O objetivo deste trabalho é apresentar um estudo comparativo entre as principais tecnologias utilizadas como fonte de luz para faróis automotivos. Inicialmente, esta dissertação apresenta uma breve introdução sobre a história dos faróis automotivos, desde os primeiros modelos até os protótipos em desenvolvimento que utilizam diodos emissores de luz (LEDs). Estes últimos surgem como uma possível alternativa às tradicionais lâmpadas incandescentes ou àquelas que funcionam por de descarga de gás. A tecnologia dos faróis a LED é baseada nos semicondutores emissores de luz branca de alto desempenho. Porém, apenas recentemente, esta tecnologia apresentou os primeiros sinais de viabilidade para aplicações automotivas devido ao crescente incremento na intensidade da luz emitida por estes semicondutores. Para desenvolver o estudo comparativo proposto, foram selecionados três faróis, sendo dois deles representantes das tecnologias atuais e o outro um farol a LED. Foram também estabelecidos critérios para comparação entre os seus desempenhos e realizados ensaios experimentais. Por fim, este trabalho fornece, sinteticamente, os principais resultados dos ensaios, enumerando as vantagens e desvantagens dos faróis com LEDs frente aos convencionais, além das barreiras existentes para aplicação desta nova tecnologia. / This work aims to present a comparative study among main technologies used as light sources for automotive headlamps. Initially, this thesis presents a brief introduction on the history of automotive headlamps, since the first models until the prototypes under development employing Light Emitting Diodes (LEDs). These last ones appear as a possible alternative to either traditional incandescent light or even to gas discharge bulbs. The technology of the LED-headlamps is based on high performance white light emitting semiconductors. In fact, recently this technology presented the first signals of feasibility for automotive applications due to the growing increment in the intensity of the light emitted by these semiconductors. To develop the proposed comparative study, three headlamps were selected, being two of them representatives of the current technologies and the other one is a LEDheadlamp. Some criteria for comparison among their performances had been established and experimental tests were also performed. Finally, this work supplies, synthetically, the main results of the tests, enumerating the advantages and disadvantages of LED-headlamps in comparison with conventional ones. In addition to, it comments the existing barriers for application of this new technology as well.

O princípio estrutural das pontes estaiadas não é tão recente quanto as pontes propriamente ditas. Em algumas estruturas, tais como passarelas, embarcações e tendas, já se usavam cabos como sustentação. Com a evolução da tecnologia e dos materiais, houve a possibilidade de um aperfeiçoamento dessas técnicas e sua utilização nas mais diversas áreas. As pontes estaiadas surgiram como uma alternativa eficaz para transpor grandes vãos, possibilitando a utilização de estruturas mais leves, esbeltas e econômicas. Este trabalho apresenta a evolução das pontes estaiadas no mundo e no Brasil, enfatizando os seus aspectos históricos, as novas tecnologias empregadas nestes projetos, as diversas possibilidades de geometria da estrutura e os métodos construtivos empregados nestas pontes. Para as pontes estaiadas ao redor do mundo, é elaborada uma análise geral, demonstrando sua importância ao longo da história e as vantagens que as mesmas propiciaram para o suprimento das necessidades da humanidade. Fazendo uma análise especial das pontes estaiadas brasileiras, é elaborada uma listagem das mesmas por ordem cronológica, indicando suas principais características. Finalmente, para as pontes estaiadas nacionais de maior destaque, é feita uma análise mais detalhada das suas principais características quanto ao vão central, geometria da ponte, processo construtivo, curiosidades sobre o empreendimento e período de construção. / The structural principle of cable stayed bridges is not as recent as the bridges themselves. In some structures such as catwalks, boats and tents, cable were already used as a support. With the evolution of technology and materials, there was the possibility of an improvement of these techniques and their use in several areas. The cable-stayed bridges have emerged as an effective alternative to large- span bridge, allowing the use of lighter, slim and economical structures. This paper presents the evolution of cable-stayed bridges in the world and in Brazil, emphasizing the historical aspects, the new technologies employed in these projects, the various possibilities for the geometry of the structure and the construction methods employed in these bridges. A general analysis of cable stayed bridges around the world is done, being shown their importance throughout history and the advantages that they have brought to fulfill the needs of mankind A special analysis of cable stayed bridges in Brazil will be is made a list of them in a chronological order is presented and their main features are examined. Finally, for the most prominent Brazilian cable stayed bridges national prominence, a more detailed analysis of its key features is done, being examined the central span, the bridge geometry, the constructive process, curiosities about the new development and the construction period.

O princípio estrutural das pontes estaiadas não é tão recente quanto as pontes propriamente ditas. Em algumas estruturas, tais como passarelas, embarcações e tendas, já se usavam cabos como sustentação. Com a evolução da tecnologia e dos materiais, houve a possibilidade de um aperfeiçoamento dessas técnicas e sua utilização nas mais diversas áreas. As pontes estaiadas surgiram como uma alternativa eficaz para transpor grandes vãos, possibilitando a utilização de estruturas mais leves, esbeltas e econômicas. Este trabalho apresenta a evolução das pontes estaiadas no mundo e no Brasil, enfatizando os seus aspectos históricos, as novas tecnologias empregadas nestes projetos, as diversas possibilidades de geometria da estrutura e os métodos construtivos empregados nestas pontes. Para as pontes estaiadas ao redor do mundo, é elaborada uma análise geral, demonstrando sua importância ao longo da história e as vantagens que as mesmas propiciaram para o suprimento das necessidades da humanidade. Fazendo uma análise especial das pontes estaiadas brasileiras, é elaborada uma listagem das mesmas por ordem cronológica, indicando suas principais características. Finalmente, para as pontes estaiadas nacionais de maior destaque, é feita uma análise mais detalhada das suas principais características quanto ao vão central, geometria da ponte, processo construtivo, curiosidades sobre o empreendimento e período de construção. / The structural principle of cable stayed bridges is not as recent as the bridges themselves. In some structures such as catwalks, boats and tents, cable were already used as a support. With the evolution of technology and materials, there was the possibility of an improvement of these techniques and their use in several areas. The cable-stayed bridges have emerged as an effective alternative to large- span bridge, allowing the use of lighter, slim and economical structures. This paper presents the evolution of cable-stayed bridges in the world and in Brazil, emphasizing the historical aspects, the new technologies employed in these projects, the various possibilities for the geometry of the structure and the construction methods employed in these bridges. A general analysis of cable stayed bridges around the world is done, being shown their importance throughout history and the advantages that they have brought to fulfill the needs of mankind A special analysis of cable stayed bridges in Brazil will be is made a list of them in a chronological order is presented and their main features are examined. Finally, for the most prominent Brazilian cable stayed bridges national prominence, a more detailed analysis of its key features is done, being examined the central span, the bridge geometry, the constructive process, curiosities about the new development and the construction period.

O objetivo deste trabalho é apresentar um estudo comparativo entre as principais tecnologias utilizadas como fonte de luz para faróis automotivos. Inicialmente, esta dissertação apresenta uma breve introdução sobre a história dos faróis automotivos, desde os primeiros modelos até os protótipos em desenvolvimento que utilizam diodos emissores de luz (LEDs). Estes últimos surgem como uma possível alternativa às tradicionais lâmpadas incandescentes ou àquelas que funcionam por de descarga de gás. A tecnologia dos faróis a LED é baseada nos semicondutores emissores de luz branca de alto desempenho. Porém, apenas recentemente, esta tecnologia apresentou os primeiros sinais de viabilidade para aplicações automotivas devido ao crescente incremento na intensidade da luz emitida por estes semicondutores. Para desenvolver o estudo comparativo proposto, foram selecionados três faróis, sendo dois deles representantes das tecnologias atuais e o outro um farol a LED. Foram também estabelecidos critérios para comparação entre os seus desempenhos e realizados ensaios experimentais. Por fim, este trabalho fornece, sinteticamente, os principais resultados dos ensaios, enumerando as vantagens e desvantagens dos faróis com LEDs frente aos convencionais, além das barreiras existentes para aplicação desta nova tecnologia. / This work aims to present a comparative study among main technologies used as light sources for automotive headlamps. Initially, this thesis presents a brief introduction on the history of automotive headlamps, since the first models until the prototypes under development employing Light Emitting Diodes (LEDs). These last ones appear as a possible alternative to either traditional incandescent light or even to gas discharge bulbs. The technology of the LED-headlamps is based on high performance white light emitting semiconductors. In fact, recently this technology presented the first signals of feasibility for automotive applications due to the growing increment in the intensity of the light emitted by these semiconductors. To develop the proposed comparative study, three headlamps were selected, being two of them representatives of the current technologies and the other one is a LEDheadlamp. Some criteria for comparison among their performances had been established and experimental tests were also performed. Finally, this work supplies, synthetically, the main results of the tests, enumerating the advantages and disadvantages of LED-headlamps in comparison with conventional ones. In addition to, it comments the existing barriers for application of this new technology as well.

<p>In Canada, as in the United States, cities seemed to many to be in complete disarray in the 1960s. Growing populations and the resultant increased demands for housing fed rapid suburban sprawl, creating a postwar burst of urban and suburban planning as consultants were hired in city after city to address the challenges of the postwar era. During this period expressway proposals sparked controversy in urban centres across the developed world, including every major city in Canada, namely Vancouver, Edmonton, Winnipeg, Toronto, Montréal and Halifax. Residents objected to postwar autocentric planning designed to encourage and promote the continued growth of city centres. Frustrated by unresponsive politicians and civic officials, citizen activists challenged authorities with an alternate vision for cities that prioritized the safeguarding of the urban environment through the preservation of communities, the prevention of environmental degradation, and the promotion of public transit. As opponents recognized the necessity of moving beyond grassroots activism to established legal and government channels to fight expressways, their protests were buoyed by the rapidly rising costs that plagued the schemes. By the latter half of the 1960s, many politicians and civil servants had joined the objectors. Growing concerns over the many costs of expressways -- financial, social, environmental, and eventually, political -- resulted in the defeat of numerous expressway networks, but most were qualified victories with mixed legacies.</p> <p>Expressway disputes were an instrumental part of a wider struggle to define urban modernity, a struggle that challenged the basis of politicians and civil servants power by questioning their legitimacy as elected leaders and uniquely qualified experts, respectively. The subsequent emergence of urban reform groups that sought to change the direction of city development by challenging the autocratic municipal bureaucracies was the direct legacy of expressway and other development battles. Despite this, autocentric planning continued and demands for greater citizen participation did not result in significant changes to the form and function of municipal governments.</p> / Doctor of Philosophy (PhD)

This economic history and examination of the rubber products manufacturing industry in Peninsular Malaysia contributes to the subject of resource-based industrialization in the field of development studies. The development of the industry is traced from the 1920s to 2005 when the Second Industrial Master Plan came to an end. The findings are that local interests control 80 per cent of the industry, with foreign direct investment in the remaining 20 per cent, either as subsidiary companies of overseas manufacturers or in joint ventures with Malaysian investors. The industry has a dualistic structure, with foreign-owned and joint venture companies typically being more heavily capitalized and employing a larger workforce than wholly Malaysian-owned companies. Foreign and joint venture enterprises are more likely to export a greater volume of production than local firms. Nevertheless, the industry as a whole has a strong export-orientation and Malaysian-based exporters sell into markets worldwide. A detailed examination of the industrial components production sector by means of a questionnaire indicates that Malaysian producers rely on the Malaysian Rubber Board for the transfer of manufacturing technology. Technology transfer in the foreign and joint venture sector is from parent companies and joint venture associates overseas. The conclusion is that the rubber manufacturing industry is vertically integrated with local production of natural rubber used as raw material to produce a range of goods for sale to domestic and international markets. The 80 per cent Malaysian component indicates a stable domestic industry ably supported by local technology resources.

Division One: “Malthus Gets Fat” (Two Chapters) Chapter One develops a simple dynamic model to examine the takeoff from a Malthusian economy to a modern growth regime. It finds that several factors, most notably the rate of technological progress and the economic structure, determine the fastest rate at which the population can grow without declining living standards; this is termed maximum sustainable population growth. It is only when this maximum sustainable rate exceeds the peak rate at which a society expands that takeoff can occur. I also investigate the effects of trade and international income transfers on the ability to sustain takeoff. It is also shown that present income growth is not necessarily indicative of the ability to sustain takeoff and that factors which increase current income growth may actually inhibit takeoff, and vice versa. Chapter Two applies the sustainable population growth framework to Britain during the Industrial Revolution. The model shows a dramatic increase in sustainable population growth at the time of the Industrial Revolution, well before the beginning of modern levels of income growth. The main contributions to the British breakout were technological improvements and structural change away from agricultural production. At least until the middle of the 19th Century, coal, capital and trade played a minor role. Division Two: “Leverage and Financial Market Instability” (Four Chapters) Chapter One develops a model of how leverage induces explosive behavior in financial markets. I show that when levered investors become too large relative to the market as a whole, the demand curve for securities can suddenly become upward-sloping as levered investors are exposed to forced liquidations. The size and leverage of all levered investors defines the minimum elasticity-adjusted market size for stability or MinEAMASS, which is the smallest elasticity-adjusted market size that can support the group of levered investors analyzed. This gives rise to a measure of instability that can predict when markets become vulnerable to a leverage-driven market liquidity crisis. Chapter Two iterates the model of Chapter One forward in time to generate an inflating bubble that suddenly bursts, reproducing many of Kindleberger's (1996) stylized facts about the dynamics of bubbles in a simple framework. Chapter Three applies my measure of instability in a historical investigation of the 1998 demise of hedge fund Long-Term Capital Management (LTCM). I find that a forced liquidation of LTCM threatened to destabilize some financial markets, particularly for bank funding and equity volatility. Chapter Four discusses how the model applied to the stock market crash of 1929. There the evidence suggests that a tightening of margin requirements in the first nine months of 1929 combined with price declines in September and early October caused enough investors to become constrained that the market was tipped into instability, triggering the sudden crash of October and November.

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This dissertation attempts to integrate the household and children more fluidly into measures of well-being in the past. In part one, I develop a Monte Carlo simulation to test some of the assumptions of Allen’s welfare ratio methodology. These included his assumptions that family size was constant over time, that there were no female-headed households and that women and children did not participate in the labour force. After all of the adjustments, it appears that Allen’s welfare ratios underestimate the welfare ratios of a demographically representative group of families, especially if women and children’s labour force participation is included. However, the predicted distributions also highlight the struggles of agricultural labourers, who are given separate consideration. Even the average agricultural labourers’ family with women and children working would have had to rely of self- provisioning, gleaning, poor relief or the extension of the working year to make ends meet at the poorest point in their family life cycle. Part two adjusts Floud et al.’s estimates of calorie availability in the English economy from 1700 to 1909 for the costs of digestion, pregnancy and lactation. Taken together, these three additional costs reduced the amount calories available by around 15 per cent in 1700 but only by 5 per cent in 1909 because of the changing composition of the English diet. Part three presents a new adaptive framework for studying changes in children’s growth patterns over time and a new methodology, longitudinal growth studies, for measuring gender disparities in health in the past. An adaptive framework for understanding growth provides a more parsimonious explanation for the vast catch-up growth achieved by slave children in the antebellum American South. The slave children were only able to achieve this catch-up growth because they were programmed for a tall height trajectory by relatively good conditions in utero. Finally, impoverished girls experienced greater catch-up growth than boys in two schools in late-nineteenth century Boston, USA and early-twentieth century London, suggesting that girls were deprived relative to boys before entering these institutions.

In the last decade, scholars have recognized economic development and modernization as crucial themes in the history of the twentieth century and the ‘global Cold War.’ Yet while historians have written lucid histories of the role of the social sciences in American foreign policy in the Third World, far less is known on the Soviet Union’s ideological and material support during the same period for countries like Egypt, India, Ethiopia, Angola, or – most prominently – Afghanistan. This dissertation argues that the Soviet intervention in Afghanistan is best understood as the final and most costly of a series developmental interventions staged in that country during the latter half of the twentieth century by Afghans, Soviets, Americans, Germans and others. Cold War-era Afghanistan is best understood as a laboratory for ideas about the nation-state and the idea of a ‘national economy.’ One can best understand Afghanistan during that period less through a common but ahistorical ‘graveyard of empires’ narrative, and more in terms of the history of the social sciences, the state system in South and Central Asia, and the ideological changes in ideas about the state and the economy in 20th century economic thought. Four chapters explore this theme, looking at the history of the Soviet social sciences, developmental interventions in Afghanistan prior to 1978, a case study of Soviet advisors in eastern Afghanistan, and Soviet interventions to protect Afghan women. Making use of new materials from Soviet, German, and American archives, and dozens of interviews with former Soviet advisors, this dissertation makes a new and meaningful contribution to the historical literature on the Soviet Union, Central Asia, and international history.