Loading...
3 results
Search Results
Now showing 1 - 3 of 3
- Enabling factors for the competitiveness of the Portuguese automotive industryPublication . Fonseca, Luís; Fernandes, Jorge; Ramos, SandraThe Portuguese automotive industry is a relevant activity sector for the Portuguese society and economy, both in job creation and value-added generation, contributing to the country’s economic development. The automotive is a high challenge industry, with intense competition, a high number of brands, increased number of models and vehicles, tighter regulatory requirements (e.g., emissions), and the need to manage global supplier networks. To succeed in such a highly complex and interconnected industry requires firms to be globally competitive since most of the production of this industry is destined for the rest of the world through export. This research aims to investigate the factors that contribute to value creation and competitiveness of the Portuguese automotive industry. Following the literature review of competitive advantage theories, quantitative research was done through an online questionnaire with Portuguese auto industry firms, to validate the proposed research hypotheses. The statistical analysis of the results, based on the application of descriptive statistics methodologies, principal components analysis, and correlation analysis, allowed to conclude that in this industry sector, the adoption of a strategy of differentiation/focalization and the external context influence value creation. However, it was not possible to conclude if the specific characteristics of the organization influences, or not, the creation of value. From the theoretical point of view, the conclusions demonstrate the relevance of the adoption of a strategy of differentiation and focalization and the external context for the competitiveness of these firms, supporting the assumptions of Porter’s Industry Based Theory and Generic strategies. From the practical point of view, the results highlight the importance of monitoring the external context and investing in research and development, brand image and market expertise, with the aim of enhancing the value creation and competitiveness of the components, tools, and services providers firms of the Portuguese automotive sector.
- Monitoring survey of caffeine in surface waters (Lis River) and wastewaters located at Leiria Town in PortugalPublication . Paíga, Paula; Ramos, Sandra; Jorge, Sandra; Silva, Jaime Gabriel; Delerue-Matos, CristinaInvestigation during 11-month period was performed to study the presence of caffeine in the Lis River in Leiria Town in Portugal, and a monitoring during 9-month period was realized to check the contribution of the human pollution of two wastewater treatment plants (WWTPs) that discharge their effluents to the studied river. The samples were collected in five sampling points along the river and in two influents and two effluents of the studied WWTPs. Caffeine was detected in all ninety-one collected samples. The caffeine concentration ranged from 25.3 to 321 ng/L in the river samples, from 112 to 1927 ng/L in the WWTP effluents, and from 9478 to 83,901 ng/L in the WWTP influents. The highest concentration in the river was detected in the two sampling points located after the effluent discharge points and reached 315 and 321 ng/L. Risk assessment was performed for three trophic levels using the risk quotient calculation and revealed that caffeine do not cause toxic effect on Daphnia magna and on fish but could be possibly toxic to algae. The results proved that caffeine can be an effective indicator of human-born pollution.
- Green zero valent iron nanoparticles dispersion through a sandy column using different injection sequencesPublication . Soares, António Alves; Ramos, Sandra; Albergaria, José Tomás; Delerue-Matos, CristinaThe contamination of soils is a global environmental problem that urges an increased effort to recover polluted sites. In Europe, there are an estimated 20,000 polluted sites that need to be remediated and around 350,000 sites that are classified as potentially contaminated by the European Environment Agency (EEA). Remediation is a part of the solution to this problem, requiring the most innovative and sustainable technologies. In this context, the use of zero valent iron nanoparticles (nZVI) is a promising, low cost and efficient technology for the remediation of soil and groundwater contaminated with a wide range of organic and inorganic pollutants. Among the nZVIs, the ones produced using Green synthesis methods (green nZVIs (gnZVI)) using natural extracts, such as green tea, are increasingly considered an alternative technology for the future. However, there are issues related to the application of gnZVI in soil that are still not fully understood, requiring further research, among these is the study of their transport in soils. Therefore, this work aims to study the transport of gnZVIs in sandy soils under diverse conditions such as soil particle size, soil saturation level and injection sequence. Several experiments were performed in an acrylic column with two sandy soils with different particle sizes (between 0.5 and 1.0 mm and higher than 1.0 mm), using two distinct water saturation conditions (saturated and dry) and four injection sequences. After these tests the distribution of the gnZVI along the soil column was determined by atomic absorption spectroscopy. This work allowed concluding that the injection sequence might be one of the most important factors influencing the rate of nZVI dispersion through a sandy column. According to the results it was possible to propose, for distinct types of contamination (deep, superficial, hot spot or dispersed), the most appropriate injection sequence.