Browsing by Issue Date, starting with "2000"
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- A comunicação dirigida e os meios de comunicaçãoPublication . Moutinho, Ana Viale; noNos dias de hoje, Ă© cada vez mais importante a personalização dos serviços, ou pelo menos dar a entender que Ă© precisamente Ă quela pessoa que nos estamos a dirigir. A comunicação dirigida, tal como a entendemos hoje, Ă© importante para estabelecer e manter boas relaçÔes com os pĂșblicos das empresas e das instituiçÔes. Assim, a comunicação deve ser interactiva, uma palavra que estĂĄ na moda e que quer dizer trocar informaçÔes, fazer feedback, evitando, de uma forma cada vez mais constante e efectiva, os boatos e as barreiras Ă comunicação. Etimologicamente, a palavra comunicação evoluiu do verbo latino comunicare (comunicar), que significa tornar comum bens materiais, espirituais ou afectivos, como se fosse uma partilha. Mais tarde o conceito evoluiu para a acção ou atitude de entrar em relação com alguĂ©m, realçando os laços entre os indivĂduos atravĂ©s da palavra. Nos dias de hoje, comunicar deixou de se limitar Ă palavra, passando para o gesto, para o corpo, para o sinal, para tĂ©cnicas como a publicidade, as relaçÔes pĂșblicas ou mesmo as estradas (quando se fala em vias de comunicação). Actualmente, a palavra estĂĄ tĂŁo banalizada que qualquer coisa que façamos para transmitir uma passagem do individual ao colectivo Ă© comunicar.
- Role of subaerial volcanic rocks and mantle plumes in creation of South Atlantic margins: implications for salt tectonics and source rocksPublication . Jackson, M. P. A.; Cramez, Carlos; Fonck, Jean-MichelSeaward-dipping reĂÂŻectors (SDRs) represent ĂÂŻood basalts rapidly extruded during either rifting or initially subaerial sea-ĂÂŻoor spreading. Evaporites can form on this basaltic proto-oceanic crust, as in the Afar Triangle today. Evidence for SDRs in South Atlantic deep-water regions comes from proximity to the uniquely large Paranaà ñEtendeka volcanic province onshore, the Tristan and Gough hot spots, drilled volcanic rocks, and seismic proĂÂźles showing SDR provinces more than 100 km wide, as much as 7 km thick, and thousands of kilometers long. SDRs are clearest adjoining the Aptian salt basins. However, we speculate that SDRs are also present but seismically obscured below the salt basins. We argue that the conjugate Aptian salt basins are post-breakup, not pre-breakup; they were separated from the start by a mid-oceanic ridge; distal salt accumulated on proto-oceanic crust, not rift basins. This hypothesis is supported by: seismic stratigraphy and structure; magnetic anomalies; plate reconstructions; and hydrothermal potash evaporites. An important implication for exploration is that thick basalts, rather than rift-age source rocks, may underlie distal parts of the salt basins.
- Impact of road traffic emissions on air quality of the Lisbon regionPublication . Borrego, C.; Tchepel, O.; Barros, Nelson; Miranda, A.I.The main purpose of this paper is to present the study of traffic emissions impact on the Lisbon region air quality. Two approaches of emission data generation with high spatial and temporal resolution are presented and compared. Main roads were processed as line sources and hot on-road emissions were calculated based on daily mean traffic and emission factors distinguished for several road classes and vehicle types. Also, the disaggregation of national CORINAIR inventory has been performed on the basis of statistical information of fuel consumption and population density. The comparison of emission data obtained by these two approaches demonstrates a good agreement for total values, but a significant difference for spatial distribution of the data. To ensure completeness of the data, to improve their spatial resolution and also to analyse the impact of the traffic emissions, a combination of the two approaches was applied to generate the emission data used by a photochemical numerical system to simulate the atmospheric circulation and the air pollution pattern in Lisbon under summer meteorological conditions, having different emission scenarios. It was possible to conclude that an air pollution abatement strategy is urgently needed and it should take into account the strong contribution of road traffic emissions to the Lisbon air pollution levels.
- Apego Ă famĂlia, grupo de pares e condutas anti-sociais na adolescĂȘncia: um estudo exploratĂłrio realizado na Escola SecundĂĄria AntĂłnio Nobre em Vila Nova de GaiaPublication . Curto, Paulo Jorge de Jesus; Martins, JosĂ© SoaresApoiado nas teorias dos processos de socialização, o presente trabalho estuda a influĂȘncia dos contextos de socialização, famĂlia e pares, na gĂ©nese das condutas anti-sociais dos adolescentes.( Usando uma amostra de 100 indivĂduos. Verificou-se que os pressupostos da Teoria do Controlo Social de Hirschi e da Teoria da Associação Diferencial de Sutherland foram, no essencial, comprovados pelos resultados deste estudo. No entanto, as correlaçÔes observadas indicam que, de facto, o grupo de pares Ă© a principal fonte de influĂȘncia no comportamento (delinquente) dos jovens. Enquanto, o apego Ă famĂlia revela fracas correlaçÔes com as condutas anti-sociais dos jovens observados. Mesmo assim, apesar dos resultados obtidos apontarem o grupo de pares (associação a pares desviados) como o preditor mais poderoso da delinquĂȘncia individual, os mesmos resultados sugerem que o apego Ă famĂlia pode ser um factor importante na sua determinação.
- Importance of handling organic atmospheric pollutants for assessing air qualityPublication . Borrego, C.; Gomes, P.; Barros, Nelson; Miranda, A.I.Volatile organic compounds (VOCs) are the main precursors of tropospheric ozone production, playing an important role in photochemical pollution of the atmosphere and, consequently, in the degradation of air quality. Air quality photochemical models require a specific VOC profile for each different main source, based on the most important group compounds. Chromatographic techniques have been used to identify and measure VOC in Portugal. These measured values were used to simulate photochemical pollution, and modelling results were compared with those from another simulation using VOC class distributions from the literature. Ozone concentration values estimated via both simulations indicate the importance of using VOC data from Portugal instead of those obtained in different conditions.
- A origem da obra de publicidadePublication . Moutinho, Ana ClĂĄudia Rebolho Viale; Tunhas, Paulo
- Abordagem ambiental na empresa: perspectivas de gestĂŁo e contabilidadePublication . Silva, Carla Alexandra Faria; GuimarĂŁes, Raul
- Phenolic acids and derivatives: studies on the relationship among structure, radical scavenging activity, and physicochemical parametersPublication . Silva, Francisco A. M.; Borges, Fernanda; Guimarães, Carla; Lima, José L. F. C.; Matos, Carla; Reis, SaletteThe antiradical activity of caffeic acid (1), dihydrocaffeic acid (5), and their corresponding n-alkyl esters was evaluated by using the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH(*)) method. Dihydrocaffeic acid (5) was the most potent compound, having an antiradical effect higher than that of (+/-)-alpha-tocopherol, whereas caffeic acid (1) was less efficient. Esterification of the carboxyl group of dihydrocaffeic acid (5) had a dramatic effect on its antiradical potency, but similar effects were not observed for caffeic acid (1) derivatives. The n-alkyl esters of both phenolic series had similar potencies, and their antiradical activities were independent of the alkyl chain length. Dose-dependent scavenger effects were found in both series. Acid-base properties of the compounds, evaluated by using potentiometry and spectrophotometry, showed that the catechol moiety had pK(a2) and pK(a3) values of 9. 24-9.02 and 11.38-10.99 in the dihydrocaffeic series and 8.48-8.24 and 11.38-11.07 in the caffeic series, respectively. Antiradical activity and pK(a) values of the compounds were not related.
- ViolĂȘncia e suporte familiar, auto-conceito e delinquĂȘncia na adolescĂȘncia: estudo exploratĂłrio numa amostra de adolescentes do ensino secundĂĄrioPublication . Cruz, Ana Sofia Matias Rodrigues da; Martins, JosĂ© SoaresCom o presente estudo procurou-se determinar as relaçÔes existentes entre a violĂȘncia e o suporte familiar, o auto-conceito e a delinquĂȘncia na adolescĂȘncia. Para tal foram utilizados trĂȘs instrumentos: o InventĂĄrio ClĂnico de Auto-Conceito (ICAC), de Adriano Vaz Serra, o QuestionĂĄrio de Condutas Anti-Sociais de Lourdes MirĂłn e trĂȘs sub-escalas do «Exposure to Abusive and Supportive Environments Parenting Inventory» (EASE-PI), de Karen Nicholas e Stephen Bieber. Os questionĂĄrios foram aplicados a uma amostra composta por alunos do 9Âș ano, 10Âș, 11Âș e 12Âș anos da Escola SecundĂĄria Filipa de Vilhena. Constituem-se como palavras-chave para este estudo auto-conceito, abuso emocional, abuso fĂsico, suporte familiar e comportamento anti-social. Dos resultados desta investigação conclui-se a existĂȘncia de correlaçÔes significativas entre os comportamentos sociais, a violĂȘncia e o suporte familiar e algumas das dime4nsĂ”es do auto-conceito.
- Analysis of the deep chlorophyll maximum across the Azores FrontPublication . Macedo, M.F.; Duarte, Pedro; Ferreira, JoĂŁo; Alves, M.; Costa, V.Physical, chemical and biological observations made in late July and August 1997 across the Azores Front (37ÂșN, 32ÂșW to 32ÂșN, 29ÂșW) are presented. The objectives of the study were: (1) to analyse horizontal and vertical profiles of temperature, salinity, density, nutrients and chlorophyll-a (Chl a) of the top 350 m; (2) to identify the main differences in the deep Chl a Maximum (DCM) and hydrographic structure between the water masses that pass north and south of the Azores Front; and (3) to estimate phytoplankton primary production in these water masses. Horizontal and vertical profiles of salinity, temperature, density, nutrients and phytoplankton pigments in the top 350 m were analysed. The Front separates two distinct water types: the 18 ÂșC ModeWater (18MW) of subtropical origin, and the 15 ÂșC ModeWater (15MW) of sub-polar origin. Differences in the DCM and hydrographic structure between 18 MW and 15 MW were observed in the contour plots of each section. The average Chl a concentration between 5 and 200 m depth decreased significantly from 15 MW to 18 MW. The same pattern was observed for the Chl a concentration at the DCM depth. A vertical one-dimensional model was used to estimate the phytoplankton primary production in the 15 MW and 18 MW and led to an estimated water column average gross primary productivity (GPP) between 1.08 and 2.71 mg C m