ESTG - Comunicações em conferências e congressos internacionais
URI permanente para esta coleção:
Navegar
Percorrer ESTG - Comunicações em conferências e congressos internacionais por Domínios Científicos e Tecnológicos (FOS) "Ciências Naturais"
A mostrar 1 - 4 de 4
Resultados por página
Opções de ordenação
- A methodology to evaluate the performance and consumption of vehicles in comparative on-road testsPublication . Ghodsirad, Mohammadhossein; Teixeira, Joao; Breda, Paulo; Campos, Cristina; Serrano, Luis; Silva, Manuel Gameiro daThe main objective of the reported work was to develop a methodology to assess the fuel consumption and the efficiency of the propulsion system of passenger cars equipped with internal combustion engines in road tests carried out to compare the performance of fuels with different formulations. The examination has been done out in highway travels. A Peugeot 407 HDI station wagon, with a 2,0 liter engine, has been equipped with different measurement systems. The measurement equipment is based upon two vehicle data loggers. A real-time fuel consumption metering system is combined with a GPS logger in order to analyze trip fuel consumption with different conditions in speed and altitude. An OBD II data logger is also mounted and the analog outputs of two pressure sensor are also connected to it. OBD II provides the vehicle and engine information available at the CPU unit, while the pressure sensors are connected to three pressure taps placed on the front of the vehicle to provide information about the relative velocity between the car and the air and the flow angularity. In the test, the impacts of speed, acceleration, road slope and wind disturbance on fuel consumption were analyzed for different fuel formulations. The developed system revealed to be well adapted to the requirements of the research project, allowing an accurate measurement of the fuel consumption and all the relevant parameters related to the vehicle movement. The best compromise in terms of sampling parameters has been achieved with a data acquisition frequency of 10 Hz, being the values decimated to 1 Hz, with the exception of the fuel consumption that is analyzed for 10 s integration intervals.
- Qualitative analysis of the limestone waste potential from the Serra de Aire e Candeeiros quarriesPublication . Monteiro, S. M. C. S.; Jorge, Muanassa; Oliveira, N. S.; Alves, M.L.; Veiga, A.; Silva, A.The mountains of Aires and Candeeiros are part of the Maciço Calcário Estremenho where the landscape is predominantly made up of limestone. The limestone explored in the region has been the driver of social and cultural development, contributing significantly to the local economy. This emerging concern has motivated public and private organisations to develop solutions to improve the sector's sustainability. The present work aims to evaluate the limestone waste potential to produce precipitated (PCC) and ground (GCC) calcium carbonate in the region by surveying the local extraction industries that fulfil the defined minimum requirements to produce high quality PCC and GCC. The results allowed to stablish an estimate of the amount of waste resulting from the extraction process. The conversion of these wastes into PCC or GCC constitutes a possibility of recovery into by-products, allowing use in noble and profitable applications and contributing to the circular economy and the sustainability of the sector.
- Risk Communication for Decision-Making: The Role of Community-Contact, Nature-Positive Outcomes, and Risk-PerceptionPublication . Silva, DorindaAppropriate risk communication is extremely important to ensure stakeholder engagement and avoid fatigue, disengagement and inaction. Research shows that promotion of good news is likely to engage stakeholders and inspire action. Thus, to support properly informed risk communication and decision-making truer perceptions of risks and benefits are needed to enable nature-positive and community inclusivity outcomes. Environmental scientists are now tasked with promoting communication for decision making using methods that weigh harm caused against benefits delivered. Currently we face many planetary threats including from climate change as well as the influx of synthetic chemicals. Creating a nature-positive future in the face of these challenges requires positive messaging, measures, and metrics to guide, plan, assess and communicate regenerative development outcomes beyond toxicology, risk and damage assessment. As various stakeholders perceive risks differently it is of paramount importance to understand and predict how non-experts will react to risk, since the majority of this group are often not aware of the threats faced. Very often a lack of consideration is given to risk perception and behaviours across different stakeholders. Likewise contact with communities is challenging but can help to bridge the gap from scientific discovery to valuable knowledge translation into society, related to environmental risk. The session aims to clarify concepts, challenges, and innovative tools and methods for modelling, measuring, and communicating benefits weighed against risk. The session specifically focuses on accelerating restoration, climate security and preventative measures that have successfully been used to protect the environment and human health from harmful chemicals. Moreover, results of community engagement approaches will be presented allowing the possibility to discuss the associated opportunities and challenges of these communication strategies. Presentations should focus on case studies where community-engagement, nature-positive outcomes, and risk-perception are used to support risk communication for decision making, especially in the presence of limited or conflicting evidence. The session will disseminate valid policy, planning and communication tools and methods across various stakeholders including academics, NGOs, industry and policy makers and overall foster knowledge transfer across groups to deliver and manage regulatory solutions.
- Sustainability study of limestone quarry waste into value-added products: PCC and GCCPublication . Monteiro, S. M. C. S.; Jorge, Muanassa; Heleno, M. L.; Oliveira, N. S.; Alves, M. L.; Veiga, A.; Silva, A.Calcium carbonate can be obtained naturally from limestone, chalk, marble, and other sedimentary rock forms. Ground calcium carbonate (GCC) and precipitated calcium carbonate (PCC) are two materials that can be produced from natural calcium carbonate. The future of GCC and PCC is promising since they are linked to industries with high demand, such as packaging, building & construction, transportation, and industrial applications, with an expected compound annual growth rate higher than 4% until 2027. This research focuses on the production of GCC and PCC through a comparative analysis that identifies the macro conditions that become advantageous to produce and commercialising PCC in a quarry context. This allows a valorisation of the limestone waste resulting from the extraction operations, converting it into by-products of the process. Not all existing limestone quarries in the Serra de Aire e Candeeiros region are suitable sources of raw material to produce PCC. The five extraction poles were identified with the potential for extracting suitable raw materials, associated with several companies dedicated to the extraction operation in these quarries.