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Dissertations / Theses on the topic 'Optimum power'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Jiang, Shan. "Optimum Wireless Power Transmission for Sensors Embedded in Concrete." FIU Digital Commons, 2011. http://digitalcommons.fiu.edu/etd/549.

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Various nondestructive testing (NDT) technologies for construction and performance monitoring have been studied for decades. Recently, the rapid evolution of wireless sensor network (WSN) technologies has enabled the development of sensors that can be embedded in concrete to monitor the structural health of infrastructure. Such sensors can be buried inside concrete and they can collect and report valuable volumetric data related to the health of a structure during and/or after construction. Wireless embedded sensors monitoring system is also a promising solution for decreasing the high install

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2

Saleh, Ghada. "RESOURCE ALLOCATION FOR OPTIMUM POWER USAGE IN WIRELESS NETWORKS." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429833200.

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3

Norring, Robert. "Optimum utilization of fission power with gas core reactors." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0004060.

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4

Parsa, Maryam. "Optimum Decision Policy for Gradual Replacement of Conventional Power Sources by Clean Power Sources." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24015.

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With the increase of world population and industrial growth of developing countries, demand for energy, in particular electric power, has gone up at an unprecedented rate over the last decades. To meet the demand, electric power generation by use of fossil fuel has increased enormously thereby producing increased quantity of greenhouse gases. This contributes more and more to atmospheric pollution, which climate scientists believe can adversly affect the global climate, as well as health and the welfare of the world population. In view of these issues, there is global awareness to look for alt

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5

Karaer, Arzu. "Optimum bit-by-bit power allocation for minimum distortion transmission." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4760.

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In this thesis, bit-by-bit power allocation in order to minimize mean-squared error (MSE) distortion of a basic communication system is studied. This communication system consists of a quantizer. There may or may not be a channel encoder and a Binary Phase Shift Keying (BPSK) modulator. In the quantizer, natural binary mapping is made. First, the case where there is no channel coding is considered. In the uncoded case, hard decision decoding is done at the receiver. It is seen that errors that occur in the more significant information bits contribute more to the distortion than less significan

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6

Yu, Wei. "Optimum power allocation in V-BLAST with high-level modulation." Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28161.

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Optimal ordering procedure, which is computationally complex in the conventional vertical Bell-labs layered space-time (V-BLAST) algorithm, can be simplified. Among those low-complexity alternatives to the optimal ordering, non-uniform power allocation is intuitively attractive. The unified analysis of power optimized zero forcing (ZF) VBLAST proposed by prior work ([32]) is extended from BPSK to high-level modulations (also known as high-order modulations) by introducing a generic SER approximation---average union bound (AUB)---for multi-path fading channels. This AUB model represents SER by

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7

Vrzic, Sophie. "Optimum capacity with linear power assignment for multimedia CDMA networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ61027.pdf.

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8

Yin, Wu. "Optimum power allocation for variable rate BLAST-MIMO MCCDMA systems." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433163.

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9

Aghaeimeybodi, Mehdi. "Optimum Prime Mover Sizing in Combined Heat and Power Systems." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10298.

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Combined heat and power (CHP) systems due to their high efficiency compared to the conventional power generation systems have received considerable attention as they have less harmful impact on the environment. Optimum selection of prime movers in CHP systems is of crucial importance due to the fact that inappropriate choices reduce the benefits of CHP systems considerably. In the selection procedure the performance characteristics of prime movers as well as economic parameters should be taken into consideration. As a variant of CHP systems, trigeneration systems are formed by adding an absorp

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10

Chew, W. M. "Optimum electromagnetic design for wound components in SMPS applications." Thesis, University of Bath, 1989. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328339.

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11

Cooper, Sean. "Control of a satellite based photovoltaic array for optimum power draw." Worcester, Mass. : Worcester Polytechnic Institute, 2008. http://www.wpi.edu/Pubs/ETD/Available/etd-042808-104913/.

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12

cooper, sean. "Control of a Satellite Based Photovoltaic Array for Optimum Power Draw." Digital WPI, 2008. https://digitalcommons.wpi.edu/etd-theses/414.

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This thesis analyzes the general performance and design requirements of photovoltaic(PV) systems, and specifically how they relate to the design of a system intended to supply power to a rotating satellite. The PV array geometry was discussed, different DC-DC converter topologies were analyzed, and optimum array geometry and converter topologies were determined. The potential reference quantities for use in control of the system are examined. Due to its comparably greater linearity with respect to changes in apparent load and its relative insensitivity to insolation changes, voltage was determ

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13

Kalinda, Mkenda Beatrice. "Essays on purchasing power parity, real exchange rate, and optimum currency areas /." Göteborg : Nationalekonomiska institutionen, Handelshögsk, 2000. http://www.handels.gu.se/epc/data/html/html/1973.html.

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14

Mortlock, Steven Peter. "Optimum time to refurbish a boiler feed pump at Eskom's power stations." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/8704.

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A key focus area in power generation today is to improve equipment and plant efficiency, with this study specifically aimed to determine the optimum time to refurbish a boiler feed pump by analysing the internal wear of the annular seals. The boiler feed pump (BFP) installed in a power station is either driven by a steam turbine or an electric motor and the BFP is the highest auxiliary power consumer within the power station. In the 13 Eskom generating fossil fired power stations the installed BFPs consume approximately 1000 MWs of auxiliary power continuously. The focus of the study is to und

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15

Lake, Jason Paul. "Establishing the optimum resistance training load for maximal gains in mechanical power output." Thesis, University of Chichester, 2010. http://eprints.chi.ac.uk/812/.

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The development of powerful muscle function is fundamental to the strength and conditioning process. Optimal load resistance training uses the load that maximises power output to more efficiently achieve this. However, research has shown that factors including measurement method and training status can significantly influence the optimal load. The five experimental studies of this thesis investigated these factors. First, the way in which the positive lifting phase is identified was examined to establish the underpinnings of ballistic resistance exercise preference over traditional alternative

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16

Chung, Tak Shing. "An integrated approach incorporating dynamic and static security limits in optimum power dispatch." Thesis, University of Strathclyde, 1993. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=20375.

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Optimum power dispatch is performed in a power system to determine the most economic power dispatch condition for a certain system loading. In this thesis the main focus is on the investigation of this problem and its improved application by including both dynamic security and static security limits in its solution. The aim is to develop an efficient and practical on-line method of optimum power dispatch with due regard to the necessary security requirements. A critical review of the current practices of security and optimization in power system operation shows that they are essential elements

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17

Yeago, Taylor Craig. "A Two-Phase Buck Converter with Optimum Phase Selection for Low Power Applications." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/51230.

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Power consumption of smart cameras varies significantly between sleep mode and active mode, and a smart camera operates in sleep mode for 80 — 90% of time for typical use. To prolong the battery life of smart cameras, it is essential to increase the power converter efficiency for light load, while being able to manage heavy load. The power stage of traditional buck converter is optimized for maximum load, at the cost of light-load efficiency. Wei proposed a multiphase buck converter incorporating the baby-buck concept and optimum number of phases (ONP) control. This thesis research investigate

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18

Alibakhshikenari, M., B. S. Virdee, L. Azpilicueta, et al. "Optimum power transfer in RF front end systems using adaptive impedance matching technique." Nature Publishing Group, 2021. http://hdl.handle.net/10454/18508.

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Yes<br>Matching the antenna’s impedance to the RF-front-end of a wireless communications system is challenging as the impedance varies with its surround environment. Autonomously matching the antenna to the RF-front-end is therefore essential to optimize power transfer and thereby maintain the antenna’s radiation efficiency. This paper presents a theoretical technique for automatically tuning an LC impedance matching network that compensates antenna mismatch presented to the RF-front-end. The proposed technique converges to a matching point without the need of complex mathematical modelling of

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19

Cai, Xinbo [Verfasser]. "Optimum Control of Electrical Drives and Power Converters : Computational Efficient Optimum Control for Three-Level-Inverters with DC-link Capacitance Balancing / Xinbo Cai." Düren : Shaker, 2021. http://d-nb.info/1233548417/34.

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20

Li, Xiying. "Linear Quadratic Tracking Optimum Controller Model Design to Optimize High Frequency Power Supply Performance." Youngstown State University / OhioLINK, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=ysu997902765.

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21

Ghazaany, Tahereh S., Raed A. Abd-Alhameed, Mark B. Child, N. T. Ali, Jonathan Rodriguez, and Abubakar S. Hussaini. "Optimum Design of Doherty RFPA for Mobile WiMAX Base Stations." Springer for the ICST, 2010. http://hdl.handle.net/10454/4484.

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Yes<br>RF power amplifiers in mobile WiMAX transceivers operate in an inherently nonlinear manner. It is possible to amplify the signal in the linear region, and avoid distortion, using output power back-off; however, this approach may suffer significant reduction in efficiency and power output. This paper investigates the use of Doherty techniques instead of back-off, to simultaneously achieve good efficiency and acceptable linearity. A 3.5 GHz Doherty RFPA has been designed and optimized using a large signal model simulation of the active device, and performance analysis under different driv

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22

Tadokoro, Yukihiro, Hiraku Okada, Takaya Yamazato, and Masaaki Katayama. "The Optimum Received Signal-Power Distribution for CDMA Packet Communication Systems Employing Successive Interference Cancellation." IEEE, 2004. http://hdl.handle.net/2237/7763.

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23

Gao, Shiyu. "Impact of Backreflections on Single-fiber Bidirectional Wavelength-Division-Multiplexing Passive Optical Networks (WDM-PONs)." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23762.

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With increased demand for bandwidth-hungry applications such as video-on-demand, wavelength-division-multiplexing passive optical network (WDM-PON) has become a strong contender in overcoming the last mile bottle neck. However, the wide-scale deployment of WDM-PONs has been delayed mainly due to the high cost of wavelength-specific optical components. To realize cost-effective WDM-PONs, various wavelength-independent, so called colorless architectures, have been developed so that all the subscribers can have identical optical network units (ONUs). In such WDM-PONs, however, single-fiber bidire

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Madaly, Kamalahasen. "Identifying the optimum storage capacity for a 100-MWe concentrating solar power plant in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86276.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: Central receiver power plants generate renewable electricity by exploiting the energy provided by the sun. The conditions experienced in the Northern Cape region of South Africa provide the ideal conditions for the development of these plants. Without a storage medium these plants have capacity factors in the range of 25-30%. The inclusion of a thermal energy storage medium provides the ability to increase the capacity factors of these plants. Although storage increases the costs, it results in better utilisation of the p

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Linus, Hansson. "Impact of Time-of-Delivery Schemes on Optimum Solar Hybrid Power Plants- A Techno-Economic Study." Thesis, KTH, Energiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193131.

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Analyses concerned with identifying optimal plant configurations of solar power plants can be expanded by implementing payment schemes where prices are unknown but daily occurring payment multipliers in the form of Time-of-Delivery (TOD) factors are known by enhancing the impact of financial conditions in optimal designs through the use of financial models. The hybridisation of solar technologies such as CSP with TES with photovoltaics (PV) and battery energy storage systems (BESS) have also been shown to offer promising synergies in terms of economy and design. The purpose of the present thes

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26

Dosti, E. (Endrit). "Ultra reliable communication via optimum power allocation for repetition and parallel coding in finite block-length." Master's thesis, University of Oulu, 2017. http://jultika.oulu.fi/Record/nbnfioulu-201706082640.

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Abstract. In this thesis we evaluate the performance of several retransmission mechanisms with ultra-reliability constraints. First, we show that achieving a very low packet outage probability by using an open loop setup is a difficult task. Thus, we resort to retransmission schemes as a solution for achieving the required low outage probabilities for ultra reliable communication. We analyze three retransmission protocols, namely Type-1 Automatic Repeat Request (ARQ), Chase Combining Hybrid ARQ (CC-HARQ) and Incremental Redundancy (IR) HARQ. For these protocols, we develop optimal power alloca

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Xu, Ke. "INTELLIGENT METHODS FOR OPTIMUM ONLINE ADAPTIVE COORDINATION OF OVERCURRENT RELAYS." UKnowledge, 2018. https://uknowledge.uky.edu/ece_etds/127.

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During the operation in a modern power distribution system, some abnormal events may happen, such as over-voltage, faults, under-frequency and overloading, and so on. These abnormal events may cause a power outage in a distribution system or damages on the equipment in a distribution system. Hence these abnormal events should be identified and isolated by protection systems as quickly as possible to make sure we can maintain a stable and reliable distribution system to supply adequate electric power to the largest number of consumers as we can. To sum up, we need stable and reliable protection

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Elsayed, Ahmed T. "Optimum Distribution System Architectures for Efficient Operation of Hybrid AC/DC Power Systems Involving Energy Storage and Pulsed Loads." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/3005.

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After more than a century of the ultimate dominance of AC in distribution systems, DC distribution is being re-considered. However, the advantages of AC systems cannot be omitted. This is mainly due to the cheap and efficient means of generation provided by the synchronous AC machines and voltage stepping up/down allowed by the AC transformers. As an intermediate solution, hybrid AC/DC distribution systems or microgrids are proposed. This hybridization of distribution systems, incorporation of heterogeneous mix of energy sources, and introducing Pulsed Power Loads (PPL) together add more compl

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Williams, G. J. "A survey of the wind energy resource of Cornwall to examine the influence of settlement patterns and topography on optimum wind turbine size and disposition." Thesis, Open University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235305.

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30

González, Juncà Arnau. "Combined heat and power generation systems for optimum environmental and economic performance : a case study in Catalonia." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/396270.

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In the current energy conjunction, with an expected growth of energy consumption in a context of fossil fuel depletion, more focus is being placed on renewable energy sources (RES) for electricity generation. To enhance their deployment worldwide, hybrid renewable energy systems (HRES) are a trendy alternative, because they can effectively take advantage of scalability and flexibility of these energy sources, since combining two or more allows counteracting the weaknesses of a stochastic renewable energy source with the strengths of another or with the predictability of a non-renewable energy

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Harman, John E. "Feasibility and optimum design study of a low speed wind turbine rotor system for underground communication power." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5688.

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Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains ix, 85 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 58-59).

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Roy, Indranil. "A NOVEL APPROACH FOR PLACING ACCESS POINTS IN AN ULTRA-DENSE 5G NETWORK WITH OPTIMUM POWER AND BANDWIDTH." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/theses/2303.

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In this paper we will consider the problem of optimally placing the access points (AP) in an ultra-dense 5G network which covers a rectangular region such that very point inside the rectangular region will be covered by at least one access point. We will analyze the sum of the total transmission power for all the access points and see how much wastage is there. We will measure the wastage in the transmission power by arranging the APs with touching and intersecting circles and try to minimize it with the factor that the whole area is covered. We will then propose a novel approach of placing th

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Gao, Zhao. "A Two-mode Buck Converter toward High Efficiency for the Entire Load Range for Low Power Applications." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/63928.

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In order to extend the battery life of smart cameras, it is essential to increase the efficiency of power converters, especially at light load. This thesis research investigated a power converter to supply power for the microprocessor of a smart camera. The input voltage of the converter is 5 V, and the output voltage is 1.2 V with the load ranging from 10 mA (12 mW) to 1200 mA (1440 mW). The conventional buck converter is typically optimized for high efficiency at maximum load at the cost of light-load efficiency. A converter is investigated in this thesis to improve light load efficiency, wh

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Yao, Yanmei. "Study of Induction Machines with Rotating Power Electronic Converter." Doctoral thesis, KTH, Elkraftteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196054.

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This thesis investigates a novel induction machine topology that uses a rotating power electronic converter. Steady-state and dynamic performance of the topology is studied to understand its operational principle. Furthermore the potential of improving its efficiency and power factor is investigated. The topology is referred to as wound rotor induction machine with rotating power electronic converter (WRIM-RPEC). The WRIM-RPEC topology offers the possibility to magnetize the induction machine from the rotor side by introducing a reactive voltage in the rotor. Thus, the power factor of the

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Mwakabuta, Ndaga Stanslaus. "Determination of optimum allocation and pricing of distributed generation using genetic algorithm methodology a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2008. http://proquest.umi.com/pqdweb?index=39&did=1605147581&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1254145368&clientId=28564.

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Shan, Mingwei. "Modeling and Control Strategy for Series Hydraulic Hybrid Vehicles." University of Toledo / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1260130398.

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Taran, Narges. "Optimum Design of Axial Flux PM Machines based on Electromagnetic 3D FEA." UKnowledge, 2019. https://uknowledge.uky.edu/ece_etds/145.

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Axial flux permanent magnet (AFPM) machines have recently attracted significant attention due to several reasons, such as their specific form factor, potentially higher torque density and lower losses, feasibility of increasing the number of poles, and facilitating innovative machine structures for emerging applications. One such machine design, which has promising, high efficiency particularly at higher speeds, is of the coreless AFPM type and has been studied in the dissertation together with more conventional AFPM topologies that employ a ferromagnetic core. A challenge in designing coreles

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Mahmoud, Thair. "Optimal power generation in microgrids using agent-based technology." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2013. https://ro.ecu.edu.au/theses/599.

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The existing power grids that form the basis of the respective electrical power infrastructures for various states and nations around the world, are expected to undergo a period of rapid change in the near future. The key element driving this change is the emergence of the Smartgrid. The Smartgrid paradigm represents a transition towards an intelligent, digitally enhanced, two-way power delivery grid. The aim of the Smartgrid is to promote and enhance the e_cient management and operation of the power generation and delivery facilities, by incorporating advanced communications, information tech

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Ibáñez, López A. Santiago (Antonio Santiago). "Analysis and modeling of Spain's power sector in order to define the best incentive policies for achieving an optimum energy mix." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81066.

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Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>The goal of this thesis is the development of a model of the Spanish energy mix in order to be able to forecast its evolution in function of exogenous variables such as the public opinion about specific technologies, the price of oil, the price of natural gas, the interest rate, etc. at a given moment in time. The development of such a model is interesting in order to set the right pOlicies and incentives for achieving a r

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Al, Osman Rida. "Development of "AlarmLocator" --- A computerized model for predicting the optimum number, location, and power level of acoustic warning devices in noisy work plants." Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27439.

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Acoustic warning signals are necessary to promptly alert workers of events which can compromise safety. Failure to react to warning signals can increase the risk of accidents in the workplace. Unfortunately, the use of warning signals in industry is poorly regulated and submitted to intuitive installation practices, often with little regard to the many factors contributing to an efficient use. This research presents the development of a new software tool called "AlarmLocator" to automate the process of installing auditory warning devices in a given setting, in terms of the characteristics of t

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Reed, R. J. "A mathematical model to determine optimum cadence for an individual cyclist using power output, heart rate and cadence data collected in the field." Thesis, University of Salford, 2013. http://usir.salford.ac.uk/30698/.

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We aim to develop a methodology to determine individual optimum cadences for competitive cyclists using field data. Cadence is the number of pedal crank revolutions per minute or pedalling rate. Currently athletes tend to select a cadence intuitively (choosing a gear that permits a cadence that feels comfortable), with some advice from coaches. Literature defines optimum cadence based on gross efficiency. However only power output, heart rate and cadence measurements from the field are available to us. Hence we determine an optimum cadence as the cadence that minimises heart rate for a given p

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Sanchez, Luis Carlos [UNESP]. "Proposta de um novo modelo matemático para gerenciamento ótimo de energia elétrica pelo lado do consumidor." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151629.

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Sanchez, Luis Carlos. "Proposta de um novo modelo matemático para gerenciamento ótimo de energia elétrica pelo lado do consumidor /." Ilha Solteira, 2017. http://hdl.handle.net/11449/151629.

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Orientador: Fábio Bertequini Leão<br>Resumo: No contexto de gestão e conservação de energia elétrica, ferramentas de apoio ao consumidor para gerenciar sua demanda são fundamentais para a otimização do uso dos recursos energéticos de modo a minimizar os custos com energia elétrica e ao mesmo tempo garantir o conforto do consumidor, considerando que este consumidor esteja inserido em um ambiente de Gerenciamento pelo Lado da Demanda (GLD). Assim, este trabalho propõe um novo modelo matemático de programação linear inteira mista (PLIM) para resolver o problema de gerenciamento ótimo de energia e

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Chang, Chin-Yao. "Hierarchical Control of Inverter-Based Microgrids." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471815065.

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Hussain, Nasir. "Cooperative communication in relay assisted wireless access networks." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/103528/1/Nasir_Hussain_Thesis.pdf.

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This research investigates the benefits of user cooperation in wireless communications systems. The dynamics of wireless cooperative communication systems are studied by a comprehensive study of two essential characteristics of cooperation, optimal relay selection criteria and practical channel estimation. A novel relay selection model based on realistic channel estimation is proposed and analysed. Furthermore, the gains are experimentally evaluated using a wireless communication testbed. The outcomes of this research reveal that incorporating cooperative techniques with an adaptive relay sele

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Lashway, Christopher R. "Resilient and Real-time Control for the Optimum Management of Hybrid Energy Storage Systems with Distributed Dynamic Demands." FIU Digital Commons, 2017. https://digitalcommons.fiu.edu/etd/3515.

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A continuous increase in demands from the utility grid and traction applications have steered public attention toward the integration of energy storage (ES) and hybrid ES (HESS) solutions. Modern technologies are no longer limited to batteries, but can include supercapacitors (SC) and flywheel electromechanical ES well. However, insufficient control and algorithms to monitor these devices can result in a wide range of operational issues. A modern day control platform must have a deep understanding of the source. In this dissertation, specialized modular Energy Storage Management Controllers (E

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Farias, Eder Jacques Porfirio. "AnÃlise de Sistemas OFDM Cooperativos AF com Amplificadores de PotÃncia NÃo Linearesâ." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10366.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Cooperation diversity and orthogonal frequency division multiplexing (OFDM) are two key technologies for the modern wireless communication systems. The cooperative communication systems considered through this work use the OFDM technology and they are composed of: one transmitter with a nonlinear power amplifier (PA), one or more amplify-and-forward (AF) relays, also having a nonlinear PAs, and one destination node. In this dissertaion, it is initially proposed an optimal receiver, in the signal to noise ratio (SNR) sense, for a no

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Ferreira, Ellen Cristina. "Fluxo de potência ótimo multiobjetivo com restrições de segurança e variáveis discretas." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-06072018-112756/.

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O presente trabalho visa a investigação e o desenvolvimento de estratégias de otimização contínua e discreta para problemas de Fluxo de Potência Ótimo com Restrições de Segurança (FPORS) Multiobjetivo, incorporando variáveis de controle associadas a taps de transformadores em fase, chaveamentos de bancos de capacitores e reatores shunt. Um modelo Problema de Otimização Multiobjetivo (POM) é formulado segundo a soma ponderada, cujos objetivos são a minimização de perdas ativas nas linhas de transmissão e de um termo adicional que proporciona uma maior margem de reativos ao sistema. Investiga-se

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Nabawy, Mostafa. "Design of insect-scale flapping wing vehicles." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/design-of-insectscale-flapping-wing-vehicles(5720b8af-a755-4c54-beb6-ba6ef1a13168).html.

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This thesis contributes to the state of the art in integrated design of insect-scale piezoelectric actuated flapping wing vehicles through the development of novel theoretical models for flapping wing aerodynamics and piezoelectric actuator dynamics, and integration of these models into a closed form design process. A comprehensive literature review of available engineered designs of miniature rotary and flapping wing vehicles is provided. A novel taxonomy based on wing and actuator kinematics is proposed as an effective means of classifying the large variation of vehicle configurations curren

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Bukhsh, Waqquas Ahmed. "Islanding model for preventing wide-area blackouts and the issue of local solutions of the optimal power flow problem." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9671.

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Optimization plays a central role in the control and operation of electricity power networks. In this thesis we focus on two very important optimization problems in power systems. The first is the optimal power flow problem (OPF). This is an old and well-known nonconvex optimization problem in power system. The existence of local solutions of OPF has been a question of interest for decades. Both local and global solution techniques have been put forward to solve OPF problem but without any documented cases of local solutions. We have produced test cases of power networks with local solutions a

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