7 documents found, page 1 of 1
Unfocused laser ignition of high-pressure He–H2-O2 combustible mixtures
Grosso Ferreira, R.; Carvalho, B.; Rodrigues, José-António; Rodrigues, R.; Smith, A.; Marraffa, L.; Lino da Silva, M.We report consistent ignition of high-pressure (p(fill)>20-30 bar) hydrogen-oxygen mixtures diluted with helium in two different combustion vessels, using an unfocused Nd:YAG laser. This corresponds to laser irradiances several orders of magnitude below the minimum ignition energies reported in the literature. This unusual phenomena has led us to try to measure the amount of laser radiation absorbed by the gas ...
Analyzing a fleet solution using scenarios
Martins, A. L.; Nunes, A. C.; Carvalho, B.Transportation is one of the most important logistics activities, accounting for a significant part of the logistics costs and with high level of impact in terms of the service level provided to the customer. To counteract the upward trend in costs, it is fundamental to identify a transport strategy that can reduce costs and, at the same time, does not adversely affect the service levels agreed with customers. ...
N-expansive homeomorphisms with the shadowing property
Carvalho, B.; Cordeiro, W.We discuss the dynamics of n-expansive homeomorphisms with the shadowing property defined on compact metric spaces. For every n∈N, we exhibit an n-expansive homeomorphism, which is not (n−1)-expansive, has the shadowing property and admits an infinite number of chain-recurrent classes. We discuss some properties of the local stable (unstable) sets of n-expansive homeomorphisms with the shadowing property and us...
Ser ou não ser praxado? A teoria da ação planeada como modelo para compreender ...
Correia, I.; Alves, D.; Jarego, M.; Lopes, K.; Rodrigues, D.; Abrantes, L.; Boloca, A.; Carvalho, B.; Diogo, M.; Grosso, C.; Massa, M. F.; Mateus, R.Com este estudo pretendemos investigar quais são os preditores da intenção de participação dos caloiros na praxe académica. Para tal, recorremos à teoria da ação planeada (Ajzen, 1991) que permite analisar o peso relativo das atitudes, da norma subjetiva, e do controlo comportamental percebido nas intenções de ser praxado. Os participantes, estudantes universitários (N = 353) a frequentar o 1º ano de uma Licenc...
Accessibility and trust: the two dimensions of consumers perception on sustaina...
Carvalho, B.; Salgueiro, M. F.; Rita, P.The aim of this article is to shed new light on which dimensions compose sustainable purchase intention (SPI) with the purpose of understanding what moves consumers to a potentially more sustainable behaviour. Even though several studies have researched which factors influence consumer’s intention to buy in a more sustainable way, no comparable research in consumer behaviour was found studying these dimensions ...
A Cyber Infrastructure for the SKA Telescope Manager
Barbosa, D; Barraca, J. P.; Carvalho, B.; Maia, D.; Gupta, Y.; Natarajan, S.; Le Roux, G.; Swart, P.The Square Kilometre Array Telescope Manager (SKA TM) will be responsible for assisting the SKA Operations and Observation Management, carrying out System diagnosis and collecting Monitoring & Control data from the SKA subsystems and components. To provide adequate compute resources, scalability, operation continuity and high availability, as well as strict Quality of Service, the TM cyber-infrastructure (embod...
Power Monitoring and Control for Large Scale projects: SKA, a case study
Barbosa, D; Barraca, J. P.; Maia, D.; Carvalho, B.; Vieira, J.; Swart, P.; Le Roux, G.; Natarajan, S.; van Ardenne, A.; Seca, L.Large sensor-based science infrastructures for radio astronomy like the SKA will be among the most intensive data driven projects in the world, facing very high demanding computation, storage, management, and above all power demands The geographically wide distribution of the SKA and and its associated processing requirements in the form of tailored High Performance Computing (HPC) facilities, require a Greener...