25 documents found, page 1 of 3

Anti-icing coatings for asphalt mixtures using sprayed hierarchical nano/micro-...

In cold regions, icy roads cause hazards that extend beyond accidents, impacting communities and escalating air pollution during congestions. To reduce the risk of road accidents caused by ice formation on the pavement surface, new coatings have been developed to create superhydrophobic asphalt mixtures to avoid this issue. This study investigated the effect of two successive spraying coatings applied over an a...

MuscLab: a flexible and elastic e-textile band for monitoring muscle contraction

Mecanomyographic (MMG) and force myography (FMG) sensors emerged as an alternative to electromyography (EMG) for monitoring muscle contraction without requiring the direct contact of the sensor with the user’s skin. Nonetheless, most of the available sensors 1) require as many sensors as there are muscles to monitor, resulting in a time-consuming preparation for practical use and 2) present a nonelastic nature,...

Real-time control of ankle orthosis assistance using a locomotion mode predicti...

Robotic assistive devices have been equipped with locomotion mode (LM) decoding tools to adapt their assistance according to the user’s locomotion needs. However, most of the LM decoding tools are insufficient to predict the upcoming LM in advance; and do not consider the typically slow speeds of neurologically impaired users. This study aims to address these shortcomings by introducing an LM decoding tool to p...

Assist-as-needed electromyography-based control for a wearable ankle robotic or...

The challenge of addressing the critical public health issue of lower limb disability has led to the exploration of robotic assistive devices for rehabilitation, as a complement to conventional therapies. However, achieving optimal synergy between robotic activity and human effort remains a persistent challenge. Even the optimal control of Assist-as-Needed (AAN) remains to be solved. This study addresses this c...

Mitigation of urban heat island effects by thermochromic asphalt pavement

Asphalt road pavements are usually dark and, consequently, have a low albedo. Therefore, they absorb energy as heat, increasing the Urban Heat Island (UHI) effect, which impacts the environment, energy consumption, and human health. Through the functionalization with thermochromic materials (TM), this work aims to develop a smart asphalt pavement able to change its surface color, increasing the reflectance, and...

A review on locomotion mode recognition and prediction when using active orthos...

Understanding how to seamlessly adapt the assistance of lower-limb wearable assistive devices (active orthosis (AOs) and exoskeletons) to human locomotion modes (LMs) is challenging. Several algorithms and sensors have been explored to recognize and predict the users’ LMs. Nevertheless, it is not yet clear which are the most used and effective sensor and classifier configurations in AOs/exoskeletons and how the...

Properties of the tert-butyl halide solvolysis transition states

We have obtained properties (or descriptors) of the transition states in the solvolysis of tert-butyl chloride, bromide and iodide. We show that all three transition states, in both protic and in aprotic solvents, are highly dipolar and are strong hydrogen bond acids and strong hydrogen bond bases, except for the tert-butyl iodide transition state in aprotic solvents, which has a rather low hydrogen bond acidit...

AI-based reference ankle joint torque trajectory generation for robotic gait as...

Robotic-based gait rehabilitation and assistance have been growing to augment and to recover motor function in subjects with lower limb impairments. There is interest in developing user-oriented control strategies to provide personalized assistance. However, it is still needed to set the healthy user-oriented reference joint trajectories, namely, reference ankle joint torque, that would be desired under healthy...

A quarta revolução industrial no setor metalomecânico português

Quantifying solvent effects through QSPR: A new look over different model equat...

The heterolysis reactions of 3 tertiary alkyl halides (2-chloro-2-methylpropane, 2-bromo-2-methylpropane and 3-bromo-3-ethylpentane) in a set of 21 protic and aprotic solvents, representative of various classes of solvents, were used to study solvent effects upon reactivity, at 298.15 K. Quantitative Structure-Property Relationships established through the use of multiple linear regressions, namely a model equa...