Algoritmo neurogenético com vistas para o planejamento de rotas de robôs móveis autônomos

Pós-graduação em Ciência da Computação - IBILCE

Climatic patterns and physical controls of chlorophyll-a in the Northeast Atlantic

Tese de Doutoramento, Física, 17 de Dezembro de 2013, Universidade dos Açores.

Modèles animaux pour l’évaluation préclinique des dispositifs médicaux en radiologie interventionnelle au CR21 AP-HP INRA

Dissertação de Mestrado, Engenharia Zootécnica, 14 de Maio de 2015, Universidade dos Açores.

Desenvolvimento de um pedómetro para telemóvel

Esta tese descreve o desenvolvimento do hardware e do software de um sistema com a capacidade de reconhecer o número de passos que uma pessoa efectua durante uma actividade física. O sistema consiste num acelerómetro controlado por um microcontrolador, que comunica com um dispositivo móvel através de Bluetooth. De modo a realizar o sistema foi necessário analisar uma vasta bibliografia, para conhecer o estado da arte desta tecnologia, entender o princípio de funcionamento do protocolo Bluetooth e os conceitos biomecânicos por detrás da marcha humana. A proposta deste trabalho apresentava como elemento diferenciador do estado da arte o uso de um acelerómetro em conjunto com sensores de pressão. Com a conjugação destes sensores pretendia-se aumentar a precisão de um equipamento que normalmente não é reconhecido por essa característica. Contudo, a indisponibilidade dos sensores de pressão levou a que o sistema só fosse constituído pelo acelerómetro. Embora, o sistema foi projectado considerando que os sensores de pressão serão incluídos num futuro desenvolvimento. Neste trabalho foram desenvolvidos dois algoritmos para detectar os passos que uma pessoa executa, com pé onde é colocado o sensor, quando caminha ou corre. Num dos testes realizados o algoritmo da “aceleração composta” detectou 84% dos passos, enquanto o algoritmo da “aceleração simples”detectou 99%. A plataforma para a interface gráfica pretendia-se que fosse um telemóvel, contudo não foi possível obter um telemóvel que suporta-se o perfil SPP (Serial Port Profile), necessário para a comunicação com o módulo Bluetooth usado. A solução passou por usar como plataforma um computador portátil com Bluetooth, para o qual foi desenvolvido a aplicação “Pedómetro ISEP” em Visual Basic. O “Pedómetro ISEP” apresenta várias funcionalidades, entre elas destaca-se o cálculo da distância percorrida, da velocidade, e das calorias consumidas, bem como, o registo desses valores em tabelas e da possibilidade de desenhar os gráficos representativos do progresso do utilizador.

Le lexique fourni et interiorisé: un moyen efficace pour construire un genre ?

Cet article présente les premiers résultats d’une recherche s’intéressant à l’articulation entre imitation et invention dans l’écriture chez les jeunes scripteurs. L’étude s’attache à observer les modes de récupération de ressources textuelles fournies par les conditions de production. L’expérimentation a été conçue pour observer l’appropriation d’un genre. Des dispositifs didactiques ont été proposés à plusieurs classes de fin d’école primaire française, à partir de textes littéraires issus de la robinsonnade mis à disposition soit simultanément à l’acte d’écriture soit lors d’une seconde écriture. L’étude montre comment les élèves ont recours à deux procédés contrastés : le réinvestissement du lexique et la reformulation. Les données recueillies mettent en évidence la reprise attendue de mots caractéristiques du genre, et révèlent l’ingéniosité des scripteurs pour restructurer des matériaux langagiers. Certaines stratégies témoignent des difficultés rencontrées par les élèves qui ont eu à interpréter le lexique littéraire puis à le transférer dans leur propre récit. Des modes de reformulation différents coexistent dont on peut offrir une première catégorisation en fonction d’une appropriation plus ou moins réussie du genre considéré.

Conversão de veículos diesel para tração elétrica

Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Mecânica

Instrumentação e monitorização de estruturas geotécnicas na Rede Ferroviária Nacional: estudo de caso do talude de aterro entre os Km's 236+450 e 236+720 da Linha do Sul

Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Civil na Área de Vias de Comunicação e Transportes

Stability of fractional order systems

The theory and applications of fractional calculus (FC) had a considerable progress during the last years. Dynamical systems and control are one of the most active areas, and several authors focused on the stability of fractional order systems. Nevertheless, due to the multitude of efforts in a short period of time, contributions are scattered along the literature, and it becomes difficult for researchers to have a complete and systematic picture of the present day knowledge. This paper is an attempt to overcome this situation by reviewing the state of the art and putting this topic in a systematic form. While the problem is formulated with rigour, from the mathematical point of view, the exposition intends to be easy to read by the applied researchers. Different types of systems are considered, namely, linear/nonlinear, positive, with delay, distributed, and continuous/discrete. Several possible routes of future progress that emerge are also tackled.

Caracterização de estruturas portuárias: caso de estudo: ampliação do Terminal XXI, Sines

Relatório de Estágio para obtenção do grau de Mestre em Engenharia Civil

Genetic diversity and epidemiology of antimicrobial resistant Streptococcus pneumoniae isolates

Dissertation presented to obtain a Ph.D. degree in Biology, speciality in Microbiology, by Universidade Nova de Lisboa, Faculdade de Ciências e Tecnologia

Towards a GIS-T database design and implementation for public transit planning: the case study of Dar-Es-salaam metropolitan city, Tanzania.

Dissertation submitted in partial fulfilment of the requirements for the Degree of Master of Science in Geospatial Technologies

Growth of (Perylene)(2) [PD(MNT)(2)] crystals

The conditions for [pd(mnt)(2)]he growth of [pd(mnt)(2)]Perylene) [pd(mnt)(2)] [Pd(mnt) [pd(mnt)(2)]] crystals either by chemical oxidation and electrochemical routes are [pd(mnt)(2)]escribed. The electrocrystallisation is limited by close [pd(mnt)(2)]roximity of [pd(mnt)(2)]he oxidation [pd(mnt)(2)]otentials of [pd(mnt)(2)]he [pd(mnt)(2)]erylene [pd(mnt)(2)]onor and [Pd(mnt) [pd(mnt)(2)]] - anion, and [pd(mnt)(2)]epending on [pd(mnt)(2)]he experimental conditions [pd(mnt)(2)]ifferent [pd(mnt)(2)]orphologies can be obtained. [pd(mnt)(2)]Per) [pd(mnt)(2)] [Pd(mnt) [pd(mnt)(2)]] crystals obtained by elecrocrystallisation were found [pd(mnt)(2)]o be [pd(mnt)(2)]ainly of [pd(mnt)(2)]he β-polymorph with [pd(mnt)(2)]roperties comparable [pd(mnt)(2)]o [pd(mnt)(2)]he Cu, Ni and Pt analogues [pd(mnt)(2)]reviously [pd(mnt)(2)]escribed at variance with [pd(mnt)(2)]hose obtained by chemical oxidation which are [pd(mnt)(2)]ainly of [pd(mnt)(2)]he α-polymorph.

Methyl syringate: An efficient phenolic mediator for bacterial and fungal laccases

The aim of the present work is to provide insight into the mechanism of laccase reactions using syringyl-type mediators. We studied the pH dependence and the kinetics of oxidation of syringyl-type phenolics using the low CotA and the high redox potential TvL laccases. Additionally, the efficiency of these compounds as redox mediators for the oxidation of non-phenolic lignin units was tested at different pH values and increasing mediator/non-phenolic ratios. Finally, the intermediates and products of reactions were identified by LC-MS and H-1 NMR. These approaches allow concluding on the (1) mechanism involved in the oxidation of phenolics by bacterial laccases, (2) importance of the chemical nature and properties of phenolic mediators, (3) apparent independence of the enzyme's properties on the yields of non-phenolics conversion, (4) competitive routes involved in the catalytic cycle of the laccase-mediator system with several new C-O coupling type structures being proposed.

On chaos, transient chaos and ghosts in single populations models with allee effects

Density-dependent effects, both positive or negative, can have an important impact on the population dynamics of species by modifying their population per-capita growth rates. An important type of such density-dependent factors is given by the so-called Allee effects, widely studied in theoretical and field population biology. In this study, we analyze two discrete single population models with overcompensating density-dependence and Allee effects due to predator saturation and mating limitation using symbolic dynamics theory. We focus on the scenarios of persistence and bistability, in which the species dynamics can be chaotic. For the chaotic regimes, we compute the topological entropy as well as the Lyapunov exponent under ecological key parameters and different initial conditions. We also provide co-dimension two bifurcation diagrams for both systems computing the periods of the orbits, also characterizing the period-ordering routes toward the boundary crisis responsible for species extinction via transient chaos. Our results show that the topological entropy increases as we approach to the parametric regions involving transient chaos, being maximum when the full shift R(L)(infinity) occurs, and the system enters into the essential extinction regime. Finally, we characterize analytically, using a complex variable approach, and numerically the inverse square-root scaling law arising in the vicinity of a saddle-node bifurcation responsible for the extinction scenario in the two studied models. The results are discussed in the context of species fragility under differential Allee effects. (C) 2011 Elsevier Ltd. All rights reserved.

Diagnóstico ambiental de duas empresas

Mestrado em Engenharia Química - Ramo Tecnologias de Protecção Ambiental