A lousa digital: reflexões sobre suas possibilidades de uso para a promoção do ensino no município de Fraiburgo

TCC(especialização) - Universidade Federal de Santa Catarina. Centro de Ciências da Educação. Departamento de Metodologia de Ensino. Educação na Cultura Digital.Este trabalho busca refletir como as Tecnologias Digitais de Informação e Comunicação, em especial a lousa digital, são utilizadas durante o planejamento dos professores da rede Municipal de Educação na cidade de Fraiburgo, em Santa Catarina. O trabalho teve como base a pesquisa bibliográfica e coleta de dados através de formulário online, tendo como público-alvo: professores da rede municipal de Fraiburgo. Como ponto de partida, adota-se a apreciação dos recursos disponíveis no ambiente escolar, além da análise acerca dos desafios encontrados pelos professores durante o planejamento e execução das aulas, principalmente no que se refere ao uso da lousa digital, propondo um apontamento para a importância da formação continuada de professores

Sensitivity analysis of school parameters to compare schools from different surveys: a review of the standardisation task of the EC-FAIR programme CLUSTER

Echo traces seen on echo grams contain a lot of information about the aggregation of fish in schools. But the acosutic image obtained with a vertical biomass assessment echosounder contains distorsions mainly due to the beam angle, the equipment settings and the school depth. When the acoustic image of aggregation patterns changes over the years or varies between stocks, it is important to know up to what extent biological interpretation is meaningful!. The present paper reviews the work performed by a group of scientist within the EC FAIR programme CLUSTER. Simulations were performed to correct school parameters. Digital data were replayed to assess the importance of these corrections. Charts were derived to limit biological interpretation of changes on the school acoustic images

Multidisciplinary investigation on cold seeps with vigorous gas emissions in the Sea of Marmara (MarsiteCruise): Strategy for site detection and sampling and first scientific outcome

MarsiteCruise was undertaken in October/November 2014 in the Sea of Marmara to gain detailed insight into the fate of fluids migrating within the sedimentary column and partially released into the water column. The overall objective of the project was to achieve a more global understanding of cold-seep dynamics in the context of a major active strike-slip fault. Five remotely operated vehicle (ROV) dives were performed at selected areas along the North Anatolian Fault and inherited faults. To efficiently detect, select and sample the gas seeps, we applied an original procedure. It combines sequentially (1) the acquisition of ship-borne multibeam acoustic data from the water column prior to each dive to detect gas emission sites and to design the tracks of the ROV dives, (2) in situ and real-time Raman spectroscopy analysis of the gas stream, and (3) onboard determination of molecular and isotopic compositions of the collected gas bubbles. The in situ Raman spectroscopy was used as a decision-making tool to evaluate the need for continuing with the sampling of gases from the discovered seep, or to move to another one. Push cores were gathered to study buried carbonates and pore waters at the surficial sediment, while CTD-Rosette allowed collecting samples to measure dissolved-methane concentration within the water column followed by a comparison with measurements from samples collected with the submersible Nautile during the Marnaut cruise in 2007. Overall, the visited sites were characterized by a wide diversity of seeps. CO2- and oil-rich seeps were found at the westernmost part of the sea in the Tekirdag Basin, while amphipods, anemones and coral populated the sites visited at the easternmost part in the Cinarcik Basin. Methane-derived authigenic carbonates and bacterial mats were widespread on the seafloor at all sites with variable size and distributions. The measured methane concentrations in the water column were up to 377 μmol, and the dissolved pore-water profiles indicated the occurrence of sulfate depleting processes accompanied with carbonate precipitation. The pore-water profiles display evidence of biogeochemical transformations leading to the fast depletion of seawater sulfate within the first 25-cm depth of the sediment. These results show that the North Anatolian Fault and inherited faults are important migration paths for fluids for which a significant part is discharged into the water column, contributing to the increase of methane concentration at the bottom seawater and favoring the development of specific ecosystems

Perspectives de l'acoustique pêche : conclusions du symposium d’Aberdeen

Ce rapport est composé de deux parties. La première présente une synthèse sur l'utilisation actuelle et prospective de l'acoustique, soulignant les tendances et les besoins technologiques pour faire de l'acoustique un moyen privilégié d'observation des écosystèmes. La participation de la recherche française dans le domaine y sera analysée avec une attention particulière. La deuxième présente un résumé et les points marquants du Symposium International sur les Méthodes Acoustiques Appliquées à l'Etude des Organismes Aquatiques (International Symposium on Fisheries and Plankton Acoustics), organisé à Aberdeen en juin 1995

Boundaryless careers and discontinuous trajectories: a descriptive study on opt-out decisions

Diversos pesquisadores têm sinalizado que o impacto da globalização e das modernas tecnologias da informação e comunicação transformou a noção de como o trabalho é desenvolvido nas organizações. No atual contexto, antigas promessas de estabilidade de emprego não conseguem mais ser sustentadas, fazendo-se necessário repensar os paradigmas de desenvolvimento profissional. Frente a este cenário, surge uma abordagem denominada carreiras sem fronteiras, onde os indivíduos transitam mais livremente entre diversas organizações, desatrelam suas identidades de empregadores específicos e incorporam outras dimensões da vida humana, além da profissional, como elementos vitais à sua realização pessoal. Além disso, o novo paradigma comporta de forma mais natural interrupções temporárias de carreira, entendendo-as como parte da evolução profissional e de vida do indivíduo. Neste sentido, pesquisadores americanos têm crescentemente investigado um movimento denominado \"revolução opt-out\", descrevendo indivíduos altamente qualificados e com alto desempenho que, em busca de maior realização pessoal, voluntariamente tomam alguma decisão de carreira que vai de encontro às tradicionais premissas de evolução profissional. Alguns modelos explicativos têm sido elaborados buscando compreender as motivações de tais profissionais, dentre os quais o modelo ABC de carreiras caleidoscópio utilizado neste trabalho. Embora muito se discuta sobre o cenário acima no exterior, não existem estudos científicos investigando se o movimento opt-out ocorre no país, e se ocorre, quais as suas características e qual o perfil dos profissionais que o adotam, sendo este, portanto, o objeto de pesquisa deste trabalho. Para examinar tais questões, realizou-se um censo quantitativo e descritivo de 248 ex-alunos de graduação e pós-graduação da Faculdade de Economia, Administração e Contabilidade da Universidade de São Paulo (FEA USP), que estiveram presentes em encontro de ex-alunos realizado em 10 de novembro de 2007. Os dados coletados foram analisados por meio de estatística descritiva e estatística inferencial (testes qui-quadrado, t de Student, análise de variância, análise de correspondência e análise fatorial). Os resultados obtidos levaram à aceitação das quatro hipóteses propostas para o trabalho, indicando que uma parcela significativa dos respondentes já fez movimentos opt-out ao longo da carreira, e foram comprovadas vinculações significativas entre o perfil dos respondentes e a realização de opt-out; entre o perfil dos respondentes e os motivos apontados para a decisão; e entre os tipos de movimento opt-out e as razões subjacentes à decisão.Several researchers have indicated that the impact of globalization and modern information and communication technologies transformed the notion of how work is done in the organizations. In the present context, previous promises of job stability can no longer be sustained, resulting in the need to rethink the paradigms of professional development. In this scenario, it comes into play a concept called boundaryless careers, in which individuals move more freely among different organizations, dissociating their identities from specific employers and incorporating other dimensions of life - beyond their professional activities - as essential elements for their personal fulfillment. Furthermore, the new paradigm accepts temporary career interruptions in a more natural way, considering them as part of the evolution of professional and personal lives. In that regard, American researchers are increasingly investigating a movement called \"opt-out revolution\", describing highly qualified and highly performing individuals who voluntarily make a career decision contrary to the traditional premises of professional evolution. Some explanatory models have been elaborated in order to understand the motivations of these individuals, including the ABC model of kaleidoscope careers used in the present study. Despite the intense discussions abroad regarding such scenario, there are no scientific studies investigating if the opt-out movement occurs in Brazil and, if it occurs, what characteristics it has and what is the profile of professionals who adopt it - and these are the objectives of the current study. To examine these questions, a quantitative and descriptive research was performed involving 248 graduate and post-graduate alumni from the School of Economics, Management, and Accounting of the University of São Paulo (FEA USP), who attended the alumni meeting occurred in November 10th, 2007. The data was analyzed through descriptive statistics and inferential statistics (qui-square test, t-Student test, analysis of variance, correspondence analysis and factor analysis). The results permit to accept the four hypotheses proposed for this study, indicating that a significant amount of the respondents had done opt-out movements along their careers, and significant connections were found between the respondents` profiles and the adoption of opt-out movements; between the respondents` profiles and the reasons for making such decisions; and between the type of opt-out movement and the reasons for making the opt-out decisions

Acoustic detection of the spatial and temporal distribution of fish shoals in the Bay of Biscay

Echo sounder data were used to investigate the spatio-temporal variability of shoal behaviour in the Bay of Biscay. Data collected from annual surveys were processed using MOVIES-B software in order to mcasure this variability. The software was designed to measure morphological, energetic and space-time distribution descriptors from the acoustic signal received from fish shoals. Two surveys, DAAG 90 and DAAG 91, provided the appropriate characteristics for such an analysis. The survey's objective was to obtain relative abundance indices for the anchovy (Engraulis encrasicolus) biomass in the Bay of Biscay. The surveys were carried out in the same area (southern Bay of Biscay), at the same period (April) within one year interval (1990 and 1991), using the same equipment (vessel, acoustic system, fishing gear) in a multispecies environment. Frequency distributions for every descriptor were obtained and used to describe the acoustic detection of fish shoals. The analysis of frequency distributions of space-time descriptors (year, day-hour and bottom depth) allowed the construction of derived discrete variables, which defined new subsets of detections. The subsets were then described by the continuous variables. A principal components analysis was used to describe the multidimensional data structure and to describe behaviour patterns. The size and external outline unevenness are correlated groups of shoal descriptors, but are independent of the water column shoal position and the degree of internal shoal structure. An important feature is shoal size variability between years. Significant differences in shoal characteristics were found between bathymetric zones of the same region and the pattern was similar between years. This spatial wariability is related to the distribution of different species between bathymetric zones. Although it was not possible to explain size variability between years, this will be necessary to improve shoal characterization. More knowledge about oceanographic conditions, the productivity level and availability of food, predator pressure and accurate identification of shoal speeies is required, in order to study the spatial or temporal variability in size and behaviour of shoals

Acoustic detection of the spatial and temporal distribution of fish shoals in the Bay of Biscay

Echo sounder data were used to investigate the spatio-temporal variability of shoal behaviour in the Bay of Biscay. Data collected from annual surveys were processed using MOVIES-B software in order to mcasure this variability. The software was designed to measure morphological, energetic and space-time distribution descriptors from the acoustic signal received from fish shoals. Two surveys, DAAG 90 and DAAG 91, provided the appropriate characteristics for such an analysis. The survey's objective was to obtain relative abundance indices for the anchovy (Engraulis encrasicolus) biomass in the Bay of Biscay. The surveys were carried out in the same area (southern Bay of Biscay), at the same period (April) within one year interval (1990 and 1991), using the same equipment (vessel, acoustic system, fishing gear) in a multispecies environment. Frequency distributions for every descriptor were obtained and used to describe the acoustic detection of fish shoals. The analysis of frequency distributions of space-time descriptors (year, day-hour and bottom depth) allowed the construction of derived discrete variables, which defined new subsets of detections. The subsets were then described by the continuous variables. A principal components analysis was used to describe the multidimensional data structure and to describe behaviour patterns. The size and external outline unevenness are correlated groups of shoal descriptors, but are independent of the water column shoal position and the degree of internal shoal structure. An important feature is shoal size variability between years. Significant differences in shoal characteristics were found between bathymetric zones of the same region and the pattern was similar between years. This spatial wariability is related to the distribution of different species between bathymetric zones. Although it was not possible to explain size variability between years, this will be necessary to improve shoal characterization. More knowledge about oceanographic conditions, the productivity level and availability of food, predator pressure and accurate identification of shoal speeies is required, in order to study the spatial or temporal variability in size and behaviour of shoals.Des données acoustiques ont été utilisées pour étudier la variabilité spatio-temporelle du comportement des bancs de poissons dans le golfe de Gascogne. Pour mesurer cette variabilité, les données collectées pendant deux campagnes annuelles ont été traitées à l'aide du logiciel MOVIES-B. Ce logiciel est capable de calculer des descripteurs morphologiques, énergétiques et de distribution spatio-temporelle des signaux acoustiques retro-diffusés par les bancs de poissons. Les deux campagnes, DAAG 90 et DAAG 91, présentent des caractéristiques appropriées pour ce type d'analyse. Leur objectif était d'obtenir des indices relatifs d'abondance pour la biomasse de l'anchois (Engraulis encrasicolus) dans le golfe de Gascogne. Le travail de prospection a été réalisé dans la même zone (sud du golfe de Gascogne), pendant la même période de l'année (avril) avec un an d'intervalle (1990 et 1991), en utilisant le même équipement (navire, système acoustique et engin de pêche) dans un environnement multispécifique. Les distributions de fréquence de chaque descripteur ont servi pour la description des détections acoustiques des bancs de poissons. L'analyse des distributions de fréquence des descripteurs spatio-temporels (année, heure de la journée et sonde) a permis la construction des variables discrètes qui définissent des nouveaux sous-ensembles de détections. Les sous-ensembles sont décrits par les variables continues. Une analyse en composantes principales, réalisée sur les données, a permis de décrire la structure multidimensionnelle sous-jacente et de dégager des modèles de comportement. Les descripteurs de taille et les descripteurs de l'irrégularité du contour des détections de bancs sont positivement corrélés entre eux, mais non-corrélés avec la position du banc dans la colonne d'eau, ni avec le degré de structure interne du banc. Une importante variabilité de la taille des bancs de poissons a été observée entre les deux années. Les détections acoustiques des bancs sont sensiblement différentes parmi les trois zones bathymétriques dans la même région, caractéristique qui se maintient d'une année sur l'autre. La variabilité spatiale est liée à la distribution des espèces en fonction de la bathymétrie. Malgré l'impossibilité d'expliquer la variabilité de la taille des bancs entre ces deux campagnes, identifier les causes de cette variabilité sera nécessaire pour améliorer la qualité de la caractérisation des bancs de poissons. Pour étudier la variabilité spatiale ou temporelle de la taille et du comportement des bancs de poissons, une meilleure connaissance des conditions océanographiques, du niveau de productivité et de la disponibilité de nourriture, de la pression des prédateurs et une complète identification de l'espèce de poissons qui forment le banc serait nécessaire

Acoustic monitoring of gas emissions from the seafloor. Part I: quantifying the volumetric flow of bubbles

Three decades of continuous ocean exploration have led us to identify subsurface fluid related processes as a key phenomenon in marine earth science research. The number of seep areas located on the seafloor has been constantly increasing with the use of multi-scale imagery techniques. Due to recent advances in transducer technology and computer processing, multibeam echosounders are now commonly used to detect submarine gas seeps escaping from the seafloor into the water column. A growing number of en-route surveys shows that sites of gas emissions escaping from the seafloor are much more numerous than previously thought. Estimating the temporal variability of the gas flow rate and volumes escaping from the seafloor has thus become a challenge of relevant interest which could be addressed by sea-floor continuous acoustic monitoring. Here, we investigate the feasibility of estimating the volumetric flow rates of gas emissions from horizontal backscattered acoustic signals. Different models based on the acoustic backscattering theory of bubbles are presented. The forward volume backscattering strength and the inversion volumetric flow rate solutions were validated with acoustic measurements from artificial gas flow rates generated in controlled sea-water tank experiments. A sensitivity analysis was carried out to investigate the behavior of the 120-kHz forward solution with respect to model input parameters (horizontal distance between transducer and bubble stream, bubble size distribution and ascent rate). The most sensitive parameter was found to be the distance of the bubble stream which can affect the volume backscattering strength by 20 dB within the horizontal range of 0–200 m. Results were used to derive the detection probability of a bubble stream for a given volume backscattering strength threshold according to different bubble flow rates and horizontal distance