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Dissertations / Theses on the topic 'Observational signatures'

Author: Grafiati

Published: 18 May 2024

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1

Sming, Yue-Lin Sming. "Observational signatures of supersymmetric dark matter." Thesis, University of Sheffield, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.544174.

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Sarkar, Tamal. "Search for some observational signatures of general relativity." Thesis, University of North Bengal, 2017. http://hdl.handle.net/123456789/2643.

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Hamilton, Devon. "Observational signatures of convection in solar type stars." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ58914.pdf.

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4

Harding, Paul. "The formation of the Galactic bulge and halo: Observational signatures." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289743.

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The evolution of tidal debris within the Galactic halo has been simulated to determine its detectability within the constraints imposed by currently available telescopes and instrumentation. Observations of the simulations show that there is a very high probability of detecting and quantifying the presence of tidal debris with a pencil beam survey of 100 square degrees. The debris is readily detectable via the presence of kinematic substructure in the radial velocities. The detection probabilities show surprisingly little change with the age of the debris. Accretion events that occurred up to

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5

Bending, Victoria Louise. "Extra-solar planetary atmospheres and interior structure : implications for observational signatures." Thesis, Open University, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.701075.

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Hot Jupiter exoplanets are a previously unknown and fascinating field of study. Models of planet formation based only around the Solar System did not predict their existence, occupying as they do the orbital region less than 0.1 AD from their parent stars. Believed to be tidally locked, always presenting the same face to the star, these gas giants are bathed in intense irradiation, and inhabit a regime alien to anything known in the Solar System. As exoplanetary surveys discover an increasing number of planets, the ubiquity of hot Jupiters in the galaxy continues to be confirmed. Both the evol

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Patrick, Antolin Tobos. "Predicting observational signatures of coronal heating by Alfven waves and nanoflares." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/126571.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(理学)<br>甲第14894号<br>理博第3463号<br>新制||理||1507(附属図書館)<br>27332<br>UT51-2009-M808<br>京都大学大学院理学研究科物理学・宇宙物理学専攻<br>(主査)教授柴田一成, 教授一本潔, 教授嶺重慎<br>学位規則第4条第1項該当

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Jürgens, Gero [Verfasser], and Matthias [Akademischer Betreuer] Bartelmann. "Evolution and observational signatures of cosmic structures / Gero Jürgens ; Betreuer: Matthias Bartelmann." Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177148463/34.

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8

Ogawa, Takumi. "Observational Signatures of Super-Eddington Accretors:Views from Radiation Hydrodynamics/Radiation Transfer Simulations." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263470.

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9

Hall, Cassandra. "Using numerical simulations to identify observational signatures of self-gravitating protostellar discs." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/29585.

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In this thesis, I study numerical and semi-analytical models of self-gravitating protostellar discs, with the aim of furthering our understanding of the role of disc-self gravity in planet formation. At the time of writing, the ALMA era of observational astronomy is upon us. Therefore, I place my research into this context with synthetic images of both numerical and semi-analytical models. I begin with an examination into the apparent lack of convergence, with increasing resolution, of the fragmentation boundary in Smoothed Particle Hydrodynamics (SPH) simulations of a protostellar disc. I run

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10

Zach, Juergen Johann. "Observational Signatures of the Macroscopic Formation of Strange Matter during Core Collapse Supernovae." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1053470113.

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11

Winner, Georg Eckhard Verfasser], and Christoph [Akademischer Betreuer] [Pfrommer. "On the Evolution and Observational Signatures of Cosmic Ray Electrons in Magnetohydrodynamical Simulations / Georg Eckhard Winner ; Betreuer: Christoph Pfrommer." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://nbn-resolving.de/urn:nbn:de:bsz:16-heidok-289531.

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12

Winner, Georg Eckhard [Verfasser], and Christoph [Akademischer Betreuer] Pfrommer. "On the Evolution and Observational Signatures of Cosmic Ray Electrons in Magnetohydrodynamical Simulations / Georg Eckhard Winner ; Betreuer: Christoph Pfrommer." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/1220836303/34.

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13

Johnston, Katharine G. "Observational signatures of massive star formation : an investigation of the environments in which they form, and the applicability of the paradigm of low-mass star formation." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1895.

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This thesis presents both a study of the cluster-scale environments in which massive stars form, investigating in particular how the ionized gas in these regions relates to the molecular star-forming material, as well as detailed studies of two luminous forming stars, AFGL 2591 and IRAS 20126+4104, to determine whether they are forming similarly to their low-mass counterparts. The results of this work include the identification of 35 HII regions (20 newly discovered) via a radio continuum survey of ionized gas towards 31 molecular cluster-forming clumps. The observed ionized gas was found to b

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14

Etienne, Christian. "Réalisation et évaluation d'un sodar monostatique : étude des signatures sodars en fonction de paramètres météorologiques." Orléans, 1986. http://www.theses.fr/1986ORLE0404.

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Le but de ce travail a été la réalisation et l'évaluation d'un sodar simple monostatique à réflectivité. Les signatures très caractéristiques de la basse atmosphère fournies par ce sodar pendant trois mois, après avoir été classées sont comparées a celles obtenues aux USA, au Japon et au Canada. Puis une étude climatologique statistique comparant ces signatures sodars à différentes données météorologiques, permet d'établir des corrélations très étroites entre les différents échos sodars et les observations météorologiques principales telles que la température, l'humidité. . . Mais aussi entre

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Trottier, Eric. "Recherche de signatures spectrales d’objets astronomiques variant ultra rapidement dans les relevés spectroscopiques." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/29658/29658.pdf.

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16

Meng, Huan Y. A., George H. Rieke, Kate Y. L. Su, and András Gáspár. "The First 40 Million Years of Circumstellar Disk Evolution: The Signature of Terrestrial Planet Formation." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/623246.

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We characterize the first 40 Myr of evolution of circumstellar disks through a unified study of the infrared properties of members of young clusters and associations with ages from 2 Myr up to similar to 40 Myr: NGC 1333, NGC 1960, NGC 2232, NGC 2244, NGC 2362, NGC 2547, IC 348, IC 2395, IC 4665, Chamaeleon I, Orion OB1a and OB1b, Taurus, the beta Pictoris Moving Group,. Ophiuchi, and the associations of Argus, Carina, Columba, Scorpius-Centaurus, and Tucana-Horologium. Our work features: (1) a filtering technique to flag noisy backgrounds; (2) a method based on the probability distribution of

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17

Alkahtani, Abdulaziz M. A. l.-Musa. "Free hand simulation of Arabic signatures : Forensic examination and statistical observations." Thesis, Staffordshire University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522387.

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18

Matthews, Sarah H. "Thermal and nonthermal radiation signatures in solar flares : models and observations." Thesis, University of Glasgow, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309388.

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19

Gaspar, Andras. "Observations and Models of Infrared Debris Disk Signatures and their Evolution." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202982.

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In my thesis I investigate the occurrence of mid-infrared excess around stars and their evolution. Since the launch of the first infrared satellite, IRAS, we have known that a large fraction of stars exhibit significant levels of infrared emission above their predicted photospheric level. Resolved optical and infrared images have revealed the majority of these excesses to arise from circumstellar disk structures, made up of distributions of planetesimals, rocks, and dust. These structures are descriptively called debris disks. The first part of my thesis analyzes the Spitzer Space Telescope Ob

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20

Vontrat-Reberac, Aurélie Karine. "Etude des cornets polaires : observations in-situ à haute altitude et modélisation et observations des signatures ionosphériques." Versailles-St Quentin en Yvelines, 2003. http://www.theses.fr/2003VERS0023.

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Au niveau des pôles magnétiques, les lignes du champ magnétique de la Terre convergent et forment des entonnoirs appelés cornets polaires. Ces régions très localisées sont très sensibles aux conditions interplanétaires. Avec ses 4 satellites, la mission CLUSTER permet pour la première fois d'étudier la structure tridimensionnelle des régions frontières et de séparer les effets spatiaux des effets temporels. Nous avons exploité cette capacité pour analyser la dynamique spatio-temporelle de structures de particules observées dans le cornet polaire lors d'événements de reconnexion des champs magn

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21

Occhipinti, Giovanni. "Observations multi-paramètres et modélisation de la signature ionosphérique du grand séisme de Sumatra." Paris, Institut de physique du globe, 2006. http://www.theses.fr/2006GLOB0012.

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Ce travail de thèse fait l'objet d'une étude sur le couplage entre la Terre solide et ses enveloppes fluides, qu'il s'agisse de l'océan, de l'atmosphère neutre ou de sa partie ionisée. Les anomalies atmosphériques et ionosphériques de nature sismique seront traitées en détail avec une attention particulière aux effets produits par la propagation de l'onde de Rayleigh et de tsunamis. L'effet de la première sur le plasma ionosphérique a été mis en évidence depuis les années soixante grâce aux observations par sondeur Doppler et, récemment, par GPS via la mesure du contenu électronique total (TEC

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22

Boudin, Nathalie. "Recherche de signatures spectrales de cations aromatiques dans l'absorption diffuse interstellaire : confrontation spectroscopie de laboratoire, observations astronomiques." Paris 11, 2001. http://www.theses.fr/2001PA112348.

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Les Hydrocarbures Aromatiques Polycycliques (PAHs) sont maintenant reconnus comme un constituant important de la phase gazeuse du milieu interstellaire. Cette famille de molécules et en particulier leurs dérives ioniques semble être l'un des candidats les plus prometteurs pour l'identification des Bandes Diffuses Interstellaires (DIBs). Ces bandes d'absorption sont observées dans le visible sur des spectres d'étoiles masquées par des nuages. L'identification de PAHs comme molécules responsables de ces bandes ne peut se faire que par comparaison directe avec des spectres de PAHs obtenus dans de

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23

Bernard, Jérémy. "Signature géographique et météorologique des variations spatiales et temporelles de la température de l'air au sein d'une zone urbaine." Thesis, Ecole centrale de Nantes, 2017. http://www.theses.fr/2017ECDN0006.

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Ce travail de thèse propose une modélisation des différences de température d'air observées au sein d'une agglomération. Elle repose sur des formulations simples établies à partir de l'observation des interactions qui existent entre la formation d'un microclimat, son contexte géographique et les conditions météorologiques. Cinq réseaux de capteurs de température d'air sont utilisés,permettant de qualifier les microclimats de trois agglomérations du grand ouest français : Nantes, Angers et La Roche-sur-Yon. Un état de l'art des méthodes d'analyse du climat urbain est réalisé au chapitre 1. Le c

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24

Deligny, Olivier. "Observatoire Pierre Auger : analyse des gerbes inclinées, Observation de neutrinos d'ultra haute énergie, et signatures d'une origine locale pour les rayons cosmiques chargés." Paris 6, 2003. https://tel.archives-ouvertes.fr/tel-00002995.

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25

Wilson, Belinda R. "The Forgotten Signature: An Observational Study on Policy of Securing Identity in Prevention of Identity Theft and Credit/Debit Card Fraud at Retail Store POS Terminals." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3074.

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Identity theft and credit and bank card fraud is increasing in America and worldwide. Given the current statistics of its prevalence and practices around the world, many in government are starting to take critical notice due to its impact on a nation’s economy. Limited amounts of research have been conducted regarding the practices of applying the Routine Activities Theory (Cohen & Felson, 1979) to better equip store managers in understanding the critical need for capable and effective point of sale guardianship for in-store prevention of credit or bank card fraud due to identity theft. This r

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26

Deligny, Olivier. "Observatoire Pierre Auger : Analyse des gerbes inclinées, observation de neutrinos d'ultra haute énergie, et signature d'une origine locale pour les rayons cosmiques chargés." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2003. http://tel.archives-ouvertes.fr/tel-00002995.

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L'observatoire Pierre Auger se propose de recueillir une statistique sans précédent concernant le spectre des rayons cosmiques d'ultra haute énergie. Les quelques données actuelles suggèrent une absence de coupure GZK, coupure liée à la distance d'atténuation des protons dans un milieu de propagation tel que le rayonnement fossile à 3K.<br> Après avoir étudié l'effet des champs magnétiques extragalactiques sur la propagation des rayons cosmiques et l'influence sur le spectre, une grande partie du chapitre consacré à la description de l'expérience Auger sera laissée au système d'acquisition des

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27

Quentin, Céline. "Etude de la surface océanique, de la signature radar et de ses interactions avec les flux turbulents de quantité de mouvement dans le cadre de l'expérience FETCH." Paris 6, 2002. https://tel.archives-ouvertes.fr/tel-00010934.

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QUENTIN, Céline Gwenaëlle. "Etude de la surface océanique, de sa signature radar et de ses interactions avec les flux turbulents de quantité de mouvement dans le cadre de l'experience FETCH." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2002. http://tel.archives-ouvertes.fr/tel-00010934.

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L'objectif principal est l'étude de l'état de la mer et de ses relations avec les flux turbulents d'énergie et avec le signal radar rétrodiffusé. L'étude est basée sur les données de l'expérience FETCH (« Flux, Etat de la mer et Télédétection en Conditions de fetcH limité ») qui s'est déroulée dans le golfe du Lion, Méditerranée Occidentale, en Mars-Avril 1998. L'état de la mer a été étudié à partir de mesures in situ (bouées), et par télédétection aéroportée (radar RESSAC) et spatiale (altimètres TOPEX et ERS). Plusieurs états de mer (mer en développement, mer mixte et houle) associées à des

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29

Riccio, Giuseppe. "The Observational Signatures of Cosmic Strings." Tesi di dottorato, 2009. http://www.fedoa.unina.it/3790/1/riccio.pdf.

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Cosmic strings were postulated by Kibble in 1976 and, from a theoretical point of view, their existence finds support in modern superstring theories, both in compactification models and in theories with extended additional dimensions. One of the best observational evidences for cosmic strings is the gravitational lensing effects they produce. A first effect is produced by an intervening string along the line of sight which splits in two components (double images) faint background galaxies, thus forming a chain of lensed galaxies along the path of the string. The second optical method is the se

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30

Fernandez, Elizabeth Rose. "Observational signatures of the first stars : from the near infrared background to Lyman-[alpha] emitters." 2008. http://hdl.handle.net/2152/17868.

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31

Bogdanovic, Tamara. "Close encounters of black holes, stars, and gas in galactic nucle a study of the observational signatures /." 2006. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1537/index.html.

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32

Che-WeiChang and 張哲維. "Observation of Kondo Signatures in Spin-Orbit Coupled Quantum Wires." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/13338835550030194844.

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33

Law, Colin Christian. "Observations of magnetic signatures and structure in the dayside ionosphere of Venus." Thesis, 1993. http://hdl.handle.net/1911/13753.

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Present models of the Venus solar wind interaction do not allow for changes in the orientation of the field as you approach the planet. Analysis of high resolution magnetic field data from the Pioneer Venus Orbiter spacecraft has revealed two distinct field rotations that are observed to occur in conjunction with the dayside ionosphere and ionopause. These rotations are a result of the velocity shear at the ionopause and indicate an alignment of the magnetic field with the day to night ionospheric plasma flow. From these results a new configuration of the dayside field draping has been determi

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34

Corlies, Lauren Nicole. "Observationally Constrained Metal Signatures of Galaxy Evolution in the Stars and Gas of Cosmological Simulations." Thesis, 2016. https://doi.org/10.7916/D8FF3SJC.

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The halos of galaxies - consisting of gas, stars, and satellite galaxies - are formed and shaped by the most fundamental processes: hierarchical merging and the flow of gas into and out of galaxies. While these processes are hard to disentangle, metals are tied to the gas that fuels star formation and entrained in the wind that the deaths of these stars generate. As such, they can act as important indicators of the star formation, the chemical enrichment, and the outflow histories of galaxies. Thus, this thesis aims to take advantage of such metal signatures in the stars and gas to place obse

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35

Liu, Chih-Yuan, and 劉志原. "SEARCH FOR SIGNATURE OF WAVES ON THE SURFACE OF NEUTRON STARS - LONG-TERM X-RAY OBSERVATIONS OF PSR B1509-58." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/07743504838549394738.

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碩士<br>國立清華大學<br>天文研究所<br>91<br>The stable pulsar PSR B1509-58 has been monitored with the Rossi X-ray Timing Explorer (RXTE) for seven years, since the start of that mission in January 1996. The long-term observation has enabled us to determine the first and the se cond period derivatives which can help us to search for other possible periodicities with data over a long time span. These possible periods may reveal properties of MHD waves on the surface of neutron stars, and thus promote our understand ing of neutron star physics. As the first of such attempts,

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