A carregar...
19 resultados
Resultados da pesquisa
A mostrar 1 - 10 de 19
- Precipitation indices trends and correlations at a raingauge station in PortugalPublication . Guerreiro, Maria João; Lajinha, Teresa; Abreu, IsabelThe objective of this study is to provide insight on precipitation indices trends, based on daily precipitation records, and the SPI (Standardized Precipitation Index), based on monthly precipitation records, evaluate correlations and establish relationships between them in the 1911-1999 period. A negative trend was observed in the month of March for several indices, as well as a tendency for the dry semester to start sooner. O objectivo deste estudo é avaliar tendências temporais em índices de precipitação mensais, calculados com base na precipitação diária, e no índice de precipitação SPI (Standardized Precipitation Index), calculado com base na precipitação mensal, na estação udométrica do Chouto, avaliar correlações e estabelecer relações entre os vários índices, no período de 1911-1999. Observa-se uma tendência de decréscimo para o mês de Março em diversos índices e uma tendência para uma antecipação no início do semestre seco.
- Flood analysis with the standardized precipitation index (SPI)Publication . Guerreiro, Maria João; Lajinha, Teresa; Abreu, IsabelThe occurrence of flood spells is difficult to monitor and detect. However, there are some indices that permit to monitor hydrological and climatological conditions in river basins. The SPI (Standardized Precipitation Index) is one of those indices. Though the SPI was originally developed for drought detection and monitoring, it can also be applied to perceive wetter than normal conditions. This study pretends to characterize the relationship between the SPI and annual peak flow occurrences in the Tejo (Portugal) river basin and provide a tool for prediction of high flood risk. Results indicate that SPI satisfactorily explained the development of circumstances leading up to major peak flow events.
- Eco-physiological characterization of the macroinverterbate communities of a very disturbed urban stream (Rio Tinto, Portugal): How they survive?Publication . Jesus, Teresa Maria Gonçalves Moreira de; Monteiro, Álvaro; Guerreiro, Maria João; Abreu, Isabel; Amado, Ana; Costa, Miguel
- Is the economic dimension inducing the other sustainability dimensions, or is it the reverse? Perceptions from the Portuguese metal industryPublication . Armindo, J.; Fonseca, A.; Abreu, I.; Toldy, T.In organizational sustainability, the economic dimension is recognized as having a very important role. However, the discussion regarding whether it is exclusively the economic dimension that has the power to induce the other sustainability dimensions is far from agreement. The purpose of the present paper is to analyze the perceptions regarding the existence of mutual influences between the economic dimension of sustainability and the other sustainability dimensions – environmental, social and cultural – in a relevant Portuguese economic sector: the metal industry. The analysis and statistical tests performed with the 211 collected answers led to the conclusion that the influence exerted by the economic dimension on the other sustainability dimensions is perceived as dominant, both in present and future perspectives. The results also show the perception that the economic dimension is equally influenced by the environmental and social dimensions, and in a less extent, by the cultural dimension, and that all these mutual influences are perceived to increase in the future. The existence of organizational management systems has a positive effect on the perceptions regarding the existence of mutual influences between sustainability dimensions, but only for those companies with more than one certified management system. These results confirm that organizational management systems are connected to higher degrees of awareness regarding sustainability issues. Given that the great majority of the sampled industries are SMEs, the results obtained in this research demonstrate that the existence of mutual influences between sustainability dimensions is recognized even in smallsized industries.
- Avaliação de alguns parâmetros relativos ao estado ecológico do Rio Tinto e de alguns dos seus afluentes: monitorização (out’15-set’17) relatório finalPublication . Jesus, Teresa Maria Gonçalves Moreira de; Monteiro, Álvaro; Guerreiro, Maria João; Abreu, Isabel; Amado, Ana; Costa, MiguelO presente relatório foi realizado no âmbito do Projeto de Avaliação de Alguns Parâmetros Relativos ao Estado Ecológico do Rio Tinto e de alguns dos seus afluentes (no período compreendido entre outubro de 2015 e setembro de 2017) e tem como principal objetivo analisar o respetivo estado ecológico. Nesse período foram efetuadas deslocações mensais ao rio Tinto e a três dos seus afluentes para análise in loco de alguns parâmetros hidro-morfológicos e físico-químicos, bem como em posteriores análises laboratoriais em amostras, de água e de substrato do leito do rio, recolhidas em cada ponto de amostragem. A análise laboratorial compreendeu a determinação de parâmetros físico-químicos, na água e em sedimentos, e análise de amostras da comunidade de macroinvertebrados bentónicos. Realizou-se uma análise da variação espacial e temporal dos parâmetros analisados e calcularam-se índices de qualidade hidro-morfológica, de qualidade ripícola e de qualidade biológica da água. Os dados obtidos confirmam que o rio Tinto se encontra degradado, continuando a sofrer pressões provocadas pela ocupação das margens por áreas urbanas, industriais e agrícolas, com problemas ao nível das redes de saneamento e de águas pluviais, por afluentes com níveis de poluição elevada, pela deterioração das suas margens e pelas estruturas de regularização presentes ao longo do seu percurso. Quanto aos afluentes monitorizados, constatou-se que a ribeira da Granja foi um dos principais focos de poluição d rio Tinto, dadas as periódicas descargas de esgotos domésticos que, sobre este curso de água, foram efetuadas. Por outro lado, a ribeira da travessa do Caneiro foi um afluente com menor grau de contaminação.
- Avaliação de alguns parâmetros relativos ao estado ecológico do Rio Tinto: monitorização relatório finalPublication . Jesus, Teresa Maria Gonçalves Moreira de; Monteiro, Álvaro; Guerreiro, Maria João; Abreu, Isabel; Amado, Ana; Abreu, CristinaO presente relatório foi realizado no âmbito do Projeto de Avaliação de Alguns Parâmetros Relativos ao Estado Ecológico do Rio Tinto e tem como principal objetivo apresentar os resultados obtidos ao longo de dois anos de monitorização. De Outubro de 2013 a Setembro de 2015 foram efetuadas deslocações mensais ao rio Tinto para análise in loco de alguns parâmetros hidro-morfológicos e físico-químicos e para recolha de amostras de água e de substrato do leito do rio. A análise laboratorial compreendeu a determinação de parâmetros físico-químicos, microbiológicos e análise da comunidade de macroinvertebrados bentónicos. Realizou-se uma análise sumária da variação espacial dos parâmetros analisados e calcularam-se índices de qualidade hidro-morfológica, de qualidade ripícola e de qualidade biológica da água. Paralelamente a este estudo, percorreu-se o leito do rio Tinto em três troços (Valongo/Maia, Gondomar, Porto) com representantes dos parceiros do projeto diretamente relacionados com os setores de rio em causa. Pretendeu-se atualizar o conhecimento de todo o seu percurso e identificar os principais focos de perturbação do mesmo. Os dados obtidos confirmam que o rio Tinto se encontra degradado, sofre pressões provocadas pela ocupação das margens por áreas urbanas, industriais e agrícolas, pela presença de problemas a nível das redes de saneamento e das águas pluviais, afluentes com níveis de poluição elevada, pela deterioração das suas margens e pelas estruturas de regularização do seu percurso.
- Perceived importance of sustainability dimensions in the Portuguese metal industryPublication . Armindo, J.; Fonseca, Ana; Abreu, Isabel; Toldy, Teresa MartinhoThe growing interest of stakeholders regarding the contribution of organizations to Sustainable Development is influencing organizational behavior and strategic planning. The purpose of the present paper is to analyze the perception of the importance of organizational sustainability dimensions in a relevant economic sector: the metal industry. Survey data was collected from a sample of 211 Portuguese industries, and non-parametric statistical tests were used to validate five research hypotheses regarding the importance of the economic, environmental, social and cultural dimensions of sustainability. The results obtained demonstrate awareness of the sampled industries regarding all sustainability dimensions, recognizing that their importance has been increasing over the years, and prospecting that this importance will continue to increase in the future. The industries in this sample revealed different degrees of perceived importance for the different sustainability dimensions: the highest importance was given to the economic dimension, and culture was considered the least important sustainability dimension. However, the perception of the respondents is that these differences will be less relevant in the future. The results also show that companies with certified management systems reveal a higher perceived importance regarding sustainability dimensions. Also, industries with higher values of annual turnover, number of employees and export sales tend to give higher degrees of importance to sustainability dimensions. Considering the economic, environmental and social impacts of metal industries at an international level, the awareness of this industrial sector regarding the importance of sustainability is a relevant step to the commitment towards Sustainable Development.
- Indoor air quality in healthcare units - a systematic literature review focusing recent researchPublication . Fonseca, Ana; Abreu, Isabel; Guerreiro, Maria João; Barros, NelsonThe adequate assessment and management of indoor air quality in healthcare facilities is of utmost importance for patient safety and occupational health purposes. This study aims to identify the recent trends of research on the topic through a systematic literature review following the preferred reporting items for systematic reviews and meta-analyses (PRISMA) methodology. A total of 171 articles published in the period 2015–2020 were selected and analyzed. Results show that there is a worldwide growing research interest in this subject, dispersed in a wide variety of scientific journals. A textometric analysis using the IRaMuTeQ software revealed four clusters of topics in the sampled articles: physicochemical pollutants, design and management of infrastructures, environmental control measures, and microbiological contamination. The studies focus mainly on hospital facilities, but there is also research interest in primary care centers and dental clinics. The majority of the analyzed articles (85%) report experimental data, with the most frequently measured parameters being related to environmental quality (temperature and relative humidity), microbiological load, CO2 and particulate matter. Non-compliance with the WHO guidelines for indoor air quality is frequently reported. This study provides an overview of the recent literature on this topic, identifying promising lines of research to improve indoor air quality in healthcare facilities.
- Investigating context factors in the strategic management of corporate sustainability integrationPublication . Fonseca, Ana; Abreu, Isabel; Silvestre, Winston JerónimoAdequately understanding the role of context factors in the successful development of corporate sustainability-oriented initiatives is an important step towards an integrative vision of sustainability at the organizational level. In the present research, an extensive and structured literature review enabled the identification of 19 context factors relevant for sustainability integration processes. The importance of these context factors was confirmed through a quantitative exploratory research with 156 experienced sustainability professionals from 42 different countries. The results obtained reveal that Commitment, Engagement, Information, Communication and Trust have the highest levels of perceived importance. The results also indicate that the relative importance of these context factors is higher for small and medium sized companies and for companies located in countries with lower Gross Domestic Product. The role of the context factors was analyzed on the scope of the operational stages of a strategic management framework focusing corporate sustainability integration – the Integrative Sustainability Intelligence model. The main contributions of this paper are: the identification of context factors relevant for corporate sustainability integration processes, combining the perspectives of scholars and sustainability professionals; the analysis of the role of the most relevant context factors in the strategic management of corporate sustainability integration processes, enabling the identification of pathways to promote their successful operationalization.
- Comparative statistical analysis new urban road pavement versus conventional pavement of pervious concretePublication . de Oliveira, Evailton Arantes; Guerreiro, Maria João; Abreu, Isabel; Dinis, Maria Alzira PimentaThis research proposes a variation to pervious concrete pavement, in which a mixture of cement, aggregates and water includes calcium hydroxide additive (Ca(OH)2). This new approach focuses on two main environmental functions: increased permeability of urban soil favoring a decrease of total and peak runoff and resulting reduction of flood occurrence in the cities, and CO2 absorption from the atmosphere, contributing to reduction of the negative impacts caused by the observed increased greenhouse effect in the cities. A series of 40 conventional pervious concrete pavement samples and 30 specimens of the proposed urban pavement were tested in the laboratory for permeability, density, porosity and compression resistance, and monitored for CO2 absorption. Results show that there is an environmental benefit of CO2 sequestration when adding Ca(OH)2 to pervious concrete, but there is also a decrease in its compressive strength and permeability.