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Dissertations / Theses on the topic 'Energy and power density'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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1

Lyu, Xiaofeng. "High-Power-Density Converter for Renewable Energy Application." Diss., North Dakota State University, 2017. https://hdl.handle.net/10365/26345.

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Due to the energy crisis and environmental pollution, renewable sources are more and more important. Power electronics technology is widely applied in these emerging applications and its function is to make the power conversion. The efficiency of power converters is very important and also the size of power converters is more and more concerned. Therefore, high efficiency and high power density with little power loss and light weight are a trend for power converters. In this research work, light-emitting diode (LED) drivers are first investigated and advanced concaved current control is applie

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2

Briggs, Maxwell H. "Improving Free-Piston Stirling Engine Power Density." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1432660882.

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3

Kang, Byoungwoo. "Designing materials for energy storage with high power and energy density : LiFePO₄ cathode material." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/59707.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, February 2010.<br>"February 2010." Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>LiFePO₄ has drawn a lot of attention as a cathode material in lithium rechargeable batteries because its structural and thermal stability, its inexpensive cost, and environmental friendliness meet the requirements of power sources for electric vehicles, except high power capability. Strategies to increase the rather sluggish rate performance of bulk LiFePO₄ have focused on improvin

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4

Armutlulu, Andac. "Deterministically engineered, high power density energy storage devices enabled by MEMS technologies." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54270.

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This study focuses on the design, fabrication, and characterization of deterministically engineered, three-dimensional architectures to be used as high-performance electrodes in energy storage applications. These high-surface-area architectures are created by the robotically-assisted sequential electrodeposition of structural and sacrificial layers in an alternating fashion, followed by the removal of the sacrificial layers. The primary goal of this study is the incorporation of these highly laminated architectures into the battery electrodes to improve their power density without compromising

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5

Nutter, David B. "Sound Absorption and Sound Power Measurements in Reverberation Chambers Using Energy Density Methods." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1546.pdf.

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6

Patankar, Siddharth. "High-power laser systems for driving and probing high energy density physics experiments." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/23893.

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This thesis describes the construction of a hybrid OPCPA and Nd:Glass based laser system to provide advanced diagnostic capabilities for the MAGPIE pulsed power facility at Imperial College London. The laser system (named Cerberus) is designed to provide one short pulse 500 fs beam for proton probing and two long pulse beams, one for x-ray backlighting and one for Thomson scattering. The aim of this project is to accurately determine plasma parameters in a range of demanding experimental environments. The thesis is split into two sections; the first section provides details about the design an

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7

Dinca, Dragos. "Development of an Integrated High Energy Density Capture and Storage System for Ultrafast Supply/Extended Energy Consumption Applications." Cleveland State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=csu1495115874616384.

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8

Adamson, Jesse Timothy. "Pulse Density Modulated Soft Switching Cycloconverter." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/315.

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Single stage cycloconverters generally incorporate hard switching at turn on and soft switching at turn off. This hard switching at turn on combined with the slow switching speeds of thyristors (the switch of choice for standard cycloconverters) limits their use to lower frequency applications. This thesis explores the analysis and design of a pulse density modulated (PDM), soft switching cycloconverter. Unlike standard cycloconverters, the controller in this converter does not adjust thyristor firing angles. It lets only complete half cycles of the input waveform through to the output. This a

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9

Amin, Mahmoud. "Efficiency and Power Density Improvement of Grid-Connected Hybrid Renewable Energy Systems utilizing High Frequency-Based Power Converters." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/600.

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High efficiency of power converters placed between renewable energy sources and the utility grid is required to maximize the utilization of these sources. Power quality is another aspect that requires large passive elements (inductors, capacitors) to be placed between these sources and the grid. The main objective is to develop higher-level high frequency-based power converter system (HFPCS) that optimizes the use of hybrid renewable power injected into the power grid. The HFPCS provides high efficiency, reduced size of passive components, higher levels of power density realization, lower harm

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10

Signorelli, Riccardo (Riccardo Laurea). "High energy and power density nanotube-enhanced ultracapacitor design, modeling, testing, and predicted performance." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/63027.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 161-164).<br>Today's batteries are penalized by their poor cycleability (limited to few thousand cycles), shelf life, and inability to quickly recharge (limited to tens of minutes). Commercial ultracapacitors are energy storage systems that solve these problems by offering more than one million recharges with little capacitance degradation, recharge times on the order of few seconds, and unlimited

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11

Marquez, Daniel Ryan. "Estimating the Acoustic Power of Sources in Nonideal Enclosures Using Generalized Acoustic Energy Density." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/3977.

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Sound power measurements of acoustic sources are generally made in reverberation or anechoic chambers using acoustic pressure measurements as outlined in specific ISO or other standards. A reverberation chamber produces an approximate diffuse-field condition, wherein the sound power is determined from the spatially averaged squared pressure. An anechoic chamber produces an approximate free-field condition, wherein the sound power is estimated from squared pressure over an enveloping measurement surface. However, in many cases it is desirable to estimate sound power within nonideal semi-reverbe

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12

Patil, Sandeep Kesharsingh. "Modeling and simulations of diphasic composites for development of high energy density dielectrics." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2008. http://scholarsmine.mst.edu/thesis/pdf/Patil_09007dcc804e35ca.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology, 2008.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed April 21, 2008) Includes bibliographical references.

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13

Ihrfors, Charlotte. "Binder-free oxide nanotube electrodes for high energy and power density 3D Li-ion microbatteries." Thesis, Uppsala universitet, Strukturkemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227451.

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This thesis covers synthesis and characterisation of TiO2 nanotubes and TiO2 / Li4Ti5O12 composite nanotubes. The aim was to build batteries with high areal capacity and good rate capability. TiO2 nanotubes were synthesized by two step anodization of titanium metal foil and the composite electrodes were synthesized through electrochemical lithiation of TiO2 nanotubes. To improve the battery performance the TiO2 nanotubes were annealed at 350 °C in air atmosphere, while the composite electrodes were annealed in argon at 550 °C. The longest TiO2 nanotubes were measured to 42.5 μm. The 40 μm long

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14

Wu, Nan. "Capacitive reverse electrodialysis cells for osmotic energy harvesting : Toward real brines and power enhancement." Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLS019.

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Face aux problèmes de réchauffement climatique, trouver des ressources énergétiques propres et durables pour remplacer les combustibles fossiles conventionnels est d'une importance capitale. L'énergie osmotique demeure une ressource énergétique inexploitée avec un potentiel significatif. Dans ce travail, nous parvenons à une conversion efficace de l'énergie osmotique en électricité grâce à un processus de mélange bien contrôlé utilisant un système d'électrodialyse inverse capacitif (CRED). Il est démontré qu'un écart substantiel de densité de puissance existe entre le système CRED et la valeur

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15

Wang, Ruxi. "High Power Density and High Temperature Converter Design for Transportation Applications." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28264.

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The continual development of high-power-density power electronic converters is driven particularly by modern transportation applications like electrical vehicles and more electric aircraft where the space and carrier capability is limited. However, there are several challenges related to transportation applications such as fault tolerance for safety concern, high temperature operation in extreme environments and more strict electromagnetic compatibility requirement. These challenges will increase difficulties for more electrical system adoption in the transportation applications. In this dis

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16

Hoyt, Travis Nathan. "Improvements to Sound Power Measurements for Large, Extended Sources in Semi-Reverberant Rooms Using Generalized Energy Density." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7597.

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Sound power measurements of acoustic sources are typically performed in anechoic or reverberation chambers using acoustic pressure according to international standards. The anechoic chamber creates a free-field environment where the sound power is estimated from the squared pressure integrated over some enveloping surface. The reverberation chamber produces diffuse-field conditions, where sound power is proportional to the spatially averaged squared pressure. In semi-reverberant environments, the direct and reverberant energies each contribute to the total measured field. If the kinetic and po

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17

Breitenbach, Rene. "Development of Free-standing Nanostructured Iron Oxide Electrodes for High Energy and Power Density 3D Li-ion Microbatteries." Thesis, Uppsala universitet, Strukturkemi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-301338.

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18

Zhu, Zhiguang. "Enzymatic fuel cells via synthetic pathway biotransformation." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/51948.

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Enzyme-catalyzed biofuel cells would be a great alternative to current battery technology, as they are clean, safe, and capable of using diverse and abundant renewable biomass with high energy densities, at mild reaction conditions. However, currently, three largest technical challenges for emerging enzymatic fuel cell technologies are incomplete oxidation of most fuels, limited power output, and short lifetime of the cell. Synthetic pathway biotransformation is a technology of assembling a number of enzymes coenzymes for producing low-value biocommodities. In this work, it was applied to gen

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19

Machado, Rogerio Rossi. "Estudo do potencial eólico do pontal do abreu – município de Viamão - RS." reponame:Repositório Institucional da FURG, 2008. http://repositorio.furg.br/handle/1/3489.

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Dissertação(mestrado) - Universidade Federal do Rio Grande, Programa de Pós-Graduação em Engenharia Oceânica, Escola de Engenharia, 2008.<br>Submitted by Lilian M. Silva (lilianmadeirasilva@hotmail.com) on 2013-04-19T22:26:07Z No. of bitstreams: 1 Estudo Do Potencial Eólico Do Pontal Do Abreu – Município De Viamão - RS.pdf: 3173026 bytes, checksum: 65d094e3a89f3d6f6b5c9bd8fe86c064 (MD5)<br>Approved for entry into archive by Bruna Vieira(bruninha_vieira@ibest.com.br) on 2013-06-10T18:14:38Z (GMT) No. of bitstreams: 1 Estudo Do Potencial Eólico Do Pontal Do Abreu – Município De Viamão - RS.pdf:

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20

Rocco, Davide. "Design and impacts of high power density DC-DC converter in automotive powertrain: a methodological approach." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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This thesis work was realized in collaboration with HPE Coxa provider of engineering services and precision manufacturing for automotive, motorsport, automation solution, aerospace and defense sectors. Specifically, this work has been carried out inside the company Control and System Engineering Department. The aim of this work is to describe a methodological approach for the design of an High Density Power DC-DC Converter for high performance electric powertrain and to describe the dependency that exist between system design and performance indicator and which are the consideration that have

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21

Masti, Robert Leo. "The Effect of Anomalous Resistivity on the Electrothermal Instability." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/103737.

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The current driven electrothermal instability (ETI) forms when the material resistivity is temperature dependent, occurring in nearly all Z-pinch-like high energy density platforms. ETI growth for high-mass density materials is predominantly striation form which corresponds to magnetically perpendicular mode growth. The striation form is caused by a resistivity that increases with temperature, which is often the case for high-mass density materials. In contrast, low-density ETI growth is mainly filamentation form, magnetically aligned modes, because the resistivity tends to decrease with tempe

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22

Ma, Xiaohua Ph D. Massachusetts Institute of Technology. "Understanding and designing high power and high energy density cathode materials for lithium ion batteries by experiments and first principles computations." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/101862.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>A new layered compound LiNi2/3Sb1/30 2 was synthesized and tested electrochemically to understand the effect of the transition metals on the structural stability of the layered compound upon Li de-intercalation. The electrochemical results show that the structure of LiNi2/3Sb1 /302 degrades upon cycling. XRD pattern refinement and TEM diffraction on the cycled LiNi2/3 Sb1/3O2 indicate that the structure

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23

Pereira, Rosana Aparecida. "Avaliação da microdureza de resina composta polimerizada com fontes de luz halógena e LED, em função da densidade de energia luminosa irradiada." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/25/25131/tde-22102009-103040/.

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No presente estudo, avaliou-se a microdureza da resina composta Z250 (3M ESPE), quando ativada em diferentes tempos (s), diferentes densidades de potência (mW/cm²), em relação à quantidade de energia irradiada (8, 12 e 16 J/cm²), com a finalidade de estabelecer uma densidade de energia luminosa mínima capaz de polimerizar adequadamente os compósitos. Foi utilizado um aparelho com fonte de luz halógena Degulux-Degussa, com 600 mW/cm² e dois aparelhos de fonte de luz LED, Ultraled XP (Dabi-Atlante) com 150 mW/cm² e LED Ultrablue-IS (DMC) com 300 mW/cm² e 600 mW/cm². Duas matrizes bipartidas de

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24

Shaheen, Mohammed Mahmoud Zaki Mohammed. "Design and Assessment of Vertical Axis Wind Turbine Farms." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439306478.

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25

Natarajan, Hariharan. "Post occupancy energy analysis of the Gwinnett Environmental and Heritage Center." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41214.

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26

Fogleman, Myles. "Cold X-ray Effects on Satellite Solar Panels in Orbit." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/6065.

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An exo-atmospheric nuclear detonation releases up to 80 percent of its’ energy as X-rays. Satellite’s solar cells and their protective coatings are vulnerable to low energy X-ray radiation. Cold X-rays (~1-1.5 keV) are absorbed close to the surface of materials causing the blow-off and rapid formation of Warm Dense Plasmas (WDPs), particularly in a gap between the unshielded active elements of solar cells. To understand how WDPs are created, it is necessary to investigate the power density distribution produced by cold X-rays for typical solar panel surface materials. The Monte Carlo stepping

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27

Hlongwa, Ntuthuko Wonderboy. "Thermochemical Storage and Lithium Ion Capacitors Efficiency of Manganese-Graphene Framework." University of the Western Cape, 2018. http://hdl.handle.net/11394/6458.

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Philosophiae Doctor - PhD (Chemistry)<br>Lithium ion capacitors are new and promising class of energy storage devices formed from a combination of lithium-ion battery electrode materials with those of supercapacitors. They exhibit better electrochemical properties in terms of energy and power densities than the above mentioned storage systems. In this work, lithium manganese oxide spinel (LiMn2O4; LMO) and lithium manganese phosphate (LiMnPO4; LMP) as well as their respective nickel-doped graphenised derivatives (G-LMNO and G-LMNP) were synthesized and each cathode material used to fabricate l

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28

Jensen, Zachary R. "Improvements to the Two-Point In Situ Method for Measurement of the Room Constant and Sound Power in Semi-Reverberant Rooms." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/5724.

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The two-point in situ method is a technique for measuring the room constant of a semi-reverberant room and the sound power of a source in that room simultaneously using two measurement positions. Using a reference directivity source, where the directivity factor along any given axis of the source has been measured, one is able to use the Hopkins-Stryker equation to measure both the room constant and the sound power level of another source rather simply. Using both numerical and experimental data, it was found that by using generalized energy density (GED) as a measurement quantity, the resul

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PEREIRA, SERGIO A. "Conceito alternativo de um reator hibrido (conjunto sub-critico acoplado com acelerador)." reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10991.

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Made available in DSpace on 2014-10-09T12:46:36Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:56:41Z (GMT). No. of bitstreams: 1 08350.pdf: 7511291 bytes, checksum: 18b3142f54961c0556b2d92490449a3a (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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Ji, Xiaoyan. "Thermodynamic properties of humid air and their application in advanced power generation cycles." Doctoral thesis, Stockholm : Department of Chemical and Engineering and Technology, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4129.

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31

Youard, Timothy John. "Feasibility of an Electric Jetpack." Thesis, University of Canterbury. Electrical and Computer Engineering, 2010. http://hdl.handle.net/10092/5293.

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The Martin Aircraft Company Limited has been developing the Martin Jetpack for over 25 years. The recent worldwide launch of the Jetpack has enabled the company to step up its research and development programme. The goal of this project was to determine the feasibility of an electrically powered version of the Martin Jetpack. The feasibility of the Electric Jetpack was determined by researching energy storage technologies, researching power cable technologies, simulations of flight times, surveys of electric motors, and the development of a simulation program which was used to optimise some

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32

RAFIQUE, AMJID. "Flexible Fiber-Shaped Supercapacitor for Wearable Electronics." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2729354.

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33

Metchueng, Kamdem Syntia. "Stockage de chaleur dans l'habitat par sorption zéolite/H2O." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI059/document.

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Le couple zéolite/H2O, qui présente une densité énergétique importante et remplit les conditions d’innocuité requises pour un système de stockage de chaleur pour l’habitat, est mis en œuvre dans réacteur modulaire à lit fixe. Un modèle monodimensionnel de transferts couplés de masse et de chaleur dans un lit fixe de grains de zéolite parcourus par un flux d'air humide été élaboré. Ce dernier a été conçu de façon à pouvoir intégrer rapidement des données sur de nouvelles générations de matériaux et coupler le réacteur à d’autres modèles : bâtiment/sous-station/quartier. L'étape de validation ex

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34

Chester, Ryan T. "Error Sensor Strategies for Active Noise Control and Active Acoustic Equalization in a Free Field." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2298.pdf.

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35

Ayme, Fabien. "Développement d'une méthode énergétique pour l'évaluation expérimentale des flux acoustiques entrants dans les cavités d'avion." Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00995861.

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La hiérarchisation de la puissance injectée par des sources acoustiques dans une cavité d'avion telle qu'un cockpit, en vol, revêt un caractère majeur dans le but d'en réduire le bruit intérieur. Afin de répondre à ce besoin, la nécessité de considérer la cavité dans son ensemble à l'aide d'une méthode globale se révèle importante. Au cours de cette thèse, une méthode d'identification basée sur une méthode énergétique locale, appelée MES pour Méthode Energétique Simplifiée, est utilisée. En connaissant la géométrie de la cavité, ainsi que l'absorption des matériaux qui la composent, elle perme

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Novell, Sara T. "Design of Structural Stand for High-Precision Optics Microscopy." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2132.

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Lawrence Livermore National Lab (LLNL) is home to the National Ignition Facility (NIF), the world’s largest and most energetic laser. Each of the 192 beamlines contains dozens of large optics, which require offline damage inspection using large, raster-scanning microscopes. The primary microscope used to measure and characterize the optical damage sites has a precision level of 1 µm. Mounted in a class 100 clean room with a raised tile floor, the microscope is supported by a steel stand that structurally connects the microscope to the concrete ground. Due to ambient vibrations experienced in t

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Toni, Kotchikpa Arnaud. "Conception et intégration d'un convertisseur buck en technologie 28 nm CMOS orientée plateformes mobiles." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI049.

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Ce travail de thèse présente la conception d’un convertisseur Buck 3 états pour améliorer le comportement dynamique des tensions d’alimentations des microprocesseurs. La topologie du convertisseur est dans un premier temps, implémentée en technologie IBM CMOS 180 nm pour la validation de la structure 3 états. Le prototype réalisé utilise une tension d’entrée de 3.6V et génère une tension de sortie de 0.8V à 2V. Sa réponse aux transitoires de charge ne montre que 1 à 2% de surtension prouvant ainsi l’avantage du régulateur en dynamique. Le convertisseur 3 états est dans un deuxième temps intégr

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Kirichenko, E., and E. Belovol. "High-energy-density sugar biobattery." Thesis, Sumy State University, 2014. http://essuir.sumdu.edu.ua/handle/123456789/45213.

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The rapidly growing demand for powering portable electronic devices is driving the development of better batteries with features such as enhanced energy-storage densities, high levels of safety, biodegradability and small environmental footprints. The lithium-ion battery is often the system of choice because it offers a high energy density, has a flexible and light-weight design and has a longer lifespan than comparable battery technologies. The widespread use of metal-catalysed batteries also raises many concerns, primarily related to safety, toxic metal pollution and the availability of cos

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Bouchaala, Dhouha. "Investigation of Current Excitation for Personal Health and Biological Tissues Monitoring." Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-204801.

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Bioimpedance spectroscopy is very useful in biomedical field as a safe and non-invasive technique. A stable and safe excitation current below than 0.5 mA for load impedances changing from 100 Ω to 10 kΩ in the full β-dispersion range from kHz up to 1 MHz is a big challenge for the design of the current source addressed by this thesis. For a good stability and high accuracy, the source should have a high output impedance. Different current source types in “current-mode approach” and “voltage-mode approach” were investigated and compared for usability in bioimpedance measurement systems. The “vo

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Erices, Muñoz Eduardo Andrés, and Rojas Cristian Patricio Torres. "Sun Power Energy." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/137206.

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Tesis para optar al grado de Magíster en Administración<br>Eduardo Andres Erices Muñoz [Parte I Análisis estratégico y de mercado], Cristian Patricio Torres Rojas [Parte II Análisis organizativo-financiero]<br>Autores no autorizan el acceso a texto completo de su documento<br>La necesidad de aumentar la capacidad instalada de la matriz energética del país es un tema que en la última década se ha instalado en la agenda nacional, dado que el crecimiento económico de Chile implica un mayor consumo eléctrico. A su vez, la estrechez energética se ve representada con mayor profundidad en la industri

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Kim, Hyea. "High energy density direct methanol fuel cells." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37106.

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The goal of this dissertation was to create a new class of DMFC targeted at high energy density and low loss for small electronic devices. In order for the DMFC to efficiently use all its fuel, with a minimum of balance of plant, a low-loss proton exchange membrane was required. Moderate conductivity and ultra low methanol permeability were needed. Fuel loss is the dominant loss mechanism for low power systems. By replacing the polymer membrane with an inorganic glass membrane, the methanol permeability was reduced, leading to low fuel loss. In order to achieve steady state performance, a comp

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Khorashad, Arash Sorouri. "Investigation of the exchange energy density functional." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504765.

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Density Functional Theory (DFT) is an important tool in the treatment of quantum many-body problems. In spite of being exact in principle, the application of DFT requires the use of approximations, because it involves an unknown universal functional called the exchange-correlation energy. In this thesis we describe an accurate and efficient extension of Chawla and Voth's planewave based algorithm for calculating exchange energies, exchange energy densities, and exchange energy gradients with respect to wave function parameters in systems of electrons subject to periodic boundary conditions. Th

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Olsson, Robbie Stefan Ian. "High energy density physics in cluster media." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/18394.

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Gases comprised of atomic clusters have in the past been shown to exhibit extremely strong absorption of high-intensity laser pulses. By using this target medium, it is possible to use laser systems with only modest energies to create High Energy Density Plasmas. Not only are the plasmas created in this way of interest in themselves, but when properly designed, these experiments can be used as a platform for Laboratory Astrophysics studies of radiative blast waves. This thesis describes experiments which investigate the evolution of radiative blast waves, the interaction of relativistic laser

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Xu, Buye. "Generalized Acoustic Energy Density and Its Applications." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2339.

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The properties of acoustic kinetic energy density and total energy density of sound fields in lightly damped enclosures have been explored thoroughly in the literature. Their increased spatial uniformity makes them more favorable measurement quantities for various applications than acoustic potential energy density (or squared pressure), which is most often used. In this dissertation, a new acoustic energy quantity, the generalized acoustic energy density (GED), will be introduced. It is defined by introducing weighting factors, α and 1 − α, in the formulation of total acoustic energy density.

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Shin, Il-Won. "POWER SPECTRAL DENSITY ANALYSIS OF PRINTER DEFECT." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/266.

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A potential characterization tool for printer quality is the power spectral density (PSD) analysis of flat-field printer outputs. This thesis explains the relationship between the PSD and characteristics of printer defects using examples of scanned printer outputs. In addition, a protocol is also presented for scanning flat fields and performing a PSD analysis. The protocol considers sampling and windowing issues to best focus on defects or quality issues of interest. The main objective of this work is to determine the interactive relationships of print defect patterns such as graininess, stre

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Chen, Zheng. "Electrical Integration of SiC Power Devices for High-Power-Density Applications." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23923.

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The trend of electrification in transportation applications has led to the fast development of high-power-density power electronics converters. High-switching-frequency and high-temperature operations are the two key factors towards this target. Both requirements, however, are challenging the fundamental limit of silicon (Si) based devices. The emerging wide-bandgap, silicon carbide (SiC) power devices have become the promising solution to meet these requirements. With these advanced devices, the technology barrier has now moved to the compatible integration technology that can make the best o

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Nikonov, M. "Energy resources: wave power." Thesis, Sumy State University, 2017. http://essuir.sumdu.edu.ua/handle/123456789/62834.

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The topic of renewable energy is an evergreen subject, especially, in a world dominated by fossil fuels. Renewable energy is widely discussed in the contemporary world because it is unlimited, which means it’s sustainable and does not emit greenhouse gasses that are harmful to the environment and human life. A classic example of renewable energy is wave energy.

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馮錦生 and Kam-sang Fung. "Fatigue crack propagation with strain energy density approach." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31209713.

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Chung, Kang Ko. "Heteroatom-containing carbons for high energy density supercapacitor." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2014/6982/.

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The supercapacitor is one of the most important energy storage devices as its construction allows for addressing many of the drawbacks related to batteries, but the low energy density of current systems is a major issue. In this doctoral dissertation, with a view to attaining high energy density supercapacitor systems that can be comparable to those for batteries, new heteroatom-containing carbons in the form of particles and three-dimensional films were investigated. A nitrogen-containing material, acrodam, was chosen as the carbon precursor due to the inexpensiveness, high carbonization yiel

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Guillaud, Mathilde. "Neutrino oscillations at very high energy/matter density." Thesis, KTH, Fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292510.

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Neutrino oscillations in matter can be studied in different regimes, depending on the energy of the incoming neutrinos and the matter density of the medium. In this thesis we investigate neutrino oscillations in dense matter at very high energy (TeV-PeV range), taking into account the absorption that the neutrinos may undergo in such dense media. This absorption phenomenon is relevant for neutrino telescope measurements of astrophysical neutrinos. We begin with a brief reminder on neutrino oscillations in vacuum and the construction of the PMNS matrix. Then, we proceed with calculations for de

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