Дисертації з теми "Global gravity"
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Ceriotti, Matteo. "Global optimisation of multiple gravity assist trajectories." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/2003/.
Повний текст джерелаDando, Owen Robert. "Topological defects in low-energy string gravity." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/4496/.
Повний текст джерелаHan, Shin-Chan. "Efficient global gravity field determination from satellite-to-satellite tracking." Columbus, Ohio : Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1061995200.
Повний текст джерелаTitle from first page of PDF file. Document formatted into pages; contains xvii, 198 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Christopher Jekeli, Dept. of Geodetic Science and Surveying. Includes bibliographical references (p. 192-198).
Bai, Lu. "Effects of global financial crisis on Chinese export: a gravity model study." Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Economics, Finance and Statistics, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-18297.
Повний текст джерелаWöhr, Andreas J. [Verfasser], and Stefan [Akademischer Betreuer] Teufel. "Global Formalism of Loop Quantum Gravity / Andreas J. Wöhr ; Betreuer: Stefan Teufel." Tübingen : Universitätsbibliothek Tübingen, 2014. http://d-nb.info/1163236373/34.
Повний текст джерелаWerth, Susanna. "Calibration of the global hydrological model WGHM with water mass variations from GRACE gravity data." Phd thesis, Universität Potsdam, 2010. http://opus.kobv.de/ubp/volltexte/2010/4173/.
Повний текст джерелаDas Schwerefeld der Erde spiegelt die Verteilung von Massen auf und unter der Erdoberfläche wieder. Umverteilungen von Erd-, Luft- oder Wassermassen auf unserem Planeten sind damit über eine kontinuierliche Vermessung des Erdschwerefeldes beobachtbar. Besonders Satellitenmissionen sind hierfür geeignet, da deren Umlaufbahn durch zeitliche und räumliche Veränderung der Schwerkraft beeinflusst wird. Seit dem Start der Satellitenmission GRACE (Gravity Recovery And Climate Experiment) im Jahr 2002 stellt die Geodäsie daher globale Daten von zeitlichen Veränderungen des Erdschwerefeldes mit hoher Genauigkeit zur Verfügung. Mit diesen Daten lassen sich geophysikalische und klimatologische Massenumverteilungen auf der Erdoberfläche studieren. GRACE liefert damit erstmals Beobachtungen von Variationen des gesamten kontinentalen Wasserspeichers, welche außerordentlich wertvoll für die Analyse des Wasserkreislaufes über große Regionen sind. Die Daten ermöglichen die Überprüfung von großräumigen mathematischen Modellen der Hydrologie, welche den natürlichen Kreislauf des Wassers auf den Kontinenten, vom Zeitpunkt des Niederschlags bis zum Abfluss in die Ozeane, nachvollziehbar machen. Das verbesserte Verständnis über Transport- und Speicherprozesse von Süßwasser ist für genauere Vorhersagen über zukünftige Wasserverfügbarkeit oder potentielle Naturkatastrophen, wie z.B. Überschwemmungen, von enormer Bedeutung. Ein globales Modell, welches die wichtigsten Komponenten des Wasserkreislaufes (Boden, Schnee, Interzeption, Oberflächen- und Grundwasser) berechnet, ist das "WaterGAP Global Hydrology Model" (WGHM). Vergleiche von berechneten und beobachteten Wassermassenvariationen weisen bisher insbesondere in der jährlichen Amplitude deutliche Differenzen auf. Sehr große Unterschiede zwischen verschiedenen hydrologischen Modellen betonen die Notwendigkeit, deren Berechnungen zu verbessern. Zu diesem Zweck verbindet GRACE die Wissenschaftsbereiche der Geodäsie und der Hydrologie. Diese Verknüpfung verlangt von beiden Seiten die Entwicklung geeigneter Methoden zur Datenintegration, welche die Hauptaufgaben dieser Arbeit darstellten. Dabei handelt es sich insbesondere um die Auswertung der GRACE-Daten mit möglichst hoher Genauigkeit sowie um die Entwicklung einer Strategie zur Integration von GRACE Daten in das hydrologische Modell. Mit Hilfe von GRACE wurde das Modell neu kalbriert, d.h. Parameter im Modell so verändert, dass die hydrologischen Berechnungen besser mit den GRACE Beobachtungen übereinstimmen. Dabei kam ein multikriterieller Kalibrieralgorithmus zur Anwendung mit dem neben GRACE-Daten auch Abflussmessungen einbezogen werden konnten. Die Modellkalibierung wurde weltweit für die 28 größten Flusseinzugsgebiete durchgeführt. In den meisten Fällen konnte eine verbesserte Berechnung von Wassermassenvariationen und Abflüssen erreicht werden. Hieraus ergeben sich, z.B. für tropische Regionen, größere saisonale Variationen. Die Ergebnisse führen zu einem verbesserten Verständnis hydrologischer Prozesse. Zum Schluss konnte die Robustheit der Ergebnisse gegenüber Fehlern in GRACE- und Abflussmessungen erfolgreich getestet werden. Nach den wichtigsten Schlussfolgerungen, die aus den Ergebnissen abgeleitet werden konnten, sind nicht nur Bodenfeuchte- und Schneespeicher, sondern auch Grundwasser- und Oberflächenwasserspeicher in Vergleiche von berechneten und GRACE-beobachteten Wassermassenvariationen einzubeziehen. Weiterhin sind neben Abflussmessungen zusätzlich Beobachtungen von weiteren hydrologischen Prozessen notwendig, um die Ergebnisse mit größerer Genauigkeit überprüfen zu können. Die Ergebnisse dieser Arbeit heben hervor, wie wertvoll GRACE-Daten für die großräumige Hydrologie sind und eröffnen eine Methode zur Verbesserung unseres Verständnisses des globalen Wasserkreislaufes.
Wan, Mohd Akib Wan Abdul Aziz. "A preliminary determination of a gravimetric geoid in Peninsular Malaysia." Thesis, University College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283665.
Повний текст джерелаBeres, Jadwiga H. "Gravity waves generated by tropical convection : generation mechanisms and implications for global circulation models /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/10048.
Повний текст джерелаLiu, Xianglin. "Global gravity field recovery from satellite-to-satellite tracking data with the acceleration approach /." Delft : NCG Nederlandse Commissie voor Geodesie, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?u20=9789061323096.
Повний текст джерелаBergmann-Wolf, Inga [Verfasser]. "Oceanographic applications of GRACE gravity data on global and regional scales / Inga Bergmann-Wolf." Berlin : Freie Universität Berlin, 2016. http://d-nb.info/1082237965/34.
Повний текст джерелаCai, Zhiyuan. "Global Mohorovicic Discontinuity Estimates Based on Isostatic Theories Using Gravity Data and Seismic Models." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu159455139426099.
Повний текст джерелаBryan, Jason M. "GLOBAL OPTIMIZATION OF MGA-DSM PROBLEMS USING THE INTERPLANETARY GRAVITY ASSIST TRAJECTORY OPTIMIZER (IGATO)." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/663.
Повний текст джерелаCrespo, Cuaresma Jesus, Mathias Moser, and Anna Raggl. "On the Determinants of Global Bilateral Migration Flows." European Commission, bmwfw, 2013. http://epub.wu.ac.at/4715/1/WWWforEurope_WPS_no005_MS14.pdf.
Повний текст джерелаSeries: WWWforEurope
Li, Xiaopeng. "Moving base INS/GPS vector gravimetry on a land vehicle." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1195677222.
Повний текст джерелаBrockmann, Jan Martin [Verfasser]. "On High Performance Computing in Geodesy : Applications in Global Gravity Field Determination / Jan Martin Brockmann." Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1077268998/34.
Повний текст джерелаBaier, Fabian [Verfasser]. "A Gravity Approach to Regional and Global Investment Dynamics: Theory and Empirical Findings / Fabian Baier." Wuppertal : Universitätsbibliothek Wuppertal, 2019. http://d-nb.info/1206120916/34.
Повний текст джерелаTrinh, Quang Thai [Verfasser]. "Properties of convective gravity waves derived by combining global modeling and satellite observations / Quang Thai Trinh." Wuppertal : Universitätsbibliothek Wuppertal, 2016. http://d-nb.info/1120027616/34.
Повний текст джерелаMariani, Patrizia. "Caratterizzazione della struttura litosferica del bacino intracratonico del Parana' (Sud America) mediante modellazione di dati gradiometrici e gravimetrici da satelliti di nuova generazione (GRACE e GOCE)." Doctoral thesis, Università degli studi di Trieste, 2012. http://hdl.handle.net/10077/7393.
Повний текст джерелаRiassunto: La finalità di questo studio è la caratterizzazione della litosfera sottostante il bacino intracratonico del Paraná. I modelli gravimetrici adottati sono vincolati ai dati geofisici tra i quali quelli sismologici più recenti (Lloyd et al., 2010) e sono corroborati dai modelli petrografici (Bryan & Ernst, 2008). Si offre un approccio che include la comparazione isostatica a quella sismologica al fine di interpretare al meglio la struttura litosferica nell’area del bacino in analisi e di comprendere le variazioni geodinamiche legate alle province geologiche ivi presenti. Il bacino del Paraná (Sud America) è ubicato nella piattaforma stabile del Sud America, ed è circondato da cratoni tra i quali: il cratone amazzonico, il cratone di San Francisco e il Rio de La Plata. La sua genesi in epoca paleozoica è quella di vasto bacino sedimentario, sul quale però durante il Mesozoico (Cretaceo inferiore) si è sviluppata un’intensa attività vulcanica (Capitolo 3). Quest’attività effusiva lo classifica tra le maggiori LIP (Large Igneous Province) mondiali, provincie magmatiche con volume di materiale espulso superiore a 0.1 Mkm3 (Bryan & Ernst, 2008). L’analisi effettuata in questo lavoro è eseguita tramite lo studio del campo gravimetrico da modelli di nuova generazione derivanti dal satellite GOCE (Gravity field and steady state Ocean Circulation Explorer) e GRACE (Gravity Recovery and Climate Experiment). I prodotti gravimetrici satellitari di GOCE possiedono una risoluzione senza precedenti (mezza lunghezza d’onda 80 km): ciò consente di validare i modelli gravimetrici precedenti (280 km, EGM08, Pavlis et al., 2008) che per offrire una maggior dettaglio nelle anomalie integravano ai dati satellitari di GRACE le campagne gravimetriche terrestri, non sempre complete e quindi globalmente precise e di adempire agli indispensabile fini di interpretazione geodinamica. La descrizione dei modelli e la validazione degli stessi sono offerte nel Capitolo 2. I campi potenziali studiati per le principali province geologiche sono illustrati nel Capitolo 5; mentre nel Capitolo 6 si applica la metodologia spettrale sulla seconda derivata verticale del potenziale per discernere le diverse litologie individuate nell’area di studio. L’anomalia di Bouguer calcolata tramite sviluppo in armoniche sferiche viene corretta sia in superficie e in profondità stimando l’effetto di gravità dei sedimenti conosciuti (Capitolo 4) e le conoscenze geofisiche note. Il bacino è composto da: i sedimenti pre-vulcanici paleozoici di spessore pari a circa 3500 m, la Formazione Serra Geral composta principalmente da basalti tholeiitici del cretaceo inferiore (~1500 m di spessore), ed infine i sedimenti post-vulcanici del cretaceo superiore appartenenti al Gruppo Bauru, solo 300 m di spessore (Capitolo 3). Sfruttando i modelli sismologici regionali è stato infine possibile valutare anche il contributo gravimetrico dello spessore crostale stimato con la sismologia. Con questi elementi viene calcolata la Bouguer residua, che è interpretata come anomalia isostatica e quindi correlata alle strutture geologiche locali e regionali. Questo comporta il riconoscimento di una struttura anomala sotto la parte settentrionale del bacino del Paraná comprendente anche parte del settore adiacente Blocco del Guaporé. L’inquadramento a scala maggiore però permette di evidenziare un’area molto più ampia di quanto riconosciuto in prima istanza. Tale anomalia è centrata infatti nel nucleo archeano del cratone amazzonico, di cui quindi il bacino del Paraná risulta solamente il suo braccio più meridionale. In assenza di attività tettonica-magmatica recente (ultima risale 50 Ma) ed in mancanza di grandi anomalie superficiali, tale anomalia positiva potrebbe essere inserita in un contesto regionale e più profondo, rappresentando delle dinamiche di mantello. Infine tramite inversione gravimetrica è stata quantificata numericamente l’anomalia nel bacino di studio utilizzando la geometria semplice di un tronco di cono. La quantità di materiale in presunto underplating che dovrebbe spiegare l’anomalia positiva è compatibile ai modelli petrografici conosciuti. Tali modelli sottolineano come la presenza di un magmatismo noto in superficie rappresenti solo una piccola parte di quello che dovrebbe trovarsi in intrusione: è stato calcolato infatti che il magmatismo superficiale potrebbe rappresentare solo la decima parte di quello associato in profondità.
Abstract: Goal of this study is the characterization of the lithosphere beneath the intracratonic area of Paraná basin. We formulate gravimetric models constrained by geophysical data and new seismological models (Lloyd et al., 2010) and also underpinned by petrographic models (Bryan & Ernst, 2008). Our approach includes isostatic Moho to seismological Moho comparison to better understand lithospheric structures in the area of basin, and geodynamic context of the local geological province. Paraná basin (South America) is located on the stable South American platform, and it is surrounded by some craton areas, as: the Amazon craton, the San Francisco craton and the Rio de La Plata Craton. During Paleozoic epoch the Paraná region was a wide sedimentary basin, while in the Mesozoic (Early Cretaceous) a significant volcanic activity developed on it. This effusive phase classifies the basin between the greatest LIP (Large Igneous Province) worldwide known, where the magmatism volume is greater than 0.1 Mkm3(Bryan & Ernst, 2008). We analyzed gravimetric field using new generation satellite models as GOCE (Gravity field and steady-state Ocean Circulation Explorer) and GRACE (Gravity Recovery and Climate Experiment). GOCE’s products gives unprecedented resolution (half wavelength: 80 km) helping to validate previous global gravity models as EGM08 (Pavlis et al., 2008). The 280 km satellite- only resolution was increased by integration of terrestrial gravity fields data, but this methodology added some problems during processing, where the terrestrial information is not complete or precise. On Chapter 2 some descriptions and validation among models are shown. We calculated potential field for the main geological provinces of Chapter 5; while in Chapter 6, using spectral methodology on the second vertical derivatives of potential field, we identify main lithologic units. The Bouguer anomaly calculated with the spherical harmonics expansion of the potential field is corrected by known stratigraphic units. The basin is made by pre-volcanic sediments of Paleozoic age, with over 3500 m of thickness, Serra Geral Formation, mainly tholeiitic basalts of Early Cretaceous (~1500 m), and post-volcanic sediment of Bauru Group, only 300 m of thickness. We evaluate the effect of crustal thickness variations on the gravity field by using the seismological crustal model. Removing these elements from the Bouguer anomaly, we obtain the residual Bouguer anomaly. Further we calculate the isostatic anomaly and we correlate it to the local and regional geological framework. This helps to recognize a positive residual anomaly on the northern part of the Paraná basin, including the nearby Guaporé Block. Setting a major scale we see the same phenomenon: it is in agreement with the archean nucleus of the Amazon craton, so we can claim that the anomaly on the Paraná is only the southern part of a greater positive area. The relative gravity positive anomaly in the Paraná basin is not very extended and lack of tectonic activity since50 Ma makes us consider that this anomaly is part of a deeper and greater anomaly, maybe due to mantle dynamic effects. We quantified the intracrustal density anomaly using gravity inversion and adopting a truncated cone geometry and volume in accord to petrographic models. It is known that an underplated magmatic body can be up to 10 time larger than the associated extrusive volume and this corroborates our models.
XXIV Ciclo
1979
Holland, Steven K. "Toward a More Inclusive Construct of Native Chinese Speaker L2 Written Error Gravity." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3477.
Повний текст джерелаCheng, Quan Jia. "A WLAN location estimation system using center of gravity as an algorithm selector." HKBU Institutional Repository, 2013. http://repository.hkbu.edu.hk/etd_ra/1513.
Повний текст джерелаMarchildon, Miguel. "An Application of the Gravity Model to International Trade in Narcotics." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37258.
Повний текст джерелаVenkat, Ratnam Madineni, and Christoph Jacobi. "Study on stratospheric gravity wave activity: global and seasonal variations deduced from the CHAllenging Minisatellite Payload (CHAMP)-GPS Satellite." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 30 = Meteorologische Arbeiten aus Leipzig ; 8 (2003), S. 136-148, 2003. https://ul.qucosa.de/id/qucosa%3A15246.
Повний текст джерелаZum ersten Mal werden globale Analysen der Schwerewellenaktivität, bestimmt unter Verwendung des CHAMP LEO-Satelliten, vorgestellt. Temperaturprofile der CHAMP/RO-Okkultationen werden zunächst mit bodengestützten Messungen verglichen. Generell ist die Übereinstimmung gut. Monatliche Mittelwerte der potentiellen Energie Ep, die als Maß für Schwerewellenaktivität gilt, wurden aus Radisonden- und CHAMP-Messungen bestimmt, wobei die CHAMP-Daten höhere Werte lieferten. Es existiert eine deutlicher Tagesgang von Ep. Die globale Morphologie der Schwerewellenaktivität zeigt hohe Werte nicht nur am Äquator, sondern auch in mittleren Breiten, dies aber nicht während der Äquinoktien. Dies weist darauf hin, dass Schwerewelleaktivität nicht nur orographisch angetrieben ist, sondern in verschiedenen Breiten vom Jahresgang abhängt. Die Breiten- und Höhenabhängigkeit der Schwerewellenaktivität zeigt zwischen 25 und 30 km niedrige, unterhalb von 25 km hohe Werte von Ep am Äquator. Während des Winters in der Südhemisphäre sind die Werte hoch, während zu den Äquinoktien hohe Werte in mittleren Breiten beider Hemisphären zu finden sind. Während der Solstitien zeigt die Ep-Verteilung stärkere hemisphärische Asymmetrie. Hohe Werte von Ep werden während des südpolaren Frühjahrs gemessen. Der äquatoriale Bereich hoher Varianz ist in allen Jahreszeiten außer im Winter breit (±300°).
Lerisson, Gaétan. "Stabilité d'une onde de gravité interne, analyse locale, globale et croissance transitoire." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX017/document.
Повний текст джерелаInternal gravity waves that exist in a continuously stratified fluid are particularly important in the ocean. They transport energy and are thought to generate turbulent mixing, which contribute to the deep ocean circulation.We generate an internal wave beam that propagates in a continuously stratified fluid with direct numerical simulations. This situation is equivalent to a tidal wave, where the tidal flow oscillates over a topography and generates a wave. Experimental results obtained by cite{Bourget13} are recovered, ie. the beam destabilizes into a small scale mode. We consider the effect of an horizontal mean flow on the instability and lower the forcing frequency in order to compensate for the doppler effect and to keep locally the same wave. A limit case appears when the forcing becomes stationary. This case is equivalent to a lee wave appearing when a stratified fluid flows over a topography.For small mean flow, small scale instabilities develop as in the tidal case. The beam then stabilizes at intermediate mean flows and destabilizes again for increasing flow speed. At this second threshold, down to the lee wave case, the instability is of much larger scale than for the tidal case. Varying the Reynolds number, the Froude number, the wave angle or the beam size doesn't affect the instability scale selection : a small scale instability in the tidal regime, and large scale instability in the lee regime.We show that the instability mechanism may be interpreted using the triadic instability. Scale selection corresponds to different branches of triadic resonance. We confirm the presence of a stability region for intermediate value of the mean advection velocity by computing the linear eigenmode as Floquet mode with an Arnoldi-Krylov technique and show that the leading eigenmode has a negative growth rate.In the lee wave, case the flow is unstable and a selective frequency damping method cite{Akervik06} is used to compute a steady base flow. We then implement a linear direct-adjoint method to compute the optimal perturbations that maximizes the total energy at different time horizons. At short time horizon, the optimal perturbation is small scale while at large time the perturbation switches to a large scale solution and converges to the large scale mode observed through the nonlinear simulations. Short time transients correspond to the small scale triadic instability advected by the flow whereas the long time large scale instability corresponds to large scale branch of the triadic instability that is able to sustain the flow.We propose an interpretation of the selection of these different instabilities in term of absolute and convective instability. In the case of the lee wave, the large scale instability is absolute whereas the small scale instability is convective (and dominates the short time transient growth because it has a larger local growth rate). When the mean flow is varied, the properties of small scale and large scale instabilities exchange: in the tidal case the short scale instability is absolute and the large scale convective. This conjecture is confirmed by computing the impulse response around a plane monochromatic internal gravity wave in an extended two dimensional periodic domain. The spatio temporal evolution of a perturbation localized in space and time points out the formation of three different wave packets corresponding to different branches of triadic instability. Using the triadic theory with finite detuning cite{McEwan77},we derive the group velocity at the maximum growth rate of the three different branches of triadic instability and find a good agreement with the velocity of the three wave paquet maxima in the impulse response. Analyzing the impulse response along rays, i.e. at x/t and z/tconstant, we compute the absolute growth rate along all possible rays and validate our conjecture
Ge, Shengjie. "GPS radio occultation and the role of atmospheric pressure on spaceborne gravity estimation over Antarctica." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1149070384.
Повний текст джерелаBedada, Tullu Besha. "Absolute geopotential height system for Ethiopia." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4726.
Повний текст джерелаRexer, Moritz [Verfasser], Christian [Akademischer Betreuer] [Gutachter] Hirt, Pavel [Gutachter] Novak, and Roland [Gutachter] Pail. "Spectral Solutions to the Topographic Potential in the context of High-Resolution Global Gravity Field Modelling / Moritz Rexer ; Gutachter: Pavel Novak, Christian Hirt, Roland Pail ; Betreuer: Christian Hirt." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1136422773/34.
Повний текст джерелаLu, Biao [Verfasser], Frank [Akademischer Betreuer] Flechtner, Frank [Gutachter] Flechtner, Wolf-Dieter [Gutachter] Schuh, and Matthias [Gutachter] Becker. "Global and regional gravity field recovery by combining satellite, air-shipborne and terrestrial gravimetry data / Biao Lu ; Gutachter: Frank Flechtner, Wolf-Dieter Schuh, Matthias Becker ; Betreuer: Frank Flechtner." Berlin : Technische Universität Berlin, 2019. http://d-nb.info/1190717603/34.
Повний текст джерелаRexer, Moritz Verfasser], Christian [Akademischer Betreuer] [Gutachter] Hirt, Pavel [Gutachter] Novak, and Roland [Gutachter] [Pail. "Spectral Solutions to the Topographic Potential in the context of High-Resolution Global Gravity Field Modelling / Moritz Rexer ; Gutachter: Pavel Novak, Christian Hirt, Roland Pail ; Betreuer: Christian Hirt." München : Universitätsbibliothek der TU München, 2017. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20170531-1349781-1-7.
Повний текст джерелаBetlach, František. "Studie napjatosti a přetvoření zděné přehrady." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240016.
Повний текст джерелаYang, Qian. "Applications of Satellite Geodesy in Environmental and Climate Change." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6440.
Повний текст джерелаDeville, Sabrina. "Caractérisation de la zone non saturée des karsts par la gravimétrie et l'hydrogéologie." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2013. http://tel.archives-ouvertes.fr/tel-00829346.
Повний текст джерелаLarson, Susan K. "The Origins of Four Paterae of Malea Planum, Mars." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1736.pdf.
Повний текст джерелаSilva, Geisiane Michelle da. "O impacto da crise financeira de 2008 sobre as exportações paranaenses: uma aplicação do modelo gravital." Universidade Estadual do Oeste do Parana, 2014. http://tede.unioeste.br:8080/tede/handle/tede/2153.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
The aim of this study was to analyze the impact of the 2008 financial crisis on Paraná´s exports through Gravity Model. The Gravity Equation estimated used as the dependent variable the exports of Paraná and as independent variables the Gross Domestic Product (GDP) and population of the state, GDP and population of importers countries of products from Paraná, the distance in kilometers between the state´s capital and the capital of the importer country, commodities prices in the international market, the area of importers countries and the dummies crisis, China, NAFTA, European Union and MERCOSUR. The Equation was estimated using panel data models by Pooled, Fixed Effects and Random Effects. The tests of Chow, Hausman and Breusch-Pagan LM indicated that the best model to be analyzed is the Random Effects. The tests of Breusch -Pagan and Wooldridge indicated, respectively, the presence of heteroscedasticity and autocorrelation. Thus, the Random Effects model was estimated with heteroscedasticity correction, with correction for autocorrelation and both fixes. According to the Equation estimated by the Random Effects model with heteroscedasticity and autocorrelation correction, the variables GDP and population of Paraná, GDP and population of importers countries and commodities prices were statistically significant and their coefficients showed, with the exception of the Paraná´s GDP, a positive relationship with the Paraná´s exports. The variables distance and area of importers countries were statistically insignificant and their coefficients showed an inverse relationship with exports of Paraná. The dummies China, NAFTA, European Union and MERCOSUR were statistically insignificant. Their coefficients showed a positive relationship between the Paraná´s exports and China and MERCOSUR and negative with NAFTA and the European Union. The dummy crisis was statistically significant, indicating that reduction in demand caused by the global financial crisis led to a reduction of 11,68% in Paraná´s exports. However, between 2008 and 2009, the Paraná´s exports fell by 26,3%. Thus, the occurrence of crisis partially explained the drop in exports of Paraná between 2008 and 2009. This can be explained by non-tariff barriers imposed by countries in response to the financial crisis.
O objetivo deste estudo foi analisar o impacto da crise financeira de 2008 nas exportações do Paraná através do Modelo Gravitacional. A Equação Gravitacional estimada utilizou como variável dependente as exportações do Paraná e como variáveis independentes o Produto Interno Bruto (PIB) e a população do estado, o PIB e a população dos países importadores de produtos paranaenses, a distância em quilômetros entre a capital do estado e a capital do país importador, o preço das commodities no mercado internacional, a área dos países importadores e as dummies crise, China, NAFTA, União Europeia e MERCOSUL. A Equação foi estimada por meio de dados em painel pelos modelos Pooled, de Efeitos Fixos e de Efeitos Aleatórios. Os testes de Chow, Hausman e LM de Breusch-Pagan indicaram que o melhor modelo a ser analisado é o de Efeitos Aleatórios. Os testes de Breusch-Pagan e de Wooldridge indicaram, respectivamente, a presença de heterocedasticidade e de autocorrelação. Assim, o modelo de Efeitos Aleatórios foi estimado com correção de heterocedasticidade, com correção de autocorrelação e com ambas as correções. De acordo com a Equação estimada pelo modelo de Efeitos Aleatórios com correção de heterocedasticidade e autocorrelação, as variáveis PIB e população paranaense, PIB e população dos países importadores e preço das commodities foram estatisticamente significativas e seus coeficientes indicaram, com exceção do PIB do Paraná, relação positiva com as exportações paranaenses. As variáveis distância e área dos países importadores foram estatisticamente insignificantes e seus coeficientes mostraram uma relação inversa com as exportações do Paraná. As dummies China, NAFTA, União Europeia e MERCOSUL foram estatisticamente insignificantes. Seus coeficientes indicaram relação positiva entre as exportações paranaenses e a China e o MERCOSUL e negativa com o NAFTA e a União Europeia. A dummy crise foi estatisticamente significativa, indicando que redução da demanda global ocasionada pela crise financeira acarretou redução de 11,68% nas exportações paranaenses. Entretanto, entre 2008 e 2009, as exportações paranaenses apresentaram queda de 26,3%. Assim, a ocorrência da crise explicou parcialmente a queda das exportações do Paraná entre 2008 e 2009. Isto pode ser justificado pelas barreiras não tarifárias impostas pelos países em resposta à crise financeira.
Norin, Elvira. "Barnmorskors arbetsuppgifter mot gravida kvinnor : En intervjustudie om hur barnmorskor arbetar samt vilka frågor och funderingar kvinnorna har." Thesis, Högskolan i Gävle, Avdelningen för arbets- och folkhälsovetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-27079.
Повний текст джерелаRosat, Séverine. "Variations temporelles de la gravité en relation avec la dynamique interne de la Terre - Apport des gravimètres supraconducteurs." Phd thesis, Université Louis Pasteur - Strasbourg I, 2004. http://tel.archives-ouvertes.fr/tel-00144439.
Повний текст джерелаNous nous consacrons à la recherche du mode propre de translation de la graine 1S1 qui n'a jamais été observé sans ambiguïté. Sa détection est primordiale car elle permettrait de contraindre le saut de densité à l'interface graine - noyau liquide, ainsi que la viscosité à cette interface et la stratification du noyau fluide. Pour cela nous développons des méthodes de sommation, de détection automatique des signaux et une famille d'ondelettes.
Yaseen, Hafiz Muhammad. "Modélisation de l'infection par le chikungunya(CHIK), de son impact, et des facteurs pronostiques de chronicité et de qualité de vie post-CHIK." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM5008.
Повний текст джерелаTo model the evolution of chikungunya virus (CHIK) infection, its impact and the prognostic factors of post-CHIK rheumatism and quality of life, we worked in three parts. The long-term impact of the 2005-2006 CHIK outbreaks in Reunion Island was estimated by calculating the proportion of chronic patients over time and the global burden of CHIK using the Disability Adjusted Life Years (DALY) method. This method sums the years of life lost due to premature mortality and the years lived with disability. Between 51.2 and 65.3% of patients were estimated chronic after 1 year and 0%-15.2% after 5 years. The global disease burden of CHIK was estimated 65-73 DALYs/1000 persons, 55.5% concerning the active population (20-60 years old), and 86% due to persistence of post-CHIK rheumatisms. Prognostic factors of the long-term (30 months) rheumatisms and impaired quality of life (QoL) were studied in a cohort of French army policemen (25% CHIK infected: CHIK+). Being CHIK+, suffering of comorbidity and having depressed mood during the acute stage were predictive for both persistent arthritis and arthralgias at 30 months. In addition, suffering of either arthralgias or arthritis at six months was predictive of the same symptoms at 30 months. Determinants of impaired QoL were CHIK infection and comorbidity, in addition to older age, work-stoppage during the acute infection and arthritis at 6 months for the QoL physical component, and depressed mood at 6 months for the mental health component.Association between the severity of initial CHIK-stages and recovery were studied using multiple correspondence analysis (MCA)
Julié, Félix-Louis. "Sur le problème à deux corps et le rayonnement gravitationnel en théories scalaire-tenseur et Einstein-Maxwell-dilaton." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC131/document.
Повний текст джерелаWith the birth of "gravitational wave astronomy" comes the opportunity to test general relativity and its alternatives in a strong field regime that had never been observed so far: that of the coalescence of a compact binary sytem. This thesis studies the problem of motion and gravitational radiation from such systems in modified gravities, by adapting some of the key analytical tools that were first developed in the context of general relativity. First, we show how to widen the "effective-one-body" (EOB) formalism to a large class of modified gravities, including, e.g., scalar-tensor theories. In the latter, the gravitational interaction is described by supplementing general relativity with a (massless) scalar degree of freedom. The corresponding two-body lagrangian being known at post-post-keplerian order, we build an associated EOB hamiltonian, which describes the motion of a test particle orbiting in effective external fields. This enables to simplify and resum the two-body dynamics; and hence, to explore the strong-field regime near merger. We then "tackle", for the first time, the analytical description of "hairy" binary black hole systems, and obtain their (EOB) gravitational waveform counterparts in Einstein-Maxwell-dilaton theories, which generalize scalar-tensor theories by means of a (massless) vector field. To that end, we derive the two-body lagrangian at post-keplerian order as well as the energy flux radiated at infinity at quadrupolar order. As in general relativity, our developments rely on the phenomenological description of the black hole’s trajectories as worldlines of point particles that are, in turn, described by a "skeleton" action generalizing that of general relativity. Finally, we develop a formalism based on Katz’ "superpotentials" to define the mass (as a nœther charge) of a black hole that is endowed with vector and scalar "hair". We then deduce the first law of thermodynamics, which is particularly suitable to describe its readjustments when interacting with a faraway companion. Black hole thermodynamics is lastly shown to be a powerful tool to interpret and discuss the scope of their "skeletonization"
Perosanz, Félix. "Utilisation des mesures GPS pour la restitution dynamique précise d'orbites et l'amélioration des modèles globaux de champ de gravité terrestre : application au satellite TOPEX/POSEIDON et à la simulation des performances des futures missions géodésiques." Toulouse 3, 1995. http://www.theses.fr/1995TOU30183.
Повний текст джерелаBrunswic, Léo. "Surfaces de Cauchy polyédrales des espaces temps plats singuliers." Thesis, Avignon, 2017. http://www.theses.fr/2017AVIG0420/document.
Повний текст джерелаThe study of singular flat spacetimes with polyhedral Cauchy-surfaces is motivated by the quantum gravity toy model role they play in the seminal work of Deser, Jackiw and 'T Hooft. This thesis study parametrisations of classes of singular flat spacetimes : Cauchy-compact maximal flat spacetimes with massive and BTZ-like singularities. Two parametrisations are constructed. The first is based on an extension of Mess theorem to flat spacetimes with BTZ and Penner-Epstein convex hull construction. The second is based on a generalisation of Alexandrov polyhedron theorem to radiant Cauchy-compact flat spacetimes with massive and BTZ-like singularities. This work also initiate a wider theoretical background that encompass singular spacetimes
Chu, Yun-Wen, and 朱韻雯. "Entrepreneurship and Global Capital Flows: A Gravity Model Approach." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2jbp64.
Повний текст джерела國立政治大學
國家發展研究所
106
Entrepreneurs allocate resources based on market-driven forces. The entrepreneurship takes on different features and forms varying with the conditions of different social, cultural and economic context, and it gradually becomes the vital element for global economic development. This research is based on the national bilateral panel data of global securities and direct investment from the year 2003 to 2015, and it uses the Gravity Model to explore the entrepreneurship factors, such as social values, individual attributes and entrepreneurial activity, that had taken shape in different countries or under different economic entities. In terms of research method, Ordinary Least Squares and Panel Data Modal is used. The primary empirical result shows that the entrepreneurship factors have significant impact on capital flows generated from sources such as securities investment or direct investment. In other words, entrepreneurship has the effect of attracting capital flows. This research also proposes that the government shall consider the nature of policy objectives or the length of duration when making strategies or policies in stimulating entrepreneurship so as to attract appropriate capital forms.
徐欣瑩. "Improved Determinations of Global Gravity Anomaly Model and Shallow-Water Gravity Anomalies from Multi-Satellite Altimetry." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/86569664011620298902.
Повний текст джерелаLan, Chien-jung, and 藍健榕. "The Analysis of Global Transportation Service: The Analysis of Global Transportation Service:The Gravity Model Approach." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/99874406052906515948.
Повний текст джерела國立臺灣科技大學
企業管理系
97
This study focuses on the determinants of global transportation service trade between countries and regions. Using the augmented gravity model, our main result showed as fallows. First, the effect of economic size to transportation of import country service demand is greater than those of export countries. This implies that the global transportation service is pulling by demand ride rather than by supply ride. Secondly, total value of service industries has significant positive effort to international transportation service. Finally, the depreciation of Asian currencies positively increase Asian countries its transportation services export. However, the elasticity of relative exchange rate is insensitive for Europe transportation services export.
Jang, Rung-Jie, and 張榮傑. "Altimeter data processing for improved determination of global marine gravity." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/17435816462628299316.
Повний текст джерела國立交通大學
土木工程系
89
The altimeter database at the National Chiao Tung University, which includes data from Seasat, Geosat, ERS-1, ERS-2 and TOPEX/POSEIDON missions, is updated in this study in an attempt to derive marine gravity with an improved accuracy. The old Geosat/ERM and Geosat/GM are replaced by the JGM3 GDRS, which use better geophysical correction models compared to the previous version. For the tide model except for Seasat and T/P, the NAO99b model is used. A new method is used to remove outliers and compute averaged sea surface heights for the repeat missions. A more rigorous method of assigning standard deviations to the non-repeat missions is studied, but we conclude that an empirical standard deviation for each of the non-repeat mission will yield a better agreement between computed gravity anomalies and shipborne values. The optimum filter wavelengths for the altimeter data for the non-repeat missions are also empirically determined. Finally the inverse Vening Meinesz formula with the 1D FFT technique is used to compute gravity anomalies at 12 areas in the world ocean. Gridding of north and east components is done by least-squares collocation. On average the accuracy of the derived marine gravity anomalies is improved by 0.77 mgal compared to those of Hwang et al. (1998).
Thompson, Paul Frank. "Interpreting the Earth's time varying geopotential as observed from space and comparisons to global models of hydrologic transport." Thesis, 2004. http://hdl.handle.net/2152/1420.
Повний текст джерелаThompson, Paul Frank Tapley Byron D. "Interpreting the Earth's time varying geopotential as observed from space and comparisons to global models of hydrologic transport." 2004. http://repositories.lib.utexas.edu/bitstream/handle/2152/1420/thompsonp86692.pdf.
Повний текст джерелаKao, Eu-Chi, and 高豫麒. "Global marine gravity anomalies from Seasat, Geosat, ERS-1 , TOPEX/POSEIDON Satellite altimetry." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/45424798899045138694.
Повний текст джерела國立交通大學
土木工程研究所
85
Global marine gravity anomalie at a 2''×2'' grid have been determined from Seasat, Geosat, ERS-1 and TOPEX/POSEIDON altimeter data. The inverse Vening Meinesz formula with an 1D FFT method was used to compute gravity anomalies from gridded north-south and west-east geoid gradients, in a remove-restore procedure with the EGM96 gravity model as the reference field. The data cover the area 72°S to 72°N in latitude and 0° to 360° in iongitude. In the 12 test areas where ship gravity and satellite-derived gravity were compared, rms agreenents of 6-10 mgals were obtained and the gravity anomalies derived in this work are 0.5 mgal on average better than those derived by Sandwell and Smith (1997). The gravity anomalies are located at an ftp site (ftp://gps. cv.nctu.edu.tw) where an application grogram is available for extracting data in a subarea.
Lin, Kuen-Feng, and 林崑峯. "The determinant factor of global migration flows:the application of gravity model and trade networks analysis." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/59361362871069705272.
Повний текст джерела世新大學
財務金融學研究所(含碩專班)
99
In recent years, a substantial increase in international migration of population. According to the latest statistical data of DESA (United Nations Department of Economic and Social Affairs), it will increase to more 200 million people that were the total number of the world population of 3.1% in 2010. Total fertility rate of Taiwan is 1.03% that was the last ranking of the world in 2009. Taiwan could refer to foreign experience “international migration”, and it an important strategy to solve the population problem. Before attract the international immigration, this study analyze the determinant factor driver of global migration. This research use global bilateral migration data of 226 countries and 51076 samples. Also use the indicators of communications networks to demonstrate international migration by gravity model and measure determinant factors of international migration. Base on the theory and model of the Population Econometrics, this study examine the determinant factors of international population migration by the gravity model. Also, this research use social networks analysis to examine the positive and negative determinant factors of international population movement. The results indicate that the geographical and cultural factors, social and economic factors, and international trade factors with the application of gravity model and social networks analysis are significant impact on the international population migration. In the application of social networks analysis, trade centre networks and communications networks of the indicators in the global population migration play an important role.
Wang, Wei-Lung, and 王偉龍. "Shipborne gravity estimation from the combination of inertial measurement unit(IMU) and global positioning system (GPS)." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/08080784284787717959.
Повний текст джерела國立中興大學
水土保持學系所
102
The study is aimed at gravity estimation by using Inertial Measurement Unit(IMU) and Global Positioning System(GPS) data, and the accuracies of results are rigorously analyzed. The IMU and GPS data are from the proposal 「Shipborne gravity survey over the inshore areas of Taiwan」 sponsored by National Land Surveying and Mapping Center (NLSC) in 2011. In the step of data pre-processing, we consider different filter techniques and widths to determine a best filter combination according to the correlation coefficients and standard deviations between GPS and IMU data. Gaussian filter is adopted again to eliminate data noises in the step of gravity computation. The results are evaluated both by ZLS ship-derived and by EGM08-derived gravity. We conclude that (1) Gaussian and Cosine arch filters both exhibit more excellent results than others. (2) In Route 0514c, the best correlation coefficient 0.88 are occurred when the Gaussian filter widths use 5.5 s for IMU, and 2 s for GPS. (3) In Route 0519a, the best correlation coefficient 0.88 are occurred when the Gaussian filter widths use 5.0 and 1 s for IMU and GPS, respectively. (4) Route 2-2 show the best result that the accuracies reach 40 ? 50 mgal at Gaussian filter widths 200 ? 500s, and reach 20 ? 30 mgal at 1000 ? 1500 s.
"Development of a small university satellite for performing a global survey of gravity waves in the mesosphere." UNIVERSITY OF ILLINOIS AT URBANA-CHAMPAIGN, 2009. http://pqdtopen.proquest.com/#viewpdf?dispub=3347577.
Повний текст джерелаWerth, Susanna [Verfasser]. "Calibration of the global hydrological model WGHM with water mass variations from GRACE gravity data / Susanna Werth." 2010. http://d-nb.info/1002803667/34.
Повний текст джерела