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 19 of 19 for “"transport measurement"”.
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Passenger assessments of quality in local public transport- measurement, variability and planning implications
… more detailed basis for planning of local public transport. With more knowledge of how segments of travellers assess different parts of a journey, bus routes can be planned to fit either all passengers or selected groups better. It will also be possible to evaluate perceived travel utility …
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The Edge States of Epitaxial Graphene on SiC
Exceptional ballistic transport was observed in sidewall epitaxial graphene nanoribbons on SiC (SWGNRs) at room temperature. These objects are of fundamental interest as they provide a direct access to charge neutral graphene with excellent transport properties. In this thesis, beyond sidewalls, we …
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Study of Spin Configuration of Hexagonal Shaped Ferromagnetic Structures
… imaging, structural modification and electrical transport measurement on ferromagnetic structures. For the latter, hexagonal ferromagnetic structures were investigated due to its uniqueness of having a vortex state with well-defined, symmetric and moderate stray field for desirable magnetostatic …
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Radiation Effects on Thermal Properties of Advanced Nuclear Materials
… and its correlation to macroscopic thermal transport phenomena remain insufficiently characterized. In this work, ZrH and YH specimens were characterized pre- and post-irradiation via laser flash analysis, high-resolution dilatometry, and differential scanning calorimetry. Comparative …
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Radiation damage assessment of atomically thin membranes
… the methodologies and results of gas transport across atomically thin membranes, which are relevant to reducing Tritium inventory in fusion reactors by separating Helium from the plasma exhaust stream. A novel experimental apparatus and set-up is devised to measure the gas transport …
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Spin-Orbit Coupling in SrTiO3/Si Thin Films at High Carrier Concentration
… conduct the experiment. I am doing the magneto transport measurement at different temperature and the magnetic fields with different magnetic field orientations. It is very necessary to calibrate the Horizontal rotator positions, which is explain in chapter four. Chapter five talks about the …
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Scanning tunneling microscopy characterization and metallic nanocontacts for atomically precise graphene nanoribbons
… semiconducting substrates. Detailed STM and STS measurements of doublewide GNRs on InAs(110) and InSb(110) confirmed their geometries and revealed a 2 eV bandgap as well as the 3-D distribution of the local density of states. Computational modeling of the ribbon´s electronic structure showed good …
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Surface functionalization of graphene devices
… spectroscopy, atomic force microscopy (AFM) and transport measurement. A schematic picture of how the chlorine plasma interacts with graphene was also proposed. Hydrogenation and fluorination were also conducted and analyzed as comparison. We demonstrated that chlorination in graphene via plasma …
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Parallel Fabrication and Transport Properties of Carbon Nanotube Single Electron Transistors
… nanotubes (SWNTs) and studied their electron transport properties. The approach is based on the assembly of individual SWNTs via dielectrophoresis (DEP) at the selected position of the circuit and formation of tunnel barriers on SWNT. Two different techniques: i) metal-SWNT Schottky contact, …
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Wind Induced Ground Motion
… stress at the ground surface is developed. Field measurements are conducted at a site in Marks, MS, having a flat terrain and low ambient seismic noise under windy conditions. Multiple triaxial geophones are deployed at different depths to study the wind-induced ground vibrations as a function of …
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Magnetic reversal of artificial spin ice
… spin ice. Through the systematic study of the transport properties for finely varied magnetic field directions, I find that the vertices of connected brickwork artificial spin ice control its transport characteristics despite their relatively small extent. In addition, I find that the ground …
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Non-equilibrium spin accumulation in Co2FeMnSi/n-GaAs heterostructures
… This section also outlines the basic electrical measurements used to study spins in GaAs, and outlines the results determined from studies of Fe/GaAs heterostructures. In Chapter 2 we apply this knowledge to a new class of ferromagnetic materials. We present electrical spin transport measurement …
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Aerosol transport by coughing in a depressurized and air-conditioned chamber
… and temperature are all key factors of aerosol transport. To study the transmission of disease by human coughing in a depressurized air-conditioned chamber, there are many technical challenges, including the following: 1) the study of simulating human coughing; 2) the collection of aerosol …
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Engineering superconductivity in ballistic semiconductor nanowires
… readout nanostructures should support ballistic transport. This thesis focuses on the resolution of these problems by realizing ballistic superconducting nanowire devices. The first set of experiment we perform focus on realizing nanowire quantum point contacts in InSb nanowires. In previous …
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Prozessierung und elektrische Charakterisierung von ZnSe Heterostrukturen in verschiedenen Messgeometrien zum eindeutigen Nachweis der elektrischen Spininjektion
2-Punkt Transportmessungen, die in der Vergangenheit an ZnSe-basierenden DMS/NMS/DMS Multischichtsystemem durchgeführt wurden, zeigten eine 25-prozentige Erhöhung des Widerstandes beim Übergang vom unpolarisierten in den polarisierten Zustand des DMS. Dieser Magnetowiderstandseffekt wurde durch …
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Quantum Hall transport in graphene and its bilayer
… energy Landau level. In this thesis, we present transport studies at high magnetic field on both monolayer and bilayer graphene, with a particular emphasis on the quantum Hall (QH) effect at the charge neutrality point, where both systems exhibit broken symmetry of the degenerate Landau level at …
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Investigation on High-Mobility Graphene Hexagon Boron Nitride Heterostructure Nano-Devices Using Low Temperature Scanning Probe Microscopy
… at visualising the ballistic and topological transport on the high-mobility graphene/boron nitride heterostructure using the scanning gate microscope. For the first experiment, we use the scanning gate microscopy to map out the trajectories of ballistic carriers in high-mobility graphene …
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Electronic properties of topological semimetal candidates ACd$_2$Pn$_2$ (A = Eu, Sr; Pn = As, Sb)
… Weyl semimetal. The earlier studies of magneto-transport and photoemission seem to agree with the existence of the Weyl semimetal phase, however, the direct observation of Weyl crossings of EuCd$_2$As$_2$ is lacking. In this study, through materials synthesis, materials characterization, and …
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Engineering relativistic fermions in condensed matter systems
… confirming the strain induced superlattice transport behavior in graphene, demonstrating graphene-nanoparticle heterostructure as a promising platform to generate artificially engineered Dirac fermions with the goal of realizing band structure engineering. We then extend our understanding of …