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Dissertations / Theses on the topic 'Alternative fuel sources'

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Published: 4 June 2021
Last updated: 11 February 2022

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1

Kulp, Galen W. "A Comparison of Two Air Compressors for PEM Fuel Cell Systems." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/30840.

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Proton exchange membrane (PEM) fuel cells are considered one of the best potential alternative power sources for automobiles. For this application, high efficiency and high power density are required. Pressurizing the fuel cell system can give higher efficiency, higher power density and better water balance characteristics for the fuel cell, but pressurization uses a percentage of the fuel cell output power. The compressor used to elevate the pressure has a direct effect on the system efficiency and water balance characteristics. A variety of compressors are being developed for fuel cell a
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2

Cherry, Phillip Warren. "A projection of motor fuel tax revenue and analysis of alternative revenue sources in Georgia." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43679.

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Transportation funding is critical to maintaining the assets that provide mobility for the movement of Georgia's people and goods. Currently, most of Georgia's transportation revenue is provided by the motor fuel tax. Inflation and recent increases in fuel economy have decreased fuel tax revenue in Georgia and weakened the Georgia Department of Transportation's (GDOT)'s ability to maintain and expand its transportation network. This thesis synthesizes factors from literature that affect motor fuel tax revenue. These include demographic, economic, technological, and environmental forces t
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3

McHenry, John Carl Izaak. "The Challenges of Biofuels in Ohio: From the Perspective of Small-Scale Producers." Ohio : Ohio University, 2008. http://www.ohiolink.edu/etd/view.cgi?ohiou1197926303.

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4

Attili, Bassam Saleem. "Manufacturer [Sic] of Densified-Refuse Derived Fuel (d-RDF) Pellets and Methods for the Determination of d-RDF Pellet Densities." Thesis, North Texas State University, 1986. https://digital.library.unt.edu/ark:/67531/metadc500977/.

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There are 150 million tons of Municipal Solid Waste (MSW) annually produced in the United States, which is approximately equivalent to 150 million barrels of oil. MSW production is inexhaustible, and is increasing on an annual per capita basis of approximately three per cent. After controlling the moisture and adding a binder, the combustible portion of MSW was converted to pellets. The objects of this project were to 1) evaluate the binder, 2) prepare the pellets, and 3) evaluate the pellets with regard to density. The manufacture of pellets was conducted at the Naval Air Station, Jacksonvill
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5

Carozzi, Helder José Costa. "Utilização de um reator pirolítico retroalimentado (GEET) para melhoria da eficiência de um grupo motor gerador a gasolina." Universidade Estadual do Oeste do Paraná, 2017. http://tede.unioeste.br/handle/tede/3031.

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Submitted by Rosangela Silva (rosangela.silva3@unioeste.br) on 2017-09-05T19:53:11Z No. of bitstreams: 2 Helder José Costa Carozzi.pdf: 3966100 bytes, checksum: 01f620193813ea1dfc556df8dda7178d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Made available in DSpace on 2017-09-05T19:53:11Z (GMT). No. of bitstreams: 2 Helder José Costa Carozzi.pdf: 3966100 bytes, checksum: 01f620193813ea1dfc556df8dda7178d (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-02-22<br>This papers presents a new approach in terms o
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Fuzato, Guilherme Henrique Favaro. "Análise de um conversor boost interleaved com multiplicador de tensão para sistemas de geração distribuída que utilizam células a combustível como fonte primária." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-13102015-152550/.

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Esta dissertação aborda aspectos gerais relativos à utilização de um conversor CC-CC que opera conectado à rede de distribuição e que emprega como fonte primária células a combustível. Neste trabalho, a modelagem matemática em espaços de estados (pequenos sinais e média) dos conversores Boost e Boost Interleaved com Multiplicador de Tensão (IBVM), assim como as arquiteturas de controle utilizadas em modo tensão, corrente média e corrente de pico são comparadas para determinar qual delas apresenta melhor desempenho. Devido ao fato das células a combustível apresentarem tensão terminal baixa e c
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7

Ferrigolo, Fredi Zancan. "Instrumentação para pilhas de células a combustível do tipo PEM visando a eficiência energética." Universidade Federal de Santa Maria, 2009. http://repositorio.ufsm.br/handle/1/8468.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work aims at the development of an instrumentation prototype to monitor, control and drive a proton exchange membrane fuel cell (PEMFC) and its ancillary equipment. The first stage of this work is related to PEMFC stack modeling and the second is focused on electronic instrumentation to obtain practical data regarding to the stack behavior. Several theoretical models are analyzed. However, more attention is paid to the electronic model. Considering other electronic PEMFC models, changes were made to make it a more accurate. In
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8

Rismani-Yazdi, Hamid. "Bioconversion of cellulose into electrical energy in microbial fuel cells." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1211313869.

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9

Lima, Luciano Porto de. "Integração de pilhas de células a combustível com outras fontes alternativas de energia." Universidade Federal de Santa Maria, 2009. http://repositorio.ufsm.br/handle/1/8465.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This dissertation presents a project of a integrated system with distinct energy generating modules using a wind generator, photovoltaic generator, fuel cells stack (FCs) and an accumulator of energy formed by a bank of batteries. This system was implemented in the Center of Studies in Energy and Environment-CEEMA-UFSM. The alternative sources of energy were connected in such a way as to inject current to a common DC bus avoiding so current circulation among sources due to individual voltage differences. The bus voltage is controll
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10

Aftab, Mohammad Adnan. "Biofuel, An alternative source for jet fuel in Aviation." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-34914.

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The transport industry is one of the fastest growing industries with the sector playing a significant role in negative impact on global warming and pollution through the emission of greenhouse gases. Aviation in particular, has enjoyed growth especially in the few decades. New airlines and aircraft manufacturers are coming up with different innovations and technologies to ensure they make the best possible environmentally friendly aircraft. The new main area of focus has been on how to come up with fuel that will reduce the greenhouse gas-emissions. The stakeholders in the same effort include
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11

Ferreira, Andre Augusto. "Sistema supervisorio de gestão de multiplas fontes de suprimento para aplicações em veiculos eletricos." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260860.

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Orientador: Jose Antenor Pomilio<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-09T17:49:15Z (GMT). No. of bitstreams: 1 Ferreira_AndreAugusto_D.pdf: 4648060 bytes, checksum: fec10ea5d77379b209259bd3174d9224 (MD5) Previous issue date: 2007<br>Resumo: Este trabalho propõe uma estratégia de gestão de energia, para aplicações em veículos elétricos, baseado em um sistema supervisório nebuloso que combina três diferentes fontes de suprimento, em termos de densidade de energia e de densidade de potênc
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12

Reis, Ronaldo Matias. "Produtividade e manejo de plantas daninhas no sorgo sacarino cultivado em diferentes arranjos de plantas." Universidade Federal de Viçosa, 2014. http://locus.ufv.br/handle/123456789/4639.

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Made available in DSpace on 2015-03-26T13:40:04Z (GMT). No. of bitstreams: 1 texto completo.pdf: 721867 bytes, checksum: 85d9a5894fb1c5c90727aacafdb3de95 (MD5) Previous issue date: 2014-07-28<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The sweet sorghum can become an important alternative for ethanol production in the sugar cane offseason. For this, adjustments will be necessary in the arrangement of sorghum plants in the field, to use all the available infrastructure and logistics in ethanol plants that use sugar cane as raw material. Besides adjusting the spacing of s
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13

Souza, Marina Moura de. "Propriedades de briquetes e pellets produzidos com resíduos sólidos urbanos." Universidade Federal de Viçosa, 2014. http://locus.ufv.br/handle/123456789/604.

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Made available in DSpace on 2015-03-26T12:27:19Z (GMT). No. of bitstreams: 1 texto completo.pdf: 778013 bytes, checksum: 80573b20b6b26ae5c6d224941a486c2d (MD5) Previous issue date: 2014-06-04<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>This study aimed to investigate different types of materials for the production of compressed biofuel. The selected materials were: tree pruning waste, corrugated cardboard, cartons and sludge of water treatment obtained by flotation technique; these materials were chosen because of its abundance in the urban environment, the ease of fi
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14

Qiu, Jun. "Corporate financial decisions : alternative sources and uses." Thesis, University of Strathclyde, 2015. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=26102.

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15

Sihota, Natasha Julie Jane. "Novel approaches for quantifying source zone natural attenuation of fossil and alternative fuels." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50105.

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Natural attenuation represents an environmentally and economically sustainable means to manage contaminants in situ. To assess potential human and environmental risks associated with this strategy, there is a need to characterize the extent of contaminant containing source zones. Moreover, to obtain public and regulatory support, there is a need to demonstrate that mass losses are occurring. However, quantifying the extent and rate of natural attenuation under field conditions remain challenging. Here a novel approach for assessing and monitoring sites impacted by hydrocarbon and ethanol-blend
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16

Lindgren, Robert. "Gasification of biomass as an alternative enegy source to fuel wood and charcoal - A feasibility study in Malawi." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-114138.

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BERNARDI, JUNIOR PAULO. "Alternativas para a producao de hidrogenio na regioes brasileiras visando a geracao de energia eltrica distribuida." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9460.

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Made available in DSpace on 2014-10-09T12:27:00Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:56:30Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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18

Shandilya, Kaushik K. "Characterization, Speciation, and Source Apportionment of Particles inside and from the Exhaust of Public Transit Buses Fueled With Alternative Fuels." University of Toledo / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1341594452.

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19

Gupta, Kushagra. "Techno-economic analysis of implementing energy-efficiency and alternative fuels in Indonesia using OSeMOSYS." Thesis, KTH, Energiteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280820.

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Indonesia’s energy demand has been growing rapidly driven by increasing population, urbanization, and rapid economic growth. With increasing energy demand, the emissions associated with the energy sector continue to increase. With the gradual increase in demand and dominant share of fossil fuels in the energy mix, implementing the energy efficiency measures is crucial for Indonesia to achieve its energy and climate goals. From the policy perspective, National Energy plan of Indonesia aims to achieve higher levels of energy efficiency to reduce the overall energy intensity. Indonesia also has c
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20

Lovatel, Eduardo Ribeiro. "Produção de hidrogênio através da digestão anaeróbia de glicerol e vinhoto utilizando culturas mistas." reponame:Repositório Institucional da UCS, 2016. https://repositorio.ucs.br/handle/11338/1763.

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O aumento global da utilização de combustíveis tem por consequência maior demanda energética, seja ela renovável ou não. Posto que nossa matriz energética ainda é baseada em combustíveis fosseis, isso significa que há um aumento no impacto ambiental causado pela queima de fontes derivadas de petróleo e carvão. Neste contexto, destaca-se hidrogênio, um gás que pode desempenhar papel significativo na redução das emissões de gases de efeito estufa (GEE) e produção energética limpa, pois a síntese de hidrogênio pode ser realizada a partir de resíduos orgânicos aplicando o processo de digestão anae
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21

Lourenço, Emilene de Carvalho. "Desenvolvimento de método empregando microextração líquido-líquido dispersiva em fase reversa para determinação de Na, K, Ca e Mg em biodiesel." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/2935.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Neste trabalho foi desenvolvido um método empregando a técnica de microextração líquido-líquido dispersiva em fase reversa (RP-DLLME) como preparo de amostra, para extração e pré-concentração de Na, K, Ca e Mg em amostras de biodiesel. A determinação dos analitos foi feita por espectrometria de absorção atômica com chama (F AAS), operando no modo emissão para Na e K e absorção para Ca e Mg. Para executar a etapa de extração/pré-concentração dos analitos empregou-se uma mistura de dois solventes, um dispersor e um extrator,
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22

Santini, Itamar. "Análise de conversores CC-CC com alto ganho de tensão para aplicações com célula a combustível." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-24012017-162247/.

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O presente trabalho aborda a análise e o desenvolvimento de conversores CC-CC com alto ganho de tensão, para aplicações com fontes de energia de baixíssima tensão, porém capazes de fornecer altas correntes, como: painéis fotovoltaicos, células a combustível e baterias. O principal objetivo deste trabalho é elevar a tensão de uma única célula a combustível até um nível adequado de tensão para realizar a carga de uma bateria com tensão nominal de aproximadamente 12 V, de modo eficiente, com baixa ondulação na corrente de entrada do conversor e com baixa ondulação na tensão de saída. Para alcança
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23

Bisoto, Tatiana. "Preparação e caracterização de membranas cerâmicas compostas tubulares para aplicação na separação de gases." reponame:Repositório Institucional da UCS, 2014. https://repositorio.ucs.br/handle/11338/899.

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Este trabalho tem como objetivo preparar membranas compostas de α-alumina recobertas com paládio usando a técnica de deposição química electroless plating associada ao método sol-gel. Foram realizados tratamentos térmicos a 1450°C nos suportes cerâmicos em 6, 12, 18, 24 e 30 h visando verificar a influência do tempo na porosidade do mesmo. Foram preparadas membranas compostas, alumina-Pd com uma, duas e três camadas de paládio na superfície externa do suporte cerâmico, em que o suporte e as membranas foram caracterizados por: análise morfológica realizada por Microscopia Eletrônica de Varredur
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24

Silva, Cristine Brandt da. "Abordagem teórica do processo de geração de biometano a partir de resíduos agroindustriais." Universidade Tecnológica Federal do Paraná, 2017. http://repositorio.utfpr.edu.br/jspui/handle/1/2326.

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Capes; CNPq<br>A geração de energia renovável desafia as empresas a envolver um processo em cadeia, no qual, todos os elos são corresponsáveis pela geração de novos produtos, processos, e pelo consumo e produção responsável, protegendo o meio ambiente e melhorando a vida das pessoas com que mantém interações. A presente pesquisa objetivou propor uma abordagem teórica do processo de geração de biometano a partir de resíduos agroindustriais. Para a realização da abordagem teórica, foi construído um Portfólio Bibliográfico e adotadas técnicas de revisões sistemáticas de literatura, para assegurar
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25

Silva, Cinthia Rubio Urbano da 1982. "Balanço de energia e das emissões de gases de efeito estufa da cadeia produtiva do etanol brasileiro." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263795.

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Orientador: Arnaldo Cesar da Silva Walter<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-14T09:14:27Z (GMT). No. of bitstreams: 1 Silva_CinthiaRubioUrbanoda_M.pdf: 1044299 bytes, checksum: 00aea84fe56180f6398b263bf1ad7fe0 (MD5) Previous issue date: 2009<br>Resumo: A busca por combustíveis que substituam fontes fósseis tem incentivado a produção de biocombustíveis, especialmente para o setor de transporte. O objetivo deste trabalho é fazer os balanços de energia e das emissões de gases de efeito estufa do
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26

Costa, Verlaine Lia. "Programa paranaense de bioenergia: limites e possibilidades da transferência de tecnologia para a cadeia produtiva agrícola." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/2384.

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A presente dissertação objetiva avaliar o processo de pesquisa, inovação e transferência de tecnologia do Programa Paranaense de Bioenergia para a cadeia produtiva agrícola. Para tanto, após a construção de um aporte teórico acerca da definição e contextualização histórica do biodiesel, a descrição da sua cadeia produtiva e do processo produtivo, a abordagem das políticas públicas para a produção de biodiesel, além da abordagem da questão da transferência da tecnologia, bem como a realização de entrevistas com os gestores dos órgãos e institutos executores do Programa do Estado, foi possível a
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27

Pholo, Thapelo. "Design and development of a phosphoric acid fuel cell." Thesis, 2008. http://hdl.handle.net/10352/139.

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Thesis (M. Tech. Engineering: Electrical)--Vaal University of Technology<br>Fuel cells are electrochemical devices that convert chemical energy of a fuel cell into electricity at high efficiency without combustion. They are viewed as viable power sources for many applications including automobiles, distributed power generation and portable electronics. This dissertation presents the design and development of a phosphoric acid fuel cell. It deals with the experimental studies on phosphoric acid fuel cells and possible integration in replacing the conventional sources of electrical energy
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(6643880), Kyle Michael Palmer. "SOURCES OF HEAT REJECTION IN A HDDI DIESEL ENGINE AND METHODS TO IMPROVE THERMAL EFFICIENCY." 2019.

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In the realm of class 8 trucking, fuel economy and emissions compliance are becoming the driving force for development of new heavy-duty direct injected (HDDI) diesel engine technologies. Current production engines in this class convert around 40% of the fuels energy into usable work while the unused potential transfers to the environment as excess heat energy. Current OEMs are working toward decreasing this heat loss and improve engine efficiency and emissions. Quantifying the energy lost by component and system highlights the areas that demand the most attention. By studying test cell data o
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Jansen, van Rensburg Neil. "Technology development of a maximum power point tracker for regenerative fuel cells." Thesis, 2015. http://hdl.handle.net/10352/317.

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M. Tech. (Department of Electronic Engineering, Faculty of Engineering and Technology) --Vaal University of Technology|<br>Global warming is of increasing concern due to several greenhouse gases. The combustion of fossil fuels is the major contributor to the greenhouse effect. To minimalise this effect, alternative energy sources have to be considered. Alternative energy sources should not only be environmentally friendly, but also renewable and/or sustainable. Two such alternative energy sources are hydrogen and solar energy. The regenerative fuel cell, commonly known as a hydrogen generator
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Barnwal, Abhishek. "Combustion Properties of Biologically Sourced Alternative Fuels." Thesis, 2012. http://hdl.handle.net/1807/33332.

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The effects of pressure on various properties of ten different syngas fueled flames were analyzed using one and two dimensional simulations. One-dimensional premixed flames were modeled in CANTERA. Flame speed, adiabatic flame temperature and thermal diffusivity as functions of equivalence ratio and pressure were quantified for the fuels using four chemical kinetic mechanisms. Data from the different mechanisms displayed good agreement with data from previous experimental benchmarks. Two-dimensional axisymmetric co-flow flames were simulated in a state of the art computational framework for mo
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Silva, Tiago João Pereira da 1989. "Utilization of agroindustrial materials as alternative carbon sources for the biodesulfurization of fossil fuels by Gordonia alkanivorans strain 1B." Master's thesis, 2012. http://hdl.handle.net/10451/7954.

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Tese de mestrado. Biologia (Microbiologia Aplicada). Universidade de Lisboa, Faculdade de Ciências, 2012<br>Devido à progressiva industrialização e desenvolvimento global tem-se assistido a um aumento das necessidades energéticas do mundo. Com o crescimento das novas potências económicas as previsões apontam para que esta tendência se acentue, aumentando até 51 % entre 2010 e 2035. A combustão de petróleo e dos seus derivados é a principal fonte de energia a nível mundial, representando 34% do total, por isso não é de admirar que no mesmo período as previsões apontem para que também se verifiq
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Maleta, Chimango. "The case for alternative sources of liquid fuels & petro-chemicals and the development of regional hydrocarbons infrastructure in the SADC, with a focus on Malawi." Thesis, 2016. http://hdl.handle.net/10539/22222.

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Thesis (M.Com. (Development Theory and Policy))--University of the Witwatersrand, Faculty of Commerce, Law and Management, School of Economic and Business Sciences, 2016.<br>Energy security, particularly liquid fuels, is a vital economic goal for both developed and developing nations.As a region, SADC has large coal, oil and gas reserves,and land for potential crop production for biofuels, yet access to liquid fuels is still a major constraint to economic and social development. Some coal is utilised in the region for petrochemical industries, power generation, and for heating. Crude oil r
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Richards, Larissa Christine. "Chemometric analysis of full scan direct mass spectrometry data for the discrimination and source apportionment of atmospheric volatile organic compounds measured from a moving vehicle." Thesis, 2021. http://hdl.handle.net/1828/13333.

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Anthropogenic emissions into the troposphere can impact air quality, leading to poorer health outcomes in the affected areas. Volatile organic compounds (VOCs) are a group of chemical compounds, including some which are toxic, that are precursors in the formation of ground-level ozone and secondary organic aerosols. VOCs have a variety of sources, and the distribution of atmospheric VOCs differs significantly over time and space. Historically, the large number of chemical species present at low concentrations (parts-per-trillion to parts-per-billion by volume) have made VOCs difficult to measu
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