling; Trade; Livestock Production/Industries. |
| Ano: 2005 |
URL: http://purl.umn.edu/8178 |
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| Tunde-Akintunde, Toyosi; Oyelade, Olusegun; Akintunde, Babatunde. |
| Abstract: The effect of air temperature (50°C, 60°C, 70°C, 80°C and 90°C) and pre-treatments (steam, water palm oil-water, groundnut oil-water blanching) on the drying characteristics and quality of bell pepper was investigated. The results were fitted to six thin-layer drying models and Parabolic model gave the best fit. The pretreated samples dried faster than untreated samples and had lower values of total energy needed and specific energy requirement. The ascorbic acid content, color and rehydration index varied from 129.1 to 316.8 mg/100 g dry matter, 0.1 to 0.9, 22 to 33 mL and pretreated dried pepper generally had higher values than untreated samples. Keywords: modeling, energy consumption, Rehydration index, color, pepper |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling; Energy consumption; Rehydration index; Color; Pepper. |
| Ano: 2014 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2741 |
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| Souza,Clitor Junior Fernandes de; Rojas,Edwin Elard Garcia. |
| This work characterizes the emulsifying properties of systems containing egg yolk (0.1; 1.0 and 2.5 % w/v) and polysaccharides (xanthan gum, carrageen, pectin and carboxymethylcellulose) and three different vegetable oils (sunflower, canola, and palm oils). Emulsifying activity and emulsion stability were measured of each combination and it was found the effect of the oil on emulsion stability correlated to the amount of monounsaturated fatty acid. Additionally, increased egg yolk concentration increased emulsifying activity by reducing coalescence of oil droplets. Lastly, 2.5% egg yolk and 0.2% polysaccharide generated emulsions with high emulsifying activity, excellent stability, and droplet size of 4.32 µm. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling; Emulsifying activity; Hydrophilic properties. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000500007 |
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| Jordão Filho,José; Silva,José Humberto Vilar da; Silva,Cidinei Trajano; Costa,Fernando Guilherme Perazzo; Sousa,Janaína Maria Batista de; Givisiez,Patrícia Emília Naves. |
| This study aimed to estimate the energy requirements for maintenance and gain of Japanese and European quails under growth housed in two rearing systems: floor pens and cages. To determine maintenance requirements, two experiments were conducted with birds housed in cages in environmental chambers (experiment 1) and in floor pens at room temperature conditions (experiment 2). The experimental design was completely randomized with four levels of feed supply (100, 75, 50 and 25%) and four repetitions. Energy requirements for maintenance were estimated by the comparative slaughter method through a feeding trial. In experiment 1, 64 Japanese and European quails per treatment were housed in cages of climatic chambers at 18, 24, and 28 °C, while in experiment 2,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Breeding system; Energy; Modeling; Temperature. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001100019 |
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| Garlapati,Vijay Kumar; Vundavilli,Pandu Ranga; Banerjee,Rintu. |
| The aim of this work was to apply a modeling integrated optimisation approach for a complex, highly nonlinear system for an extracellular lipase extraction process. The model was developed using mutation, crossover and selection variables of Differential Evolution (DE) based on central composite design of Response Surface Methodology. The experimentally validated model was optimized by DE, a robust evolutionary optimization tool. A maximum lipase activity of 134.13 U/gds (more than 36.28 U/gds compared to one variable at a time approach) was observed with the DE-stated optimum values of 25.01% dimethyl sulfoxide concentration, 40 mM buffer, 128.52 min soaking time and 35ºC with the DE control parameters, namely number of population, generations, crossover... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Modeling; Optimization; Lipase extraction; Response surface methodology; Differential evolution; Solid state fermentation. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000500001 |
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| Franzan,Bruna Caroline; Franco,Tatiana Werneck; Stefani,Giselle; Pereira,Marcelo Maia; Almeida,Fernando Queiroz de; Silva,Vinicius Pimentel. |
| ABSTRACT This study evaluated the influence of coastcross hay substrate hydration and equine fecal inoculum dilution on the parameters of fermentation and microbiology in in vitro essays. A 2 × 2 factorial block design was used. The first factor was hydration of the coastcross hay substrate 12 h before incubation or at the time of incubation, and the second factor was the dilution of fecal inoculum with a nutrient solution in a weight: weight ratio of 1:1 or 1:3. Degradation of the dry matter (DM), organic matter (OM), and neutral detergent fiber (NDF) were evaluated at 24, 48, and 72 h. Microorganisms were counted 24 h after inoculation. The ammoniacal nitrogen concentration (NH3-N), pH, and cumulative gas production were measured up to 72 h and adjusted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Degradation rate; Gas production; Microbiology; Modeling; Roughage. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100531 |
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| Cordeiro, Márcio Assis; Pereira, Nayara Natacha de Jesus; Binoti, Daniel Henrique Breda; Binoti, Mayra Luiza Marques da Silva; Leite, Hélio Garcia. |
| The present study aimed to show the results of Acacia mangium volumetric estimates obtained through the Schumacher and Hall model compared to the methods of artificial neural networks and support vector machines. To enable this comparative analysis, we used data from 31 trees of Acacia mangium aged 14–17, from a stand located in the northern region of the state of Amapá. Diameter and bark thickness of the trees were measured into relative heights along the stem into 14 sections (0.05%, 1%, 5%, 10%, 15%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 95%), with measurement. Total volume with bark was obtained by applying the Smalian formula. In general, the methods that differ from traditional methods showed statistically superior results. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Smalian; Modeling; Volumetric estimates Engenharia Florestal Manejo Florestal Recursos Florestais Smalian; Modelagem; Estimativa volumétrica. |
| Ano: 2015 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/596 |
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| Registros recuperados: 223 | |
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