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This dissertation is an empirical investigation into the distributive effects of overand under-education, defined as market outcomes such that some workers possess skills over or below those required at their jobs respectively. This type of market failure can arise in assignment and search equilibrium settings, as well as in the presence of asymmetric information regarding workers' performance on the job. The existence of permanent and sizable mismatch rates means that returns to education are depressed for over-educated workers and in ated for under-qualified workers. Thus, irreversible decisions to invest in human capital are made in a context of uncertainty regarding the exact outcomes that might arise. As in the Todaro model, where individuals decide whether to migrate to cities based on the expected values of the available alternatives, workers might decide it is worthwhile to keep investing in education even if the probability of finding appropriate employment is falling. The three chapters of the dissertation are entitled: Skill Mismatch and Earnings: A Panel analysis of the U.S. Labor Market," Earnings Inequality and Skill Mismatch in the U.S: 1973-2003," and Employment and Distribution Effects of Changes in the Minimum Wage." Skill Mismatch and Earnings: A Panel analysis of the U.S. Labor Market This chapter examines the effect on earnings induced by a mismatch between workers' skills and the skills actually required on the job. It uses the Current Population Survey (CPS) for the period 1983-2002. The special re-interview methodology of the CPS is used to create a large panel, so that individual heterogeneity can be controlled for. Skill requirements are estimated by the median education level for each 3-digit occupation in the 1980 census occupational classification. The analysis, including the determination of skill requirements, is conducted for males and females separately. Cross-sectional analysis confirms the findings in the recent literature. Returns to required schooling are higher than the returns to attained education in standard earnings regressions. Also, for workers with similar educational attainment, over-education reduces earnings and under-education increases them. Contrary to what other studies have found, we conclude that these results are confirmed after controlling for individual fixed effects. The chapter also investigates which groups are more exposed to mismatch. I use standard probit analysis with over-education and under-education as the respective dependent variables. Women, service sector, and non-unionized workers appear to have higher probabilities of mismatch. Earnings Inequality and Skill Mismatch This chapter shows that skill mismatch is a significant source of inequality in real earnings in the U.S. and that a substantial fraction of the increase in wage dispersion during the period 1973-2002 was due to the increase in mismatch rates and mismatch premia. Standard human capital earnings regressions that do not decompose the education variable into required, surplus, and deficit years provide biased estimates of the relative importance of education in explaining earnings inequality. In 2000-2002 surplus and deficit qualifications taken together accounted for 4:3 and 4:6 percent of the variance in earnings, or around 15 percent of the total explained variance. The dramatic increase in over-education rates and premia accounts for around 11 and 32 percent of the increase in the coeffcient of variation of log earnings during the 30 years under analysis for males and females respectively. Residual inequality is slightly diminished when the estimating equation allows the prices of surplus, required and deficit qualifications to differ but the well-studied increasing trend of within-group inequality remains otherwise unchanged. Changes in the composition of the labor force are found to be important predictors of increasing residual inequality even when skill mismatch is taken into account. The Distributive Effects of the Minimum Wage: an Effciency Wage Model with Skill Mismatch (co-authored with Peter Skott) This chapter analyzes the effect of changes in the real value of the minimum wage on the wage distribution. Changes in the minimum wage and other labor market institutions affect workers in all groups and empirically appear to be good complement to standard supply and demand arguments in explaining overall inequality. We use an effciency wage model but allow for mismatch between jobs and workers. This framework yields predictions not only on the skill premium but also on the extent of inequality within groups. To keep matters as simple as possible, we assume that high-skill workers can get two types of jobs (good and bad), whereas low-skill workers have only one type of employment opportunity (bad). As long as some matches of high-skill workers and bad jobs are sustained in equilibrium, changes in the exogenous variables will affect not only wages and employment rates but also the degree of mismatch. Thus, this paper shows that `over-education' can be generated endogenously in effciency wage models and that a fall in the real value of the minimum wage can (i) reduce total employment, (ii) lead to a simultaneous decline in both the relative employment and the relative wage of low-skill workers, and (iii) produce a rise in within-group as well as between-group inequality. Evidence from the US suggests that these theoretical results are empirically relevant.

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Tendo em vista o crescente investimento em atividades economicamente importantes nas zonas costeiras, tal como a produção petrolífera brasileira e o crescimento na atividade portuária e esforço de pesca, a compreensão adequada dos fenômenos oceanográficos e meteorológicos sobre tais zonas é de grande valia para as operações desses setores. Os ventos representam um importante parâmetro para análise nesse sentido, sendo a principal fonte de energia para a geração de ondas de gravidade nos oceanos, e determinantes na caracterização de condições severas tempo. Uma série de estudos foram desenvolvidos nos últimos anos envolvendo a análise do comportamento dos extremos de ondas sobre a região do Oceano Atlântico Sul, de acordo com o crescimento da demanda por tais informações pelo setor industrial. No entanto, há poucos registros de estudos que caracterizem os extremos de intensidade de vento sobre essa região. E, em nenhum desses trabalhos, a separação direcional do vento extremo e seus fenômenos causadores foram levados em consideração. Dessa forma, o presente trabalho visa atender diretamente a necessidade por trabalhos nesse sentido para a região do Oceano Atlântico Sul, buscando oferecer uma análise dos campos de ventos extremos direcionalmente segregados, através de dados do projeto de reanálise \\textit{NCEP/NCAR Reanalysis I} e de resultados de uma simulação numérica com o modelo BRAMS. A tais conjuntos de dados foi aplicada a metodologia de análise de extremos \\textit{Peaks Over Threshold} (POT), que trata do ajuste dos excessos acima de um limiar estabelecido a uma distribuição conhecida, a Distribuição Generalizada de Pareto (Generalized Pareto Distribution - GPD). E, a partir disso, construir mapas com os valores extremos de retorno para longos períodos. Tais parâmetros são muito importantes na predição de eventos extremos e no refinamento de simulações de longo período. Os extremos relacionados aos fenômenos em larga escala, dados pelos campos do NCEP, em conjunto com o maior detalhamento em mesoescala, dado pelo BRAMS, refletiram diretamente no comportamento dos valores extremos de retorno. Para todas as direções do vento analisadas, observaram-se feições mais refinadas dos extremos de retorno para os resultados com a simulação do BRAMS, principalmente nas zonas costeiras. Essas feições, principalmente àquelas ao sul e sudeste do Oceano Atlântico Sul, tiveram seus valores potencializados em zonas já conhecidas na bibliografia pela grande incidência de eventos altamente energéticos. / Given the growing investment in important economic activities in coastal areas, such as oil and gas exploitation, harbor activities and increasing fishing effort, the proper understanding of oceanographic and meteorological phenomena over such areas has great value to the operations of such sectors. The winds are an important parameter for analysis in this context, being the main source of energy for gravity waves generation in the ocean, and determining the characterization of severe weather conditions. A number of studies have been developed in recent years involving the behavior of extreme waves over the South Atlantic Ocean region, given the rowing demand for such information by industrial sectors. However, there are few records of studies that characterize the extremes of wind speed fields over this region. And, in none of these works, the direction of the extreme wind and meteorological phenomenon associated were considered. Thus, this paper aims to address directly the need for work in this context for the South Atlantic Ocean region, seeking to offer an analysis of extreme wind fields directionally separated, through data from the NCEP/NCAR Reanalysis 1 and results from a numerical simulation with BRAMS. The Peaks Over Threshold (POT), which deals with the adjustment of the excesses above a threshold to the Generalized Pareto Distribution (GPD), was applied to both datasets. And from that, maps with the extreme return values have been developed for long return periods. These parameters are very important in predicting extreme events and refinement of long-period simulations. Extreme winds related to the large scale phenomena, represented by NCEP fields, in conjunction with the greater mesoscale detail, given by the BRAMS simulation, directly reflected in the behavior of extreme return values. For all wind directions analyzed, there were more refined features of the extremes return levels given by the BRAMS simulation, especially in coastal areas. These features, notably those in the south and southeast of the South Atlantic Ocean, values were strengthened in areas already known in the literature for the high incidence of energetic events.

The research is a qualitative exploration of perceptions of adolescent mental health and collaborative working concerning this. There are rising numbers of young people with difficulties relating to mental health and a need to develop closer links between services and schools has been identified (Department for Education, 2015b). However, there is not enough known about how agencies work together, despite their differences, in order to effectively support adolescent mental health. Part one utilised semi structured interviews to explore, in depth, how, educational psychologists (EPs), Children and Adolescent Mental Health Service (CAMHS) professionals and secondary school staff view adolescent mental health with regards to issues, practices, collaboration and how they view their own and other’s roles in supporting young people with mental health difficulties. Part two consisted of discussion groups guided by the use of vignettes, in order to explore the ways in which, EPs, CAMHS professionals and secondary school staff problem solve both in their own professional group and in a multi-agency group to explore the commonalities and differences in this. Findings from part one indicate that there are differences in perceptions of adolescent mental health across these three groups, with particular regards to their own and each other’s roles. Further to this findings indicate a lack of a shared understanding, characterised by a level of departmentalism. Findings from part two indicate that there are significant differences between the way in which schools, EPs and CAMHS professionals make sense of cases and in the way in which they work in their own professional group compared to how they work in multiagency groups. There were also indications that the differences that were found between groups in both part one and two, actually worked to increase the effectiveness of the approach in the multiagency groups, creating an enhanced and richer understanding of the problem given. Overall findings indicate that although on the surface thinking appears similar there are significant differences in thinking across EPs, CAMHS and schools in this area. Implications and recommendations for practice include; developing clarity and transparency regarding roles and fostering closer links by developing a shared understanding through opportunities for joint training.

Cette thèse présente une réflexion sur les verbes à particule et les verbes prépositionnels en anglais. La relation qui existe entre la syntaxe et la sémantique est une des pierres angulaires de cette étude. Nous étudierons le rôle de la configuration syntaxique, de la structure argumentale et des connaissances extralinguistiques dans la construction du sens. Nous analyserons également le nombre d’arguments, tels qu’ils apparaissent dans une combinaison, ainsi que leur type sémantique en contexte et la manière dont ces deux paramètres peuvent influencer l’interprétation sémantique finale. Les aspects théoriques abordés sont la catégorisation des particules et des prépositions, l’interaction du sémantisme des particules - prépositions et le sémantisme verbal, la structure interne des verbes à particule, et les raisons pour lesquelles les particules peuvent apparaître soit avant, soit après le complément régi par le verbe. Nous aborderons également certaines questions plus générales telles que la conceptualisation du mouvement, la résultativité, la transitivité et la polysémie. Le travail a été effectué à partir d’un corpus de 286 combinaisons formées d’un élément verbal et over. Chaque combinaison est analysée en contexte afin d’identifier les facteurs qui influencent l’interprétation sémantique finale de la combinaison. Au cours de cette étude, nous identifierons toute une gamme de facteurs qui influencent l’interprétation sémantique finale des verbes à particule et des verbes prépositionnels anglais ainsi que leur interaction. / This thesis explores the construction of sense in English particle and prepositional verbs. It departs from the premise that meaning is something constructed during the process of situated usage. A corpus of 286 combinations formed through the association of a verbal element with over are analysed in context in order to identify the various factors which influence final semantic interpretation. A particular focus of the study is the relationship between form and meaning. The relationship between syntactic configuration and semantic interpretation is investigated and the various ways in which the number and nature of the verbal and/or prepositional arguments can impact semantic interpretation is explored. The role of the extralinguistic in the construction of sense is examined. The major theoretical questions dealt with concern the categorisation of particles and prepositions, the interaction between particle/prepositional semantics and verbal semantics, the internal structure of particle verbs, and the reasons why the particle in a particle verb can either precede or follow the verbal object. The study also explores several more general areas of linguistic investigation including the conceptualisation of movement, resultativity, transitivity and polysemy. During the course of the study a wide range of factors which influence the final semantic interpretation of particle and prepositional verbs in English are identified.