As the understanding of the workings of the biological world expands, biomimetic designs increasingly move into the focus of engineering research studies. For this thesis, two studiesinvolving leading edge vortex generation for lift production as observed in nature were explored intheir respective flow regimes. The first study focused on the steady state analysis of streamwise vortices generated byleading edge tubercles of an adult humpback whale flipper. A realistic scaled model of a humpbackflipper was fabricated based on the 3D reconstruction from a sequence of 18 images taken whilecircumscribing an excised flipper of a beached humpback whale. Two complementary modelswith smooth leading edges were transformed from this original digitized model and fabricatedfor testing to further understand the effect of the leading edge tubercles. Experimentally-obtainedforce and qualitative flow measurements were used to study the influence of the leading edgetubercles. The presence of leading edge tubercles are shown to decrease maximum lift coefficient(Cl ), but increase Cl production in the post-stall region. By evaluating a measure of hydrodynamicefficiency, humpback whale flipper geometry is shown to be more efficient in the pre-stall regionand less efficient in the post-stall region as compared to a comparable model with a smooth leadingedge. With respect to a humpback whale, if the decrease in efficiency during post-stall angles ofattack was only required during short periods of time (turning), then this decrease in efficiencymay not have a significant impact on the lift production and energy needs. For the pursuit ofbiomimetic designs, this decrease in efficiency could have potential significance and should beinvestigated further. Qualitative flow measurements further demonstrate that these force results aredue to a delay of separation resulting from the presence of tubercles.The second study investigated explored the effects of flapping frequency on the passive flowcontrol of a flapping wing with a sinusoidal leading edge profile. At a flapping frequency of f =0.05 Hz, an alternating streamwise vortical formation was observed for the sinusoidal leading edge,while a single pair of vortices were present for the straight leading edge. A sinusoidal leading edgecan be used to minimize spanwise flow by the generation of the observed alternating streamwisevortices. An increase in flapping frequency results in these streamwise vortices becoming stretchedin the path of the wing. The streamwise vortices are shown to minimize spanwise flow even afterbeing stretched. Once instabilities are formed at f ≥ 0:1 Hz due to velocity shearing generatedby the increase in cross-radial velocity, the alternating streamwise vortices begin to break downresulting in a increase of spanwise flow.

No description available.

<p>In the current fast-moving, global and complex business world, implementing organisational change has become one of the major leadership issues. Indeed, competitive organisations are turning out to be the ones that are flexible, able to adapt rapidly and continuously; strong leaders are turning out to be the ones who are transformational and who are able to implement change successfully.</p><p>However, as the business world is becoming more complex, organisations are following the same path and are developing increasingly complicated structures. Risk of failure in implementing change in such complex organisations is consequently high and leaders must lead strategic moves with dexterity. They must understand their role, the required skills as well as the importance of the people while starting to implement change. They must understand where to exert their influence and they should therefore be able to determine what are the key success factors to be taken into consideration in the implementation process.</p>

本篇論文主要在討論兩個人參選時的開票情況，研究「n+m人投票且無人投廢票的情況下，其中一人至少得n票且一路領先的開票方法數等於此人得n票的所有開票方法數」 ，第一章介紹研究動機及他人所使用的方式，使用路徑的方法證明一人得n票，另一人得m票，n≥m，得n票的人一路領先且勝出的方法數等於 C_n^(m+n)-C_(n+1)^(m+n)=C_m^(m+n)-C_(m-1)^(m+n)，再用計算相消的方式算出，此人至少得n票且一路領先的開票方法數等於此人得n票的所有開票方法數。 第二章介紹用一個折路徑的方法，將所有「一人得n票開票方法數」中非一路領先的路徑圖，經由一個壓扁、翻轉的摺紙方式，對應到「此人至少得n票且一路領先」的開票情況路徑圖，經由數學論證，這樣的路徑，是一對一且映成，並舉出兩個例子驗證其結果。 論文最後，提出一個猜想：若參選人數為三人時，其中一位參選人一路領先且勝出的開票方法數，應該可以用立體空間的方塊圖之路徑來證明。本篇論文，雖然沒有繼續討論這個有趣的問題，但也留下一個新的研究方向。 / The theme of this thesis is mainly to discuss of situation of counting and announcing the ballots in an election with two candidates. In explaining the contents of the "Total n+m votes, there’s no invalid vote. One candidate wins at least n votes and lead all the way. Under this circumstance this number of the way will be equal to all numbers of the way for these n votes of this candidate.” At first, we will introduce the methodology of the other adopt, the methodology of previous path of way proves one candidate known to have n votes, another candidate has m votes, the method of candidate with n votes who leads all the way and won will be equal to C_n^(m+n)-C_(n+1)^(m+n)=C_m^(m+n)-C_(m-1)^(m+n), and then result of calculating cancellation will prove this candidate will have at last n votes and leads the way to victory will be equal to all the methodologies of counting and announcing the ballots in this election. A method of flip the path will be introduced in the second chapter. Corresponding to the road map of ballot counting for the candidate who has n votes and lead the way to victory, the road map of same one with n votes without leading the way through a step-ping, flip the way of origami will be mathematically proves such reflect of the way will be reflect one to one and onto. By means of the discrete method is able to prove this result and the method to verify availability Finally, I would like to propose a surmise: If the number of candidates increased to 3, the methodology of the one who leads all the way should be able to use three-dimensional space of a block diagram of the path to prove. Although this thesis does not to continue pondering the interesting question, but also left a new research direction.

Thesis advisor: Harold A. Petersen / This paper attempts to find the extent of the predictive power of the stock market in relation to consumption, non-residential investment, and corporate profits. Initially, a naïve model is formulated to assess the impact of the stock market on GDP, and then the model is used to find the predictive power of the stock market on the components. This component analysis compares the impact of the market on each of the components and attempts to find reasons for the variations in impact. Finally, the long term predictive power of the various models is assessed. / Thesis (BS) — Boston College, 2005. / Submitted to: Boston College. College of Arts and Sciences. / Discipline: Economics Honors Program.

O presente trabalho tem por finalidade a obtenção de curvas que regem o comportamento estático da sustentação e arrasto de uma asa em função da variação de seu câmber através do uso do flape de bordo de ataque, com base em resultados experimentais obtidos em túnel de vento. O estudo inclui uma revisão sobre o uso de flapes de bordo de ataque e uma descrição dos ensaios em túnel de vento. O modelo tridimensional da asa utilizada para os experimentos contém um flape de bordo de ataque em metade de sua envergadura e foi construído segundo o perfil GA(W)-1. O experimento inclui a determinação da sustentação e do arrasto para cada valor do ângulo de ataque da asa e do ângulo do flape de bordo de ataque. O objetivo é obter uma correlação ótima entre estes dois ângulos de forma que, para cada ângulo de ataque da asa seja determinado um ângulo ótimo do flape de bordo de ataque que confira a máxima sustentação. / The present work has for purpose the attainment of curves that conduct the static behavior of the lift and drag of a wing in function of the variation of its camber through the use of the leading edge flap, on the basis of gotten experimental results obtained in the wind tunnel. The study includes a revision of the use of leading edge flaps and a description of the wind tunnel tests. The three-dimensional model of the wing used in the experiments contains a leading edge flap along half of the span and was constructed with a GA(W)-1 section profile. The experiment includes the determination of lift and drag for each value of angle of attack of the wing and each angle of the leading edge flap. The objective is to obtain a good correlation between the two angles in such a way that, for each angle of attack of the wing there is determined an excellent angle of the leading edge flap that confers principle lift.

O presente trabalho tem por finalidade a obtenção de curvas que regem o comportamento estático da sustentação e arrasto de uma asa em função da variação de seu câmber através do uso do flape de bordo de ataque, com base em resultados experimentais obtidos em túnel de vento. O estudo inclui uma revisão sobre o uso de flapes de bordo de ataque e uma descrição dos ensaios em túnel de vento. O modelo tridimensional da asa utilizada para os experimentos contém um flape de bordo de ataque em metade de sua envergadura e foi construído segundo o perfil GA(W)-1. O experimento inclui a determinação da sustentação e do arrasto para cada valor do ângulo de ataque da asa e do ângulo do flape de bordo de ataque. O objetivo é obter uma correlação ótima entre estes dois ângulos de forma que, para cada ângulo de ataque da asa seja determinado um ângulo ótimo do flape de bordo de ataque que confira a máxima sustentação. / The present work has for purpose the attainment of curves that conduct the static behavior of the lift and drag of a wing in function of the variation of its camber through the use of the leading edge flap, on the basis of gotten experimental results obtained in the wind tunnel. The study includes a revision of the use of leading edge flaps and a description of the wind tunnel tests. The three-dimensional model of the wing used in the experiments contains a leading edge flap along half of the span and was constructed with a GA(W)-1 section profile. The experiment includes the determination of lift and drag for each value of angle of attack of the wing and each angle of the leading edge flap. The objective is to obtain a good correlation between the two angles in such a way that, for each angle of attack of the wing there is determined an excellent angle of the leading edge flap that confers principle lift.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography: leaves 144-148. / by David Scott Greeley. / Ph.D.

Esta pesquisa de mestrado discute, através de autores enraizados nas artes visuais e também em outras arenas, como a sociologia e a antropologia, as relações interpessoais em dois trabalhos coletivos e colaborativos de arte, focando nos papéis que cada agente exerce nas produções e questionando se há a presença de suas particularidades sociais e culturais nestas práticas. Focando-se nos coletivos Sopapo de Mulheres, de Porto Alegre, e Dulcinéia Catadora, de São Paulo, ambos compostos por mulheres, a presente dissertação questiona como estas duas práticas agregam às suas agendas as peculiaridades, os devires de cada agente, e como estas negociações possibilitam trabalhos de arte pautados na colaboração e protagonismo de suas integrantes. Buscando diálogos com outros trabalhos em arte colaborativa realizados em território brasileiro, são levantados pressupostos a respeito da progressiva produção de trabalhos de teor colaborativo em zonas periféricas no país, bem como as modificações que seus locais de origem e inserção sofrem após agenciamentos que modificam partilhas comuns, rearranjando papéis e criando novas audiências. / This master research discuss, through authors from the visual arts and other areas, such as sociology and anthropology, the interpersonal relationships in two collective and collaborative works, focusing in the roles that each one practice in the productions and questioning if their social and cultural peculiarities are present in these activities. Focusing in the collective groups Sopapo de Mulheres, from Porto Alegre, and Dulcinéia Catadora, from São Paulo, both formed by women, the present master thesis question how these two groups assemble to their agendas the particularities, becomings, of each person, and how these negotiations enable art works based in the collaboration and leading role of its members. Pursuing a dialogue with other studies about collaborative art made in Brazil, assumptions are raised about the progressive production of collaborative works in the country’s suburb zones, as well as the transformations that their origin and context place suffer after agency services modify ordinary distributions, rearranging roles and creating new audiences.

The thesis is dedicated to describe area of change management in terms of its impact on employees. The theoretical part explains the term from different perspectives, explains the types of changes and their various impacts on implementation strategy of transformation projects. It sets out the emotional aspect of the change and ways how to lead employees in the process of overcoming natural resistance towards new reality. The practical part of the work is devoted to describe change framework in a particular company. This part evaluates contribution of the framework by comparing it with theoretical methodologies and with real experience of chief operating officer with past transformation project.