Dissertations / Theses on the topic 'The origin of magnetic field'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'The origin of magnetic field.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Schwarte, Judith. "Modelling the earth's magnetic field of magnetospheric origin from CHAMP data." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971057001.
Full textXu, Hao. "The AGN origin of cluster magnetic fields." Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3356297.
Full textTitle from first page of PDF file (viewed July 7, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 132-139).
Barnes, D. J. "Origin and evolution of large-scale magnetic fields." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1466179/.
Full textWilmot-Smith, Antonia. "The origin and dynamic interaction of solar magnetic fields." Thesis, St Andrews, 2008. http://hdl.handle.net/10023/417.
Full textBeck, Alexander Maximilian. "On the origin and growth of cosmic magnetic fields." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-164179.
Full textSchwarte, Judith [Verfasser]. "Modelling the earth's magnetic field of magnetospheric origin from CHAMP data / Geoforschungszentrum Potsdam. Von Judith Schwarte." Potsdam : Geoforschungszentrum, 2004. http://d-nb.info/971057001/34.
Full textPariev, Vladimir Ivanovich. "Magnetic fields: Their origin and manifestation in accretion disks around supermassive black holes." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279820.
Full textAoyama, Tadashi. "A study on the origin of small-scale field-aligned currents as observed in topside ionosphere at middle and low latitudes." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225408.
Full textBeck, Alexander Maximilian [Verfasser], and Harald [Akademischer Betreuer] Lesch. "On the origin and growth of cosmic magnetic fields / Alexander Maximilian Beck. Betreuer: Harald Lesch." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1046503154/34.
Full textBertin, Alexandre. "Geometrical frustration and quantum origin of spin dynamics." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENY014/document.
Full textThis Phd thesis focuses on the study of magnetically frustrated compounds where magnetic ions lie at the vertices of a corner-sharing tetrahedra network: the pyrochlore compounds. The two series of chemical formula R2M2O7, where R is a lanthanide and M=Ti, Sn, are of peculiar interest since they display a large variety of exotic magnetic ground states. First, we have studied the crystal-electric-field acting at the rare earth within the Stevens approximation where only the ground state multiplet is considered. A single set of parameters for each families of interest has been determined through a global analysis including several inelastic neutron scattering spectra of various compounds. Then, we have characterised with a large panel of techniques the low temperature physical properties of Nd2Sn2O7. This compound enters a long-range magnetic order at transition temperature Tc=0.91 K with an ``all-in-all-out'' spin configuration. A persistence of spin dynamics has been found in the ordered phase, ascribed to one-dimensional spin loops excitations. Anomalously slow paramagnetic spin fluctuations are also reported. Finally, we have brought information on the two proposed ground states of the widely studied compound Tb2Ti2O7: first, a Jahn-Teller transition is claimed to occur at low temperatures but no broadening of the Bragg peaks is seen down to T=4 K precluding premises of a structural transition. Secondly, this compound could be a realisation of a quantum spin-ice but no definitive evidence of a magnetisation plateau is found down to T=20 mK
Darah, Alhashmi A. "Magnetic field generation within an ambient magnetic field." Thesis, University of Newcastle Upon Tyne, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505835.
Full textPotter, D. K. "Magnetic remanences of gyromagnetic origin in rocks and other magnetic materials." Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372568.
Full textSatter, Md Abdus. "A theory for dilute magnetic alloys : the origin of magnetic anisotropy." Thesis, University of Warwick, 1989. http://wrap.warwick.ac.uk/101517/.
Full textPetropoulos, Labros Spiridon. "Magnetic field issues in magnetic resonance imaging." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1060710667.
Full textBrett, Belinda Jane. "The galactic magnetic field." Thesis, University of Plymouth, 1986. http://hdl.handle.net/10026.1/1696.
Full textOstroumov, Ivan Victorovich. "Investigation of magnetic field." Thesis, Polit. Challenges of science today: XIV International Scientific and Practical Conference of Young Researchers and Students, April 2–3, 2014 : theses. – К., 2014. – 34p, 2014. http://er.nau.edu.ua/handle/NAU/26583.
Full textGunther, Janelle. "Defects in liquid crystal polymers : their origins and behavior in magnetic and flow fields." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43466.
Full textZhang, Qi. "Magnetic Rendering: Magnetic Field Control for Haptic Interaction." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32613.
Full textBeck, Paul Beck Paul. "Magnetic field assisted biomaterials processing /." [S.l.] : [s.n.], 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18292.
Full textGlover, Paul Martin. "High field magnetic resonance imaging." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335575.
Full textBingaman, Adam Neal. "Tilt-Compensated Magnetic Field Sensor." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33295.
Full textThe purpose of this document is to describe the development, construction, and testing of a tilt-stabilized three-axis magnetic field sensor. The sensor is implemented as a three-axis general-purpose magnetic field sensor, with the additional capability of being implemented as a compass. Design and construction of system hardware is discussed, along with software development and implementation.
Finite impulse response filters are designed and implemented in hardware to filter the acquired magnetic signals. Various designs of median filters are simulated and tested for smoothing inclination signal irregularities and noise. Trigonometric conversions necessary for tilt-compensation are calculated in software using traditional methods, as well as the Coordinate Rotation Digital Computer (CORDIC) algorithm. Both calculation methods are compared for execution time and efficiency.
Successful incorporation of all design aspects leads to detection and output of stable earth magnetic fields, sinusoidal signals, and aperiodic signatures while the magnetometer system is subject to significant tilt motion. Optimized system execution time leads to a maximum detectable signal bandwidth of 410 Hz. Integration of azimuth angle calculation is incorporated and is successfully tested with minimal error, allowing the system to be used as a compass.
Results of the compensated system tests are compared to non-compensated results to display system performance, including tilt-compensation effectiveness, noise attenuation, and operational speed.
Master of Science
Goodluck, Olufemi W. (Olufemi Waheed). "Magnetic separation of strongly magnetic particles using alternating field." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65920.
Full textMiao, Jingqi. "The theory of magnetic polarons and magnetic field effect in diluted magnetic semiconductors." Thesis, University of Hull, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264955.
Full textArpinar, Volkan Emre. "Analysis Of Magnetic Resonance Imaging In Inhomogenous Main Magnetic Field." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611008/index.pdf.
Full textLuck, Stanley David. "The role of magnetic field gradients in nuclear magnetic resonance." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/27541.
Full textScience, Faculty of
Chemistry, Department of
Graduate
Lukawska, Anna Beata. "THERMAL PROPERTIES OF MAGNETIC NANOPARTICLES IN EXTERNAL AC MAGNETIC FIELD." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1401441820.
Full textWatterson, P. A. "Force-free magnetic field evolution in the reversed-field pinch." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355048.
Full textCarter, John P. "Magnetic field generation in shock waves." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://edocs.nps.edu/npspubs/scholarly/theses/1994/June/94Jun_Carter.pdf.
Full textVirtanen, I. (. Ilpo). "Asymmetry of the heliospheric magnetic field." Doctoral thesis, University of Oulu, 2013. http://urn.fi/urn:isbn:9789526202563.
Full textBrada, Matej. "Graphene electronic devices in magnetic field." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21800.
Full textPointer, Graham Richard. "The magnetic field of AB Doradûs." Thesis, University of St Andrews, 2001. http://hdl.handle.net/10023/12940.
Full textOlander, Terese. "The magnetic field of ε Eri." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-201519.
Full textLeichle, Thierry C. "A micromachined resonant magnetic field sensor." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/13833.
Full textRobinson, Alexander Joseph. "Magnetic field effects on biological systems." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543006.
Full textPulecio, Javier F. "Field-Coupled Nano-Magnetic Logic Systems." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3608.
Full textHerreros, Quentin. "Very low field magnetic resonance imaging." Phd thesis, Université René Descartes - Paris V, 2013. http://tel.archives-ouvertes.fr/tel-01064053.
Full textRodgers, Christopher T. "Magnetic field effects in chemical systems." Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:f5878b88-c5ba-4cbd-83af-857431aef66e.
Full textFenton, Neil David. "Optical and magnetic ligand-field studies." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317773.
Full textSulaiman, Ali Haidar. "The near-Saturn magnetic field environment." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/44209.
Full textAigner, Simon. "Magnetic field microscopy using ultracold atoms." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:16-opus-79425.
Full textTakeo, Hiroshi. "Copper electrodeposition in a magnetic field." PDXScholar, 1985. https://pdxscholar.library.pdx.edu/open_access_etds/3550.
Full textTucker, Philip John Yorke. "Magnetic instability, magnetoconvection and magnetic field generation in a plane layer." Thesis, University of Exeter, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263204.
Full textNg, Bryan. "Understanding magnetic field reversal mechanisms in mesoscopic magnetic multilayer ring structures." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45395.
Full textIncludes bibliographical references.
Patterned pseudo spin-valve rings show great promise for device applications due to their non-volatility and variety of stable magnetic states. However, the magnetic reversal of these elements under an applied field is complex due to the magnetostatic coupling between the two ferromagnetic layers. Elliptical rings are electrically probed using highly symmetric Wheatstone bridges in conjunction with traditional four-point electrical measurements and micromagnetic simulations. New insight into domain wall nucleation and propagation events are elucidated. The resulting behavior is found to yield large signals at very low fields, making these devices ideal for device applications in data storage and computer logic. 360° domain walls are found to be extremely stable until fields as high as 10000e, but are positionally uncontrollable in elliptical rings. Rhombic rings were investigated as a geometry that can nucleate, propagate and pin domain walls more easily. Measurements and simulations confirm that the same reversal mechanisms exist and domain walls are more systematically positioned. The control over 3600 domain walls is valuable since reversals can occur without nucleation by decoupling the wall into a reverse domain. As a result, rhombic rings are useful as devices that can perform device functions at extremely low fields.
by Bryan Ng.
M.Eng.
Rinkevich, A. B., M. I. Samoylovich, and A. F. Belyanin. "Effective Conductivity and Magnetic Permeability of Nanostructured Materials in Magnetic Field." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35340.
Full textSipilä, Pekka [Verfasser]. "Real-Time Magnetic Field Monitoring in Magnetic Resonance Imaging / Pekka Sipilä." Aachen : Shaker, 2011. http://d-nb.info/1069050512/34.
Full textIgnace, R., and K. G. Gayley. "Circumstellar Magnetic Field Diagnostics from Line Polarization." Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1806/.
Full textMaguire, Steven. "Magnetic field control of silver nanoparticle formation." Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27390.
Full textUnger, Philip Peter. "NMR-based microprobes for magnetic field measurements." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ62675.pdf.
Full textUno, Hideharu. "New constraints on Mercury's internal magnetic field." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/7716.
Full textZhu, Weiwei. "The cooling of high-magnetic-field pulsars." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104725.
Full textDans le chapitre 3, je présente mon travail sur la lueur résiduelle de AXP 1E2259+586. Il s'agit du premier pulsar anormal à partir duquel des pulsations similaires à celles des SGR ont été détectées. Ce pulsar a eu un sursaut énergétique majeur en 2002. Nous avons étudié la lueur résiduelle de ce sursaut au travers 10 observations faites avec le télescope XMM prises avant et après le sursaut. Nous avons trouvé que le flux du pulsar a diminué en suivant une fonction de puissance dont l'indice, −0.69±0.03, est remarquablement similaire à celui trouvé dans le rayonnement résiduel des sursauts des SGR. Nous avons aussi trouvé une corrélation entrela dureté du spectre et le flux en rayons-X, une corrélation qui est aussi observée dans d'autres AXP. Dans le chapitre 4, je présente mon travail sur la recherche de variations dans la luminosité-X de AXP 1E 1841−045. Ce pulsar est parmi les AXP qui présentent le plus fréquemment des sauts de fréquences, ou glitchs. Plusieurs théories des magnétars suggèrent une connection entre les glitchs et la variation de la luminosité-X. Malgré celà, nous n'avons pas trouvé de preuve de l'éxistence de ces variations dans la luminosité-X de 1E 1841−045 dans des observations prises entre 1993 et 2006 avec des télescopes variés. Ceci démontre l'existence de glitchs silencieux. Il est intéressant de noter qu'il existe un groupe de pulsars normaux, dont la source de luminosité est leur énergie rotationelle, qui ont un champ magnétique élevé et proche de celui des magnétars ( 1013 G). Certaines caractéristiques de ces pulsars à champ magnétique élevé sont similaires à celles des magnétars. Dans le chapitre 5, je présente la première détection en rayons-X du pulsar à champs magnétique élevé B1916+14. Nous avons trouvé que le spectre d'émission de ce pulsar est probablement thermique, avec une température de surface entre 0.08–0.23 keV. Nous n'avons pas détecté de pulsations régulières dans les données, avec une limite supérieure (1)de 0.7 sur la fraction pulsée entre 0.1 et 2 keV. Il est aussi difficile de déterminer si le spectre d'émission thermique observé est dû à un refroidissement initial ou à un courant qui réchauffe la surface du pulsar en ce moment. C'est pourquoi plus d'observations sont requises afin de prouver que le réchauffement de la surface est dû à une diminution du champ magnétique. Dans le chapitre 6, je présente mon travail effectué sur des observations faites avec le télescope Chandra du pulsar a champ magnétique élevé RPP J1718−3718. Nous avons détecté des pulsations régulières en rayons-X à un interval égal à celui de la fréquence rotationelle de ce pulsar et avec une fraction pulsée de 52%±13% entre 0.8 et 2 keV. Nous avons trouvé, en étudiant le spectre combiné de plusieurs observations,une température de corps noir de 0.19±0.02 keV. C'est une température un peu plus élevée que celle prédite par les modèles standards de refroidissement. Par contre, les modèles numériques d'atmosphère des étoiles à neutrons est en accord avec les modèles standards de refroidissement. Nous avons aussi trouvé que la luminosité bolométrique représente 0.3 de la puissance due à la perte d'énergie rotationelle, si l'on suppose une distance de 4.5 kpc. Finalement, nous avons comparé les températures de corps noirs des pulsars normaux à champ magnétique élevé avec ceux de pulsars normaux du même âge ayant un champ magnétique faible, et nous avons trouvé que les premiers avaient des températures plus élevées, comme le prédisent les modèles magnéto-thermiques ayant comme but d'unifier les pulsars normaux à champs magnétiques élevés et les magnétars.