Tesis sobre el tema "Energy Packet"
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Nilsson, Samuel y Joakim Eriksson. "Estimating Application Energy Consumption Through Packet Trace Analysis". Thesis, Linköpings universitet, Institutionen för datavetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-110348.
Texto completoSanjuan, Joseba. "3G Energy-Efficient Packet Handling Kernel Module for Android". Thesis, Linköpings universitet, Institutionen för datavetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-84507.
Texto completoOto, Mert Can. "Energy-efficient Packet Size Optimization For Cognitive Radio Sensor Networks". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613040/index.pdf.
Texto completoMobin, Iftekharul. "Energy efficient packet size optimization for wireless ad hoc networks". Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8769.
Texto completoKassab, Hisham Ibrahim. "low-energy mobile packet radio networks : routing, scheduling, and architecture". Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9121.
Texto completoIncludes bibliographical references (leaves 171-176).
Packet Radio Networks (PRNETs), which are also called ad-hoc networks, have the capability of fast (and ad-hoc) deployment and set-up, and therefore potentially have several useful civilian and military applications. Building low-energy PRNETs is an important design goal, because the communication devices are typically powered by batteries, and therefore are useless when the batteries are depleted. We choose to look at low-energy PRNETs by focusing on the problem of minimum-energy communication over a PRNET, resolving any related issues or design decisions in a manner consistent with the overall goal of low-energy PRNETs. We conclude that the problem of minimum-energy communication over a PRNET is really a joint routing-scheduling-topological problem. We find the joint problem to be intractable, and therefore propose to solve it by decomposing it, solving each component separately. The resulting solution is not optimal but the degree of suboptimality depends on how the problem is decomposed. Therefore we compare different decomposition methods, and select the one that is likely to yield the best solution to the joint problem. After deciding how to decompose the joint problem, we study the separate components. For the topological problem we decide that nodes should communicate with a limited number of other nodes, referred to as neighbors. We also propose and analyze the performance of a procedure for managing the set of neighbors. For the scheduling problem, we propose a novel and practical class of scheduling algorithms. The routing problem is more complex than wireline routing because of interference and fading. When they are incorporated, routing becomes a non-convex problem; and we overcome this by a novel approach that is non-optimal, but is more robust than the optimal approach.
by Hisham Ibrahim Kassab.
Ph.D.
Reza, C. M. F. S. "Design of Energy Mixer and Router for DC Power Packet Distribution System". Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/20137.
Texto completoMorfopoulou, Christina. "Queuing analysis and optimization techniques for energy efficiency in packet networks". Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11681.
Texto completoEriksson, Daniel y Axel Persson. "Energy Optimization of Scheduling and Packet Loss in Wireless Sensor Networks". Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214699.
Texto completoSachdeva, Gitanjali. "Measuring and Optimizing Energy Efficiency in Internet Communication : Implementing a Packet-Level Energy Model for Content Delivery Networks". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for telematikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22693.
Texto completoNawata, Shinya. "Design of Electrical Energy Network Based on Power Packetization". 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225598.
Texto completoBaek, Seong Cheol. "Dynamical Analysis and Decentralized Control of Power Packet Network". Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263664.
Texto completoPrevedi, Andrea. "Energy Communities in Italy". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21973/.
Texto completoMostowfi, Mehrgan. "Packet Coalescing and Server Substitution for Energy-Proportional Operation of Network Links and Data Servers". Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4732.
Texto completoErkal, Hakan. "Optimization Of Energy Harvesting Wireless Communication Systems". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613937/index.pdf.
Texto completoAjibesin, Adeyemi Abel. "Novel approaches to performance evaluation and benchmarking for energy-efficient multicast: empirical study of coded packet wireless networks". Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20323.
Texto completoOzcelik, Fatih Mehmet. "Optimal And Implementable Transmission Schemes For Energy Harvesting Networks". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614636/index.pdf.
Texto completoPhan, V. V. (Vinh V. ). "Smart packet access and call admission control for efficient resource management in advanced wireless networks". Doctoral thesis, University of Oulu, 2005. http://urn.fi/urn:isbn:9514276779.
Texto completoBacinoglu, 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.
Texto completoGuegan, Loic. "Scalable end-to-end models for the time and energy performance of Fog infrastructures". Thesis, Rennes, École normale supérieure, 2021. http://www.theses.fr/2021ENSR0025.
Texto completoFog Computing designates the migration of the computing and storage resources of the Cloud towards the edge of thenetwork. This resources migration allows to reduce the user’s nodes latency to answer to the evolution of the Internet usages. In parallel, the number of terminal is increasing with the development of the Internet Of Things. This infrastructures growth leads to an increase of the global energy consumption related to network infrastructures. However, this energy consumption is distributed and involved many actors such as: connected objects, local network, Internet Service Providers, Fog and Cloud infrastructures. Thus, it is difficult to study the impact of the connected objects growth on the infrastructures that composed the Internet of Things. The goal of this thesis is to propose models to study the energy consumption of large-scale Fog infrastructures in an efficient and reproducible manner. The proposed models have been integrated in the SimGrid simulation framework in order to be validated and spread
Suciu, Ioana. "Energy aware optimization for low power radio technologies". Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/668889.
Texto completoEl crecimiento significativo de la IoT está empujando al mercado hacia el desarrollo de dispositivos de bajo coste, de muy bajo consumo energético y con un fuerte enfoque en la miniaturización, para aplicaciones que requieran sensores corporales, monitoreo de salud personal y micro-robots. La investigación en el campo de la eficiencia energética en la IoT propone soluciones que van desde la optimización de la capa física hasta la capa de red. Este trabajo se centra en explorar nuevas técnicas para mejorar la eficiencia energética y la experiencia del usuario de las redes IoT. Dividimos las técnicas propuestas en técnicas de optimización de nivel de trama de red y chip, respectivamente. Si bien las técnicas de nivel de trama están destinadas a mejorar el rendimiento de las tecnologías de radio existentes, las técnicas de nivel de chip tienen como objetivo reemplazarlas por arquitecturas que no requieren de cristales. Las técnicas de nivel de trama desarrolladas en este trabajo son el uso de autenticación de preámbulos y fragmentación de paquetes, aconsejables para redes LPWAN, una tecnología que ofrece un menor consumo de energía por servicio prestado, pero es vulnerable frente a los ataques de agotamiento de energía y no escalan frente la densificación. El uso de preámbulos autenticados entre los sensores y las pasarelas de enlace se convierte en un mecanismo de defensa contra el agotamiento del batería previsto por los atacantes. Demostramos experimentalmente que este enfoque puede reducir con un 91% el efecto de un ataque de agotamiento, aumentando la vida útil del dispositivo de menos de 0.24 años a 2.6 años. Los experimentos se llevaron a cabo utilizando nodos sensores de detección de carga, utilizados comercialmente para el control y monitoreo de infrastructura crítica. Aunque la técnica se ejemplifica en el estándar LoRaWAN, el uso de autenticación de preámbulo es extensible a cualquier protocolo inalámbrico. En esta tesis se muestra también que el uso de la fragmentación de paquetes a pesar de que el paquete se ajuste a la trama, reduce la probabilidad de colisiones mientras aumenta el número de usuarios en una red con restricciones de ciclos de transmisión. Mediante el uso de simulaciones en Matlab, se obtiene una mejora importante en el rendimiento de la red con la fragmentación, con un mayor impacto en redes más lentas y densas. Usando simulaciones NS3, demostramos que combinar la fragmentación de paquetes con el NACK en grupo se puede aumentar la confiabilidad de la red, al tiempo que se reduce la energía consumida para las retransmisiones, a costa de agregar pequeños encabezados a cada fragmento. Como técnica de nivel de chip, consideramos el uso de radios para la comunicación que no usan referencias de frecuencia externas como los osciladores basados en un cristal. Esto permitiría tener todos los elementos del sensor en una sola pieza de silicio, lo que lo hace incluso diez veces más eficiente energéticamente debido a la integración del chip. La consecuencia inmediata, en el uso de osciladores digitales en vez de cristales, es la pérdida de precisión de la comunicación y la capacidad de cambiar fácilmente los canales de comunicación. En este sentido, proponemos una secuencia de algoritmos y fases de sincronización de frecuencia que deben ser respetados por un dispositivo sin cristales para que pueda unirse a una red al encontrar el canal de baliza, sintetizar todos los canales de comunicación y luego mantener su precisión contra el cambio de temperatura. Los algoritmos propuestos no necesitan una sobrecarga de red adicional, ya que están utilizando la señalización de red existente. La evaluación se realiza en simulaciones y experimentalmente en una implementación prototipo de una radio sin cristal IEEE802.15.4. Los resultados obtenidos experimentalmente muestran una precisión inicial ligeramente superior a 40 ppm, que luego será corregida por el chip para que sea inferior a 40 ppm.
Mostowfi, Mehrgan. "Improving the Energy Efficiency of IEEE 802.3az EEE and Periodically Paused Switched Ethernet". Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3623.
Texto completoAntepli, Mehmet Akif. "A Study On Certain Theoretical And Practical Problems In Wireless Networks". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612603/index.pdf.
Texto completoHaneberg-Diggs, Dominique Miguel. "Seismic attributes of the Clinton interval reservoir in the Dominion East Ohio Gabor gas storage field near North Canton, Ohio". Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1418759184.
Texto completoSamoud, Wiem. "Analyse de performance d'un commutateur de paquets hybride opto-électronique". Thesis, Paris, ENST, 2016. http://www.theses.fr/2016ENST0058/document.
Texto completoMost transmission systems are based on optical fibers, carrying the traffic at a relatively low energy per bit. However, due to the lack of mature optical buffers, packet switching is still performed electrically. The required Optical-Electrical-Optical (O-E-O) conversions make the switching one of the areas with the fastest-growing energy consumption. A major challenge that must be met in designing future optical networks is curbing their energy consumption. Therefore, within this thesis, we investigate a hybrid optoelectronic switch which consists of an optical switching matrix supplemented with a shared electronic buffer. Performance analysis taking into account different classes of service, packet classifications and switch connectivity methods (WDM and/or SDM channels), shows that, thanks to the established switching strategies, the hybrid switch satisfies the requirements of all the different classes of service in terms of Packet Loss Rate, sustainable system load and latency. Moreover, it significantly reduces the O-E-O conversions compared to commercial off-the-shelf electrical switches, since they occur only for buffered packets. We defend that the hybrid opto-electronic packet switch meets the requirements on quality of service and could be a promising solution to reduce the energy consumption of optical networks
Chibumba, Aubrey Muyeke. "Characterisation of thermal coefficients in packed beds". Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303543.
Texto completoHall, Stephen. "Optimisation of biogas production from percolating packed bed anaerobic digesters". Thesis, University of South Wales, 1986. https://pure.southwales.ac.uk/en/studentthesis/optimisation-of-biogas-production-from-percolating-packed-bed-anaerobic-digesters(6825c6bf-4ee7-439e-832a-28aa8b7cd4d3).html.
Texto completoAbou-Ziyan, H. Z. Z. "Heat and momentum transfer in porous material used for thermal energy storage". Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233826.
Texto completoEdwards, Jacob N. "Thermal energy storage for nuclear power applications". Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/36238.
Texto completoDepartment of Mechanical and Nuclear Engineering
Hitesh Bindra
Storing excess thermal energy in a storage media that can later be extracted during peak-load times is one of the better economical options for nuclear power in future. Thermal energy storage integration with light water-cooled and advanced nuclear power plants is analyzed to assess technical feasibility of different storage media options. Various choices are considered in this study; molten salts, synthetic heat transfer fluids, and packed beds of solid rocks or ceramics. In-depth quantitative assessment of these integration possibilities are then analyzed using exergy analysis and energy density models. The exergy efficiency of thermal energy storage systems is quantified based on second law thermodynamics. The packed bed of solid rocks is identified as one of the only options which can be integrated with upcoming small modular reactors. Directly storing thermal energy from saturated steam into packed bed of rocks is a very complex physical process due to phase transformation, two phase flow in irregular geometries and percolating irregular condensate flow. In order to examine the integrated physical aspects of this process, the energy transport during direct steam injection and condensation in the dry cold randomly packed bed of spherical alumina particles was experimentally and theoretically studied. This experimental setup ensures controlled condensation process without introducing significant changes in the thermal state or material characteristics of heat sink. Steam fronts at different flow rates were introduced in a cylindrical packed bed and thermal response of the media was observed. The governing heat transfer modes in the media are completely dependent upon the rate of steam injection into the system. A distinct differentiation between the effects of heat conduction and advection in the bed were observed with slower steam injection rates. A phenomenological semi-analytical model is developed for predicting quantitative thermal behavior of the packed bed and understanding physics. The semi-analytical model results are compared with the experimental data for the validation purposes. The steam condensation process in packed beds is very stable under all circumstances and there is no effect of flow fluctuations on thermal stratification in packed beds. With these experimental and analytical studies, it can be concluded that packed beds have potential for thermal storage applications with steam as heat transfer fluid. The stable stratification and condensation process in packed beds led to design of a novel passive safety heat removal system for advanced boiling water reactors.
Maidadi, Mohaman Bello. "Packed-bed rock thermal energy storage for concetrated solar power: enhancement of storage time and system efficiency". Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020914.
Texto completoAllen, Kenneth Guy. "Performance characteristics of packed bed thermal energy storage for solar thermal power plants". Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4329.
Texto completoENGLISH ABSTRACT: Solar energy is by far the greatest energy resource available to generate power. One of the difficulties of using solar energy is that it is not available 24 hours per day - some form of storage is required if electricity generation at night or during cloudy periods is necessary. If a combined cycle power plant is used to obtain higher efficiencies, and reduce the cost of electricity, storage will allow the secondary cycle to operate independently of the primary cycle. This study focuses on the use of packed beds of rock or slag, with air as a heat transfer medium, to store thermal energy in a solar thermal power plant at temperatures sufficiently high for a Rankine steam cycle. Experimental tests were done in a packed bed test section to determine the validity of existing equations and models for predicting the pressure drop and fluid temperatures during charging and discharging. Three different sets of rocks were tested, and the average size, specific heat capacity and density of each set were measured. Rock and slag samples were also thermally cycled between average temperatures of 30 ºC and 510 ºC in an oven. The classical pressure drop equation significantly under-predicts the pressure drop at particle Reynolds numbers lower than 3500. It appears that the pressure drop through a packed bed is proportional to the 1.8th power of the air flow speed at particle Reynolds numbers above about 500. The Effectiveness-NTU model combined with a variety of heat transfer correlations is able to predict the air temperature trend over the bed within 15 % of the measured temperature drop over the packed bed. Dolerite and granite rocks were also thermally cycled 125 times in an oven without breaking apart, and may be suitable for use as thermal storage media at temperatures of approximately 500 ºC. The required volume of a packed bed of 0.1 m particles to store the thermal energy from the exhaust of a 100 MWe gas turbine operating for 8 hours is predicted to be 24 × 103 m3, which should be sufficient to run a 25-30 MWe steam cycle for over 10 hours. This storage volume is of a similar magnitude to existing molten salt thermal storage.
AFRIKAANSE OPSOMMING: Sonenergie is die grootste energiebron wat gebruik kan word vir krag opwekking. ‘n Probleem met die gebruik van sonenergie is dat die son nie 24 uur per dag skyn nie. Dit is dus nodig om die energie te stoor indien dit nodig sal wees om elektrisiteit te genereer wanneer die son nie skyn nie. ‘n Gekombineerde kringloop kan gebruik word om ‘n hoër benuttingsgraad te bereik en elektrisiteit goedkoper te maak. Dit sal dan moontlik wees om die termiese energie uit die primêre kringloop te stoor, wat die sekondêre kringloop onafhanklik van die primêre kringloop sal maak. Dié gevalle studie ondersoek die gebruik van ‘n slakof- klipbed met lug as hitteoordragmedium, om te bepaal of dit moontlik is om hitte te stoor teen ‘n temperatuur wat hoog genoeg is om ‘n Rankine stoom kringloop te bedryf. Eksperimentele toetse is in ‘n toets-bed gedoen en die drukverandering oor die bed en die lug temperatuur is gemeet en vergelyk met voorspelde waardes van vergelykings en modelle in die literatuur. Drie soorte klippe was getoets. Die gemiddelde grootte, spesifieke hitte-kapasiteit en digtheid van elke soort klip is gemeet. Klip en slak monsters is ook siklies tussen temperature van 30 ºC en 510 ºC verkoel en verhit. Die klassieke drukverlies vergelyking gee laer waardes as wat gemeet is vir Reynolds nommers minder as 3500. Dit blyk dat die drukverlies deur ‘n klipbed afhanklik is van die lug vloeispoed tot die mag 1.8 as die Reynolds nommer groter as omtrent 500 is. Die ‘Effectiveness-NTU’ model gekombineerd met ‘n verskeidenheid van hitteoordragskoeffisiënte voorspel temperature binne 15 % van die gemete temperatuur verskil oor die bed. Doloriet en graniet klippe het 125 sikliese toetse ondergaan sonder om te breek, en is miskien gepas vir gebruik in ‘n klipbed by temperature van sowat 500 ºC Die voorspelde volume van ‘n klipbed wat uit 0.1 m klippe bestaan wat die termiese energie vir 8 ure uit die uitlaat van ‘n 100 MWe gasturbiene kan stoor, is 24 × 103 m3. Dit behoort genoeg te wees om ‘n 25 – 30 MWe stoom kringloop vir ten minste 10 ure te bedryf. Die volume is min of meer gelyk aan dié van gesmelte sout store wat alreeds gebou is.
Bang, Jang Young. "Generalized uncertainty principle and Gaussian wave packets in discrete quantum phase space". [Bloomington, Ind.] : Indiana University, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3380062.
Texto completoTitle from PDF t.p. (viewed on Jul 19, 2010). Source: Dissertation Abstracts International, Volume: 70-12, Section: B, page: 7630. Adviser: Micheal S. Berger.
Yeboah, Siegfried Kwame. "An integrated packed bed-oscillating heat pipe system for energy efficient isothermal adsorption processes". Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/48342/.
Texto completoGrüner, Barbara, Martin Schlesinger, Philipp Heister, Walter T. Strunz, Frank Stienkemeier y Marcel Mudrich. "Vibrational relaxation and dephasing of Rb2 attached to helium nanodroplets". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138750.
Texto completoDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
Krist, Thomas. "Optimalizace zásobníku tepla typu "packed bed"". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417062.
Texto completoRohrdanz, Mary A. "Intermolecular communication via lattice phonons, probed by ultrafast spectroscopy /". view abstract or download file of text, 2005. http://wwwlib.umi.com/cr/uoregon/fullcit?p3190543.
Texto completoTypescript. Includes vita and abstract. Includes bibliographical references (leaves 79-80). Also available for download via the World Wide Web; free to University of Oregon users.
Gamble, Stephanie Nicole. "Conical Intersections and Avoided Crossings of Electronic Energy Levels". Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/101899.
Texto completoDoctor of Philosophy
We study energies of molecular systems in which special circumstances occur. In particular, when these energies intersect, or come close to intersecting. These phenomena give rise to unique physics which allows special reactions to occur and are thus of interest to study. We study one example of a more specific type of energy level crossing and avoided crossing, and then consider another type of crossing in a more general setting. We find solutions for these systems to draw our results from.
Grüner, Barbara, Martin Schlesinger, Philipp Heister, Walter T. Strunz, Frank Stienkemeier y Marcel Mudrich. "Vibrational relaxation and dephasing of Rb2 attached to helium nanodroplets". Royal Society of Chemistry, 2011. https://tud.qucosa.de/id/qucosa%3A27778.
Texto completoDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
Al-Chalaby, K. A. J. "Heat transfer in a packed bed using a fluid near its critical point for solar energy applications". Thesis, University of Sussex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377058.
Texto completoAlam, Tanvir E. "Experimental Investigation of Encapsulated Phase Change Materials for Thermal Energy Storage". Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5632.
Texto completoRashidian, Babak. "Deflector effects in fixed bed (biomass) combustors and non-combusting packed beds". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2016. https://ro.ecu.edu.au/theses/1937.
Texto completoNyman, Johan y Amy Rankka. "Energy Efficient, Electric-Hydraulic Power Pack". Thesis, Linköpings universitet, Fordonssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-119477.
Texto completoPrenzel, Marco [Verfasser]. "Scale-up of horizontal packed bed thermal energy storage units: An in-depth experimental and numerical investigation / Marco Prenzel". Düren : Shaker, 2021. http://d-nb.info/1233548050/34.
Texto completoDiego, García Ramón Ignacio. "Análisis wavelet aplicado a la medida de armónicos, interarmónicos y subarmónicos en redes de distribución de energía eléctrica". Doctoral thesis, Universidad de Cantabria, 2006. http://hdl.handle.net/10803/10636.
Texto completoFourier analysis is the fundamental method for the measurement of harmonics and interharmonics in electrical power systems and is the method proposed by the International Electrotechnical Commission (IEC) for standard measurement instruments. With the objective of overcoming the limitations in certain conditions, other techniques of analysis such as wavelets have been proposed. This doctoral thesis investigates alternatives in the field of the quality of the provision of electrical energy. The main contribution of this thesis is the proposal of a new method of measurement of harmonics and interharmonics based on the Wavelet Packet Transform compatible with the standard IEC 61000-4-7 of 2002. The method proposed simultaneously uses different levels of the same wavelet decomposition tree for the measurement of harmonic, interharmonic and subharmonic components in the input signal as well as their time evolution.The basic characteristics of the method in terms of the choice of the mother wavelet function, the bank of filters that implements the wavelet decomposition tree and the postprocessing to make the method compatible with the measurement standard are explained. The benefits of the method in the measurement of harmonics and interharmonics are analyzed, both in stationary conditions and in the case of loss of synchrony due to variation of the base frequency or variation of the sampling window of the signal, presence of nonsynchronous components with the frequency of the network or presence of components of variable amplitude. Finally, the information that the method provides about the temporal estimation of the measured frequencial components is described.The method developed and the IEC method have been implemented on a virtual instrument. The hardware used and the software developed are explained studying the performance of the instrument under different measurement conditions.Finally the conclusions obtained are summarized and future lines of investigation motivated by this doctoral thesis are proposed.
Bäckebo, Markus. "The influence of particle size distribution on bio-coal gasification rate as related to packed beds of particles". Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-79084.
Texto completoCongiu, Brian Alexander. "Conversion of Carbon Dioxide and Hydrogen into Methane in Bench-scale Microcosms and Packed Column Reactors". Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1292783980.
Texto completoThomson, Sean Richard. "Methane Production by a Packed-Bed Anaerobic Digester Fed Dairy Barn Flush Water". DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1329.
Texto completoTrahan, Jamie. "A Technical and Economic Comparative Analysis of Sensible and Latent Heat Packed Bed Storage Systems for Concentrating Solar Thermal Power Plants". Scholar Commons, 2015. https://scholarcommons.usf.edu/etd/5598.
Texto completoRocco, Arthur Betti. "Processo decisório da União Europeia : um estudo sobre o Pacote Clima-Energia 2020". reponame:Repositório Institucional da UnB, 2017. http://repositorio.unb.br/handle/10482/24230.
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O objetivo geral desta dissertação é analisar como os diversos interesses no processo que formulou o Pacote Clima/Energia 2020 da União Europeia (UE) foram promovidos. As metas específicas são: identificar se houve ou não promoção dos interesses nacionais por meio da atuação dos comissários, descrever o processo decisório, analisar a atuação dos atores subnacionais e não estatais, e avaliar a consecução das metas postas para 2020. Este estudo concluiu que não há evidências, durante a elaboração do Pacote Clima/Energia 2020, da promoção de interesses nacionais pelos comissários. Observou-se uma dinâmica contínua de debates entre as instituições participes do processo de codecisão, fato que gera diversas janelas de oportunidades para promoção dos mais diversos interesses. Neste sentindo, o principal foco de promoção dos interesses foram os europarlamentares, relatores do Pacote Legislativo. Quanto à análise dos dados quantitativos da implementação das metas postas para 2020, inferiu-se que as metas de redução de 20% dos índices de emissão – tendo 1990 como ano base –, de inserção de 20% de fontes renováveis na matriz energética e de economia de 20% de energia por meio do incremento da eficiência energética poderiam ser mais audaciosas, uma vez que a crise internacional colaborou, em grande medida, para que essas fossem alcançadas. A forte contração das economias europeias, que se traduziu na redução do consumo, implicou na redução da produção e, consequentemente, reduziram-se o consumo de energia e os níveis de emissão de gases com efeito estufa.
This Master’s Thesis seeks to analyze how different interests were promoted during the process that led to the approval of the 2020 Climate & Energy Package in the European Union (EU). The specific aims of this thesis are to identify if national interests were pursued through the action of European commissaries, to describe the decision-making process, to analyze the performance by subnational and non-state actors and to examine the implementation of the targets set to 2020. This thesis concludes that there were no evidences that commissaries promoted national interests the conception of the 2020 Climate & Energy Package. There was observed a dynamic impetus of debates among the participant institutions of the co-decision process, which created several opportunity windows to the promotion of numerous interests. The main actors who promoted specific interests were the members of the European Parliament. Based on the quantitative analysis of the data regarding implementation of the 2020 targets, it is inferred that their three pillars – 20% cut in greenhouse gases emissions, based on 1990 levels, 20% European Union energy from renewables and 20% improvement in energy efficiency – could have been more ambitious, since the international economic crisis has been responsible, to a great extent, to the attainment of these goals. The decrease in consumption, caused by the strong recession of the European economies, led to a decrease in production, which, by its turn, provoked a slump in energy consumption levels as well as in greenhouse gases emission levels.
Thiem, Stefanie. "Electronic and Photonic Properties of Metallic-Mean Quasiperiodic Systems". Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-83831.
Texto completoEine der elementaren Fragen der Physik kondensierter Materie beschäftigt sich mit dem Zusammenhang zwischen der atomaren Struktur und den physikalischen Eigenschaften von Materialien. Eine Forschungslinie in diesem Kontext begann mit der Entdeckung der Quasikristalle durch Shechtman et al. 1982. Es stellte sich bald heraus, dass diese Materialien mit ihren laut der klassischen Kristallographie verbotenen 5-, 8-, 10- oder 12-zähligen Rotationssymmetrien durch mathematische Modelle für die aperiodische Pflasterung der Ebene beschrieben werden können, die durch Penrose und Ammann in den 1970er Jahren vorgeschlagen wurden. Aufgrund der fehlenden Translationssymmetrie in Quasikristallen sind bis heute nur endliche, relativ kleine Systeme oder periodische Approximanten durch numerische Berechnungen untersucht worden und theoretische Ergebnisse wurden hauptsächlich für eindimensionale Systeme gewonnen. In dieser Arbeit werden d-dimensionale quasiperiodische Modelle, sogenannte Labyrinth-Pflasterungen, mit separablem Hamilton-Operator im Modell starker Bindung betrachtet. Diese Methode erlaubt es, quantenmechanische Lösungen in höheren Dimensionen direkt aus den eindimensionalen Ergebnissen abzuleiten und ermöglicht somit die Untersuchung von sehr großen Systemen in zwei und drei Dimensionen mit bis zu 10^10 Gitterpunkten. Insbesondere betrachten wir dabei quasiperiodische Folgen mit metallischem Schnitt. Basierend auf diesem Modell befassen wir uns im Speziellen mit den elektronischen Eigenschaften der Quasikristalle im Hinblick auf die Verbindung der spektralen und dynamischen Eigenschaften des Hamilton-Operators. Hierfür untersuchen wir die Eigenschaften der Eigenzustände und Wellenfunktionen und vergleichen diese mit der Dynamik von Wellenpaketen in den Labyrinth-Pflasterungen basierend auf numerischen Berechnungen und einem Renormierungsgruppen-Ansatz in Verbindung mit Störungstheorie. Dabei stellt sich heraus, dass viele Eigenschaften wie etwa das Skalenverhalten der Partizipationszahlen und der mittleren quadratischen Abweichung eines Wellenpakets für verschiedene Dimensionen ein qualitativ gleiches Verhalten zeigen oder sogar unabhängig von der Dimension sind. Zudem zeigen wir, dass die Struktur der Labyrinth-Pflasterungen und deren Transporteigenschaften sowie bestimmte Momente der spektralen Dimensionen und die Dynamik der Wellenpakete in Beziehung zueinander stehen. Darüber hinaus werden auch die photonischen Eigenschaften für eindimensionale quasiperiodische Mehrschichtsysteme für beliebige Einfallswinkel untersucht und der Verlauf der Transmissionsbänder mit der quasiperiodischen Struktur in Zusammenhang gebracht
Falola, Bamidele Daniel. "TRANSITION METAL COATINGS FOR ENERGY CONVERSION AND STORAGE; ELECTROCHEMICAL AND HIGH TEMPERATURE APPLICATIONS". OpenSIUC, 2017. https://opensiuc.lib.siu.edu/dissertations/1354.
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