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Dissertations / Theses on the topic 'Ion engines'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Starling, Dan A. "Propellant feed control for ion engines." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA316748.

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2

Starling, Dan A. Jr. "Propellant feed control for ion engines." Thesis, Monterey, California. Naval Postgraduate School, 1996. http://hdl.handle.net/10945/8868.

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Approved for public release, distribution is unlimited<br>An overview of space electric propulsion (SEP) is presented. Methods of throttling the power levels of electrostatic and electromagnetic thrusters are discussed. Particular attention is given to the concept of thermally- throttling propellant flow using the temperature-viscosity characteristics of xenon gas. The thermoproperties of xenon gas as a function of temperature are determined, and the flow regimes of the propellant at the mass flow rates of interest are studied. The propellant flow is presented separately as Fanno flow and as R

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3

Gruber, J. R. "A study of erosion due to low-energy sputtering in the discharge chamber of the Kaufman ion thruster." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249396.

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4

Panousakis, Dimosthenis. "Ion current sensing for controlled auto ignition in internal combustion engines." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/8145.

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Envirom-nental pollution is a subject that needs urgent addressing. Since the internal combustion engine has its fair share of accountability on this, research on techniques for increasing engine efficiency and emissions is necessary. Controlled Auto Ignition is a promising combustion mode, which increases fuel efficiency while also reducing NOx emissions to negligible levels. This Thesis concentrates on the implementation of this mode through experimental research, on an engine equipped with a fully variable valvetrain. Investigation of the operational window, emissions, fuel consumption, the

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5

Holub, Anna, and Jie Liu. "Recognizing Combustion Variability for Control of Gasoline Engine Exhaust Gas Recirculation using Information from the Ion Current." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-235.

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<p>The ion current measured from the spark plug in a spark ignited combustion engine is used </p><p>as basis for analysis and control of the combustion variability caused by exhaust gas </p><p>recirculation. Methods for extraction of in-cylinder pressure information from the ion </p><p>current are analyzed in terms of reliability and processing efficiency. A model for the </p><p>recognition of combustion variability using this information is selected and tested on both </p><p>simulated and car data.</p>

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6

Ogunjobi, Taiwo A. "Computational Study of Ring-Cusp Magnet Configurations that Provide Maximum Electron Confinement." Wright State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=wright1166226698.

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7

Botha, Johannes Rudolf. "Design of an RF ion thruster." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86267.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Recent years have seen a decline in the rate of space exploration due to the inefficiency of chemical rockets. Therefore alternative fuel efficient propulsion methods are being sought to enable cost effective deep space exploration. The high fuel efficiency of electric thrusters enable a spacecraft to travel further, faster and cheaper than any other propulsion technology available. Thus electric propulsion has become the propulsion of choice for scientists and engineers. A typically electric thruster contains some sort of

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8

Rodrigues, Junior Robério. "Avaliação comparativa de recobrimentos superficiais para tuchos de válvula através de ensaios de desgaste." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263572.

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Orientador: Cecília Amélia de Carvalho Zavaglia<br>Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-16T19:02:52Z (GMT). No. of bitstreams: 1 RodriguesJunior_Roberio_M.pdf: 3328140 bytes, checksum: d0f2014c71eeb448ae530ee5df6b8479 (MD5) Previous issue date: 2010<br>Resumo: Com o intuito de avaliar a eficiência de diferentes recobrimentos superficiais aplicados a tuchos de válvulas - um componente utilizado em motores à combustão - foram propostos alguns recobrimentos que foram comparados a um recob

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9

Benyo, Theresa L. "Analytical and Computational Investigations of a Magnetohydrodynamic (MHD) Energy-Bypass System for Supersonic Turbojet Engines to Enable Hypersonic Flight." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1369153719.

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10

Gustafsson, Karin. "Ion Current Dependence on Operating Condition and Ethanol Ratio." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8053.

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<p>This masters thesis investigates the possibility to estimate the ethanol content in the fuel using ion currents. Flexible fuel cars can be run on gasoline-ethanol blends with an ethanol content from0 to 85 percentage. It is important for the engine control system to have information about the fuel. In todays cars the measurements of the fuel blend are done by a sensor. If it is possible to do this with ion currents this can be used to detect if the sensor is broken, and then estimate the ethanol content until the sensor gets fixed. The benefit</p><p>of using ion currents is that the signal

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11

Duchemin, Olivier B. Shepherd J. E. "An investigation of ion engine erosion by low energy sputtering /." Diss., Pasadena, Calif. : California Institute of Technology, 2001. http://resolver.caltech.edu/CaltechETD:etd-02242002-122344.

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12

Morris, Bradford Shepherd J. E. Shepherd J. E. "Charge-exchange collision dynamics and ion engine grid geometry optimization /." Diss., Pasadena, Calif. : California Institute of Technology, 2007. http://resolver.caltech.edu/CaltechETD:etd-02282007-154751.

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13

Tsay, Michael Meng-Tsuan. "Two-dimensional numerical modeling of Radio-Frequency ion engine discharge." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62713.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 106-109).<br>Small satellites are gaining popularity in the space industry and reduction in spacecraft size requires scaling down its propulsion system. Low-power electric propulsion poses a unique challenge due to various scaling penalties. Of high-performance plasma thrusters, the radio-frequency ion engine is most likely to succeed in scaling as it does not require an externally applied magnetic field and is

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Mahalingam, Sudhakar. "Particle Based Plasma Simulation for an Ion Engine Discharge Chamber." Wright State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1198181910.

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15

Williams, Logan Todd. "Ion acceleration mechanisms of helicon thrusters." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47691.

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A helicon plasma source is a device that can efficiently ionize a gas to create high density, low temperature plasma. There is growing interest in utilizing a helicon plasma source in propulsive applications, but it is not yet known if the helicon plasma source is able to function as both an ion source and ion accelerator, or whether an additional ion acceleration stage is required. In order to evaluate the capability of the helicon source to accelerate ions, the acceleration and ionization processes must be decoupled and examined individually. To accomplish this, a case study of two helico

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Manzoor, Ahmad Mubashir. "Integration of JasperReports Server Engine in iCON Telematics Application." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-307157.

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Leica Geosystems Technology AB is a Sweden-based company (part of Hexagon Group) that designs and manufactures software and hardware for building surveying and machine control applications. Modern machine control applications are important for today's construction market as they help in improving accuracy, reliability and performance thereby helping construction companies complete the work in time and cutting down on extra costs. One of Leica Geosystems Technology's software products is a web-based solution for fleet management and production control called iCON Telematics. Using iCON Telemati

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17

Molin, Johan. "Investigation of Correlations Between COV of Ion Integral and COV of IMEP in a Port-Injected Natural-Gas Engine." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-15949.

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<p>Correlations between the coefficient of variations (COV) of ion current integrals and COV of indicated mean effective pressure (IMEP) are investigated. The investigations are made to see if there is a possibility to use ion sense technique for closed loop combustion control to maximize Exhaust Gas Recirculation (EGR) level with remaining combustion stability. The engine studied in this thesis is a stoichiometric natural gas engine with a three way catalyst working with different EGR levels. One way to increase the efficiency in a stoichiometric natural gas engine is to maximize the EGR leve

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18

Correa, Chrys. "Combustion simulations in Diesel engines using reduced reaction mechanisms." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961521937.

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Lübbecke, Marco. "Engine scheduling by column generation." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962821152.

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Gohary, Mohamed Morsy Abdel Meguid Salama el. "Diesel engines and solar energy for electric and cooling applications." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973168242.

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21

Espinoza, Villegas Pablo Andrés. "A simulation engine for ion-lithium battery packs in electric vehicles based on energetic autonomy and remaining useful life criteria." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/144139.

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Magíster en Ciencias de la Ingeniería, Mención Eléctrica<br>Los últimos desarrollos en baterías de ión-litio han permitido una verdadera revolución en la industria automotriz. Los vehículos eléctricos representan una porción del mercado que aumenta año a año. Estos vehículos operan bajo condiciones variables, requiriendo de bancos de baterías para hacer frente a las respectivas demandas de torque y potencia. En este trabajo construimos un simulador que, dado el tamaño del banco, determina cuando una recarga (autonomía) o reemplazo del banco (vida útil remanente) son necesarios. Con este

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22

Lima, Leonardo Lopes. "Identificação dos fenômenos de combustão e detonação em um motor ciclo Otto através da corrente iônica." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-01112016-090618/.

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As legislações com restrições nos níveis de emissões de poluentes e a grande concorrência entre as montadoras fomentaram o desenvolvimento de sistemas mais eficientes de gerenciamento de motores a combustão interna. Entretanto, a falta de sensores que identifiquem as propriedades da combustão, e que sejam economicamente viáveis, dificulta o desenvolvimento de novos sistemas. Visando suprir parte dessas limitações, este trabalho propõe o uso do sensor de corrente iônica com duas finalidades: identificação dos fenômenos de combustão e detonação. Para identificação da combustão, atualmente é util

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23

Mahmood, Zulshan. "An experimental investigation of flow processes in dual-intake valve engines." Thesis, King's College London (University of London), 1998. https://kclpure.kcl.ac.uk/portal/en/theses/an-experimental-investigation-of-flow-processes-in-dualintake-valve-engines(18d3d406-ddb3-4794-a976-9cbc37a220c3).html.

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24

Leoni, Luca. "Utilizzo di Google Kubernetes Engine per un'applicazione IoT di gestione dell'acqua in agricoltura." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21008/.

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Questa tesi ha come obiettivo quello di studiare l’ambiente Kubernetes e di importare l’applicazione sviluppata per il progetto SWAMP su Google Kubernetes Engine (GKE). SWAMP (Smart Water Management Platform) è un progetto Europeo H2020 che ha come obiettivo quello di realizzare una piattaforma per la gestione dell’acqua in agricoltura, con lo scopo primario di ridurne al minimo il consumo. Essa si basa su IoT, cioè “Internet of Things”, ed altre tecnologie avanzate come sensori e droni. Kubernetes è una piattaforma open source che permette di orchestrare tra loro applicazioni containerizzate,

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25

Rundin, Patrick. "Evaluation of a statistical method to use prior information in the estimation of combustion parameters." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6255.

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<p>Ion current sensing, where information about the combustion process in an SI-engine is gained by applying a voltage over the spark gap, is currently used to detect and avoid knock and misfire. Several researchers have pointed out that information on peak pressure location and air/fuel ratio can be gained from the ion current and have suggested several ways to estimate these parameters.</p><p>Here a simplified Bayesian approach was taken to construct a lowpass-like filter or estimator that makes use of prior information to improve estimates in crucial areas. The algorithm is computationally

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26

Penkal, Bryan James. "Steps in the Development of a Full Particle-in-Cell, Monte Carlo Simulation of the Plasma in the Discharge Chamber of an Ion Engine." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1367586856.

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27

Cong, Phan Chinh. "An approach to adaptive inference engine for rule-based consultation systems." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982121717.

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28

Renaud, Denis. "Caractérisation du propulseur PEGASES : diagnostics du filtre magnétique et du faisceau : optimisation de la géométrie." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2018/document.

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Le propulseur de PEGASES est un moteur ionique qui diffère des autres technologies. La particularité de ce propulseur est l’utilisation d’un gaz électronégatif, à savoir le SF₆. Un champ magnétique est utilisé pour piéger les électrons et augmenter la production des ions négatifs. Le plasma résiduel à faible densité d’électrons, dit plasma ion-ion, permet l’extraction et l’accélération des ions positifs et négatifs. Les ions recombinent par paire dans le faisceau et garantissent la neutralité dans le faisceau. L’extraction d’une quantité équivalente d’ions positifs et négatifs permet ainsi d’é

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Quarantini, Enrico. "Progettazione e sviluppo di video-giochi per Smart-Phone: un caso di Studio su iPhone." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3521/.

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Karagiannopoulos, Solon. "In-cylinder species imaging in internal combustion engines using absorption spectroscopy." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/incylinder-species-imaging-in-internal-combustion-engines-using-absorption-spectroscopy(ec710f4d-df5d-481e-a864-73b9be1f1c6a).html.

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Combustion diagnostics based on Diode Lasers have been in focus of research in recent years, due to the advances in optical technologies. Tunable Diode Laser Absorption Spectroscopy (TDLAS) has been employed for in-cylinder, nonintrusive, crank-angle resolved measurements in Internal Combustion (IC) engines. This thesis addresses a novel opto-electronic, multi-wavelength scheme for line-ofsight gas absorption measurements and tomographic imaging in IC engines. High temporal resolution measurements of H2O vapour using direct absorption spectroscopy (DAS), with external intensity modulation for

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Khalid, Ashiq Hussain. "Development of phosphor thermometry systems for use in development gas turbine engines." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/development-of-phosphor-thermometry-systems-for-use-in-development-gas-turbine-engines(f01316f9-4622-4a6d-b2d0-611a9191b5eb).html.

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The pursuit for improved engine efficiency is driving the demand for accurate temperature measurement inside turbine engines. Accurate measurement can allow engines to be operated closer to their design limits to improve thermal efficiency. It can enable engineers to verify mechanical integrity, provide better prediction of component life, validate CFD and other design tools and aid the development for leaner more efficient engines. Unfortunately, experimentally measuring surface temperatures under harsh rotating conditions is challenging. This EngD study conducted by Ashiq Hussain Khalid at t

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Dathe, Hendrik. "Nanostructured sulfur traps for the protection of high performance NOx storage, reduction catalysts in low emission engine applications." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979066832.

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Chen, Dejin. "Untersuchungen zur Optimierung eines solaren Niedertemperatur-Stirlingmotors." Doctoral thesis, [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=974523542.

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34

Rolph, James. "Residual stress characterisation in forgings for aero-engine application." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/residual-stress-characterisation-in-forgings-for-aeroengine-application(f0963136-4919-48f9-91fe-34a752ff4666).html.

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Residual stresses are the stresses which are present within a component without any external load. They can be introduced through any number of manufacturing processes and in-service conditions, meaning that they are almost ubiquitous in engineering components. The characterisation of residual stress is an important field of research particularly in an engineering context since the effects of residual stress sum with the loads. As a result, the performance of a component can be greatly enhanced, or significantly reduced, by the presence of residual stress depending on the sign of the stress an

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35

Abduljalil, Abdulrahman S. Ahmed. "Investigation of thermoacoustic processes in a travelling-wave looped-tube thermoacoustic engine." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/investigation-of-thermoacoustic-processes-in-a-travellingwave-loopedtube-thermoacoustic-engine(f46f9345-d1b5-40a4-8388-f884d7adb7bc).html.

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In thermoacoustic devices, thermal energy is directly converted to an acoustic wave (mechanical energy) or an acoustic input is converted into thermal energy. This is a result of heat interaction between a solid material and adjacent gas, within the so-called ‘‘thermal penetration depth” of the compressible oscillatory flow. Thermoacoustic technology is receiving growing interest in research for its many advantages, such as having no moving parts, being environmentally friendly and the possibility of using renewable energy for its operation (Adeff and Hofler, 2000). However, this technology is

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36

Engin, İlhan [Verfasser], Markus [Akademischer Betreuer] Büscher, and Carsten [Akademischer Betreuer] Müller. "Towards Polarization Measurements of Laser-accelerated Helium-3 Ions / Ilhan Engin. Betreuer: Markus Büscher. Gutachter: Markus Büscher ; Carsten Müller." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2016. http://d-nb.info/1082033898/34.

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Engin, İlhan Verfasser], Markus [Akademischer Betreuer] Büscher, and Carsten [Akademischer Betreuer] [Müller. "Towards Polarization Measurements of Laser-accelerated Helium-3 Ions / Ilhan Engin. Betreuer: Markus Büscher. Gutachter: Markus Büscher ; Carsten Müller." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2016. http://d-nb.info/1082033898/34.

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38

Chohan, Sundas. "Evolving strategies to engineer tendon tissue in vitro." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/evolving-strategies-to-engineer-tendon-tissue-in-vitro(b1046d18-3e30-44bb-841e-a975a776cc5d).html.

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Tendons are able to undergo repeated cyclic loading in vivo without permanent deformation or mechanical failure. However, diseased, traumatised and decellularised tendons gradually lose the ability to resist load and fail because of creep deformation. The molecular basis of the mechanical properties of tendon and how cells establish and maintain these properties is poorly understood. New knowledge in this area is required to develop novel medical strategies to improve tendon repair and regeneration. Recent advances in tissue bioengineering have led to the formation of fibrin-based tendon-like

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39

Katragkou, Eleni. "Aircraft based measurements of atmospheric sulfur dioxide and ground based measurements of gaseous sulfur (VI) in the simulated internal flow of an aircraft engine implications for atmospheric aerosol formation /." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969654588.

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Calverley, Dan. "Cumulative emissions reduction in the UK passenger car sector through near-term interventions in technology and use." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/cumulative-emissions-reduction-in-the-uk-passenger-car-sector-through-nearterm-interventions-in-technology-and-use(686e7c51-432b-4a0b-83f1-a1b127e1e5c3).html.

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Responsible for one in eight tonnes of national CO₂ emissions, the passenger car sector is pivotal to delivering on UK climate change commitments to avoiding warming of more than 2°C. This thesis provides a clear and quantitative framing of emissions reduction at the sectoral level, by disaggregating global cumulative emissions budgets and pathways associated with a range of probabilities of exceeding 2°C. The relatively low level of abatement currently planned for the UK car sector, it is argued, needs to be significantly increased for the following reasons: (i) a scientific basis in cumulati

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Bashtova, Kateryna. "Modélisation et identification de paramètres pour les empreintes des faisceaux de haute énergie." Thesis, Université Côte d'Azur (ComUE), 2016. http://www.theses.fr/2016AZUR4112/document.

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Le progrès technologique nécessite des techniques de plus en plus sophistiquées et précises de traitement de matériaux. Nous étudions le traitement de matériaux par faisceaux de haute énergie : un jet d’eau abrasif, une sonde ionique focalisée, un laser. L’évolution de la surface du matériau sous l’action du faisceau de haute énergie est modélisée par une EDP. Cette équation contient l’ensemble des coefficients inconnus - les paramètres de calibration de mo- dèle. Les paramètres inconnus peuvent être calibrés par minimisation de la fonction coût, c’est-à-dire, la fonction qui décrit la différe

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Pecino, Rodriguez Jose Ignacio. "Portfolio of original compositions : dynamic audio composition via space and motion in virtual and augmented environments." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/portfolio-of-original-compositions-dynamic-audio-composition-via-space-and-motion-in-virtual-and-augmented-environments(637e9f5b-7d42-4214-92c4-70bac912cec2).html.

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Electroacoustic music is often regarded as not being sufficiently accessible to the general public because of its sound-based abstract quality and the complexity of its language. Live electronic music introduces the figure of the performer as a gestural bodily agent that re-enables our multimodal perception of sound and seems to alleviate the accessibility dilemma. However, live electronic music generally lacks the level of detail found in studio-based fixed media works, and it can hardly be transferred outside the concert hall situation (e.g. as a video recording) without losing most of its f

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Taylor-Goh, Sylvia Margaret Eileen Josephine. "Are there similarities and differences in the content and process of clinical decision making by Biomedical Engineers, Occupational Therapists and Speech and Language Therapists when assessing for electronic assistive technology for adults with an acquired brain injury?" Thesis, King's College London (University of London), 2015. http://kclpure.kcl.ac.uk/portal/en/theses/are-there-similarities-and-differences-in-the-content-and-process-of-clinical-decision-making-by-biomedical-engineers-occupational-therapists-and-speech-and-language-therapists-when-assessing-for-electronic-assistive-technology-for-adults-with-an-acquired-brain-injury(b7744cee-d63f-4178-a6e8-c8bb9a99c680).html.

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Electronic assistive technology (EAT) is prescribed by different professionals. Little is known regarding how these professionals make prescription decisions or their perceptions of their specialist knowledge and role in the assessment process. Study Aims: • to explore the participants’ perceptions of their specialist knowledge and role (Study 1); • to investigate the similarities and differences in the content and process of clinical decision making (CDM) during assessment and prescription of EAT for adults with an acquired brain injury (Study 2). Design: A cross-sectional design employing co

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Duchemin, Olivier Bernard. "An investigation of ion engine erosion by low energy sputtering." Thesis, 2001. https://thesis.library.caltech.edu/725/1/OBD_thesis.pdf.

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Unlike chemical propulsion systems, which are fundamentally limited in performance by propellant energy density, electric propulsion devices, such as ion engines, are limited in iotal deliverable impulse by maximum propellant throughput due to engine wear. In order to perform realistic modeling of engine lifetime, the erosion mechanisms involved must be understood. In particular, the damage---or sputtering---caused by slow ions on solid surfaces is extremely difficult to quantify. We first review the engine failure modes in which sputtering of molybdenum by slow xenon ions plays a critica

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Morris, Bradford S. "Charge-Exchange Collision Dynamics and Ion Engine Grid Geometry Optimization." Thesis, 2007. https://thesis.library.caltech.edu/807/1/thesis_main.pdf.

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<p>The development of a new three-dimensional model for determining the absolute energy distribution of ions at points corresponding to spacecraft surfaces to the side of an ion engine is presented. The ions resulting from elastic collisions, both charge-exchange (CEX) and direct, between energetic primary ions and thermal neutral xenon atoms are accounted for. Highly resolved energy distributions of CEX ions are found by integration over contributions from all points in space within the main beam formed by the primary ions.</p> <p>The sputtering rate due to impingement of these ions on a s

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Lee, Zhih-Young, and 李志洋. "Occupational Arsenic Exposure and Urinary Inorganic Arsenic Metabolites of Ion Implanter Maintenance Engineers." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/43586710765809092779.

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碩士<br>國立臺灣大學<br>職業醫學與工業衛生研究所<br>89<br>In the wafer fabrication facility of semiconductor industry, the routine maintenance of ion implanter potentially exposes the engineers to hazard when the maintenance engineers disassemble the ion implanter for different types of maintenance, especially arsenic or arsenic compounds in it. A previous study has shown that the urinary inorganic arsenic metabolites levels of maintenance engineers slightly increased during the ion implanter maintenance days. This study analyzed specific inorganic arsenic metabolites levels of the ion implanter mainte

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Beernaert, Leander Edward Bessa. "Cross platform 3D rendering engines and mobile devices/smartphones." Master's thesis, 2011. http://hdl.handle.net/1822/28067.

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Dissertação de mestrado em Engenharia Informática<br>Now more than ever, we live in a cross platform technological world. We are surrounded by various platforms, each with their own set of advantages and drawbacks. We’ve come to a point where we cannot delay the transition of software from one platform to another. This has become increasingly more visible with the "rise of the smartphones". Their evolution has sparked quite an interest and due to their ubiquitous nature and, CPU and GPU performance, they prove to be very interesting and useful computing devices. The aim of this dissertation

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Chen, Li. "Integrated design and control optimization of hybrid electric marine propulsion systems based on battery performance degradation model." Thesis, 2019. http://hdl.handle.net/1828/11149.

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This dissertation focuses on the introduction and development of an integrated model-based design and optimization platform to solve the optimal design and optimal control, or hardware and software co-design, problem for hybrid electric propulsion systems. Specifically, the hybrid and plug-in hybrid electric powertrain systems with diesel and natural gas (NG) fueled compression ignition (CI) engines and large Li-ion battery energy storage system (ESS) for propelling a hybrid electric marine vessel are investigated. The combined design and control optimization of the hybrid propulsion system is

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Campos, Bruno Miguel Alves de. "Cálculo a Brincar Desenvolvimento de um Jogo Sério para uma melhor compreensão Matemática." Master's thesis, 2018. http://hdl.handle.net/10362/56302.

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Nos dias de hoje têm-se identificado vários problemas na aprendizagem das crianças nas várias disciplinas, com especial enfoque na matemática. As cri-anças com mais problemas neste domínio têm um défice de aprendizagem rela-tivamente a outras crianças o que condiciona as suas escolhas de futuro, que ficam mais limitadas podendo resultar, em casos extremos, numa exclusão social. Esta problemática tem tido várias abordagens de solução, utilizando dife-rentes formas e metodologias, que podem envolver jogos tradicionais ou manu-ais escolares. Estes métodos disponíveis, pela sua limitação, não têm

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Smrž, Dominik. "Elektroforetické stanovení inhibitorů koroze v chladicích kapalinách." Master's thesis, 2019. http://www.nusl.cz/ntk/nusl-396754.

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A determination of corrosion inhibitors in engine coolants represent a difficult analytical problem due to their different physicochemical properties. Nowadays a lot of instrument methods are needed to determine them. The aim of this work was the development of methods for their determination using only one instrumentation. Capillary zone electrophoreses was chosen as a suitable technique. Three electrophoretic methods for three groups of corrosion inhibitors were developed. Firstly, method for determination of inorganic anions was developed in range from 5 to 50 ppm with limit of detection ar

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