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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
81

Head augmentation in hydraulic turbines by means of draft tube ejectors

Siegel, Robert P. January 1982 (has links)
The use of draft tubes with annular injection was investigated with respect to low-head applications. A numerical model was developed and refined to fit the data from two laboratory test models. The latter model was a laboratory scale hydropower system which demonstrated 20-31 per cent head augmentation under various conditions. The numerical model was used to generate performance maps of full scale, low-head systems in the range from 200 to 500 kW. The performance maps were then used in a system modeling program to evaluate the system performance, cost and cavitation characteristics. The draft tube ejector system was found to reduce the system cost/kW by 2-10 per cent when compared to a conventional system with the same gross head and total flow rate. This was accomplished by using smaller, less expensive turbines which utilize excess flow in draft tube ejectors to increase the effective head across the turbine. The resulting reduction in system cost was found to exceed the corresponding reduction in capacity. The use of draft tube ejectors was found to require slightly lower turbine settings due to increased cavitation risk. / Master of Science
82

Crossing Borders: The Toronto Anti-Draft Programme and the Canadian Anti-Vietnam War Movement

Roth, Matthew McKenzie Bryant Roth January 2008 (has links)
This study examines how the Toronto Anti-Draft Programme (TADP) assisted American war resisters who came to Canada in response to the Vietnam War. It illustrates how the TADP responded to political decisions in Canada and in the United States and adapted its strategies to meet the changing needs of war resisters who fled to Canada. The main sources of material used for this research were the TADP’s archival records, newspaper accounts and secondary literature. This study traces the organization’s origins in the Canadian New Left before looking at how TADP released the Manual for Draft-Age Immigrants to Canada; a document that advised war resisters on how to successfully prepare for immigration. It will also explore how TADP provided immigration counselling, employment, housing services and emotional support to American war resisters. Some of the organization’s principal actors and its relationship with other Canadian aid organizations are also examined. As the number of draft resisters coming to Canada decreased during the war, the number of military resisters entering the country increased. This shift led to a change in the type of counselling the TADP provided, a reorientation that is also discussed here. As well, the unexpected numbers of African-Americans and women resisters who crossed the border presented a unique set of challenges to the TADP. Finally, this thesis examines the TADP’s attempts to aid American war resisters in Sweden, spread the word about the Canadian government’s liberalized immigration regulations in 1973, and address the issue of amnesty for resisters in America.
83

Crossing Borders: The Toronto Anti-Draft Programme and the Canadian Anti-Vietnam War Movement

Roth, Matthew McKenzie Bryant Roth January 2008 (has links)
This study examines how the Toronto Anti-Draft Programme (TADP) assisted American war resisters who came to Canada in response to the Vietnam War. It illustrates how the TADP responded to political decisions in Canada and in the United States and adapted its strategies to meet the changing needs of war resisters who fled to Canada. The main sources of material used for this research were the TADP’s archival records, newspaper accounts and secondary literature. This study traces the organization’s origins in the Canadian New Left before looking at how TADP released the Manual for Draft-Age Immigrants to Canada; a document that advised war resisters on how to successfully prepare for immigration. It will also explore how TADP provided immigration counselling, employment, housing services and emotional support to American war resisters. Some of the organization’s principal actors and its relationship with other Canadian aid organizations are also examined. As the number of draft resisters coming to Canada decreased during the war, the number of military resisters entering the country increased. This shift led to a change in the type of counselling the TADP provided, a reorientation that is also discussed here. As well, the unexpected numbers of African-Americans and women resisters who crossed the border presented a unique set of challenges to the TADP. Finally, this thesis examines the TADP’s attempts to aid American war resisters in Sweden, spread the word about the Canadian government’s liberalized immigration regulations in 1973, and address the issue of amnesty for resisters in America.
84

The Impact Of Sensitive Science & Technology Control Mechanism Against The Competitive Advantages of Taiwan Semiconductor Industry.

Wu, Hsueh-Fung 10 July 2006 (has links)
The 8-inch wafer Fab. landing China or not evoked highly concerned in the worldwide, and even evoked the misdoubt if Taiwan clash with Wassenar Agreements . On New Year¡¦s Day, President Chen Shei-Ben reiterated the Policy of Economy and Trade across the Taiwan Straits, ¡§Proactive liberalization with effective management¡¨, which also evoked controversy in the worldwide. While UMC (United Microelectronic Corporation) ¡¥s He-Jan investment was been debating hotly, we considered if it also had great effect of production race between Taiwan and China, besides business benefits. Moreover, we considered if it resulted in the technology illegal landing, and conflicted with Wassenar Agreements, by avoiding to threaten the national security. If Taiwan was a launching pad of America high tech to China, it would cause other high techs importing forbiddance from America. Because of that, Taiwan gets more a loss than gains. Suppose ¡§Economic globalization¡¨ is the lifeblood of Taiwan; The semiconductor industry is not only holding on the advantages of past , but also trying to approach to the market. Furthermore, it should create production competitiveness. The government should follow the market rules, develop the reciprocal relationship with business and reach the goal of looking after both sides, economic developing and national security. In this study, it expects to discuss the influence of The Sensitive Scientific Technology Draft Bill legislation of funding, technology, equipment, brain-import abridged in semiconductor production in Taiwan to the competitive advantage of production; (1) Understanding the status and meaning of The Sensitive Scientific Technology Draft Bill in Taiwan. (2) Does tech-import controlling of The Sensitive Scientific Technology Draft Bill in Taiwan has connecting to international relative laws? (3) Analyzing the impact of the protect mechanism of The Sensitive Scientific Technology Draft Bill to competitive advantage of semiconductor industry. The first study step is to comparing analyze the aims, effects, targets of international relative laws by documents study, especially according to the international relative laws of high-tech import controlling, for example, the administration rules and complement actions of COCOM and Wassenar Agreements, for understanding the reasonable and objective of The Scientific Technology Draft Bill (The Sensitive Scientific Technology Draft Bill). Moreover, base on profound interview with business to processing the situational analysis of business, production, people, society, government and the national security. This study conclusion and the suggestions from business experience can offer the reference resources for lawmaking and revising.
85

Konvergence US GAAP a IFRS v oblasti vykazování operatívního leasingu na straně pronajímatele

Pašáková, Nikola January 2015 (has links)
Pašáková, N. Convergence of US GAAP and IFRS in the reporting of operating lease on the side of lessor. Diploma thesis. Brno: Mendel university in Brno, 2014. The diploma thesis is focused on the evaluation of potential impacts of the proposed change in the operating lease in accordance with international ac-counting standards compared with the currently applicable standard from the point of view of the lessor. The thesis is divided into two sections: theoretical and practical. The theoretical section deals with the analysis of the current ap-plicable standard IAS 17 and proposed procedures exposure draft ED/2010/9 and re-exposure draft ED/2013/6. The practical section shows the impact on the statements of the lessor and the indicators of financial analysis.
86

Public Opinion of Conscription in the Federal Republic of Germany, 1954-1956

Donnelly, Jared 05 1900 (has links)
In 1955, barely ten years after the end of the most devastating war in Modern German history, a new German military was established in the Federal Republic, the Bundeswehr. In order properly fill the ranks of this new military the government, under the leadership of Konrad Adenauer, believed that it would have to draft men from the West German population into military service. For the government in Bonn conscription was a double-edged sword, it would not only ensure that the Bundeswehr would receive the required number of recruits but it was also believed that conscription would guarantee that the Bundeswehr would be more democratic and therefore in tune with the policies of the new West German state. What this study seeks to explore is what the West German population thought of conscription. It will investigate who was for or against the draft and seek to determine the various socioeconomic factors that contributed to these decisions. Furthermore this study will examine the effect that the public opinion had on federal policy.
87

Entering Nam: A Comparative Study Of The Entrance Experiences Of Volunteer And Drafted Service Members Into The Military During The Vietnam War

Wilt, Ashley 01 January 2012 (has links)
Many historians have conducted oral history interviews with Vietnam War veterans in an attempt to offer a more personal perspective to the study of the Vietnam War; however, most historians do not consciously differentiate between drafted and volunteer veterans. Identifying whether a veteran was drafted into service or volunteered is critical because the extent to which this service was voluntary or coerced may affect the way a veteran remembers his military service. By conducting oral histories, one can consciously delineate service members who volunteered as opposed to those who were drafted to determine if the veterans‟ experiences change based on the nature of their entry into the military. Additionally, examining the implementation of a national draft and its effects on service members‟ experiences will offer a better understanding of American military history. While much of the attention of scholars has been on drafted soldiers in Vietnam, little research has been conducted on the experience of the volunteer soldier. This study relies on oral history interviews conducted with volunteer and drafted service members of the Vietnam War to determine if there were differences between draftees and volunteers based on their entrance into the military. The research and oral history interviews with the two veteran groups establishes that the dissent detailed by draft protesters was not always the case and service members, volunteers and draftees alike, more often than not accepted their military service. The interviewed veterans‟ responses suggest that resistance to military service during the Vietnam War may not have been as great as one might think given the attention that has been placed on the anti-draft movement.
88

A critical evaluation and refinement of the performance prediction of wet-cooling towers

Kloppers, Johannes Christiaan 12 1900 (has links)
Thesis (PhD (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2003. / The thermal performance prediction of wet-cooling towers is critically analyzed and refined. Natural draft counterflow towers and mechanical draft counterflow and crossflow towers are considered. The Merkel, Poppe and e-NTU heat and mass transfer methods of analysis are derived from first principles, as these methods form the cornerstone of wet-cooling tower performance evaluation. The critical differences between these methods, when applied to fill performance analyses and cooling tower performance evaluations, are highlighted. The reasons for these differences are discussed with the aid of psychrometric charts. A new extended empirical relation for the loss coefficient of fills is proposed where the viscous and form drag effects are accounted for as well as the buoyancy, momentum and fill height effects. The empirical equation for the transfer characteristic of fills is extended to include the effects of fill height and the inlet water temperature. Empirical equations to predict the temperature inversion profile, height of the temperature inversion and the height from which air is drawn into the cooling tower are developed. The influence of temperature and humidity inversions on the performance of wet-cooling towers is subsequently investigated. A comprehensive analytical computer program is developed to predict and optimize the performance of wet-cooling towers. Computer programs are also developed to generate cooling tower performance curves, analyze fill performance test data and plot psychrometric charts.
89

Estudo da remoção de sulfato em biorreator operado em batelada e batelada alimentada seqüenciais, contendo biomassa imobilizada e utilizando agitação mecânica e \"draft-tube\" / Study on sulfate removal in an anaerobic sequencing batch reactor containing immobilized biomass, and utilizing mechanical agitation and \"draft-tube\"

Friedl, Gregor Franz 26 March 2008 (has links)
Um reator anaeróbio tratando esgoto sintético de baixa concentração de matéria orgânica (500 mgDQO/L-1) e enriquecido com diferentes concentrações de sulfato (razões DQO/[SO4-2] de 1,34, 0,67 e 0,34) foi submetido à diferentes estratégias de alimentação (batelada e batelada alimentada de 3 h e de 6 h). O reator operou com capacidade de 4,0 L e tratou por ciclo de 8 h um volume de 2,0 L de esgoto sintético. Desta forma, executaram-se 9 condições diferentes que foram submetidas à análise com o objetivo de investigar a influência do tempo de alimentação e da razão DQO/[SO4-2] no desempenho do sistema. A temperatura do reator foi constante em 30 ± 1°C e a agitação mecânica foi fixada em 400 rpm. Como suporte para a imobilização da biomassa foram utilizados cubos de espuma de poliuretano. Os resultados obtidos demonstraram que a operação em batelada alimentada de 3 h com uma razão DQO/[SO4-2] de 0,34 apresentou as melhores condições para a remoção de matéria orgânica (89%). Quanto à remoção de sulfato observou-se uma estagnação neste mesmo modo de operação ao aumentar a concentração de sulfato no afluente, enquanto que na operação com alimentação em batelada alimentada de 6 h, a carga de sulfato removida (CSR) cresceu linearmente. Assim, a maior carga de sulfato removida foi registrada durante o ensaio em batelada alimentada de 6 h com uma razão DQO/[SO4-2] de 0,34, no qual foram removidos 0,55 g SO4-2(L.d). Com uma razão DQO/[SO4-2] de 1,34 e um tempo de enchimento de 6 h, o reator apresentou o melhor desempenho em termos de eficiência de remoção de sulfato (71%). Em todos os ensaios o reator apresentou estabilidade, com uma produção alta de alcalinidade a bicarbonato e a concentração de ácidos voláteis se manteve em níveis adequados. / An anaerobic sequencing batch reactor treating synthetic low strength wastewater (500 mgCOD/L-1) enriched with different sulfate concentrations (COD/[SO42] ratios of 1,34, 0,67 and 0,34) was operated at different fill times (batch mode and sequencing batch mode of 3 h and 6 h fill time). The reactor operated with a capacity of 4,0 L and treated per 8-h cycle 2,0 L of synthetic wastewater. Thus, 9 different configurations resulted from this configuration and were submitted under analyses with the objective to investigate the influence of each of those parameters on the performance of the system. The reactor was operated at a constant temperature of 30 ± 1°C and an mechanical agitation rate of 400 rpm. Cubic particles of polyurethane were used as support material for anaerobic biomass immobilization. The results showed that operating the reactor with a fill time of 3 h and a COD/[4-2] ratio of 0,34 was the most eficient strategy for COD removal (89%). During the same operation mode (3 h fill time) sulfate removal seemed to suffer stagnation due to the increasing sulfite concentation in the reactor, whereas with a fill time of 6 h the sulfate load removal increased linerally with increasing sulfate load. So the biggest removal, in terms of volumetric sulfate load, was obtained operating the reactor in sequencing batch mode with a fill time of 6 h and a COD/[4-2] ratio of 0,34. During this test the reactor removed 0,55 gSO4-2/(L.d) of 2,29 gSO4-2/(L.d) applied on the system. Operating at a COD/[SO4-2] ratio of 1,34 and a fill time of 6 h the reactor obtained the best results in terms of sulfate removal efficiency, with 71% of the sulfate removed from the system. In the entire period of analisis the reactor showed stability with a suficient production of alkalinity to maintain the concentration of volatil acids in adequate levels.
90

Redução de sulfato em biorreator operado em batelada e batelada alimentada seqüenciais contendo biomassa granulada com agitação mecânica e Draft-Tube / Sulfate reduction in bioreactor in sequencing batch and fed-batch containing granulated biomass with mechanical stirring and draft-tube

Mockaitis, Gustavo 26 March 2008 (has links)
O presente projeto avaliou um reator anaeróbio operado em batelada e batelada alimentada seqüenciais (ASBR), em ciclos de 8 horas, utilizando biomassa granulada e agitação mecânica em um draft-tube, alimentado com água residuária sintética (500 mgDQO/L), contendo sulfato em diferentes relações DQO/[\'SO IND.4\' POT.2-\']. Em todos os ensaios o reator apresentou uma operação estável, produzindo alcalinidade e com concentração de ácidos voláteis totais em níveis adequados. Para os tempos de alimentação de 10 min, 3 h e 6 h, respectivamente, as eficiências de remoção de sulfato foram de 30, 72 e 72% nas operações nas quais o reator foi alimentado com uma relação DQO/[\'SO IND.4\'POT.2-\'] de 1,34. Nos ensaios nos quais o reator foi alimentado na relação DQO/[\'SO IND.4\'POT. 2-\'] de 0,67, as eficiências para a redução de sulfato foram de 25, 58 e 55%, respectivamente. Na operação com relação DQO/[\'SO IND.4\'POT.2-\'] de 0,34, as eficiências para redução de sulfato foram de 23, 37 e 27%, respectivamente. Desta maneira, pode-se concluir que as operações em batelada alimentada favoreceram a remoção de sulfato, enquanto foi observado que nas operações em batelada a remoção de matéria orgânica atingiu melhores eficiências. / This present work evaluate an anaerobic sequencing batch reactor (ASBR), fed in batch and fed-batch, and cycles of 8 hours, using granulated biomass and mechanical stirring in a draft-tube, fed with synthetic wastewater (500 mgCOD/L), enriched with sulfate in some COD/[\'SO IND.4\'POT.2-\'] relations. In all operations the reactor showed a stable operation, producing alkalinity and maintaining the volatile acids in adequate levels. Considering the fed periods of 10 min, 3 h and 6 h, respectively, the removal efficiencies of the sulfate was 30, 72 e 72%, in the operations when the reactor was fed with a COD/[\'SO IND.4\'POT.2-\'] relation of 1,34. In the essays when the reactor was fed in COD/[\'SO IND.4\'POT.2-\'] relation of 0,67, the efficiencies of the sulfate reduction was 25, 58 e 55%, respectively. When the reactor was operated with COD/[\'SO IND.4\'POT.2-\'] relation of 0,34, the efficiencies of sulfate reduction 23, 37 e 27%, respectively. Thus, is possible to conclude that the operations in fed-batch increased the efficiency of sulfate removal, at what time was observed that in batch operations the organic matter removal attained improved efficiencies.

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