Papers
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Uma abordagem transdisciplinar do papel da água como pilar da natureza, da saúde e do bem-estar
Mais de 50% da população vive em cidades e enfrenta fatores de estresseque afetam a saúde, tais como elevados níveis de poluição e ruído, tendocomo consequências comuns problemas cardiovasculares e circulatórios,obesidade, estresse, entre outros. O acesso a zonas verdes e azuis
Year: 2023
Number Pages:
39-47pp..
Author(s): Barbosa, A. E.; Rebelo, M.
: Cadernos Técnicos Engenharia Sanitária e Ambiental
Editor: Associação Brasileira de Engenharia Sanitária e Ambiental
Volume:
Volume 2, número 2.
Keywords: soluções integradas; soluções de base natural; saúde e bem-estar; população;; cidades sustentáveis
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Uma habitação muito adequada para pessoas idosas
No presente artigo e baseando-nos, apenas, numa única e excelente fonte bibliográfica ligada à incontornável iniciativa, desenvolvida no Reino Unido e globalmente intitulada Housing our Ageing Population: Panel for Innovation (HAPPI), desenvolvemos um conjunto de reflexões sobre a natureza que devem ter soluções de habitar que, realmente, sejam muito adequadas a pessoas envelhecidas e frequentemente fragilizadas, tendo-se em conta, evidentemente, qua cada pessoa será um caso e que cada contexto será sempre específico, mas que há, realmente, aspetos que devem marcar a promoção habitacional se a quisermos mais amiga dos idosos; um objetivo que deve estar na agenda urgente da promoção habitacional tendo-se presente a realidade crítica associada à atual
Year: 2023
Number Pages:
13p..
Author(s): Baptista Coelho, A.
: Infohabitar
Editor: Associação Portuguesa para a Promoção da Qualidade Habitacional - GHabitar APPQH
Volume:
Ano XIX, n.º 860.
Keywords: Intergeracionalidade; Habitação para idosos; Habitação intergeracional; Habitação
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Water mixing in rectangular storage tanks: small-scale versus field tests
Mixing and renewal processes are crucial for maintaining adequate drinking water quality in storage tanks. This paper studies the influence of baffle structures and of fill-and-draw cycles on water mixing and renewal in rectangular cross-section tanks through laboratory tracer tests carried out in two small-scale tanks (with and without baffles) and compares with results from a full-scale test. This study shows that the use of baffles inhibits water mixing and keeps older water pockets in small recirculation zones, though baffles allow faster water renewal than in open tanks for lower flow rates. High water volume variation in fill-and-draw cycles (between 50% to 80%) promotes water renewal, independently of the tank configuration (i.e. cross-section and the existence of baffles). Despite the existing baffle structure in the full-scale rectangular tank with 20% water volume variation, the high flow rates allowed a rapid renewal of the stored water
Year: 2023
Number Pages:
17p..
Author(s): Pinheiro, A.; Monteiro, L.; Almeida, M. C.; Covas, D.
: Journal of Hydraulic Research
Editor: Taylor&Francis
Volume:
Vol 61, nº2.
Keywords: Water storage tank; Turnover; Residence time distribution; Mixing; renewal
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A comprehensive derivation and application of reference values for benchmarking the energy performance of activated sludge wastewater treatment
Wastewater treatment plants (WWTPs) are facing challenges concerning the service
Year: 2022
Number Pages:
26 pp..
Author(s): Silva, C.; Rosa, M. J.
: Water 2022
Editor: MDPI
Volume:
14.
Keywords: Wastewater treatment plants; Mechanical aerators; Energy performance; Air diffusers; Activated sludge treatment
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A decision-making approach to assess and prioritise intervention solutions in water distribution systems.
The present paper aims at proposing and demonstrating the application of a decision-making approach that allows the identification, assessment, comparison and prioritisation of different intervention solutions. Infrastructural, financial, performance and economic perspectives are taking into consideration in the study. The proposed approach is composed of three main modules: 1) Analysis planning and database construction; 2) Infrastructure, asset or component diagnosis and prioritisation; and 3) Study of intervention solutions for the assets or components priority for intervention. Three assessment levels
Year: 2022
Number Pages:
4p..
Author(s): Cabral , M.; Loureiro, D.; Covas, D.
Editor: WDSA / CCWI
Keywords: Water distribution systems; Prioritisation process; Intervention solutions; Decision-making approach
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A Discussion on Winter Indoor Hygrothermal Conditions and Hygroscopic Behaviour of Plasters in Southern Europe
In Southern European countries, due to the specific climate, economy and culture, a permanent heating practice during winter is not widely adopted. This may have a significant effect on the performance of indoor coating materials, typically tested considering hygrothermal conditions in the range of 33
Year: 2022
Author(s): Ranesi, A.; Posani, M.; Veiga, M. R.; Faria, P.
: Infrastructures
Editor: MDPI
Volume:
2022, 7.
Keywords: hygrometric regulation; southern Mediterranean countries; hygroscopic behaviour; moisture buffering; indoor climate; hygrothermal comfort
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A Discussion on Winter Indoor Hygrothermal Conditions and Hygroscopic Behaviour of Plasters in Southern Europe.
In Southern European countries, due to the specific climate, economy and culture, a permanent heating practice during winter is not widely adopted. This may have a significant effect on the performance of indoor coating materials, typically tested considering hygrothermal conditions in the range of 33
Year: 2022
Author(s): Veiga, M. R.; Faria, P.; Ranesi, A.; Posani, M.
: Infrastructures
Editor: MDPI
Volume:
V.7 / assunto 3.
Keywords: hygrothermal comfort; indoor climate; moisture buffering; hygroscopic behaviour; southern Mediterranean countries; hygrometric regulation
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A distress-based condition assessment approach of urban water assets using novel deterioration indices
This paper aims at proposing and demonstrating the application of a novel distress-based condition assessment approach to evaluate the physical condition of inspectable urban water assets based on the classification of anomalies in terms of severity, intensity and extension using three new deterioration indices. These indices are, firstly, calculated at the asset component level and, then, aggregated at the asset level and at the infrastructure level by weighing the component indices with the respective replacement cost or criticality. A condition grading classification associated with the deterioration indices is proposed. The novel distress-based condition assessment approach is applied to 22 drinking water storage tanks and 17 wastewater pumping stations located in Portugal, that have been specifically inspected for this purpose. Results of deterioration indices are compared with those obtained by the value-based condition assessment approach. Results demonstrate that the proposed approach allows a more reliable assessment of the assets
Year: 2022
Number Pages:
18 pp..
Author(s): Cabral , M.; Loureiro, D.; Flores-Colen, I.; Covas, D.
: Water Resources Management
Editor: Springer Link
Volume:
Volume 36, 2022.
Keywords: Urban water assets; Deterioration index; Visual inspection; Distress-based approach; Condition assessment
Info
A flexible particle model for rock fracture: Validation and assessment of the Influence of deformability on the macroscopic response
Circular/spherical rigid particle models that were initially applied to rock fracture studieswere not able to match the ratio of the compressive strength to tensile strength that occurs in rock.In addition, the predicted macroscopic friction angle was much lower than the known hard rockexperimental values. Several enhancements have been proposed to address these issues, namelythe use of a clumped particle logic or the adoption of polygonal/polyhedral grain structures, eitherrigid or flexible. In this work, a flexible 2D DEM based particle model (PM) that allows deformableparticles to interact in a simplified way is presented. The proposed flexible PM model keeps thecontact interaction simplicity and the reduced computational costs characteristic of circular rigidparticle models. The PM model is tested using biaxial tests and Brazilian tests. A discussion re-garding the influence of the grain deformability on the macroscopic elastic and strength response ispresented. It is shown that, when compared with a rigid model, the proposed flexible PM modelpredicts more reasonable indirect tensile strength to direct tensile strength ratio and requires asmaller value of contact fracture energy to give a good agreement with known experimental data.It is also shown that the proposed flexible PM model can predict a behaviour similar to that ob-tained using a flexible PM model through inner particle discretization that is more computationallydemanding.
Year: 2022
Number Pages:
27p.
Author(s): Azevedo, N.; Braga Farinha, M. L.; Oliveira, S.
: Geotechnics
Editor: MDPI
Volume:
2.
Keywords: grain deformability; discrete element; particle model; fracture; rock
Info
A Hybrid Particle/Finite Element Model with Surface Roughness for Stone Masonry Analysis
Circular and spherical particle models are a class of discrete elements (DEM) that have been in-creasingly applied to fracture studies of quasi-brittle materials, such as rock and concrete, due to their proven ability to simulate fracture processes through random particle assemblies repre-senting quasi-brittle materials at the grain scale. More recently, DEM models have been applied to old stone masonry fracture studies. In order to extend its applicability to structures of larger di-mensions, an enhanced hybrid particle model is here proposed that allows finite elements with a given surface roughness, provided by the discretization of the element boundary with particles, to interact with the particulate media in which they are embedded. The performance of the hybrid model is compared with that of a traditional all-particle model under uniaxial testing. It is shown that similar results are obtained, namely in the elastic phase, figures of rupture, pre-peak and post-peak behaviour, while the hybrid model allows a significant computational run time re-duction of 20% to 25% in the coarse particle assemblies. Finally, the proposed hybrid model is applied in the simulation of shear tests of stone masonry walls, dry and mortared joints, providing a reasonably good agreement with both experimental results and predictions. For the rubble masonry tests, the hybrid model allows a computation run time reduction of around 40%, when compared with an all-particle model.
Year: 2022
Number Pages:
20p.
Author(s): Azevedo, N.; Lemos, J. V.
: Applied mechanics
Editor: mdpi
Volume:
3.
Keywords: fracture; hybrid model; finite element; discrete element; stone masonry
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