Ciências e Tecnologia / Sciences and Technology
Permanent URI for this community
Browse
Browsing Ciências e Tecnologia / Sciences and Technology by Sustainable Development Goals (SDG) "11:Cidades e Comunidades Sustentáveis"
Now showing 1 - 10 of 33
Results Per Page
Sort Options
- Benchmarking city layouts: a methodological approach and an accessibility comparison between a real city and the garden cityPublication . Monteiro, João Pedro Medina; Sousa, Nuno; Jesus, Eduardo Natividade; Rodrigues, João CoutinhoThis article presents a comparative accessibility study between a real city and its redraft as a Garden City. The benchmarking methodology involves defining and evaluating a location-based accessibility indicator in a GIS environment for the city of Coimbra, Portugal, and for the same city laid out as a Garden City, with the same number of inhabitants, jobs, and similar number of urban facilities. The results are derived as maps and weighted average distances per inhabitant to the facilities and jobs, and show that, for the Garden City, average distances drop to around 500 m for urban facilities and 1500 m for the combination of facilities and jobs, making much of the city accessible by walking and practically the whole of it accessible by cycling, with positive impact on transport sustainability and accessibility equity. The methodology can be extended to other benchmarking indicators and city layouts, and the quantitative results it yields make a valuable contribution to the debate on the ideal layout of cities. Moreover, it gives directions on how to improve real cities to address current and future sustainability concerns.
- Benchmarking real and ideal cities: a multicriteria analysis of city performance based on urban formPublication . Monteiro, João Pedro Medina; Sousa, Nuno; Rodrigues, João Coutinho; Jesus, Eduardo NatividadeThe debate on the ideal urban layout, or form has long been an active topic of research. As cities expand and population demands rise, the quest for efficient and sustainable urban designs gains greater significance, necessitating objective and quantitative evaluation of their performance. This article adds to the debate by presenting a multicriteria analysis of city performance, based on quantitative indicators obtainable from geographic information systems calculations, which focus on sustainability and physical pleasantness issues. Indicator values were derived for a real city, its infill version, and five redrafts as classic city models existing in the literature. The city layouts were then compared using the TOPSIS multicriteria ranking method, results showing a preference for the more compact urban layouts due to the multiple advantages of having shorter distances between supply and demand points. The methodology provides quantitative insights on city performance and efficiency and can be used to compare options for city expansions or major urban regeneration projects.
- Catalogue of Cenozoic echinoid type specimens in the Geological Museum (Lisbon, Portugal)Publication . Pereira, PedroThe present catalogue lists the Cenozoic echinoid type specimens housed in the collections of the Geological Museum (Lisbon, Portugal). This material comprises a total of 69 type specimens (seven holotypes, one paratype, 52 syntypes, two lectotypes, and seven paralectotypes) of fifteen Miocene species from Angola and Portugal. Additionally, it is considered that Echinolampas (Echinolampas) maxima de Loriol, 1896 is a valid species and E. (E.) barcinensis Lambert, 1907 is its junior synonym.
- Challenges ahead for sustainable cities: an urban form and transport system reviewPublication . Medina Monteiro, João Pedro; Sousa, Nuno; Coutinho-Rodrigues, João; Natividade-Jesus, EduardoThis article reviews the critical issues surrounding the development of sustainable urban environments, focusing on the impact of transport and urban form on energy consumption and greenhouse gas emissions. The aim is to provide an overview of the state-of-the-art on the subject and to unravel what directions the literature suggests for sustainable urban planning. Current research and practices are synthesized, highlighting the interdependence of urban design and transportation systems in achieving sustainability goals. Important dimensions and practices of city planning and transport policies are explored, including urban form, urban sprawl, mixed land use, densification and infill, and urban public spaces, and how these directly influence transport dynamics, including modal choices and energy consumption. Innovative approaches in urban planning, such as transit-oriented development, and technological advancements, such as electric mobility, are also examined and their potential roles in sustainable urban transport. The conclusion underscores the urgency of adopting holistic and adaptable strategies to foster sustainable urban environments, calling for concerted efforts from policymakers, urban planners, and communities. Awareness of the conclusions can help municipal decision-makers in planning their cities for a sustainable future. Finally, the authors analyze important directions for future research and practical applications towards developing cities that are environmentally sound, socially equitable, and economically viable.
- Context-aware mobile applications in Fog Infrastructure: a literature reviewPublication . Barros, Celestino Lopes de; Rocio, Vitor; Sousa, André; Paredes, HugoToday’s cloud computing techniques are becoming unsustainable for real time applications as very low latency is required with billions of connected devices. New paradigms are arising; the one that offers an integrated solution for extending cloud resources to the edge of the network and addresses current cloud issues is Fog Computing. Performing Fog Computing brings a set of challenges such as: provisioning edge nodes to perform task volumes downloaded from the Cloud; placing task volumes on edge nodes; resource management on edge nodes; need for a new programming model; programming, resource management, data consistency service discovery challenges; privacy and security and improving the quality of service (QoS) and user experience (QoE). This paper aims at introducing the Fog Computing concept and it presents a literature review on the way it is applied: context-sensitive applications and context-sensitive mobile service platforms. The result of the study is presented as the current research challenges for context aware mobile applications in Fog Computing infrastructure.
- Do people adapt to where they live?: a comparative analysis of perceived physical urban pleasantness using a quantitative modelPublication . Medina Monteiro, João Pedro; Sousa, Nuno; Natividade-Jesus, Eduardo; Coutinho-Rodrigues, João; Oliveira, Leise Kelli; Santos, Patrícia da SilvaThis article examines the question of whether people perceive their own urban environment more favourably than people from other urban environments, i.e., whether residents, in a sense, adapt to where they live. To analyse this question, a quantitative statistical model that uses geometric and land use elements was applied to a case study of Belo Horizonte, Brazil, to estimate the perception of physical pleasantness of the urban environment using two calibrations: a global one and one obtained from a survey carried out in Belo Horizonte. The article then contrasts findings specific to Belo Horizonte with global perceptions, highlighting that local residents tend to evaluate their city's geometry and land use more positively than a worldwide audience. This difference suggests that familiarity and acclimatisation to the urban environment can significantly influence residents’ perceptions of their physical living environment.
- Do we live where it is pleasant?: correlates of perceived pleasantness with socioeconomic variablesPublication . Monteiro, João Pedro Medina; Carrilho, Ana Clara; Sousa, Nuno; Oliveira, Leise Kelli; Jesus, Eduardo Natividade; Rodrigues, João CoutinhoLiving in urban areas is the wish of many people. However, with population growth in those areas, quality of life has become a concerning element for achieving sustainable cities. Because quality of life is influenced by the built environment, the state of the latter is a fundamental issue for public policies. This research expands on previous research on the perceived pleasantness of built environments by presenting a large-scale case study of the urban layout pleasantness in the central area of Belo Horizonte, Brazil, a typical global south city, and correlating pleasantness scores with socioeconomic factors to understand whether people do in fact live where the urban layout is more pleasant and how pleasantness and socioeconomic factors relate and contribute to one’s choice of living location. A comparison with the city of Coimbra, Portugal, representative of the global north, was also carried out. The findings showed that pleasantness tended to correlate negatively with urban density and positively with income. Possible explanations for these results and their generality are advanced.
- Environmental and sustainability impact assessment in small islands : the case of Azores and MadeiraPublication . Ramos, Tomás B.; Caeiro, Sandra; Douglas, Calbert H.; Ochieng, CockerThis paper compares Environmental Impact Assessment (EIA) practices and effectiveness in the Portuguese islands of the Azores and Madeira. This was accomplished by qualitative appraisal and evaluation of the contents of EIA statements and the characterisation of the EIA practices. Data was collected from the islands’ regional environmental agencies and from the Environmental Portuguese Agency internet database. The findings reveal that most EIA project practitioners and consultants in the islands are associated with the regional government agencies. Proposals were generally approved with ‘conditions’ and the diversity of project types were lower in the islands than in the mainland. There was limited follow-up on the EIA process so that evaluation of conditions compliance was scanty. Key areas identified for consideration in the development of good impact assessment practice in the islands included, the Islands’ unique geographical and ecological characteristics, scale effects, intra-insular regional dimension, impact significance evaluation approaches, and training, education and development skills in EIA processes.
- Filling in the spaces: compactifying cities towards accessibility and active transportPublication . Monteiro, João Pedro Medina; Para, Marvin; Sousa, Nuno; Jesus, Eduardo Natividade; Ostorero, Carlo; Rodrigues, João CoutinhoCompactification of cities, i.e., the opposite of urban sprawl, has been increasingly presented in the literature as a possible solution to reduce the carbon footprint and promote the sustainability of current urban environments. Compact environments have higher concentrations of interaction opportunities, smaller distances to them, and the potential for increased active mode shares, leading to less transport-related energy consumption and associated emissions. This article presents a GIS- based quantitative methodology to estimate on how much can be gained in that respect if vacant spaces within a city were urbanized, according to the municipal master plan, using four indicators: accessibility, active modal share, transport energy consumption, and a 15-minute city analysis. The methodology is applied to a case study, in which the city of Coimbra, Portugal, and a compact version of itself are compared. Results show the compact layout improves all indicators, with averages per inhabitant improving by 20% to 92%, depending on the scenario assumed for cycling, and is more equitable.
- A gestão dos resíduos urbanos no município de Teresópolis: uma avaliação socioambientalPublication . Gomes, Natalia; Carapeto, CristinaEm 1987, o Relatório Brundtland apontou a necessidade de promover o crescimento sustentável, uma vez que a escalada populacional e industrial estavam causando enormes desafios ao meio ambiente. A geração de resíduos excedentes no Brasil é reflexo de uma política de alto consumo que esgota os recursos não renováveis, causando desequilíbrios ambientais e problemas associados ao descarte inadequado de resíduos urbanos. Por isso, a busca por soluções adequadas para o tratamento e disposição final dos resíduos é alvo das políticas setoriais no Brasil e no mundo. Em Teresópolis, o Aterro Sanitário da Prata é o local de disposição final dos resíduos sólidos urbanos. Devido às condições precárias e ao mau funcionamento, o Aterro acaba sendo um lixão e, consequentemente, não corresponde à Política Nacional de Resíduos Sólidos, gerando impactos sociais e ambientais. A identificação dos custos socioambientais da gestão do aterro sanitário de Teresópolis e a busca de possíveis soluções para solucionar ou melhorar a situação sanitária atual foram identificadas com uma investigação exploratória e dados de levantamentos juntamente com pesquisa documental e visitas ao local.