Embroidered textile connectors for wearable systems

This thesis presents a novel textile microwave interconnect that can be easily attached and removed from textile devices. Interconnects perform a vital role in carrying RF signals between an amplifier and an antenna or other devices. Conventional interconnects used for interconnecting non-flexible circuits perform this function with very low losses, however the same is not true for transmission lines made on fabrics using conductive threads or inks. This scenario of using interconnects on fabric systems is challenging. Due to the necessity of washing fabrics, permanent attachments on the fabric have disadvantages. Theconnectionpresentedinthisthesisisdonewithoutanymetalor rigid parts on the textile devices side. The connector is held in place by magnets which are shown to have no negative impact on the microwave connection. Two models are then explored, a microstrip connector and a grounded coplanar waveguide (CPW) connector. A detailed study of the models was done and it was found that both models have reasonable results up to2GHz. The interconnects are fully characterized by de-embedding the connection part. This can be used to predict the effect the interconnect will have when used to connect a microwave equipment. The microstrip version of the interconnect is attached to an antenna and the results presented. The interconnect has no negative effect on the reflection coefficient measurement of the antenna. Repeatability tests were also performed with this model, with no visible change in the connection quality between measurements. Different embroidery patterns and stitching designs were also investigated. These are used to reduce the amount of conductive thread used up to 59% reduction in thread ammount. A wearable antenna was fully converted from rigid copper sheet to a full textile design

Charging electric vehicles from photovoltaic generation with intermediate energy storage

Trabalho apresentado em 6th International Conference on Clean Electrical Power Renewable Energy Resources Impact (ICCEP17), 27-29 June 2017, Santa Margherita, Liguria, Italy.N/

Mining noise affects loud call structures and emission patterns of wild black-fronted titi monkeys

Anthropogenic noise pollution is increasing and can constrain acoustic communication in animals. Our aim was to investigate if the acoustic parameters of loud calls and their diurnal pattern in the black-fronted titi monkey (Callicebus nigrifrons) are affected by noise produced by mining activity in a fragment of Atlantic Forest in Brazil. We installed two passive acoustic monitoring devices to record sound 24 h/day, 7 days every 2 months, for a year; one unit was close to an opencast mine and the other 2.5 km away from it. Both sites presented similar habitat structures and were inhabited by groups of black-fronted titi monkeys. We quantified the noise at both sites by measuring the equivalent continuous sound level every 2 months for 1 year and quantified the emission of loud calls by titi monkeys through visual inspection of the recordings. The close site presented higher ambient noise levels than the far site. The quantitative comparison of loud calls of black-fronted titi monkeys between the two sites showed less calling activity in the site close to the mine than in the site further away. Approximately 20 % of the calls detected at the site close to the mine were masked by noise from truck traffic. Loud calls were longer at the site far from the mine and the diurnal patterns of vocal activity differed in the amount of calling as well as in the timing of peak calling activity between the two sites. Our results indicate that mining noise may constrain titi monkeys’ long-distance vocal communication. Loud calls occupy a similar frequency band to mining noise, and an increase in ambient noise may be triggering black-fronted titi monkeys to adjust their long-distance communication patterns to avoid masking of their calls. Given that vocalizations are an important means of social interaction in this species, there are concerns about the impact of mining noise on populations exposed to this human activity

Changes to TB care in an outpatient centre during the COVID‐19 pandemic

info:eu-repo/semantics/publishedVersio

Superconductivity and their applications

Trabalho apresentado em International Conference on Renewable Energies and Power Quality (ICREPQ’17), 4 a 6 de Abril de 2017, Málaga, EspanhaThe research in the field of superconductivity has led to the synthesis of superconducting materials with features that allow you to expand the applicability of this kind of materials. Among the superconducting materials characteristics, the critical temperature of the superconductor is framing the range and type of industrial applications that can benefit from them. Some examples of industrial applications incorporating superconducting materials stand out in this paper. Among other possibilities, the nuclear magnetic resonance, the magnetic levitation train, the transport processing of electrical energy (motors, generators, transformers and power lines) and superconducting magnetic energy storage (SMES) systems are already solutions contributing to the nowadays daily life, but more than that, are solutions that will contribute to improve the quality of life of many human beings in the near future. In addition to these solutions, in this paper are presented and discussed the pros and cons of a solution designed for the fast field cycling nuclear magnetic resonance technique that benefits of the usage of superconducting blocks.N/

FFC NMR relaxometer with improved magnetic field uniformity

Trabalho apresentado na 9th Conference on FFC NMR Relaxometry, July 2015, Aberdeen, UK.N/

Development of a System for the Usability of Forest Residuesfor Electric Energy Production

Trabalho apresentado em International Conference on Renewable Energies and Power Quality, 4-6 maio 2016, Madrid, SpainN/

Digital Control of a FFC NMR relaxometer

Trabalho apresentado em 9th Conference on FFC NMR Relaxometry, July 2015, Aberdeen, UK.N/

Optimising mRNA vaccines manufacturing by using Machine learning approaches

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Microwave interconnects between textile and rigid substrates using permanent magnets

This paper presents a new approach to the problem of the transition between a textile microwave system and a regular microwave system. A simulated model of a transition between copper conductive line and textile conductive line is presented, with a comparison between simulated and measured results of the same model showing reasonable to good agreement. The work aims to create a full textile remountable and flexible microwave connector