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Browsing by Issue Date, starting with "2017-12-28"

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  • H-1 NMR relaxometry and diffusometry study of magnetic and nonmagnetic ionic liquid-based solutions: cosolvent and temperature effects
    Publication . Beira, Maria; Daniel, Carla; Almeida, Pedro L.; Corvo, Marta C.; Rosatella, Andreia; Afonso, Carlos A. M.; Sebastião, Pedro
    In this work, H-1 NMR relaxometry and diffusometry as well as viscometry experiments were carried out as a means to study the molecular dynamics of magnetic and nonmagnetic ionic liquid-based systems. In order to evaluate the effect of a cosolvent on the superparamagnetic properties observed for Aliquat-iron-based magnetic ionic liquids, mixtures comprising different concentrations, 1% and 10% (v/v), of DMSO-d6 were prepared and studied. The results for both magnetic and nonmagnetic systems were consistently analyzed an suggest that, when at low concentrations, DMSO-d6 promotes more structured ionic arrangements, thus enhancing these superparamagnetic properties. Furthermore, the analysis of temperature and water concentration effects allowed to conclude that neither one of these variables significantly affected the superparamagnetic properties of the studied magnetic ionic liquids.
    2017-12-28Journal article Restricted access Show more
  • Simulator for driving performance monitoring
    Publication . Raimundo, Diogo Alexandre Rodrigues; Lourenço, André Ribeiro; Abrantes, Arnaldo Joaquim Castro
    Driver and driving behaviour monitoring are a reality on new cars and on old fleets, driven by increased awareness about safety and environmental concerns. The numbers of car crashes are decreasing but still represent a huge concern, leading to the renewed interest on driving research topic. This thesis is centred on this theme and aims develop a driving simulator and modular software architecture that enables the variables related with the simulated vehicle, and that at the same time, acquires physiological, in particular the electrocardiogram (ECG), and behavioural variables from the driver. These data are registered aiming developing algorithms for drowsiness and fatigue, and also other related effects. The developed system is based on a message management and distribution module that uses the Publish/Subscribe pattern and the Open Sound Control communication protocol. All modules, including the simulator and the ECG module, communicate through this central module. The simulator is developed on the Unity platform and has some elements of artificial intelligence to control other cars present in the simulation. The results show that the proposed architecture is adequate for the proposed task, and can be used for drowsiness and fatigue studies. Preliminary results show that there are differences on driver variables (steering wheel movement) on drowsiness driving. More test are necessary to correlate with physiological variables.
    2017-12-28Master thesis Open access Show more