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Dissertations / Theses on the topic 'Energy maximization'

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1

Shaheen, Murtadha A. "POWER MAXIMIZATION FOR PYROELECTRIC, PIEZOELECTRIC, AND HYBRID ENERGY HARVESTING." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4462.

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The goal of this dissertation consists of improving the efficiency of energy harvesting using pyroelectric and piezoelectric materials in a system by the proper characterization of electrical parameters, widening frequency, and coupling of both effects with the appropriate parameters. A new simple stand-alone method of characterizing the impedance of a pyroelectric cell has been demonstrated. This method utilizes a Pyroelectric single pole low pass filter technique, PSLPF. Utilizing the properties of a PSLPF, where a known input voltage is applied and capacitance Cp and resistance Rp can be ca
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Al, Kiyumi Raja M. "Energy-aware MAC and routing protocol design for lifetime maximization in wireless sensor networks." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/846343/.

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WSN applications demand prolonged network operation in which manually replenishing the scarce battery resources of sensor nodes are not usually possible. When the limited energy of sensor nodes is completely exhausted, this leads to reduced coverage and may cause network partitioning, which dramatically reduces the network lifetime. In this respect, network lifetime enhancement is considered the most critical aspect of WSN performance. Prolonging network lifetime requires mechanisms that provide energy consumption balancing (ECB) in addition to energy efficiency (EE). This thesis investigates
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Hawkins, Tony (Greg Anthony). "Maximization of power capture in wind turbines using robust estimation and Lyapunov extremum seeking control." Thesis, Kansas State University, 2010. http://hdl.handle.net/2097/4643.

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Master of Science<br>Department of Mechanical and Nuclear Engineering<br>Guoqiang Hu<br>Warren N. White<br>In recent years, the concern has risen to establish clean sources for electric power generation. In 2009, Kansas established an RPS (Renewable Portfolio Standard) mandating utilities acquire 20% of their electricity from renewable energy by 2020 [32]. One of the most prominent renewable energy sources is wind energy. Utility companies now are investing more in wind capture systems to comply with this mandate. This increase in the manufacture of wind turbines has caused researchers to inve
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Lameiro, José David Lopes. "Projecto de um circuito conversor DC-DC para aplicações de “energy harvest”." Master's thesis, Faculdade de Ciências e Tecnologia, 2011. http://hdl.handle.net/10362/5897.

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Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para a obtenção do grau de Mestre em Engenharia Electrotécnica e de Computadores<br>Esta tese apresenta um circuito conversor DC-DC (“step-up”) para aplicações de “energy harvest”. Este circuito utiliza uma arquitectura “Switched capacitor voltage tripler”, controlada por um circuito MPPT baseado nos métodos “Load Voltage Maximization” e “Hill Climbing”. Este circuito foi desenhado usando a tecnologia “0.13 μm CMOS” de forma a funcionar com uma célula fotoeléctrica de “a-silicon”. Este circuito tem um
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Liu, Yang. "In Vivo Channel Characterization and Energy Efficiency Optimization and Game Theoretical Approaches in WBANs." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6660.

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This dissertation presents several novel accomplishments in the research area of Wireless Body Area Networks (WBANs), including in vivo channel characterization, optimization and game theoretical approaches for energy efficiency in WBANs. First, we performed the in vivo path loss simulations with HFSS human body model, built a phenomenological model for the distance and frequency dependent path loss, and also investigated angle dependent path loss of the in vivo wireless channel. Simulation data is produced in the range of 0.4−6 GHz for frequency, a wide range of distance and different angles.
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Bacinoglu, Tan Baran. "Finite-horizon Online Energy-efficient Transmissionscheduling Schemes Forcommunication Links." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615468/index.pdf.

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The proliferation of embedded systems, mobile devices, wireless sensor applications and in- creasing global demand for energy directed research attention toward self-sustainable and environmentally friendly systems. In the field of communications, this new trend pointed out the need for study of energy constrained communication and networking. Particularly, in the literature, energy efficient transmission schemes have been well studied for various cases. However, fundamental results have been obtained mostly for offline problems which are not applicable to practical implementations. In contras
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Capper, Joseph David. "Numerical Analysis and Parameter Optimization of Portable Oscillating-Body Wave Energy Converters." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103861.

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As a clean, abundant, and renewable source of energy with a strategic location in close proximity to global population regions, ocean wave energy shows major promise. Although much wave energy converter development has focused on large-scale power generation, there is also increasing interest in small-scale applications for powering the blue economy. In this thesis, the objective was to optimize the performance of small-sized, portable, oscillating-body wave energy converters (WECs). Two types of oscillating body WECs were studied: bottom hinged and two-body attenuator. For the bottom-hinged d
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8

Roseveare, Nicholas. "Optimization and resource management in wireless sensor networks." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/15730.

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Doctor of Philosophy<br>Department of Electrical and Computer Engineering<br>Balasubramaniam Natarajan<br>In recent years, there has been a rapid expansion in the development and use of low-power, low-cost wireless modules with sensing, computing, and communication functionality. A wireless sensor network (WSN) is a group of these devices networked together wirelessly. Wireless sensor networks have found widespread application in infrastructure, environmental, and human health monitoring, surveillance, and disaster management. While there are many interesting problems within the WSN framework,
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Edwall, Bill. "Virtual Power Plant Optimization Utilizing the FCR-N Market : A revenue maximization modelling study based on building components and a Battery Energy Storage System. Based on values from Sweden's first virtual power plant, Väla." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279520.

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Renewable energy resources are projected to claim a larger part of the Swedish power mix in coming years. This could potentially increase frequency fluctuations in the power grid due to the intermittency of renewable power generating resources. These fluctuations can in turn cause issues in the power grid if left unchecked. In order to resolve these issues, countermeasures are employed. One such countermeasure is for private actors to regulate power; in exchange they are financially compensated through reserve markets. The reserve market studied in this thesis is called Frequency Containment R
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Zubo, Rana H. A. "Distribution Network Operation with High Penetration of Renewable Energy Sources. Joint Active/Reactive Power Procurement: A Market-Based Approach for Operation of Distribution Network." Thesis, University of Bradford, 2019. http://hdl.handle.net/10454/18267.

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Distributed generators (DGs) are proposed as a possible solution to supply economic and reliable electricity to customers. It is adapted to overcome the challenges that are characterized by centralized generation such as transmission and distribution losses, high cost of fossil fuels and environmental damage. This work presents the basic principles of integrating renewable DGs in low voltage distribution networks and particularly focuses on the operation of DG installations and their impacts on active and reactive power. In this thesis, a novel technique that applies the stochast
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Stickeler, Charles Nickolas. "A Deadly Way of Doing Business: A Case Study of Corporate Crime in the Coal Mining Industry." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4231.

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To this point, research on corporate crime has been, for the most part, overlooked by mainstream criminology. In particular, corporate violations of safety regulations in the coal mining industry have yet to be studied within the field of criminology. The purpose of this thesis is to examine the crimes of a coal mining corporation, a corporation whose business decisions led to the worst coal mining disaster in forty years, along with the deaths of twenty-nine men. This thesis will utilize a case study format in order to illustrate the crimes committed by this corporation. Previous literatur
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Katbay, Zahra. "Développement d'antennes pour la détection de tumeurs cancéreuses dans le sein." Thesis, Brest, 2018. http://www.theses.fr/2018BRES0040/document.

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Le cancer du sein, l'une des principales causes de mortalité féminine dans le monde, peut être traité avec plus d’efficacité s'il est détecté à un stade précoce. L'imagerie micro-ondes (MWI), technique émergente, apparait comme prometteuse pour compléter les méthodes de diagnostics actuelles. Elle est non-ionisante et potentiellement peu coûteuse, possédant ainsi des caractéristiques clés pour être un bon candidat pour la détection de masse et pour un dépistage fréquent. Cette thèse résume les résultats d'une recherche novatrice menée sur un système micro-onde visant au dépistage dans les tiss
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Shang, Guokan. "Spoken Language Understanding for Abstractive Meeting Summarization Unsupervised Abstractive Meeting Summarization with Multi-Sentence Compression and Budgeted Submodular Maximization. Energy-based Self-attentive Learning of Abstractive Communities for Spoken Language Understanding Speaker-change Aware CRF for Dialogue Act Classification." Thesis, Institut polytechnique de Paris, 2021. http://www.theses.fr/2021IPPAX011.

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Grâce aux progrès impressionnants qui ont été réalisés dans la transcription du langage parlé, il est de plus en plus possible d'exploiter les données transcrites pour des tâches qui requièrent la compréhension de ce que l'on dit dans une conversation. Le travail présenté dans cette thèse, réalisé dans le cadre d'un projet consacré au développement d'un assistant de réunion, contribue aux efforts en cours pour apprendre aux machines à comprendre les dialogues des réunions multipartites. Nous nous sommes concentrés sur le défi de générer automatiquement les résumés abstractifs de réunion.Nous p
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Wang, Rui. "Distributed Cooperative Communications and Wireless Power Transfer." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/62.

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In telecommunications, distributed cooperative communications refer to techniques which allow different users in a wireless network to share or combine their information in order to increase diversity gain or power gain. Unlike conventional point-to-point communications maximizing the performance of the individual link, distributed cooperative communications enable multiple users to collaborate with each other to achieve an overall improvement in performance, e.g., improved range and data rates. The first part of this dissertation focuses the problem of jointly decoding
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15

Maaz, Mohamad. "Allocation de ressource et analyse des critères de performance dans les réseaux cellulaires coopératifs." Thesis, Rennes, INSA, 2013. http://www.theses.fr/2013ISAR0036/document.

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Dans les systèmes de communications sans fil, la transmission de grandes quantités d'information et à faible coût énergétique sont les deux principales questions qui n'ont jamais cessé d'attirer l'attention de la communauté scientifique au cours de la dernière décennie. Récemment, il a été démontré que la communication coopérative est une technique intéressante notamment parce qu'elle permet d'exploiter la diversité spatiale dans le canal sans fil. Cette technique assure une communication robuste et fiable, une meilleure qualité de service (QoS) et rend le concept de coopération prometteur pou
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Alghamdi, Turki. "Interactions of Connected Electric Vehicles with Modern Power Grids in Smart Cities." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42513.

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In a smart city, it is vital to provide a clean and green environment by curbing air pollution and greenhouse gas emissions (GHGs) from transportation. As a recent action from many governments aiming to minimize transportation’s pollution upon the climate, new plans have been announced to ban cars with gas engines throughout the world. Therefore, it is anticipated that the presence of electric vehicles (EVs) will grow very fast globally. Consequently, the necessity to establish electric vehicle supply equipment (EVSE) in the smart city through public charging stations is growing incrementally
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Fernandes, Eliseu António Calado. "Automação na maximização de produção de energia elétrica de um painel solar." Master's thesis, Universidade de Évora, 2012. http://hdl.handle.net/10174/15028.

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Apresenta-se a implementação de uma plataforma para um sistema de seguimento solar de dois eixos, que utiliza como método de seguimento a avaliação da potência elétrica produzida por uma célula fotovoltaica. O protótipo é motorizado por dois motores de passo, controlados automaticamente por um controlador lógico programável (Siemens S7-300) com módulos funcionais FM353 e FM350-1. O dispositivo é constituído por dois subsistemas. O subsistema principal é responsável pela execução dos movimentos pré-programados de pesquisa e colocação do painel na posição que maximiza a potência elétrica. O subs
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18

Zuo, Fangzhi. "Energy-efficient relay cooperation for lifetime maximization." Thesis, 2011. http://hdl.handle.net/10155/188.

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We study energy-efficient power allocation among relays for lifetime maximization in a dual-hop relay network operated by amplify-and-forward relays with battery limitations. Power allocation algorithms are proposed for three different scenarios. First, we study the relay cooperation case where all the relays jointly support transmissions for a targeted data rate. By exploring the correlation of time-varying relay channels, we develop a prediction-based relay cooperation method for optimal power allocation strategy to improve the relay network lifetime over existing methods that do not predict
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19

Kinjo, Fuminao. "Maximization of energy capture of passive, variable-speed wind-turbine." Thesis, 2003. http://hdl.handle.net/1957/32375.

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This thesis presents and examines the concept that the output of a wound-rotor induction generator (WRIG) can be limited by means of linking to external impedances for wind-turbine generating system application. An 80kW-WRIG is simulated as a model to examine the control of the output power vs. speed characteristic. Model of WRIG derived from per phase equivalent circuit is organized, then it is estimated how much external impedances affect the characteristic of output power for it to approach to a typical wind-turbine curve. Practical tests are performed using 80kW-WRIG in testing lab to vali
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20

Lin, Yean-ping, and 林晏平. "Lifetime Maximization in AF Cooperative Networks with Energy-Harvesting Relays." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/8c2etv.

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碩士<br>國立中山大學<br>通訊工程研究所<br>103<br>In this thesis, we consider AF cooperative networks with multiple radio frequency energy-harvesting (RFEH) relays, and investigate power allocation and relay selection strategies to prolong the network lifetime since relays are battery-powered with limited energy. Through cooperation among multiple relays, reliability and transmission rate of cooperative networks are enhanced by exploiting spatial diversity. If relays rely on wireline power supplies, implementation cost must increase and mobility is lacked. Therefore, we consider relays apply RFEH technology t
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PATHIRANAGE, GUMINDA SANJEEWA PRIYADARSHANA. "MAXIMIZATION OF ENERGY GENERATION FROM SMALL HYDROPOWER PLANTIN SRI LANKA : -." Thesis, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-144597.

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Sri Lanka has a number of small waterfalls and channels. Related to this there is a significant potential to develop small hydropower plants, thus to generate much needed electricity for country’s development efforts. Small hydro power plants cause less environmental effects compared to large scale hydro power generation and power generation using fossil fuel. Therefore, it is a timely requirement to explore the possibilities of utilizing small water streams to generate electricity as much as possible as well as to optimize the energy generation with the available    water in those water strea
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Tai, Tzu-Hao, and 戴子豪. "Antenna Selection for Energy Efficiency Maximization in Massive MIMO Systems." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/64335462015492895627.

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碩士<br>國立交通大學<br>電信工程研究所<br>103<br>In this thesis, we consider the problem of deciding transmit RF chain configuration aimed to maximize the energy efficiency under the total power constraint in massive MIMO systems. The RF chain configuration can be decided by applying some antenna selection methods. Considering the trade-off between the performance and complexity, we propose a norm-and-correlation-based selection algorithm with low complexity for energy efficiency maximization. The proposed selection algorithm can be applied to decide the RF chain configuration in the massive multiuser MIMO (
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Yu, Ying-Chen. "Maximization of System Throughput in Wireless Networks with the Consideration of Energy Efficiency." 2004. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2507200414504100.

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Yu, Ying-Chen, and 俞瑩珍. "Maximization of System Throughput in Wireless Networks with the Consideration of Energy Efficiency." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/ttc5ym.

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碩士<br>國立臺灣大學<br>資訊管理學研究所<br>92<br>It seems clear that information services have an almost unlimited potential in a wireless environment. Many of today’s “fixed” applications will continue to be useful in a mobile environment, and a variety of new services are certain to evolve for people on the move. Since the energy conservation and the QoS guarantees are the major concerns in supporting heterogeneous data applications in mobile devices, the limited portable battery energy and the delay sensitivity of data services will also play important roles in the design of such transmission strategies.
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Hsiao, Yi-Chun, and 蕭奕群. "Energy Efficiency Maximization in Multi-user MISO Mixed RF/VLC Heterogeneous Wireless Network." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/p8e8rn.

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Duarte, Leonor de Sousa Barbosa. "The energy industry market: Maximization of business benefits: The case of the Iberian market." Master's thesis, 2021. http://hdl.handle.net/10071/23521.

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The primary goal of business strategy is to generate and develop competitive advantages by lowering costs or differentiating products. In this context, cost-effective electricity, renewable energy and energy efficiency seem to be actual solutions, allowing managers to create strategic possibilities to build advantages upon competitors. With the intent of leveraging business potential, the main purpose of this study is to provide a holistic analysis of the Iberian electricity industry and understand how businesses can take the greatest advantage of this market. This paper uses a qualitative a
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Yeh, Keng-Hung. "An Energy-efficient Routing Algorithm for the Maximization of System Lifetime in Wireless Sensor Networks." 2004. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2707200419305200.

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Yeh, Keng-Hung, and 葉耿宏. "An Energy-efficient Routing Algorithm for the Maximization of System Lifetime in Wireless Sensor Networks." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/ffh3qq.

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碩士<br>國立臺灣大學<br>資訊管理學研究所<br>92<br>The wireless sensor network has become a popular research topic in recent years. Advances in sensor node technology have enabled the rapid development of wireless sensor networks that can be used in various application areas, such as healthcare, the military, and the environment. Although there are many invaluable applications for wireless sensor networks, there are also a lot of emerging problems and challenges that need to be solved, at the same time. The biggest problem is how to efficiently use energy resources to prolong the overall system lifetime of suc
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Znaidi, Mohamed Ridha. "Performance Limits of Communication with Energy Harvesting." Thesis, 2016. http://hdl.handle.net/10754/609051.

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In energy harvesting communications, the transmitters have to adapt transmission to the availability of energy harvested during communication. The performance of the transmission depends on the channel conditions which vary randomly due to mobility and environmental changes. During this work, we consider the problem of power allocation taking into account the energy arrivals over time and the quality of channel state information (CSI) available at the transmitter, in order to maximize the throughput. Differently from previous work, the CSI at the transmitter is not perfect and may include esti
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Sarma, Siddhartha. "Resource Allocation in Wireless Networks for Secure Transmission and Utility Maximization." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3123.

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Resource allocation in wireless networks is one of the most studied class of problems. Generally, these problems are formulated as utility maximization problems under relevant constraints. The challenges posed by these problems vary widely depending on the nature of the utility function under consideration. Recently, the widespread prevalence of wireless devices prompted researchers and engineers to delve into the security issues of wireless communication. As compared to the wired medium, ensuring security for the wireless medium is more challenging mainly due to the broadcast nature of the t
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Sarma, Siddhartha. "Resource Allocation in Wireless Networks for Secure Transmission and Utility Maximization." Thesis, 2016. http://hdl.handle.net/2005/3123.

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Resource allocation in wireless networks is one of the most studied class of problems. Generally, these problems are formulated as utility maximization problems under relevant constraints. The challenges posed by these problems vary widely depending on the nature of the utility function under consideration. Recently, the widespread prevalence of wireless devices prompted researchers and engineers to delve into the security issues of wireless communication. As compared to the wired medium, ensuring security for the wireless medium is more challenging mainly due to the broadcast nature of the t
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Ansarifard, N. "CFD analysis and optimisation of unidirectional radial turbine geometry for application with oscillating water column wave energy converters." Thesis, 2019. https://eprints.utas.edu.au/32532/1/Ansarifard_whole_thesis.pdf.

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An oscillating-water-column (OWC) is a popular device for harnessing the power of ocean waves. A key component in the system is the air turbine, which operates as the power take-off unit (PTO) converting pneumatic power to mechanical. The turbine is probably the most complicated geometry in the system and is mainly designed in either an axial or radial configuration. The efficiency of a conventional radial impulse turbine (bidirectional version) rarely reaches more than 40%, which makes it a less efficient choice than axial turbines. However, the radial configuration has some advantageous fea
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Rodrigues, Joni Emanuel Campos. "Controlo Coordenado de Armazenamento de Energia em Edifícios Residenciais." Master's thesis, 2019. http://hdl.handle.net/10316/96073.

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Dissertação de Mestrado Integrado em Engenharia Electrotécnica e de Computadores apresentada à Faculdade de Ciências e Tecnologia<br>Face à corrida por soluções de substituição de energia fóssil por energias limpas, a energia solar entra como uma das escolhas fundamentais, devido à sua fácil instalação em edifícios, facilidade de transporte e manutenção, aliado à acentuada redução de custos. Contudo, o desajuste entre os perfis de consumo residencial de energia e a produção fotovoltaica leva a um desequilíbrio nos sistemas de energia. Assim, foram adaptados em edifícios residenciais, sistemas
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