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A mathematical model to estimate the volume of grey water of pesticide mixtures. Repositório Alice
PARAIBA, L. C.; PAZIANOTTO, R. A. A.; LUIZ, A. J. B.; MAIA, A. de H. N.; JONSSON, C. M..
2013
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Herbicida; Cana de açúcar; Modelo matemático; Sugarcane; Herbicides; Water footprint; Freshwater; Mathematical model.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/970136
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Acidez potencial pelo método do pH SMP no Estado do Amazonas . Repositório Alice
MOREIRA, A.; ALMEIDA, M.P. de; COSTA, D.G.; SANTOS, L.S..
O objetivo deste trabalho foi definir um modelo matemático que estime o H+Al a partir do pH SMP medido em água e em solução de CaCl2 0,01 mol L-1 nas condições edafoclimáticas locais. Foram utilizadas 246 amostras de solo provenientes de diversas localidades. Mesmo apresentando menor coeficiente da correlação (r = 0,89*), a equação H+Al = 30,646 - 3,848pH SMP obtida em H2O foi mais eficiente que a obtida em solução CaCl2 (H+Al = 30,155 - 3,834pH SMP, r = 0,91*), a qual subestima os valores da acidez potencial.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Fator edáfico; Fator climático; Solução-tampão; Química do solo; Modelo matemático; Edaphic factors; Climatic factors; Buffer solution; Soil chemistry; Mathematical model.
Ano: 2004 URL: http://www.alice.cnptia.embrapa.br/handle/doc/106807
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An Unstructured Numerical Model to Study Wind-Driven Circulation Patterns in a Managed Coastal Mediterranean Wetland: The Vaccares Lagoon System ArchiMer
Boutron, Olivier; Bertrand, Olivier; Fiandrino, Annie; Hoehener, Patrick; Sandoz, Alain; Cherain, Yves; Coulet, Eric; Chauvelon, Philippe.
The spatiotemporal structure of wind-driven circulation patterns and associated water exchanges can drive important bio-hydrodynamic interactions in shallow lagoons. The Vaccares lagoon system is a complex shallow hydrosystem located in the central part of the Rhone Delta (France). It is internationally recognized as part of a biosphere reserve within the framework of UNESCO's Man and Biosphere Programme, and as a RAMSAR site. Due to its frequent occurrence in this area, and considering the shallowness of the Vaccares lagoon system, wind is assumed to play a major role in the hydrodynamic and biological processes. In this study, a hydrodynamic model was developed to investigate the structure of wind-driven circulations in the Vaccares lagoon system, to...
Tipo: Text Palavras-chave: Coastal lagoon; Mathematical model; Hydrodynamics; Calibration; Validation; Wind-driven circulation.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00303/41382/40558.pdf
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Analysis of batch and repeated fedbatch productions of Candida utilis cell mass using mathematical modeling method Electron. J. Biotechnol.
Lin,Yutian; Liu,Guoli; Lin,Huibin; Gao,Ling; Lin,Jianqiang.
Background: Candida utilis is widely used in bioindustry, and its cell mass needs to be produced in a cost effective way. Process optimization based on the experimental results is the major way to reduce the production cost. However, this process is expensive, time consuming and labor intensive. Mathematical modeling is a useful tool for process analysis and optimization. Furthermore, sufficient information can be obtained with fewer experiments by using the mathematical modeling, and some results can be predicted even without doing experiments. Results: In the present study, we performed the mathematical modeling and simulation for the cell mass production of Candida utilis based on limited batch and repeated fedbatch experiments. The model parameters...
Tipo: Journal article Palavras-chave: Candida utilis; Fermentation; Genetic algorithm; Mathematical model.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400002
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Application of approximate formulae to analyse the spectral distribution of the light attenuation coefficient ArchiMer
Kopec, J; Pawlak, B.
An analysis is made of the spectral distribution curves of the light attenuation coefficient in natural water areas and artificial roily oils in sea water samples under various conditions of salinity and storage time, using the approximate formulae based on the Mie theory.
Tipo: Text Palavras-chave: Modèle mathématique; Coefficient d'atténuation de la lumière; Théorie de Mie; Mathematical model; Light attenuation coefficient; Mie theory.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43647/43223.pdf
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Aprovechamiento de la humedad atmosférica como fuente no convencional de agua para uso doméstico. Colegio de Postgraduados
Bautista Olivas, Ana Laura.
En esta investigación se plantearon tres objetivos generales los cuales fueron: 1) Proponer un modelo matemático para predecir la cantidad de agua atmosférica que se puede obtener con el prototipo CP-HID-04 en la Ciudad de México considerando la humedad relativa del ambiente y temperatura ambiental; estos modelos se validaron calculando los siguientes índices: MBE (error medio), RMBE (raíz cuadrada del error cuadrático, D (Índice de acuerdo), R2 (coeficiente de determinación). 2) Cuantificar la cantidad de coliformes totales y fecales encontradas en muestras de agua atmosférica obtenidos en tres sitios de estudio: San Felipe Hidalgo, Tlaxcala; Huichapan, Hidalgo y en la Ciudad de México. 3) Evaluar la calidad del agua obtenida de la atmósfera,...
Palavras-chave: Agua atmosférica; Modelo matemático; Calidad de agua; Coliformes fecales; Metales pesados; Atmospheric water; Mathematical model; Water quality; Fecal coliform; Heavy metals; Hidrociencias; Doctorado.
Ano: 2013 URL: http://hdl.handle.net/10521/2008
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Avaliação do crescimento da agricultura amazônica. Infoteca-e
CARVALHO, R. de A.; FERREIRA, C. A. P.; HOMMA, A. K. O.; OLIVEIRA, R. P. de..
1994
Tipo: Documentos (INFOTECA-E) Palavras-chave: Desenvolvimento agrícola; Produção; Agricultura; Economia; Modelo matemático; Amazônia; Brasil; Agricultural development; Production; Agriculture; Economy; Mathematical model.
Ano: 1994 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/383671
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Avaliação do risco de contaminação da água subterrânea por agrotóxicos em Mato Grosso do Sul: efeito do clima e solo. Repositório Alice
SCORZA JUNIOR, R. P.; SIVIERI, F. H. C.; SEABRA, F. A. de S..
2016
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Solo; Clima; Modelo matemático; Agrotóxico; Soil; Climate; Mathematical model; Agrotoxic; PEARL.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1059808
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Development of moisture isotherms for Momordica charantia and Carica papaya CIGR Journal
Rupasinghe, chintha Priyangani; Jayasinghe, Udara; Sugathapala, Thusitha.
Safe moisture of a product is important in drying of agricultural products to prevent it from deterioration. The equilibrium moisture content (EMC) is an important parameter in modeling and simulation of drying process. The objectives of the research are development of an EMC curve for Agricultural Products; bitter gourd (Momordica charantia) and papaya (Carica papaya) and to test the suitability of mathematical models of modified Henderson’s equations. The study is performed on the basis of adsorption of moisture content, at three temperatures (30, 40 & 50°C) and four relative humidity (Rh) (10, 30, 50 and 80%). Salt solutions with concentrations were used to maintain Rh. The statistical analysis was done to find the best model and the significant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Post harvest technology Equilibrium moisture content; Adsorption; Isotherms; Mathematical model.
Ano: 2019 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5114
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Ecotron - Embiez 8 - Modélisation de la production d'organismes planctoniques dans les bassins ArchiMer
Nival, Paul; Malara, G..
Choosing the best conditions for the cultivation of plankton in tanks is a difficult deal, which is generally solved by means of subjective estimations. A better way of looking for these conditions is the use of a mathematical model. _ We have tried to built a model that accounts for the physical and bio­logical characteristics of the tanks. The data concerning the physiological characteristics of the different group of organisms encountered are too scarce to allow all of them to be taken into account. The system studied here is composed of nutrients, phytoplankton, herbivorous copepods and rotifers to which benthic algae have been added. With the hypothesis of 3 elements (phyto - zooplankton - nutrients) it can be showed that when an equilibrium is...
Tipo: Text Palavras-chave: Phytoplancton; Zooplancton; Culture; Modèle mathématique; Phytoplankton; Zooplankton; Culture; Mathematical model.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00306/41673/40882.pdf
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Estimativa de crescimento de suinos machos atraves de modelo matematico. Infoteca-e
FREITAS, A. R. de; COSTA, C. N..
1982
Tipo: Comunicado Técnico (INFOTECA-E) Palavras-chave: Suino; Estatistica; Modelo matematico; Crescimento; Swine; Statistics; Mathematical model; Growing.
Ano: 1982 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/434237
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Étude et modélisation des populations de macrophytes dans la lagune de Thau (Hérault, France) ArchiMer
Plus, Martin.
The works carried out can be divided in three main lines : design and management of experimental studies on primary production processes, macrophyte spatial distribution study and development of macrophyte and seagrass numerical models. In situ and in vitro experiments have been performed with the aim of studying the processes and the parameters involved in the photosynthesis-respiration system, as well as to establish the main biotic (self-shading effect, physiology of the photosynthesis, carbon, nitrogen and chlorophyll tissu contents) and abiotic (temperature, light and nutrients) factors controlling macrobenthic primary production. A seagrass ecosystem model based on nitrogen and oxygen fluxes has been developped. Model calibration and validation have...
Tipo: Text Palavras-chave: Primary production; Light; Nitrogen; Nutrients; Mathematical model; Thau lagoon; Seagrass; Macrophytes; Production primaire; Lumière; Azote; Nutriments; Model mathématique; Thau; Phanérogames; Macrophytes.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/these-6518.pdf
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Fontes de crescimento da agricultura paraense - 1970/80. Infoteca-e
HOMMA, A. K. O..
1981
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Agricultura; Economia; Modelo matematico; Produção; Arroz; Feijão; Mandioca; Milho; Juta; Malva; Pimenta-do-reino; Pará; Amazonia; Brasil; Agriculture; Economy; Mathematical model; Production; Rice; Frijol; Cassava; Maize; Jute; Mallow; Black pepper.
Ano: 1981 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/380315
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LOCALIZACAO DE FABRICAS MISTURADORAS DE ADUBO NA REGIAO CENTRO-OESTE BRASILEIRA: Uma Aplicacao de Programacao Linear AgEcon
Carvalho, Leandro Bernardino de.
Atualmente, dois dos grandes desafios com os quais o agronegócio brasileiro, responsável por aproximadamente 33% do PIB nacional (SECEX, 2005), se depara em seu constante crescimento são a alta dependência de produtos químicos (fertilizantes) para que sua fronteira agrícola se expanda e, conseqüentemente, as enormes distâncias (e custos de transportes) que essas fronteiras impõem para que sejam vencidas, tanto para o recebimento de insumos de produção, quanto para o fornecimento de seus produtos finais. Particularmente, a região Centro-Oeste brasileira, formada pelos Estados de Goiás, Mato Grosso, Mato Grosso do Sul e Distrito Federal, se enquadra em ambos os pontos – possui grandes fronteiras agrícolas a serem exploradas e, ao mesmo tempo, se localiza a...
Tipo: Presentation Palavras-chave: Logística; Transporte; Modelo matemático; Fertilizantes; Logistics; Transport; Mathematical model; Fertilizers; Agribusiness.
Ano: 2008 URL: http://purl.umn.edu/119008
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Mapping dairy plants and location strategies for whey processing in Rio de Janeiro, Brazil. Repositório Alice
CORTEZ, N. M. S.; ZOCCAL, R.; LEITE, J. L. B.; DIAS, J.; CORTEZ, M. A. S..
The objective of this study was to assess the technical and economic feasibility of the use of whey resulting from the cheese making process in the State of Rio de Janeiro. Data was collected from 52 dairy plants that produce or buy whey, by means of questionnaires. Based on the data obtained, a mathematical model for the location of processing plants was built, considering production logistics, sample collection, regions with potential to locate whey processing plants and possible areas of environmental impact from cheese industries. Whey processing was more concentrated in the south of the state of Rio de Janeiro, with 59.5% during the season, and 58.4% in the off-season period. The production in the season and off-season periods was stable, with good...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Cheese whey; Whey processing plant; Rio de Janeiro state; Mathematical model.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1036156
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Mathematical model for design of gender friendly farm equipment CIGR Journal
Singh, Shiv Pratap; Ekka, Utpal; Singh, Mukesh Kumar; Singh, M K.
Traditionally, the unit farm operations which require less muscle power is done by the women workers. The role of farm women are passive in majority of farm operations e.g. clod breaking, taking out weeds etc., assistance in sowing  e.g. dropping seeds or carrying seeds, weeding and interculture, harvesting, partly threshing as well as assistance in threshing, winnowing, cleaning-grading, carrying produce as well as grain. During last three decades, many research organizations in the country are working on assessment, refinement and development of gender friendly farm equipment. Based on various study conducted on gender perspective, a need was felt to work on algorithm, as algorithms design is a specific method to create a mathematical process in solving...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Farm Machinery and Power Weeder; Gender-friendly; Mathematical model; Design; Push force; Pull force.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4966
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Mathematical Model of a Dynamic Process of Transporting a Bulk Material by Means of a Tube Scraping Conveyor CIGR Journal
Lyashuk, Oleh Leontiyovych; Vovk, Yuriy Yaroslavovych; Sokil, Bohdan; Klendii, Volodymyr; Ivasechko, Roman; Dovbush, Taras.
The results of theoretical studies of simultaneous transporting  the components of feed mixtures along the curvilinear paths of tubular conveyors are presented in this article. The mathematical model of a technological process of moving a bulk material (grain) by means of a cable with a connected scraper is proposed. The model is presented as a system of elastic one-dimensional bodies, which are seamlessly moved by a bulk material. Nonlinear differential equations with partial derivatives that describe the dynamics of horizontal and vertical lines of a tube conveyor under the corresponding boundary conditions are deduced. Based on researches, the technique of determining the technological parameters, which ensure the reduction of energy consumption while...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mathematical model; Cable; Scraper; Conveyor; Bulk medium.
Ano: 2019 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4807
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Modelagem matemática para a secagem de clones de café (Coffea canephora Pierre) em terreiro de concreto - DOI: 10.4025/actasciagron.v31i2.588 Agronomy
Resende, Osvaldo; CEFETRV; Arcanjo, Rena Vieira; UNIR; Siqueira, Valdiney Cambuy; UNIR; Rodrigues, Silvestre; UNIR.
Objetivou-se com o presente trabalho estimar e avaliar as curvas de secagem do café da espécie Coffea Canephora e ajustar diferentes modelos matemáticos aos valores experimentais de quatro clones. Foram utilizados frutos de café dos clones: Cpafro 194, Cpafro 193, Cpafro 167 e Cpafro 180, colhidos com os teores de água iniciais de 1,20; 1,32; 1,51 e 1,46 (decimal b.s.), respectivamente. A secagem prosseguiu em terreiro de concreto até que o produto atingisse o teor de água de, aproximadamente, 0,10 (decimal b.s.). Aos dados experimentais foram ajustados dez modelos matemáticos, citados na literatura específica e utilizados para representação do processo de secagem de produtos agrícolas. Pelos resultados obtidos e com base em parâmetros estatísticos,...
Palavras-chave: 5.01.00.00-9 Agronomia café; Clones; Modelagem matemática; Teor de água Pré-Processamento de Produtos Agrícolas coffee berry; Clones; Mathematical model; Moisture content.
Ano: 2009 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/588
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Modeling continuous cultures of microalgae colimited by nitrogen and phosphorus ArchiMer
Bougaran, Gael; Bernard, Olivier; Sciandra, Antoine.
It is well documented that the combination of low nitrogen and phosphorus resources can lead to situations where colimitation of phytoplankton growth arises, yet the underlying mechanisms are not fully understood. Here, we propose a Droop-based model built on the idea that colimitation by nitrogen and phosphorus arises from the uptake of nitrogen. Indeed, since N-porters are active systems, they require energy that could be related to the phosphorus status of the cell. Therefore, we assumed that N uptake is enhanced by the P quota. Our model also accounts for the biological observations that uptake of a nutrient can be down-regulated by its own internal quota, and succeeds in describing the strong contrast for the non-limiting quotas under N-limited and...
Tipo: Text Palavras-chave: Colimitation; Phytoplankton; Mathematical model; Quota.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12216/9060.pdf
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Modelling of the biofiltration of reduced sulphur compounds through biotrickling filters connected in series: Effect of H2S Electron. J. Biotechnol.
Silva,Javier; Morales,Marjorie; Cáceres,Manuel; Morales,Paulina; Aroca,Germán.
Background: The behaviour of two biotrickling filters connected in serie (BTF) inoculated with Acidithiobacillus thiooxidans and Thiobacillus thioparus, biodegrading hydrogen sulphide (H2S) and dimethyl sulphide (DMS) simultaneously were studied. A model which considers gas to liquid mass transfer and biooxidation in the biofilm attached to the support is developed. Additionally, a fixed bed biotrickling filter where the microorganism is immobilized in a biofilm which degrades a mixture of H2S and DMS is implemented. Validation of the model was carried out using experimental data obtained at different H2S and DMS loads. Results: The inhibitory effect caused by the presence of H2S on the DMS is observed, which is evidenced by the decrease of the DMS removal...
Tipo: Journal article Palavras-chave: Biofiltration; DMS; Hydrogen sulphide; Mathematical model; Thiobacillus thioparus.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300007
Registros recuperados: 34
Primeira ... 12 ... Última
 

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