Detalhes
Nome
José Machado da SilvaCluster
Redes de Sistemas InteligentesCargo
Investigador SéniorDesde
01 fevereiro 1991
Nacionalidade
PortugalCentro
Centro de Telecomunicações e MultimédiaContactos
+351222094299
jose.m.silva@inesctec.pt
2020
Autores
Siqueira, JM; Paco, TA; da Silva, JM; Silvestre, JC;
Publicação
Sensors (Switzerland)
Abstract
The Biot-Granier (Gbt) is a new thermal dissipation-based sap flow measurement methodology, comprising sensors, data management and automatic data processing. It relies on the conventional Granier (Gcv) methodology upgraded with a modified Granier sensor set, as well as on an algorithm to measure the absolute temperatures in the two observation points and perform the Biot number approach. The work described herein addresses the construction details of the Gbt sensors and the characterization of the overall performance of the Gbt method after comparison with a commercial sap flow sensor and independent data (i.e., volumetric water content, vapor pressure deficit and eddy covariance technique). Its performance was evaluated in three trials: potted olive trees in a greenhouse and two vineyards. The trial with olive trees in a greenhouse showed that the transpiration measures provided by the Gbt sensors showed better agreement with the gravimetric approach, compared to those provided by the Gcv sensors. These tended to overestimate sap flow rates as much as 4 times, while Gbt sensors overestimated gravimetric values 1.5 times. The adjustments based on the Biot equations obtained with Gbt sensors contribute to reduce the overestimates yielded by the conventional approach. On the other hand, the heating capacity of the Gbt sensor provided a minimum of around 7? C and maximum about 9? C, contrasting with a minimum around 6? C and a maximum of 12? C given by the Gcv sensors. The positioning of the temperature sensor on the tip of the sap flow needle proposed in the Gbt sensors, closer to the sap measurement spot, allow to capture sap induced temperature variations more accurately. This explains the higher resolution and sensitivity of the Gbt sensor. Overall, the alternative Biot approach showed a significant improvement in sap flow estimations, contributing to adjust the Granier sap flow index, a vulnerability of that methodology. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
2020
Autores
Derogarian Miyandoab, FD; Canas Ferreira, JC; Grade Tavares, VMG; Machado da Silva, JM; Velez, FJ;
Publicação
IEEE/ACM Transactions on Networking
Abstract
2020
Autores
Silva, JMD; Cerrone, I; Malagon, D; Marinho, J; Mundy, S; Gaspar, J; Mendes, JG;
Publicação
2020 23rd Euromicro Conference on Digital System Design (DSD)
Abstract
2019
Autores
Machado da Silva, J; Derogarian, F; Canas Ferreira, J; Grade Tavares, V;
Publicação
Wearable Technologies and Wireless Body Sensor Networks for Healthcare
Abstract
2019
Autores
Derogarian, F; Canas Ferreira, J; Grade Tavares, V; Machado da Silva, J; Velez, FJ;
Publicação
Wearable Technologies and Wireless Body Sensor Networks for Healthcare
Abstract
Teses supervisionadas
2019
Autor
Raquel Sofia Remoaldo Vaz
Instituição
UP-FEUP
2019
Autor
Marisa Alexandra Pinto Alves
Instituição
UP-FEUP
2018
Autor
José Diogo Queiroz de Athayde Agorreta de Alpuim
Instituição
UP-FEUP
2018
Autor
JUCILENE DE MEDEIROS SIQUEIRA
Instituição
IES_Outra
2018
Autor
Beatriz Alves Pereira
Instituição
UP-FEUP
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