47 documents found, page 1 of 5
Construct hunting in GovTech research: an exploratory data analysis
Svahn, Mattias; Larsson, Aron; Macedo, Eloísa; Bandeira, JorgeThe concept of “GovTech” has emerged as a business-oriented model and practice for enabling the public sector to take advantage of digital solutions as service towards the citizen, while the private for-profit sector is responsible for innovation, development, and profitable maintenance of the GovTech services, hence making the whole area of solutions seemingly desirable to invest in. However, the current liter...
A glimpse on the contributions and challenges towards more environmentally-frie...
Macedo, Eloísa; Bandeira, JorgeManaging a complex system such as a road transport network, is not easy and requires efficient Operational Research procedures. In this context, modelling and simulation play a key role for planning, managing and anticipate impacts by testing different scenarios. New emerging technologies and ever-increasing level of automated in-vehicle functions are expected to provide benefits in terms of reducing pollutant ...
Experimental evaluation of gear-shift and internal-combustion engine variables ...
Macedo, Eloísa; Pascale, Antonio; Ferreira, Elisabete; Guarnaccia, Claudio; Coelho, Margarida C.Although variability of noise and pollutant emissions are usually associated with vehicular speed and acceleration, driving style, mainly related to gear-shift and internal engine variables such as revolutions per minute (RPM) or engine load (EL), can also play a key role. Moreover, the contribution of each variable for fuel consumption, noise and pollutant emissions can vary for different vehicle-motorization ...
Mapping of individual transportation traffic-related externalities in an interc...
Sampaio, Carlos; Coelho, Margarida C.; Macedo, Eloísa; Bandeira, Jorge M.There has been an increasing trend in private vehicle ownership. Despite the flexibility, convenience, and comfort-related advantages of individual transportation, it also represents some negative impacts. This paper proposes a methodology to map the individual transportation traffic-related externalities in an intercity corridor. For that purpose, PTV VISUM is used to develop a transport model. The externaliti...
Characterization of European regional mobility ecosystems towards sustainable MaaS
Macedo, Eloísa; Teixeira, João; Bandeira, JorgeNo abstract available.
Micro driving behaviour in different roundabout layouts: pollutant emissions, v...
Bahmankhah, Behnam; Macedo, Eloísa; Fernandes, Paulo; Coelho, Margarida C.Driving behaviour affects both road safety and the environment, either positively or negatively. An unsafe driving behaviour characterized by hard acceleration/braking (also called driving volatility) can lead to an increase in emissions. Driving volatility can occur due to driving style, traffic, or road conditions. Although roundabouts present better safety performance than other traffic-control treatments, d...
Clustering and disjoint principal component analysis of emissions and driving v...
Fernandes, Paulo; Macedo, Eloísa; Tomás, Ricardo F.; Coelho, Margarida C.Despite the fuel use and emission benefits of Hybrid Electric Vehicles (HEVs), few studies have characterized in detail emission patterns and driving volatility profiles from HEVs in different road types under Real Driving Emission (RDE) conditions. This paper characterized second-by-second tailpipe emissions, vehicle engine, and dynamics from a 2020 Toyota HEV sub-compact on a 44 km driving route over rural, u...
Biplots of kinematic variables and pollutant emissions for an intercity corridor
Ferreira, Elisabete; Macedo, Eloísa; Fernandes, Paulo; Bahmankhah, Behnam; Coelho, Margarida C.A thorough understanding of driver behavior is an important step to improve the environmental performance of road traffic. Accurate data analysis tools can be valuable to identify these concerns. The present study explores relationships between driving patterns, tailpipe emissions, and road differentiation by using Principal Component Analysis Biplot. This statistical methodology is suitable to identify pattern...
Safety and emissions algorithms for the interaction between motor vehicles and ...
Ferreira, Elisabete; Macedo, Eloísa; Coelho, Margarida C.Road traffic has been responsible for high levels of pollutant emissions, several injuries and deaths. Many studies have been focused on safety or emissions issues, but an integrated approach considering safety-emission hotspots is rather rare, particularly, with respect to impacts involving Vulnerable Road Users (VRU), such as pedestrians and cyclists. The recent advancements in technology and in vehicle autom...
Exploring new ways to charge intercity mobility: impact on road traffic externa...
Sampaio, Carlos; Coelho, Margarida C.; Macedo, Eloísa; Bandeira, Jorge M.Around 70% of transport-related emissions in the EU (European Union) came from road transportation. A major contribution to the transport-related emission externalities comes from all the passenger car trips generated in intercity corridors. In Portugal, these trips represent 65% of the kilometers travelled and more than 55% of CO2 and NOx emissions. Portugal is the second worst country withing EU, only followe...