Papers by Filipe Bastos de Oliveira
Revista Em Extensão
Este é um relato de experiência desenvolvido com base no Projeto de Conscientização sobre a posse... more Este é um relato de experiência desenvolvido com base no Projeto de Conscientização sobre a posse responsável de animais em bairros do município de Uberlândia-MG. O projeto foi executado com o apoio da Pró-Reitoria de Extensão da Universidade Federal de Uberlândia, no semestre correspondente a setembro de 2009 e fevereiro de 2010, com reedição no período de maio a novembro de 2010. Neste sentido, visitaram-se bairros periféricos de Uberlândia, onde, de acordo com o Centro de Controle de Zoonoses, há um alto índice de posse irresponsável, bem como um alto número de animais abandonados e zoonoses. O projeto teve como objetivo conscientizar aos habitantes desses bairros em relação à posse responsável de animais domésticos. Além de visitas domiciliares, foram realizadas visitas e palestras em escolas localizadas nos bairros selecionados, interagindo com crianças de diversas idades, ao mesmo tempo em que se levava até as mesmas informações consideradas relevantes em relação à temática. N...
Given the current economic crisis that the automobile sector is subject in Portugal, it becomes i... more Given the current economic crisis that the automobile sector is subject in Portugal, it becomes important to companies in this sector to increase competitiveness, improve efficiency in managing and eliminating any type of existing waste. For this, it is necessary to understand some concepts regarding to the stocks management or Lean methodologies, contributing to a sustainable development of the enterprises. Given the importance of these issues that companies are subjected, this dissertation aims to conduct the study of the implementation of a management system for an efficient production in Schnellecke Portugal, Lda Unipessoal, a company which produces components for cars. So for the finished and intermediate products of the most important customer (Ford), was given the sizing of the production batch most economical. Then proceeded to study the kanban system implementation to reduce waste, to improve the production visual management to all employees and to design an efficient production system. In this study, some of the decisions taken are not those that promote higher efficiency in the production system but were influenced by the constraints and company policies. Even so, it was possible to design a production system based on the principles that underlie a kanban system which is the most efficient. Therefore, this study aims to check which plannings suits better the reality of the company. For this purpose, will be performed the evaluation and selection of production planning that is more efficient in terms of production optimization and resource management and visual production, taking into account all the constraints involved in all processes.
Tdx, Mar 26, 2010
Finishing this doctoral thesis brings me a mix of satisfaction and nostalgia difficult to describ... more Finishing this doctoral thesis brings me a mix of satisfaction and nostalgia difficult to describe. Looking back in time, I quickly realize that these three and half years of research were a memorable stage in my life. Thereby, I want to express my gratitude to those who have contributed the most for my academic, professional and personal growth. For convenience, I will express my thanks in Spanish, English and Portuguese. En primero lugar quiero agradecer a mis tutores Antonio Aguado y Climent Molins. Ellos me dieron la oportunidad de hacer el doctorado y siempre me apoyaron al máximo dentro de todas sus posibilidades. Fue un gran privilegio trabajar, convivir y aprender con los dos. Les agradezco profundamente su dedicación, contribuciones y enseñanzas a todos los niveles.
Journal of the American Chemical Society Jacs, 2005
Http Www Theses Fr, 2001
Les ondes d'alfven sont un phenomene de propagation observe lorsque l'on soumet un plasma... more Les ondes d'alfven sont un phenomene de propagation observe lorsque l'on soumet un plasma magnetise a un fort champ magnetique exterieur bo. Ces phenomenes sont decrits par les equations generales de la magnetohydrodynamique (mhd). Ces equations etant tres complexes d'un point de vue mathematique, un interet croissant a ete porte ces dernieres annees a ses limites asymptotiques. En tenant compte de l'effet hall dans la loi d'ohm generalisee, le systeme (mhd) devient dispersif, et il est possible de distinguer, dans le cas de la propagation d'ondes d'alfven, plusieurs modeles asymptotiques distincts. Dans cette these, nous avons etudie d'un point de vue mathematique un certain nombre de ces modeles asymptotiques. Tout d'abord, nous avons etudie le modele multidimensionnel de l'equation dnls, propose par myollus et wyller. Apres avoir considere le probleme lineaire associe, en obtenant des estimations du type strichartz, nous avons traite le probleme de cauchy relatif au systeme general, dans le contexte des espaces de sobolev analytiques de hayashi. Puis, nous avons traite le cas de l'equation dnls avec terme non-local, representant la resonance des particules. Ensuite nous avons effectue l'etude complete de l'equation de zakharov-rubenchick 1d, en montrant en particulier l'existence de solutions du type ondes-solitaires qui sont orbitalement stables. Finalement, nous avons pu demontrer rigoureusement que la dynamique definie par l'equation de schrodinger cubique se retrouve en partie dans celle relative a l'equation dnls.
for all the help they provided during the experimental procedures in the Laboratory of Self-Organ... more for all the help they provided during the experimental procedures in the Laboratory of Self-Organized Nanostructures. I want to specially acknowledge Mariana Proença, my co-supervisor, for all the laboratory teaching she provided and all the technical help in solution preparation and data analysis, which were of great importance to this work. Also I want to thank her for all the time spent in this project. Furthermore, I want to thank João Ventura for all the inspiration, motivation and support whenever the work reached a dead end. The first time I heard of this technology was through him and so I want to thank him for this great project opportunity and all the open possibilities that it can lead us to. I want to thank Maria Paz for teaching me how to operate the x-ray diffraction equipment and how to analyze the results. Also want to thank Francisco Carpinteiro for the dedication and time spent in this project and for the developed measurement setup. Due to his dedication, understanding and great work, I want to thank Rui Rocha, the scanning electron microscope operator, where his work was of major importance to understand all the produced samples and the paths to follow to complete this project. Finally, I want to leave a special thank to my colleagues, Bernardo Bordalo, Miguel Rosmaninho and Sérgio Naphulo for the company, feedback and discussion on each others work, which helped me to improve my work and try different and better paths. v Contents Declaration of Authorship i Resumo iii Abstract iv Acknowledgements v List of Figures ix List of Tables xi Scientific Work xii Entrepreneurship Relations xiii Abbreviations xiv Physical Constants xv Symbols xvi Contents viii 6 Conclusions and Future Work 56 Bibliography 58 FIGURE 1.1: Schematic representation of energy harvesting through different properties. Energy harvesting is defined as the ability to collect electrical energy from the surrounding environment, i.e. the capacity to convert unattended and unexplored sources FIGURE 1.2: Different working principles of nanogenerators: (a) thermoelectric [2], (b) triboelectric [15] and (c) piezoelectric [14] nanogenerators.
Coordination Chemistry Reviews, 2008
Introduced approximately two decades ago, macrocyclic deprotonated tetraamido (4N) and, nearly a ... more Introduced approximately two decades ago, macrocyclic deprotonated tetraamido (4N) and, nearly a decade earlier, acyclic diamidodialkoxido or diamidophenolato (2N/2O) ligand systems have been used, among other things, for the synthesis of a wide variety of high-valent ...
2010 9th IEEE/IAS International Conference on Industry Applications - INDUSCON 2010, 2010
Os sistemas de acionamento a velocidade variável são hoje uma realidade nos acionamentos industri... more Os sistemas de acionamento a velocidade variável são hoje uma realidade nos acionamentos industriais. A ocorrência de falhas nestes sistemas pode comprometer severamente a produção das plantas. O aumento da confiabilidade destes sistemas é, portanto, muito desejável. Com esta preocupação em mente, sistemas de aterramento e proteção foram desenvolvidos com o passar do tempo. Em particular, a situação de um inversor PWM (Pulse Width Modulated) em um sistema não-aterrado merece uma análise mais cuidadosa. Se este inversor estiver acionando um sistema com falhas de isolamento para terra (e.g. um motor elétrico de indução), em um primeiro momento o acionamento não será interrompido pelas proteções existentes, o que é bom para a continuidade da operação. Porém, sobretensões fase-terra surgirão, podendo levar à falha dos isolamentos do inversor, avaria do equipamento e indesejada parada não-programada da produção. Esta dissertação se propõe a entender qualitativamente os fenômenos envolvidos que podem causar a falha do sistema, a perda do inversor e a consequente parada ou restrição da produção. A partir deste entendimento, projetar e construir um circuito capaz de garantir a continuidade da operação enquanto não se eliminam as falhas no motor, sem o risco de perda do inversor.
Materials Science Forum, 2012
Mud acid attack of 14 lbm/gal Portland cement composites with 15 % of nonionic aqueous polyuretha... more Mud acid attack of 14 lbm/gal Portland cement composites with 15 % of nonionic aqueous polyurethane was investigated. Plain Portland hardened cement slurries showed the loss of weight around 23 %. The addition of aqueous polyurethane resulted in longer durability, with reduction around 87 % on the loss of weight without influence on the compressive strength or fratographic. The mechanism is related with the decreased porosity and permeability due to the polymeric net formation on the bulk and minor quantities of Ca+2, preferentially leached to the acidic solution. In this way, Portland-aqueous polyurethane composites are possible solutions to oil well cementing submitted to steam injection and mud acid acidizing operations.
2013 IEEE Energy Conversion Congress and Exposition, 2013
Hysteresis current controllers inherently present wide bandwidth and have been proposed for appli... more Hysteresis current controllers inherently present wide bandwidth and have been proposed for application in Vienna rectifiers switching at high frequencies. In such applications, near zero ac input currents are required at no load. Since the hysteresis band is limited by switching losses and delays, controlling low current amplitudes becomes an issue. In this paper, it is described as a suitable alternative to overcome such limitation, satisfying both the control of the power flow at no load and minimum current amplitude requirements. Test results on a 40-A/380-V Vienna rectifier are presented to support the theoretical analysis.
Science, 2007
Iron(V)-oxo species have been proposed as key reactive intermediates in the catalysis of oxygen-a... more Iron(V)-oxo species have been proposed as key reactive intermediates in the catalysis of oxygen-activating enzymes and synthetic catalysts. Here, we report the synthesis of [Fe(TAML)(O)] – in nearly quantitative yield, where TAML is a macrocyclic tetraamide ligand. Mass spectrometry, Mössbauer, electron paramagnetic resonance, and x-ray absorption spectroscopies, as well as reactivity studies and density functional theory calculations show that this long-lived (hours at –60°C) intermediate is a spin S = 1/2 iron(V)-oxo complex. Iron-TAML systems have proven to be efficient catalysts in the decomposition of numerous pollutants by hydrogen peroxide, and the species we characterized is a likely reactive intermediate in these reactions.
Journal of the American Chemical Society, 2005
The reaction between an Fe III complex and O2 to afford a stable catalytically active diiron(IV)µ... more The reaction between an Fe III complex and O2 to afford a stable catalytically active diiron(IV)µ-oxo compound is described. Phosphonium salts of orange five-coordinated Fe III-TAML complexes with an axial aqua ligand ([PPh4]1-H2O, tetraamidato macrocyclic Fe III species derived from 3
Journal of the American Chemical Society, 2004
[2Fe-2S] clusters found in the xanthine oxidase family of proteins exhibit an S = 1/2 EPR feature... more [2Fe-2S] clusters found in the xanthine oxidase family of proteins exhibit an S = 1/2 EPR feature, called signal II, for which one g-value is significantly above g = 2.0. The g-values of signal II cannot be explained with the standard spin coupling model that has been so successful in describing the g = 1.94 signals of [2Fe-2S] ferredoxins. We have studied the EPR spectra of the Rieske protein from Thermus thermophilus at pH 14 and observed a signal II-type EPR spectrum, with g-values at 1.81, 1.94, and 2.14. It is shown that the g-values of signal II can be explained by including an antisymmetric exchange term, d.S1xS2, in the spin Hamiltonian. The presence of this term is sensed by EPR if the isotropic exchange coupling constant J is sufficiently small. For the Rieske protein we determined J = 43 cm-1 which is at least 4 times smaller than the J values reported for [2Fe-2S] clusters that yield standard g = 1.94 signals.
Journal of Inorganic Biochemistry, 2006
Iron complexes of tetraamido macrocyclic ligands (TAML) are unique synthetic oxidation catalysts.... more Iron complexes of tetraamido macrocyclic ligands (TAML) are unique synthetic oxidation catalysts. In general, the central Fe III ion (S = 3/2) is surrounded by four, almost planar, deprotonated amide-N r-donors although the full suite with new generation systems includes some substitution of amides with related donor functionalities. Oxidation under different conditions affords a variety of high-valent forms of iron-TAMLs. This review provides a summary and discussion of structural and spectroscopic features of complexes oxidized by one equivalent above the ferric state. These comprise Fe IV-TAML high spin (S = 2) and intermediate spin (S = 1) systems, wherein the oxidation equivalent can be taken from the metal (Fe IV) or the ligand (TAML radical-cation Fe III), and coupled spin (S = 0) systems of l-oxoiron(IV) dimers. The discussion is principally based on data obtained by X-ray crystallography, Mö ssbauer spectroscopy, and density functional theory calculations.
Inorganica Chimica Acta, 2008
Inorganic Chemistry, 2008
Uploads
Papers by Filipe Bastos de Oliveira