Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 21
Primeira ... 12 ... Última
Imagem não selecionada

Imprime registro no formato completo
Exploring the best model for sorting Blood orange using ANFIS method CIGR Journal
Sabzi, Sajad; Javadikia, Payam; Rabbani, Hekmat; Adelkhani, Ali; Naderloo, Leila.
OranOrange has abundant nutritional properties and is consumed worldwide.  Sorting oranges of different masses based on their physical traits could help reduce packaging and transportation cost.  The ‘Blood’ cultivar of Iranian oranges from Kermanshah province of Iran (7.03 °E 4.22 °N) was used in this study.  100 samples were randomly selected.  During the two-day experiment, all measurements were carried out inside the laboratory at mean temperature of 24°C.  In this study, some physical properties of ‘Blood’ orange were measured, such as length, width, thickness, volume, mass, mean value of geometric diameter, sphericity and projected area.  ANFIS and linear regression models were employed to predict the mass based on sphericity and mean of projected...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Linear regression; Orange; Packaging; Physical properties; Sorting.
Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2348
Imagem não selecionada

Imprime registro no formato completo
Hourly interaction between wind speed and energy fluxes in Brazilian Wetlands - Mato Grosso - Brazil Anais da ABC (AABC)
RODRIGUES,THIAGO R.; CURADO,LEONE F.A.; PEREIRA,VINICIUS M.R.; SANCHES,LUCIANA; NOGUEIRA,JOSÉ S..
ABSTRACT Matter and energy flux dynamics of wetlands are important to understand environmental processes that govern biosphere-atmosphere interactions across ecosystems. This study presents analyses about hourly interaction between wind speed and energy fluxes in Brazilian Wetlands - Mato Grosso - Brazil. This study was conducted in Private Reserve of Natural Heritage (PRNH SESC, 16º39'50''S; 56º47'50''W) in Brazilian Wetland. According to Curado et al. (2012), the wet season occurs between the months of January and April, while the June to September time period is the dry season. Results presented same patterns in energies fluxes in all period studied. Wind speed and air temperature presented same patterns, while LE was relative humidity presented inverse...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Energy balance; Latent heat flux; Linear regression; Micrometeorology; Pantanal; Sensible heat flux.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000602195
Imagem não selecionada

Imprime registro no formato completo
Feedstock and inoculum characteristics and process parameters as predictors for methane yield in mesophilic solid-state anaerobic digestion Anais da ABC (AABC)
NIQUINI,GABRIELA R.; SILVA,SUZIMARA R.; COSTA JUNIOR,ESLY F.; COSTA,ANDRÉA O.S..
Abstract: In this study, several linear regression models were tested to predict the cumulative 30-day methane yield produced in mesophilic solid-state anaerobic digestion, employing diverse lignocellulosic biomass sources. Data collected from 13 studies were utilized, totalizing 86 experimental points, divided into regression and validation. Models containing higher order terms, the inverse of variables and interactions among all eleven input variables were tested. Simple linear models utilizing a single variable were unable to describe the methane production, giving an R² lower than 0.37. However, combinations of multiple variables and its inverses as only independent variable permitted an increase in simple linear models predictive capacity up to 63% of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lignocellulosic biomass; Linear regression; Methane; Polynomial models; Solid-state anaerobic digestion.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700865
Imagem não selecionada

Imprime registro no formato completo
Prediction of Hevea progeny performance in the presence of genotype-environment interaction BABT
Gonçalves,Paulo de Souza; Moraes,Mário Luiz Teixeira de; Silva,Marcelo de Almeida; Gouvêa,Lígia Regina Lima; Aguiar,Adriano Tosoni da Eira; Costa,Reginaldo Brito da.
Twenty two open-pollinated Hevea progenies from different parental clones of the Asian origin were tested at five sites in the Northwestern São Paulo State Brazil to investigate the progeny girth growth, rubber yield, bark thickness and plant height. Except for the rubber yield, the analysis of variance indicated highly significant (p<0.01) genotype x environment interaction and heterogeneity of regressions among the progenies. However, the regression stability analysis identified only a few interacting progenies which had regression coefficients significantly different from the expected value of one. The linear regressions of the progeny mean performance at each test on an environmental index (mean of all the progenies in each test) showed the general...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hevea brasiliensis; Stability; Adaptability; Environmental index; Linear regression.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100004
Imagem não selecionada

Imprime registro no formato completo
Influence of fermentation time on characteristics of sourdough bread BJPS
Aplevicz,Krischina Singer; Ogliari,Paulo José; Sant'Anna,Ernani Sebastião.
Sourdough is used in the manufacture of numerous baked products. The microorganisms used in this preparation of sourdoughs included two strains from the Lactobacillus paracasei (1 and 2) and two strains from the Saccharomyces cerevisiae group (1 and 2). Samples of raw dough were analyzed for pH, titratable acidity and plate counts and samples of resulting bread were analyzed for pH, titratable acidity and specific volume. The samples were analyzed every 2 h, between 4 and 10 h of fermentation. After 10 hours of fermentation, the lowest values of pH were for dough with LC2 and bread with SC1. Titratable acidity values increased over time, with the highest levels of acidity were found in the dough and bread with yeasts. Lactic acid bacteria showed the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sourdough; Bread; Lactic acid bacteria; Yeast; Linear regression.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502013000200005
Imagem não selecionada

Imprime registro no formato completo
Comparison of Regression and Neural Networks Models to Estimate Solar Radiation Chilean J. Agric. Res.
Bocco,Mónica; Willington,Enrique; Arias,Mónica.
The incident solar radiation on soil is an important variable used in agricultural applications; it is also relevant in hydrology, meteorology and soil physics, among others. To estimate this variable, empirical models have been developed using several parameters and, recently, prognostic and prediction models based on artificial intelligence techniques such as neural networks. The aim of this work was to develop linear models and neural networks, multilayer perceptron, to estimate daily global solar radiation and compare their efficiency in its application to a region of the Province of Salta, Argentina. Relative sunshine duration, maximum and minimum temperature, rainfall, binary rainfall and extraterrestrial solar radiation data for the period...
Tipo: Journal article Palavras-chave: Modeling; Prediction; Linear regression; Multilayer perceptron.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300010
Imagem não selecionada

Imprime registro no formato completo
Monitoreo de Eoreuma loftini (Lepidoptera: Crambidae) en caña de azúcar con su feromona sexual en Morelos, México. Colegio de Postgraduados
Barroso Aké, Hanzel Jesús.
Eoreuma loftini (Lepidoptera: Crambidae) es un problema fitosanitario en la zona productora de caña de azúcar de Tlaquiltenango, Morelos, México. Para ampliar el conocimiento de esta especie, en este trabajo se plantearon los objetivos siguientes: conocer la fluctuación población de E. loftini; evaluar la eficacia de captura de machos con la feromona comercial; determinar la relación entre capturas, temperatura y precipitación pluvial y estimar la duración del atrayente en campo. Se establecieron dos experimentos con trampas tipo “ala”; el primero del mes de febrero de 2013 con revisiones quincenales hasta enero de 2014. En el cual, el liberador de la feromona se renovó mensualmente. El experimento dos, se llevó a cabo de abril a diciembre de 2013, con...
Palavras-chave: Fluctuación poblacional; Regresión lineal; Trampa tipo "ala"; Citocromo oxidasa I.; Population dynamics; Linear regression; Trap type "wing"; Cytochrome oxidase I.; Entomología y Acarología; Maestría.
Ano: 2014 URL: http://hdl.handle.net/10521/2364
Imagem não selecionada

Imprime registro no formato completo
Almacenamiento de carbono en bosques manejados de pinus patula: Estimación mediante percepción remota Colegio de Postgraduados
Aguirre Salado, Carlos Arturo.
Se presenta la metodología y los resultados obtenidos sobre estimación de almacenamiento de carbono mediante técnicas de percepción remota en bosques manejados de Pinus patula en Zacualtipán, Hidalgo, México; la cual surge como una necesidad de monitoreo de los recursos forestales a partir de los compromisos adquiridos por México en el Protocolo de Kyoto para aminorar el inminente cambio climático causado por los denominados gases invernadero (CO2). En esta tesis se estudia principalmente el carbono (CHA) (Mg/ha) aunque preliminarmente resulta necesaria la cuantificación de biomasa (BHA) (Mg/ha). De manera paralela también se estudian algunos parámetros forestales de densidad como índice de área foliar (IAF) (m2/ m2), cobertura arbórea (COB) (%), área...
Palavras-chave: Carbono; Índice de área foliar; Cobertura arbórea; Regresión lineal; K-nn; Percepción remota; SPOT 5; Fotografía hemisferica; Bosque de Pinus patula. Carbon; Leaf area index; Canopy closure; Linear regression; K-nn; Remote sensing; SPOT 5; Hemispherical photography; Pinus patula forest..
Ano: 2012 URL: http://hdl.handle.net/10521/849
Imagem não selecionada

Imprime registro no formato completo
Almacenamiento de carbono en bosques manejados de pinus patula: Estimación mediante percepción remota Colegio de Postgraduados
Aguirre Salado, Carlos Arturo.
Se presenta la metodología y los resultados obtenidos sobre estimación de almacenamiento de carbono mediante técnicas de percepción remota en bosques manejados de Pinus patula en Zacualtipán, Hidalgo, México; la cual surge como una necesidad de monitoreo de los recursos forestales a partir de los compromisos adquiridos por México en el Protocolo de Kyoto para aminorar el inminente cambio climático causado por los denominados gases invernadero (CO2). En esta tesis se estudia principalmente el carbono (CHA) (Mg/ha) aunque preliminarmente resulta necesaria la cuantificación de biomasa (BHA) (Mg/ha). De manera paralela también se estudian algunos parámetros forestales de densidad como índice de área foliar (IAF) (m2/ m2), cobertura arbórea (COB) (%), área...
Palavras-chave: Carbono; Índice de área foliar; Cobertura arbórea; Regresión lineal; K-nn; Percepción remota; SPOT 5; Fotografía hemisferica; Bosque de Pinus patula. Carbon; Leaf area index; Canopy closure; Linear regression; K-nn; Remote sensing; SPOT 5; Hemispherical photography; Pinus patula forest..
Ano: 2012 URL: http://hdl.handle.net/10521/789
Imagem não selecionada

Imprime registro no formato completo
Almacenamiento de carbono en bosques manejados de pinus patula: Estimación mediante percepción remota Colegio de Postgraduados
Aguirre Salado, Carlos Arturo.
Se presenta la metodología y los resultados obtenidos sobre estimación de almacenamiento de carbono mediante técnicas de percepción remota en bosques manejados de Pinus patula en Zacualtipán, Hidalgo, México; la cual surge como una necesidad de monitoreo de los recursos forestales a partir de los compromisos adquiridos por México en el Protocolo de Kyoto para aminorar el inminente cambio climático causado por los denominados gases invernadero (CO2). En esta tesis se estudia principalmente el carbono (CHA) (Mg/ha) aunque preliminarmente resulta necesaria la cuantificación de biomasa (BHA) (Mg/ha). De manera paralela también se estudian algunos parámetros forestales de densidad como índice de área foliar (IAF) (m2/ m2), cobertura arbórea (COB) (%), área...
Tipo: Tesis Palavras-chave: Carbono; Índice de área foliar; Cobertura arbórea; Regresión lineal; K-nn; Percepción remota; SPOT 5; Fotografía hemisferica; Bosque de Pinus patula.; Carbon; Leaf area index; Canopy closure; Linear regression; K-nn; Remote sensing; SPOT 5; Hemispherical photography; Pinus patula forest..
Ano: 2007 URL: http://hdl.handle.net/10521/1172
Imagem não selecionada

Imprime registro no formato completo
Yield prediction of experimental plots based on the harvest of specific fruit clusters for selection of fresh market tomato hybrids Horticultura Brasileira
Silva,Paulo TP; Oliveira,Gustavo E; Peloia,Paulo R; Carvalho,Regis C; Gonçalves,Flávia Maria A.
ABSTRACT The objective of this study was to propose models based on the harvest of specific fruit clusters to estimate the plot yield of trials containing fresh market tomato hybrids. Three experiments were conducted at the Experimental Station of Syngenta Crop Protection in the municipality of Holambra, state of São Paulo, Brazil, in 2016 and 2017. The experimental design was randomized complete blocks with 12 genotypes (experiments 1 and 3) and 13 genotypes (experiment 2), with 4 replicates and 10 plants per plot. Multiple linear regression models were fitted (stepwise method) with experiment 1 data (cross-validation), the best models were selected (higher adjusted R²) and then tested with experiments 2 and 3 data by mean of absolute percentage error...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Solanum lycopersicum; Tomato breeding; Linear regression.
Ano: 2021 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100058
Imagem não selecionada

Imprime registro no formato completo
Factors affecting the use of forward pricing methods in price risk management with special reference to the influence of risk aversion AgEcon
Jordaan, Henry; Grove, Bennie.
Risk aversion is the primary reason for farmers to use forward pricing methods to hedge against price risk. Previous international research on farmers’ forward pricing behaviour found inconsistent results with respect to the relationship between risk aversion and the use of forward pricing methods. Ordinary Least Squares (OLS) regression is used in this research to investigate the relationship between the proportion of maize Vaalharts maize producers are willing to forward price and risk aversion. The quantity decision is modelled conditional on the adoption decision to ensure that the modelling procedure does not force the same variables to influence the two decisions in the same way. Regression results showed that more risk averse farmers are forward...
Tipo: Journal Article Palavras-chave: Forward pricing; Risk aversion; Farm characteristics; Linear regression; Crop Production/Industries; Marketing; Risk and Uncertainty.
Ano: 2008 URL: http://purl.umn.edu/5970
Imagem não selecionada

Imprime registro no formato completo
Analysis of quantitative traits using regression and log-linear modeling when phase is unknown AgEcon
Mander, Adrian P..
This function models the relationship between quantitative trait and the genotype of a person. It introduces a new syntax for model specification, which is necessary because when phase is unknown, the explanatory variables for the linear regression are never observed. The data must be a population-based sample because within family effects are not modeled.
Tipo: Journal Article Palavras-chave: Haplotype analysis; Association studies; Phase-unknown; Linear regression; Research Methods/ Statistical Methods.
Ano: 2002 URL: http://purl.umn.edu/115951
Imagem não selecionada

Imprime registro no formato completo
Review of Regression Methods in Biostatistics: Linear, Logistic, Survival, and Repeated Measures Models by Vittinghoff, Glidden, Shiboski, and McCulloch AgEcon
Lemeshow, Stanley; Moeschberger, Melvin L..
This article reviews Regression Methods in Biostatistics: Linear, Logistic, Survival, and Repeated Measures Models by Vittinghoff et al.
Tipo: Journal Article Palavras-chave: Linear regression; Logistic regression; Survival analysis; Repeated measures; Generalized linear models; Complex surveys; Research Methods/ Statistical Methods.
Ano: 2005 URL: http://purl.umn.edu/117518
Imagem não selecionada

Imprime registro no formato completo
A influência da exportação de açúcar no porto de Santos sobre o frete rodoviário do fertilizante no estado de São Paulo AgEcon
Antonio, Joao Paulo Gomes Rigueiral e; Carvalho, Leandro Bernardino de.
This survey has the purpose to prove as and how much the volume of exported sugar by Santos port interferes in the freight value negotiated for fertilizer distribution for the final customer, in São Paulo State. For people who are directly connected to fertilizer logistic, it is very important to have knowledge of how this variable impact in its market and so, it is possible to plan and make feasible differential logistic strategies to can provide more competitiveness for its business. Through statistics methodology, it is possible to observe and quantify the influence of main variable that has interference in the delivery road freight to the final customer. Based on this, it will be able to conclude that the logistic linking between sugar and fertilizer...
Tipo: Journal Article Palavras-chave: Agro-industrial logistic; Linear regression; Pearson's correlation; Distribution of fertilizer; Marketing.
Ano: 2007 URL: http://purl.umn.edu/54600
Imagem não selecionada

Imprime registro no formato completo
Marketing management capabilities of SMEs: an empirical analysis in the EU AgEcon
Banterle, Alessandro; Carraresi, Laura; Stranieri, Stefanella.
SMEs, that represent the greater part of European food firms producing traditional food products (TFPs), meet difficulties in adapting their strategies to market changes, and in competing with big enterprises. Marketing management capabilities play a key role in good SMEs performance in the market. The purpose of this paper is to evaluate the marketing capabilities of SMEs that produce TFPs. The theoretical framework considers the Market Orientation approach and marketing management capabilities in terms of marketing research, marketing strategy, planning and implementation, control and evaluation. A self evaluation tool was developed by means of an interactive questionnaire, available on the web, aimed at assessing traditional food firms competitive...
Tipo: Conference Paper or Presentation Palavras-chave: Marketing capabilities; SMEs; Traditional food; Linear regression; Agribusiness; Marketing.
Ano: 2008 URL: http://purl.umn.edu/44318
Imagem não selecionada

Imprime registro no formato completo
Selecting statistical models to study the relationship between soybean yield and soil physical properties Rev. Bras. Ciênc. Solo
Oliveira,Marcio Paulo de; Tavares,Maria Hermínia Ferreira; Uribe-Opazo,Miguel Angel; Timm,Luis Carlos.
Statistical models allow the representation of data sets and the estimation and/or prediction of the behavior of a given variable through its interaction with the other variables involved in a phenomenon. Among other different statistical models, are the autoregressive state-space models (ARSS) and the linear regression models (LR), which allow the quantification of the relationships among soil-plant-atmosphere system variables. To compare the quality of the ARSS and LR models for the modeling of the relationships between soybean yield and soil physical properties, Akaike's Information Criterion, which provides a coefficient for the selection of the best model, was used in this study. The data sets were sampled in a Rhodic Acrudox soil, along a spatial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Autocorrelation; Cross correlation; Linear regression; State-space model; Soil and plant properties.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000100009
Imagem não selecionada

Imprime registro no formato completo
Leaf area prediction models for Zinnia elegans Jacq., Zinnia haageana regel and 'profusion cherry' Scientia Agricola
Pinto,Ana Christina Rossini; Rodrigues,Teresinha de Jesus Deléo; Barbosa,José Carlos; Leite,Izabel Cristina.
Leaf area measurements are of value in physiological and agronomic studies. The use of prediction models to estimate leaf area is a simple, accurate and nondestructive method. The present work suggests leaf area prediction models for Zinnia elegans ('Liliput' and 'Thumbelina'), Z. haageana ('Carpet Persa') and Z. elegans x Z. angustifolia ('Profusion Cherry'), potential flower potplant cultivars. At the stages of visible apical flower bud and flowering, 250 and 300 leaves were collected from greenhouse grown plants, respectively, at each season (fall, winter, spring and summer), totaling 1,000 and 1,200 leaves, for each developmental stage. The maximum length (L), maximum width (W) and real leaf area (RLA) were measured with a Digital Image Analysis System...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Floriculture; Potted plants; Linear regression.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100009
Imagem não selecionada

Imprime registro no formato completo
Quantifying herbage mass on rotationally stocked palisadegrass pastures using indirect methods Scientia Agricola
Braga,Gustavo José; Pedreira,Carlos Guilherme Silveira; Herling,Valdo Rodrigues; Luz,Pedro Henrique de Cerqueira; Marchesin,Wilson Aparecido; Macedo,Felipe Barros.
Indirect, non-destructive methods for estimating herbage mass on pasture may help growers to better estimate herbage mass and manage the grazing process. The objective of this study was to evaluate two methods for estimating herbage mass on Marandu palisadegrass [Brachiaria brizantha (A. Rich.) Stapf] pastures, over two grazing seasons. The relationships between herbage mass and two indirect, non-destructive measurements (sward surface height - SSH and rising plate meter - RP) were analyzed via regression analysis. Mean determination coefficients (r²) for the regression models were 0.82 and 0.91 for RP and SSH, respectively. Time within season influenced both slope (b) and intercept (a) of the regression models in both methods. The change in model...
Tipo: Info:eu-repo/semantics/report Palavras-chave: Brachiaria brizantha; Sward surface height; Herbage allowance; Rising plate meter; Linear regression.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100018
Imagem não selecionada

Imprime registro no formato completo
Fitting a taper function to minimize the sum of absolute deviations Scientia Agricola
Silva,Lana Mirian Santos da; Rodriguez,Luiz Carlos Estraviz; Caixeta Filho,José Vicente; Bauch,Simone Carolina.
Multiple product inventories of forests require accurate estimates of the diameter, length and volume of each product. Taper functions have been used to precisely describe tree form, once they provide estimates for the diameter at any height or the height at any diameter. This study applied a goal programming technique to estimate the parameters of two taper functions to describe individual tree forms. The goal programming formulation generates parameters that minimize total absolute deviations (MOTAD). These parameters generated by the MOTAD method were compared to those of ordinary least squares (OLS) method. The analysis used a set of 178 trees cut from cloned eucalyptus plantations in the Southern part of the state of Bahia, Brazil. The values of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: MOTAD; Ordinary least squares; Goal programming; Linear regression.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500007
Registros recuperados: 21
Primeira ... 12 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional