Encontrados 9 documentos, a visualizar página 1 de 1
Multi-impact evaluation of new medium and large hydropower plants in Portugal c...
Almeida, Aníbal T. de; Moura, Pedro S.; Marques, Alféu S.; Almeida, José L. deTraditionally, the decision criteria when analyzing hydropower plants projects, has been based mostly on technical and economical analyses focused on the electric production aspects. Nowadays a broader approach is necessary, which takes into consideration multiple impacts such as:- Energy impacts;- Water resources impacts;- Social-economics development impacts;- Agricultural sector impacts;- Environmental impac...
Multisensor Demining Robot
Rachkov, Michael Yu.; Marques, Lino; Almeida, Aníbal T. deThe paper describes an advanced multisensor demining robot. The robot transport system is based on a simple structure using pneumatic drive elements. The robot has robust design and can carry demining equipment up to 100 kg over rough terrains. Due to the adaptive possibilities of pedipulators to obstacles, the robot can adjust the working position of the demining sensors while searching for mines. The detectio...
Examining the potential of natural gas demand-side measures to benefit customer...
Almeida, Aníbal T. de; Lopes, Ana Cristina; Carvalho, Anabela; Mariano, Jorge; Jahn, Andreas; Broege, MichaelThe aim of this paper is to demonstrate how integrated resource planning (IRP) oriented to the gas sector can be applied both in new networks and in mature networks, and to present the advantages of its application. One case study is described, in the western central region of Portugal, to illustrate the results of a pilot project on natural gas IRP implementation in a new network in the European Union (EU). Th...
Evaluation of fuel-switching opportunities in the residential sector
Almeida, Aníbal T. de; Lopes, Ana; Carvalho, Anabela; Mariano, Jorge; Nunes, CatarinaThe aim of this paper is to analyse the impact of different natural gas and electricity end-use technologies in the residential sector, which compete among themselves in terms of energy consumption and carbon emissions. The analysis of 17 different technology options, which were chosen in order to match the consumption behaviour of a typical Portuguese family, has shown that the use of electric heat pumps, both...
Energy-efficient motor systems in the industrial and in the services sectors in...
Almeida, Aníbal T. de; Fonseca, Paula; Bertoldi, PaoloThis paper shows how electricity is used by electric motors in both the industrial and the services' sectors in the European Union, as well as the potential electricity savings by the year 2015 with the application of Energy-Efficient Motors and Variable Speed Drives. Additionally, the main barriers identified in the field characterization study and the measures to overcome those barriers are presented. ; ht...
Market transformation of energy-efficient motor technologies in the EU
Almeida, Aníbal T. de; Fonseca, Paula; Falkner, Hugh; Bertoldi, PaoloBased on a recent study carried out for the European Union (EU), this paper briefly characterizes the motor electricity end-use consumption in the industrial and in the services sectors, in the EU countries, and estimates the identified electricity savings potential with the application of energy-efficient motor technologies, namely energy-efficient motors, variable speed drives and efficient end-use devices (p...
Olfaction-based mobile robot navigation
Marques, Lino; Nunes, Urbano; Almeida, Aníbal T. deIt is well known that insects and other animals use olfactory senses in a wide variety of behavioural processes, namely to recognize and locate food sources, detect predators, and find mates. This article discusses the gathering of olfactive information and its utilization by a mobile robot to find a specific odour source in a room with turbulent phenomena's and multiple sources of odour. Three navigation algor...
Learning sensor-based navigation of a real mobile robot in unknown worlds
Araújo, Rui; Almeida, Aníbal T. deIn this paper, we address the problem of navigating an autonomous mobile robot in an unknown indoor environment. The parti-game multiresolution learning approach is applied for simultaneous and cooperative construction of a world model, and learning to navigate through an obstacle-free path from a starting position to a known goal region. The paper introduces a new approach, based on the application of the fuzz...
Sensor-based demand-controlled ventilation: a review
Fisk, William J.; Almeida, Aníbal T. deWith sensor-based demand-controlled ventilation (SBDCV), the rate of ventilation is modulated over time based on the signals from indoor air pollutant or occupancy sensors. SBDCV offers two potential advantages: better control of indoor pollutant concentrations, and lower energy use and peak energy demand. Based on theoretical considerations and on a review of literature, SBDCV has the highest potential to be c...
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