Browsing by Issue Date, starting with "2006-09"
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- Comparison of Elemental Carbon (EC) and Black Carbon (BC) measurements derived by Thermo-Optical and filter-based light transmission techniques at North Atlantic.Publication . Barata, Filipe; Fialho, Paulo; Pio, CasimiroTerceira Island (38.691º; 27.354º; 50 m altitude) in the Azores Archipelago, developed to provide a base for remote marine boundary layer measurements at a location near the PICO-NARE (Honrath & Fialho, 2002) (Figure 1). In order to determine a long term carbonaceous component of atmospheric aerosols in North Atlantic, measurements of aerosol BC and EC were begun in 2002. EC and BC define similar fraction of the carbonaceous component of atmospheric aerosols and are supposed to be comparable, but have a delicate different thermal, optical and chemical behaviour in most cases (Lavanchy et al., 1999).
- Tidal height and habitat morphology influences on rock pools algal communities.Publication . Peres, Sara D.; Xavier, Emanuel D.; Neto, Ana I.; Wallenstein, Francisco
- A natureza em Antero de Quental: o projeto de uma «metafísica positiva»Publication . Costa Carvalho, MagdaAo longo da história do pensamento, a ideia de natureza tornou-se permeável a uma intrincada e até ambígua complexidade semântica. Esta é uma tendência que se revela na obra de Antero de Quental (1842-1891) e é nesse sentido que aí encontramos a interpretação da natureza em múltiplas perspectivas, num crescente de densidade especulativa. Poeta por vocação íntima e filósofo por opção convicta, Antero de Quental adoptou em todos os seus escritos a missão de abrir as fronteiras do pensamento. Ainda que não seja alvo de uma análise sistemática por parte de Antero, a ideia de natureza constitui-se como um dos núcleos temáticos essenciais da sua obra. O presente trabalho assume o propósito de reconstituir as diversas acepções e contextos explicativos em que se desenvolve o conceito de natureza no perímetro dos textos do poeta-filósofo açoriano, procurando justificar a existência de uma mundividência filosófica própria subjacente ao corpus anteriano.
- Intertidal rocky shore biotopes of the Azores: a quatitative approach.Publication . Wallenstein, Francisco; Neto, Ana I.Rocky littoral communities of the Azores are dominated by macroalgae where turf formations represent the main life form as on many subtropical and tropical shores. The present study aimed at describing and classifying benthic intertidal biotopes of the Azores using clear quantification and data analysis methodologies to be used in similar studies for spatial and/or temporal comparison. This numerical approach intends to have management and conservation applicability. Thirty study locations along the coast of São Miguel island were characterised by substratum type (cobbles, boulders or bedrock – different stability levels) and exposure to wave action (high, medium or low exposure), from June to August 2002. Algae, sessile and sedentary invertebrates were recorded along transects, and the more conspicuous taxa quantified. Community structure is mainly shaped by substratum stability – unstable cobble communities are separate from those of more stable boulders and bedrock. Boulders present an intermediate community composition between cobbles and bedrock. Exposure to wave action induces smaller variation in community composition. Sixteen biotopes have been recognised. Ultimately the present paper provides an objective set of biotope definition tools for a broad public whose interest focuses on spatial and temporal comparison of coastal communities and associated habitats.
- Fish communities of the Azores in relation to algae based biotopes.Publication . Reis, Rodrigo; Wallenstein, Francisco; Azevedo, José M. N.; Neto, Ana I.; Brum, João M. M.
- The use of digital photography for benthic coastal community characterization and quantification.Publication . Álvaro, Nuno V.; Neto, Ana I.; Wallenstein, Francisco; Ferreira, João G.; Nogueira, Eunice M.; Santos, Catarina I.
- The impact of IFRS in the financial information of the portuguese companiesPublication . Couto, Gualter; Cordeiro, RubenWith the purpose of increasing the efficiency of the European finance market, the European Union forced the classified companies in the share market to publish, from January 1st, 2005 onwards, their consolidated financial statements with the support of the International Financial Reporting Standards (IFRS), emanated of International Accounting Standards Board (IASB). This study intends to measure the impact caused by IFRS application in the financial information of the Portuguese business companies, belonging to the Eurolist by Euronext Lisbon. The results demonstrated that the structure of the consolidated balance sheet and income statement suffered a relevant accounting conversion, conditioning the measure made to the performance and the financial position of the business companies. However, one verified that the accounting variations occurred didn't reveal a pattern, being excessively inconstant. The existence of dependent relationships was verified among the relative percentage verified in some accounting items and the business dimension of the companies. The larger the dimension of the studied companies the bigger the impact of the IFRS application.
- Coastal Biotopes of the Azores: a re-evaluation of the Marine Protected Areas.Publication . Neto, Ana I.; Wallenstein, Francisco; Álvaro, Nuno V.; Silva, Tito; Terra, Marlene R.
- Black Carbon (BC) and Dust mass concentration measures at North Atlantic Free TropospherePublication . Barata, Filipe; Fialho, PauloThe PICO-NARE observatory is an experimental site on the Pico Island (38.470º; 28.404º; 2225 m altitude) in the Azores Archipelago, developed to provide a base for free troposphere measurements (Richard & Fialho, 2002). One Aethalometer (AE31) was used to determine the aerosol seasonal variability for the Central North Atlantic region. Application of the separation technique, proposed by Fialho et al. (2005,2006), aloud the establishment of the seasonal cycles for BC and Dust.
- A predictive model for rocky intertidal biotopes in the Azores.Publication . Wallenstein, Francisco; Álvaro, Nuno V.; Neto, Ana I.