Teses / dissertações sobre o tema "Stange energi"
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An, Anastasiia. "Early Design Stage Energy Optimization of Bysjöstrand Ecovillage, Sweden". Thesis, Högskolan Dalarna, Energiteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:du-34786.
Texto completo da fonteWalsh, Daniel. "Fully sustainable energy module - Stage 1: Source research and development". Thesis, Walsh, Daniel (2014) Fully sustainable energy module - Stage 1: Source research and development. Other thesis, Murdoch University, 2014. https://researchrepository.murdoch.edu.au/id/eprint/24193/.
Texto completo da fonteAtenas, Maldonado Felipe Eduardo. "A two-stage model for planning energy investment under uncertainty". Tesis, Universidad de Chile, 2019. http://repositorio.uchile.cl/handle/2250/170925.
Texto completo da fonteMemoria para optar al título de Ingeniero Civil Matemático
We consider risk-averse stochastic programming models for the Generation Expansion Planning problem for energy systems with here-and-now investment decisions and generation variables of recourse. The resulting problem is coupled both along scenarios and along power plants. We develop a new decomposition technique to solve the energy optimization problem, resulting from the combination of two existing procedures, one to deal with stochastic programming problems through decomposition for different realizations of the stochastic process representing the uncertain data, and the second one is a method aim to find solutions to nonsmooth optimization problems. More precisely, we combine the Progressive Hedging algorithm to deal with scenario separability, obtaining a separate subproblem for each scenario, and an inexact proximal bundle method to handle separability for different power plants in each subproblem. By suitably combining these approaches, if the evaluation errors of the proximal bundle method vanish asymptotically, then bundle method converges to an approximate solution to each scenario subproblem. Thus, under mild convexity assumptions, the Progressive Hedging algorithm generates a sequence that converges to a solution to the original problem. The methodology is satisfactorily assessed on a test instance of the Generation Expansion Planning problem, whose reduced size allows us to compare the results with those obtained when solving the problem directly, and without decomposition.
CONICYT-PFCHA/Magister Nacional/2018-22181067 y CMM Conicyt PIA AFB170001
Hopf, Konstantin [Verfasser], e Thorsten [Akademischer Betreuer] Staake. "Predictive Analytics for Energy Efficiency and Energy Retailing / Konstantin Hopf ; Betreuer: Thorsten Staake". Bamberg : University of Bamberg Press, 2019. http://d-nb.info/1191183580/34.
Texto completo da fonteHelminiak, Nathaniel Steven. "Construction and characterization of a single stage dual diaphragm gas gun". Thesis, Marquette University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10641398.
Texto completo da fonteIn the interest of studying the propagation of shock waves, this work sets out to design, construct, and characterize a pneumatic accelerator that performs high-velocity flyer plate impact tests. A single stage gas gun with a dual diaphragm breach allows for a non-volatile, reliable experimental testing platform for shock phenomena. This remotely operated gas gun utilizes compressed nitrogen to launch projectiles down a 14 foot long, 2 inch diameter bore barrel, which subsequently impacts a target material of interest. A dual diaphragm firing mechanism allows the 4.5 liter breech to reach a total pressure differential of 10ksi before accelerating projectiles to velocities as high as 1,000 m/s (1570-2240 mph). The projectile’s velocity is measured using a series of break pin circuits. The target response can be measured with Photon Doppler Velocimetry (PDV) and/or stress gauge system. A vacuum system eliminates the need for pressure relief in front of the projectile, while additionally allowing the system to remain closed over the entire firing cycle. Characterization of the system will allow for projectile speed to be estimated prior to launching based on initial breach pressure.
Lattová, Jana. "Rola obnoviteľných zdrojov energie v regionálnom a municipálnom rozvoji so zameraním na bioplynové stanice". Master's thesis, Vysoká škola ekonomická v Praze, 2012. http://www.nusl.cz/ntk/nusl-125113.
Texto completo da fonteKudličková, Monika. "Design dobíjecí stanice pro elektromobily". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401507.
Texto completo da fonteLi, Beidi. "Use of Building Energy Simulation Software in Early-Stage of Design Process". Thesis, KTH, Byggvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217902.
Texto completo da fonteWei, Quantum Jichi. "Two-stage reverse osmosis : optimal element configuration and flux distribution, energy savings". Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111900.
Texto completo da fonteCataloged from PDF version of thesis.
Includes bibliographical references (pages 57-59).
In a two-stage reverse osmosis (RO) system of finite size, there are two degrees of freedom not present in a single-stage RO system: distribution of RO elements between the two stages (system design), and feed pressures (system operation). In this study, we investigate the optimal system design and operation of a two-stage RO system with a mass-balance model and establish a lower bound for the energy savings achieved by the optimized two-stage system compared to a single-stage system. A two-stage RO system may consume more or less energy than a single-stage RO system of the same size and freshwater productivity, depending on the first-stage feed pressure and second-stage feed pressure. To minimize energy consumption, feed pressures should be chosen to minimize spatial variance in flux. The optimal element configuration places at least half the elements in the first stage; the exact configuration depends on feed salinity, recovery ratio, and membrane permeability. The greatest energy savings are achieved with a two-stage RO system that has both optimal element configuration and feed pressures. More energy can be saved by adding a stage when the thermodynamic least work of separation is larger. For a given feed salinity, energy savings from adding a second stage grow as recovery ratio increases. Brackish water feeds must be taken to high recovery ratios to achieve substantial energy savings; comparable savings can be achieved at lower recovery ratios for higher salinity feeds. We find that significant energy can be saved with the simplest two-stage RO design, at a system flux similar to today's RO plants and accounting for the effects of concentration polarization.
by Quantum J. Wei.
S.M.
Zhao, Zheng. "High Efficiency Single-stage Grid-tied PV Inverter for Renewable Energy System". Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/27520.
Texto completo da fontePh. D.
Castleton, Holly. "Assessment of design stage energy prediction models for low carbon office buildings". Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/6676/.
Texto completo da fontePellegrino, Filippo. "An early-stage energetic and environmental analysis for the new district of Jakobsgårdarna in Borlänge, Sweden". Thesis, Högskolan Dalarna, Energiteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:du-34915.
Texto completo da fonteSheline, William Robert. "Concentrated solar chemistry: design stage theoretical thermodynamic analysis of an iron-ethylene production process". Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51757.
Texto completo da fonteBaltierrez, Jason. "Multiple Input, Single Output DC-DC Conversion Stage for DC House". DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2028.
Texto completo da fonteRodier, Quentin. "Paramétrisation de la turbulence atmosphérique dans la couche limite stable". Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30343/document.
Texto completo da fonteThe modeling of the stable atmospheric boundary layer is one of the current challenge faced by weather and climate models. The stable boundary layer is a key for the prediction of fog, surface frost, temperature inversion, low-level jet and pollution peaks. Furthermore, polar regions, where stable boundary layer predominates, are one of the region with the largest temperature rise : the stable boundary layer modeling is crucial for the reduction of the spread of climate predictions. Since more than 15 years, the GABLS models intercomparison exercices have shown that turbulent mixing in the stable boundary layer is overestimated by numerical weather prediction models. Numerous models artificially strengthen the activity of their turbulence scheme to avoid a laminarization of the flow at a critical value of the gradient Richardson number. The existence of this threshold is only a theoretical and a numerical issues. Numerous observations and high-resolution numerical simulations do not support this concept and show two different regimes : the weakly stable boundary layer that is continuously and strongly turbulent; and the very stable boundary layer globally intermittent with a highly anisotropic and very weak turbulence. This thesis aims at improving the turbulence scheme within the atmospheric research model Méso-NH developped by Météo-France and the Laboratoire d'Aérologie, and the operational weather forecast model AROME. We use a traditional methodology based on the comparison of high-resolution simulations that dynamically resolve the most energetic turbulent eddies (Large-Eddy Simulations) to single-column simulations. Several LES covering the weakly and the very stable boundary layer were performed with Méso-NH. The limits of applicability of LES in stratified conditions are documented. The first part of the study deals with the overmixing in the weakly stable boundary layer. We propose a new diagnostic formulation for the mixing length which is a key parameter for turbulence schemes based on a prognostic equation for the turbulent kinetic energy. The new formulation adds a local vertical wind shear term to a non-local buoyancy-based mixing length currently used in Méso-NH and in the French operational model AROME. The new scheme is evaluated first in single-column simulations with Méso-NH and compared to LES, and then in the AROME model with respect to observations collected from the operational network of Météo-France. The second part presents a theoretical and numerical evaluation of a turbulence scheme based on two prognostic equations for the turbulent kinetic and potentiel energies. In stratified conditions, the heat flux contributes to the production of turbulent potential energy. The laminarization of the flow is then limited by a reduction of the destruction of the turbulent kinetic energy by a better representation of the anisotropy and a counter-gradient term in the heat flux. On the simulated cases, this new formulation behaves similarly than the scheme with one equation for the turbulent kinetic energy because the self-preservation mechanism is not dominant compared to the dissipation term. Further research should improve the turbulent kinetic energy dissipation closure in the very stable regime
Freemantle, Erika Brita Leah. "The oxidation of energy substrates during healthy aging". Mémoire, Université de Sherbrooke, 2007. http://savoirs.usherbrooke.ca/handle/11143/3921.
Texto completo da fonteYang, Guangyuan. "The Energy Goodness-of-fit Test for Univariate Stable Distributions". Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339476355.
Texto completo da fonteAbi, Sejaan Georgina. "Energy harvesting and storage in multi-stable micro-actuator systems". Electronic Thesis or Diss., Compiègne, 2022. http://www.theses.fr/2022COMP2698.
Texto completo da fonteThe principle of energy harvesting is applied in this thesis to a wireless bistable micro-actuator system, developed in the Roberval laboratory. The bistable micro-actuator is made up of an antagonistic pre-shaped double beams, two shape memory alloy (SMA) elements and a laser source. The laser beam is used as a contactless energy transfer source to actuate the SMA elements. At their turn, SMA elements are the transitional components to activate the bistable beams among its two stable positions. From this context, the aim of this thesis is to harvest different types of unused available energies in this system. To start with, optical energy is harvested using the photovoltaic effect transforming optical energy into electrical energy. Moreover, due to the environment heating, the difference in temperature is harvested using thermoelectric effect transforming this difference in temperature into a voltage difference. The overall objective is to create two different playgrounds of energy harvesting in the system. The first one relies on harvesting only the optical energy. This design will be used when the micro-actuator requires an additional electrical energy without requiring high speed of actuation. However, when the speed represents a priority comparing to the electrical energy in demand, the micro-actuator switches to operate in the second playground where optical and thermal energies are harvested while the speed of actuation of the micro-actuator is higher than the first design
Poehls, Lennart Bertram. "Energy assessment in early architectural design stages : framework and validation methodology for architect-friendly computacional energy assessment". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/173694.
Texto completo da fonteToday’s buildings are responsible for about 40% of the global energy demand. To reduce energy consumption by using Energy Assessment (EA) methods, the Early Architectural Design Stages (EADS) are especially suitable to implement the best cost-benefit measures. To integrate EA into EADS, two main challenges must be simultaneously tackled: (a) the architect-(un)friendliness of computational models and (b) the results’ reliability. To accomplish both goals a Framework for Energy Assessment Tools in Early Architectural Design Stages (FORwArDS) and a validation methodology, Relative Validation (RV), is presented. FORwArDS feature three components: Input Model, Assessment Model, and Output Model, but focuses on the creation of a Simplified Input Model (SIM) throughout parameters reduction, the creation of alternative values for the chosen parameters and exemplary mathematical and geometrical simplification steps. In the case study, a SIM is created according to the exemplary simplification rules described in FORwArDS, springing from a detailed project model; a validation procedure follows the proposed methodology. The results are presented, analyzed and conclusions are drawn regarding the framework’s and validation methodology’s contributions to the improvement of the EADS. The framework’s open structure and the applicability of the validation methodology to any simulation contribute to the discussion about the integration problems of energy assessment in EADS and present useful tools for the creation and test of model simplification methodologies and EA for architects during EADS.
Urban, Bryan J. (Bryan James). "The MIT Design Advisor : simple and rapid energy simulation of early-stage building designs". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42032.
Texto completo da fonteThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 173-177).
Simulation tools, when applied early in the design process, can considerably reduce the energy demand of newly constructed buildings. For a simulation tool to assist with design, it must be easy to use, provide feedback quickly, and allow rapid comparisons. Most existing tools do not meet these needs, usually because they were intended for modeling finalized building designs. Often there is no user interface, and it can take hours or days to prepare, run, and interpret results. Such tools are too sophisticated for design purposes. In this document the MIT Design Advisor is presented as a simple and rapid building energy simulation tool, developed specifically for architects and building designers. Conceptual building designs can be modeled quickly and without formal training. Results are interpreted graphically and displayed to the user in a simple user interface. Side-by-side comparisons of building designs can be made, allowing users to quickly learn which building components have the biggest impact on energy consumption (heating, cooling, and lighting), indoor daylight levels, and thermal comfort. User-specified building parameters are used together with local weather data to predict monthly and annual energy use. The heat transfer model used to make the energy predictions is explained in detail in this thesis. Calculation methods are given and validated. Agreement with existing models is quite good. The MIT Design Advisor is available at http://designadvisor.mit.edu.
by Bryan J. Urban.
S.M.
Kim, Rae-Young. "Improved renewable energy power system using a generalized control structure for two-stage power converters". Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/28932.
Texto completo da fontePh. D.
Fenchel, Juergen. "Stable, distributed real-time scheduling of flexible manufacturing systems : an energy approach". Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/16774.
Texto completo da fonteMandelbaum, Andrew (Andrew Joseph). "Improvements to building energy usage modeling during early design stages and retrofits". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92195.
Texto completo da fonteCataloged from PDF version of thesis.
Includes bibliographical references (pages 104-108).
A variety of improvements to the MIT Design Advisor, a whole-building energy usage modeling tool intended for use during early design stages, are investigated. These include changes to the thermal mass temperature distribution and lighting requirement calculations, the formulation of a representative day scheme to reduce the number of days that need to be simulated to find energy usage for a full year, the creation of an optimization algorithm to allow users to improve on their designs, and the addition of an algorithm to predict potential savings from retrocommissioning (RCx) using a limited set of simple inputs. Design Advisor itself is also tested for usability, speed, and accuracy using three existing buildings. The frequency of thermal mass-related calculations is reduced by finding the limits of the semi-implicit Crank-Nicolson method before it begins to return physically implausible oscillatory temperature profiles. An effort is made to speed up lighting calculations using a multivariate regression analysis in place of a multiple-reflection-based illuminance model. Representative days are formed by creating an average and two extreme weather days per month using existing climatological data, reducing the number of simulated days per year from 365 to 72 (three per month, repeated once for training). Combined, these changes lead to reductions in run time of up to 50% with roughly 10% loss of accuracy. The optimizer leverages these run time improvements to rapidly find optimal building designs given a set of input constraints. Initially, a multistep multivariate regression is used to reduce the given search space and tighten the constraints. Then, a genetic algorithm is used to find the target solution. Initial tests of this combination have led to average reductions in energy usage of 25% given 6 minutes of calculation. To extend Design Advisor's applicability to existing buildings, an algorithm for predicting potential energy savings from RCx is implemented and tested. A database of 90 buildings that have undergone an RCx process and had their resulting energy savings documented has been collected. A k-nearest neighbors algorithm is used to evaluate the potential savings of test buildings based on this data set, operating on the assumption that similar buildings (in terms of location, size, and energy usage intensity) will present similar faults or opportunities for savings. While the average savings percentage prediction error is 0.02, the root-mean-square error is 12.4, which is greater than the actual savings potential of many buildings. Model validation is performed using three existing buildings; two in the Philadelphia area and one on MIT's campus. For energy types for which no building faults or other issues were later found (as in the MIT building), final usage predictions are found to be accurate to within a mean bias error of 11.2% to 2.6%. To improve upon these accuracies, further details about key building parameters and modes of operation would be required. These studies also inform further usability improvements, including reporting site (rather than primary) energy usage and expending reported electricity usage to include loads other than lighting.
by Andrew Mandelbaum.
S.M.
Nielsen, Jens Munk. "Species interactions and energy transfer in aquatic food webs". Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-123600.
Texto completo da fonteAt the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 4: Manuscript.
Estep, Gregory Dale. "The influence of extrusion processing and formulation on form-stable phase change material". Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Thesis/Summer2010/g_estep_062110.pdf.
Texto completo da fonteTitle from PDF title page (viewed on July 28, 2010). "Department of Civil and Environmental Engineering." Includes bibliographical references (p. 24-26).
Gohardani, Navid. "Promotion of sustainable renovation in the built environment : An early stage techno-economic approach". Licentiate thesis, KTH, Byggnadsteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102475.
Texto completo da fonteQC 20120918
Papastergiou, Konstantinos. "A power converter with a rotating secondary stage for an airborne radar system". Thesis, University of Edinburgh, 2006. http://hdl.handle.net/1842/1984.
Texto completo da fonteZemanová, Pavlína. "Hodnocení ekonomické efektivnosti investice - bioplynová stanice". Master's thesis, Vysoká škola ekonomická v Praze, 2010. http://www.nusl.cz/ntk/nusl-150160.
Texto completo da fonteBombíková, Kamila. "Podnikatelský záměr". Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2011. http://www.nusl.cz/ntk/nusl-223292.
Texto completo da fonteQian, Feng. "Piezoelectric Energy Harvesting for Powering Wireless Monitoring Systems". Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/99156.
Texto completo da fonteDoctor of Philosophy
Wireless monitoring systems with embedded wireless sensor nodes have been widely applied in human health care, structural health monitoring, home security, environment assessment, and wild animal tracking. One distinctive advantage of wireless monitoring systems is to provide unremitting, wireless monitoring of interesting parameters, and data transmission for timely decision making. However, most of these systems are powered by traditional batteries with finite energy capacity, which need periodic replacement or recharge, resulting in high maintenance costs, interruption of service, and potential environmental pollution. On the other hand, abundant energy in different forms such as solar, wind, heat, and vibrations, diffusely exists in ambient environments surrounding wireless monitoring systems which would be otherwise wasted could be converted into usable electricity by proper energy transduction mechanisms. Energy harvesting, also referred to as energy scavenging and energy conversion, is a technology that uses different energy transduction mechanisms, including electromagnetic, photovoltaic, piezoelectric, electrostatic, triboelectric, and thermoelectric, to convert ambient energy into electricity. Compared with traditional batteries, energy harvesting could provide a continuous and sustainable power supply or directly recharge storage devices like batteries and capacitors without interrupting operation. Among these energy transduction mechanisms, piezoelectric materials have been extensively explored for small-size and low-power generation due to their merits of easy shaping, high energy density, flexible design, and low maintenance cost. Piezoelectric transducers convert mechanical energy induced by dynamic strain into electrical charges through the piezoelectric effect. This dissertation presents novel piezoelectric energy harvesters, including design, modeling, prototyping, and experimental tests for energy harvesting from human walking, broadband bi-stable nonlinear vibrations, and torsional vibrations for powering wireless monitoring systems. A piezoelectric footwear energy harvester is developed and embedded inside a shoe heel for scavenging energy from heel striking during human walking to provide a power supply for wearable sensors embedded in health monitoring systems. The footwear energy harvester consists of multiple piezoelectric stacks, force amplifiers, and two heel-shaped metal plates taking dynamic forces at the heel. The force amplifiers are designed and optimized to redirect and amplify the dynamic force transferred from the heel-shaped plates and then applied to the inner piezoelectric stacks for large power output. An analytical model and a finite model were developed to simulate the electromechanical responses of the harvester. The footwear harvester was tested on a treadmill under different walking speeds to validate the numerical models and evaluate the energy generation performance. An average power output of 9.3 mW/shoe and a peak power output of 84.8 mW are experimentally achieved at the walking speed of 3.0 mph (4.8 km/h). A two-stage force amplifier is designed later to improve the power output further. The dynamic force at the heel is amplified twice by the two-stage force amplifiers before applied to the piezoelectric stacks. An average power output of 34.3 mW and a peak power output of 110.2 mW were obtained from the harvester with the two-stage force amplifiers. A bio-inspired bi-stable piezoelectric energy harvester is designed, prototyped, and tested to harvest energy from broadband vibrations induced by animal motions and fluid flowing for the potential applications of self-powered fish telemetry tags and bird tags. The harvester consists of a piezoelectric macro fiber composite (MFC) transducer, a tip mass, and two sub-beams constrained at the free ends by in-plane pre-displacement, which bends and twists the two sub-beams and consequently creates curvatures in both length and width directions. The bi-direction curvature design makes the cantilever beam have two stable states and one unstable state, which is inspired by the Venus flytrap that could rapidly change its leaves from the open state to the close state to trap agile insects. This rapid shape transition of the Venus flytrap, similar to the vibration of the harvester from one stable state to the other, is accompanied by a large energy release that could be harvested. Detailed design steps and principles are introduced, and a prototype is fabricated to demonstrate and validate the concept. The energy harvesting performance of the harvester is evaluated at different excitation levels. Finally, a piezoelectric energy harvester is developed, analytically modeled, and validated for harvesting energy from the rotation of an oil drilling shaft to seek a continuous power supply for downhole sensors in oil drilling monitoring systems. The position of the piezoelectric transducer on the surface of the shaft is parameterized by two variables that are optimized to obtain the maximum power output. Approximate expressions of voltage and power of the torsional vibration piezoelectric energy harvester are derived from the theoretical model. The implicit relationship between the power output and the two position parameters of the transducer is revealed and physically interpreted based on the approximate power expression. Those findings offer a good reference for the practical design of the torsional vibration energy harvesting system.
Vaňorek, Tomáš. "Návrh systému odměňování ve společnosti BGS Energy plus,a.s". Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2011. http://www.nusl.cz/ntk/nusl-222893.
Texto completo da fonteLeone, Robert Matthew. "Machine learning multi-stage classification and regression in the search for vector-like quarks and the Neyman construction in signal searches". Thesis, The University of Arizona, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10247665.
Texto completo da fonteA search for vector-like quarks (VLQs) decaying to a Z boson using multi-stage machine learning was compared to a search using a standard square cuts search strategy. VLQs are predicted by several new theories beyond the Standard Model. The searches used 20.3 inverse femtobarns of proton-proton collisions at a center-of-mass energy of 8 TeV collected with the ATLAS detector in 2012 at the CERN Large Hadron Collider. CLs upper limits on production cross sections of vector-like top and bottom quarks were computed for VLQs produced singly or in pairs, Tsingle, Bsingle, Tpair, and Bpair. The two stage machine learning classification search strategy did not provide any improvement over the standard square cuts strategy, but for Tpair, B pair, and Tsingle, a third stage of machine learning regression was able to lower the upper limits of high signal masses by as much as 50%. Additionally, new test statistics were developed for use in the Neyman construction of confidence regions in order to address deficiencies in current frequentist methods, such as the generation of empty set confidence intervals. A new method for treating nuisance parameters was also developed that may provide better coverage properties than current methods used in particle searches. Finally, significance ratio functions were derived that allow a more nuanced interpretation of the evidence provided by measurements than is given by confidence intervals alone.
Givens, David Ian. "The effect of growth stage and season on the prediction of the metabolisable energy content of herbage". Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315596.
Texto completo da fonteAcevedo, Echeverría Giancarlo Andrés. "Dealing with the risk of a policy change: a multi-stage expansion planning for the energy sector". Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/137406.
Texto completo da fonteIngeniero Civil Matemático
Se presenta un modelo para diseñar un plan de acción para la generación eléctrica que incorpora futuro riesgo de cambio en la política de energía renovable. El modelo permite un plan en múltiples etapas, en donde algunas decisiones pueden ser tomadas hoy y otras pospuestas al futuro, cuando la incerteza de un cambio de política es revelada. El modelo es lo suficientemente flexible para considerar diversas potenciales medidas de energías renovables, las cuales pueden ser implementadas por medio de penaltis, impuestos a la emisión de carbono, subsidios u otros. El modelo es resuelto por medio de una descomposición tipo Benders para poder lidiar con un problema de altas dimensiones como la planificación eléctrica de un país. Se muestra que la planificación en múltiples etapas muestras mejorías substanciales en términos de costos y reducción de riesgo. El modelo es implementado para el SIC (Sistema Interconectado Central de Chile), para 2 etapas o años objetivos, 2025 y 2035, en que se elaboraron 3 casos, el primero en el cual no hay cambios en políticas de energía renovable, el segundo en el cual desde el año 2035 hay un chance de que se imponga una política de impuesto a las emisiones de carbono y finalmente, el último caso en que en el año 2035 se impone una política de 33% de generación mínima renovable no convencional. Para los 3 casos mencionados anteriormente se tienen distintos portafolios energéticos, donde se puede apreciar el efecto que tiene cada cambio de política para el sistema de generación eléctrica de un país.
Nahodil, Jiří. "Zvýšení výroby elektrické energie na BPS pomocí parního motoru". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230379.
Texto completo da fonteNeuwirth, Zdeněk. "Simulátor pro ověření funkce bezpečnostních pásů". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228668.
Texto completo da fontePaterson, Greig. "Real-time energy use predictions at the early architectural design stages with machine learning". Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1553395/.
Texto completo da fonteSampathnarayanan, Balaji. "Analysis and Design of Stable and Optimal Energy Management Strategies for Hybrid Electric Vehicles". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1357079732.
Texto completo da fonteWishart, Cornelia. "Measurement of total body water (TBW) and total energy expenditure (TEE) using stable isotopes". Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/44135/1/Cornelia_Wishart_Thesis.pdf.
Texto completo da fonteChandra, S. "Chemically stable, crystalline, porous covalent organic frameworks as proton transport and energy storage materials". Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2017. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3920.
Texto completo da fonteNyberg, Christoffer. "Metabolic and Endocrine Response in the Acute Stage of Subarachnoid Hemorrhage". Doctoral thesis, Uppsala universitet, Neurokirurgi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-328121.
Texto completo da fonteYao, Xiahui. "The Material Design of Stable Cathodes in Li-Oxygen Batteries and Beyond". Thesis, Boston College, 2017. http://hdl.handle.net/2345/bc-ir:107563.
Texto completo da fonteNon-aqueous Li-O2 batteries promise the highest theoretical specific energy among all rechargeable batteries. It is the only candidate that can be comparable with the internal combustion engine in terms of gravimetric energy density. This makes Li-O2 batteries preferable in the application of electric vehicles or drones. However, the materialization of this technology has been hindered by the poor cycling performance. The major reason for the degradation of the battery at the current research stage has been identified as the decomposition of the electrolyte and the cathode. These parasitic reactions will lower the yield of the desired product and induce huge overpotential during the recharge process. By carefully examining the degradation mechanism, we have identified the reactive oxygen species as the culprit that will corrode the cathode and attack the organic solvents. While parallel efforts have been devoted to reduce the reactivity of these species toward electrolyte, the main focus of this thesis is to identify suitable material platforms that can provide optimum performance and stability as cathodes. A bio-inspired wood-derived N-doped carbon is first introduced to demonstrate the benefit of hierarchical pore structures for Li-O2 cathodes. But the instability of the carbon cathode itself limits the lifetime of the battery. To improve the stability of carbon, we further introduce a catalytic active surface coating of FeOx on a three dimensionally ordered mesoporous carbon. The isolation of carbon from the reactive intermediates greatly improves the stability of the cathode. Yet the imperfections of the protection layer on carbon calls for a stable substrate that can replace carbon. TiSi2 is explored as the candidate. With the decoration of Pd catalysts, the Pd/TiSi2 cathode can provide extraordinary stability toward reactive oxygen species. But this composite cathode suffers from the detachment of the Pd catalyst. A Co3O4 surface layer is further introduced to enhance the adhesion of the catalyst, which doubles the lifetime of the cathode. To achieve a fully stable cathode, Ru catalyst with stronger adhesion on TiSi2 directly is explored and identified to be robust in the operating conditions of Li-O2 batteries. The expedition for stable cathodes in Li-O2 batteries is expected to provide a clean material platform. This platform can simplify the study in evaluating the effectiveness of catalysts, the reaction mechanism at the cathode and the stability of the electrolyte. Toward the end of this thesis, an exploration is made to enable rechargeable Mg metal battery with a conversion Br2 cathode. This new system can avoid the dendritic growth of Li metal by the adoption of Mg as the anode and can promise better cathode kinetics by forming a soluble discharge product
Thesis (PhD) — Boston College, 2017
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Chemistry
Biel, Konstantin [Verfasser], Christoph [Akademischer Betreuer] Glock e Anne [Akademischer Betreuer] Lange. "Multi-stage production planning with special consideration of energy supply and demand / Konstantin Biel ; Christoph Glock, Anne Lange". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2017. http://d-nb.info/1147968519/34.
Texto completo da fonteSvärd, Magnus. "Stable High-Order Finite Difference Methods for Aerodynamics". Doctoral thesis, Uppsala universitet, Avdelningen för teknisk databehandling, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4621.
Texto completo da fonteAlismail, Ayman [Verfasser], e Ferenc [Akademischer Betreuer] Krausz. "Multi-octave, CEP-stable source for high-energy field synthesis / Ayman Alismail ; Betreuer: Ferenc Krausz". München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1205665234/34.
Texto completo da fonteWOLLNER, Antonín. "Využití kukuřice pro energetické účely". Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-80215.
Texto completo da fonteVOBORSKÁ, Petra. "Bioplynové stanice - forma obnovitelných zdrojů energie". Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-175748.
Texto completo da fonteRahul, Eppa. "Energy Efficient Stable Cluster Scheme for MANET". Thesis, 2015. http://ethesis.nitrkl.ac.in/7452/1/2015_Energy_Rahul.pdf.
Texto completo da fonteKuo, Yeong Chau, e 郭永超. "Design and implementation of single stage photovoltaic energy conversion system". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/07693979424730909919.
Texto completo da fonte國立成功大學
電機工程學系
89
As opposed to conventional two-stage designs, a single stage photovoltaic (PV) energy conversion system is implemented, resulting in size and weight reduction and increased efficiency. The nonlinear output power relation of versus and the near linear relation of versus are discussed. Using as an index for current control is easier than voltage control, allowing a simpler design. The proposed current controller allows a PV energy conversion system to track the maximum power point very rapidly and smoothly. In addition, single current loop controller simplifies the conventional double loop design. The proposed controller performs maximum power point tracking (MPPT) and provides power to utilities with a unity power factor. Further, the proposed controller architecture is employed to the single-phase three-wire photovoltaic energy conversion system. The proposed system employs a three-leg inverter to control the MPPT process, the line current and neutral line current. A neutral line mode controller maintains a utility neutral line current to be zero. A line mode controller controls the line current so as to provide power to the utility with a unity power factor. The proposed system acts as a solar generator on sunny days and functions as an active power filter on rainy or cloudy days. In this thesis, the voltage and current hybrid PWM inverters using fuzzy variable structure control technique is proposed for parallel operation. The voltage-controlled PWM inverter (VCPI) unit is developed to provide a specific sinusoidal output voltage and the current-controlled PWM inverter (CCPI) units are employed to track the distributive current. Each of the VCPI and CCPI units can be operated independently. By using the fuzzy variable structure control scheme, the parallel inverters can provide excellent performance without phase-lock-loop (PLL) circuit for synchronization. The proposed scheme can result in fast dynamic response and robustness to parameter variations. Finally, computer simulations and experimental results demonstrate the superior performance of the proposed technique.
Tsai, Chih-Ta, e 蔡知達. "Controller IC Design for Single-stage Photovoltaic Energy Conversion System". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/07653297544789224625.
Texto completo da fonte國立成功大學
電機工程學系碩博士班
93
In this thesis, a controller IC of signal-stage photovoltaic energy conversion system is designed by cell-based IC design flow. The advantages of the study are to reduce the circuit volume and to finish a SoC (System on Chip) product. In this study, the Verilog HDL code is written, then the code is downloaded into FPGA (Field Programmable Gate Array) chip in order to verify the functions. After the grammar and functions are corrected, the prototype chip is finished by TSMC 0.35 Cell-based Design Flow. Both the stand-alone mode and the utility mode are employed into the controller chip. The system is developed to provide the 110V/60Hz sinusoidal output voltage by voltage-controlled mode and deliver real power to the load. The excess power is supported to utility line with nearly unity power factor by current-controlled mode. Finally, experimental results of the 1kW PV energy conversion system are performed to verify the FPGA functions and simulation results of EDA (Electronic Design Automation) tool are executed to demonstrate the design of digital controller chip.