Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 60 for “"High magnetic fields"”.
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Martensitic transformations in high magnetic fields.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Metallurgy and Materials Science, 1973
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Two-dimensional coupled electron-hole layers in high magnetic fields
Contains fulltext : 18860.pdf (Publisher’s version ) (Open Access)
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Dynamic nuclear polarization of biological systems at high magnetic fields
… nuclear polarization methods were studied at high magnetic field strength and were applied to improve the sensitivity of the nuclear magnetic resonance spectroscopy of biological solids. Studies of the dynamics of electron-nuclear polarization transfer via the solid effect and thermal mixing …
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Optical spectroscopy of single-walled carbon nanotubes in high magnetic fields
Magnetic flux threading a single-walled carbon nanotube (SWNT) is predicted to influence its electronic structure through the Aharonov-Bohm (AB) effect, causing bandgap oscillations and absorption peaks splitting. In order to verify these predictions, near infrared (NIR) photoluminescence (PL) and …
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Investigation of material properties by NMR in low and high magnetic fields
… investigation with a wide range of applications. Magnetic resonance is used in medicine, the oil industry, food industry, for chemical analysis, quality control in industry and construction, analysis of cultural heritage, and materials science, in particular polymer analysis. The unique feature of …
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Spectroscopy of Two-Dimensional Excitons in High Magnetic Fields to 30 Tesla
… on excitons through observation of diamagnetic shifts and Zeeman splittings, but high magnetic fields are required to observe these effects in two-dimensional semiconductors due to enhanced binding energies compared to bulk systems. We have developed a unique magnetospectroscopy setup …
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The behavior of thin-film superconducting-proximity-effect sandwiches in high magnetic fields
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Physics.
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Unconventional Fermi surface in insulating SmB6 and superconducting YBa2Cu3O6+x probed by high magnetic fields
… In this thesis, techniques developed to prepare high-quality single crystals of SmB$_6$ and YBa$_2$Cu$_3$O$_{6+x}$ (abbreviated as YBCO$_{6+x}$ hereinafter) are described. By utilising measurement techniques of exceptional sensitivity and exploring a wide range of temperatures, magnetic fields, …
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Antriebs- und Meßtechniken für die Qualifizierung von Teilchenbeschleunigermagneten
… to cope with unusual environmental conditions: High magnetic fields, casual vacuum and narrow space. This document discusses instrumentation solutions suited for use in magnetic fields of 8,5 Tesla by the example of a robot probe built for CERN's Large Hadron Collider LHC. The probe will measure …
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Molecular Dynamics and Spin-Spin Interactions in Complex Systems: High Field and Multifrequency EPR Approach
It is shown that at high magnetic fields the Gd$\sp{3+}$ ion itself serves a sensitive probe for the microenvironment. This sensitivity allows, for example, observation of pH changes and measurement of partitioning of the lipophilic Gd$\sp{3+}$ complexes within the phospholipid membranes. …
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Terahertz waveguide spectroscopy of two-dimensional plasmons in GaAs
The electrical characteristics of high-mobility, two-dimensional electron gas (2DEG) systems, such as GaAs quantum wells, have been well-studied at low frequencies and in extreme conditions of high magnetic fields and ultralow temperatures. While high-frequency excitations of 2DEGs have been …
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Proton-coupled carbon-13 sample spinning NMR studies of macromolecules and ordered systems
… behavior, by Carbon-13 ($\sp{13}$C) nuclear magnetic resonance (NMR) spectroscopy. We find that under ""magic angle"" spinning (MAS) these systems display high resolution due to extensive motions, and therefore traditional proton-decoupling is not necessary. In the absence of proton …
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Ultracold bosons in optical lattices for quantum measurement and simulation
… physical system, and have found uses in both the fields of quantum measurement and quantum simulation. Optical lattices, created by the AC Stark shift of a coherent laser beam, are a versatile tool to control ultracold atoms and implement novel Hamiltonians. In this thesis, I report on three …
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Tunable High-Field/ High-Frequency ESR and High-Field Magnetization on Single-Molecule Clusters
… clusters have been studied by application of high magnetic fields. The magnetization has been probed with an MPMS as function of temperature and field. The combination with pulse field measurements up to 52\,T allowed determination of the magnetic exchange coupling parameters, and to probing …
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Flux Pumping for High-Tc Superconducting (HTS) Magnets
High Tc superconductors are enabling in the generation of extremely high magnetic fields. Flux pumping is a promising technology which can be used to operate HTS magnets without significant loss. In this decade, several HTS flux pumps based on travelling magnetic waves have been developed, yet …
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Inherent insensitivity to RF inhomogeneity in FLASH imaging
… problem in practice and becomes severe at high magnetic fields due to the dependence of B1 on the sample. It leads to nonuniformities in image intensity and contrast, causing difficulties in quantitative interpretation and image segmentation. In this thesis, we report an interesting …
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Ultracold molecules from ultracold atoms : interactions in sodium and lithium gas
… gases were studied near a Feshbach resonance at high magnetic fields. The enhanced interactions between atoms in the presence of a molecular state enhance collisions, leading to inelastic decay and loss, many-body dynamics, novel quantum phases, and molecule formation. Experimental data is …
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The microstructure, mechanical and superconducting properties of (RE)BCO bulk single grains
High-temperature superconducting RE-Ba-Cu-O bulk single grains [(RE)BCO, where RE = Y, Gd, Eu, Sm or Nd] show a wide variability in their mechanical and magnetic flux trapping properties. These variations attribute primarily to variations in the microstructure of (RE)BCO bulk materials. While the …
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Theory of d₀ perovskites and their heterostructures
… - de Haas effect in lightly doped STO to high magnetic fields. Then a simplified electronic structure model is developed for surfaces and interfaces. This model includes non-linear and non-local screening effects by a single polar lattice mode. Generalization of the lattice screening model …
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Dynamic Resistance of High-Tc Superconductor and Its Application in Flux Pumped Superconducting Magnets
High temperature superconductors are ideal materials for use in extra high magnetic fields owing to their capability of transporting high-density DC current with little power loss. Hence, superconducting magnets are already widely used in areas such as magnetic resonance imaging (MRI), particle …
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