Polytechnic Institute of Lisbon

Lisbon, Portugal

The Polytechnical Institute of Lisbon is one of the biggest state-run polytechnic institutes in Portugal. It was founded in Lisbon during the 1980s, being composed by several higher education institutes and schools, some of them with a longer history. In total, 12,933 students were enrolled on all schools for the 2007-2008 school-year. Wikipedia.

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Agency: European Commission | Branch: H2020 | Program: MSCA-RISE | Phase: MSCA-RISE-2014 | Award Amount: 328.50K | Year: 2015

On July 4th CERN has announced the discovery of a scalar particle at the Large Hadron Collider (LHC), later identified as the Higgs boson. This scientific breakthrough was accomplished due to the joint efforts of thousands of scientists from all around the globe. This long awaited discovery increased our understanding of the world, providing an explanation for the mechanism from which all elementary particles acquire mass. However, there are still fundamental questions awaiting a clear answer: which model better describes nature when all observed properties of this new particle are taken into consideration? Will these new models help to solve other outstanding problems in elementary particle physics? The goal of this project is to look for answers to these crucial questions regarding our understanding of nature. In order to address the problem we have gathered a group of people with complementary expertises that range from model builders to high-energy tool developers who will finally make the connection to the LHCs experimental collaborations. We expect that this interaction between the different nodes of this international collaboration will result in a database together with high-energy tools where a number of models will be readily available for testing by the experimental groups at the LHC and future colliders. The staff exchange will be planned according to the needs of the project. There have been collaborations in the past between some of the nodes. We now expect that the proposed staff exchange will enhance this Higgs physics network, with an effective skills development both for experienced and early stage researchers. Finally we foresee that the project will not only have an impact on European science but will also contribute to bring together different cultures with a very positive outcome for society as a whole.

Martins L.M.D.R.S.,Polytechnic Institute of Lisbon | Martins L.M.D.R.S.,University of Lisbon | Pombeiro A.J.L.,University of Lisbon
Coordination Chemistry Reviews | Year: 2014

This work concerns recent advances (since 2005) in the oxidative functionalization of alkanes, alkenes and ketones, under mild conditions, catalyzed by homoscorpionate tris(pyrazol-1-yl)methane metal complexes. The main types of such homogeneous or supported catalysts are classified, and the critical analysis of the most efficient catalytic systems in the different reactions is presented. These reactions include the mild oxidation of alkanes (typically cyclohexane as a model substrate) with hydrogen peroxide (into alkyl hydroperoxides, alcohols, and ketones), the hydrocarboxylation of gaseous alkanes (with carbon monoxide and potassium peroxodisulfate) into the corresponding Cn+1 carboxylic acids, as well as the epoxidation of alkenes and the Baeyer-Villiger oxidation of linear and cyclic ketones with hydrogen peroxide into the corresponding esters and lactones. Effects of various reaction parameters are highlighted and the preferable requirements for a prospective homogeneous or supported C-scorpionate-M-based catalyst in oxidative transformations of those substrates are identified. © 2014 Elsevier B.V.

Branco G.C.,University of Lisbon | Ferreira P.M.,Polytechnic Institute of Lisbon | Ferreira P.M.,University of Lisbon | Lavoura L.,University of Lisbon | And 4 more authors.
Physics Reports | Year: 2012

We discuss theoretical and phenomenological aspects of two-Higgs-doublet extensions of the Standard Model. In general, these extensions have scalar mediated flavour changing neutral currents which are strongly constrained by experiment. Various strategies are discussed to control these flavour changing scalar currents and their phenomenological consequences are analysed. In particular, scenarios with natural flavour conservation are investigated, including the so-called type I and type II models as well as lepton-specific and inert models. Type III models are then discussed, where scalar flavour changing neutral currents are present at tree level, but are suppressed by either a specific ansatz for the Yukawa couplings or by the introduction of family symmetries leading to a natural suppression mechanism. We also consider the phenomenology of charged scalars in these models. Next we turn to the role of symmetries in the scalar sector. We discuss the six symmetry-constrained scalar potentials and their extension into the fermion sector. The vacuum structure of the scalar potential is analysed, including a study of the vacuum stability conditions on the potential and the renormalization-group improvement of these conditions is also presented. The stability of the tree level minimum of the scalar potential in connection with electric charge conservation and its behaviour under CP is analysed. The question of CP violation is addressed in detail, including the cases of explicit CP violation and spontaneous CP violation. We present a detailed study of weak basis invariants which are odd under CP. These invariants allow for the possibility of studying the CP properties of any two-Higgs-doublet model in an arbitrary Higgs basis. A careful study of spontaneous CP violation is presented, including an analysis of the conditions which have to be satisfied in order for a vacuum to violate CP. We present minimal models of CP violation where the vacuum phase is sufficient to generate a complex CKM matrix, which is at present a requirement for any realistic model of spontaneous CP violation. © 2012 Elsevier B.V.

Branco G.C.,CERN | Branco G.C.,University of Lisbon | Gonzalez Felipe R.,University of Lisbon | Gonzalez Felipe R.,Polytechnic Institute of Lisbon | Joaquim F.R.,University of Lisbon
Reviews of Modern Physics | Year: 2012

Several topics on CP violation in the lepton sector are reviewed. A few theoretical aspects concerning neutrino masses, leptonic mixing, and CP violation will be covered, with special emphasis on seesaw models. A discussion is provided on observable effects which are manifest in the presence of CP violation, particularly, in neutrino oscillations and neutrinoless double beta decay processes, and their possible implications in collider experiments such as the LHC. The role that leptonic CP violation may have played in the generation of the baryon asymmetry of the Universe through the mechanism of leptogenesis is also discussed. © 2012 American Physical Society.

Sher B.R.,Polytechnic Institute of Lisbon | Moreira R.A.S.,University of Aveiro
Composite Structures | Year: 2013

One of the most effective ways of controlling vibrations in plate or beam structures is by means of constrained viscoelastic damping treatments. Contrary to the unconstrained configuration, the design of constrained and integrated layer damping treatments is multifaceted because the thickness of the viscoelastic layer acts distinctly on the two main counterparts of the strain energy - the volume of viscoelastic material and the shear strain field. In this work, a parametric study is performed exploring the effect that the design parameters, namely the thickness/length ratio, constraining layer thickness, material modulus, natural mode and boundary conditions have on these two counterparts and subsequently, on the treatment efficiency. This paper presents five parametric studies, namely, the thickness/length ratio, the constraining layer thickness, material properties, natural mode and boundary conditions. The results obtained evidence an interesting effect when dealing with very thin viscoelastic layers that contradicts the standard treatment efficiency vs. layer thickness relation; hence, the potential optimisation of constrained and integrated viscoelastic treatments through the use of properly designed thin multilayer configurations is justified. This work presents a dimensionless analysis and provides useful general guidelines for the efficient design of constrained and integrated damping treatments based on single or multi-layer configurations. © 2012 Elsevier Ltd.

Tomas R.A.F.,ARTLANT | Bordado J.C.M.,University of Lisbon | Gomes J.F.P.,University of Lisbon | Gomes J.F.P.,Polytechnic Institute of Lisbon
Chemical Reviews | Year: 2013

The article reviews the chemistry fundamentals and kinetics behind the process of catalytic oxidation of p-xylene, providing insight into the most important aspects relevant for industrial terephthalic acid production operation and optimization and also on the most recent research aiming at alternatives to the existing dominant aerobic catalytic oxidation with the cobalt-manganese- bromine catalyst in acetic acid medium. Currently, direct liquidphase catalytic oxidation processes, consisting of homogeneous liquid-phase oxidation of p-xylene in a solvent with air in the presence of a transition-metal catalyst, is the dominant industrial process for terephthalic acid manufacture. There are variations of this process depending on the operating conditions and catalysts used, but from these, the Mid-Century process, also known as the AMOCO process, is the most widespread used technology.

University of Lisbon and Polytechnic Institute of Lisbon | Date: 2013-07-26

The present invention refers to an electrodeposition process of nickel-cobalt coatings (2), from aqueous solutions containing nickel and cobalt salts, by applying a pulsed waveform in the cathodic current range. It also refers to nickel-cobalt coatings (2), obtained by this process in a substrate (1), having a dendritic structure (4) supported by a base-layer (3) at the interface with the substrate, and being thus mechanically stable. Such nickel- cobalt coatings (2) have application in energy storage and conversion areas.

University of Lisbon and Polytechnic Institute of Lisbon | Date: 2013-01-14

Signal measurement for biometric recognition purpose includes a computational unit and a sensory unit designed to measure electrocardiographic (ECG) signals in a continuous fashion, guaranteeing that the biometric recognition is performed in an uninterrupted way whenever the device is used, with the purpose of enabling the automated recognition or validation of the identity of its wearer. The sensory unit has an electronic module through which the ECG is acquired. Its operating principle can be based in the electrical conductivity, in which case it requires contact with the skin of the user, or in any kind of capacitive or mechanical element, in which case it does not require any direct contact with the user. The device can be used in alternative or as a complement to existing systems that only perform a momentary identity check. It can be applied to vehicles, tablet computers or analogous contexts.

Agency: European Commission | Branch: FP7 | Program: MC-ERG | Phase: FP7-PEOPLE-2009-RG | Award Amount: 45.00K | Year: 2011

This collaborative project is in the area of Elementary Particle Physics Phenomenology, with focus on some extensions of the Standard Model (SM) of Particle Physics and top quark physics. It brings together theoretical and experimental particle physicists. The proposed collaboration is a research programme where the applicants expertise on the theoretical aspects of nonstandard Higgs production and the search of new physics in top quark production and decay in proton-proton collisions is matched with the expertise at the host institution as a part of the European network the applicant is building. We are especially interested in the search for the Higgs boson, the last particle (or particles) of the SM, that still remains to be experimentally discovered. The Higgs boson is potentially the key to answer the fundamental mystery of why elementary particles have mass. Its search is therefore the primary goal for CERNs Large Hadron Collider. New physics can also be hidden in the top quark, the heaviest of all known fermions. Our main goal is to contribute to a better understanding of the world of particle physics, by proposing theoretical models in the above area and developing and optimizing tools and data analysis techniques to experimentally detect their signatures. The expertise and skills of the the parties in this proposed collaboration (where not only the host institution takes part but also other institutions in Portugal and in the UK) match and complement each other extremely well. Exploring this synergy will produce a very fruitful collaboration, mutually advantageous to both parties. This application is ideally timed, as the data taking phase of ATLAS and the LHC has started at a centre-of-mass energy of 7 TeV and it will resume operation in 2013 with the planned 14 TeV stage.

Evangelista L.,Polytechnic Institute of Lisbon | de Brito J.,University of Lisbon
Cement and Concrete Composites | Year: 2010

Fine recycled aggregates are seen as the last choice in recycling for concrete production. Many references quote their detrimental influence on the most important characteristics of concrete: compressive and tensile strength; modulus of elasticity; water absorption; shrinkage; carbonation and chloride penetration. These two last characteristics are fundamental in terms of the long-term durability of reinforced or prestressed concrete. In the experimental research carried out at IST, part of which has already been published, different concrete mixes (with increasing rates of substitution of fine natural aggregates - sand - with fine recycled aggregates from crushed concrete) were prepared and tested. The results were then compared with those for a reference concrete with exactly the same composition and grading curve, but with no recycled aggregates. This paper presents the main results of this research for water absorption by immersion and capillarity, chloride penetration (by means of the chloride migration coefficient), and carbonation resistance, drawing some conclusions on the feasibility of using this type of aggregate in structural concrete, while taking into account any ensuing obvious positive environmental impact. © 2009 Elsevier Ltd. All rights reserved.

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