| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Instrumentação. |
|
Data corrente: |
01/02/2001 |
|
Data da última atualização: |
24/08/2010 |
|
Autoria: |
BERTUCCI-NETO, V.; PESSOA, J. D. C.; CRUVINEL, P. E.; CALBO, A. G. |
|
Afiliação: |
Embrapa Instrumentacao Agropecuaria. |
|
Título: |
Control systems-based design of a plant intracellular pressure measurement instrument. |
|
Ano de publicação: |
1999 |
|
Fonte/Imprenta: |
In: MASTORAKIS, N. E. (Ed.). Computers and computational engineering in control. [Athens]: World Scientific and Engineering Society, 1999. |
|
Páginas: |
p. 199-203. |
|
ISBN: |
960-8052-12-2 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Cell turgor (plant intracellular pressure) is a parameter very know by physiologists and its determination is fundamental for the evaluation of water relations of higher (multicellular) plants. It is largely used in studies of plant tolerance or resistance to various stresses caused by irregular supply of nutrients, water and some other factors required by plant organism. The determination of cell turgor is also important for the development of models for water transport in plant tissues. Although this matter is of great importance to the physiologists, there are a few papers discribing realistic techniques for this purpose. Basically, the most reliable developed devices consisted of capillary filled with oil. It was used to puncture a plant cell and the meniscus moved itself according to the intracellular pressure. A hydraulic apparatus driven by a DC motor was used for counteracting the cell fissure, impelling pressure in the sense of the plant cell. The effort dispensed by the motor was correlated with the cell pressure. In a previous paper we have applied by the first time a control system approach to this problem. It was possible to determine the feasible work ranges, stability conditions, performance. The hydraulic system plus the DC motor was changed by external controlled temperature acting over the capillary wall. However the meniscus position detection was exposed to ambient temperature causing noisy measurement. In order to overcome this problem we propose in this paper a new design based on Linear Quadratic methods, specifically Proportional plus Integral Estimators in conjunction with Proportional Plus Integral State Feedback Regulator Designs. Main idea is to profit by the robustness characteristics of a PI controller together with the setting of the filter bandwidths for good noise filtering and transient responses. Morover, PI estimator can be optimum for a plant process noise which is high in intensity at low frequencies. The system was modeled and simulations were performed using parameters in limit conditions either of stability, or performance. Even in these conditions the response showed high robustness due to large plant parameters variations and a reasonable noise filtering. Responses fails when the dead time, due to sample-hold circuits,optical sensor, and computer tasks, is increased. Limiting value found for the parameter was 0.2 second. It is sufficient to degenerate the system performance. Implications in to lower the dead time are related to rising the costs of the instrument. More expressive results are outlined in graphics followed by discussions. MenosCell turgor (plant intracellular pressure) is a parameter very know by physiologists and its determination is fundamental for the evaluation of water relations of higher (multicellular) plants. It is largely used in studies of plant tolerance or resistance to various stresses caused by irregular supply of nutrients, water and some other factors required by plant organism. The determination of cell turgor is also important for the development of models for water transport in plant tissues. Although this matter is of great importance to the physiologists, there are a few papers discribing realistic techniques for this purpose. Basically, the most reliable developed devices consisted of capillary filled with oil. It was used to puncture a plant cell and the meniscus moved itself according to the intracellular pressure. A hydraulic apparatus driven by a DC motor was used for counteracting the cell fissure, impelling pressure in the sense of the plant cell. The effort dispensed by the motor was correlated with the cell pressure. In a previous paper we have applied by the first time a control system approach to this problem. It was possible to determine the feasible work ranges, stability conditions, performance. The hydraulic system plus the DC motor was changed by external controlled temperature acting over the capillary wall. However the meniscus position detection was exposed to ambient temperature causing noisy measurement. In order to overcome this problem we propose in this... Mostrar Tudo |
|
Palavras-Chave: |
Agricultural instrumentation; Controlador PI; Instrumentacao agropecuaria; LQG; LQR; Medida; Pressao intracelular; Pressure probe. |
|
Thesaurus Nal: |
measurement; turgor. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 03531naa a2200301 a 4500
001 1027336
005 2010-08-24
008 1999 bl uuuu u00u1 u #d
020 $a960-8052-12-2
100 1 $aBERTUCCI-NETO, V.
245 $aControl systems-based design of a plant intracellular pressure measurement instrument.
260 $c1999
300 $ap. 199-203.
520 $aCell turgor (plant intracellular pressure) is a parameter very know by physiologists and its determination is fundamental for the evaluation of water relations of higher (multicellular) plants. It is largely used in studies of plant tolerance or resistance to various stresses caused by irregular supply of nutrients, water and some other factors required by plant organism. The determination of cell turgor is also important for the development of models for water transport in plant tissues. Although this matter is of great importance to the physiologists, there are a few papers discribing realistic techniques for this purpose. Basically, the most reliable developed devices consisted of capillary filled with oil. It was used to puncture a plant cell and the meniscus moved itself according to the intracellular pressure. A hydraulic apparatus driven by a DC motor was used for counteracting the cell fissure, impelling pressure in the sense of the plant cell. The effort dispensed by the motor was correlated with the cell pressure. In a previous paper we have applied by the first time a control system approach to this problem. It was possible to determine the feasible work ranges, stability conditions, performance. The hydraulic system plus the DC motor was changed by external controlled temperature acting over the capillary wall. However the meniscus position detection was exposed to ambient temperature causing noisy measurement. In order to overcome this problem we propose in this paper a new design based on Linear Quadratic methods, specifically Proportional plus Integral Estimators in conjunction with Proportional Plus Integral State Feedback Regulator Designs. Main idea is to profit by the robustness characteristics of a PI controller together with the setting of the filter bandwidths for good noise filtering and transient responses. Morover, PI estimator can be optimum for a plant process noise which is high in intensity at low frequencies. The system was modeled and simulations were performed using parameters in limit conditions either of stability, or performance. Even in these conditions the response showed high robustness due to large plant parameters variations and a reasonable noise filtering. Responses fails when the dead time, due to sample-hold circuits,optical sensor, and computer tasks, is increased. Limiting value found for the parameter was 0.2 second. It is sufficient to degenerate the system performance. Implications in to lower the dead time are related to rising the costs of the instrument. More expressive results are outlined in graphics followed by discussions.
650 $ameasurement
650 $aturgor
653 $aAgricultural instrumentation
653 $aControlador PI
653 $aInstrumentacao agropecuaria
653 $aLQG
653 $aLQR
653 $aMedida
653 $aPressao intracelular
653 $aPressure probe
700 1 $aPESSOA, J. D. C.
700 1 $aCRUVINEL, P. E.
700 1 $aCALBO, A. G.
773 $tIn: MASTORAKIS, N. E. (Ed.). Computers and computational engineering in control. [Athens]: World Scientific and Engineering Society, 1999.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Instrumentação (CNPDIA) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 154 | |
| 63. |  | BERTUCCI-NETO, V.; FONSECA, R. F.; FRANCISCO, R. A.; FARINAS, C. S.; COURI, S. Controle de fluxo e umidade de ar para processos de produção de celulases. In: CONGRESSO BRASILEIRO SOBRE FLORESTAS ENERGÉTICAS, 1., 2009, Belo Horizonte. Anais. Colombo: Embrapa Florestas, 2009. 1 CD-ROM. (Embrapa Florestas. Documentos, 178). Seção: Derivados Energéticos de Alto Valor Agregado.| Biblioteca(s): Embrapa Florestas. |
|   |
| 64. | | BERTUCCI-NETO, V.; FONSECA, R. F.; FRANCISCO, R. A.; FARINAS, C. S.; COURI, S. Controle de fluxo e umidade de ar para processos de produção de celulases. In: CONGRESSO BRASILEIRO SOBRE FLORESTAS ENERGÉTICAS, 1., 2009, Belo Horizonte. Anais... Colombo: Embrapa Florestas, 2009. 1 CD-ROM. (Embrapa Florestas. Documentos, 178).| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Agroindústria de Alimentos. |
| |
| 68. | | BERTUCCI-NETO, V.; PESSOA, J. D. C.; CRUVINEL, P. E.; CALBO, A. G. Control systems-based design of a plant intracellular pressure measurement instrument. In: WORLD MULTICONFERENCE ON: CIRCUITS, SYSTEMS, COMMUNICATIONS AND COMPUTERS (IEEE/WSES/IMACS)-CSCC, 3., 1999, Athens, Grécia. CSCC'99: proceedings... [Athens]: World Scientific and Engineering Society, 1999. p.6231-6236, ref.623. Editor Nikos E. Mastorakis. Dedicated to the father of fuzzy logic: L. Zadeh. 1 CD-ROM.| Biblioteca(s): Embrapa Instrumentação. |
| |
| 72. | | MOITAS, M. L.; FARINAS, C. S.; BERTUCCI NETO, V.; COURI, S. Caracterização do extrato de enzimas hidrolíticas produzido por fermentação semi-sólida. In: JORNADA DE INICIAÇÃO CIENTÍFICA E TECNOLÓGICA; CONGRESSO DE INICIAÇÃO CIENTÍFICA, 16.; CONGRESSO DE INICIAÇÃO EM DESENVOLVIMENTO TECNOLÓGICO E INOVAÇÃO, 1., 2008, São Carlos, SP. Anais de Eventos da UFSCar... São Carlos: UFSCar, 2008. v. 4 p. 176. Resumo.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
|  |
| 73. | | FONSECA, R. F.; MELO, C. B.; FARINAS, C. S.; KWONG, W. H.; BERTUCCI NETO, V. Avanços no desenvolvimento da instrumentação e controle da fermentação em estado sólido. In: SIMPÓSIO NACIONAL DE INSTRUMENTAÇÃO AGROPECUÁRIA, 2014, São Carlos, SP Anais do SIAGRO: ciência, inovação e mercado 2014. São Carlos, SP: Embrapa Instrumentação, 2014. p. 569-572. Editores: Carlos Manoel Pedro Vaz, Débora Marcondes Bastos Pereira Milori, Silvio Crestana. Entrada padronizada BERTUCCI-NETO, V.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
|  |
| 77. | | VITCOSQUE, G. L.; FARINAS, C. S.; FONSECA, R. F.; BERTUCCI NETO, V. Improving cellulolytic enzyme production using sugarcane bagasse in a solid-state fermentation bioreactor. Holos environment, Rio Claro, v. 11, n. 1, p. 103, 2011. Supl. 1. Edição dos resumos do 5 Simpósio de Microbiologia Aplicada, Rio Claro, maio 2011.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 4 |
| Biblioteca(s): Embrapa Instrumentação. |
| |
| 80. | | BERTUCCI NETO, V.; FONSECA, R. F.; FARINAS, C. S.; RAMOS, R. A. Instrumentação para processos de fermentação sólida visando à produção de enzimas. In: SIMPÓSIO SOBRE INOVAÇÃO E CRIATIVIDADE CIENTÍFICA NA EMBRAPA, 2., 2010, Brasília, DF. Comunicações... Brasília, DF: Embrapa, 2010.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Instrumentação. |
| |
| Registros recuperados : 154 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
