Tesis sobre el tema "Observation des jets"
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Despringre, Vincent. "Observation et modélisation des jets extragalactiques observés en VLBI". Toulouse 3, 1996. http://www.theses.fr/1996TOU30212.
Texto completoGarcia, Paulo J. V. "Modélisation et observation de jets optiques issus d'objets stellaires jeunes". Lyon 1, 1999. http://www.theses.fr/1999LYO10328.
Texto completoHenderson, James T. "An observation of the electroweak production of a W-boson with two associated jets in a vector-boson fusion topology". Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:8093f8d9-05ab-4448-9c1d-5b31949c9a3b.
Texto completoPiron, Anne. "Observation de la convection profonde en mer d'Irminger sur la période 2002-2015 par les flotteurs Argo". Thesis, Brest, 2015. http://www.theses.fr/2015BRES0059/document.
Texto completoThe deep convection events are important because they form the intermediate and deep water masses feeding the global circulation. The Labrador Sea is the main site of deep convection in the North Atlantic Ocean and produces the intermediate Labrador Sea Water (LSW). The lrminger Sea was also cited but was forgotten during decades because of the lack of direct observations. This thesis provides the first description of the lrminger Sea deep convection at basin scale, thanks to the Argo data. Three convective events occurred in the lrminger Sea since 2010. During the 2011-2012 winter, the convection reached 1000 m and is explained by the sequence of the Greenland tip jets. The event of the 2O13-2O14 winter, reaching 130O m, is characterized by a strong preconditioning and a weak forcings by the Greenland tip jets.The convection event of the 2O14-2015 winter, reaching 1700 m, shows many of persistant tip jets. The advection of LSW from the Labrador Sea explains the deepest mixed layers observed during the last two winters. The results show that deep convection in the lrminger Sea is not a rare isolated event and plays a significant role on the climate balance
CETORELLI, FLAVIA. "First observation of the electroweak production of a W+W- pair in association with two jets in the fully leptonic channel with the CMS detector at the LHC". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/369032.
Texto completoThis thesis reports the first observation of the electroweak production of a W+W- pair of bosons in association with two jets in the fully leptonic final state. The analysis has been performed using the data sample collected by the CMS detector during the 2016-2018 p-p collisions at center-of-mass energy of 13 TeV, provided by the Large Hadron Collider (LHC). The electroweak W+W- production belongs to the very rare class of vector boson scattering (VBS) processes, which are purely electroweak at tree level. The investigation of VBS processes is a central objective of the LHC since they are connected directly to the Higgs boson and the spontaneous symmetry breaking mechanism of the electroweak interaction. The events were selected requiring the presence of two leptons (eμ) with opposite sign charges, two jets with large invariant mass and large pseudorapidity separation, and a certain amount of missing transverse momentum. Events are then separated into different categories considering the flavor of the charged leptons: ee, μμ, and eμ. The ttbar-tW productions constitute the main background of the analysis. Another important source of background is due to diagrams containing two QCD vertices, which produce the same final state as the signal (QCD-induced W+W- production). The Drell-Yan (DY) production contaminates the ee and μμ final states, while this background is highly suppressed in the eμ one. A deep neural network (DNN) was trained to separate the signal from the ttbar and the QCD-induced W+W- production in the eμ final state. The use of the DNN output as a discriminator in this category has boosted the performance of the analysis. Finally, the analysis reaches the observation of the electroweak W+W- signal with a statistical significance of 5.6 standard deviations, whereas 5.2 standard deviations were expected. Moreover, two cross sections are measured into two different fiducial phase spaces. The first one is an inclusive phase space, defined with cuts at parton level on the two outgoing partons: they are required to have a pT > 10 GeV and an invariant mass mqq > 100 GeV. The measured cross section in the inclusive phase space is 99 ± 20 fb to be compared with the theoretical expectation at the lowest order of 89 ± 5 fb. The second one is an exclusive volume, defined with requirements on observables at generator level that mimic the ones of the analysis signal region. In this fiducial volume, the cross section observed is 10.2 ± 2.0 fb, while the expected one is 9.1 ± 0.6 fb. These are the first measurements of the purely electroweak W+W- cross section; the results show good agreement with standard model expectations. The thesis also reports the work for the electromagnetic calorimeter (ECAL) calibration. The EFlow method, developed during this work, provides per-crystal intercalibration with a time granularity of about 1-2 days to correct the time drift in light response that is still visible after laser corrections. The method relies on the use of minimum bias events from soft collisions, as the φ-symmetry method, which are expected to have a uniform distribution in φ. The EFlow extends the idea of the φ-symmetry method, normalizing the energy of each crystal to the mean of the barrel. In this way, the response in time of each crystal is adjusted to the average drift of the barrel. The events with electrons from W and Z decays are used to correct the residual global drift. The corrections derived in this way are competitive with ones obtained by the method employed during Run II, which used the E/p distribution of electrons from W and Z decays. Thanks to the fine space-time granularity of these corrections and the rapidity of deriving them, the method may be implemented in Run III to provide the so-called “prompt” calibrations for the ECAL.
Yao, Yijun. "Exploration d’un équipement d'observation non intrusif pour la compréhension des processus de projection thermique". Electronic Thesis or Diss., Bourgogne Franche-Comté, 2023. http://www.theses.fr/2023UBFCA025.
Texto completoThe fourth industrial revolution ushered in a new technological era characterized by digitalization and intelligence. In this context, there is a growing tendency to combine traditional technologies with more modern information technologies. This approach is opening up a new avenue of interpretation for scientific research.In the context of this study, which is specific to thermal spraying, the work involved using a non-invasive display device to collect on-line images of a jet seeded with powder particles. Processing these images using a specially developed algorithm resulted in the extraction of relevant and reliable data on the construction processes of a spray coating.Indeed, thermal spraying, as a traditional technology in the field of surface treatments, is also a very promising technique in the field of additive manufacturing. The coatings produced by this method have excellent properties and are widely applied in a variety of sectors. It therefore seems important to change the paradigm by incorporating computer technologies.The experiments carried out enabled us to observe the phenomena/processes involved in the plasma spraying of alumina particles, and an algorithm was developed to extract the interesting data contained in the images observed (size distribution of the flying particles, growth pattern of the coating on the substrate, deposition efficiency, etc.). In this way, it was possible to study the particle velocity and flight angle distributions throughout the plasma spraying process.Subsequently, validation of the observation technique and the algorithm applied to plasma spraying made it possible to study the existing cold spraying process. In situ observation of copper particles was therefore carried out to identify the stacking process of cold-sprayed layers and to quantify the size and dispersion of the particles forming the deposit. The study also combined different characterization methods to understand the process of layer stacking during cold spraying
Stoeffler, Clara. "Spectroscopie à très haute résolution de molécules sublimées en jet supersonique : vers une observation de la non conservation de la parité dans les molécules chirales par spectroscopie laser". Phd thesis, Université Paris-Nord - Paris XIII, 2011. http://tel.archives-ouvertes.fr/tel-00647517.
Texto completoMcCraw, Jennifer Leigh. "Observations on Upstream Flame Propagation in Ignited Hydrocarbon Jets". NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-03312006-002715/.
Texto completoJohansson, Petra. "Low-level jets – observationer från Näsudden på Gotland". Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-303861.
Texto completoWhen air is flowing from one type of surface to another, an internal boundary layer is built up where the properties of the air gradually change. This is the basic condition for the development of for example advected low-level jets caused by inertial oscillations, whose origin is that under certain conditions an imbalance will occur between the forces driving the wind. The purpose with the present work was to map the influence from low-level jets on the wind profile at Näsudden, Gotland, above 100 m height. For this purpose, measurements taken on three towers in the area during the period May 2000 to July 2001 were used. One tower was located inland 1.5 km from the coastline of Näsudden, a second tower was located just at the coastline, and a third one was located offshore 4.6 km from the coast. Since the offshore tower was located in the middle of the Bockstigen wind farm, surrounded by five wind turbines, the wind measurements were affected by turbine wakes in certain wind direction sectors. By comparing the wind measurements taken on the tower with measurements taken on the turbines for directions where the tower was not in the wake, corrections were determined where by the wind measurements taken on the turbines could be used for sectors where the tower was located in wakes. To investigate the influence from low-level jets on the wind profile, data from Bockstigen were used together with a wind model based on the equations of motion, Monin-Obukhov’s similarity theory, and K-theory. The model, which is unable to generate low-level jets, was used to calculate the wind profiles over the sea and how these profiles were modified after passage of the coastline. The results from the model were compared to observations made on the 145 m high tower at Näsudden, 1.5 km from the coast. The comparison showed that the observed wind speed at 145 m height on the average was ca 0.8 m/s higher than the wind speed calculated with the model for wind directions from the sea at Näsudden, which could be assumed to be the effect of the presence of low-level jets. During the months March to May the water in the Baltic Sea is climatologically colder than the air temperature, which is favorable for the development of low-level jets. The results from these months showed that the measured wind speed at 145 m height in the wind direction sector 220°-250° was as much as 1.7 m/s higher than what was calculated with the model, which points at the importance of low-level jets during this part of the year. During the rest of the year the average difference between observed and modeled wind speed at the 145 m level was about 0.8 m/s for the same wind direction.
Papantoniou, Dimitris Antony List E. John. "Observations in turbulent buoyant jets by use of laser-induced fluorescence /". Diss., Pasadena, Calif. : California Institute of Technology, 1986. http://resolver.caltech.edu/CaltechETD:etd-03142008-142149.
Texto completoBarre, Cyril. "Jet en écoulement transversal : observations expérimentales et numériques". Nancy 1, 1998. http://www.theses.fr/1998NAN10277.
Texto completoMacDonald, Nicholas Roy. "Bridging the gap : synthetic radio observations of numerical simulations of extragalactic jets /". Halifax, N.S. : Saint Mary's University, 2008.
Buscar texto completoMalzac, Julien. "A la lumière des trous noirs - Disques d'accrétion, couronnes et jets dans l'environnement des trous noirs accrétants". Habilitation à diriger des recherches, Université Paul Sabatier - Toulouse III, 2008. http://tel.archives-ouvertes.fr/tel-00332415.
Texto completoTabone, Benoît. "L'origine des jets protostellaires à l'ère d'ALMA : de la modélisation aux observations". Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEO024/document.
Texto completoThe question of angular momentum extraction from protoplanetary disks (hereafter PPDs) is fundamental in understanding the accretion process in young stars and the formation conditions of planets. Pioneering semi-analytical work, followed by a growing body of magnetohydrodynamic (MHD) simulations, have shown that when a significant vertical magnetic field is present, MHD disk winds (hereafter MHD-DWs) can develop and ex- tract some or all of the angular momentum flux required for accretion. The aim of this PhD thesis is to exploit the unprecedented capabilities provided by ALMA to clarify the accretion-ejection process in protostars. This goal is achieved following three approaches: 1) comparison of MHD-DW models with the kinematics of HH 212 jet observed by ALMA at high angular resolution. I report the discovery of a rotating SO/SO2 wind consistent with a MHD-DWs launched out to ∼40 au with SiO tracing dust-free streamlines launched from 0.05−0.3 au. 2) Analytical and numerical study of the interaction between a pulsat- ing inner jet embedded in a stationary disk wind. Observational signatures are identified from the morphology and the kinematics of bow-shock shells. 3) Chemical signatures of a jet launched inside the dust sublimation radius (∼ 0.2 au). I show that despite the strong X-FUV field and the absence of dust, molecules like SiO or CO can form efficiently from a small fraction of H2. This scenario will be confronted to JWST observations
Tazaki, Fumie. "Study of Radio-Loud Active Galactic Nuclei with X-Ray Observations". 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188491.
Texto completoScullion, Eamon. "Investigating jets in the lower-to-mid solar atmosphere : observations & numerical simulations". Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556987.
Texto completoCarrillo, Bibriezca Laura Elena. "Observations of cold pool jets in the continental shelf of the Celtic Sea". Thesis, Bangor University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395866.
Texto completoGutschow, C. "First observation of Z boson plus two jet production". Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1456690/.
Texto completoMATSURA, EDSON EIJI. "Observation et modelisation du jet produit par un canon d'arrosage". Paris, ENGREF, 1993. http://www.theses.fr/1993ENGR0021.
Texto completoYung, Hong-kiu Bosco y 容康喬. "VLBA observations and kinematic modelling of the high velocity molecular jets from the water fountain IRAS 18286-0959". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B45847848.
Texto completoCratere, Angela. "Prospects for future observations of off-axis short gamma-ray burst jets associated with binary neutron star mergers". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Buscar texto completoKalfountzou, Eleni. "The evolution of AGN and their host galaxies". Thesis, University of Hertfordshire, 2015. http://hdl.handle.net/2299/17004.
Texto completoBuchner, Jens Stefan [Verfasser] y Kurt [Akademischer Betreuer] Roth. "Constructive Inversion of Vadose Zone GPR Observations / Jens Stefan Buchner. Betreuer: Kurt Roth". Heidelberg : Universitätsbibliothek Heidelberg, 2012. http://d-nb.info/1061054411/34.
Texto completoErler, Jens [Verfasser]. "Spectro-spatial observations of galaxy clusters with Planck and CCAT-prime / Jens Erler". Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1218475005/34.
Texto completoMolina, Lumbreras Edgar. "Modeling and observations of relativistic outflows in high-energy binary systems". Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/672686.
Texto completoA la nostra Galàxia, existeixen sistemes binaris formats per un objecte compacte i una estrella companya típicament no degenerada que emeten a freqüències des de ràdio fins a raigs gamma. Les interaccions entre l'estrella i l'objecte compacte poden resultar en el llançament d'outflows de plasma originats al voltant de l'objecte compacte, els quals poden adquirir velocitats properes a la de la llum. Quan l'estrella companya és molt massiva, aquesta genera un fort vent estel·lar que interacciona amb els outflows i els afecta tant dinàmicament com radiativa. El principal objectiu d'aquesta tesi des del punt de vista teòric és l'estudi de les interaccions entre els outflows de sistemes binaris i el vent estel·lar d'una companya massiva. Per això, hem desenvolupat una sèrie de models semi- analítics que donen una visió completa d'aquestes interaccions en diferents tipus d'escenaris. Els resultats de la modelització teòrica inclouen prediccions per a les distribucions espectrals d'energia i corbes de llum, així com mapes ràdio per a l'emissió a gran escala dels outflows. En relació a la part observacional, aquesta tesi es focalitza en l'anàlisi de l'emissió potencial de raigs gamma de molt alta energia de la binària MAXI J1820+070, observada amb els telescopis MAGIC. Els resultats observacionals consisteixen en un estudi multifreqüència de la font de ràdia a raigs gamma. Tot i que la font no es detecta per sobre dels 100 MeV, els resultats obtinguts permeten limitar les propietats d'un emissor potencial de raigs gamma a MAXI J1820+070. En conclusió, aquesta tesi profunditza en el coneixement de les interaccions entre el vent estel·lar i els outflows de sistemes binaris d'altes energies. També es conclou que les observacions en raigs gamma de sistemes binaris permeten limitar de manera important les propietats dels outflows, fins i tot quan les fonts no son detectades.
Rienstra, Melanie A. "Parental and community responsibility to educate children observations and guidelines from Deuteronomy, Proverbs, Colossians, and Ephesians /". Theological Research Exchange Network (TREN), 2005. http://www.tren.com.
Texto completoKubota, Kaori. "Optical Spectroscopic and X-ray Observations of the Galactic Jet Source SS 433". 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/120661.
Texto completoGatu, Johnson Maria. "Fusion Plasma Observations at JET with the TOFOR Neutron Spectrometer : Instrumental Challenges and Physics Results". Doctoral thesis, Uppsala universitet, Tillämpad kärnfysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-114077.
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
Zhang, Meng. "Satellite observations and numerical simulations of jet-front gravity waves over North America and North Atlantic Ocean". Texas A&M University, 2008. http://hdl.handle.net/1969.1/85995.
Texto completoHamidi, Dalila. "Spectroscopie de saturation à plusieurs zones d'interaction sur un jet supersonic d'iode : Observation de franges de ramsey 514,5 nm". Paris 13, 1992. http://www.theses.fr/1992PA132027.
Texto completoFouquet, Marc. "Earth imaging with microsatellites : an investigation, design, implementation and in-orbit demonstration of electronic imaging systems for Earth observation on-board low-cost microsatellites". Thesis, University of Surrey, 1995. http://epubs.surrey.ac.uk/844455/.
Texto completoShangguan, Ming [Verfasser], Jens [Akademischer Betreuer] Wickert, Jürgen [Akademischer Betreuer] Oberst, Roman [Akademischer Betreuer] Galas, Robert [Akademischer Betreuer] Weber y Harald [Akademischer Betreuer] Schuh. "Analysis and derivation of the spatial and temporal distribution of water vapor from GNSS observations / Ming Shangguan. Gutachter: Jürgen Oberst ; Roman Galas ; Jens Wickert ; Robert Weber ; Harald Schuh. Betreuer: Jens Wickert". Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1066162239/34.
Texto completoPlatis, Andreas [Verfasser] y Jens [Akademischer Betreuer] Bange. "Airborne observations of turbulence and its influence on new particle formation in the atmospheric boundary layer / Andreas Platis ; Betreuer: Jens Bange". Tübingen : Universitätsbibliothek Tübingen, 2017. http://d-nb.info/116550684X/34.
Texto completoPradel, Nicolas. "Etude des objets compacts symétriques en VLBI : imagerie et astrométrie par référence de phase". Toulouse 3, 2005. http://www.theses.fr/2005TOU30242.
Texto completoThis study is about compact symetric objects (CSO). These objects are a specific type of active galactic nuclei only observed at a very accurate angular resolution (milliarsecond). This resolution is only obtained with the very long baseline interferometry (VLBI). CSO present a specific geometry with symetric jets on this scale. A presentation of the forty known CSO is included in this study. A preliminary study of an astrometric VLBI technique (phase-referencing) used in this study showed that this technique is accurate at a 50 microarcseconds level. In the first part of the study, classical VLBI observations of the CSO OQ208 showed apparent motions of the components with an accuracy of 10 µas/yr. In the second part of the study, phase referencing observation of 8 CSO produced maps with an 1 mas angular resolution and the accuracy of the phase-referencing astrometry of all components of the 8 CSO was about 20 to 30 µas
Yassine, Manal. "The prompt emission of Gamma-Ray Bursts : analysis and interpretation of Fermi observations". Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTS006/document.
Texto completoGamma-Ray Bursts (GRBs) are very energetic and brief flashes of high-energy radiations which are emitted in a short time scale (fraction of a second to several minutes). The GRB bright emission is thought to be powered by a newly formed stellar-mass black hole that is accompanied by a collimated outflow (i.e. a jet) moving at a relativistic speed. The emission is observed as two successive phases: the highly variable “prompt” phase and the late and less luminous “afterglow” phase. The two instruments on board the Fermi space telescope, the Gamma-ray Burst Monitor (GBM) and the Large Area Telescope (LAT), allow the study of GRB prompt emission over a broad energy range (from ~10 keV to ~100 GeV). In June 2015, a new set of LAT data (Pass 8) was publicly released, which were generated using improved algorithms of reconstruction and classification of gamma-ray events. The main goal of my thesis is the analysis and interpretation of the spectral and temporal properties of the prompt emission phase of the GRBs observed by Fermi, especially using LAT Pass8 data.In the first part of my work, I performed a detailed time-resolved spectral analysis of the prompt phase of GRB 090926A with GBM and LAT data. My results confirm with a greater significance the spectral break at ∼400 MeV that is observed during a fast variability pulse, and they also reveal the presence of a spectral attenuation throughout the GRB prompt emission, as well as an increase of the break energy up to the GeV domain. I interpreted the spectral break in terms of gamma-ray absorption or as a natural curvature of the inverse Compton (IC) emission in the Klein-Nishina regime. Strong constraints on the jet Lorentz factor were obtained in both scenarios. My results lead also to emission radii R ∼10^14 cm, which are consistent with an internal origin of both the keV-MeV and GeV prompt emissions above the jet photosphere.The second part of my work is an exploration of the internal shock model that has been developed by collaborators at the "Institut d'Astrophysique de Paris" (IAP). This model simulates the GRB jet dynamics and the radiations (synchrotron and IC processes) from a population of shock-accelerated electrons. I simulated the response of the Fermi instruments to the synthetic GRB spectra provided by this numerical code. From these simulations, I built a new parametric function that can be used to fit the keV-MeV spectra of GRBs with the model. I applied successfully this function to a sample of 64 GBM bright GRBs. I confronted also the IAP model to the prompt emission spectrum of GRB 090926A. I obtained a relatively good agreement and I identified a couple of solutions that may improve it. The synthetic spectra are wider than any GRB spectra in the GBM sample. I present some theoretical developments that could improve the data-model agreement in the future, and I discuss possible advances from future GRB missions as well
Madougou, Saïdou. "Étude du potentiel éolien du jet nocturne dans la zone sahélienne à partir des observations de radars profileurs de vent". Phd thesis, Université Paul Sabatier - Toulouse III, 2010. http://tel.archives-ouvertes.fr/tel-00530163.
Texto completoMadougou, Saïdou. "Etude du potentiel éolien du jet nocturne dans la zone sahélienne à partir des observations de radars profileurs de vent". Toulouse 3, 2010. http://thesesups.ups-tlse.fr/959/.
Texto completoThis work presents a large study of the wind characteristics and the diurnal and seasonal wind variations obtained from the data of two wind profiler radars installed at Bamako in 2005 and at Niamey in 2006. The nocturnal low level jet peaked at 14 m s-1 at 500 m. It was still obvious at 150 m. Important wind shears were also shown, together with the impacts on aircraft activity. The wind pattern was marked by a strong diurnal cycle as well as a strong seasonal cycle. A wind assessment was made by two methods. The first involved the wind distributions directly observed. The second was based on the Weibull distributions. Day and night were compared. Results showed that the nocturnal low level jet was an interesting source of energy provided that wind turbines were 150 m high and huge-capacity energy storage was used, so that the energy stored at night could be restored during the daytime, when the demand is highest. Harmattan period is most propitious with an output power exceeding 300 W m-2 due to the nocturnal jet. The economic study results showed that this energy was found to be cheap relative to other renewable energy sources
SAUVAGE, LAURENT. "Observations des cirrus des moyennes latitudes par lidar : importance du courant jet polaire pour la formation et les echanges verticaux". Paris 6, 2000. http://www.theses.fr/2000PA066539.
Texto completoGlawion, Dorit [Verfasser], Karl [Gutachter] Mannheim, Matthias [Gutachter] Kadler y Jan [Gutachter] Conrad. "Contemporaneous Multi-Wavelength Observations of the Gamma-Ray Emitting Active Galaxy IC 310 - New Clues on Particle Acceleration in Extragalactic Jets / Dorit Glawion. Gutachter: Karl Mannheim ; Matthias Kadler ; Jan Conrad". Würzburg : Universität Würzburg, 2015. http://d-nb.info/1111886997/34.
Texto completoAbergel, Alain. "Traitement et analyse des images transmises lors des survols de la comete de halley par les sondes vega". Paris 6, 1987. http://www.theses.fr/1987PA066226.
Texto completoHartmann, Jens [Verfasser] y Christian [Akademischer Betreuer] Meyer. "Outcomes in patients with dual antegrade conduction in the atrioventricular node : insights from a multicentre observational study / Jens Hartmann ; Betreuer: Christian Meyer". Hamburg : Staats- und Universitätsbibliothek Hamburg, 2020. http://d-nb.info/1216629420/34.
Texto completoFlüeli, Marc. "Observation des structures anormales de petites particules d'or et d'argent par microscopie électronique à haute résolution et diffraction d'électrons par un jet d'agrégats d'argent /". [S.l.] : [s.n.], 1989. http://library.epfl.ch/theses/?nr=796.
Texto completoGIANNINI, Leonardo. "Deep Learning techniques for the observation of the Higgs boson decay to bottom quarks with the CMS experiment". Doctoral thesis, Scuola Normale Superiore, 2020. http://hdl.handle.net/11384/91153.
Texto completoDrabek-Maunder, Emily Rae. "A submillimetre study of nearby star formation using molecular line data". Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/14587.
Texto completoLi, Changqiao. "b-tagging calibration and observation of Higgs boson decays to a pair of bottom quarks with the atlas detector". Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS620.
Texto completoThis thesis firstly describes a measurement of the b-jet tagging efficiency with a tag-and-probe method using data recorded by the ATLAS detector in 2015 and 2016. The efficiency measurement method, the object selection, the event and probe jet selection, the evaluation of the statistical and systematic uncertainties, and the final results are discussed. The b-tagging efficiencies have been measured as a function of the jet transverse momentum, pseudorapidity and of the average number of pile-up collisions. The efficiencies measured in data have been compared to those predicted from simulation, and simulation-to-data efficiency scale factors have been determined. The efficiency scale factors are close to unity, with total uncertainty ranging between 2% and 12%. The second part of this thesis focuses on the search for the decays of the Standard Model (SM) Higgs boson to bottom quarks in the associated production mode with vector bosons. Two measurements have been performed and are described here: the first one is based on of 13 TeV pp collisions recorded by ATLAS during the LHC Run-2 until 2016; the second one includes the additional of 13 TeV pp collisions recorded in 2017. For the study based on of data, the object reconstruction, event selection and classification, the techniques to discriminate the signal from the background, the main background and their modelling, the signal properties and the interpretation of results are discussed. For the study based on data, the main difference from the previous study are highlighted. Both results provide a strong evidence of the process, with statistical significances of 3.5 and 4.9 standard deviations, respectively. The signal strength, defined as the ratio between the measured cross section times branching ratio and the SM prediction, is measured with the 2015–2017 dataset to be , indicating good agreement with the SM. The combination of the results based on of 13 TeV collisions with the results of the same analysis performed on data collected at lower (7 and 8 TeV) centre-of-mass energies in 2011 and 2012, and witht those of the searches of decays in other Higgs boson production modes (vector-boson fusion, associated production with a top-quark pair) have led to the observation of the decay with a significance of 5.4 standard deviations, and to a measurement of the signal strength . A combination of the results of the results based on of 13 TeV collisions with the results of searches for the same production mode on the same amount of data in the diphoton and ZZ∗ → 4l Higgs boson final states has led to the observation of VH production with a significance of 5.3 standard deviations, and to a measurement of the signal strength , in good agreement with the SM
Jiménez, Cortés Maria Antònia. "Stably stratified atmospheric boundary layer: study trough large-eddy simulations, mesoscale modelling and observations". Doctoral thesis, Universitat de les Illes Balears, 2005. http://hdl.handle.net/10803/9433.
Texto completoAquest treball es centra en l'estudi de la CLE mitjançant 3 eines diferents: 1) simulacions explícites de grans remolins (més conegudes com a simulacions LES), per determinar el comportament dels moviments turbulents, on les resolucions són de l'ordre de metres; 2) simulacions mesoscalars, per caracteritzar els efectes locals, on les resolucions són de l'ordre de kilòmetres; 3) anàlisi de les observacions sota aquestes condicions per tal de caracteritzar i entendre millor els fenòmens observats.
En primer lloc s'estudia el rang d'estabilitats a on el model LES, que considera la teoria de Kolmogorov per la dissipació de l'energia, funciona correctament. Els resultats del model són realistes tal com mostra la seva comparació amb les mesures de dues campanyes experimentals (SABLES-98 i CASES-99). Per explorar més a fons els resultats LES i per comparar-los amb les mesures s'han utilitzat les Funcions de Distribució de Probabilitat (PDF). Aquests resultats LES són també comparables als obtinguts amb altres models LES, tal com mostra la intercomparació de models LES, més coneguda com a GABLS.
Un cop desenvolupades totes les eines necessàries es fa un LES d'un cas més realista, basat en les observacions d'un màxim de vent de capes baixes (més conegut com a Low-Level Jet, LLJ). L'anàlisi combinat dels resultats LES i les mesures permet entendre millor els processos de barreja que tenen lloc a través de la inversió. Finalment, la contribució dels efectes locals s'estudia mitjançant les simulacions mesoscalars, en aquest cas centrades a l'illa de Mallorca. Durant el vespre es veu com les circulacions locals es desenvolupen a les conques (de longitud al voltant de 25km), formant-se, per exemple, vents catabàtics o LLJ com l'estudiat anteriorment. En aquest cas les simulacions es verifiquen amb imatges de satèl·lit NOAA i observacions de les estacions automàtiques de mesures, donant resultats semblants.
The atmospheric boundary layer is the area directly influenced by the presence of the Earth's surface and its height is from hundreds of meters to few kilometres. During the night, the radiative cooling stratifies the layer close to the surface and it forms the Stably-stratified Atmospheric Boundary Layer (SBL). Nowadays, the SBL is a regime not well enough characterized, yet. Turbulence, which is not homogeneous either isotropic, and the great importance of the local effects, like the orography, among other factors, make the SBL be a difficult regime to study. Even so, the SBL is an object of special attention, especially when improving its representation in numerical prediction models or climate models.
This work focuses on the study of the SBL through 3 different tools: 1) Large-Eddy Simulations (LES), to determine the turbulent motions, where the resolutions are about 1m; 2) Mesoscale simulations, to characterize the local effects, where resolutions are about 1km; 3) Analysis of the observations under these conditions in order to better characterize and understand the observed phenomena.
In first place, it is studied the range of stabilities where the LES model, that considers the Kolmogorov theory for the dissipation of the energy, works correctly. The results are realistic as the comparison with measures from two experimental campaigns (SABLES-98 and CASES-99) shows. To explore the results more thoroughly, and to compare the LES results to the measurements, the Probability Density Functions (PDF) have been used. The LES results are also comparable to the ones obtained with other LES models, as the intercomparison of different LES models show, better known as GABLS.
Then, a more realistic case is performed using the LES model, based on observations of a Low-Level Jet (LLJ). The combined inspection of the LES results and the observations allow to better understand the mixing processes that take place through the inversion layer. Finally, the contribution of the local effects is studied through a mesoscale simulation. Here the attention is focused on the Mallorca Island. During the night, the model is able to reproduce the local circulations is a basin of a characteristic size of 25km. The main features obtained previously from the LES of the LLJ are also reproduced by the mesoscale model. These runs are verified with NOAA satellite images and observations from the automatic surface weather stations, giving that the model is able to reproduce realistic results.
Pinault, Jonas. "Study of swash motion in an embayed beach based on observations and phase-resolving wave modeling - Case of the Grande Plage of Biarritz". Electronic Thesis or Diss., Pau, 2022. http://www.theses.fr/2022PAUU3015.
Texto completoDue to the ever growing anthropogenic pressure at the coast and the perspectives of sea levelrise, coastal hazards such as overtoping are more threatening than ever. In this context, accurateestimations of the wave contributions to the total water level (TWL) at the shoreline, namelythe run-up, are crucial for coastal engineers and those involved in coastal zone managementand engineering design. In this work, we propose to investigate wave run-up in an urban-ized embayed beach based on observations and phase-resolving numerical modeling. First, thephase-resolving model based on the Boussinesq equations BOSZ is validated against laboratoryLiDAR measurements to provide an extensive validation and sensitivity analysis. Then, themodel is applied to the real configuration of the Grande Plage of Biarritz, a complex urbanizedembayed beach. A data-set from a 3-day field campaign carried out in 2018 including pressuremeasurements and video-derived run-up data is utilized for the model validation. These ap-plications demonstrate that the model reproduces wave transformations and subsequent swashmotions reasonably well. The validated model results and observations are then used to investi-gate the swash motions, under varying conditions of waves and tide. Results show that the tidallevel played a key-role in the swash dynamics. At low tide, the conditions were dissipative andthe swash was dominated by the infragravity motions. At high tide reflective conditions wereobserved with a domination of the short-wave frequencies. These changes are explained by thedouble-slope profile where a low sloping area is found in the intertidal zone and a steep slope onthe foreshore. The tidal modulation also influenced the dissipation of infragravity waves, whichwere found to dissipate energy substantially at low tide through breaking, while at mid andhigh tide standing wave patterns, characteristic of shoreline reflection, were observed. Underenergetic conditions the influence of the tide was minimized as the large waves tended to breakon the low sloping portion, regardless of the tide. These results highlight the complexity of theswash behavior in 3D conf
Buß, Jens Björn [Verfasser], Wolfgang [Akademischer Betreuer] Rhode y Bernhard [Gutachter] Spaan. "Bad moon rising? : Studies on the performance of the First G-APD Cherenkov Telescope under bright light conditions using SiPMs for gamma-ray observations / Jens Björn Buß ; Gutachter: Bernhard Spaan ; Betreuer: Wolfgang Rhode". Dortmund : Universitätsbibliothek Dortmund, 2020. http://d-nb.info/122821431X/34.
Texto completoRodriguez, Zuluaga Juan Verfasser], Claudia [Akademischer Betreuer] Stolle, Jorge Luis [Akademischer Betreuer] Chau, Astrid [Gutachter] Maute, Robert [Gutachter] Pfaff, Jens [Gutachter] Tronicke, Philipp [Gutachter] Richter, Carsten [Gutachter] [Denker, Frank [Gutachter] Krüger y Gert [Gutachter] Zöller. "Electric and magnetic characteristics of equatorial plasma depletions : an observational assessment using the Swarm mission / Juan Rodriguez Zuluaga ; Gutachter: Astrid Maute, Robert Pfaff, Jens Tronicke, Philipp Richter, Carsten Denker, Frank Krüger, Gert Zöller ; Claudia Stolle, Jorge Luis Chau". Potsdam : Universität Potsdam, 2020. http://d-nb.info/1219515426/34.
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