Instituto de Telecomunicações

Ultrasonic Guided Wave Localization and Classification of Damage-like Perturbations in a CFRP Plate Using a PZT Network

Ultrasonic guided waves acquired using permanently bonded piezoelectric transducers enable large-area monitoring of composite structures. For practical structural health monitoring; however, both the location and the condition of a structural change are critical. This paper prese...

The Contribution of DAS to the Routine Monitoring of Seismicity in Oceanic Islands: The Case for Faial (Azores)

Distributed acoustic sensing (DAS) deployed on submarine telecom cables is bound to revolutionize the earthquake monitoring routine currently performed by seismic network operators, particularly in domains where most seismic activity originates offshore. In this work, we analyze...

LUSITANOv2: A Real-World Dataset for Fabric Defect Detection in Active Textile Production

Reliable fabric inspection is difficult to automate because production-line imagery differs substantially from the controlled samples used by many public benchmarks. This paper introduces LUSITANOv2, a high-resolution fabric-defect dataset collected at an active textile inspectio...

Event-triggered neural network adaptive hybrid attitude control

In this paper, we develop an adaptive controller for rigid-body attitude tracking systems that combines a neural network architecture with an event-triggered mechanism. We design a quaternion-based nonlinear controller that employs a neural network to compensate for state-based d...

Amazon Forgotten Fishes. How the remarkable diversity of freshwater fishes is critical to people, rivers and forest

Across the vast sweep of the Amazon Basin, thousands of rivers, streams and floodplain lakes flow in an immense, interconnected waterscape— home to an unparalleled diversity of freshwater fishes. More than 2,700 species have so far been recorded, with dozens more added each year...

Highly Stretchable Eu 3+ ‐ Doped PEBAX Elastomers With Complementary Optical Readouts of Strain and Temperature

ABSTRACT Soft photonic materials capable of maintaining optical functionality under large mechanical deformation are highly desirable for wearable photonics, flexible sensors, optical and mechanically adaptive photonic systems. Here, we report highly stretchable luminescent elast...

A&M based fractional delay and Doppler channel estimation in OTFS

Orthogonal time frequency space (OTFS) modulation is a candidate for low-density high-mobility communication (LDHMC) use case in sixth generation (6G) due to its robustness against Doppler effects. This paper presents a low-complexity channel estimation method based on the A&M fr...