Catch and by-catch analyses of tropical tuna fishery in the Gulf of Guinea from 2010 to 2012.

Canned tuna is one of the most widespread and recognizable fish commodities in the world. Over all oceans 80% of the total tuna catches are caught by purse seine fishery and in tropical waters their target species are: yellowfin (Thunnus albacares), bigeye (Thunnus obesus) and skipjack (Katsuwonus pelamis). Even if this fishing gear is claimed to be very selective, there are high levels of by-catch especially when operating under Fish Aggregating Devices (FADs). The main problem is underestimation of by-catch data. In order to solve this problem the scientific community has developed many specific programs (e.g. Observe Program) to collect data about both target species and by-catch with observers onboard. The purposes of this study are to estimate the quantity and composition of target species and by-catch by tuna purse seiner fishery operating in tropical waters and to underline a possible seasonal variability in the by-catch ratio (tunas versus by-catch). Data were collected with the French scientific program ”Observe” on board of the French tuna purse seiner “Via Avenir” during a fishing trip in the Gulf of Guinea (C-E Atlantic) from August to September 2012. Furthermore some by-catch specimens have been sampled to obtain more information about size class composition. In order to achieve those purposes we have shared our data with the French Institute of Research for the Development (IRD), which has data collected by observers onboard in the same study area. Yellowfin tuna results to be the main specie caught in all trips considered (around 71% of the total catches) especially on free swimming schools (FSC) sets. Instead skipjack tuna is the main specie caught under FADs. Different percentages of by-catch with the two fishing modes are observed: the by-catch incidence is higher on FADs sets (96.5% of total by-catch) than on FSC sets (3.5%) and the main category of by-catch is little-tuna (73%). When pooling data for both fishing sets used in purse seine fishery the overall by-catch/catch ratio is 5%, a lower level than in other fishing gears like long-lining and trawling.

"Pásli ovce valasi": Proposta di adattamento in italiano di una serie televisiva slovacca per l'infanzia fra doppiaggio e sottotitolaggio

The main purpose of this thesis is to promote the Slovak culture in Italy through the adaptation of Pásli ovce valasi (The shepherd grazed the sheep), a TV series for children by director Ladislav Čapek. The series, which was released in Czechoslovakia in 1973, is divided into thirteen episodes and tells the story of Matko and Kubko, two shepherds who live in the mountains in central Slovakia. Pásli ovce valasi represented an interesting choice from the adaptation point of view, due to its deep cultural value and the peculiarities of the language used by the characters. The constraints of audiovisual translation were combined to the difficulty of rendering Slovak cultural-specific elements into Italian, together with the limits imposed by having children as a primary recipient. The importance of their role as a target has constrained not only our translation choices, but also the adaptation mode. For this reason, it was decided to realise subtitles in order to make the audiovisual product immediately available, together with an adaptation for dubbing, more suitable for a young audience. The opportunity to present two different forms of adaptation is closely linked to the specific characteristics of the cartoon language. The present study consists of four chapters. The first one provides a brief introduction to the series, its language and setting. The second chapter outlines the main characteristics of audiovisual translation, focusing on dubbing and subtitling in particular. It also presents an analysis of the role of children as a target and the consequent decision to realise an adaptation for dubbing. The two adaptation modes, together with the transcription of the original dialogues, are provided in the third chapter. The fourth and last chapter consists of a description and analysis of the translation process, focusing on morphosyntactic, lexical, rethorical, historical and cultural aspects. The last part of the chapter analyses the differences between the subtitles and the adaptation for dubbing.

Calculation of the eigenfunctions of the two-group neutron diffusion equation and application to modal decomposition of BWR instabilities

In this thesis, numerical methods aiming at determining the eigenfunctions, their adjoint and the corresponding eigenvalues of the two-group neutron diffusion equations representing any heterogeneous system are investigated. First, the classical power iteration method is modified so that the calculation of modes higher than the fundamental mode is possible. Thereafter, the Explicitly-Restarted Arnoldi method, belonging to the class of Krylov subspace methods, is touched upon. Although the modified power iteration method is a computationally-expensive algorithm, its main advantage is its robustness, i.e. the method always converges to the desired eigenfunctions without any need from the user to set up any parameter in the algorithm. On the other hand, the Arnoldi method, which requires some parameters to be defined by the user, is a very efficient method for calculating eigenfunctions of large sparse system of equations with a minimum computational effort. These methods are thereafter used for off-line analysis of the stability of Boiling Water Reactors. Since several oscillation modes are usually excited (global and regional oscillations) when unstable conditions are encountered, the characterization of the stability of the reactor using for instance the Decay Ratio as a stability indicator might be difficult if the contribution from each of the modes are not separated from each other. Such a modal decomposition is applied to a stability test performed at the Swedish Ringhals-1 unit in September 2002, after the use of the Arnoldi method for pre-calculating the different eigenmodes of the neutron flux throughout the reactor. The modal decomposition clearly demonstrates the excitation of both the global and regional oscillations. Furthermore, such oscillations are found to be intermittent with a time-varying phase shift between the first and second azimuthal modes.