Últimos itens adicionados do Acervo: Laboratório Nacional de Energia e Geologia

O Laboratório Nacional de Energia e Geologia (LNEG) é uma instituição de I&D orientada para responder às necessidades da sociedade e das empresas. Apostando numa investigação sustentável e para a sustentabilidade através da geração do conhecimento em Portugal.

Página 6 dos resultados de 2312 itens digitais encontrados em 0.003 segundos

‣ Equinodermes do Cabeço da Ladeira : um caso de preservação do património geológico

Pereira, Bruno Claro; Machado, Susana; Carvalho, Jorge M. F.; Mergulhão, Lia; Pereira, Pedro; Duarte, Manuel; Anacleto, José António
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em /07/2014 Português
O presente trabalho pretende descrever o processo de intervenção no geossítio Equinodermes do Cabeço da Ladeira, concelho de Porto de Mós. Este local foi assim classificado por conter fósseis de equinodermes detentores de importância científica significativa, merecendo especial atenção e medidas de preservação. Expõem-se os passos tomados desde a sua identificação até às ações mais recentes, que envolveram a inventariação dos exemplares fósseis. O futuro do local é também abordado, pretendendo-se que passe pela requalificação do local como espaço de visitação musealizado.

‣ New photographic evidence on the 1954 excavations at Moita do Sebastião, Muge, Portugal

Jackes, Mary; Alvim, Pedro; Anacleto, José António; Roksandic, Mirjana
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Parte de Livro
Publicado em //2014 Português

‣ Os TRL (Technology Readiness Levels) como ferramenta na avaliação tecnológica

Gil, Luís; Andrade, Maria Hermínia; Costa, Maria do Céu
Fonte: Ordem dos Engenheiros Publicador: Ordem dos Engenheiros
Tipo: Artigo de Revista Científica
Publicado em //2014 Português
Descreve-se uma ferramenta de avaliação tecnológica designada por Níveis de Prontidão Tecnológica (do inglês, Technology Readiness Levels - TRL), apresentando o início da sua aplicação, pela NASA, e adaptando-a a uma nova tecnologia, na área dos materiais, desenvolvida num Laboratório Nacional, que funciona como caso de estudo e exemplo de aplicação.

‣ O risco no domínio dos materiais

Gil, Luís
Fonte: Ordem dos Engenheiros Publicador: Ordem dos Engenheiros
Tipo: Artigo de Revista Científica
Publicado em //2014 Português
Uma definição de risco é a probabilidade de acontecer uma situação adversa, problema ou dano e as consequências deste mesmo. Avaliar os riscos e determinar a melhor forma de gestão constitui um enorme desafio, pois é difícil avaliar todos os aspectos do risco e determinar todas as consequências de uma medida de controlo, dado que é muito elevado o grau de incerteza. No âmbito da Engenharia, a área dos materiais é uma das mais relacionadas com o risco tecnológico, dado que a degradação ou corrosão destes pode conduzir à sua fadiga e fratura/rotura. 

‣ The construction of a new technological innovation system in a follower country: wind energy in Portugal

Bento, Nuno; Fontes, Margarida
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 Português
This article analyzes the process of construction of a new innovation system based on wind energy in a "follower" context. The technological innovation systems framework is used to analyze and explain the emergence of a new wind industry in Portugal, where this renewable energy technology knew a spectacular development in the past decade. This framework highlights the main processes or functions that intervene in the diffusion of a new technology. The evidence obtained demonstrates that the fulfillment of these functions, which were mostly studied in the context of pioneer countries, is still pertinent to explain the formation of a wind energy system in this follower country. Yet the type of resources and the nature of the activities needed to adopt the technology in the latter will often differ. This case provides new insights about the importance of functions that enhance the follower's capacity to assimilate the new technology (e.g. local knowledge development, experimentation), creating conditions for a fast move as soon as innovations become sufficiently mature in the core.

‣ Entry by research-based spin-offs

Conceição, Oscarina; Faria, Ana Paula; Fontes, Margarida
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 Português
Reflecting the increasing number of research based spin-offs (RBSOs) created since the nineties, previous studies focus their analysis on the factors that influence university entrepreneurship. However, empirical studies that investigate the determinants of variation on RBSO creation across regions are scarce. Using a unique self-collected dataset that comprehends the population of RBSOs created in Portugal from 1995 until to 2007 we investigate the intensity of spin-offs entry across regions, by focusing on the characteristics of the universities and the region in which the spin-off is located. Our results suggest that the quality and prestige of the universities located in a municipality, as well as the presence of university-affiliated incubators and/or university research parks have a positive impact on the intensity of RBSO creation. Regarding the regional characteristics, the availability of qualified human capital and the urbanization economies seem to exert an important effect on spin-off activity across regions.

‣ Pb enrichments in short sediment cores collected off the Portuguese Margin

Costa, Ana Novo; Mil-Homens, Mário; Lebreiro, Susana; Trancoso, Maria Ascensão; Melo, Zenaida; Mouro, Filomena; De Stigter, Henko; Boer, Win; Richter, Thomas; Van Weering, Tjeerd C. E.; Abrantes, Fátima
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em /09/2008 Português

‣ Baseline contents of Cr, Ni, Pb and Zn in the portuguese shelf sediments

Mil-Homens, Mário; Stevens, R. L.; Cato, I.; Abrantes, Fátima
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em /09/2008 Português

‣ Garnet-biotite diffusion mechanisms in complex high-grade orogenic belts : understanding and constraining petrological cooling rates in granulites from Ribeira Fold Belt (SE Brazil)

Bento dos Santos, Telmo; Tassinari, Colombo C. G.; Fonseca, Paulo E.
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Artigo de Revista Científica
Publicado em /12/2014 Português
Cooling rates based on the retrograde diffusion of Fe2+ and Mg between garnet and biotite inclusions commonly show two contrasting scenarios: a) narrow closure temperature range with apparent absence of retrograde diffusion; or b) high result dispersion due to compositional variations in garnet and biotite. Cooling rates from migmatites, felsic and mafic granulites from Ribeira Fold Belt (SE Brazil) also show these two scenarios. Although the former can be explained by very fast cooling, the latter is often the result of open-system behaviour caused by deformation. Retrogressive cooling during the exhumation of granulite-facies rocks is often processed by thrusting and shearing which may cause plastic deformation, fractures and cracks in the garnet megablasts, allowing chemical diffusion outside the garnet megablast – biotite inclusion system. However, a careful use of garnets and biotites with large Fe/Mg variation and software that reduces result dispersion provides a good correlation between closure temperatures and the size of biotite inclusions which are mostly due to diffusion and compositional readjustment to thermal evolution during retrogression. Results show that felsic and mafic granulites have low cooling rates (1–2 °C/Ma) at higher temperatures and high cooling rates (~100 °C/Ma) at lower temperatures...

‣ Evolução geodinâmica do Complexo Anatéctico de Figueira de Castelo Rodrigo-Lumbrales

Pereira, I.; Bento dos Santos, Telmo; Dias, Rui; Mata, João
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em /10/2014 Português

‣ A process view of new ventures internationalization: capabilities, alertness and the moderating role of technological turbulence

Crespo, Nuno F.; Simões, Vitor Corado; Fontes, Margarida
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 Português
This research is based on the perception that the explanation of International New Ventures’ (INVs) performance demands a process view, going deeper than the standard approach, in empirical papers, of testing a direct relationship between individual- and company-level antecedents, and performance. In line with Aspelund, Madsen & Moen (2007) and Keupp & Gassmann (2009) arguments, a three-tier model was developed to investigate the process leading to INVs international performance. Based on the dynamic capabilities framework, entrepreneurial alertness was envisaged as the mediating element between firms’capabilities and their international performance. Empirical research confirmed the hypothesized model. Firms’capabilities (entrepreneurial orientation, foreign market knowledge, and absorptive capacity) significantly influence the level of entrepreneurial alertness, which impacts on company international performance. The paper makes three contributions to International Entrepreneurship literature. First, it highlights the key role played by entrepreneurial alertness in explaining INVs’ international performance. This is convergent with the dynamic capabilities view on firms’ ability to sense and seize specific international business opportunities. Second...

‣ The multi-spatial dynamics of niche trajectory: the case of the wave energy technological niche

Fontes, Margarida; Ferreira, J.; Sousa, Cristina
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 Português
This paper investigates the role played by processes taking place at different spatial levels in the construction and development of technological niches. It is proposed that niches, as protective spaces where technologies are developed and articulated with societal needs, may transcend territorial boundaries, encompassing communities and actions that span several spatial levels, without losing some local embeddedness. The paper draws on the multi-level perspective and on recent additions to the strategic niche management framework, to support an exploratory case study of the highly internationalised wave energy niche. The objective is to investigate the implications, for the conduction of niche internal processes and for niche regime interactions, of the increased complexity introduced by this multi-spatial dynamics. The case study addresses the formation, development and (transitory?) decline of the wave niche in Portugal, that was among the pioneers in the field and whose core actors have consistently been engaged in activities conducted at transnational and supra-national levels. The analysis confirms that niche development is shaped as much by local/national processes as by processes taking place at a diversity of spatial levels...

‣ Dynamics of knowledge production and technology diffusion: insights from the emergence of wind energy

Sousa, Cristina; Bento, Nuno; Fontes, Margarida
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 Português
The objective of this paper is to contribute to a better understanding of the relation between the dynamics of knowledge production and technology diffusion along the process of emergence of a new technology, as it unfolds in diverse spatial locations. For this purpose, the paper traces the process of knowledge production over time expressed in the number of scientific publications and assesses how its dynamics relate with those of technology up scaling and diffusion, for the case of a new renewable energy technology: wind power. It also compares these processes in different spatial areas, looking at similarities and differences in the evolving patterns in initial markets and follower regions. In order to trace the dynamics of knowledge production we conduct a bibliometric analysis, using data collected from the Thomson Reuters Web of Science database (for the period 1970-- 2012). In order to trace the diffusion dynamics we use data collected on both unit scale of turbines and installed capacity of wind power (starting in late 1970s), following the empirical scaling methodology. These analyses are conducted at global scale and, subsequently, at a regional scale, for a pioneer (Denmark) and a fast follower (Portugal). The comparison of the outcomes from the bibliometric and the technology growth analyses permits to understand the rhythm and order in which knowledge was created and applied in this particular innovation. It also provides a preliminary account of the interplay between pioneer and fast follower regions.

‣ Dynamics of knowledge production and technology diffusion: Insights from the emergence of wind energy

Sousa, Cristina; Bento, Nuno; Fontes, Margarida
Fonte: DINÂMIA’CET – IUL Publicador: DINÂMIA’CET – IUL
Tipo: Trabalho em Andamento
Publicado em //2014 Português
The objective of this paper is to contribute to a better understanding of the relation between the dynamics of knowledge production and technology diffusion along the process of emergence of a new technology, as it unfolds in diverse spatial locations. For this purpose, the paper traces the process of knowledge production over time – expressed in the number of scientific publications - and assesses how its dynamics relate with those of technology up-scaling and diffusion, for the case of a new renewable energy technology: wind power. It also compares these processes in different spatial areas, looking at similarities and differences in the evolving patterns, in initial markets and follower regions. In order to trace the dynamics of knowledge production we conduct a bibliometric analysis, using data collected from the Thomson Reuters Web of Science database (for the period 1970-2012). In order to trace the diffusion dynamics we use data collected on both unit scale of turbines and installed capacity of wind power (starting in late 1970s), following the empirical scaling methodology. These analyses are conducted at global scale and, subsequently, at a regional scale, for a pioneer (Denmark) and a fast follower (Portugal). The comparison of the outcomes from the bibliometric and the technology growth analyses permits to understand the rhythm and order in which knowledge was created and applied in this particular innovation. It also provides a preliminary account of the interplay between pioneer and fast follower regions.

‣ Location of research-based spin-offs: how relevant are regional effects?

Conceição, Oscarina; Faria, Ana Paula; Fontes, Margarida
Fonte: Universidade do Minho. Núcleo de Investigação em Políticas Económicas (NIPE) Publicador: Universidade do Minho. Núcleo de Investigação em Políticas Económicas (NIPE)
Tipo: Trabalho em Andamento
Publicado em //2014 Português
Using a unique self-collected dataset that comprehends the population of research-based spin-offs created in Portugal from 1995 until to 2007, we investigate the location choices of these firms. In order to do so we control for both university- and region-related mechanisms. Our results suggest that the latter play a lesser role than university-related mechanisms. Although the availability of qualified human capital and urbanization economies seem to exert some effect on the location choices of research-based spin-offs, our results suggest that the quality and prestige of the universities located in a region, as well as the presence of university-affiliated incubators and/or university research parks have a stronger impact on the intensity of RBSO location across regions.

‣ Phenolic waste valorization through bioenergy and bioactive compounds production [Resumo]

Marques, Isabel Paula Ramos; Morana, A.; La Cara, F.
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 Português
The agricultural and industrial processing activities produce large amounts of waste that are only partially valorised at different value-added levels (spread on land, animal feed, composting), whereas the main volumes are managed as waste of environmental worry. These by-products are rich sources of bioactive compounds, including phenolic compounds with high antioxidant activity.

‣ Vegetable wastes to phenolic compounds by anaerobic digestion [Poster]

La Cara, F.; Ionata, E.; Del Monaco, G.; Marques, Isabel Paula Ramos
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 Português
The present work intends to assess whether anaerobic digestion could be additionally used as a valorisation method of fresh-cut fruit and vegetables by-products, producing different valuable molecules for industrial applications.

‣ Scenedesmus obliquus: biogas production from residues of biodiesel/bioethanol extraction processes [Resumo]

Batista, Ana Paula; Gouveia, L.; Marques, Isabel Paula Ramos
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 Português
The aim of the present study was to evaluate the digestibility and the potential of biomethane production of Scenedesmus obliquus microalga, considering different biomass substrates.

‣ Digestor anaeróbio híbrido e a valorização da água ruça [Comunicação oral]

Marques, Isabel Paula Ramos
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em //2014 Português
Workshop do Projecto MEDOLICO: Tratamento e Valorização de Resíduos e Subprodutos de Lagares de Azeite

‣ 3D facies architecture and dynamics of a beach barrier-lagoon complex (Ría de Vigo, Galicia, Spain)

Clemente, F.; Pérez-Arlucea, Marta; Alejo, Irene; Nombela, Miguel Ángel; González, D.; Costas, Susana; Bernárdez, Patricia; González, R.; González Villanueva, Rita
Fonte: Laboratório Nacional de Energia e Geologia Publicador: Laboratório Nacional de Energia e Geologia
Tipo: Conferência ou Objeto de Conferência
Publicado em /07/2005 Português