Browsing by Issue Date, starting with "2016-09-27"
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- Evolução do setor da resinagem em PortugalPublication . Duarte, Célio Alexandre Marques; Fidalgo, Maria Beatriz MachadoRESUMO A síntese de resina é o principal mecanismo de defesa dos pinheiros contra ataques. Esta é no entanto aproveitada pelo homem, desde os tempos mais antigos, para diferentes fins. Em Portugal, a indústria dos resinosos, encontrou condições muito favoráveis ao seu desenvolvimento. As políticas florestais, em diferentes períodos, associada às caraterísticas de produção de resina do pinheiro bravo, fizeram com que Portugal tivesse sido já o maior produtor mundial. Após um período de decaimento, devido à ascensão de outros países que provocaram uma redução acentuada no preço da matéria-prima, a atividade parece agora despertar a atenção dos proprietários e operadores da resina. Entretanto novos problemas e receios surgiram no seio dos intervenientes. O presente trabalho traça uma perspetiva histórica do que foi a resinagem em Portugal, efetuando a caraterização atual do setor. Na consulta realizada aos proprietários e operadores de resina, é efetuada uma análise SWOT ao setor, onde são identificados não só as forças e oportunidades do setor, mas também os fatores que condicionam, ou poderão vir a condicionar a atividade. Na conjugação da análise SWOT com a avaliação de preferências, os proprietários e operadores de resina definiram os fatores que mais poderão condicionar o futuro da atividade. PALAVRAS-CHAVE: Resina; Goma; Pinheiro bravo; Proprietários; Resineiros; Industria ABSTRACT The pine pitch synthesis is the major pine’s defence mechanism against external attacks. From ancient times pitch it has being used by mankind, for different purposes. At Portugal, the naval stores found favourable conditions for its development. Favourable forest politicies, throughout different periods, combined with favourable conditions for pitch production from maritime pine, allowed Portugal to become one of the worldwide top producers. Prices reduction, caused by high market availability, as a consequence of the rising production on other countries, led to the national production decline. Recently, national pitch production, once again, seems to have grabbed the forest owners and pitch industry stakeholders attention, nevertheless further developments are still being hold on by some doubts, fears and the identification of new problems. This work comprises not only an historical overview of this sector at Portugal but characterizes as well the sector present situation. Thought out a query, made to pitch owners and operators, In consultation with the owners and operators of resin, is effected a SWOT analysis at sector, which are identified the strengths, opportunities and factors that affect, or are likely to condition the activity. In conjunction with the SWOT analysis evaluation preferences, owners and operators resin defined the factors that may influence the future of the activity. KEY-WORDS: Pitch; Gum resin; Maritime pine; Proprietary; Resin operator, Naval stores
- The effect of hydrophilic monomers on silicone-based hydrogels propertiesPublication . Carrilho, Magda; Silva, Diana; Saramago, Benilde; Serro, Ana Paula
- The performance of the jet trigger for the ATLAS detector during 2011 data takingPublication . ATLAS collaboration (2861 authors); Aguilar-Saavedra, Juan Antonio; Amor Dos Santos, Susana Patricia; Anjos, Nuno; Araque, Juan Pedro; Cantrill, Robert; Carvalho, João; Castro, Nuno Filipe; Conde Muiño, Patricia; Da Cunha Sargedas De Sousa, Mario Jose; Fiolhais, Miguel; Galhardo, Bruno; Gomes, Agostinho; Gonçalo, Ricardo; Jorge, Pedro; Lopes, Lourenco; Machado Miguens, Joana; Maio, Amélia; Maneira, José; Oleiro Seabra, Luis Filipe; Onofre, António; Palma, Alberto; Pedro, Rute; Pina, João Antonio; Santos, Helena; Saraiva, João; Silva, José; Tavares Delgado, Ademar; Veloso, Filipe; Wolters, HelmutThe performance of the jet trigger for the ATLAS detector at the LHC during the 2011 data taking period is described. During 2011 the LHC provided proton–proton collisions with a centre-of-mass energy of 7 TeV and heavy ion collisions with a 2.76 TeV per nucleon–nucleon collision energy. The ATLAS trigger is a three level system designed to reduce the rate of events from the 40 MHz nominal maximum bunch crossing rate to the approximate 400 Hz which can be written to offline storage. The ATLAS jet trigger is the primary means for the online selection of events containing jets. Events are accepted by the trigger if they contain one or more jets above some transverse energy threshold. During 2011 data taking the jet trigger was fully efficient for jets with transverse energy above 25 GeV for triggers seeded randomly at Level 1. For triggers which require a jet to be identified at each of the three trigger levels, full efficiency is reached for offline jets with transverse energy above 60 GeV. Jets reconstructed in the final trigger level and corresponding to offline jets with transverse energy greater than 60 GeV, are reconstructed with a resolution in transverse energy with respect to offline jets, of better than 4 % in the central region and better than 2.5 % in the forward direction.