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Дисертації з теми "Efficiency of control"

Автор: Grafiati

Опубліковано: 28 травня 2022

Оновлено: 31 липня 2025

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1

Ding, Yihang. "Computational Efficiency of Predictive Control." Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522028.

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2

Vedin, Jonas, and Robert Widén. "Stochastic Knock Control for Improved Efficiency." Thesis, Linköpings universitet, Fordonssystem, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-158635.

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Increasing the efficiency and performance of internal combustion engines is always of interest in the automotive industry. One limiting factor to achieve this in gasoline combustion engines is the ignition timing which can not always be set where optimal ignition efficiency and performance is obtained. This is due to the knock phenomenon which is an abnormal combustion process that can damage the engine. Due to knock, a feedback controller which sets the ignition timing at the best possible value without the risk of harming the engine is required. In this thesis, a statistically driven knock i

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3

Olsson, Magnus. "Efficiency Evaluation of SimulatedUSAR Control Methods." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-136405.

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This essay details a 3D simulation of a number of control methods used for maneuvering of teleoperated USAR robots. The implementation was produced in the Unity3D engine. The simulation implemented different variations on field-ofview angle, turning algorithms, and camera view perspectives. An evaluation using volunteer test operators was conducted and discussed. The sample size was too small to draw any definitive conclusions. Further testing is advised.<br>Denna uppsats behandlar en 3D-simulering samt användartester av flera olika kontrollmetoder som används vid fjärrstyrning av obemannade r

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4

Orr, Jeb S. "High efficiency thrust vector control allocation." Thesis, The University of Alabama in Huntsville, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3561548.

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<p> The design of control mixing algorithms for launch vehicles with multiple vectoring engines yields competing objectives for which no straightforward solution approach exists. The designer seeks to optimally allocate the effector degrees of freedom such that maneuvering capability is maximized subject to constraints on available control authority. In the present application, such algorithms are generally restricted to linear transformations so as to minimize adverse control-structure interaction and maintain compatibility with industry-standard methods for control gain design and stability

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5

Murray, Andrew James. "Control of cardiac metabolism and efficiency." Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:858cc1f9-7ba0-4999-a1c8-614a950888c2.

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6

Stout, Malcolm Russell Jr. "Cooling Tower Fan Control for Energy Efficiency." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-05082003-122724/.

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This thesis evaluates the economics of alternative cooling tower capacity control methods. Annual fan electrical energy requirements are calculated for towers with single-speed, two-speed, and variable-speed fans. Fan energy requirements are determined for counter-flow and cross-flow towers designed for low initial cost and for energy efficiency. Effectiveness-NTU equations are solved to predict cooling tower performance at various fan speeds. Natural convection, which determines the cooling capacity when the fan is off, is accounted for using a mean enthalpy difference. Ambient conditions are

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7

Tank, Prabhulal M. "Single and multiple boiler control for efficiency." Thesis, London South Bank University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259992.

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8

Guebeli, Markus. "Optimum efficiency control of the CTX powertrain." Thesis, University of Bath, 1993. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359851.

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9

Mamouei, M. H. "Energy efficient adaptive cruise control : towards benchmarking energy efficiency in the control of partially and fully automated vehicles." Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/19154/.

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Fully automated vehicles are expected to have a significant share of the road network traffic in the near future. Several commercial vehicles with full-range adaptive cruise control systems or semi-autonomous functionalities are already available in the market. This provides a unique opportunity to improve the acceleration behaviour of vehicles, and thereby, improve network’s efficiency in terms of important performance indicators such as fuel consumption and traffic throughput. However, automated driving systems usually adopt a highly conservative driving strategy to ensure safety and fuel ef

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10

Faust, Justin E. "Increase efficiency using the six sigma methodologies." Online version, 2009. http://www.uwstout.edu/lib/thesis/2009/2009faustj.pdf.

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11

Morini, Simone. "Investigation on energy efficiency for servo control applications." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/12873/.

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Lo scopo della tesi è stato migliorare la previsione dei consumi energetici di una soluzione meccatronica per poter fornire ai clienti un'informazione più precisa. Viene svolta un'analisi teorica delle perdite ed un'indagine sullo stato dell'arte dei componenti. Successivamente viene sviluppato un codice per generare delle mappe di efficienza per il motore elettrico, in grado di considerare il particolare punto di funzionamento nel diagramma coppia velocità. E' stato condotto un esperimento per validare il suddetto metodo nelle condizioni operative reali. Infine, le informazioni ricavate d

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12

Ahlkrona, Josefin. "Computational Ice Sheet Dynamics : Error control and efficiency." Doctoral thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-283442.

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Ice sheets, such as the Greenland Ice Sheet or Antarctic Ice Sheet, have a fundamental impact on landscape formation, the global climate system, and on sea level rise. The slow, creeping flow of ice can be represented by a non-linear version of the Stokes equations, which treat ice as a non-Newtonian, viscous fluid. Large spatial domains combined with long time spans and complexities such as a non-linear rheology, make ice sheet simulations computationally challenging. The topic of this thesis is the efficiency and error control of large simulations, both in the sense of mathematical modelling

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13

Olds, Kathryn Curran. "Inhibitory Control Efficiency In Successful Weight Loss Participants." ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/313.

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Eating unhealthy foods and eating past satiety are inappropriate behaviors that promote obesity. The ability to effectively inhibit an inappropriate behavior is a key component of cognitive restraint and its impairment has been previously linked to obesity. In this study, a Go/No-Go fMRI task was completed by a cohort of adult women that had experienced initial weight loss followed by various levels of weight regain or continued weight loss. Region of interest fMRI analysis revealed that greater total weight loss was significantly related to decreasing activation in the right inferior frontal

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14

AL-HOOR, WISAM. "ADAPTIVE EFFICIENCY OPTIMIZATION FOR DIGITALLY CONTROLLED DC-DC CONVERTERS." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2453.

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The design optimization of DC-DC converters requires the optimum selection of several parameters to achieve improved efficiency and performance. Some of these parameters are load dependent, line dependent, components dependent, and/or temperature dependent. Designing such parameters for a specific load, input and output, components, and temperature may improve single design point efficiency but will not result in maximum efficiency at different conditions, and will not guarantee improvement at that design point because of the components, temperature, and operating point variations. The ability

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15

Magnussen, Jonas. "Increased Energy Efficiency in Buildings using Model Predictive Control." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13815.

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The main objective in this thesis is to explore if a model predictive control scheme can increase the energy efficiency in office buildings with waterborne heating systems. The number of office buildings is constantly increasing, which displays the importance of efficient control systems. Since the aim is to decrease the energy consumption, improving the control systems in existing buildings and developing smart control schemes for new buildings are equally important. That is why the vision in this thesis is to design a control scheme that theoretically can be introduced to all new and existin

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16

Vukania, Adda Nancy, and Xiaochen Qin. "Long Term Cost Efficiency through Green Management Control Systems." Thesis, Linköpings universitet, Företagsekonomi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-79958.

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Title: Long term cost efficiency through green management control systems.Authors: Nancy Vukania &Xiaochen QinSupervisor: Åsa Karin-EngstrandBackground: The worldwide financial crisis of 2008 has reconfigured the economic turf leading to a more uncertain and turbulent playing field – a greater challenge for business strategy and the quest for optimization- The oil price hike of 2008 (Furlong 2010)1 caused its rippling effect to affect various cost categories including energy, labor and logistics thus causing a roller coaster business decision making process regarding outsourcing, off shori

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17

Verma, Sasha Santosh Magnus. "Maximum efficiency fuzzy logic control of an electric vehicle." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37988.pdf.

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18

Han, X. "Variable structure control of robot manipulators with computational efficiency." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603641.

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Анотація:

Variable structure control is a kind of nonlinear control with discontinuous input. The control input switches from one value to another according to the system states. Its usefulness of robotic control is the existence of the switching surface, since once the system states are sliding on the switching surface, the control is insensitive to the parameter uncertainty and external disturbances. The application of variable structure control for robot manipulators has experienced several stages. Most efforts have been to make this control method practically more applicable to robotics control prob

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19

Kneebone, Nigel J. "Efficiency and speed control of three-phase induction motors." Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277167.

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20

Wang, Xiawa. "Toward high efficiency radioisotope thermophotovoltaic system by spectral control." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113984.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 147-163).<br>This thesis describes the design, modeling, and measurement results of a radioisotope thermophotovoltaic system (RTPV) using a two-dimensional photonic crystal emitter and low bandgap thermophotovoltaic (TPV) cell to realize spectral control. The RTPV generator aims to use the decay heat released by plutonium-238 fuel to heat up the emitter to incandescence and convert the infr

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21

Ware, Laura M. (Laura Marie). "Design of control for efficiency of AUV power systems." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74915.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2012.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 71).<br>The MIT Rapid Development Group designed and built an internal combustion hybrid recharging system for the REMUS 600 Autonomous Underwater Vehicle (AUV) in collaboration with the MIT Lincoln Laboratory. This power system will recharge the lithium ion battery pack of the REMUS 600 and allow the vehicle to travel for 40 consecutive 12-hour missions without returning to recharge. This study analyzes the optimizatio

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22

Kawala-Janik, Aleksandra. "Efficiency evaluation of external environments control using bio-signals." Thesis, University of Greenwich, 2013. http://gala.gre.ac.uk/9810/.

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There are many types of bio-signals with various control application prospects. This dissertation regards possible application domain of electroencephalographic signal. The implementation of EEG signals, as a source of information used for control of external devices, became recently a growing concern in the scientific world. Application of electroencephalographic signals in Brain-Computer Interfaces (BCI) (variant of Human-Computer Interfaces (HCI)) as an implement, which enables direct and fast communication between the human brain and an external device, has become recently very popular. Cu

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23

Pawley, Michael Andrew. "The efficiency of monetary control and building society developments." Thesis, Sheffield Hallam University, 1991. http://shura.shu.ac.uk/20213/.

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Анотація:

An analysis is made of the major factors determining financial innovation and financial change by building societies and banks, and the particular innovations introduced are examined. The effects of these institutional developments upon the growth rates of the broad monetary aggregates relative to nominal income are analysed. Specific attention is paid to the personal sector's motives for holding money and particularly the willingness to hold interest-bearing money balances at building societies and banks. Special consideration is placed upon the abolition of the building societies' cartel, th

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24

Mei, Jun. "Energy efficiency control of direct expansion air conditioning systems." Thesis, University of Pretoria, 2009. http://hdl.handle.net/2263/67805.

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The dynamic mathematical models for direct expansion air conditioning (DX A/C) systems with respect to indoor carbon dioxide (CO2) concentration, relative humidity and air temperature and the coupling effects among them have been built in this thesis. To reduce the energy cost and improve the energy efficiency for DX A/C systems while maintaining both indoor air quality (IAQ) and thermal comfort at acceptable levels, a hierarchical control structure is proposed in this thesis. This control structure includes two levels. The upper level is an open loop optimal controller to generate the op

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25

Eperon, Giles E. "Active layer control for high efficiency perovskite solar cells." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:1fa78aab-7479-4fe2-8192-e1be1d12c171.

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The work documented in this thesis concerns the control and modification of semiconducting perovskite thin films for their use in perovksite solar cells (PSCs). PSCs are a promising new thin-film technology, offering both high solar to electricity conversion efficiencies and cheap fabrication costs. Herein, the boundaries of perovskite solar cell research are pushed further by tackling several challenges important to the field. Initially, this work focuses on understanding why the best PSCs made so far have been mesostructured devices, with the perovskite infiltrated into a scaffold. It is sho

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26

Fatih, Turkmen. "Exploring Dynamic Constraint Enforcement and Efficiency in Access Control." Doctoral thesis, Università degli studi di Trento, 2012. https://hdl.handle.net/11572/368368.

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Анотація:

Dynamic constraints such as Separation of Duty (SoD) prevent the possibility of frauds and enable flexible protection of sensitive resources appearing in active contexts. They are enforced in various ways depending on the access control model and the application. Role based access control (RBAC) employs restrictions on the activation of roles and the exercise of permissions by individuals for enforcing the constraints. However, whether a constraint specification correctly enforces a given dynamic policy is an open research question. This is mainly due to the nature of the dynamic constraint en

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27

Fatih, Turkmen. "Exploring Dynamic Constraint Enforcement and Efficiency in Access Control." Doctoral thesis, University of Trento, 2012. http://eprints-phd.biblio.unitn.it/694/1/Fatih_Turkmen_Thesis.pdf.

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Анотація:

Dynamic constraints such as Separation of Duty (SoD) prevent the possibility of frauds and enable flexible protection of sensitive resources appearing in active contexts. They are enforced in various ways depending on the access control model and the application. Role based access control (RBAC) employs restrictions on the activation of roles and the exercise of permissions by individuals for enforcing the constraints. However, whether a constraint specification correctly enforces a given dynamic policy is an open research question. This is mainly due to the nature of the dynamic constraint

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28

Walsh, A. "An adaptive controller with high computational efficiency." Thesis, Coventry University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377572.

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29

Khoury, Gabriel. "Energy efficiency improvement of a squirrel-cage induction motor through the control strategy." Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/19777/1/Gabriel_Khoury.pdf.

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Energy efficiency optimization of electric machines is an important research field and is part of the objectives of several international projects such as the European Commission Climate and Energy package which has set itself a 20% energy savings target by 2020, and was extended for 2030 with higher targets. Therefore, this thesis proposes an efficiency optimization method of the Induction Machine (IM) through the variation of the control parameters. To achieve this goal, the flux in the airgap is modified according to an optimal flux table computed off-line for all possible operating points.

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30

Jung, Eun-Sun. "Energy efficiency in wireless networks." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2718.

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Анотація:

Energy is a critical resource in the design of wireless networks since wireless devices are usually powered by batteries. Battery capacity is finite and the progress of battery technology is very slow, with capacity expected to make little improvement in the near future. Under these conditions, many techniques for conserving power have been proposed to increase battery life. In this dissertation we consider two approaches to conserving the energy consumed by a wireless network interface. One technique is to use power saving mode, which allows a node to power off its wireless network interface

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31

Saad, S. "Efficiency of mining electrical variable speed drive systems." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381103.

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32

Zhou, Yuefeng. "Energy-efficiency media access control in wireless ad hoc networks." Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/10675.

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Energy efficient Media Access Control (MAC) strategies have been widely confirmed to be one of the essential solutions for power-saving in Mobile Ad Hoc Networks (MANETs). The aim of the work in this thesis is to examine the existing energy efficient MAC protocols for wireless ad hoc networks, and to develop enhanced energy efficient MAC strategies for MANETs. Taking a typical example of the WLAN ad hoc network power saving mode, a statistical model is proposed for the analysis of the power-saving MAC performance in the presence of Rayleigh fading. The analysis and simulation results show that

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33

Silva, Mateus Grellert da. "Computational effort analysis and control in High Efficiency Video Coding." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/95943.

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Codificadores HEVC impõem diversos desafios em aplicações embarcadas com restrições computacionais, especialmente quando há restrições de processamento em tempo real. Para tornar a codificação de vídeos HEVC factível nessas situações, é proposto neste trabalho um Sistema de Controle de Complexidade (SCC) que se adapta dinamicamente a capacidades computacionais varáveis. Considera-se que o codificador faz parte de um sistema maior, o qual informa suas restrições como disponibilidade da CPU e processamento alvo para o SCC. Para desenvolver um sistema eficiente, uma extensiva análise de complexid

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34

Kshirsagar, Parag Mahendra. "Efficiency Improvement Strategies and Control of Permanent Magnet Motor Drives." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/77685.

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Permanent magnet brushless dc (PMBDC) and synchronous machines (PMSM) drives are favored in variable speed applications for their high efficiency operation. Energy efficiency improvement in such motor drives is of interest in recent times because of rising cost of energy. Accordingly, two current control options for improving efficiency of these drives are taken for study and they are; (i) injecting sinusoidal and non-sinusoidal currents in PMBDC machines and (ii) lowering switching frequency of inverter driving the PMSM but without having significant low ordered sidebands of currents. Both th

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35

Pearce, David Andrew James. "Improving spectrum efficiency in fixed cellular communication systems." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341520.

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36

Cao, Renfang. "Power efficiency analysis for an Active structure." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/27186.

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Methods for analyzing the structural-acoustic power efficiency of active structures are developed. For this work we define the power efficiency as the ratio of the sound power radiated by a structure to the maximum possible radiated sound power. An active structure is defined as one that has electromechanical actuators distributed over its surface for the purpose of structural-acoustic excitation. The power efficiency of planar, baffled structures with arbitrary boundary conditions is examined using a combination of methods based on numerical integration, variational principles, and finite ele

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37

Beck, C. M. "Instrumentation and control for minimum energy consumption in pneumatic conveying." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379820.

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Pneumatic conveyors have been used for the transportation of solids for many decades. Their design is substantially empirical, and because they run with almost no instrumentation or control, large safety factors are employed to ensure long-term safe and reliable conveying under all envisaged conveying conditions. The resulting excessive conveying velocity leads to increased energy consumption, pipeline wear and solids breakdown. The aim of the work reported in this thesis was to develop an instrumentation and control system which provides minimum cost conveying for a variable solids feedrate a

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38

Aljoaba, Sharif. "ACTIVE OPTIMAL CONTROL STRATEGIES FOR INCREASING THE EFFICIENCY OF PHOTOVOLTAIC CELLS." UKnowledge, 2013. http://uknowledge.uky.edu/ece_etds/18.

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Energy consumption has increased drastically during the last century. Currently, the worldwide energy consumption is about 17.4 TW and is predicted to reach 25 TW by 2035. Solar energy has emerged as one of the potential renewable energy sources. Since its first physical recognition in 1887 by Adams and Day till nowadays, research in solar energy is continuously developing. This has lead to many achievements and milestones that introduced it as one of the most reliable and sustainable energy sources. Recently, the International Energy Agency declared that solar energy is predicted to be one of

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39

Vada, Jostein. "Prioritized infeasibility handling in linear model predictive control : optimality and efficiency." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2000. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1425.

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40

Cohen, Ilan. "The impact of control structure selection on the closed-loop efficiency." Doctoral thesis, Universite Libre de Bruxelles, 1987. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/215129.

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41

Abobghala, Abdelmenem. "Assessing the energy efficiency of railway vehicles with wheelset active control." Thesis, University of Huddersfield, 2018. http://eprints.hud.ac.uk/id/eprint/34756/.

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Анотація:

Energy consumption in electric locomotives is principally the power consumed in traction motors. In order to reduce this energy consumption, the motion resistances of the train need to be reduced. These resistances include aerodynamics; inertial and grade forces; curving resistance; and bearing and wheel/rail friction. Though many factors such as gradient resistance cannot be modified, if a control system is included, curving resistance can be minimised by reducing the energy losses in the contact patches between wheel and rail. Therefore, operational practices could be modified in order to ob

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42

FREITAS, DANIEL ZACARIAS. "EFFICIENCY ANALYSIS AND CONTROL OF AN INTEGRATED IN-WHEEL ELECTRIC MOTOR." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=26373@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>PROGRAMA DE EXCELENCIA ACADEMICA<br>Esta dissertação apresenta o estudo para o desenvolvimento de um powertrain elétrico com motorização independente na massa não suspensa do veículo, acoplado diretamente nas rodas In Wheel ou Hub-Motor . O desenvolvimento do sistema proposto visa à maximização da eficiência dos veículos elétricos pela minimização das perdas relacionadas a sistemas mecânicos, como na transmissão convencional utilizada em veículos com motorização única. Outro

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Torrey, David Allan. "Optimal-efficiency constant-speed control of nonlinear variable reluctance motor drives." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/14713.

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Kluberg, Lionel J. (Lionel Jonathan). "Competition and loss of efficiency : from electricity markets to pollution control." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67766.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Sloan School of Management, Operations Research Center, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 221-230).<br>The thesis investigates the costs and benefits of free competition as opposed to central regulation to coordinate the incentives of various participants in a market. The overarching goal of the thesis is to decide whether deregulated competition is beneficial for society, or more precisely, in which context and under what market structure and what conditions deregulation is benefici

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Dimaria, Jeffrey V. "Plasmonic control of light emission for enhanced efficiency and beam shaping." Thesis, Boston University, 2014. https://hdl.handle.net/2144/10981.

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Thesis (Ph.D.)--Boston University<br>InGaN alloys and related quantum structures are of great technological importance for the development of visible light emitting devices, motivated by a wide range of applications, particularly solid-state lighting. The InxGa1-xN material system provides continuous emission tuning from the ultraviolet across the visible spectrum by changing the In content. InGaN/GaN quantum wells (QW) also provide an efficient medium for electroluminescence for use as light emitting diodes. It is well known, however, that increasing the In content degrades the internal quant

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Brenner, Ceri M. "Laser-driven proton beams : mechanisms for spectral control and efficiency enhancement." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=18234.

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This thesis reports on investigations of proton acceleration driven by the interaction of short, intense laser pulses with thin, solid targets. Laser-driven plasma interactions are used to establish accelerating quasi-electrostatic field gradients, on the rear surface of the target, that are orders of magnitude higher than the current limit of conventional, radio-frequency-based accelerator technology. The resulting high energy (multi-MeV) proton beams are highly laminar, have ultra-low emittance, and the inherently broad energy spectrum is particularly effective for use in proton imaging, hea

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Moosavi, Reza. "Improving the Efficiency of Control Signaling in Wireless Multiple Access Systems." Doctoral thesis, Linköpings universitet, Kommunikationssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-102537.

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Prior to the transmission of payload data in any multiple access system, there is generally a need to send control information such as scheduling assignments, transmission parameters and HARQ acknowledgments. This process is called control signaling and has a significant impact on the overall system performance. This dissertation considers different aspects of control signaling and proposes some novel schemes for improving it. The dissertation is split into two parts where in the first part the focus is on the transmission of scheduling assignments, and in the second part the focus is on impro

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Gu, Bin. "Power Converter and Control Design for High-Efficiency Electrolyte-Free Microinverters." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/25236.

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Microinverter has become a new trend for photovoltaic (PV) grid-tie systems due to its advantages which include greater energy harvest, simplified system installation, enhanced safety, and flexible expansion. Since an individual microinverter system is typically attached to the back of a PV module, it is desirable that it has a long lifespan that can match PV modules, which routinely warrant 25 years of operation. In order to increase the life expectancy and improve the long-term reliability, electrolytic capacitors must be avoided in microinverters because they have been identified as an unre

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Horning, Marcus. "Feedback Control for Maximizing Combustion Efficiency of a Combustion Burner System." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459356183.

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PEPE, CRESCENZO. "Model Predictive Control aimed at energy efficiency improvement in process industries." Doctoral thesis, Università Politecnica delle Marche, 2017. http://hdl.handle.net/11566/245448.

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L'attività di ricerca ha riguardato lo studio di tecniche di controllo avanzato orientate al risparmio energetico nelle industrie di processo. Sono stati approfonditi aspetti teorici e pratici del controllo avanzato, focalizzando l’attenzione su tecniche di controllo predittivo. È stato sviluppato un pacchetto di controllo avanzato basato su un’architettura di controllo predittivo lineare a due livelli. Contributi innovativi hanno riguardato lo sviluppo di una formulazione coerente e consistente dei due livelli, insieme a miglioramenti della loro politica di cooperazione. Ulteriori contributi

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