Isabel Silva
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Isabel Silva has a total of 4 co-authors. Here are the top co-authors by number of shared publications:
- Antonio Albuquerque
GeoBioTec, Department of Civil Engineering and Architecture, University of Beira Interior, 6201-001 Covilhã, Portugal
2 shared publications - João Castro-Gomes
C-MADE, The Centre of Materials and Civil Engineering for Sustainability, Universidade da Beira Interior (UBI), 6201-001 Covilhã, Portugal
2 shared publications Jose Antonio Alves Coelho Tome
Escola Secundaria de Amato Lusitano, ESAL, Castelo Branco, Portugal
1 shared publication- Maria Cristina Canavarro Teixeira
UTC de Recursos Naturais e Desenvolvimento Sustentável, Polytechnic Institute of Castelo Branco
1 shared publication
Latest Publications
- 1 June 2014
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1-5
The formation of mega-clusters of schools with coverage criteria. A case study in the town of Castelo Branco
The polemic fusion of the Schools in mega-clusters has been the focus of many stakeholders in the process, interested mainly in understanding the underlying criteria to this merger. In Castelo Branco there were four groups taking the name of the school that became their headquarters: Afonso de Paiva, Faria de Vasconcelos, Cidade de Castelo Branco and João Roiz. Out of this process there were two secondary schools in the city: Nuno Alvares and Amato Lusitano. These schools were georeferenced in the city road network, previously scanned. The ArcGIS software and Network Analyst extension were used. They allowed addressing the issue of the formation of mega-clusters by analyzing the network, namely by solving coverage problems with time and distance criteria. Heuristically, a found solution consisted in grouping three schools belonging to the west axis of the city and in the creation of a second mega-group for the remaining three schools. This solution presents a balanced distribution of the school population, since the difference between these two mega-groups corresponds to about 2% of the total population.
- 1 June 2014
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1-5
The formation of mega-clusters of schools with coverage criteria. A case study in the town of Castelo Branco
The polemic fusion of the Schools in mega-clusters has been the focus of many stakeholders in the process, interested mainly in understanding the underlying criteria to this merger. In Castelo Branco there were four groups taking the name of the school that became their headquarters: Afonso de Paiva, Faria de Vasconcelos, Cidade de Castelo Branco and João Roiz. Out of this process there were two secondary schools in the city: Nuno Alvares and Amato Lusitano. These schools were georeferenced in the city road network, previously scanned. The ArcGIS software and Network Analyst extension were used. They allowed addressing the issue of the formation of mega-clusters by analyzing the network, namely by solving coverage problems with time and distance criteria. Heuristically, a found solution consisted in grouping three schools belonging to the west axis of the city and in the creation of a second mega-group for the remaining three schools. This solution presents a balanced distribution of the school population, since the difference between these two mega-groups corresponds to about 2% of the total population.
- 1 October 2012
- Published by Elsevier in Construction and Building Materials
- Vol. 35, 117-124
Effect of immersion in water partially alkali-activated materials obtained of tungsten mine waste mud
- 1 October 2012
- Published by Elsevier in Construction and Building Materials
- Vol. 35, 117-124
Effect of immersion in water partially alkali-activated materials obtained of tungsten mine waste mud
- 1 June 2012
- Published by American Society of Civil Engineers (ASCE) in Journal of Materials in Civil Engineering
- Vol. 24 (6) , 623-628
Mineral Waste Geopolymeric Artificial Aggregates as Alternative Materials for Wastewater-Treatment Processes: Study of Structural Stability and pH Variation in Water
Artificial aggregates produced from mine waste geopolymeric binders were studied as a potential substrate for fixed-film wastewater-treatment processes (biofilm reactors). Waste geopolymeric artificial aggregates (WGA) of 2–3 cm in size were produced using geopolymeric mine waste mud as a precursor and both sodium silicate and sodium hydroxide as alkaline activators. Seven mixtures were produced with different atomic ratios of sodium silicate to sodium hydroxide (S/H) and of precursor (waste mud) to sodium silicate (P/S), using curing temperatures of 20°C and 130°C, for a total of 112 samples. Structural stability and pH variation after immersion in water were observed over an 18-week period. The results showed that the initial water pH decreased with the increase of the curing time, taking between 17 and 42 days to reach pH 8. The mixture cured at 20°C for 28 days appears to be suitable for use as a substrate for biofilm reactors because the initial water pH was one of the lowest (approximately p...
- 1 June 2012
- Published by American Society of Civil Engineers (ASCE) in Journal of Materials in Civil Engineering
- Vol. 24 (6) , 623-628
Mineral Waste Geopolymeric Artificial Aggregates as Alternative Materials for Wastewater-Treatment Processes: Study of Structural Stability and pH Variation in Water
Artificial aggregates produced from mine waste geopolymeric binders were studied as a potential substrate for fixed-film wastewater-treatment processes (biofilm reactors). Waste geopolymeric artificial aggregates (WGA) of 2–3 cm in size were produced using geopolymeric mine waste mud as a precursor and both sodium silicate and sodium hydroxide as alkaline activators. Seven mixtures were produced with different atomic ratios of sodium silicate to sodium hydroxide (S/H) and of precursor (waste mud) to sodium silicate (P/S), using curing temperatures of 20°C and 130°C, for a total of 112 samples. Structural stability and pH variation after immersion in water were observed over an 18-week period. The results showed that the initial water pH decreased with the increase of the curing time, taking between 17 and 42 days to reach pH 8. The mixture cured at 20°C for 28 days appears to be suitable for use as a substrate for biofilm reactors because the initial water pH was one of the lowest (approximately p...