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A importância do ajuste fino de distribuições de probabilidade em modelos baseados no indivíduo. Repositório Alice
GALVÃO, M. M.; BARBOSA, F. F. L.; TERNES, S..
RESUMO - O Huanglongbing (HLB) é atualmente a principal doença para a citricultura mundial e no Brasil ela é transmitida principalmente pelo inseto vetor Diaphorina citri. A Embrapa vem realizando estudos para compreender o patossistema HLB - D. citri - citros, fazendo uso de modelos matemáticos computacionais seguindo a abordagem da modelagem baseada no indivíduo (MBI). Num MBI é possível representar as características de cada indivíduo da população e seus processos (nascimento, reprodução, morte, estados epidemiológicos), os quais evoluem estocasticamente e discretamente no tempo. O ajuste de distribuições de probabilidade e a garantia da aleatoriedade nos processos do modelo são muito importantes em um MBI, uma vez que o comportamento final da população...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Modelagem baseada no indivíduo; Distribuições de probabilidade; Modelagem matemática; Huanglongbing; Probability distributions; Mathematical modeling; Citriculture; Citricultura; Mathematical models.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1096174
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Accuracy of Nonlinear Formulation of Broiler Diets: Maximizing Profits Rev. Bras. Ciênc. Avic.
Gonçalves,CA; de Almeida,MA; Faria-Júnior,MJA; Pinto,MF; Garcia-Neto,M.
Nutritionists need to make commercial decisions about the optimal nutrient content broiler feeds. In order to demonstrate that broiler prices may influence dietary nutrient density, this study developed quadratic feed intake and weight gain equations, according to broiler sex and feeding phase, to be applied in a nonlinear feed formulation model. Four hundred and eighty Cobb broilers were allotted to a completely randomized experimental with six treatments, each with four replicates of 10 birds each, from 1 to 56 days old. Treatments consisted of diets containing 2800, 2900, 3000, 3100, 3200, or 3300 kcal metabolizable energy (ME)/kg and constant nutrient to ME ratio. A nonlinear version of the PPFR feed formulation software (http://www.fmva.unesp.br/ppfr)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Energy; Excel; Mathematical modeling; Nutrition; Response surface.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000200173
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ACHA: Avaliação da Contaminação hídrica por agrotóxico. Infoteca-e
SCORZA JUNIOR, R. P.; NÉVOLA, F. A.; AYELO, V. S..
Modelos matemáticos e simuladores têm sido desenvolvidos para prever a lixiviação de agrotóxicos em solos, permitindo grande economia de tempo e recursos financeiros, além de permitir análises de risco com maior representatividade e confiabilidade. O Brasil ainda não faz uso dessas ferramentas no processo de avaliação de risco e classificação ambiental dos agrotóxicos. Estas ferramentas não são utilizadas pelas autoridades nacionais por não estarem adaptadas às condições brasileiras. O presente trabalho teve como objetivo desenvolver uma ferramenta computacional para simulação da lixiviação de agrotóxicos em cenários agrícolas brasileiros. A ferramenta computacional recebeu o nome de ACHA, que se refere ao acrônimo de Avaliação da Contaminação Hídrica por...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Modelagem matemática; Lixiviação; Agrotóxico; Pesticide; Leaching; Mathematical modeling.
Ano: 2010 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/880316
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Adjust of regression models to estimate the rectal temperature of broilers for the first 14 days of life REA
Ponciano,Patrícia F.; Yanagi Junior,Tadayuki; Lima,Renato R. de; Schiassi,Leonardo; Teixeira,Vitor H..
The broiler rectal temperature (t rectal) is one of the most important physiological responses to classify the animal thermal comfort. Therefore, the aim of this study was to adjust regression models in order to predict the rectal temperature (t rectal) of broiler chickens under different thermal conditions based on age (A) and a meteorological variable (air temperature - t air) or a thermal comfort index (temperature and humidity index -THI or black globe humidity index - BGHI) or a physical quantity enthalpy (H). In addition, through the inversion of these models and the expected t rectal intervals for each age, the comfort limits of t air, THI, BGHI and H for the chicks in the heating phase were determined, aiding in the validation of the equations and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Thermal environment; Poultry; Thermal comfort; Mathematical modeling; Physiological responses.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100002
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Application of the Hsu model to soybean grain hydration Ciênc. Tecnol. Aliment.
Coutinho,Mônica Ronobo; Conceição,Wagner André dos Santos; Paraíso,Paulo Roberto; Andrade,Cid Marcos Gonçalves; Omoto,Edilson Sadayuki; Jorge,Regina Maria Matos; Maciel Filho,Rubens; Jorge,Luiz Mario de Matos.
A comparative analysis of the theoretical-experimental study, developed by Hsu on the hydration of Amsoy 71 soybean grain, was performed through several soaking experiments using CD 202 soybean at 10, 20, 30, 40, and 50 °C, measuring moisture content over time. The results showed that CD 202 soybean equilibrium moisture content, Xeq, does not depend on temperature and is 21% higher than that found by Hsu, suggesting that soybean cultivar exerts great influence on Xeq. The Hsu model was numerically solved and its parameters were adjusted by the least squares method, with maximum deviations of +/- 10% relative to the experimental values. The limiting step in the mass transfer process during hydration corresponds to water diffusion inside the grain, leading...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soaking; Mathematical modeling; Distributed parameters; Mass diffusivity; Equilibrium moisture.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612010000100003
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Assessment of lettuce quality during storage at low relative humidity using Global Stability Index methodology Ciênc. Tecnol. Aliment.
Ansorena,María Roberta; Agüero,María Victoria; Goñi,María Grabriela; Roura,Sara; Ponce,Alejandra; Moreira,María del Rosario; Di Scala,Karina.
During postharvest, lettuce is usually exposed to adverse conditions (e.g. low relative humidity) that reduce the vegetable quality. In order to evaluate its shelf life, a great number of quality attributes must be analyzed, which requires careful experimental design, and it is time consuming. In this study, the modified Global Stability Index method was applied to estimate the quality of butter lettuce at low relative humidity during storage discriminating three lettuce zones (internal, middle, and external). The results indicated that the most relevant attributes were: the external zone - relative water content, water content , ascorbic acid, and total mesophilic counts; middle zone - relative water content, water content, total chlorophyll, and ascorbic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Butter lettuce; Quality indices; Shelf life; Mathematical modeling; Weibull distribution.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000200024
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Automated sugar analysis Ciênc. Tecnol. Aliment.
MARQUES,Tadeu Alcides; RAMPAZO,Érick Malheiros; ZILLIANI,Rafael Rebes; MARQUES,Patricia Angélica Alves; BENINCASA,Fabio.
Abstract Sugarcane monosaccharides are reducing sugars, and classical analytical methodologies (Lane-Eynon, Benedict, complexometric-EDTA, Luff-Schoorl, Musson-Walker, Somogyi-Nelson) are based on reducing copper ions in alkaline solutions. In Brazil, certain factories use Lane-Eynon, others use the equipment referred to as “REDUTEC”, and additional factories analyze reducing sugars based on a mathematic model. The objective of this paper is to understand the relationship between variations in millivolts, mass and tenors of reducing sugars during the analysis process. Another objective is to generate an automatic model for this process. The work herein uses the equipment referred to as “REDUTEC”, a digital balance, a peristaltic pump, a digital camcorder,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mathematical modeling; Monosaccharide; Chemical determination.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612016000100070
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Avaliacao da suscetibilidade natural a erosao dos solos da Bacia do Olaria, Distrito Federal. Infoteca-e
BLOISE, G. de L. F.; CARVALHO JUNIOR, O. A. de; REATTO, A.; GUIMARAES, R. F.; MARTINS, E. de S.; CARVALHO, A. P. F. de..
2001
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: ECOSOL220; Cerrado; Solo; Erosao do solo; Topografia; Bacia hidrografiaca; Bacia do Olaria; Distrito Federal; Brasil; Modelo matematico; Erodibilidade; Potencial erosivo; Mathematical modeling; Erodibility; Erosion potential; Solo: Erosao.
Ano: 2001 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/566082
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Bayesian approach, traditional method, and mixed models for multienvironment trials of soybean PAB
Silva,Alysson Jalles da; Sanches,Adhemar; Andrade,Andréa Carla Bastos; Oliveira,Gustavo Hugo Ferreira de; Mauro,Antonio Orlando Di.
Abstract: The objective of this work was to compare the Bayesian approach and the frequentist methods to estimate means and genetic parameters in soybean multienvironment trials. Fifty-one soybean lines and four controls were evaluated in a randomized complete block design, in six environments, with three replicates, and soybean grain yield was determined. The half-normal prior and uniform distributions were used in combination with parameters obtained from data of 18 genotypes collected in previous and related experiments. The genotypic values of the genotypes of high- and low-grain yield, clustered by the Bayesian approach, differed from the means obtained by the frequentist inference. Soybean assessed through the Bayesian approach showed genetic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Mathematical modeling; Prior distribution in plant breeding.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001001093
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Bean grain hysteresis with induced mechanical damage AGRIAMBI
Campos,Renata C.; Corrêa,Paulo C.; Fernandes,Lara S.; Baptestini,Fernanda M.; Costa,Cristian F.; Bustos-Vanegas,Jaime D..
ABSTRACT This study aimed to evaluate the effect of mechanical damage on the hysteresis of beans with induced mechanical damage under different conditions of temperature and relative humidity. Beans (Phaseolus vulgaris L.) harvested manually with 35% water content (w.b.) were used. Part of this product was subjected to induced mechanical damage by Stein Breakage Tester and controlled drying (damaged and control sample), for sorption processes. The sorption isotherms of water were analyzed for different temperature conditions: 20, 30, 40 and 50 oC; and relative humidity: 0.3; 0.4; 0.5; 0.7 and 0.9 (decimal). Equilibrium moisture content data were correlated with six mathematical models, and the Modified Oswin model was the one that best fitted to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mechanical damage; Equilibrium moisture content; Sorption isotherms; Mathematical modeling; Phaseolus vulgaris L..
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001000930
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Bimodal pore distribution on soils under conservation management system for coffee crop REA
Carducci,Carla E.; Oliveira,Geraldo C. de; Zeviani,Walmes M.; Lima,Vico M. P.; Serafim,Milson E..
This study aims at detailing bimodal pore distribution by means of water retention curve in an oxidic-gibbsitic Latosol and in a kaolinitic cambisol Latossol under conservation management system of coffee crop. Samples were collected at depths of 20; 40; 80; 120 and 160 cm on coffee trees rows and between rows under oxidic-gibbsitic Latosol (LVd) and kaolinitic cambisol Latossol (LVAd). Water retention curve was determined at matrix potentials (Ψm) -1; -2; -4; -6; -10 kPa obtained from the suction unit; the Ψm of -33; -100; -500; -1,500 kPa were obtained by the Richards extractor, and WP4-T psychrometer was used to determine Ψm -1,500 to -300,000 kPa. The water retention data were adjusted to the double van Genuchten model by nonlinear model procedures of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Psychrometer; Mathematical modeling; Cerrado soils.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000200008
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Computational fluid dynamics evaluation of liquid food thermal process in a brick shaped package Ciênc. Tecnol. Aliment.
Augusto,Pedro Esteves Duarte; Cristianini,Marcelo.
Food processes must ensure safety and high-quality products for a growing demand consumer creating the need for better knowledge of its unit operations. The Computational Fluid Dynamics (CFD) has been widely used for better understanding the food thermal processes, and it is one of the safest and most frequently used methods for food preservation. However, there is no single study in the literature describing thermal process of liquid foods in a brick shaped package. The present study evaluated such process and the influence of its orientation on the process lethality. It demonstrated the potential of using CFD to evaluate thermal processes of liquid foods and the importance of rheological characterization and convection in thermal processing of liquid...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mathematical modeling; Computational fluid dynamics (CFD); Process optimization; Thermal process; Sterilization.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000100020
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Desorption isotherms of Lactuca sativa seeds AGRIAMBI
Zeymer,Juliana S.; Corrêa,Paulo C.; Oliveira,Gabriel H. H. de; Baptestini,Fernanda M.; Freitas,Rita C. P..
ABSTRACT Lactuca sativa seeds are highly sensitive to climate conditions; thus, they should be stored securely to maintain their qualitative and quantitative characteristics. Studies on hygroscopicity aim to decrease possible changes in agricultural products under specific environmental conditions. Accordingly, this study aims to develop an appropriate mathematical model to represent the desorption isotherms of Lactuca sativa seeds. The hygroscopic equilibrium was achieved using a static-gravimetric method at temperatures of 10, 20, 30, 40 and 50 °C and water activity in the range 0.11-0.96. Six mathematical models were fitted to the experimental data of the equilibrium moisture content of Lactuca sativa seeds. The best model was chosen based on the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mathematical modeling; Hygroscopic equilibrium; Relative humidity; Temperature.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000800568
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Drying and colour characteristics of Cleome gynandra L. (spider plant) leaves Ciênc. Tecnol. Aliment.
OMOLOLA,Adewale Olusegun; KAPILA,Patrick Francis; SILUNGWE,Henry.
Abstract Drying characteristics of Cleome leaves in an oven dryer was studied. The impact of oven drying temperature (50, 60 and 70 °C) on moisture composition of the plant at a uniform air speed was considered. Eight drying models, namely, simple exponential, Page, Verma, modified Henderson and Pabis, Lewis, two term exponential, Newton, logarithmic, and Wang and Singh were fitted to drying data. Modified Henderson and Pabis model satisfactorily depicts the drying behaviour of Cleome leaves. Effective moisture diffusivity of Cleome ranged from 1.03 × 10−6 to 1.77 × 10−5 m2/s. Reliance of the calculated effective diffusivity on oven temperature was unavoidable. The required activation energy for oven drying of Cleome leaves was found to be 24.46 kJ/mol....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cleome gynandra L.; Colour; Oven drying; Effective diffusivity; Mathematical modeling; Activation energy.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019000600588
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Drying kinetics and physical and chemical characterization of white-fleshed ‘pitaya’ peels AGRIAMBI
Santos,Francislaine S. dos; Figueirêdo,Rossana M. F. de; Queiroz,Alexandre J. de M.; Santos,Dyego da C..
ABSTRACT The objective of this work was to obtain the drying kinetic curves of white-fleshed ‘pitaya’ peels and characterize the obtained powder regarding physical and chemical parameters. Different mathematical models were fitted to the experimental data of drying kinetics, considering the coefficient of determination (R2), mean square deviation (MSD) and residual distribution as fit criteria. The peels had an initial moisture content of 93.38% (w.b.) and final moisture contents of 5.39% at temperature of 50 °C, 5.27% at 60 °C and 4.40% at 70 °C. After drying, the peels were disintegrated to obtain the powders and characterized for moisture content, reducing sugars, total titratable acidity, ascorbic acid, betacyanins, betaxanthins, water activity and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hylocereus undatus; Dehydration; Mathematical modeling; Betalains.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001200872
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Drying kinetics modeling of apple and zucchini slices vacuum impregnated with anthocyanins Ciência Rural
Zapata,Luz Marina; Castagnini,Juan Manuel; Quinteros,Carlos Fabio; Veuthey,Mariana Jimenez.
ABSTRACT: The aim of this research was to study the drying kinetics of apple and zucchini slices enriched with anthocyanins and to evaluate the influence of drying temperature on the anthocyanin content of apple and zucchini snacks. Apple (Granny Smith) and zucchini (Cucurbita pepo) slices were enriched with anthocyanins by vacuum impregnation with blueberry juice. Then, slices were dehydrated at 40, 50 and 60 ºC with 1.0 m/s air flow. Dehydrated samples were referred to as anthocyanin enriched snacks. Diffusion coefficient values improved by increasing the drying temperature, within the 2.81×10-10 to 5.78×10-10 m2/s range for apple slices and 2.02×10-10 to 3.99×10-10 m2/s for zucchini slices. The activation energy was 31.19 kJ/mol and 80.33 kJ/mol for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Drying kinetics; Mathematical modeling; Functional snacks; Anthocyanins.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001000755
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DRYING KINETICS OF BARU FRUITS (Dipteryx alata Vogel) REA
Resende,Osvaldo; Oliveira,Daniel E. C. de; Costa,Lílian M.; Ferreira Júnior,Weder N..
ABSTRACT This study aimed to fit different mathematical models to the experimental data on drying of baru fruits (Dipteryx alata Vogel), determine and assess the effective diffusion coefficient, as well as obtain the activation energy and thermodynamic properties for the drying process under different air temperature conditions. Baru fruits with an initial moisture content of 0.429 ± 0.044 (dry basis, db) were dried in a forced air ventilation oven under four temperature conditions (40, 60, 80, and 100 °C) until reaching a moisture content of 0.065 ± 0.018 (decimal db). These data were fitted to mathematical models frequently used to represent the drying of vegetal products. The Logarithmic model presented the best fit to describe the phenomenon. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mathematical modeling; Liquid diffusivity; Logarithmic.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000100103
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Drying kinetics of sunflower grains AGRIAMBI
Smaniotto,Thaís A. de S.; Resende,Osvaldo; Sousa,Kelly A. de; Oliveira,Daniel E. C. de; Campos,Rafael C..
ABSTRACT The objectives of this study were to fit different mathematical models to experimental data of drying of sunflower grains, determine and evaluate the effective diffusion coefficient and obtain the activation energy for the process during the drying under various conditions of air. The sunflower grains were collected with an initial moisture content of 0.5267 dry basis (d.b.) and dried in an oven with forced air ventilation under five temperature conditions: 35, 50, 65, 80 and 95 °C, until reaching the moisture content of 0.0934 ± 0.0061 (d.b.). Among the analyzed models, Wang and Singh showed the best fit to describe the drying phenomenon. The effective diffusion coefficient of sunflower grains increased with the increment in air temperature and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mathematical modeling; Heliantus annus; Liquid diffusivity.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000300203
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Drying kinetics of yellow mombin (Spondias mombin L.) epicarp AGRIAMBI
Pinheiro,Gleyce K. I.; Oliveira,Daniel E. C. de; Ferreira Junior,Weder N.; Resende,Osvaldo.
ABSTRACT Yellow mombin (Spondias mombin L.) fruits have relevant characteristics for industrialization and exhibit a pleasant aroma and sour-sweet taste, with significant amounts of vitamin A and carotenoids in their epicarp. The objective was to fit different mathematical models to the experimental data, using as criteria to select the best model - the Akaike Information Criteria (AIC) and Schwarz’s Bayesian Information Criteria (BIC), as well as to evaluate the effective diffusion coefficient and to determine the activation energy for yellow mombin epicarp submitted to different drying conditions. The experiment was carried out at the Instituto Federal de Educação, Ciência e Tecnologia Goiano, Brazil The epicarp of yellow mombin fruits with initial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mathematical modeling; AIC; BIC; Midilli model.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000200121
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Dynamics of adventitious rooting in mini-cuttings of Eucalyptus benthamii x Eucalyptus dunnii - doi: 10.4025/actasciagron.v34i2.13059 Agronomy
Brondani, Gilvano Ebling; Escola Superior de Agricultura "Luiz de Queiroz" (ESALQ/USP); Wendling, Ivar; Empresa Brasileira de Pesquisa Agropecuária (Embrapa - Florestas); Brondani, André Ebling; Universidade Federal Fluminense; Araujo, Marla Alessandra; Universidade Federal de Lavras; Silva, André Luís Lopes da; Universidade Federal do Paraná; Gonçalves, Antonio Natal; Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo.
It is possible to determine the optimum time for permanence of vegetative propagules (mini-cuttings) inside a greenhouse for rooting, and this value can be used to optimize the structure of the nursery. The aim of this study was to determine the dynamics of adventitious rooting in mini-cuttings of three clones of Eucalyptus benthamii x Eucalyptus dunnii. Sprouts of H12, H19 and H20 clones were collected from mini-stumps that were planted in gutters containing sand and grown in a semi-hydroponic system. The basal region of the mini-cuttings was immersed in 2,000 mg L-1 indole-3-butyric acid (IBA) solution for 10 seconds. The rooting percentage of the mini-cuttings, the total length of the root system and the rooting rate per mini-cutting were also evaluated...
Tipo: Pesquisa Palavras-chave: 5.01.03.04-0 vegetative propagation; Clonal forestry; Organogenesis; Mathematical modeling; Rhizogenesis; Clonal mini-garden 5.01.03.04-0.
Ano: 2012 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/13059
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