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Repositorio DSpace at LNEC: Recent submissions

Now showing items 1721-1740 of 8548

Hygrothermal ageing of pultruded GFRP profiles: Comparative study of unsaturated polyester and vinyl ester resin matrices

Sousa, J.; Garrido, M.; Correia, J. R.; Cabral-Fonseca, S. (Elsevier Ltd, 2020-11-06)

The durability of pultruded GFRP composites is critical to their performance in civil engineering applications, for which comprehensive and validated data is limited. To address this issue, this study presents an extensive ...
In-service performance of fiber-reinforced polymer construction used in water and sewage treatment plants

Castelo, A.; Correia, J. R.; Cabral-Fonseca, S.; Brito, J. (ASCE, 2020-05-07)

Fibre reinforced polymer (FRP) composites are being increasingly used in the construction sector, especially in corrosion-prone applications. However, there is still a lack of knowledge about their long-term behaviour under ...
Estudos complementares no âmbito dos processos de reabilitação ambiental relacionados com a utilização da Base das Lajes pelos EUA - Estudo da rede de abastecimento de água em zonas com solos potencialmente contaminados

Loureiro, D.; Mesquita, E.; Rosa, M. J.; Leitão, T. E.; Antunes, M. L. (2020-12)

O LNEC encontra-se a apoiar o Ministério da Defesa Nacional (MDN) num conjunto de questões técnico-ambientais relacionadas com a presença, nos últimos 60 anos, do contingente da Força Aérea Americana (USAFE) na Base das ...
Durability of adhesively bonded joints between pultruded GFRP adherends under hygrothermal and natural ageing

Sousa, J.; Correia, J. R.; J. GONILHA; Cabral-Fonseca, S.; J.P. FIRMO; Keller, T. (Elsevier Ltd, 2018-09-23)

This paper presents an experimental and numerical study about the durability of adhesively bonded joints between pultruded glass fibre reinforced polymer (GFRP) adherends for civil engineering applications. Single lap joint ...
Effects of thermal cycles on adhesively bonded joints between pultruded GFRP adherends

Sousa, J.; Correia, J. R.; Firmo, João P.; Cabral-Fonseca, S.; J. GONILHA (Elsevier Ltd, 2018-02-27)

This paper presents an experimental study about the effects of thermal cycles on adhesively bonded joints between pultruded glass fibre reinforced polyester (GFRP) adherends used in civil engineering structural applications. ...
Inspection, diagnosis and rehabilitation systems for all-fibre-reinforced polymer constructions

Castelo, A.; Correia, J. R.; Cabral-Fonseca, S.; Brito, J. (Elsevier Ltd, 2020-04-23)

In the past few decades, the construction industry has been increasingly using fibre reinforced polymer (FRP) materials, due to their advantages in comparison with traditional materials, especially in aggressive environments. ...
Some permanent effects of hygrothermal and outdoor ageing on a structural polyurethane adhesive used in civil engineering applications

Sousa, J.; Correia, J. R.; Cabral-Fonseca, S. (Elsevier Ltd, 2018-04-27)

This paper presents an experimental study about the effects of hygrothermal and outdoor ageing on a polyurethane (PUR) adhesive used in civil engineering applications. Small scale adhesive coupons were exposed to different ...
Durability of carbon fibre reinforced polymer laminates used to reinforced concrete structures

Cabral-Fonseca, S.; Nunes, J. P.; Rodrigues, M. P.; Eusébio, M. I. (Walter de Gruyter, 2011)

Due to their excellent mechanical properties and easy application Carbon Fibre Reinforced Polymers (CFRP) are being successfully used to repair and renewing old and damaged civil engineering infrastructures. In particular, ...
Métodos expeditos para avaliação sísmica de edifícios de alvenaria com pavimentos rígidos

Bernardo, V.; Campos Costa, A.; Costa, A.; Catarino, J. M.; Candeias, P. (LNEC, APEE, GPBE e SPES, 2020-11)

A avaliação da segurança sísmica de edifícios existentes de alvenaria tem como referência os procedimentos dispostos na NP EN 1998-3:2017 (Anexo C) e o respetivo Anexo Nacional, que estabelecem os requisitos de desempenho ...
Occurrence and seasonality of pharmaceutical compounds in urban wastewaters in two Portuguese regions

Silva, C.; Almeida, C.M.M.; Rodrigues, J.A.; Sofia, S.; Coelho, R.; Martins, A.; Lourinho, R,; Cardoso, E.; Cardoso, V.V.; Benoliel, M. J.; Rosa, M. J. (Taylor & Francis online, 2021-03)

The occurrence of a representative range of pharmaceutical compounds (PhCs) in urban wastewaters was studied in two Portuguese water-scarce regions (Lisbon great area, and Faro – Algarve), involving 55 sampling campaigns ...
An update on wastewater multi-resistant bacteria: Identification of clinical pathogens such as Escherichia coli O25b:H4-B2-ST131-producing CTX-M-15 ESBL and KPC-3 carbapenemase-producing Klebsiella oxytoca

Mesquita, E.; Ribeiro, R.; Silva, C.J.C.; Alves, R.; Baptista, R.; Condinho, S.; Rosa, M. J.; Perdigão, J.; Caneiras, C.; Duarte, A. (MDPI, 2021-03)

Wastewater treatment plants (WWTPs) are significant reservoirs of bacterial resistance. This work aims to identify the determinants of resistance produced by Gram-negative bacteria in the influent and effluent of two WWTPs ...
MOSAIC.pt – Levantamento fotogramétrico com drone da praia da Cova Gala em 2020

Henriques, M. J. (2021-03)

Este relatório apresenta os procedimentos do levantamento fotogramétrico, realizado com um drone, assim como as ações complementares, destinados a obter informação de carácter geométrico da praia da Cova Gala em 2020. Este ...
Instuções para o uso da aoarelhagem de observação de barragens

entidade LNEC (1963-05)
Implementação do modelo de auto-avaliação CAF no LNEC - Implementação do Plano de Melhorias (Avaliação Final)

Santos, M. A.; Couto, P.; Barateiro, J.; Graça Igreja, M.; Fernandes, O. (2021-01)

O relatório enquadra-se no Subprojeto A – Implementação do Modelo de Autoavaliação CAF (Common Assessment Framework) na Administração Pública, do Projeto GO-LNEC – Capacitação para a Melhoria da Qualidade na Gestão ...
Low Froude Number Stilling Basins—Hydrodynamic Characterization

Steinke Jr., R.; Dai Prá, M.; Lopardo, R. A.; Marques, M. G.; Melo, J.; Priebe, P. S.; Teixeira, E. D. (Asce Library, American Society of Civil Engineers, 2021-01)

Hydraulic jumps, frequently present in energy dissipation structures, have been thoroughly investigated over the past 70 years. However, studies have focused primarily on the more common and more stable cases of large ...
Optimizing wave overtopping energy converters by ANN modelling: evaluating the overtopping rate forecasting as the first step

OLIVER, J.M.; ESTEBAN, M.D.; LÓPEZ-GUTIÉRREZ, J.S.; Negro, V.; Neves, M. G. (MDPI, 2021-01)

Artificial neural networks (ANN) are extremely powerful analytical, parallel processing elements that can successfully approximate any complex non-linear process, and which form a key piece in Artificial Intelligence models. ...
Modelação Numérica da Rebentação das Ondas. Sistema Integrado de Modelação da Agitação Marítima

Zózimo, A. C. (2010-11)

Esta dissertação divide-se em duas partes principais, uma dedicada ao desenvolvimento e validação de um novo modelo numérico para a propagação de ondas fracamente não lineares com a inclusão da dissipação de energia por ...
Gestão de ativos na prestação de serviços de água e esgotamento sanitário

Alegre, H. (Revista Regulação em Foco, 2021-01-28)

A prestação dos serviços de água e esgotamento sanitário depende de infraestruturas constituídas por ativos de longa duração, com elevados custos de investimento, de construção e de reabilitação. Por essa razão, a gestão ...
The contribution of NBS to urban resilience in stormwater management and control: a framework with stakeholder validation

Beceiro, P.; Brito, R.; Galvão, A. (MDPI, 2020-03)

Urban waters represent a crucial component for the enhancement of urban resilience due to their importance in cities. Nature-based solutions (NBS) have emerged as sustainable solutions to contribute to urban resilience in ...
RAF resilience assessment framework - a tool to support cities' action planning.

Cardoso, M. A.; Brito, R.; Pereira, C.; Gonzalez, A.; Stevens, J. R.; Telhado, M. (MDPI, 2020-03)

Urban areas are dynamic, facing evolving hazards, having interacting strategic services and assets. Their management involves multiple stakeholders bringing additional complexity. Potential impacts of climate dynamics may ...

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