Дисертації з теми "Condensed matter imaging"
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Bhandari, Sagar. "Imaging Electron Flow in Graphene." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467347.
Повний текст джерелаEngineering and Applied Sciences - Applied Physics
Xu, Peng. "Infrared Spectroscopy and Nano-Imaging of La0.67Sr0.33Mno3 Films." W&M ScholarWorks, 2017. https://scholarworks.wm.edu/etd/1516639666.
Повний текст джерелаHummert, Stephanie Maria. "Magneto-Optical Imaging of Superconducting MgB2 Thin Films." W&M ScholarWorks, 2007. https://scholarworks.wm.edu/etd/1539626854.
Повний текст джерелаFrey, Alexander. "Time-Resolved Magneto-Optical Imaging of Superconducting YBCO Thin Films in the High-Frequency AC Current Regime." W&M ScholarWorks, 2006. https://scholarworks.wm.edu/etd/1539626846.
Повний текст джерелаWaissman, Jonah. "Carbon Nanotubes for the Generation and Imaging of Interacting 1D States of Matter." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11661.
Повний текст джерелаEngineering and Applied Sciences
Senning, Eric Nicolas 1978. "Mitochondrial dynamics and optical conformation changes in DsRed as studied by fourier imaging correlation spectroscopy." Thesis, University of Oregon, 2009. http://hdl.handle.net/1794/10337.
Повний текст джерелаNovel experiments that probe the dynamics of intracellular species, including the center-of-mass displacements and internal conformational transitions of biological macromolecules, have the potential to reveal the complex biochemical mechanisms operating within the cell. This work presents the implementation and development of Fourier imaging correlation spectroscopy (FICS), a phase-selective approach to fluorescence spectroscopy that measures the collective coordinate fluctuations of fluorescently labeled microscopic particles. In FICS experiments, a spatially modulated optical grating excites a fluorescently labeled sample. Phase-synchronous detection of the fluorescence, with respect to the phase of the exciting optical grating, can be used to monitor the fluctuations of partially averaged spatial coordinates. These data are then analyzed by two-point and four-point time correlation functions to provide a statistically meaningful understanding of the dynamics under observation. FICS represents a unique route to elevate signal levels, while acquiring detailed information about molecular coordinate trajectories. Mitochondria of mammalian cells are known to associate with cytoskeletal proteins, and their motions are affected by the stability of microtubules and microfilaments. Within the cell it is possible to fluorescently label the mitochondria and study its dynamic behavior with FICS. The dynamics of S. cerevisiae yeast mitochondria are characterized at four discrete length scales (ranging from 0.6 - 1.19 μm) and provide detailed information about the influence of specific cytoskeletal elements. Using the microtubule and microfilament destabilizing agents, Nocodazole and Latrunculin A, it is determined that microfilaments are required for normal yeast mitochondrial motion while microtubules have no effect. Experiments with specific actin mutants revealed that actin is responsible for enhanced mobility on length scales greater than 0.6 μm. The versatility of FICS expands when individual molecules are labeled with fluorescent chromophores. In recent experiments on the tetrameric fluorescent protein DsRed, polarization-modulated FICS (PM-FICS) is demonstrated to separate conformational dynamics from molecular translational dynamics. The optical switching pathways of DsRed, a tetrameric complex of fluorescent protein subunits, are examined. An analysis of PM-FICS coordinate trajectories, in terms of 2D spectra and joint probability distributions, provides detailed information about the transition pathways between distinct dipole-coupled DsRed conformations. This dissertation includes co-authored and previously published material.
Committee in charge: Tom Stevens, Chairperson, Chemistry; Andrew Marcus, Advisor, Chemistry; Peter von Hippel, Member, Chemistry; Marina Guenza, Member, Chemistry; John Toner, Outside Member, Physics
Hong, Sungkun. "Nanoscale Magnetic Imaging with a Single Nitrogen-Vacancy Center in Diamond." Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10671.
Повний текст джерелаEngineering and Applied Sciences
GURUNG, TAK BAHADUR. "OPTICAL IMAGING OF EXCITON MAGNETIC POLARONS IN DILUTED MAGNETIC SEMICONDUCTOR QUANTUM DOTS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1155658535.
Повний текст джерелаYang, Weibing. "Probing electronic, magnetic and structural heterogeneity in advanced materials and Nanostructures with x-ray imaging, scattering and spectroscopic techniques." Diss., Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/588064.
Повний текст джерелаPh.D.
In this dissertation, we have used a combination of synchrotron-based x-ray spectroscopic, scattering and imaging techniques to investigate the electronic, magnetic and structural properties of materials and material systems which exhibit natural as well as engineered nanoscale structural distortions. In order to investigate the interplay between the above-mentioned degrees of freedom with spatial and depth resolution, we have utilized non-destructive techniques, such as x-ray absorption spectroscopy (XAS), polarization-dependent photoemission electron microscopy (PEEM), nanoscale scanning x-ray diffraction microscopy (nano-SXDM) and standing-wave x-ray photoemission spectroscopy (SW-XPS). The results were compared to several types of state-of-the-art first-principles theoretical calculations. In the first part of the dissertation, we have investigated the nanoscale magneto-elastic structure of the Fe3Ga magnetic alloy, which was recently reported to exhibit non-volume conserving magnetostriction. As the result of our combined PEEM and nano-SXDM study, we have discovered the structural basis for this phenomenon – periodic long-wavelength (~269 nm) elastic domain walls, with domains (regions of zero-strain) existing as narrow transition regions. Atto-scale elastic gradients and self-strain across the elastic domain walls were quantitatively measured and imaged by nano-SXDM. Our measurements revealed that the gradients inside the elastic walls are accommodated by gradually increasing/decreasing inter-planar spacing resembling a longitudinal wave. Our element-specific polarization-dependent PEEM measurements revealed that the magnetic structure of the crystal modulates with similar periodicity (~255 nm), and the resulting magneto-elastic coupling produces a ‘giant’ field-induced bulk deformation, which is equal to the measured self-strain of the elastic domain wall. In the second part of this dissertation, we utilized a combination of soft x-ray standing-wave photoemission spectroscopy (SW-XPS), hard x-ray photoemission spectroscopy (HAXPES) and scanning transmission electron microscopy (STEM) to probe the depth-dependent and single-unit-cell resolved electronic structure of isovalent manganite superlattices (Eu0.7Sr0.3MnO3/La0.7Sr0.3MnO3)15 wherein the electronic and magnetic properties are intentionally modulated with depth via engineered O octahedral rotations and A-site displacements. Standing-wave-excited spectroscopy of the Mn 2p and O 1s core-levels confirmed the isovalent nature of the Mn ions in the superlattice and revealed significant depth-dependent variations in the local chemical and electronic environment around the O atoms, consistent with the state-of-the-art theoretical calculations. Furthermore, it was shown that a surface relaxation and orbital reconstruction in the several top Eu0.7Sr0.3MnO3 atomic layers produces substantial changes in the observed electronic structure, which, according to the first-principles theoretical calculations, occur due to the establishment of orbital stripe order in the top unit cell. In summary, we have used synchrotron-based x-ray spectroscopic and microscopic techniques, in conjunction with high-resolution electron microscopy, to study the electronic, magnetic and structural properties of advanced functional materials exhibiting strong nanoscale heterogeneity. We discovered a strong coupling between the nanoscale structural and magnetic properties in the non-conventional magnetostrictive Fe3Ga single crystal. Our results suggest that this coupling provides the fundamental basis for the non-conventional magnetostriction phenomenon in this material. We have also discovered that the electronic properties of the Eu0.7Sr0.3MnO3/La0.7Sr0.3MnO3 superlattices can be epitaxially tuned via engineered A-site cation displacement, which is a result of the strong interfacial coupling between the Eu0.7Sr0.3MnO3 and La0.7Sr0.3MnO3 layers. This suggests a new way of tailoring and spatially-confining electronic and ferroic behavior in complex oxide heterostructures and creating novel ordered surface-reconstruction effects.
Temple University--Theses
Pendery, Joel S. "Nanoscale Patterning and Imaging of Liquid Crystals and Colloids at Surfaces." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1396623443.
Повний текст джерелаWolfe, Christopher Stuart. "Novel Techniques for Detection and Imaging of Spin Related Phenomena: Towards Sub-Diffraction Limited Resolution." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437316315.
Повний текст джерелаBhallamudi, Vidya Praveen. "Spins in heterogeneous landscapes: Consequences for transport and imaging." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306871981.
Повний текст джерелаIqbal, Mohammad. "Polarization stereoscopic imaging prototype." Phd thesis, Université de Bourgogne, 2011. http://tel.archives-ouvertes.fr/tel-00702271.
Повний текст джерелаBascoul, Guillaume. "Applications de la cartographie en émission de lumière dynamique (Time Resolved Imaging) pour l'analyse de défaillance des composants VLSI." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00880532.
Повний текст джерелаHerreros, Quentin. "Very low field magnetic resonance imaging." Phd thesis, Université René Descartes - Paris V, 2013. http://tel.archives-ouvertes.fr/tel-01064053.
Повний текст джерелаLatt, Kyaw Zin. "Manipulation of Molecular Charge Density Waves and Molecular Transport Systems." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1557418915977344.
Повний текст джерелаTeeling-Smith, Richelle Marie. "Single Molecule Electron Paramagnetic Resonance and Other Sensing and Imaging Applications with Nitrogen-Vacancy Nanodiamond." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1424779811.
Повний текст джерелаSchoeffel, Markus. "Nanoparticules multifonctionnelles de vanadate dopées aux terres rares : Marqueurs luminescents, détecteurs d'oxydant et agent de contraste pour l'imagerie à résonance magnétique." Phd thesis, Ecole Polytechnique X, 2012. http://pastel.archives-ouvertes.fr/pastel-00688113.
Повний текст джерелаRyan, Christopher James. "Three Dimensional Data Storage in Polymeric Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1327696439.
Повний текст джерелаThompson, James Russell. "Imaging the assembly of the Staphylococcal pore-forming toxin alpha-Hemolysin." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:e320004a-6118-4dac-af2a-eca6e90be7ac.
Повний текст джерелаZhu, Sha. "A Bayesian Approach for Inverse Problems in Synthetic Aperture Radar Imaging." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00844748.
Повний текст джерелаRichard, Marie-Hélène. "Design study of a Compton camera for prompts-gamma imaging during ion beam therapy." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00934715.
Повний текст джерелаMcCormick, Elizabeth Joan McCormick. "Optical Properties of Two Dimensional Semiconductors." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531907387651019.
Повний текст джерелаCaldas, de Almeida Araujo Ericky. "Adaptation of Proof of Concepts Into Quantitative NMR Methods : Clinical Application for the Characterization of Alterations Observed in the Skeletal Muscle Tissue in Neuromuscular Disorders." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01067940.
Повний текст джерелаZhang, Ting. "Electromagnetic wave imaging of targets buried in a cluttered medium using an hybrid Inversion-DORT method." Phd thesis, Ecole centrale de Marseille, 2014. http://tel.archives-ouvertes.fr/tel-01037906.
Повний текст джерелаGuevara, Alvez Pamela Beatriz. "Inference of a human brain fiber bundle atlas from high angular resolution diffusion imaging." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00638766.
Повний текст джерелаAnna, Guillaume. "Optimisation du contraste dans les images polarimétriques : étude théorique, algorithmes et validation expérimentale." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00874686.
Повний текст джерелаYgouf, Marie. "Nouvelle méthode de traitement d'images multispectrales fondée sur un modèle d'instrument pour la haut contraste : application à la détection d'exoplanètes." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00843202.
Повний текст джерелаMarinescu, Marilena Ioana. "Multimodal characterization of superparamagnetic particles of iron oxide for inflammation imaging : application to experimental cerebral ischemia." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00994167.
Повний текст джерелаSeifi, Mozhdeh. "Signal processing methods for fast and accurate reconstruction of digital holograms." Phd thesis, Université Jean Monnet - Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-01004605.
Повний текст джерелаFiole, Daniel. "Apports de la microscopie biphotonique intravitale pulmonaire à l'étude de la physiopathologie de la maladie du charbon." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00952722.
Повний текст джерелаJung, Young Woo. "Optical studies and biological applications of spins in semiconductors." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306523724.
Повний текст джерелаCloos, Martijn Anton Hendrik. "Parallel transmission for magnetic resonance imaging of the human brain at ultra high field : specific absorption rate control & flip-angle homogenization." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00732658.
Повний текст джерелаRizzi, Julien. "Imagerie de phase quantitative par interférométrie à décalage quadri-latéral. Application au domaine des rayons x durs." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00917590.
Повний текст джерелаHopchev, Plamen. "Mesures de la luminosité absolue à l'expérience LHCb." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00684982.
Повний текст джерелаKosior, Ewelina. "Combinaison de la microscopie de fluorescence X et de l'imagerie X par contraste de phase pour l'imagerie clinique sub-cellulaire." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00952355.
Повний текст джерелаZurek, Magdalena. "IRM des poumons à temps d'écho courts : méthodes et applications à des modèles expérimentaux chez le rongeur." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00808506.
Повний текст джерелаHudin, Nicolas. "Développement de nouvelles sondes per-opératoires positon pour guider la chirurgie des tumeurs solides." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00906756.
Повний текст джерелаPosavec, Tony. "An Investigation into the Fluorescence of Polymers." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1499353221343727.
Повний текст джерелаAlves, Cássio. "Propriedades dinâmicas de fases condensadas de DNA." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-20122010-220157/.
Повний текст джерелаPreparation of synthetic vectors for gene therapy applications implies encapsulation of DNA in small cavities in high concentrations and in these conditions DNA molecules self-organize forming liquid crystalline structures. Once incorporated to the cell, DNA must diuse in cytoplasm and many experimental work have demonstrated that such diusion is limited by the fragments size. In this context, DNA solutions can be regarded as a promising model system for investigating isotropic and anisotropic diusion. In this work we have investigated diusion of DNA fragments, (150 base pairs), dissolved in water, for concentrations varying from 80 mg/ml to 350 mg/ml, ranging the domains of isotropic and cholesteric phases, with an intermediary region of phase coexistence. Salt was added to the solution, in concentration high enough to screen repulsive electrostatic interactions allowing us to regard DNA fragments as non interacting rigid rods. FRAP (Fluorescence Recovery After Photobleach) technique was used to determine diusion coecients of DNA fragments marked with a uorescent probe, which binds covalently to the nucleotides. Analysis of FRAP images are performed following two possible ttings to the intensity prole in bleach zone, which can be a Gaussian function, for isotropic diusion, either a Bessel modied function if the diusion process is anisotropic. In the isotropic phase the Gaussian function was found to be more appropriate to describe the intensity prole in the bleach spot zone, resulting in a diusion coecient around 20 m2=s, which is compatible with values reported in literature for DNA solutions of fragments of the same dimension in the isotropic phase. Image analysis in the cholesteric phase has shown that light intensity prole of the bleach spot is best tted with a Bessel modied function, allowing us to determine two diusion coecients, D1 and D2, corresponding to the diusion coecients parallel and perpendicular to the local molecular orientation, respectively. In such mesophase the obtained values for the diusion coecients are around 101m2=s and 102m2=s, with an anisotropy; D1=D2 = 12. Such results are compatible with results obtained in the nematic phase of virus fd solutions. Solutions with concentrations lying in the intermediary zone presenting two or even three phase in coexistence were also investigated. By applying the two tting proles to the bleach spot it was possible to identify zones in the sample corresponding to isotropic diusion process and other zones presenting anisotropic diffusion process. This conrms the coexistence of isotropic and anisotropic phases, which cannot be identied only by optical polarized microscopy.
Bonnet, Thomas. "Caractérisation et optimisation de sources d'électrons et de photons produites par laser dans les domaines du keV et du MeV." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00982170.
Повний текст джерелаFrath, Denis. "Nouveaux complexes borates fluorescents : synthèses, propriétés et applications." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00923177.
Повний текст джерелаGerardin, Emilie. "Morphometry of the human hippocampus from MRI and conventional MRI high field." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00856589.
Повний текст джерелаKhan, Rahat. "Discriminative image representations using spatial and color information for category-level classification." Phd thesis, Université Jean Monnet - Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-01073099.
Повний текст джерелаDellinger, Jean. "Imagerie hyperspectrale en champ proche optique : développement et applications à la nanophotonique." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00908824.
Повний текст джерелаAbbas, Allaoua. "Développement d'un dispositif pompe-sonde hétérodyne : application à l'imagerie en acoustique picoseconde." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00988758.
Повний текст джерелаKenouche, Samir. "Études expérimentales et modélisation de la dynamique de distribution des agents de contraste en imagerie RMN : applications à l'agronomie." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2013. http://tel.archives-ouvertes.fr/tel-01019641.
Повний текст джерелаBenoit, Didier. "Conception, reconstruction et évaluation d'une géométrie de collimation multi-focale en tomographie d'émission monophotonique préclinique." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00949951.
Повний текст джерелаBalleyguier, Corinne. "Elastographie-IRM pour le diagnostic et la caractérisation des lésions du sein." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00824882.
Повний текст джерелаUhlíř, Vojtěch. "Dynamique de l'aimantation dans les nanostructures induite par courant électrique." Grenoble, 2010. http://www.theses.fr/2010GRENY049.
Повний текст джерелаThis thesis deals with the study of current-induced magnetization dynamics and domain wall (DW) motion in NiFe/Cu/Co nanowires, induced by the so-called spin-transfer torque effect. Prior to this work, transport measurements had proven that in this trilayer system, DWs in NiFe can be moved with relatively low current densities, suggesting a particularly high spin-torque efficiency. The aim of this study has been to use photoemission electron microscopy combined with x-ray magnetic circular dichroism at synchrotron radiation sources to observe directly the magnetic configurations in the trilayers and their evolution during and after the application of nanosecond current pulses. An important step of the work has been to optimize the growth of the NiFe/Cu/Co layers, in the view of increasing interface quality and minimize interlayer coupling. The process of nanowire patterning by e-beam lithography has also been optimized. Two kinds of measurements have been carried out: i) quasi-static measurements, where the domain configuration is observed before and after the application of current pulses and ii) dynamic measurements, where the magnetic configuration has been observed during the application of current pulses. The first measurements have allowed us to study the statistical behavior of DWs under the application of current pulses: on one hand, the domain wall velocities reach extremely high values for relatively low current densities (up to 600 m/s for 5×10^11 A/m^2). On the other hand, DW motion over distances larger than 2-3 μm is strongly hindered by pinning. We have identified the pinning of DWs in the NiFe layer as being due to crystallographic inhomogeneities of the Co layers, via magnetic dipolar effects. Time-resolved measurements during the current pulses, carried out for the first time by our team, have allowed us to demonstrate that the NiFe magnetization is strongly tilted in the direction transverse to the nanowire direction, due to the presence of a transverse Oersted field. This effect might contribute to the enhancement of DW velocities in the NiFe layers