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Registro Completo |
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Biblioteca(s): |
Embrapa Agroindústria Tropical. |
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Data corrente: |
09/11/2006 |
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Data da última atualização: |
16/06/2017 |
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Autoria: |
MIRANDA, F. R. de. |
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Título: |
A distributed control system for priority-based site-specific irrigation. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
2003. 137 f. |
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Idioma: |
Inglês |
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Notas: |
Doctor of Philosophy Thesis (Biosystems Engineering) - University of Tennessee, Knoxville. |
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Conteúdo: |
Site-specific irrigation enables maximizing yields and water use efficiency for fields with
variation in soil water availability. Distributed control for fixed irrigated systems, with
controIlers cIose to the sensors and actuators in the field, is easier to instaIl and maintain,
and less susceptible to damage by lightning strikes compared to centralized control, but is
only economicaIly viable with affordable, low-power controIlers. A low cost, solar
powered, feedback irrigation controIler for distributed control of fixed irrigation systems
was developed and tested. The system used soil water potential measurements to control
the amount of water applied to each specific zone of a field. Priority scheduling and
hydraulic pressure measurements were used to aIlocate water resources among irrigation
controIlers. Each irrigation controlIer was autonomously powered, minimizing
maintenance and eliminating hard-wire connections among control units. The study
methodology involved system design (hardware and software), experimental
implementation, performance evaluation, and power supply optimization. The irrigation
controIler proved to be effective in maintaining the soil water potential in the root zone
cIose to a predetermined set point. Performance of the priority scheduling approach for
water aIlocation among the irrigation controlIers was satisfactory, with irrigation of
management zones always occurring according to the priority rank, and under adequate
operating pressure. Advantages of the control system compared to centralized control
systems incIude significant reduction in wiring costs, lower risk of system shut down, and
higher flexibility. MenosSite-specific irrigation enables maximizing yields and water use efficiency for fields with
variation in soil water availability. Distributed control for fixed irrigated systems, with
controIlers cIose to the sensors and actuators in the field, is easier to instaIl and maintain,
and less susceptible to damage by lightning strikes compared to centralized control, but is
only economicaIly viable with affordable, low-power controIlers. A low cost, solar
powered, feedback irrigation controIler for distributed control of fixed irrigation systems
was developed and tested. The system used soil water potential measurements to control
the amount of water applied to each specific zone of a field. Priority scheduling and
hydraulic pressure measurements were used to aIlocate water resources among irrigation
controIlers. Each irrigation controlIer was autonomously powered, minimizing
maintenance and eliminating hard-wire connections among control units. The study
methodology involved system design (hardware and software), experimental
implementation, performance evaluation, and power supply optimization. The irrigation
controIler proved to be effective in maintaining the soil water potential in the root zone
cIose to a predetermined set point. Performance of the priority scheduling approach for
water aIlocation among the irrigation controlIers was satisfactory, with irrigation of
management zones always occurring according to the priority rank, and under adequate
operating pressure. Adva... Mostrar Tudo |
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Thesagro: |
Irrigação. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02103nam a2200133 a 4500
001 1426298
005 2017-06-16
008 2003 bl uuuu m 00u1 u #d
100 1 $aMIRANDA, F. R. de
245 $aA distributed control system for priority-based site-specific irrigation.
260 $a2003. 137 f.$c2003
500 $aDoctor of Philosophy Thesis (Biosystems Engineering) - University of Tennessee, Knoxville.
520 $aSite-specific irrigation enables maximizing yields and water use efficiency for fields with variation in soil water availability. Distributed control for fixed irrigated systems, with controIlers cIose to the sensors and actuators in the field, is easier to instaIl and maintain, and less susceptible to damage by lightning strikes compared to centralized control, but is only economicaIly viable with affordable, low-power controIlers. A low cost, solar powered, feedback irrigation controIler for distributed control of fixed irrigation systems was developed and tested. The system used soil water potential measurements to control the amount of water applied to each specific zone of a field. Priority scheduling and hydraulic pressure measurements were used to aIlocate water resources among irrigation controIlers. Each irrigation controlIer was autonomously powered, minimizing maintenance and eliminating hard-wire connections among control units. The study methodology involved system design (hardware and software), experimental implementation, performance evaluation, and power supply optimization. The irrigation controIler proved to be effective in maintaining the soil water potential in the root zone cIose to a predetermined set point. Performance of the priority scheduling approach for water aIlocation among the irrigation controlIers was satisfactory, with irrigation of management zones always occurring according to the priority rank, and under adequate operating pressure. Advantages of the control system compared to centralized control systems incIude significant reduction in wiring costs, lower risk of system shut down, and higher flexibility.
650 $aIrrigação
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Registro original: |
Embrapa Agroindústria Tropical (CNPAT) |
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Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
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Registro |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Meio-Norte. Para informações adicionais entre em contato com cpamn.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
18/01/1999 |
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Data da última atualização: |
31/08/2009 |
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Autoria: |
CARVALHO, J. H. de; RAMOS, G. M. |
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Afiliação: |
EMBRAPA-UEPAE de Teresina. |
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Título: |
Produtividade da faveira (Parkya platycephala Benth.) em tres municipios piauienses. |
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Ano de publicação: |
1983 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE FORRAGEIRAS E PASTAGENS NATIVAS, 1., 1983, Olinda-PE. Resumos... Recife: IPA/EMBRAPA, 1983. p. 44. |
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Idioma: |
Português |
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Palavras-Chave: |
Brasil; Piaui. |
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Thesagro: |
Faveira; Produtividade. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00550naa a2200169 a 4500
001 1050484
005 2009-08-31
008 1983 bl uuuu u00u1 u #d
100 1 $aCARVALHO, J. H. de
245 $aProdutividade da faveira (Parkya platycephala Benth.) em tres municipios piauienses.
260 $c1983
650 $aFaveira
650 $aProdutividade
653 $aBrasil
653 $aPiaui
700 1 $aRAMOS, G. M.
773 $tIn: CONGRESSO BRASILEIRO DE FORRAGEIRAS E PASTAGENS NATIVAS, 1., 1983, Olinda-PE. Resumos... Recife: IPA/EMBRAPA, 1983. p. 44.
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