Thesis (M.S.)--Ohio University, June, 1992. / Title from PDF t.p.

Thesis (Ed. D.)--Teachers College, Columbia University, 1971. / Typescript; issued also on microfilm. Sponsor: Margaret G. Tyson. Dissertation Committee: Francis Shoemaker. Includes bibliographical references (leaves 165-173).

Thesis (M.A.)--Zhongguo wen hua xue yuan. / Reproduced from typescript. Bibliography: leaves 42-45.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1970. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Resumo: Neste trabalho, um estudo experimental do escoamento em cavidades abertas, para diferentes razões de aspecto e números de Reynolds, foi realizado. Para a condução da campanha de ensaios, um canal de superfície livre em circuito fechado foi projetado e construído. Testes de qualificação foram conduzidos, com o propósito de verificar as características vibratórias do aparato e a qualidade do escoamento na seção de testes. A partir dos dados coletados nessa etapa, modificações foram introduzidas no projeto, melhorando significativamente as condições de funcionamento do dispositivo. Em seguida, os ensaios das cavidades abertas, propriamente ditos, foram executados. Para a determinação qualitativa dos padrões de escoamento encontrados em cavidades rasas e profundas, visualizações de escoamento foram realizadas, utilizando-se, como traçadores, corante líquido e partículas sólidas em suspensão. Com uma iluminação adequada, as duas técnicas foram capazes de fornecer elementos importantes para a identificação topológica deste tipo de escoamento. Além disso, medições de velocidade local e instantânea foram realizadas, dentro e fora das cavidades, com o auxílio de uma sonda ADV (acoustic Doppler velocimetry). Os resultados obtidos foram analisados fisicamente e comparados com dados experimentais e numéricos da literatura, apresentando excelente concordância / Abstract: In this work, an experimental study of the flow inside open cavities, for different aspect ratios and Reynolds numbers, was performed. To carry out the experimental runs, a closed-circuit free-surface water channel has been designed and built. Qualification tests have been conducted to verify the vibrating characteristics of the device and the quality of the flow in the test section. From the data collected in this stage, constructive changes have been proposed and executed in the apparatus, improving significantly its operational conditions. Soon after the open cavities tests have been performed. For qualitative determination of the fluid motion inside deep and shallow cavities, flow visualizations techniques have been implemented using as tracers liquid dye and solid micro-particles in suspension. With the help of an adequate illumination system, both techniques were able to provide important information about the topological structure of the flow. Measurements of local instantaneous speed have also been performed within and outside the cavities by means of an ADV probe (acoustic Doppler velocimetry). The results have been physically analyzed and compared with available experimental and numerical data. An excellent agreement has been reached / Orientador: Sérgio Said Mansur / Coorientador: Edson Del Rio Vieira / Banca: João Batista Campos Silva / Banca: Aristeu da Silveira Neto / Mestre

The rural brain drain, an event wherein a rural locale's educated youth out-migrates, is speculated to be the root cause of nonmetropolitan human capital exhaustion. This study promotes the speculation that community colleges hold promise in reversing the brain drain, as they are primed to elevate the human capital level of stayers while offering programs of interest through which job opportunities may be made available to those who choose to leave. This study was developed to ascertain whether any differences existed in stayers' and leavers' perceptions of several community college facets, such as perceived learning gains, initial impressions, student-institution bond, institutional fit, and intent to leave. A quantitative study was designed, and independent t-tests were utilized in order to test whether any significant differences existed between the populations of “would-be-stayers” and “would-be-leavers.” A web-based survey entitled the Student Community College Perception Instrument was emailed to all currently- enrolled students at a single, rural community college in the Southeastern United States. Responses were collected from 310 students who were enrolled full-time. Roughly 79% of students who participated in the study lived in one of the counties within the community college district; of these, approximately 57% chose that they planned on leaving the area, whilst 43% indicated they planned to stay. Of the remaining participants, 65% planned to leave the area in which they currently resided (outside of the college district), while 35% who did not live in the district were planning to stay. All 4 of these groups rated 32 statements concerning their perceptions of the community college. Significant differences were found between the leavers and stayers, as the stayers were less likely than leavers to transfer or withdraw from the college within 6 months, more positively perceived that the college offered academic programs they were interested in, and that the college was assisting them in developing more self-confidence and helping to make them aware of diversity issues, while preparing them to be future leaders. Overall, the stayers had more positive perceptions concerning their initial impressions of the college, their institutional fit, the student-community college bond, and their perceived learning goals.

No description available.

No description available.

published_or_final_version / Business Administration / Master / Master of Business Administration

The pace of international skilled migration has accelerated during recent decades and it has attracted considerable attention. In particular, recent data suggest that emigration of highly skilled people from developing countries is a more and more relevant phenomena. This thesis contributes to the brain drain debate and it gives particular attention to the role of diaspora externalities in inducing economic development in migrants’ originating countries. In particular: Chapter 1 gives a general and critical idea of the brain drain issue with particular attention to diaspora networks. Chapter 2 empirically evaluates the impact of the skilled diaspora abroad on the aggregate amount of FDI inflows in the countries of origin. Chapter 3 deals with diaspora externalities and technology transfer. It shows that skilled migration increases TFP growth in areas far from the technological frontier. Finally, Chapter 4 presents a CGE model of the world economy. This model combines the major results of existing theoretical and empirical literature in a general equilibrium framework of world economy and it provides a more thorough analysis regarding the total effects of skilled-biased out-migration on developing countries. It assesses the significance of several feedback effects due to migration, and in particular it considers the network effects considered in chapter 2 and 3. / L’ampleur de la migration qualifiée s'est intensifiée au cours des dernières décennies et a attiré une attention considérable. En particulier, de récentes données suggèrent que l'émigration des personnes hautement qualifiées originaires de pays en développement est un phénomène de plus en plus préoccupant. Cette thèse contribue au débat sur la fuite des cerveaux et accorde une attention particulière au rôle qu’ont les externalités de la diaspora dans le développement économique des pays d’origine des migrants. En particulier: Le chapitre 1 donne une idée générale et critique sur la fuite des cerveaux avec une attention particulière aux effets de diaspora. Le chapitre 2 évalue empiriquement l'impact de la diaspora qualifiée sur le montant global des apports d'investissements étrangers directs dans les pays d'origine. Le chapitre 3 s'intéresse aux externalités liées à la diaspora et au transfert de technologie. Il montre que la migration qualifiée augmente la croissance de la productivité globale des facteurs dans les régions loin de la frontière technologique. Enfin, le chapitre 4 présente un modèle d’équilibre général calculable de l'économie mondiale. Le modèle assemble les principaux résultats des études théoriques et empiriques dans la littérature dans le modèle d'équilibre général de l'économie mondiale, et fournit une analyse plus approfondie de l’impact de l’émigration qualifiée sur les pays en développement. Il évalue l'importance des effets secondaires de la migration, et en particulier, il tient compte des effets de réseau identifiés dans les chapitres 2 et 3.