3,108 research outputs found

    The Economic Activity in Lisbon. Structural axis and squares

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    The simplifying assumption that the Central Business District is a point or featureless plain, is often made in urban economics. The main goal of this paper is to promote the relaxation of this hypothesis, with the support of empirical evidence, sustaining that the subsequent analysis can be supported on the agglomeration economies theoretical framework. For this purpose we?ve analysed the distribution of economic activity inside the city of Lisbon, using the employment data of ?Quadros de Pessoal do Ministério do Trabalho e Solidariedade? (Employment Datasheet of the Ministry for Social Security and Labour), for 1998. Proceeding with the address matching of this information to the street level in order to allow the use of GIS tools. From the analysis we emphasize the evidence of agglomeration economies inside the Central Business District, using as evidence the different levels of employment agglomeration that occur on different streets and testing the hypothesis that to streets with higher employment concentration correspond higher salary levels. Therefore we sustain that the CBD cannot be seen as a point or a featureless plain and furthermore we?ve verified the existence of an hierarchy inside the urban structure, which can be seen as a parallel of the rank-size rule. After this analysis we argue that the streets with larger employment volume display a structural role in the spatial distribution of economic activity. The final conclusion leads us to consider Lisbon as a squares network-city, where the axis are structural streets and the nodes are structural squares. This paper explores some of the results of the thesis presented for the master degree in Economics and Management of the Territory of The Technical University of Lisbon, made with the orientation of professor M. Brandão Alves. Keywords: Agglomeration Economies; CBD; Lisbon; Urban Economics JEL CLASSIFICATION: R12 e R14.

    The Screw: Between Wearing and Watching

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    Critical Studies: Art, Becoming and Participation marks the launch of the Visual Arts and Critical Studies Group, recently formed within the scope of the Arnaldo Araújo Research Centre (CEAA). The book seeks to rehearse what may become, in the next future, a Brute Theory, whose territories of action remain under definition but whose company we wish to keep along future trajectories. As the singular is a collective, in this publication dispersion overrides the search for any type of unity. Brute Theory, as a pocket of resistance to current models of academic domination anchored in profitable, efficient and, as repeatedly stated, competitive research, proposes precarious dynamics, such as risk and drift.Secção Autónoma de Teoria e História da ESAPinfo:eu-repo/semantics/publishedVersio

    Feed-Back Loop: From Perception to Brain-Time

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    Critical Studies: Art, Becoming and Participation marks the launch of the Visual Arts and Critical Studies Group, recently formed within the scope of the Arnaldo Araújo Research Centre (CEAA). The book seeks to rehearse what may become, in the next future, a Brute Theory, whose territories of action remain under definition but whose company we wish to keep along future trajectories. As the singular is a collective, in this publication dispersion overrides the search for any type of unity. Brute Theory, as a pocket of resistance to current models of academic domination anchored in profitable, efficient and, as repeatedly stated, competitive research, proposes precarious dynamics, such as risk and drift.Secção Autónoma de Teoria e História da ESAPinfo:eu-repo/semantics/publishedVersio

    Bi-objective modeling approach for repairing multiple feature infrastructure systems

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    A bi-objective decision aid model for planning long-term maintenance of infrastructure systems is presented, oriented to interventions on their constituent elements, with two upgrade levels possible for each element (partial/full repairs). The model aims at maximizing benefits and minimizing costs, and its novelty is taking into consideration, and combining, the system/element structure, volume discounts, and socioeconomic factors. The model is tested with field data from 229 sidewalks (systems) and compared to two simpler repair policies, of allowing only partial or full repairs. Results show that the efficiency gains are greater in the lower mid-range budget region. The proposed modeling approach is an innovative tool to optimize cost/benefits for the various repair options and analyze the respective trade-offs.info:eu-repo/semantics/publishedVersio

    Design of evacuation plans for densely urbanised city centres

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    The high population density and tightly packed nature of some city centres make emergency planning for these urban spaces especially important, given the potential for human loss in case of disaster. Historic and recent events have made emergency service planners particularly conscious of the need for preparing evacuation plans in advance. This paper discusses a methodological approach for assisting decision-makers in designing urban evacuation plans. The approach aims at quickly and safely moving the population away from the danger zone into shelters. The plans include determining the number and location of rescue facilities, as well as the paths that people should take from their building to their assigned shelter in case of an occurrence requiring evacuation. The approach is thus of the location–allocation–routing type, through the existing streets network, and takes into account the trade-offs among different aspects of evacuation actions that inevitably come up during the planning stage. All the steps of the procedure are discussed and systematised, along with computational and practical implementation issues, in the context of a case study – the design of evacuation plans for the historical centre of an old European city

    Large scale railway renewal planning with a multiobjective modeling approach

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    Conferência realizada na Filândia, Helsinquia, de 20-24 de agosto de 2018A multiobjective modeling approach for managing large scale railway infrastructure asset renewal is presented. An optimized intervention project schedule is obtained considering operational constraints in a three objectives model: evenly spreading investment throughout multiple years, minimizing total cost, minimizing work start postponements on higher priority railway sections. The MILP model was based on a real world case study; the objectives and constraints specified by an infrastructure management company. Results show that investment spreading greatly influences the other objectives and that total cost fluctuations depend on the overall condition of the railway infrastructure. The model can produce exact efficient solutions in reasonable time, even for very large-sized instances (a test network of similar size to the USA railway network, the largest in the world). The modeling approach is therefore a very useful, practical methodology, for generating optimized solutions and analyzing trade-offs among objectives, easing the task of ultimately selecting a solution and produce the works schedule for field implementation.info:eu-repo/semantics/publishedVersio

    Multi-objective model for optimizing railway infrastructure asset renewal

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    Trabalho inspirado num problema real da empresa Infraestruturas de Portugal, EP.A multi-objective model for managing railway infrastructure asset renewal is presented. The model aims to optimize three objectives, while respecting operational constraints: levelling investment throughout multiple years, minimizing total cost and minimizing work start postponements. Its output is an optimized intervention schedule. The model is based on a case study from a Portuguese infrastructure management company, which specified the objectives and constraints, and reflects management practice on railway infrastructure. The results show that investment levelling greatly influences the other objectives and that total cost fluctuations may range from insignificant to important, depending on the condition of the infrastructure. The results structure is argued to be general and suggests a practical methodology for analysing trade-offs and selecting a solution for implementation.info:eu-repo/semantics/publishedVersio

    Greek tragedy and american western: four case studies

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    Varios autores han llamado nuestra atención sobre la proximidad de la estructura de films como High Noon, de Fred Zinnemann (1952), y la tragedia ática, o The Searchers, de John Ford (1956), y la epopeya homérica. Nuestro estudio tiene como objetivo explorar la relación que se puede establecer entre la tragedia griega, en especial, y el Western, género cinematográfico que funciona como una “mitología para los EEUU”, a partir de cuatro casos. Este análisis se centra sobre todo en: The Furies de Anthony Mann (1950), The Magnificent Seven de John Sturges (1960), Fedra West de Joaquín Romero (1968) y Space Cowboys de Clint Eastwood (2000)Several authors have called our attention to the proximity of the structure of films such as High Noon by Fred Zinnemann (1952) and Attic tragedy, or The Searchers by John Ford (1956), and the Homeric epic. Our study aims to explore the relationship that can be established between Greek tragedy, in particular, and the Western, film genre that works as a “Mythology to the US”, through four cases. This analysis focuses mainly on: The Furies by Anthony Mann (1950), The Magnificent Seven by John Sturges (1960), Fedra West by Joaquín Romero (1968) and Space Cowboys by Clint Eastwood (2000

    New geographic distribution records for Northeastern Atlantic species from Peniche and Berlengas Archipelago

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    During SCUBA dives and intertidal surveys carried out in 2006 and 2007 at Peniche and the Berlengas Archipelago (Portugal), undertaken as part of a research project with the objective of publishing an underwater marine guide, a photographic register of several species not yet recorded for the area was produced. Subsequent identification and bibliographic research confirmed that these records were made beyond the previously known geographic distribution boundaries for each of the species mentioned here

    Implementação de uma rede Wi-Fi

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    Pretende-se com o presente documento abordar as diferentes questões técnicas associadas à implementação de uma Rede WiFi à escala de um Campus Universitário, utilizando como case study o Projecto Campus Virtual do Instituto Politécnico de Bragança - IPB. Serão abordados aspectos como a extensão da Rede de cablagem guiada do Campus para suporte aos equipamentos WiFi, a Autenticação dos utilizadores, a questão da Segurança nesta nova infra-estrutura e novas perspectivas de serviços possíveis com uma infra-estrutura deste tipo
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