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Navegando por Autor Oliveira, Carlos Alberto da Silva
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- Silva, Cícero Lopes da; Oliveira, Carlos Alberto da SilvaOliveira Júnior, Manuel Pereira de26-Jan-2010★★★★★ (0)
- Silva, Cícero Lopes da; Oliveira, Carlos Alberto da SilvaOliveira Júnior, Manuel Pereira de26-Jan-2010★★★★★ (0)
- Boschin, Ana Paula Masson; Silva, Cicero Lopes da; Oliveira, Carlos Alberto da Silva; Oliveira Júnior, Manuel Pereira de; Miranda, Martha Zavariz de; Fagioli, Marcelo8-Jun-2011★★★★★ (0)
- Boschin, Ana Paula Masson; Silva, Cicero Lopes da; Oliveira, Carlos Alberto da Silva; Oliveira Júnior, Manuel Pereira de; Miranda, Martha Zavariz de; Fagioli, Marcelo8-Jun-2011★★★★★ (0)
- The objective of this work was to estimate Angström-Prescott equation mean coefficients in Brasília, DF, Brazil, and their effects on the calculations of global radiation (Rs) and reference crop evapotranspiration (ETo). It was used meteorological data from Embrapa Hortaliças weather station, from 1978 to 2003. The mean coefficients were determined by linear regression analysis considering monthly, annual and total periods. Using the calculated coefficients for different periods and those provided by FAO (0.25 and 0.50), Rs and ETo were estimated and their performances were evaluated. Monthly mean coefficient a varied from 0.241 to 0.345, and b from 0.430 to 0.515. Annual mean coefficients a and b were 0.278 and 0.498, and total means were 0.282 and 0.490, respectively. These coefficients did not differ from each other on radiation estimates. The month of July provided the worse estimates and performance. When using calculated Rs estimates with monthly, annual, total and FAO coefficients, estimated values of ETo did not differ from observed ones, providing excellent performance, despite the mean coefficient used. Depending on the final application, it is suggested the use of total mean coefficients due to their easiness to estimate the shortwave radiation.Dornelas, Karla Daniele e Silva; Silva, Cícero Lopes da; Oliveira, Carlos Alberto da Silva30-Mai-2011★★★★★ (0)
- The objective of this work was to estimate Angström-Prescott equation mean coefficients in Brasília, DF, Brazil, and their effects on the calculations of global radiation (Rs) and reference crop evapotranspiration (ETo). It was used meteorological data from Embrapa Hortaliças weather station, from 1978 to 2003. The mean coefficients were determined by linear regression analysis considering monthly, annual and total periods. Using the calculated coefficients for different periods and those provided by FAO (0.25 and 0.50), Rs and ETo were estimated and their performances were evaluated. Monthly mean coefficient a varied from 0.241 to 0.345, and b from 0.430 to 0.515. Annual mean coefficients a and b were 0.278 and 0.498, and total means were 0.282 and 0.490, respectively. These coefficients did not differ from each other on radiation estimates. The month of July provided the worse estimates and performance. When using calculated Rs estimates with monthly, annual, total and FAO coefficients, estimated values of ETo did not differ from observed ones, providing excellent performance, despite the mean coefficient used. Depending on the final application, it is suggested the use of total mean coefficients due to their easiness to estimate the shortwave radiation.Dornelas, Karla Daniele e Silva; Silva, Cícero Lopes da; Oliveira, Carlos Alberto da Silva30-Mai-2011★★★★★ (0)
- Lima, Jorge Enoch Furquim Werneck; Silva, Cícero Lopes da; Oliveira, Carlos Alberto da Silva31-Mai-2011★★★★★ (0)
- Lima, Jorge Enoch Furquim Werneck; Silva, Cícero Lopes da; Oliveira, Carlos Alberto da Silva31-Mai-2011★★★★★ (0)
- Oliveira, Carlos Alberto da SilvaMera, Ana Carolina8-Mar-2010★★★★★ (0)
- Oliveira, Carlos Alberto da SilvaMera, Ana Carolina8-Mar-2010★★★★★ (0)
- Alencar, Danielle B. S. de; Silva, Cícero Lopes da; Oliveira, Carlos Alberto da Silva30-Mai-2011★★★★★ (0)
- Alencar, Danielle B. S. de; Silva, Cícero Lopes da; Oliveira, Carlos Alberto da Silva30-Mai-2011★★★★★ (0)
- Pinto, Jacques M.; Silva, Cícero Lopes da; Oliveira, Carlos Alberto da Silva27-Mai-2011★★★★★ (0)
- Pinto, Jacques M.; Silva, Cícero Lopes da; Oliveira, Carlos Alberto da Silva27-Mai-2011★★★★★ (0)
- Oliveira, Carlos Alberto da SilvaEvangelista, William1-Dez-2009★★★★★ (0)
- Oliveira, Carlos Alberto da SilvaEvangelista, William1-Dez-2009★★★★★ (0)
- Oliveira, Carlos Alberto da SilvaGrenho, Ana Isabel Santos1-Dez-2009★★★★★ (0)
- Oliveira, Carlos Alberto da SilvaGrenho, Ana Isabel Santos1-Dez-2009★★★★★ (0)
- Liz, Ronaldo Setti de; Calbo, Adonai Gimenez; Carrijo, Osmar Alves; Oliveira, Carlos Alberto da Silva6-Jun-2011★★★★★ (0)
- Liz, Ronaldo Setti de; Calbo, Adonai Gimenez; Carrijo, Osmar Alves; Oliveira, Carlos Alberto da Silva6-Jun-2011★★★★★ (0)