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 39 for “"planar geometry"”.
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Model for an exciton mechanism of superconductivity in planar geometry
… of an exciton mechanism of superconductivity in planar geometry is investigated in this thesis. Upon specialization to the case of the single interface between a thin, crystalline metal film in intimate contact with a clean semiconductor substrate, a model is developed in which the metal …
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A six-degree of freedom flexural positioning stage
… actuators. The mechanism's monolithic, planar geometry is easily fabricated with low-cost manufacturing processes (such as waterjet machining). The manipulator tolerates ±1 mm actuator misalignment with less than 0.1% full-scale position error. Measurements over a 100x100x100 nm3 work …
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Planar Coils for NMR Microspectroscopy
Planar microcoils suffer from a reduced sensitivity compared to solenoidal microcoils. However, because of their planar geometry, they can be more easily fabricated and integrated into microanalysis systems through the use of microfabrication techniques. This thesis investigates the feasibility of …
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Modeling the chemical and photophysical properties of gold complexes.
… geometric, and bonding properties. The geometry of AuI complexes (ground state singlet) is very sensitive to the electronic nature of the ligands: σ-donors gave a two-coordinate, linear shape; however, σ-acceptors yielded a three-coordinate, trigonal planar geometry. Doublet AuIIL3 …
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Quantum codes on Hurwitz surfaces
… those, generating a quantum code on a locally planar geometry have lead to some interesting classes of codes. Main idea of this thesis stems from Kitaev's Toric code, which was the first surface code, yet it suffered from having a asymptotically vanishing encoding rate. In this paper, we …
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Intramolecular Ligand Permutation at Tetracoordinate and Pentacoordinate Silicon (Pseudorotation, Hypervalent)
… with a significant deviation towards the trans planar geometry; the 10-Si-5 phenylsiliconate, 2, is nearly trigonal-bipyramidal at silicon. Evidence that the bidentate ligands of 1 preferentially stabilize the trigonalbipyramidal geometry of 10-Si-5 compounds, 3, relative to 8-Si-4 and 12-Si-6 …
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Complexes of Platinum(II) and Iridium(III) with Liquid Crystal and Luminescent Properties
… of two metals, platinum(II) with its square planar geometry, and iridium(III) with its octahedral geometry, and the aim is to modify the ligand structures so that, in combination with the metal, liquid-crystalline complexes result that retain the emissive properties of the …
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Pattern formation in systems far from equilibrium
… of interfacial instability is found, in a planar geometry, indicating a non-linear selection of a unique length-scale, insensitive to short length-scale fluctuations.
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Planar Ion Probe for Low-Latitude Ionosphere/Thermosphere Enhancements in Density Cubesat Mission
… Langmuir probe instrument developed is of a planar geometry and fix biased in the ion saturation region, i.e. negative w.r.t. spacecraft chassis. Operating the Langmuir probe in the ion saturation region avoids excessive spacecraft charging on small spacecraft platforms, while also avoiding …
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Experimental and Numerical Investigations of Tubular-Shaped Direct Methanol Fuel Cells (DMFCs)
… Methanol Fuel Cell (DMFC) as an alternative geometry to the traditional planar-shaped fuel cell. The benefit of the tubular geometry compared to the planar geometry is the higher instantaneous volumetric power density provided by the larger active area, which could be beneficial in …
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The acetanilide crystal structures: packing and conformational similarities
… substituent had a larger effect on the chain geometry than the phenyl substituent. In the crystal the molecular structures deviate from the expected planar conformation. Rotation about the amide to phenyl bond of up to 55 degrees in ortho-tertbutyl acetanilide is observed. Para-substituents …
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Synthetic and computational investigations into reaction pathways towards complex heterocyclic ring systems
… for an underivatised 1,2,3,5- tetrazocine, the planar (aromatic) structure is the most stable, though this is not observed experimentally, presumably due to steric repulsions between the large aromatic substituents often used to stabilise these molecules. Excluding the planar geometry, we found …
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Aerodynamic performance of a transonic turbine blade passage in presence of upstream slot and mateface gap with endwall contouring
… 1.0Cax downstream of the trailing edge for a planar geometry and two contoured endwalls. Spanwise measurements were performed to complete the entire 2D loss plane from endwall to midspan, which were used to plot pitchwise averaged losses for different span locations and loss contours for the …
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Thin film integrated optical waveguides for biosensing using local evanescent field detection
… can be used to form a waveguide with a planar geometry. The planar design allows the upper cladding refractive index to be modified by attaching proteins or patterning organic films. This design also allows the evanescent field intensity to be measured using near field scanning optical …
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Characterization of materials using stripline resonators
… of materials used in the construction of planar geometry transmission lines and circuits. The method characterizes both dielectric and conductor materials. It can be used to find the relative dielectric constant and to separate the conductor and dielectric losses. The separation of the …
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Progettazione di un device di imaging tomografico, basato su principio impedenziometrico, per la valutazione di cicli cardio-respiratori in atleti
… A belt with 32 electrodes in circular and planar geometry was built for two dimensional samples. The developed device provides current less than 1mA with frequencies higher than 60KHz. This are safe value for human body. The data processing was accomplished by utilizing a web site for the …
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Mathematical and fuzzy modelling of high-speed interconnections in integrated circuits.
… popular interconnection type mainly due to its planar geometry. The mode of propagation is almost a transverse electromagnetic mode of wave propagation (TEM) and can be described by the Telegrapher's equations. These facts make mathematical and fuzzy modelling of microstrip lines possible.Two …
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Growth and application of planar III-V semiconductor nanowires grown with MOCVD
… and alignment on a wafer-scale. In this thesis, planar III-V nanowires are introduced as a low-defect and integratable nanotechnology building block grown with metalorganic chemical vapor deposition. Planar GaAs nanowires grown with gold seed particles self-align along the <110> direction on the …
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Multi-photon decay mode spectroscopy of positronium
… settings. The detectors were situated in a planar geometry, where the source-to-detector distance of the detector system was selected such that the effect of peak pulse pile-up was minimised (to less than 3%), while maximising the full-energy peak detection efficiency at 511 keV (to 3%). For …
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In vitro studies of dermally absorbed Cu(II) tripeptide complexes as potential anti-inflammatory drugs
… copper(II) complexes tend more towards a square planar geometry, rather than the expected tetragonally distorted octahedral geometry. All the nickel(II) species, were square planar, except for the ML species, which was octahedral. The ligand coordinated to the metal ion via an amine-N, two …
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