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Dissertations / Theses on the topic 'Precession'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Gilmore, Keith. "Precession Damping in Itinerant Ferromagnets." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/gilmore/GilmoreK1207.pdf.

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Precession damping in metallic ferromagnets had been assumed to result from the spinorbit interaction. While several theories of spin-orbit damping had been postulated, no convincing numerical comparisons to data existed. We selected one promising theory and performed first-principles numerical calculations of damping for bulk iron, cobalt, and nickel. Comparison of minimal calculated and measured damping rates demonstrated a 70 % agreement for nickel, 60 % for iron, and 40 % for cobalt. We then relaxed the initial constraint of a universal electron-lattice scattering rate by allowing the scat

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2

Oleynikov, Peter. "Exploiting reciprocal space : electron diffraction, textures and precession /." Stockholm : Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, Stockholms universitet, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-791.

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3

Rolfe, Daniel James. "Accretion flow and precession phenomena in cataclysmic variables." Thesis, n.p, 2001. http://library7.open.ac.uk/abstracts/page.php?thesisid=52.

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4

Derakhshan, Jamal Jon. "Innovations Involving Balanced Steady State Free Precession MRI." Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1247256364.

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Thesis (Ph.D.)--Case Western Reserve University, 2009<br>Title from PDF (viewed on 19 August 2009) Department of Biomedical Engineering Includes abstract Includes bibliographical references Available online via the OhioLINK ETD Center

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5

Venâncio, Tiago. "\"Novas aplicações da precessão livre em onda contínua em ressonância magnética nuclear de baixa e alta resolução\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-18012007-093344/.

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Neste trabalho foi desenvolvido um estudo sobre a precessão livre de onda contínua (CWFP-continuous wave free precession), uma condição especial da precessão livre no estado estacionário (SSFP), e algumas aplicações. Os resultados experimentais, e de simulações, mostraram que este sinal é atingido após a passagem por dois estágios iniciais. O primeiro é dependente da não homogeneidade do campo magnético, relacionado a razão Tp/T2*. O segundo, o qual é chamado de estado quasi-estacionáio, é dependente ambos os tempos de relaxação do sistema em estudo, T1 e T2. Este segundo estágio é responsável

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6

Nobes, David Scott. "The generation of large-scale structures by jet precession /." Title page, abstract, and contents only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phn7444.pdf.

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7

White, Thomas Ashley. "Structure solution using precession electron diffraction and diffraction tomography." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611748.

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8

Xu, Jing. "Modeling and simulation of spin transport and precession in silicon." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 69 p, 2008. http://proquest.umi.com/pqdweb?did=1601517971&sid=9&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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9

Larwood, John Dail. "The tidally induced warping, precession and truncation of accretion discs." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268037.

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10

Vautrin, Christopher. "Electronic spin precession in all solid state magnetic tunnel transistor." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0075/document.

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Ce travail porte sur la précession du spin d’électrons chauds polarisés en spin. Celle-ci est induite par le champ d’échange d’une couche mince ferromagnétique dans une structure multicouche. La précession du spin électronique a déjà été mesurée dans des matériaux ferromagnétiques mais uniquement pour des électrons qui possèdent une énergie supérieure à 4eV au-dessus du niveau de Fermi. L’objectif premier de cette thèse est de mesurer la précession du spin de l’électron pour des faibles énergies, comprises entre 0.7eV et 2eV au-dessus du niveau de Fermi. Pour ce faire, un transistor tunnel mag

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11

Marino, Michael A. "Precession damping and axial velocity control of a lightweight reentry vehicle." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/41239.

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12

NOIR, JEROME. "Ecoulements d'un fluide dans une cavite en precession : approches numerique et experimentale." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10217.

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Nous savons aujourd'hui que le champ magnetique terrestre est cree au sein du noyau par des processus dynamo. Pour pouvoir comprendre la creation et l'evolution de ce champ nous devons connaitre la dynamique de la partie liquide du noyau terrestre. Le soleil et la lune exercent sur la terre un couple de gravite moyen entrainant un mouvement de precession de l'axe de rotation de notre planete. Comment le noyau liquide reagit-il a ce forcage luni-solaire ? pour pouvoir aborder cette question nous avons considere un modele physique simple constitue d'une cavite remplie d'eau dont nous imposons la

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13

Mendoza, Michael A. "Water Fat Separation with Multiple-Acquisition Balanced Steady-State Free Precession MRI." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4304.

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Magnetic resonance imaging (MRI) is an important medical imaging technique for visualizing soft tissue structures in the body. It has the advantages of being noninvasive and, unlike x-ray, does not rely on ionizing radiation for imaging. In traditional hydrogen-based MRI, the strongest measured signals are generated from the hydrogen nuclei contained in water and fat molecules.Reliable and uniform water fat separation can be used to improve medical diagnosis. In many applications the water component is the primary signal of interest, while the fat component represents a signal which can obscur

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14

Li, Jing. "Oblique Hanle effect in silicon spin transport devices." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 53 p, 2009. http://proquest.umi.com/pqdweb?did=1885755961&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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15

Moraes, Tiago Bueno de. "Precessão Livre no Estado Estacionário com alternância de fase para RMN em alta e baixa resolução." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-14102016-091634/.

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A aplicação de uma sequência de pulsos com tempo de repetição muito menor que os tempos de relaxação Tp << T2; T1, faz com que a magnetização atinja um estado estacionário descrito por H.Y. Carr como Estado Estacionário em Precessão Livre, Steady State Free Precession (SSFP). Nessa condição, o sinal é composto pela complexa sobreposição das componentes FID e eco. Sequências tipo SSFP são utilizadas na aquisição rápida de sinais, resultando em uma boa razão sinal ruído (s/r) em curto intervalo de tempo, porém introduzem fortes anomalias de fase e amplitude devido a complexa interação das compon

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16

Gyngell, M. L. "The application of steady-state free precession (SSFP) in 2d-Ft NMR imaging." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376522.

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17

Li, Fang. "An Analysis of the Linked-pulse in Steady-state Free Precession in MRI." PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4769.

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The steady-state free precession (SSFP) is one type of the fast scanning technique in MRI. So far most of its analysis are concentrated on the gradient echo SSFP (GR SSFP), very few paper~discuss the spin echo (SSFP (SE SSFP), and they are usually based on the simplified the hard pulse assumption. The advantage of the SE SSFP is that it can refocus the dephasing caused by the magnetic field inhomogeniety, which is the disadvantage of the GR SSFP. Also the hard pulse model can provide very limited information. The purpose of this paper is to establish the soft pulse model for both GR SSFP and S

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18

Liu, Yue. "Precession Electron Diffraction Assisted Characterization of Deformation in α and α+β Titanium Alloys". Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804946/.

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Ultra-fine grained materials with sub-micrometer grain size exhibit superior mechanical properties when compared with conventional fine-grained material as well as coarse-grained materials. Severe plastic deformation (SPD) techniques have been shown to be an effective way to modify the microstructure in order to improve the mechanical properties of the material. Crystalline materials require dislocations to accommodate plastic strain gradients and maintain lattice continuity. The lattice curvature exists due to the net dislocation that left behind in material during deformation. The characteri

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19

Ngassa, Tankeu Yvan Georges. "Affinement de structure par PEDT (Precession Electron Diffraction Tomography) dans des échantillons d’intérêt minéralogique." Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1R079.

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Depuis quelques années, une méthode de diffraction électronique utilisant la précession, la tomographie et le calcul dynamique des intensités diffractées permet la détermination des structures à l’échelle nanométrique. Nous présentons ici l’application de cette méthode à l’affinement de spinelles et d’orthopyroxènes ferromagnésiens, pour leur utilisation comme géothermomètre. Il s’agit de tester la sensibilité de la méthode pour la détermination des taux d’occupation, variables avec la température, des cations Fe2+ ou Fe3+ et Mg2+ sur les sites cristallographiques spécifiques des structures an

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Ngassa, Tankeu Yvan Georges. "Affinement de structure par PEDT (Precession Electron Diffraction Tomography) dans des échantillons d’intérêt minéralogique." Electronic Thesis or Diss., Université de Lille (2018-2021), 2018. http://www.theses.fr/2018LILUR079.

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Depuis quelques années, une méthode de diffraction électronique utilisant la précession, la tomographie et le calcul dynamique des intensités diffractées permet la détermination des structures à l’échelle nanométrique. Nous présentons ici l’application de cette méthode à l’affinement de spinelles et d’orthopyroxènes ferromagnésiens, pour leur utilisation comme géothermomètre. Il s’agit de tester la sensibilité de la méthode pour la détermination des taux d’occupation, variables avec la température, des cations Fe2+ ou Fe3+ et Mg2+ sur les sites cristallographiques spécifiques des structures an

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21

Денисов, Станіслав Іванович, Станислав Иванович Денисов, Stanislav Ivanovych Denysov, et al. "Lifetime of the precession mode of a nanoparticle magnetic moment in a rotating magnetic field." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20967.

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22

Giuly, Richard James. "Design and testing of a new conical beam precession system for high-throughput electron tomography." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p1457449.

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Thesis (M.S.)--University of California, San Diego, 2008.<br>Title from first page of PDF file (viewed November 13, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 163-164).

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23

Bullock, Matthew R. "Angular momentum precession, acquisition maneuver and attitude estimation design for SILA, a university micro-satellite project." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq22117.pdf.

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24

Bullock, Matthew R. (Matthew Robert) Carleton University Dissertation Engineering Mechanical and Aerospace. "Angular momentum precession, acquisition maneuver and attitude estimation design for SILA, a university micro satellite project." Ottawa, 1997.

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25

Chadwick, Angus. "Hippocampal theta sequences : from phenomenology to circuit mechanisms." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/22887.

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The hippocampus is a brain structure involved in episodic memory and spatial cognition. Neuronal activity within the hippocampus exhibits intricate temporal patterning, including oscillatory and sequential dynamics, which are believed to underlie these cognitive processes. In individual cells, a temporal activity pattern called phase precession occurs which leads to the organisation of neuronal populations into sequences. These sequences are hypothesised to form a substrate for episodic memory and the representation of spatial trajectories during navigation. In this thesis, I present a novel t

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26

Santos, Poliana Macedo dos. "Desenvolvimento da técnica de precessão livre no estado estacionário para aumento da razão sinal ruído em espectros de RMN de alta resolução." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-25082009-104418/.

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Neste trabalho realizou-se uma analise detalhada das vantagens e desvantagens da sequencia de Precessao Livre no Estado Estacionario (Steady State Free Precession - SSFP) para aquisicao rapida de espectros de Ressonancia Magnetica Nuclear (RMN) de 13C. O regime de SSFP e obtido atraves da aplicacao de um trem de pulsos de mesma fase, duracao e intensidade, separados por um intervalo de tempo (Tp) menor que os tempos de relaxacao longitudinal (T1) e transversal (T2) da amostra. Nestas condicoes e possivel acumular dezenas de espectros por unidade de T1, proporcionando um incremento significativ

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27

Girotti, Paolo. "Study of the systematics on the precession frequency measurement at the Muon g-2 experiment at Fermilab." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18039/.

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Il momento magnetico anomalo del muone a_mu = (g-2)/2 è una delle quantità conosciute con più precisione nella fisica, sia sperimentalmente che teoricamente. L'alto livello di accuratezza permette l'uso della misura di a_mu come test del Modello Standard (MS). In particolare, qualsiasi deviazione dal valore teorico del MS potrebbe essere dovuto a contributi fisici Oltre il Modello Standard (BSM). Il notevole risultato ottenuto dall'esperimento E821 nel 2001 presso BNL, con un valore misurato di a_mu = 11 659 208.0(6.3)x10^-10 e una precisione complessiva di 0.54 ppm, ci ha lasciati con una dif

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28

Wienands, Joshua Nikolai. "Coils, fields and xenon : towards measuring xenon spin precession in a magnetic field for the UCN collaboration." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59080.

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In this thesis I present my work on building a set of magnetic coils for the purpose of performing nuclear magnetic resonance (NMR) on Boltzmann polarized protons in water, and on hyperpolarized ¹²⁹Xe. The coils were designed to be used as a method for testing the degree of polarization achieved in ¹²⁹Xe, and for testing the capability of an in-house developed continuous wave (CW) ultraviolet (UV) laser to drive a 2-photon transition in ¹²⁹Xe. This laser will be used to measure the precession frequency of ¹²⁹Xe in a magnetic field, in order to precisely measure the magnitude of that field. Thi

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29

Schneider, Gerald Manfred. "Structures and turbulence characteristics in a precessing jet flow /." Title page, contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phs358.pdf.

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30

Slawig, Anne [Verfasser], and Herbert [Gutachter] Köstler. "Reconstruction methods for the frequency-modulated balanced steady-state free precession MRI-sequence / Anne Slawig ; Gutachter: Herbert Köstler." Würzburg : Universität Würzburg, 2018. http://d-nb.info/1161344284/34.

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31

Shimada, Kotaro. "Non-contrast-enhanced Hepatic MR Angiography with True Steady-state Free-precession and Time Spatial Labeling Inversion Pulse." Kyoto University, 2011. http://hdl.handle.net/2433/142053.

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32

Mantsis, Damianos F. "Atmospheric Response to Orbital Forcing and 20th Century Sea Surface Temperatures." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_dissertations/597.

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This study investigates modes of atmospheric variability in response to changes in Earth's orbit and changes in 20th century sea surface temperatures (SST). The orbital forcing is manifested by a change in obliquity and precession, and changes the distribution of the top-of-atmosphere insolation. A smaller obliquity reduces the the annual insolation that the poles receive and increases the annual insolation in the tropics. As the meridional insolation gradient increases, the zonal mean atmospheric-ocean circulation increases. The resulting climate also has a reduced global mean temperature due

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Freitag, Sonja-Marie [Verfasser], and Dirk [Akademischer Betreuer] Blondin. "Kontrastmittelfreie balanced Steady-State Free Precession 3D-MR-Angiographie an Nieren- und Nierentransplantatarterien / Sonja-Marie Freitag. Gutachter: Dirk Blondin." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2012. http://d-nb.info/1029350167/34.

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34

Gao, Ying Gao. "Development of Quantitative Fast Imaging with Steady-State Free Precession (FISP) Techniques for High Field Preclinical Magnetic Resonance Imaging." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1475150834919997.

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35

Maurer, Andrew Porter. "Contributions of self-motion information and theta phase precession to the spatial metric of the dorsal and middle hippocampus." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/193990.

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This dissertation explores the relationships between self-motion, place field size, and theta phase precession with a primary focus on providing insight into the interactions between theta phase precession and place field size. The present data indicate that place field size increases along the dorsal to ventral axis of the hippocampus. Pyramidal neurons of the middle hippocampus, with larger place fields, exhibit a lower intrinsic burst frequency compared to dorsal place cells. Moreover, the firing rate of neurons in the middle hippocampus show a weaker relationship with running velocity comp

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36

Huxter, John Richard. "Theta phase precession and the temporal representation of space : environmental and behavioural contributions to place cell firing in the rat." Thesis, University College London (University of London), 2004. http://discovery.ucl.ac.uk/1446611/.

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Place cells" fire when a rat enters a particular region of the environment - a rate code for space. As the rat traverses the "place field", the place cell fires earlier in each successive cycle of the theta EEG oscillation - a temporal code, known as "phase precession". Simultaneous recordings were made of place cell action potentials and the local EEG in rats shuttling between the ends of a stationary treadmill for food reward. Probe trials involved 1) changing the height of the walls bounding the ends of the treadmill, 2) compressing the treadmill by bringing the end walls together, and 3) c

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Zhao, Peng. "A STUDY OF SURFACE ACOUSTIC WAVE AND SPIN PRECESSION USING AN ULTRAFAST LASER FOR LOCALIZED ELASTIC AND MAGNETIC PROPERTY MEASUREMENT." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1367591435.

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38

SASSIER, ERIC. "Magnetometres a precession libre de noyaux d'3he et a jonction josephson. Contribution a la realisation d'une reference de champ magnetique." Caen, 2000. http://www.theses.fr/2000CAEN2033.

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L'etalonnage de magnetometres absolus a l'aide d'un banc de calibration fonctionnant dans le champ terrestre suppose l'utilisation de magnetometres de reference. La sonde a 3he developpee au ciril exploite la precession libre du noyau de cet atome, et en fournit une fiable pour les champs de l'ordre de grandeur du champ terrestre. Les magnetometres josephson fraunhofer meissner (jfm) a haute temperature critique (htc) sont susceptibles d'en fournir une pour les champ faibles. Les deux premieres parties de ce memoire sont chacune consacree a l'un de ces capteurs, dont nous etudions d'abord la r

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Lorenzani, Silvia. "Fluid instabilities in precessing ellipsoidal shells." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964398702.

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Accioly, Artur Difini. "Estudo do efeito de transferência de spin." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2011. http://hdl.handle.net/10183/29508.

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A ideia de transferência de spin, como forma de controle da magnetização, foi introduzida independentemente por Slonczewski e por Berger em 1996. Desde então, esse efeito tem sido alvo de inúmeras pesquisas, em especial pela possibilidade de aplicações em memorias magnéticas não voláteis e em osciladores de alta frequência. Devido _a complexidade do problema, a grande maioria das pesquisas teóricas sobre o assunto _e baseada em resultados numéricos. Porém, esses métodos podem dificultar a visualização das influências individuais dos diferentes termos envolvidos. Para isso, seria melhor a utili

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Casula, V. (Victor). "Quantitative magnetic resonance imaging methods for evaluation of articular cartilage in knee osteoarthritis:free-precession and rotating-frame relaxation studies at 3 Tesla." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526213521.

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Abstract Osteoarthritis (OA) is a common chronic condition that reduces the quality of life of millions of individuals worldwilde. In OA, the progressive degradation of articular cartilage (AC) and bone can cause joint pain and disability. Currently there is no effective treatment available for OA besides gross joint replacement surgery. This is largely due to the lack of accurate biomarkers to test potential drugs and treatments that could stop or reverse the disease progression. The primary tools in use for OA diagnostics are inadequate in the early stage of the disease and merely allow its

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Millot, Yannick. "Nouvelles applications des noyaux quadrupolaires en rmn : - gradient de champ electrique dans la zeolithe y ; - dynamique des spins : precession, nutation et rotation." Paris 6, 2001. http://www.theses.fr/2001PA066168.

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Cette these a pour objet l'etude de nouvelles applications des noyaux quadrupolaires en rmn. Nous avons quantifie le gradient de champ electrique (gce) dans la zeolithe y avec trois methodes. Deux d'entre elles utilisent le 1 3 1xe, celui-ci etant affecte par le ringing de la sonde, nous avons cherche une sequence d'impulsions capable de l'eliminer. Ces methodes ont ete appliquees sur des zeolithes y desaluminees avec vapeur d'eau, ainsi qu'aux zeolithes echangees aux lanthanes. La premiere methode se fonde sur la difference des deplacements chimiques du 1 3 1xe et du 1 2 9xe, cette difference

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Huo, Changming. "A Bloch Sphere Animation Software using a Three Dimensional Java Simulator." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1249917839.

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Mirijanian, James Julian. "Techniques to Characterize Vapor Cell Performance for a Nuclear-Magnetic-Resonance Gyroscope." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/724.

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Research was performed to improve the procedures for testing performance parameters of vapor cells for a nuclear-magnetic-resonance gyroscope. In addition to summarizing the theoretical infrastructure of the technology, this research resulted in the development and successful implementation of new techniques to characterize gyro cell performance. One of the most important parameters to measure for gyro performance is the longitudinal spin lifetime of polarized xenon atoms in the vapor cell. The newly implemented technique for measuring these lifetimes matches results from the industry standard

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Kienzle, Melina [Verfasser]. "Darstellung und Quantifizierung der Myelonbewegung mittels MRT unter Einsatz von cine true fast imaging with steady-state Precession-Sequenzen und Phasenkontrast / Melina Kienzle." Ulm : Universität Ulm. Medizinische Fakultät, 2012. http://d-nb.info/1019563362/34.

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Silva, Marcos Vinícius Ferreira da. "Subgrupos do grupo de Lorentz e simetria de matéria escura /." Guaratinguetá, 2020. http://hdl.handle.net/11449/192491.

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Orientador: Julio Marny Hoff da Silva<br>Resumo: Teorias que violam as simetrias de Lorentz são de certa forma comumente encontradas na literatura. Com o estudo dos subgrupos do grupo de Lorentz, uma pergunta fica no ar. Será preciso todo o grupo de Lorentz para descrever as simetrias do espaço-tempo ou apenas um subgrupo já seria suficiente? Se isso for possível teríamos um teoria que violaria as simetrias de Lorentz e consequentemente outras peguntas surgem. Essa teoria serve para descrever a matéria bariônica ou outro tipo de matéria? Neste trabalho usaremos os grupos da very special relati

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Kawahara, Seiya. "Non-contrast-enhanced hepatic MR arteriography with balanced steady-state free-precession and time spatial labeling inversion pulse: optimization of the inversion time at 3 Tesla." Kyoto University, 2017. http://hdl.handle.net/2433/228217.

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Frye, Christopher. "Modification to Einstein's field equations imposed by string theory and consequences for the classical tests of general relativity." Honors in the Major Thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/852.

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Abstract:

String theory imposes slight modifications to Einstein's equations of general relativity (GR). In (4), the authors claim that the gravitational field equations in empty space, which in GR are just R [subscript greek letters mu nu ] = 0, should hold one extra term which is first order in the string constant [alpha'] and proportional to the Riemann curvature tensor squared. They do admit, however, that this simple modification is just schematic. In (1) the authors use modified equations which are coupled to the dilation field. We show that equations given in (4) do not admit an isotropic solutio

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Satogami, Naoe. "Visualization of external carotid artery and its branches: Non-contrast-enhanced MR angiography using balanced steady-state free-precession sequence and a time-spatial labeling inversion pulse." Kyoto University, 2011. http://hdl.handle.net/2433/142043.

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Vidal, Jérémie. "Orbital forcings of a fluid ellipsoid. Inertial instabilities and dynamos." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAU004/document.

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Les instabilités inertielles sont des instabilités fluides excitées au sein de modèles physiques simplifiés de planètes ou d'étoiles. Elles peuvent générer un champ magnétique dynamo. Ce sont donc des alternatives aux écoulements forcés par la convection thermo-chimique pour générer les champs magnétiques dans les noyaux liquides des planètes et les enveloppes fluides des étoiles. Cependant, ces modèles simplifiés questionnent la pertinence des résultats, qui sont ensuite extrapolés aux contextes géo- et astrophysique. D'un point de vue fondamental, de récentes études numériques et expérimenta

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