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Dissertations / Theses on the topic 'Orbit Models'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 September 2023

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1

McClendon, David Matthew. "Orbit discontinuities and topological models for Borel semiflows." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3416.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.<br>Thesis research directed by: Mathematics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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2

Zhou, Ning. "Onboard orbit determination using GPS measurements for low Earth orbit satellites." Thesis, Queensland University of Technology, 2005. https://eprints.qut.edu.au/16076/1/Ning_Zhou_Thesis.pdf.

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Recent advances in spaceborne GPS technology have shown significant advantages in many aspects over conventional technologies. For instance, spaceborne GPS can realize autonomous orbit determination with significant savings in spacecraft life cycle, in power, and in mass. At present, the onboard orbit determination in real time or near-real time can typically achieve 3D orbital accuracy of metres to tens metres with Kalman filtering process, but 21st century space engineering requires onboard orbit accuracy of better than 5 metres, and even sub-metre for some space applications. The research f

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3

Zhou, Ning. "Onboard Orbit Determination Using GPS Measurements for Low Earth Orbit Satellites." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16076/.

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Recent advances in spaceborne GPS technology have shown significant advantages in many aspects over conventional technologies. For instance, spaceborne GPS can realize autonomous orbit determination with significant savings in spacecraft life cycle, in power, and in mass. At present, the onboard orbit determination in real time or near-real time can typically achieve 3D orbital accuracy of metres to tens metres with Kalman filtering process, but 21st century space engineering requires onboard orbit accuracy of better than 5 metres, and even sub-metre for some space applications. The research f

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4

Liu, Jia, and 刘佳. "Exact solutions for electron pairing models with spin-orbit interactions and Zeeman coupling." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/196010.

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Although a number of methods with appropriate approximations, such as mean-field theory, local density approximation, and tight-binding method have been well developed and widely used in solid state physics, they possess strong limitations, and thus physicists never stop trying to find methods that could rigorously solve the models of condensed matter systems. This thesis presents several new exact solutions for electron pairing models with spin-orbit interactions and Zeeman coupling, which have not been studied before. First, a type of electron pairing model with spin-orbit interactions or Z

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5

Younger, Coleman Thomas. "THERMAL MODELS FOR A 3 CM MINIATURE XENON ION THRUSTER." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/413.

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In order to support UCLA’s development of the 3 cm Miniature Xenon Ion (MiXI) thruster, Cal Poly has a 3 cm thruster under development. This version, called MiXI Cal Poly Version 1 (MiXI-CPv1), is complete and has been utilized in vacuum chamber thermal validation testing. Testing on this version was used to check the validity of heat transfer simulations modeled in SolidWorks. Investigations of the 3 cm ion thruster configuration were intended to discover the driving factors affecting the thermal behavior of the discharge chamber and surrounding design space. Numerical simulations indicate th

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6

Baù, Giulio. "Techniques for simulation and control of innovative aerospace systems: numerical models for attitude and orbital dynamics." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422105.

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The PhD thesis deals mainly with special and general perturbation techniques. The main results are the development of a new regularized method for propagating the motion of a particle around an attractive central body and the derivation of accurate analytical formulas to predict the motion in the particular case of constant tangential thrust<br>La tesi di dottorato tratta principalmente tecniche speciali e generali di perturbazione. I risultati più significativi sono lo sviluppo di un nuovo metodo regolarizzato per la propagazione del moto di una particella intorno ad un corpo centrale di attr

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7

Miura, Nicholas Z. "COMPARISON AND DESIGN OF SIMPLIFIED GENERAL PERTURBATION MODELS (SGP4) AND CODE FOR NASA JOHNSON SPACE CENTER, ORBITAL DEBRIS PROGRAM OFFICE." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/86.

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This graduate project compares legacy simplified general perturbation model (SGP4) code developed by NASA Johnson Space Center, Orbital Debris Program Office, to a recent public release of SGP4 code by David Vallado. The legacy code is a subroutine in a larger program named PREDICT, which is used to predict the location of orbital debris in GEO. Direct comparison of the codes showed that the new code yields better results for GEO objects, which are more accurate by orders of magnitude (error in meters rather than kilometers). The public release of SGP4 also provides effective results for LE

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8

Mrigakshi, Alankrita Isha [Verfasser]. "Galactic Cosmic Ray Exposure of Humans in Space : inﬂuence of galactic cosmic ray models and shielding on dose calculations for low-Earth orbit and near-Earth interplanetary space / Alankrita Isha Mrigakshi". Kiel : Universitätsbibliothek Kiel, 2014. http://d-nb.info/105038864X/34.

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9

Mancino, Antonio. "On the structural and dynamical properties of a new class of galaxy models with a central BH." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18722/.

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This thesis work focuses on the dynamical properties of two-component galaxy models characterized by a stellar density distribution described by a Jaffe profile, and a galaxy (stars plus dark matter) density distribution following a r^(-3) shape at large radii. The dark matter (hereafter, DM) density profile is defined by the difference between the galaxy and the stellar profiles. The orbital structure of the stellar component is described by the Osipkov-Merritt (OM) radial anisotropy, and that of the DM halo is assumed isotropic; a black hole (BH) is also added at the center of the galaxy. T

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10

Michaud, Yonnel. "Etude phénoménologique de la réaction d'échange de charge (pi)-p -> (pi)[n à haute énergie]." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10097.

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La presente these est consacree a l'etude de la reaction d'echange de charge pion negatif proton donne pion nul neutron. Cette reaction fait partie des processus quasi-elastiques, caracterises par de petits moments transferes, et donc non interpretables par la chromodynamique quantique. Le modele de glauber, utilise avec succes dans le cadre de la diffusion elastique, est exploite ici pour l'etude de la reaction d'echange de charge. Une interaction effective entre quarks, incluant un terme central et un terme spinorbite, est employee afin de rendre compte de l'echange du meson rho. Les resulta

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11

Venzmer, Malte [Verfasser], Volker [Akademischer Betreuer] Bothmer, Volker [Gutachter] Bothmer, et al. "The solar wind’s geomagnetic impact and its Sun--Earth evolution -- Predictive models for space weather and the Parker Solar Probe orbit / Malte Venzmer ; Gutachter: Volker Bothmer, Ansgar Reiners, Stefan Dreizler, Wolfram Kollatschny, Hardi Peter, Andreas Tilgner ; Betreuer: Volker Bothmer." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://d-nb.info/1170955851/34.

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12

Banerjee, Anindo. "A Model to Predict Sun Gear Radial Orbit of a Planetary Gear Set having Manufacturing Errors." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1344872497.

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13

Chamberlain, Matthew Allyn. "Response of Martian Ground Ice to Orbit-Induced Climate Change." Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195434.

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A thermal model is developed to find the distribution of stable near-surface ground ice on Mars that is in diffusive contact with the atmosphere for past and present epochs. Variations in the orbit of Mars are able to drive climate changes that affect both surface temperatures and atmospheric water content so the distribution of ground ice will vary significantly in past epochs. A technique is developed to correct the average water vapor density above the surface for depletion due to diurnal frost formation. Also presented is a simple model to estimate the atmospheric water content, based on

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14

Fonte, Daniel John. "Implementing a 50x50 gravity field model in an orbit determination system." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/49587.

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15

Bush, Matthew Peter. "Spin-dependent interactions in the three-body eikonal model." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/844619/.

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A derivation of the elastic scattering differential cross section, within a three-body eikonal model, that treats both central and spin-orbit interactions between the constituent projectile clusters and the target is presented. This formalism is then used in the theoretical study of the scattering of 8B from 12C at 40 MeV/nucleon. The proton halo candidate, 8B, is taken to consist of a single valence proton orbiting a 7Be core cluster. Calculation of the elastic scattering amplitude relies upon determining the phase shifts caused as the projectile passes through the region of interaction with

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16

Dostál, Michal. "Closures of (U+K)-orbits of essentially normal models." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0002/NQ34757.pdf.

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17

Конин, Валерий Konin Valeriy, Алексей Pogurelskiy Oleksey Погурельский, and Федор Shyshkov Fedir Шишков. "Model for navigation satellite availability on various orbits analysis." Thesis, Proceedings, THE SIXTH World Con-gress. Aviation in the XXI- st Century. Safety in Aviation and Space Technologies, September 23–25, 2014 .– Kyiv, 2014. – V.2, – P.3.2.22 – 3.2.25, 2014. http://er.nau.edu.ua/handle/NAU/25239.

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While facing different tasks in space, the necessity to create a reliable way of navigation in space is required. The model is developed to analyze the availability of the navigation satellites in space<br>National Aviation University

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18

Turner, L. W. "Some simple pseudo-systems that model Jahn-Teller systems with spin-orbit coupling." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380009.

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19

Mohan, Swati. "Quantative [sic] selection and design of model generation architectures for on-orbit autonomous assembly." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/59664.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 243-251).<br>On-orbit assembly is an enabling technology for many space applications. However, current methods of human assisted assembly are high in cost and risk to the crew. Thus, there is a desire to automate the on-orbit assembly process using robotic technology. Automation introduces additional challenges in the design of the assembly, particularly within the control systems. During an assembly sequence, a

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20

Chadwell, C. David. "Investigation of stochastic models to improve the global positioning system satellite orbits /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487861796818699.

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21

Zhang, Chi. "Spin-orbit torque damping control and auto-oscillations of dipole field-localized spin wave modes." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1515079497750423.

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22

Pospíšil, Miroslav. "Model lineárního transpondéru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218590.

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This master’s thesis deals with satellite transponders. Firstly, satellite communication basics, satellite services definitions, frequency bands and satellite orbits are investigated. The second chapter forms the satellite transponders analysis. The transparent transponder and the transponder with on-board processing are described. Finally, a transponder model is designed and simulated in communication chain.

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23

Berglund, Mari. "Spin-Orbit Maps and Electron Spin Dynamics for the Luminosity Upgrade Project at HERA." Doctoral thesis, KTH, Alfvén Laboratory, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3191.

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24

Zenteno, Torres Jazmin. "Sliding mode control with fault tolerance capacities : application to a rendezvous mission in a circular orbit." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0063.

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De nombreux travaux de recherche ont ´et´e conduits dans le domaine de synthèse de lois de commande par modes glissants. Différentes approches de commande été proposées dans la litérature, telles que l’algorithme Super-Twisting (STA) et sa version récente, l’algorithme généralisé Super-Twisting (GSTA). Les travaux de recherche présentés dans ce mémoire de thèse s’inscriventdans ces méthodes pour résoudre le problème de commande et de commande tolérante aux fautes, pour une mission spatiale. La mission considère une cible passive et un chasseur. L’objectif visé est de synthétiser les lois de co

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25

Nainer, Carlo. "In-Orbit Data Driven Parameter Estimation for Attitude Control of Satellites." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0058.

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Cette thèse porte sur la détermination des paramètres du modèle dynamique d’un satellite pour son contrôle à l’aide de la théorie de l’identification des systèmes. Plusieurs algorithmes d’estimation paramétrique sont développés et adaptés à différentes configurations de mesures de données (gyroscope ou star tracker). Ces algorithmes permettent d’estimer la matrice d’inertie du satellite ainsi que l’alignement des actionneurs à partir des données de télémétrie. Pour réaliser cette estimation, la méthode de variable instrumentale est privilégiée. Des filtres sont élaborés afin d’améliorer signif

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Pinto, Juliana Vieira [UNESP]. "Comparação de modelos para o cálculo de pertubações orbitais devidas à maré terrestre." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/89856.

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Made available in DSpace on 2014-06-11T19:24:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-07Bitstream added on 2014-06-13T18:51:55Z : No. of bitstreams: 1 pinto_jv_me_guara.pdf: 1385196 bytes, checksum: 8f4e005504bfa301a50295aa1563c0d7 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Universidade Estadual Paulista (UNESP)<br>Aplicações recentes de satélites artificiais da Terra com finalidades geodinâmicas requerem órbitas determinadas com bastante precisão. Em particular, marés terrestres influenciam o potencial terrestre causando perturbações ad

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Pinto, Juliana Vieira. "Comparação de modelos para o cálculo de pertubações orbitais devidas à maré terrestre /." Guaratinguetá : [s.n.], 2005. http://hdl.handle.net/11449/89856.

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Orientador: Rodolpho Vilhena de Moraes<br>Banca: Maria Cecília França de Paula Santos Zanardi<br>Banca: Hélio Koiti Kuga<br>Resumo: Aplicações recentes de satélites artificiais da Terra com finalidades geodinâmicas requerem órbitas determinadas com bastante precisão. Em particular, marés terrestres influenciam o potencial terrestre causando perturbações adicionais no movimento de satélites artificiais, as quais têm sido medidas por diversos processos. A atração exercida pela Lua e pelo Sol sobre a Terra produz deslocamentos elásticos em seu interior e uma protuberância em sua superfície. O res

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28

Baboux, Florent. "Effets spin-orbite géants sur les modes collectifs de spin de puits quantiques." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-01020564.

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Cette thèse est consacrée à l'étude des effets du couplage spin-orbite dans des puits quantiques semi-conducteurs dopés (GaAs et CdMnTe), par spectroscopie Raman électronique. Dans ces structures existent des champs magnétiques intrinsèques (Dresselhaus et Rashba). Ces champs offrent des moyens attractifs pour manipuler le spin des électrons, mais contribuent aussi à la relaxation de spin via leur dépendance avec le vecteur d'onde de l'électron (mécanisme D'yakonov-Perel'). Nous montrons que pour les modes collectifs de spin de puits quantiques, le scénario destructif D'yakonov-Perel' est tran

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29

Wenzel, Wolfgang. "Mean-field theories of the Hubbard model and periodic orbits in chaotic maps /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487683756125101.

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30

Leary, Cody Collin 1981. "Measurement and control of transverse photonic degrees of freedom via parity sorting and spin-orbit interaction." Thesis, University of Oregon, 2010. http://hdl.handle.net/1794/10910.

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xv, 215 p. : ill. (some col.) A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.<br>In this dissertation, several new methods for the measurement and control of transverse photonic degrees of freedom are developed. We demonstrate a mode sorter for two-dimensional (2-D) parity of transverse spatial states of light based on an out-of-plane Sagnac interferometer. The first experimental 2-D parity sorting measurements of Hermite-Gauss transverse spatial modes are presented. Due to the inherent phase stability of this ty

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31

Lefier, Yannick. "Etudes du couplage spin-orbite en nano-photonique. applications à l'excitation unidirectionnelle de modes plasmoniques guidés et à la génération d'opto-aimants nanométriques contrôlables par l'état de polarisation de la lumière." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2065/document.

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Cette thèse porte sur la manipulation du moment angulaire de la lumière à l'échelle sub-micronique. Le moment angulaire total de la lumière est composé d'une partie de spin, relié au degré de liberté de polarisation circulaire de la lumière, et d'une partie orbitale, relié au degré de libertés spatiaux de la lumière que sont sa direction de propagation (locale et globale) et sa distribution spatiale d'intensité. Le couplage spin-orbite existant entre ces deux contributions permet alors de manipuler les degrés de libertés spatiaux de la lumière par un simple contrôle de son état de polarisation

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32

Basaran, Hasan. "Comparison of Control Approaches for Formation Flying of Two Identical Satellites in Low Earth Orbit." Thesis, KTH, Rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290182.

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Formation flying of satellites describes a mission in which a set of satellites arrange their position with respect to one another. In this paper, satellite formation flying guidance and control algorithms are investigated in terms of required velocity increment Delta-v, and tracking error for a Chief/Deputy satellite system. Different control methods covering continuous and impulsive laws are implemented and tested for Low Earth Orbit (LEO). Sliding Mode, Feedback Linearization and Model Predictive Controllers are compared to an Impulsive Feedback Law which tracks the mean orbital element dif

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33

Dettmering, Denise. "Die Nutzung des GPS zur dreidimensionalen Ionosphärenmodellierung." Stuttgart : IAGB, 2003. http://deposit.d-nb.de/cgi-bin/dokserv?idn=96846095X.

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34

Paerschke, Ekaterina. "Interplay of Strong Correlation, Spin-Orbit Coupling and Electron-Phonon Interactions in Quasi-2D Iridium Oxides." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-235245.

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In the last decade, a large number of studies have been devoted to the peculiarities of correlated physics found in the quasi-two-dimensional square lattice iridium oxides. It was shown that this 5d family of transition metal oxides has strong structural and electronic similarities to the famous 3d family of copper oxides. Moreover, a delicate interplay of on-site spin-orbit coupling, Coulomb repulsion and crystalline electric field interactions is expected to drive various exotic quantum states. Many theoretical proposals were made in the last decade including the prediction of possible super

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35

Malloy, Michael G. "Spacecraft Trajectory Optimization Suite (STOpS): Design and Optimization of Multiple Gravity-Assist Low-Thrust (MGALT) Trajectories Using Modern Optimization Techniques." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2247.

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The information presented in the thesis is a continuation of the Spacecraft Trajectory Optimization Suite (STOpS). This suite was originally designed and developed by Timothy Fitzgerald and further developed by Shane Sheehan, both graduate students at California Polytechnic State University, San Luis Obispo. Spacecraft utilizing low-thrust transfers are becoming more and more common due to their efficiency on interplanetary trajectories, and as such, finding the most optimal trajectory between two planets is something of interest. The version of STOpS presented in this thesis uses Multiple Gra

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El, Mir Ghina. "Algèbres de Clifford conformes et orbites de points de vue d'images." Thesis, La Rochelle, 2014. http://www.theses.fr/2014LAROS013/document.

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L'objectif de ce travail est de décrire des modélisations des points de vue et des changements de points de vue d'images d'un objet planaire dans les algèbres de Clifford conformes. Nous généralisons le modèle conforme de l'espace euclidien à travers une famille à deux paramètres d'horosphère, chacune d'entre elles étant plongée dans un espace vectoriel réel de dimension 4 muni d'une métrique équivalente à la métrique de Minkowski. Nous décrivons par la suite deux approches pour mettre en œuvre ces modèles conformes généralisés pour les représentations d'images. L'idée de base est d'encoder le

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Yokoyama, Takehito, Seiichiro Onari, and Yukio Tanaka. "Enhanced triplet superconductivity in noncentrosymmetric systems." American Physical Society, 2007. http://hdl.handle.net/2237/11291.

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Riemann, Bernard [Verfasser], Thomas [Akademischer Betreuer] Weis, and Andreas [Gutachter] Jankowiak. "The bilinear-exponential closed-orbit model and its application to storage ring beam diagnostics / Bernard Riemann. Betreuer: Thomas Weis. Gutachter: Andreas Jankowiak." Dortmund : Universitätsbibliothek Dortmund, 2016. http://d-nb.info/1112561854/34.

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39

Garzon, Alejandro. "Model-based control of cardiac alternans on one dimensional tissue." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37140.

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When excitable cardiac tissue is electrically paced at a sufficiently high rate, the duration of excitation can alternate from beat to beat despite a constant stimulation period. This rhythm, known as alternans, has been identified as an early stage in a sequence of increasingly complex instabilities leading to the lethal arrhythmia ventricular fibrillation (VF). This connection served as as a motivation for research into the control of alternans as a strategy to prevent VF. Control methods that do not use a model of the dynamics have been used for the suppression of alternans. However, these

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Malherbe, Victor. "Multi-scale modeling of radiation effects for emerging space electronics : from transistors to chips in orbit." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0753/document.

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En raison de leur impact sur la fiabilité des systèmes, les effets du rayonnement cosmique sur l’électronique ont été étudiés dès le début de l’exploration spatiale. Néanmoins, de récentes évolutions industrielles bouleversent les pratiques dans le domaine, les technologies standard devenant de plus en plus attrayantes pour réaliser des circuits durcis aux radiations. Du fait de leurs fréquences élevées, des nouvelles architectures de transistor et des temps de durcissement réduits, les puces fabriquées suivant les derniers procédés CMOS posent de nombreux défis. Ce travail s’attelle donc à la

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41

Fedorková, Lucie. "Metody stabilizace nestabilních řešení diskrétní logistické rovnice." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400443.

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Diplomová práce pojednává o stabilizaci diskrétního logistického modelu pomocí několika řídících metod. Je zde provedena především stabilizace rovnováh, 2-periodických cyklů a 3-periodických cyklů. Ke stabilizaci systému je využito proporčního zpětně-vazebního řízení, zpětně-vazebního řízení s časovým zpožděním a řízení založeného na predikci. U každé metody je diskutovaná stabilizační množina pro řídící zesilovač spolu s oblastmi stability pro odpovídající kontrolovaná řešení. Všechny teoretické výsledky jsou ilustrovány grafickými interpretacemi v softwaru MATLAB. Podpůrné výpočty jsou prove

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Lafleur, Jean-Roch. "Rendez-vous autonome en orbite martienne selon les méthodes non-linéaires des commandes par modes glissants et rétroactions linéarisées." Mémoire, Université de Sherbrooke, 2007. http://savoirs.usherbrooke.ca/handle/11143/1389.

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Les technologies actuelles d'exploration interplanétaire ne nous permettent pas encore d'envoyer des humains à bord des véhicules spatiaux. D'ici à ce que cet exploit se réalise, l'exploration planétaire se fera à l'aide de véhicules robotisés qui auront à s'adapter de façon efficace, intelligente et autonome aux incertitudes environnementales. L'autonomie voulue à bord de ces engins peut être difficilement atteinte avec les méthodes de commande linéaire classique, présentement en usage. Ce projet de maîtrise vise à évaluer deux techniques novatrices de commandes non-linéaires, appliquées au r

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Lafleur, Jean-Roch. "Rendez-vous autonome en orbite martienne selon les méthodes non-linéaires des commandes par modes glissants et rétroactions linéarisées." [S.l. : s.n.], 2007.

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SILVA, NATALIA F. da. "Estabelecimento de um sistema padrão primário para raios X baixas com uma câmara de ionização de ar livre de energias." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26382.

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Submitted by Claudinei Pracidelli (cpracide@ipen.br) on 2016-06-22T12:43:46Z No. of bitstreams: 0<br>Made available in DSpace on 2016-06-22T12:43:46Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado em Tecnologia Nuclear)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Eshagh, Mehdi. "On Satellite Gravity Gradiometry." Doctoral thesis, Stockholm : Skolan för arkitektur och samhällsbyggnad, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10429.

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Salazar, Kardozo Alexandros. "A High-Level Framework for the Autonomous Refueling of Satellite Constellations." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14534.

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Satellite constellations are an increasingly attractive option for many commercial and military applications. They provide a robust and distributed method of accomplishing the goals of expensive monolithic satellites. Among the many challenges that satellite constellations engender (challenges in control, coordination, disposal, and other areas), refueling is of particular interest because of the many methods one can use to refuel a constellation and the lifetime implications on the satellites. The present work presents a methodology for carrying out peer-to-peer refueling maneuvers within a

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LaPointe, Jamie J., and Jamie J. LaPointe. "Adaptive Estimation Techniques for Resident Space Object Characterization." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/623263.

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This thesis investigates using adaptive estimation techniques to determine unknown model parameters such as size and surface material reflectivity, while estimating position, velocity, attitude, and attitude rates of a resident space object. This work focuses on the application of these methods to the space situational awareness problem. This thesis proposes a unique method of implementing a top-level gating network in a dual-layer hierarchical mixture of experts. In addition it proposes a decaying learning parameter for use in both the single layer mixture of experts and the dual-layer hierar

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Piltz, Sofia Helena. "Models for adaptive feeding and population dynamics in plankton." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:811fd94d-d58e-48fa-8848-ad7dc37a099f.

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Traditionally, differential-equation models for population dynamics have considered organisms as "fixed" entities in terms of their behaviour and characteristics. However, there have been many observations of adaptivity in organisms, both at the level of behaviour and as an evolutionary change of traits, in response to the environmental conditions. Taking such adaptiveness into account alters the qualitative dynamics of traditional models and is an important factor to be included, for example, when developing reliable model predictions under changing environmental conditions. In this thesis, w

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Santos, Ignacio. "Simulation and Study of Gravity Assist Maneuvers." Thesis, KTH, Rymdteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276462.

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This thesis takes a closer look at the complex maneuver known as gravity assist, a popular method of interplanetary travel. The maneuver is used to gain or lose momentum by flying by planets, which induces a speed and direction change. A simulation model is created using the General Mission Analysis Tool (GMAT), which is intended to be easily reproduced and altered to match any desired gravity assist maneuver. The validity of its results is analyzed, comparing them to available data from real missions. Some parameters, including speed and trajectory, are found to be extremely reliable. The mod

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MAMMARELLA, MARTINA. "A Comprehensive Modeling Framework for Integrated Mission Analysis and Design of a Reusable Electric Space Tug." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2750013.

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"Earth is a small town with many neighborhoods in a very big universe." The quote of the American Astronaut Ronald John Garan Jr. perfectly summarizes the universal and enduring mankind's interest in exploring the unknown, discovering new worlds, pushing the boundaries of scientific and technical limits further and beyond. More than a half century ago, during a speech delivered at Rice University in Houston, President John F. Kennedy claimed the Moon as the new frontier for the human space exploration. The outstanding achievements of the Apollo mission pushed the research in space across the s

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