Tesis sobre el tema "Acive Flux"
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PESCETTO, PAOLO. "Sensorless Commissioning and Control of High Anisotropy Synchronous Motor Drives". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2730183.
Texto completoMacTaggart, David. "Theoretical magnetic flux emergence". Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1692.
Texto completoBrandt, Lundqvist Olof. "Construction of an Active Rectifier for a Transverse-Flux Wave Power Generator". Thesis, KTH, Elkraftteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215635.
Texto completoVågkraft är en energikälla som skulle kunna göra en avgörande skillnad i omställningenmot en hållbar energisektor. Tillväxten för vågkraft har dock intevarit lika snabb som tillväxten för andra förnybara energislag, såsom vindkraftoch solkraft. Vissa tekniska hinder kvarstår innan ett stort genombrott för vågkraftkan bli möjligt. Ett hinder fram tills nu har varit de låga spänningarna ochde resulterande höga effektförlusterna i många vågkraftverk. En ny typ av vågkraftsgenerator,som har tagits fram av Anders Hagnestål vid KTH i Stockholm,avser att lösa dessa problem. I det här examensarbetet behandlas det effektelektroniskaomvandlingssystemet för Anders Hagneståls generator. Det beskriverplanerings- och konstruktionsprocessen för en enfasig AC/DC-omvandlare, somså småningom skall bli en del av det större omvandlingssystemet för generatorn.Ett kontrollsystem för omvandlaren, baserat på hystereskontroll för strömmen,planeras och sätts ihop. Den färdiga enfasomvandlaren visar goda resultat underdrift som växelriktare. Dock kvarstår visst konstruktionsarbete och viss kalibreringav det digitala kontrollsystemet innan omvandlaren kan användas för sinuppgift i effektomvandlingen hos vågkraftverket.
Kwong, Lian Elizabeth. "A novel approach to estimate active carbon flux using the micronekton biomass spectra". Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59702.
Texto completoScience, Faculty of
Graduate
Kail, Maximilian M. [Verfasser]. "Direct Flux Control for High-Power Active Front Ends with Low Switching Frequency / Maximilian M Kail". Aachen : Shaker, 2003. http://d-nb.info/1170544517/34.
Texto completoRomary, Raphaël. "Modélisation de la machine synchrone à concentration de flux : application à la réduction active des vibrations". Lille 1, 1995. http://www.theses.fr/1995LIL10031.
Texto completoGeorge, Tyrel Daniel Frank. "Design and testing of long-lifetime active sensor arrays for in-core multi-dimensional flux measurements". Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/35229.
Texto completoDepartment of Mechanical and Nuclear Engineering
Douglas S. McGregor
Fission chambers are a common type of detector used to determine the neutron flux and power of a nuclear reactor. Due to the limited space and high neutron flux in a reactor core, it is difficult to perform real-time flux measurements with present-day in-core instrumentation. Micro-pocket fission detectors, or MPFDs, are relatively small in size and have low neutron sensitivity while retaining a large neutron to gamma ray discrimination ratio, thereby, allowing them to be used as active neutron flux monitors inside a nuclear reactor core. The micro-pocket fission chamber allows for multiple detectors to be inserted into a flux port or other available openings within the nuclear reactor core. Any material used to construct the MPFD must be rugged and capable of sustaining radiation damage for long periods of time. Each calibrated MPFD provides measurements of the flux for a discrete location. The size of these detectors allows for a spatial map of the flux to be developed, enabling real-time analysis of core burnup, power peaking, and rod shadowing. Small diameter thermocouples can be included with the array to also measure the temperature at each location. The following document details the research and development of MPFDs for long term use in nuclear power reactors. Previous MPFD designs were improved, miniaturized, and optimized for long term operations in reactor test ports designed for passive measurements of fluence using iron wires. Detector chambers with dimensions of 0.08 in x 0.06 in x 0.04 in were attached to a common cathode and individual anodes to construct an array of the MPFDs. Each array was tested at the Kansas State University TRIGA Mark II nuclear reactor to demonstrate functionality. The linear response in reactor power was measured. These arrays have also demonstrated reactor power tracking by following reactivity changes in steady state operations and reactor pulsing events. Stability testing showed consistent operation at 100 kW for several hours. The MPFDs have been demonstrated to be a viable technology for in-core measurements.
Wilson, Brian Christopher David. "Control Designs for Low-Loss Active Magnetic Bearing: Theory and Implementation". Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-04122004-133631/unrestricted/wilson%5Fbrian%5Fc%5F200405%5Fphd.pdf.
Texto completoHabetler, Thomas, Committee Member ; Sadegh Nader, Committee Member ; Taylor David, Committee Member ; Tsiotras Panagiotis, Committee Co-Chair ; Heck-Ferri Bonnie, Committee Co-Chair. Vita. Includes bibliographical references (leaves 319-326).
Ishii, Takako. "Relation between Emergence of Twisted Magnetic Flux Bundle and Flare Activities in Active Regions on the Sun". 京都大学 (Kyoto University), 2000. http://hdl.handle.net/2433/181118.
Texto completoTakasao, Shinsuke. "Fundamental Magnetohydrodynamic Processes of Solar Flares: Formation of Flare-productive Regions and Evolution of Flare Loops". 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215316.
Texto completoChaffar, Khaled. "Thermographie active appliquée à la caractérisation in situ de parois de bâtiment". Thesis, Artois, 2012. http://www.theses.fr/2012ARTO0204/document.
Texto completoCurrent environmental concerns are intended to reduce energy consumption. In a process of improving existing buildings, the study of the thermal behavior of a wall is not easy because of the ignorance of its real thermophysical properties. These parameters are yet to dominate the economic optimization phase of the rehabilitation or to check its performance in situ. It therefore appears important to characterize the walls of existing building. Our work aims to develop a method of thermal characterization of a wall suitable for in situ applications based on an active approach. The principle of identification is to apply a heat-face access by imposing a heat flux in the form of a pulse and to study the temperature response recorded by infrared thermography on the other side. From signal flow and temperature measured at the limits of the wall, the thermophysical properties of the wall will be estimated by inverse method. We are at present interested in homogeneous walls. The inversion scheme is built around a digital model describing the response of the wall following the finite difference method in 1D. The identification of the thermal conductivity and heat volume of the wall is achieved by optimizing the group of parameters which minimizes the normalized difference between the temperature measured and the temperature standard simulated. The overall Global exchange coefficient is also identified from the same test. In this work, the method was applied to a homogeneous wall tile plaster introduction to the laboratory. It has a thickness of 6.5 cm. This technique was used for multilayer walls of buildings. The results of this inversion procedure were compared with reference values obtained from a standard procedure (DIN EN 12664-flow meter methods). A good agreement is obtained. Another part is the in situ tests
Orozco, Torrentera Julio Enrique. "Gestion de la qualité de service des flux multimédias dans un Internet à différenciation de services". Rennes 1, 2005. http://www.theses.fr/2005REN10036.
Texto completoBouguelia, Mohamed-Rafik. "Classification et apprentissage actif à partir d'un flux de données évolutif en présence d'étiquetage incertain". Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0034/document.
Texto completoThis thesis focuses on machine learning for data classification. To reduce the labelling cost, active learning allows to query the class label of only some important instances from a human labeller.We propose a new uncertainty measure that characterizes the importance of data and improves the performance of active learning compared to the existing uncertainty measures. This measure determines the smallest instance weight to associate with new data, so that the classifier changes its prediction concerning this data. We then consider a setting where the data arrives continuously from an infinite length stream. We propose an adaptive uncertainty threshold that is suitable for active learning in the streaming setting and achieves a compromise between the number of classification errors and the number of required labels. The existing stream-based active learning methods are initialized with some labelled instances that cover all possible classes. However, in many applications, the evolving nature of the stream implies that new classes can appear at any time. We propose an effective method of active detection of novel classes in a multi-class data stream. This method incrementally maintains a feature space area which is covered by the known classes, and detects those instances that are self-similar and external to that area as novel classes. Finally, it is often difficult to get a completely reliable labelling because the human labeller is subject to labelling errors that reduce the performance of the learned classifier. This problem was solved by introducing a measure that reflects the degree of disagreement between the manually given class and the predicted class, and a new informativeness measure that expresses the necessity for a mislabelled instance to be re-labeled by an alternative labeller
Pfiffer, Mathilde. "Amélioration de la tenue au flux laser des composants optiques du laser Mégajoules par traitement chimique". Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0689/document.
Texto completoIn this thesis, laser-induced damage resistance improvement of fused silica opticsis investigated in the nanosecond regime. This material is used on high power laser facilitiessuch as the Laser Mégajoule. In order to improve the optics life time and to ensure the nominaloperation of this facility, laser induced damage has to be controlled. This phenomenon is anirreversible modification of the components surface because of the interaction between the laserbeam and precursors defects. These defects are a consequence of the synthesis of silica and thepolishing of the optics and their presence can be reduced by a wet etching. This process consistsin an erosion of the surface using a chemical solution however optical properties must remainunchanged. In this thesis, we focus on the wet etching process and we conduct three studies. Thefirst one is about the characterization of the polishing induced contamination and the capabilityof a wet etching to remove it from the surface. The second and the third analyzes are about theimpact of the wet etching respectively on the surface and on the scratches. These studies allowus to evaluate the influence of the wet etching parameters as the chemical solution, the systemused and the deep etched. Finally, the highlights obtained thanks to these studies enable tooptimize the wet etching process and improve the laser induced damage resistance ofcomponents without compromising their optical properties
Lehto, Heather L. "Self-Potential Anomalies and CO2 Flux on Active Volcanoes: Insights from Time and Spatial Series at Masaya, Telica, and Cerro Negro, Nicaragua". [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002108.
Texto completoSilva, André Chicrala Amaral. "Evolution of active regions based on solar-surface magnetic flux observations and coronal magnetic fields extrapolations: a case-study of NOAA 12443". Instituto Nacional de Pesquisas Espaciais (INPE), 2017. http://urlib.net/sid.inpe.br/mtc-m21b/2017/07.07.18.24.
Texto completoA superfície solar é comumente populada por Regiões Ativas (ARs) que são conhecidas por seu intenso campo magnético quando comparadas com as regiões de Sol quieto. Durente sua evolução, as ARs podem dar origem a eventos energéticos como flares ou ejeções coronais de massa (CMEs).Nesse trabalho, dados coletados dos instrumentos Helioseismic and Magnetic Imager (HMI) e Hinode forão usados para medir o campo magnético na fotosfera, usando os perfis de Stokes, e para extrapolar essas medidas de vetor campo magnético para as camadas acima: a Chromosfera e a Coroa onde esses campos magnéticos não podem ser diretamente medidos com as técnicas e aparatos disponíveis para este estudo. Como o comportamento de um plasma é fortemente dependente do campo magnético esses resultados forão aplicados para estudar o comportamento da região ativa NOAA 12443. Os resultados incluem mapas dos parâmetros de Stokes da região NOAA 12443, os campos de velocidade ao longo da linha de visada, um estudo do comportamento de correntes e helicidade da região, um estudo da evolução energética da NOAA 12443 usando uma abordagem linear livre de forças e um cenário que estuda algumas das possíveis causas da atividade de flare e se o flare em questão foi um evento simpático.
Almeida, Camila do Carmo. "Sistema eletrônico baseado em diodos emissores de luz (LEDs) para aplicação em estudos de fisiologia vegetal". Universidade Federal de Juiz de Fora (UFJF), 2014. https://repositorio.ufjf.br/jspui/handle/ufjf/4167.
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Este trabalho teve por objetivos projetar um sistema eletrônico de controle destinado a fornecer uma alternativa simplificada e eficiente para estudos de fisiologia vegetal envolvendo luz artificial, bem como para sua utilização em determinados processos de cultivo de plantas em estufas. O trabalho apresenta uma revisão sobre a interação entre a iluminação artificial e o cultivo de plantas, tanto para o propósito de uma cultura comercial quanto para possibilitar a interpretação do comportamento de plantas em estudos botânicos. Este sistema eletrônico possibilita a determinação das quantidades radiométricas de interesse quando a iluminação artificial é usada como suplemento ou como única fonte de iluminação em cultivos. Com base em estudos anteriores, é proposto a produção de um sistema autônomo constituído por um aparelho de iluminação composto por LEDs brancos e/ou coloridos. Além disso, foram realizados alguns experimentos radiométricos preliminares utilizando luminárias comerciais de LEDs, visando sua utilização em associação com o sistema de controle proposto. Os parâmetros medidos mais relevantes foram o fluxo de fótons fotossinteticamente ativos, fluxo luminoso e a temperatura de cor correlata. Espera-se que o protótipo desenvolvido apresente características que agreguem flexibilidade e comportamento radiométrico relevante para cultivos controlados.
This work aims to develop an electronic control system with the purpose to drive a simplified and efficient alternative for vegetal physiology studies involving artificial light as well as for its utilization in certain plants crop at greenhouses. Additionally, this work presents a brief review regarding the interaction between artificial lighting and plants, with purposes of commercial crops and the possibility of interpretation of plants behavior in botanic studies. This electronic system enables the determination of the radiometric quantities of interest when the lighting is used as a supplement or as the only lighting source in crops. Using the latest studies, it is proposed an autonomous system consisting basically of white and/or colored LEDs. Besides, it were performed radiometric experiences using commercial luminaires with LEDs aiming the use of them in the proposed control system. The more relevant measured parameters were the photosynthetic photon flux, luminous flux and correlated colour temperature. The proposed system shows flexibility and relevant radiometric behavior, which are particularly useful in Plant Physiology.
Aalto, Rolf Erhart. "Geomorphic form and process of sediment flux within an active orogen : denudation of the Bolivian Andes and sediment conveyance across the Beni Foreland /". Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/6718.
Texto completoValverde, Quispe Janeth Veronica. "New insights on the nature of blazars from a decade of multi-wavelength observations : Discovery of a very large shift of the synchrotron peak frequency, long-term optical-gamma-ray flux correlations, and rising flux trend in the BL Lac 1ES 1215+303". Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX013.
Texto completoBlazars are known for their variability on a wide range of timescales at all wavelengths; and their classification (into flat spectrum radio quasars, low-, intermediate- or high-frequency-peaked BL Lac; FSRQ, LBL, IBL, HBL) is based on broadband spectral characteristics that do not consider the source being at, possibly, different states of activity. Recently, it was proposed that blazars could be classified according to the kinematics of their radio features. Most studies of TeV gamma-ray blazars focus on short timescales, especially during flares, due to the scarcity of observational campaigns or due to the relatively young existence of specialized, sensitive enough detectors.With a decade of observations from the Fermi-LAT and VERITAS, I present an extensive study of the long-term multi-wavelength variability of the blazar 1ES 1215+303 from gamma-rays to radio. This unprecedented data set reveals multiple strong gamma-ray flares and a long-term increase in the gamma-ray and optical flux baseline of the source over the ten-year period, which results in a linear correlation between these two energy bands over a decade. Typical HBL behaviors are identified in the radio morphology of the source. However, analyses of the broadband spectral energy distribution at different flux states of the source, unveil an extreme shift in energy of the synchrotron peak frequency from IR to soft X-rays; indicating that the source exhibits IBL characteristics during quiescent states and HBL behavior during high states. A two-component synchrotron self-Compton model is used to describe this dramatic change.A detailed framework of the analysis of the data from the Fermi-LAT instrument is provided, and could serve as a guideline for researchers interested in this field. I present the thorough efforts that were employed in validating the methods used and the sanity checks that were performed on the results obtained. A description of the higher-level analyses are provided, including the flare-selection algorithms, the search for harder-when-brighter behavior in the Fermi-LAT data, the multi-wavelength cross-correlation and variability analysis, the search for trends, log-normality and variability, the characterization of flares and of the spectral energy distributions, and the search for simultaneousFermi-LAT - VERITAS observations. These are the heart of this PhD work.The different methods applied and presented in this work provide a complete and detailed panorama of the intricate nature of this blazar, and possibly even challenge our current classification scheme. Moreover, this work provides an illustration of the type of long-term analyses that future imaging atmospheric instruments, such as the Cherenkov Telescope Array, will not only allow but potentially improve
Belati, Edmarcio Antonio. "Sensibilidade em fluxo de potência ótimo". Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-07102015-154129/.
Texto completoAn approach to solve the perturbated Optimal Power Flow (OPF) problem is proposed in this study. The methodology consists in obtaining the optimal solution for the initial problem via a program of OPF, and using sensitivity to estimate new solutions after the occurrence of some perturbations in the problem. These perturbations consist in load variations in some buses of the system. The sensitivity technique is based on both the information of second order and otimality conditions. The computation of the solutions after the occurrence of perturbations in the system does not depend of initial and correction parameters such as penalty and barrier used in the conventional OPF programs. The numerical results demonstrate the potential of this methodology for the solution of the perturbated OPF problem.
Cocaign-Bousquet, Muriel. "Croissance de Corynebacterium glutamicum sur divers substrats et répartition des flux dans les voies du métabolisme central". Toulouse, INSA, 1992. http://www.theses.fr/1992ISAT0032.
Texto completoEven, Sergine. "Régulation des voies centrales chez Lactococcus lactis : Intégration des profils métaboliques et transcriptionnels". Toulouse, INSA, 2001. http://www.theses.fr/2001ISAT0009.
Texto completoCentral metabolism of Lactococcus lactis was investigated in a global manner by integrating both biochemical and molecular approaches. A global and quantitative method of measurement of glycolytic transcripts was developed for this purpose. This approach was used to characterise the influence of sugar (glucose or galactose) and of the medium complexity on carbohydrate metabolism of L. Lactis IL 1403, which was recently sequenced by INRA. This strain showed novel physiological behaviour compared with the model strain L. Lactis NCDO 2118 : catabolic limitation occurred at the transport level and the metabolism remained homolactic, irrespective of the sugar. However, the transcript profile revealed a higher expression of mixed-acid metabolism genes on galactose. A correlation was established between transcriptional and enzymatic profiles by integrating growth dynamics. A translation efficiency was found to be higher on glucose than on galactose, irrespective of the medium richness. This approach was then extended to growth conditions closer to those used industrially, i. E. Carbon starvation and acid stress. Moreover, the effects of pH and growth rate, whose evolution is concomitant during a fermentation in which pH is not regulated, were dissociated during chemostat cultures, where only one parameter varied
Xue, Jing. "Single-phase vs. Three-phase High Power High Frequency Transformers". Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32919.
Texto completoMaster of Science
Martinez, Pujol Oriol. "Template tracking of articulated objects using active contours". Doctoral thesis, Universitat Pompeu Fabra, 2016. http://hdl.handle.net/10803/373919.
Texto completoIn this dissertation we fuse two of the traditional topics in Computer Vision: object segmentation and tracking. For segmentation we use the Active Contours (AC) framework and for tracking we use the Template Tracking (TT) scheme. Our aim is to combine them to create efficient and robust methods to segment and track articulated or deformable objects. In Chapter 1, we review the AC framework and we apply it over MilliMeter-Waves (MMW) images to segment bodies and concealed threats (such as explosives or guns) behind their wearing clothes. In Chapter 2 we review two of the main trends of TT methods: Lucas-Kanade optical flow and particle filters. Moreover, we combine them with an AC method to create a robust tracker for articulated or deformable objects without using prior shape information. Finally, in Chapter 3 we give the clues of how to efficiently introduce shape priors into the TT framework using AC methods.
Perrinet, Laurent. "Comment déchiffrer le code impulsionnel de la Vision? Étude du flux parallèle, asynchrone et épars dans le traitement visuel ultra-rapide". Phd thesis, Université Paul Sabatier - Toulouse III, 2003. http://tel.archives-ouvertes.fr/tel-00002693.
Texto completoPerrinet, Laurent. "Comment déchiffrer le code impulsionnel de la vision ? Etude du flux parallèle, asynchrone et épars dans le traitement visuel ultra-rapide". Toulouse 3, 2003. http://www.theses.fr/2003TOU30033.
Texto completoGasc, Laurent. "Conception d'un actionneur à aimants permanents à faibles ondulations de couple pour assistance de direction automobile : approches par la structure et par la commande". Phd thesis, Toulouse, INPT, 2004. http://oatao.univ-toulouse.fr/7375/1/gasc.pdf.
Texto completoAndersson, Tom. "Inverse Compton gamma-rays from Markarian 421 : A study of GeV and TeV emission from Mrk 421 based on Fermi-LAT and H.E.S.S. data". Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-57861.
Texto completoFeria, Gervasio David. "Analyse Systémique de la Modulation de la bascule respiro-fermentaire chez Saccharomyces cerevisiae". Toulouse, INSA, 2008. http://eprint.insa-toulouse.fr/archive/00000226/.
Texto completoThe aim of this work is to study the transition from respiratory to fermentative metabolism in Saccharomyces cerevisiae CENPK 113-7D and more specifically to evaluate the implication of the acetyl-coenzyme A derived carbon transport from cytosol to mitochondria in the onset of the metabolic shift. An original approach of microbiological engineering was carried out based on the utilization of chemostat with mixed substrates. The strategy consisted of introducing, during aerobic glucose-limited chemostat, a local perturbation around the step to be studied by the addition of a cosubstrate and in analyzing the consequences of such a perturbation on the metabolic transition. Oleic acid, L-carnitine and succinate were among the tested co-substrates. Feeding the culture with oleic acid led to a delay in the onset of the metabolic shift (up to 15 min), a redirection of the carbon flux toward biomass production (33% decrease in the ethanol production) and increases the critical dilution rate in accelerostat cultures (an 8% increase in the critical dilution rate). These results were found in a second strain of Saccharomyces cerevisiae tested. This work constitutes one of the rare successful reduction of the Crabtree effect reported in literature. A system biology approach, integrating macrokinetic, metabolic and trancriptomic analyses, was used of ways of understanding better the action of oleic acid in the onset of the metabolic shift
Raj, Gijo. "Interfacial interactions in Flax fibre / PLA biocomposite : from model surfaces to real fibres". Lorient, 2010. http://www.theses.fr/2010LORIS197.
Texto completoPoinas, Alexandra. "Étude de l'activation et de l'inhibition du flux d'électrons dans le flavocytochrome B de la NADPH-oxydase des neutrophiles bovins". Grenoble 1, 2001. http://www.theses.fr/2001GRE10042.
Texto completoBourhis, Pierre. "On the dynamics of active documents for distributed data management". Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00598299.
Texto completoLemos, Leticia Lindenberg. "Do controle de impacto à promoção do fluxo: um debate sobre polos geradores de tráfego em São Paulo". Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/16/16139/tde-01062017-162523/.
Texto completoIn Brazil and in São Paulo, the public policies concerning urban mobility have been historically oriented to promote the traffic flow for automobile. On the beginning of the XXI century, and particularly on its second decade, the debate about mobility started to a focus on people, rather than vehicles, and on the promotion of active modes. In this context, this research analysis the instrument used to control the impact on the circulation system, entitled Traffic Generating Poles. Based on new references for mobility policies we discuss the evolution of the regulatory framework for this instrument. We analyze how it has been implemented by the Traffic Engineering Company through a large sample of these buildings and a case study comparing two shopping centers in São Paulo. The results indicate that the instrument and its implementation present a low adherence to the conditions of the territory, leading to a limited approach on the elements of production and attraction of trips. With this research, we hope to contribute to the current debate on the production of cities that are more accessible both spatially and socially, and more environmentally friendly.
Falk, Olson Gustaf. "Power Electronic Stages for a TFPMSM in Wave Power Applications". Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194201.
Texto completoDirektdrivna vågenergiomvandlingssystem har utpekats som en potentiellt starkt bidragande resurs för att tillgodose världens efterfrågan på energi med andelar på uppemot 25 % av energimixen förutspådda. Anders Hagnestål bedriver forskning och utveckling av en ny typ av linjär permanentmagnetiserad transversalflödesmaskin vid Kungliga Tekniska Högskolan. Konceptmaskinen är särskilt väl lämpad för de rådande marina förhållandena genom att kunna producera stora krafter vid låga hastigheter med utomordentligt låga resistiva förluster. Maskinen går emellertid i kraftig magnetisk mättnad och drar asymmetriska strömmar vid nominell drift. Dessutom är effektfaktorn låg i jämförelse med standardmaskiner. Alltsomallt inför detta hårda krav på det effektelektroniska systemet och kontrollalgoritmerna. Målet med detta examensarbete har varit att designa ett funktionellt effektkonditioneringssystem som sammanfogar maskinen med det angränsande elektriska nätet. För att åstadkomma detta föreslås att en tvånivås-trefasomriktare kopplas rygg-mot-rygg till tvånivås-enfasomvandlare (aktiva likriktare) som i sin tur är kopplade till varje maskinfas. Med den här konfigurationen visas det att spänningen på den mellanliggande DC-länken kan hållas konstant med begränsat rippel, alltmedan effekt tillförs nätet vid effektfaktor ett genom att dimensionera DC-kondensatorn på rätt sätt och använda en kontrollag baserad på exakt linjärisering. Maskinens fasströmmar kan kontrolleras effektivt med hjälp av en kaskadkopplad PID-regulator med schemalagda förstärkningsfaktorer. Genom att inkludera ett lågpassfilter förväntas det att järnförlusterna i maskinen kan begränsas även vid lägre switchfrekvenser. Genom att lösa ett kostnadsoptimeringsproblem visas det att den resulterande aktiva likriktaren kan uppnå en verkningsgrad på 99.1 %. Slutligen, med det här examensarbetet som grund, föreslås det att den termiska stressen på de valda halvledarkomponentsmodulerna och järnförlusterna i maskinen utvärderas för att ytterligare förbättra designen. Om högre verkningsgrad eftersträvas hos de aktiva likriktarna kan mer komplicerade omvandlartopologier övervägas.
Paquet, Fabien. "Evolution morphostructurale des bassins de marge active en subduction : L'exemple du bassin avant-arc de Hawke Bay en nouvelle Zélande". Phd thesis, Université Rennes 1, 2007. http://tel.archives-ouvertes.fr/tel-00342682.
Texto completoBERTHELIER-BIHOREAU, CLAIRE. "Analyse des mecanismes de couplage dans l'antehypophyse : fonctions de la cascade arachidonique et des flux calciques". Paris 6, 1988. http://www.theses.fr/1988PA066078.
Texto completoKaci-Nait, Chabane Meriem. "Modulation de la perméabilité membranaire de deux inhibiteurs de la HMG CoA réductase par différents polyphénols végétaux issus de l'alimentation : caractérisation in vitro". Strasbourg, 2009. http://www.theses.fr/2009STRA2004.
Texto completoHenry, Laurent. "Les prosomes (proteasomes) au cours de la différenciation cellulaire : quantité, composition et cyto-localisation en fonction de l'inducteur utilisé". Montpellier 1, 1997. http://www.theses.fr/1997MON1T015.
Texto completoBoukongo, Sotaine Marie Aimé. "Etude des hydrates de gaz sur la marge active de Nankai (Japon) : analyse de données de sismique réflexion 3D et inversion des formes d'onde". Paris, Institut de physique du globe, 2007. http://www.theses.fr/2007GLOB0002.
Texto completoThe analysis of 3D seismic reflection data on the Nankai (Japan) active margin showed evidenceof a BSR (bottom simulating reflector) and a double BSR. The BSR is an acoustic impedance contrastat the interface separating sediments rich in gas hydrate, having a high velocity above, and sedimentsrich in free gas, having a low velocity below. The double BSR can be considered as a fossil BSR orcan result from a mixture of gases of different compositions within the sediments. The BSR depth isused to constrain the thermal regime in the 3D box (5 km x 42. 5 km) of the Nankai margin. The heatflow calculated from BSR depths gives values between 20-68 mW/m2. Strong BSR amplitudes arelocalized in the zone where the heat flow is relatively low, and weak BSR amplitudes are localized inthe zone where the heat flow is relatively high. The circulation of warm fluids would perturb theamplitude of BSR. The BSR is absent around the Tokai fault in the slope basin zone, and issometimes discontinuous or absent around the Kodaiba fault in the forearc basin zone. In the forearcbasin where the distribution of the BSR is more important, full waveform inversion results allowed toconfirm the presence of a zone with high velocity above the BSR, which could be due to the presenceof gas hydrate in sediments. Just below the BSR, we find a low velocity zone, which could be due tothe presence of the free gas in sediments. Strong BSR amplitude could be correlated with the presenceof underlaying free gas. The estimated concentration of gas hydrate is lower than 25 %. The meanvolume of gas hydrate calculated is about 85 x 107 m3. The estimated concentration of free gas variesbetween 0. 7 and 8 %. The mean volume of free gas calculated is about 6 x 107 m3. In the study area,we conclude that these concentrations/volumes are enormous but, they cannot constitute aneconomically exploitable reservoir, because gas hydrates are disseminated in the sediments
Masuda, Mario. "Aplicação do dispositivo FACTS (Flexible AC Transmission Systems) em sistema de distribuição -simulação de desempenho". Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-08122006-161400/.
Texto completoThe new FACTS technologies applied to the transmission system, based on power electronics, can also be useful to the distribution. For that, it is necessary to drive a procedure to consolidate the use and the performance for their application without risks. In this work two aspects will be approached. The first refers to the application of a FACTS device acting as series compensator. This device will be able to control the voltage in module and phase in order to act as a voltage drop in a serie reactance with capacitive or inductive features. The control of this series reactance (increasing/ decreasing) will allow the application of series compensation concept to any point of the distribution system, providing the benefits of continuous control of the voltage added to the load flow control in the system independent of the current. The second aspect refers to its use in the connection of two feeders controlling the active power between them. For this operation other device, UPFC, with similar concept as described previously, acts mainly in the phase of the injected voltage in the line, performing as a phase-shift with continuous taps variation and is able to control the active power flow between feeders. The application of this technology will provide several benefits for the distribution expansion, such as, a greater flexibility in the use of the network, connection of feeders without load flow interruption, continuous adjust of reactive power during the operation and dynamic control of power flow. The purpose of this work is to study the applicability of the FACTS technology, to extend this concept for the application in the distribution system by using digital simulations in distribution network up to 15kV identifying the performance and the reached benefits.
Consolini, Gabriela. "Otimização da síntese de intermediários de fármacos com reagentes naturais: Aplicação à reação da 2,4-tiazolidinadiona com vanilina e isovanilina". Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/9/9135/tde-04122018-123647/.
Texto completoThe process intensification is important in the search for less harmful and safe equipment and reactions, an example is the application of microreactors. The pharmaceutical industry is the largest beneficiary of this technology because microreactors, devices with microchannels up to 100 µm, can reduce the time required to develop and produce a new drug in years and can be mounted in extremely small and compact industrial units. The increase in diabetes cases in Brazil in the last decade has been encouraging the search for new drugs. In this work, the application of capillary microreactors is studied in the synthesis of (Z)-5-(4-hydroxy-3-methoxybenzylidene)2,4-thiazolidinedione (HMTZD) and (Z)-5-(3-hydroxy-4- methoxybenzylidene)2,4-thiazolidinedione (MHTZD), obtained from the reaction of 2,4-thiazolidinedione (TZD) with 4-hydroxy-3-methoxybenzaldehyde (Vanillin) and its isomer, 3-hydroxy-4-methoxybenzaldehyde (Isovanillin), which can be used in the synthesis of molecules with biological activity. Maximum yields of 98% in 480 min, for the product HMTZD, and 73% in 120 min, for the product MHTZD, were obtained, contradicting literature that shows a reaction time for this synthesis of 20 h to 40 h. In the flow synthesis in the microreactor, it was evident that the higher the temperature the higher the conversion of TZD and the yield of the product, reaching 100%, in ethanol working with the temperature of 160°C. The production in the batch process and the microreactor were calculated and, when compared, showed that only two 1 mL microreactors in their best operating condition are able to produce three times more than a 60 mL batch reactor. By the study of kinetics, the reaction using ethanol does not favor the formation of reactions in parallel or in series. The qualitative analyzes showed that the expected products was formed and with a high degree of purity.
Zefi, Floriana. "Gamma-ray flux variation studies from the blazar B2 1215+30 with the Fermi-LAT and the Crab Nebula with the H.E.S.S. experiment". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS587/document.
Texto completoThe current state-of-the-art experiments in gamma-ray astronomy are the Fermi-LAT in space and the ground-based H.E.S.S., VERITAS and MAGIC experiments. The monitoring of the very-high-energy gamma-ray emitting sources indicates the diverse physics taking place in astrophysical environments. To study the most energetic form of radiation and the most violent phenomena taking place in the Universe, individual source analyses are important. BL Lac objects, a subcategory of active galaxies, are the most abundant source class detected both in the GeV andTeV energies, while pulsar wind nebulae represent the most numerous identified source class in the galactic plane. Both source classes exhibit gamma-ray flux variations.In this thesis, the gamma-ray variability of the BL Lac object B2 1215+30 is presented with Fermi-LAT data. A bright flare, with 16 times the average quiescent flux, was detected in February 2014.In collaboration with the VERITAS experiment, the gamma-ray variability was investigated over five decades in energy. This work resulted in the detection of a luminous flare, seen simultaneously in GeV and TeV energies by both instruments. These results were used to set constraints on the size of the emission region and on the Doppler factor of the relativistic jet. Additionally, the long-term variability was studied using nine years of Fermi-LAT data. This brought out new flux enhancements, which characterize the long-term lightcurve from 100 MeV up to 500 GeV. Other striking characteristics are a steady linear increase of the yearly average flux, together with a hardening of the spectral index. The investigation of the light curve indicates a hint of quasi-periodic behavior with a period of around 1083±32 days.This work includes spectrum and flux variability studies for the well-studied but ever-surprising Crab Nebula at TeV energies with more than a decade of H.E.S.S. observations. The spectrum measured in this work goes from 280 GeV to 62 TeV, making this the first measurement tha textends to such very-high-energies. Considered as a standard candle for ground-based gamma-ray astronomy, the Crab Nebula is also used for calibration and instrument studies. The detection of GeV flares by the Fermi-LAT were unexpected and motivated the search of flux variations at TeVenergies with the H.E.S.S. experiment. The position of the Crab Nebula in the northern hemisphere makes this investigation challenging due to the large systematic uncertainties introduced by the non-optimal observation conditions. This work showed that the systematic uncertainties can be reduced by taking into account the atmospheric transparency. No flux variations were found at energies above 1 TeV from the H.E.S.S. I data. A flare reported by the Fermi-LAT in October 2016 was also investigated. This analysis showed the GeV flare lasting for one month, while the flux withH.E.S.S. II had an excess variance of 15 %. This should be compared to the commonly quoted 20% systematic uncertainty by H.E.S.S. experiment
Costa, Carlos Ednaldo Ueno. "O Método de Newton e a Função Penalidade Quadrática aplicados ao problema de fluxo de potência ótimo". Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-27112017-145520/.
Texto completoThis work presents an approach on Newton\'s Method associated with the quadratic penalty function and the active set methods in the solution of Optimal Power Flow Problem (OPF). The general formulation of the OPF problem is presented, as will as the technique used in the equation systems resolution. The Lagrangean matrix factorization is carried out by elements instead of structures in blocks. The characteristic of sparsity of the Lagrangean matrix is taken in to account. Numerical results of tests realized in systems of 3, 14, 30 and 118 buses are presented to show the efficiency of the method.
Conté, Jennifer. "Intensification of pharmaceutical production : from the raw materials to the crystallized active pharmaceutical ingredient". Thesis, Toulouse, INPT, 2016. http://www.theses.fr/2016INPT0015.
Texto completoOne of the many challenges in the pharmaceutical industry is to develop competitive processes to generate high quality active pharmaceutical ingredient (API) at low cost. To achieve this goal, many companies are looking towards flow chemistry and the advantages it affords, compared to traditional batch production. It is why this PhD work is focused on developing a continuous process from the raw materials to the API. The first step to achieve this goal was to collect data on the actual industrial batch process. It is composed of five steps, three steps of chemical reactions, one chromatographic separation and a crystallization step. From this starting point, the chemistry of each reaction was adapted to better use the advantages of flow chemistry. Thus, as the heat recovery in a continuous reactor is more efficient than in batch, it was possible to develop an exothermal reaction in neat conditions and at high temperature. A kinetic study was undertaken to gather knowledge on the reaction and develop a reaction model. This tool was used to find theoretical optimal operating conditions (temperature, residence time…) to guide the optimisation of the reaction and to design the future industrial reactor. The second part of this work is focused on the continuous crystallization of the API using the two impinging jets technology. It is required to have a tight control upon the morphology of the crystals and the particle size distribution (CSD). Indeed, the targeted API may crystallize under two competitive forms: cubic and needle crystals. The cubic form is the desired one. The two impinging jets technique was selected, since it is a continuous process able to generate small particles with a narrow CSD. The supersaturation is traditionally generated by impacting a jet of API solution with an anti-solvent one. Here, the solvent and the antisolvent are identical and only a large temperature difference between both streams is used to create the supersaturation. By screening different operating conditions, a “cubic zone” could be defined. Within this zone, only the desired crystal form is generated. Once the nucleation was under control, crystal growth and solid-liquid separation were studied to develop a complete crystallization process. By combining the research on the development of the chemical reactions and the crystallization step a full continuous process was proposed and was compared to the current batch one in order to evaluate the benefits brought by the flow chemistry to the API production
Xie, Hailian. "Voltage Source Converters with Energy Storage Capability". Licentiate thesis, Stockholm : Division of electrical machines and power electronics, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4191.
Texto completoKawolics, Karen. "Comparison of Daily Steps and Active Minutes using a Fitbit Device as part of an Online Community versus Tracking Alone". Cleveland State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=csu1512682140493223.
Texto completoHabarou, Florence. "Métabolisme de l'acétyl-CoA : modulation pharmacologique, approches thérapeutiques et nouvelles maladies". Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCB104.
Texto completoAcetyl-CoA is crucial for intermediary metabolism. It is at the crossroad of several metabolic pathways such as beta-oxidation, glycolysis, aminoacid catabolism, ketolysis, and fatty acid synthesis. It is also involved in other processes such as protein acetylation. In this document I studied different aspects of acetyl-CoA metabolism. First, I tried to correct fatty acid oxidation defects through pharmacological approach. Thanks to well- known methods and new ones, I showed that a combination of 30µM resveratrol and 35µM bezafibrate increased fatty acid oxidation capacities by increasing protein synthesis, as well as 400µM bezafibrate. Acetyl-CoA metabolism is also altered due to cofactors defects such as lipoic acid or riboflavine deficiency. I was involved in new diseases description and research for new biomarkers in this context. PDHc and GLUT1 deficiency are two different diseases with the same consequence : a defect in acetyl- CoA production from glucose. In order to improve patients’ quality of life, I evaluated the substitution of ketogenic diet with a racemic mix of L,D-3-hydroxybutyrate in PDHc and GLUT1 deficiency. The clinical evolution of patients was strikingly different, with an improvement in PDHc patients, whereas a degradation was noticed in GLUT1 patients. This difference might underline the role of anaplerosis in GLUT1 deficiency. Finally, I evaluated anaplerotic treatment and bezafibrate treatment in pyruvate carboxylase deficiency, an enzyme allosterically regulated by acetyl-CoA. To conclude, acetyl-CoA metabolism is altered in numerous inherited errors of metabolism, some of them being recently described. It can be modulated by pharmacological approaches. The development of new techniques such as metabolic flux analysis are useful for its study and for new treatments evaluation
Chovet, Camila. "Manipulation de la turbulence en utilisant le contrôle par mode glissant et le contrôle par apprentissage : de l'écoulement sur une marche descendante à une voiture réelle". Thesis, Valenciennes, 2018. http://www.theses.fr/2018VALE0016/document.
Texto completoThe present work aims to pre-evaluate flow control parameters to reduce the drag in a real vehicle. Two different actuation mechanisms (Murata’s micro-blower, and air-knives) are characterized and compared to define their advantages and limitations. Murata micro-blowers energized the boundary layer to directly perturb the vortex structures formed in the shear layer region. The air-knife has a rounded surface, adjacent to the slit exit, that could be considered as an active boat-tail (Coanda effect) for drag reduction. Different open-loop and closed-loop control strategies are examined, such as continuous blowing, periodic forcing, sliding mode control (SMC) and machine learning control (MLC). SMC is a robust closed-loop algorithm to track, reach and maintain a predefined set-point; this approach has on-line adaptivity in changing conditions. Machine learning control is a model-free control that learns an effective control law that is judged and optimized with respect to a problem-specific cost/objective function. A hybrid between MLC and SMC may provide adaptive control exploiting the best non-linear actuation mechanisms. Finally, all these parameters are brought together and tested in real experimental applications representative of the mean wake and shear-layer structures related to control of real cars. For the backward-facing step, the goal is to experimentally reduce the recirculation zone. The flow is manipulated by a row of micro-blowers and sensed by pressure sensors. Initial measurements were carried out varying the periodic forcing. MLC is used to improve performance optimizing a control law with respect to a cost function. MLC is shown to outperform periodic forcing. For the Ahmed body, the goal is to reduce the aerodynamic drag of the square-back Ahmed body. The flow is manipulated by an air-knife placed on the top trailing edge and sensed by a force balance. Continuous blowing and periodic forcing are used as open-loop strategies. SMC and MLC algorithms are applied and compared to the open-loop cases. The pre-evaluation of the flow control parameters yielded important information to reduce the drag of a car. The first real vehicle experiments were performed on a race track. The first actuator device concept and sensor mechanism are presented
Palma, Cruz Norman I. "Multiwavelength Analysis of the Gamma-Ray Blazar PKS 0528+134 in Quiescence". Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1289321486.
Texto completoDominguez, Bermudez Favio Enrique. "Simulation numérique de parcs d'hydroliennes à axe vertical carénées par une approche de type cylindre actif". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI020.
Texto completoThe capture, thanks to hydrokinetic turbines, of the kinetic energy generated by sea and river currents provides a significant and predictable source of renewable energy. The detailed simulation, using an unsteady statistical description of URANS type, of the flow around an isolated water turbine of HARVEST type (cross flow vertical axis ducted water turbine) provides an accurate estimate of the power output. However, the cost of the URANS approach is much too expensive to be applied to a farm of several turbines. A review of the literature leads to select a low-fidelity model of Blade Element Momentum (BEM) type to describe at a reduced cost the rotor effect on the flow, in a 2D context (horizontal cross-section). The turbine performance is then predicted using a steady RANS simulation including source terms distributed within a virtual rotor ring and preserving the mesh of the turbine fixed parts (duct). These source terms are derived using an original procedure which exploits both the local flow conditions upstream of the virtual rotor cells and the flow rate through the turbine. The hydrodynamic coefficients used to compute the BEM-RANS source terms are built once for all from a series of preliminary URANS simulations; they include the effects of the duct on the flow and the rotor operating at optimal rotational speed (maximizing the power output) thanks to the turbine regulation system. The BEM-RANS model is validated against reference URANS simulations: it provides a reliable prediction for the power output (within a few % of the URANS results) at a computational cost which is lowered by several orders of magnitude. This model is applied to the analysis of the power produced by a row of Vertical Axis Water Turbines in a channel for various values of the blockage ratio and lateral spacing as well as to a 3-machine sea farm