A non-pixel image reader for continuous image detection based on tandem heterostructures

An optically addressed read-write sensor based on two stacked p-i-n heterojunctions is analyzed. The device is a two terminal image sensing structure. The charge packets are injected optically into the p-i-n writer and confined at the illuminated regions changing locally the electrical field profile across the p-i-n reader. An optical scanner is used for charge readout. The design allows a continuous readout without the need for pixel-level patterning. The role of light pattern and scanner wavelengths on the readout parameters is analyzed. The optical-to-electrical transfer characteristics show high quantum efficiency, broad spectral response, and reciprocity between light and image signal. A numerical simulation supports the imaging process. A black and white image is acquired with a resolution around 20 mum showing the potentiality of these devices for imaging applications.

Portuguese newspapers’ front-page and the coverage of European Cultural Capital: Porto 2001 and Guimarães 2012

Portugal hosted in the last thirteen years, two editions of the event European Cultural Capital; this paper intends to illustrate the coverage that Portuguese newspapers (daily newspapers Público, Diário de Notícias, Correio da Manhã and Jornal de Notícias, a weekly newsmagazine Visão and a weekly newspaper Expresso) made, through referrals in front-page and respective developments within the editions, to each of the events and that allows us to define the main moments that marked each of them, patterns of action, the major players, planning and programming types. The European Cultural Capital project elects, from year to year, cities of different EU member states with the main goal of “contributing to bring together the Europe´s people" (words of Mélina Mercouri, Greek Minister of Culture who, in 1985, proposed the launch of this initiative) and encouraging the elected urban space to present new cultural paradigms. In the genesis of this model is the cultural decentralization’s vector, a possibility to medium-sized cities of funding public works, restoring heritage and promoting themselves in touristic terms, of giving visibility to cities away from cultural and creative industries’ major distribution centers. A crucial factor to achieve this goal is media coverage. This paper outline the information that the Portuguese press ran over the two years that elapsed the latest editions of the European Cultural Capital in Portugal, namely that media coverage have deviated from the disclosure of the events’ schedule to suggest itineraries of visit and little or not even question the role that cities, promoting such initiatives, have as places of innovation in terms of cultural policies, artistic production and innovation, in urban and environmental regeneration, in economic revitalization, in training and creating new artists and new audiences and in boosting the confidence of local communities. The content analysis performed to articles shows how press is essential to the promotion of cities as cultural/touristic destinations as it stimulates consumption among residents and attracts visitors, with the possible dire consequence of turning the cultural journalist into an agent of touristic instead of cultural promotion.

Newspaper coverage impact on cultural events: Porto 2001 and Guimarães 2012: European Cultural Capitals

Artigo baseado na comunicação proferida no 1st International Symposium on Media Studies, realizado na Akdeniz Universitesi Yayınları, Antalya, Turquia, 21-23 de novembro de 2013

Avaliação do impacto energético resultante da utilização de repetidores em sistema LTE

Actualmente uma grande preocupação global refere-se ao continuo aumento do custo da energia, resultante da procura e do impacto ambiental. A escalada do custo da energia obriga a procura sistemática de melhores sistemas que permitam diminuir esse custo. Nas comunicações móveis sem fios a economia de energia obtida pelo aumento da eficiência do equipamento das estaçõesbase é insuficiente, pelo qual é necessário também encontrar soluções ao nível da arquitectura. O LTE define os repetidores como um recurso de baixo consumo para aumentar a cobertura e ou capacidade da rede. Nesta dissertação é avaliado um método de economia de energia baseado na substituição de uma estação-base central, circundada por outras estações-base, por um determinado número de repetidores. A cobertura e a capacidade resultante é avaliada assim como a energia poupada. Os resultados obtidos permitem verificar que se pode poupar até 1 000,00 € anuais e 20 kW diários com a substituição de uma estação-base, completamente rodeada por outras estações, por um número de repetidores compreendido entre 1 e 9 dependendo da ISD (até 1750 m). Verifica-se ainda um ganho de eficiência energética de até 13% ao nível do sistema.