Encontrados 128 documentos, a visualizar página 1 de 13
Development of Co-Axial fibres composed of CA (Mn 50,000) and PEGs (600 and 100...
Costa, Manuel F. M.; Carneiro, Joaquim A. O.; Hammes, Nathalia; Monteiro, José; Rocha Segundo, Iran Gomes da; Felgueiras, Helena PradoRapid urbanisation and industrialisation have intensified the Urban Heat Is-land (UHI) effect, significantly increasing energy demand for thermal comfort. Urban buildings consume considerable energy throughout the year, which can be reduced by incorporating Phase Change Materials (PCMs) into building materials. PCMs effectively regulate temperature by storing and releasing heat as latent heat during phase trans...
Evaluation of heavy metal content in plastic bags used as improvised food cooki...
Costa, Manuel F. M.; Geraldo, Dulce; Carneiro, Joaquim A. O.; Nhanga, Manença Cristiano; Nhapulo, Sérgio Leonardo; João, Afonso FilipeThe widespread use of plastic bags as improvised food cooking covers in Mozambican communities has raised public health concerns, increasing interest in studying these plastic bags, which contain heavy metals additives used to improve their physical and chemical properties. This study aims to evaluate the levels of heavy metals commonly used in plastic bags used as improvised food cooking covers, focused on Moz...
Application of nano-TiO2 and micro-ZnO on cementitious surfaces for self-cleani...
Pereira Lessa, Fabíula; Lima Jr, Orlando; Margalho, Élida; Pinheiro, Claver; Rocha Segundo, Iran Gomes da; Carneiro, Joaquim A. O.Building façades are constantly exposed to atmospheric pollution and various external agents that can degrade their aesthetic qualities and introduce degradation patterns that affect the durability and performance of the materials. Façades with self-cleaning properties are important in the modern construction industry and the conservation of historic buildings, as they reduce costs and allow the preservation of...
Anti-icing coatings for asphalt mixtures using sprayed hierarchical nano/micro-...
Rocha Segundo, Iran Gomes da; Moreira, Luís; Freitas, E. F.; Lima, Orlando; Kuzminov, Denis; Carneiro, Joaquim A. O.In cold regions, icy roads cause hazards that extend beyond accidents, impacting communities and escalating air pollution during congestions. To reduce the risk of road accidents caused by ice formation on the pavement surface, new coatings have been developed to create superhydrophobic asphalt mixtures to avoid this issue. This study investigated the effect of two successive spraying coatings applied over an a...
Mitigação das Ilhas de Calor Urbanas através da Incorporação de Fibras Coaxiais...
Araújo, Vitor M. M.; Hammes, Nathalia; Lima Jr., Orlando; Zahabizadeh, Behzad; Cunha, Vítor M. C. F.; Pereira, Eduardo; Camões, Aires[Excerto] Introdução: As Ilhas de Calor Urbanas (ICU) ocorrem devido à substituição de superfícies naturais por materiais, por exemplo, cimentícios e asfálticos, que apresentam elevado calor específico e tendem a reter calor por longos períodos. Uma estratégia promissora para mitigar este efeito pode ser a utilização de argamassas com microfibras contendo materiais de mudança de fase (PCMs). Esses materiais aju...
Infrared thermography of cement mortar with phase change fibres
Hammes, Nathalia; Araújo, Vitor M. M.; Lima Jr., Orlando; Zahabizadeh, Behzad; Cunha, Vítor M. C. F.; Pereira, Eduardo; Camões, Aires; Marinho, ElinaUrban Heat Islands (UHIs), aggravated by intense urbanisation and heat-retaining materials from buildings and roads, affect the thermal comfort of human beings. To mitigate this issue, this study aims to study the thermal performance of cement mortars with coaxial polymeric fibres produced by wet spinning and containing polyethylene glycol (PEG 600 and 1000) (CM_PCF) as phase change material. Samples were irrad...
Marcações horizontais termocrómicas: sensores a base de cor para alertar condut...
Lima Jr., Orlando; Rocha Segundo, Iran; Mazzoni, Laura Nascimento; Freitas, E. F.; Carneiro, Joaquim A. O.As condições climatéricas são fatores críticos em acidentes rodoviários. Em situações adversas de gelo ou neve sobre o pavimento, o atrito superficial é significativamente reduzido, diminuindo a segurança rodoviária. Com a finalidade de alertar os condutores sobre a possível presença dessas condições sobre pavimentos betuminosos, este estudo tem como principal objetivo desenvolver Marcações Rodoviárias (MR) uti...
Designing CNF-reinforced coaxial phase change fibres for thermal regulation in ...
Hammes, Nathalia; Pinheiro, Inês; Lima Jr., Orlando; Marinho, Elina; Silva, Mauela; Felgueiras, Helena; Costa, Manuel F. M.; Rocha Segundo, Iran[Excerto] Urban Heat Islands (UHIs), intensified by the high thermal retention capacity of conventional construction materials, contribute to elevated temperatures in urban areas, compromising indoor thermal comfort and directly impacting the health and well-being of the population. As a mitigation strategy, the incorporation of coaxial fibres with phase change materials (PCFs) stands out for their ability to p...
Designing coaxial polymeric fibres with phase change materials for thermal regu...
Hammes, Nathalia; Monteiro, José; Lima Jr., Orlando; Marinho, Elina; Silva, M. Manuela P.; Felgueiras, Helena; Costa, Manuel F. M.; Rocha Segundo, Iran[Abstract] Urban expansion and the widespread use of heat-absorbing materials have intensified the Urban Heat Island (UHI) effect. As a result, rising surface temperatures pose significant challenges to energy efficiency, human well-being, and environmental quality. Incorporation of phase change materials (PCMs) into civil engineering materials (CEM) has emerged as a promising passive strategy for thermal regul...
Desenvolvimento de fibras coaxiais compostas por materiais mudança de fase para...
Monteiro, José Diogo Xavier; Hammes, Nathalia; Rocha Segundo, Iran Gomes da; Felgueiras, Helena Prado; Martins da Silva, Mariana; Behzad Zahabizadeh[Excerto] O aumento do impacto das Ilhas de Calor Urbano exige soluções sustentáveis que melhorem o conforto térmico para a população. Este estudo procura mitigar esta problemática através do uso experimental de Fibras poliméricas coaxiais com materiais de Mudança de Fase incorporados (PCFs). Estas apresentam um Material Mudança de Fase (PCM), o Polietileno Glicol (PEG400, 600, 800 e 1000) no núcleo e Acetato d...