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About

José Machado da Silva obtained a PhD degree on electrical and computer engineering in 1998 and is currently an Associated Professor at the Faculty of Engineering of the University of Porto, and a Senior Researcher at INESC Porto. His teaching and research interests include analogue, mixed-signal, and RF VLSI design and test, signal processing, and biomedical electronics.

Interest
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Details

Details

006
Publications

2020

Biot-granier sensor: A novel strategy to measuring sap flow in trees

Authors
Siqueira, JM; Paco, TA; da Silva, JM; Silvestre, JC;

Publication
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

A Multifunctional Integrated Circuit Router for Body Area Network Wearable Systems

Authors
Derogarian Miyandoab, FD; Canas Ferreira, JC; Grade Tavares, VMG; Machado da Silva, JM; Velez, FJ;

Publication
IEEE/ACM Transactions on Networking

Abstract

2020

An Active Implant to Restore Dental Proprioceptivity

Authors
Silva, JMd; Cerrone, I; Malagon, D; Marinho, J; Mundy, S; Gaspar, J; Mendes, JG;

Publication
2020 23rd Euromicro Conference on Digital System Design (DSD)

Abstract

2019

Wearable sensor networks for human gait

Authors
Machado da Silva, J; Derogarian, F; Canas Ferreira, J; Grade Tavares, V;

Publication
Wearable Technologies and Wireless Body Sensor Networks for Healthcare

Abstract

2019

A precise low power and hardware-efficient time synchronization method for wearable systems

Authors
Derogarian, F; Canas Ferreira, J; Grade Tavares, V; Machado da Silva, J; Velez, FJ;

Publication
Wearable Technologies and Wireless Body Sensor Networks for Healthcare

Abstract

Supervised
thesis

2019

Direct Stimulation for Ligament Regeneration

Author
Raquel Sofia Remoaldo Vaz

Institution
UP-FEUP

2019

A Wearable System for Remote Cardiorespiratory Fitness Monitoring

Author
Marisa Alexandra Pinto Alves

Institution
UP-FEUP

2018

Sistema de Controlo Inferencial com Dispositivos Sensoriais Direcionados para o Uso Eficiente da Água na Agricultura

Author
JUCILENE DE MEDEIROS SIQUEIRA

Institution
IES_Outra

2018

Dental Pressure Detection and Nerve Stimulation Demonstration Prototype

Author
Beatriz Alves Pereira

Institution
UP-FEUP

2018

Monitoring of Health by Means of Saliva Testing

Author
Bárbara Marques

Institution
UP-FEUP