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	Provedor de dados AgEcon (1) REA (1) Rev. Bras. Ciênc. Solo (1) Autor Abreu,Francisco Manuel Gonçalves de (1) Andrade,José Alexandre Varanda (1) Antonini,Jorge C. dos A. (1) Cader, Hanas A. (1) Featherstone, Allen M. (1) Griebeler,Nori P. (1) Madeira,Manuel Armando Valeriano (1) Sano,Edson E. (1) Silva,Euzebio M. da (1) Mais... Palavra-chave Fourier series (3) Base temperature (1) Cost function (1) Damping depth (1) Flexible functional form (1) Growing degree-days (1) Markov Chain Monte Carlo (1) Research Methods/ Statistical Methods (1) Soil temperature (1) Thermal requirement (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Conference Paper or Presentation (1) Ano 2011 (1) 2010 (1) 2005 (1) País Brazil (2) United States (1) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Spatio-temporal modelling of the duration of the cotton cycle in the State Of Goiás, Brazil REA Antonini,Jorge C. dos A.; Silva,Euzebio M. da; Griebeler,Nori P.; Sano,Edson E.. The objective of this work was to develop and validate a mathematical model to estimate the duration of cotton (Gossypium hirsutum L. r. latifolium hutch) cycle in the State of Goiás, Brazil, by applying the method of growing degree-days (GD), and considering, simultaneously, its time-space variation. The model was developed as a linear combination of elevation, latitude, longitude, and Fourier series of time variation. The model parameters were adjusted by using multiple-linear regression to the observed GD accumulated with air temperature in the range of 15°C to 40°C. The minimum and maximum temperature records used to calculate the GD were obtained from 21 meteorological stations, considering data varying from 8 to 20 years of observation. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Growing degree-days; Base temperature; Thermal requirement; Fourier series. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000400004 Bayesian Inferences on Fourier Flexible Functional Form in Agricultural Production AgEcon Featherstone, Allen M.; Cader, Hanas A.. Flexible functional forms are used to examine the characteristics of production technologies. The Fourier functional form is capable of approximating any function globally, with the specified expansion. Unfortunately the exact form of the expansion is not known. The regularity conditions are likely to be violated without the exact form of expansion. In this paper we use a Bayesian approach to impose regularity conditions locally on a Fourier flexible functional from using agricultural production data. Monotonicity, concavity, convexity and elasticities are compared. Tipo: Conference Paper or Presentation Palavras-chave: Cost function; Flexible functional form; Fourier series; Markov Chain Monte Carlo; Research Methods/ Statistical Methods. Ano: 2005 URL: http://purl.umn.edu/19228 Influence of litter layer removal on the soil thermal regime of a pine forest in a mediterranean climate Rev. Bras. Ciênc. Solo Andrade,José Alexandre Varanda; Abreu,Francisco Manuel Gonçalves de; Madeira,Manuel Armando Valeriano. The removal of the litter layer in Portuguese pine forests would reduce fire hazard, but on the other hand this practice would influence the thermal regime of the soil, hence affecting soil biological activity, litter decomposition and nutrient dynamics. Temperature profiles of a sandy soil (Haplic Podzol) under a pine forest were measured with thermocouples at depths to 16 cm, with and without litter layer. The litter layer acted as a thermal insulator, reducing the amplitude of the periodic temperature variation in the mineral soil underneath and increasing damping depths, particularly at low soil water contents. At the mineral soil surface the reduction of amplitudes was about 2.5 ºC in the annual cycle and 5 to 6.7 ºC in the daily cycle, depending on... Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil temperature; Fourier series; Damping depth. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500001 Registros recuperados: 3 Primeira ... 1 ... Última

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