46,030 research outputs found
A single-station method for the detection, classification and location of fin whale calls using ocean-bottom seismic stations
No full textPassive seismic monitoring in the oceans uses long-term deployments of Ocean Bottom Seismometers (OBSs). An OBS usually records the three components of ground motion and pressure, typically at 100Hz. This makes the OBS an ideal tool to investigate fin and blue whales that vocalize at frequencies below 45Hz. Previous applications of OBS data to locate whale calls have relied on single channel analyses that disregard the information that is conveyed by the horizontal seismic channels. Recently, Harris, Matias, Thomas, Harwood, and Geissler [J. Acoust. Soc. Am. 134, 3522-3535 (2013)] presented a method that used all four channels recorded by one OBS to derive the range and azimuth of fin whale calls. In this work, the detection, classification, and ranging of calls using this four-channel method were further investigated, focusing on methods to increase the accuracy of range estimates to direct path arrivals. Corrections to account for the influences of the sound speed in the water layer and the velocity structure in the top strata of the seabed were considered. The single station method discussed here is best implemented when OBSs have been deployed in deep water on top of seabed strata with low P-wave velocity. These conditions maximize the ability to detect and estimate ranges to fin whale calls.Peer reviewe
An introduction to the Geodynamic Evolution of the Southernmost Andes: Connections with the Scotia Arc
No full textThe backbone of this book is the analysis of the relation between the tectonic evolution of the Southernmost Andes and its southern neighbors: Antarctica and the Scotia Sea. The Southernmost Andes comprise the southern bent of the Andean mountains, where they progressively change their strike from the N-S?oriented Southern Patagonian Andes to the E-W?trending Fuegian Andes (Fig. 1). These Andean segments and their corresponding basement, sedimentary basins, magmatic rocks and batholithic belts are linked, even if sometimes elusively, to the evolution of the Antarctic Peninsula and of the islands spread in the southern ocean. The Scotia Sea separating South America and the Antarctic Pe-ninsula (Fig. 1) is only ~30 Myr old, very young, considering a joint geological history of the Southernmost Andes, Patagonia and Antarctica than can be traced back to late Paleozoic times (i.e. 300 Myr or more). Analysis of marine geophysical data in the Scotia Sea (cf. Eagles et al. 2006) and geological data from Tierra del Fuego (Ghiglione et al. 2008) demonstrate that the disconnection of South America and Antarctica started at about 50 Ma. However, oceanic spreading producing the final opening of the Drake Passage, and the consequent strike-slip movements along the North and South Scotia ridges (Fig. 1), occurred just since the Oligocene. Therefore, there is a joint history of Antarctica and South America that was shattered by the opening of the Scotia Sea; the remaining pieces of the puzzle, how can they fit together, and how were they separated from each other are the subjects of this book.Fil: Ghiglione, Matias. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentin
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
Regional Products, Regions' Reputation and Commercial Strategies: A Tale of Two Cheese Suppliers
No full textNetworks of firms producing and selling regional products to domestic and foreign markets are influencing the direction and options of local development. Regional products are embedded in historical tradition and geographic, cultural and social specificity. Most of the local activities are performed by clustered SME's in well defined geographical areas. To study the mechanisms and factors which favour spontaneous development in specific areas and make SME's competitive through cluster development we used case study methodology. An evolutionary perspective of "Casa Matias" and "Casa dos Queijos", two portuguese SME's, is expected to illustrate which key factors triggered the firm's cheese business and, simultaneously, examine organisational practices with particular emphasis on cluster formation and internationalisation process. From this analysis we expected to conceptualise a specific policy scheme to help developing spontaneous entrepreneurship, cooperation between clustered SME's and local collective development.
Os discursos da alfabetização de adultos e as representações do sujeito analfabeto
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Educação.Análise dos discursos da alfabetização de adultos com ênfase no oeste do Paraná. Estuda a constituição do sujeito analfabeto como um saber construído em sua relação com a prática pedagógica a partir do referencial teórico foucaultiano. Constata-se várias imagens sobre o sujeito analfabeto caracterizando-o como incapaz, inculto, alienado, necessitado
Intercultura e sustentabilidade: um estudo de caso centrado nas interrelações com as comunidades de pescadores de Porto Said e Rio Bonito, município de Botucatu (SP)
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências da Educação, Programa de Pós-Graduação em Educação, Florianópolis, 2009O presente trabalho se caracteriza como um estudo de caso nas comunidades de pescadores de Porto Said e Rio Bonito, que vivem às margens de uma represa pertencente à Usina Hidrelétrica- UHE Barra Bonita, no município de Botucatu(SP). O objetivo principal foi analisar, através dos discursos dos pescadores moradores dos acampamentos e de outros moradores da área, bem com de autoridades locais, como eles entendem e enfrentam os principais problemas do entorno da represa e como eles veem o futuro. Um fator marcante para essa nova formação de comunidade decorre da implementação de medidas de compensação ambiental para reservatórios, o que gerou a introdução de espécies exóticas de peixes, particularmente, a tilápia do Nilo. Essa se configurou como uma nova fonte de renda para muitas famílias de baixa renda. Estas famílias de pescadores se instalaram nas margens da represa, sendo área de proteção ambiental e acabaram por estabelecer conflitos de cunho socioambiental o que se constituiu num processo judicial com o poder público e com a empresa concessora da UHE. A metodologia utilizada foi pesquisa qualitativa. Como estratégias de investigação, utilizou-se entrevistas semi-estruturadas, conversas individuais, reuniões, observações e análise documental. A análise dos dados foi mediada por três categorias relacionais, baseadas em Fairclough e Freitas et al: a) relações de identificação ou constituição; b) relações de relações ( relações entre os grupos e com o meio ambiente) e c) relações de controle ou ordem. O que se percebe neste momento é que diferentes discursos e visões vão se estabelecendo: os pescadores querem garantir seu sustento econômico, a empresa quer garantir sua responsabilidade sócio-ambiental junto a organismos internacionais, o estado quer garantir o bem estar social. Enfim, estas diferentes visões vão compondo estratégias de enfrentamento e de sustentação, implicando assim estabelecer normas que irão criar bases para mediar institucionalmente esses conflitos, procurando entender os olhares sobre cada grupo na procura de um futuro mais sustentável
Biblioteca escolar: estudo da satisfação dos alunos da Escola de Educação Básica José Matias Zimmermann
No full textTCC (graduação em Biblioteconomia) - Universidade Federal de Santa Catarina, FlorianópolisApresenta um estudo de satisfação dos usuários da Biblioteca Escolar aos alunos do 8º e 9º ano dos períodos vespertino e noturno da Escola de Educação Básica José Matias Zimmermann. Para o estudo do tema optou-se pela abordagem descritiva e quantitativa e para a obtenção dos dados coletados foi utilizado o questionário com perguntas fechadas. O questionário foi aplicado aos alunos em questão no mês de março de 2010 e os resultados apontam à necessidade de uma melhor divulgação e interação biblioteca-escola
Leucine metabolites do not induce changes in phase angle, bioimpedance vector analysis patterns, and strength in resistance trained men
No full textWe aimed to assess the effects of off-the-shelf leucine metabolite supplements on phase angle (PhA), bioimpedance vector analysis (BIVA) patterns and strength during an 8-week resistance training protocol. Fifty-three male participants were allocated into 4 groups: alpha-hydroxyisocaproic acid (n =12, age = 30.9 +/- 9.3 years), beta-hydroxy-beta-methylbutyrate free acid (n =12, age = 31.0 +/- 9.3 years), calcium beta-hydroxy-beta-methylbutyrate (n =15, age = 32.1 +/- 5.2 years) or placebo (n =14, age = 28.9 +/- 6.6 years). Bioimpedance parameters and 1-repetition maximum (IRM) for back squat and bench press were assessed at baseline and at the end of weeks 4 and 8. Additionally, fat-free mass and fat mass were evaluated by dual-energy X-ray absorptiometry. No statistically group by time interactions were found, even adjusting for age. PhA and vector did not change over the training period, while time-dependent increases were observed for 1RM back squat and 1RM bench press. A direct association was observed between PhA and 1RM bench press changes (whole sample), while PhA and strength were correlated throughout the study, even when adjusting for fat-free mass and percentage of fat mass. Leucine metabolites have no effect on PhA, BIVA patterns or strength during an 8-week resistance training program, in resistance trained subjects.Novelty:Supplementation with leucine metabolites is not a supplementation strategy that improves bioelectrical phase angle, cellular health, and strength after an 8-week resistance training program.When constuning a high protein diet, none of the alpha-hydroxyisocaproic acid, beta-hydroxy-beta-methylbutyrate free acid, and calcium beta-hydroxy-beta-methylbutyrate metabolites resulted in an ergogenic effect in resistance trained men
Fast implementation of iterative adaptive approach for wideband unambiguous radar detection
No full textAccepted author manuscriptMicrowave Sensing, Signals & System
The importance of chain conformational mobility during 5-exo-cyclizations of C-, N- and O-centred radicals
No full textThe author thanks the EPSRC (grant EP/I003479/1) and EaStCHEM for funding.The reaction coordinates of an archetypical set of 5-exo cyclizations of C-, N- and O-centred radicals were investigated by computational methods. G4 theory, and DFT with the um062x functional, were able to rationalise counterintuitive factors such as the 'normal' order of rate constants being: N-centredPeer reviewe
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