Artigos de Revista
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FMEA of a tailings dam
The concepts, principles, assumptions and fundamental rules of Failure Modes and Effects Analysis (FMEA) are introduced. An application to Cerro do Lobo tailings dam is presented, with the description of the systemconsidered, the functionalities, the potential failure modes of each component, their corresponding root causes and the sequence of effects. Finally, the available measures in place for the detection and control of the sequence of effects are also identified. Although FMEA application in complex dam systems may constitute a time consuming process, its outcome can be extremely useful as illustrated in this article. It makes it possible to assess and manage the major risks of dams so that mitigation actions, taken at an early stage, can be optimised from an efficiency standpoint.
Ano: 2012
Número Páginas:
89-104pp.
Autor(es): Santos, R. N. C.; Caldeira, L.; Bilé Serra, J.
Revista: Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards
Editor: Taylor & Francis
Volume:
6(2).
Keywords: Tailings dam; Control measures; Detection measures; Qualitative risk analysis; FMEA
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Functional biodiversity and farming techniques: how to measure impacts?
Farming and environment are key issues on political and social agendas on aglobal scale. In the past two decades, agricultural systems went through a majorrevision having in mind ecological and landscape concepts on a conservation basis.Technical profiles (TP) are used as study tools to evaluate operational costs and toassess the deviation between theoretical production models and each farm system.TPs of sustainable crop systems such as integrated production and organic farmingare based on principles, tasks and technologies, such as crop protection, cover crops and ecological infrastructures preservation, that expectably induce differences in the functional biodiversity present in each system. The main target of the present work was to develop a methodology to measure the impact(s) of farming practices on pestimportance (occurrence and damages) and functional biodiversity. This study wascarried out during 2005 and 2006 and was supported by the national project AGRO545
Ano: 2012
Número Páginas:
8.
Autor(es): Costa, C.; Godinho, M.; Duarte, S.; Mateus, C.; Figueiredo, E.; Mexia, A.
Revista: Revista Acta Horticulturae (ISHS)
Volume:
volume 933.
Keywords: Ecological infrastructures; Organic farming; Ipm; Technical profiles
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Gestão do risco sísmico em tubagens enterradas - O caso dos sistemas de drenagem de águas residuais
As tubagens enterradas constituem componentes principais de sistemas que permitem assegurar o bem estar e o desenvolvimento da sociedade, nomeadamente no que respeita ao abastecimento de água, à drenagem de águas residuais, ao transporte de energia e à comunicação.Com a consolidação das malhas urbanas, tem-se assistido a uma crescente preocupação, não só com a construção, mas em especial com a fase de utilização desses sistemas, tanto nas atividades de exploração (operação e manutenção) como de fim de vida (reabilitação e substituição). Adicionalmente, existe um conjunto crescente de preocupações mais vasto do que as questões operacionais correntes, que inclui os efeitos de fenómenos naturais, como os sismos. As abordagens de gestão do risco permitem ter em conta estes fenómenos e lidar explicitamente com a incerteza que lhes está associada.No contexto da problemática da gestão do risco sísmico de tubagens enterradas, apresenta-se um levantamento de modelos para avaliação da respetiva vulnerabilidade. No âmbito deste artigo é proposta uma abordagem para incorporar a variabilidade probabilística na modelação da vulnerabilidade sísmica de tubagens enterradas. Os resultados obtidos com a metodologia proposta são comparados com a gama de variação da vulnerabilidade sísmica apresentada pela American Lifelines Alliance.
Ano: 2012
Número Páginas:
4-21pp.
Autor(es): Sousa, V.; Luísa Sousa, M.; Campos Costa, A.; Matos, J. S.; Almeida, N.
Revista: Revista Águas & Resíduos
Editor: APESB
Volume:
Série III, N.º 17.
Keywords: Vulnerabilidade sísmica; Tubagem enterrada; Sistema de drenagem; Risco Sísmico
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Habitação, Cidade e Território de Interesse Social (i): uma necessidade actual e alguns caminhos urgentes
N/A
Ano: 2012
Número Páginas:
6 p..
Autor(es): Baptista Coelho, A.
Revista: Revista Infohabitar
Editor: Grupo Habitar
Keywords: Recuperar a rua; Recuperar a paisagem; Ordenamento do território; Habitação de interesse social; Cidade amiga dos peões; Caminhos da cidade
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Habitação, Cidade e Território de Interesse Social (ii): Vinte aspectos importantes associados a uma necessária redensificação urbana
N/A
Ano: 2012
Número Páginas:
7 p..
Autor(es): Baptista Coelho, A.
Revista: Revista Infohabitar
Editor: Grupo Habitar
Keywords: Urbanismo; Regeneração urbana; Densificação urbana
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How does the adsorption of microcystins and anatoxin-a on nanofiltration membranes depend on their co-existence and on the water background matrix
This work intends to study the adsorption of the cyanotoxins microcystin-LR (MC-LR) and anatoxin-a(ATX-a) on a nanofiltration membrane (150 Da molar mass cut-off and an isoelectric point of 5
Ano: 2012
Número Páginas:
8p.
Autor(es): Teixeira, M. R.; Rosa, M. J.
Revista: Water Science & Technology: Water Supply
Editor: IWA
Volume:
Volume 66, Number 5.
Keywords: Nom; Nanofiltration; Microcystins; Anatoxin-a; Adsorption
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Hydration products of limemetakaolin pastes at ambient temperature with ageing
Mortars constituted of lime mixtures with pozzolanic additions have been extensively used in the past for the construction of historic and traditional buildings. This paper presents the results of blended pastes of lime and metakaolin (MK), namely compounds formed and their stability over time. This research is part of an extensive study aiming at the formulation of lime based mortars for restoration purposes. It has been shown for several years that MK has been applied in inorganic binders due to its capacity to react vigorously with calcium hydroxide (CH). In the presence of water originating a series of major hydrated phases, namely tetra calcium aluminate hydrate (C4AH13), calcium silicates hydrates (CSH) and calcium aluminium silicate hydrates (stratlingite C2ASH8). Several blended pastes of lime and MK, with different substitution rates of lime by MK (wt%) were prepared and cured at a temperature of 20 ?C and relative humidity RH > 95%. The phase composition of the formed hydrated phases was determined by X-ray diffraction (XRD) and simultaneous thermal analysis (TGDTA). The obtained results showed that lime/MK pastes compositions displayed different reaction kinetics during curing time, being the pozzolanic products content directly proportional to the substitution rate of lime by MK. Also, a relationship between the increase stratlingite content and the MK substitution rate of lime by MK was found.
Ano: 2012
Número Páginas:
36-41pp.
Autor(es): Gameiro, A.; Santos Silva, A.; Veiga, M. R.; Velosa, A.
Revista: Thermochimica Acta
Editor: Elsevier
Volume:
535.
Keywords: Pozzolanic reactions; Hydrated phase; Metakaolin; Lime; Xrd; Tgdta
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Hydrodynamics around an Artificial Surfing Reef at Leirosa, Portugal
As a new alternative countermeasure to protect the coastal zone and to increase the surfing possibilities in the Leirosa area ofPortugal, multifunctional artificial reefs were investigated numerically in this paper. The primary surfing parameters used in the design(i.e., breaker type, peel angle, wave height at breaking, and currents around the artificial reef) were analyzed. The reef functionalitywas also analyzed for coastal protection. Two reef geometries with different reef angles of 45 and 66° were tested, considering two designwave conditions (storm and common) and two tide levels (medium and low). Simulations show that both reef geometries are adequate forsurfing, although the reef angle of 66° is more suitable for standard surfers, and the 45° angle is more adequate for advanced/professionalsurfers. A morphodynamic study should be carried out to analyze the efficiency of the artificial surf reef for coastal protection. DOI: 10.1061/(ASCE)WW.1943-5460.0000128. © 2012 American Society of Civil Engineers.
Ano: 2012
Número Páginas:
226-235pp.
Autor(es): Mendonça, A. C.; Fortes, C. J. E. M.; Capitão, R.; Neves, M. G.; Antunes do Carmo, J.; Moura, T.
Revista: Journal of Waterway, Port, Coastal and Ocean Engineering, ASCE
Keywords: Numerical modeling; Reef parameters; Multifunctional artificial reefs; Coastal protection; Surfing
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Implicações Económicas da Gestão Metrológica da Instrumentação
N/A
Ano: 2012
Número Páginas:
13-19pp.
Autor(es): Ribeiro, A.; Sousa, J.; Sousa, C.
Revista: Revista SPMet "Medições e Ensaios
Editor: SPMet - Sociedade Portuguesa de Metrologia
Volume:
Vol. I.
Keywords: Gestão metrológica; Instrumentação; Eficiência; Confirmação metrológica
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Importance of wave age and resonance in storm surges: The case Xynthia, Bay of Biscay
This study aims to hindcast and analyze the storm surge associated with Xynthia, a mid-latitude depressionthat severely hit the French central part of the Bay of Biscay on the 27
Ano: 2012
Número Páginas:
13-30pp.
Autor(es): Bertin, X.; Bruneau, N.; Breilh, J. F.; Fortunato, A. B.; Karpytchev, M.
Revista: Ocean Modelling
Volume:
42/1.
Keywords: Friction velocity; Wave age; Resonance; Numerical model; Storm surge; Xynthia
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