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 174 for “"Tunnelling"”.
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Tunnelling
Thesis: B.S., Massachusetts Institute of Technology, Department of Civil Engineering, 1875
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The umbrella method in tunnelling
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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Ground movements during tunnelling in sand
During soft ground tunnel construction, if the face pressure of a tunnel boring machine is not strictly controlled, excessive ground movements will propagate vertically upwards causing significant damage to adjacent buried infrastructure and surface structures. In order to investigate the face …
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AN INVESTIGATION OF INELASTIC ELECTRON TUNNELLING SPECTROSCOPY
… programme to investigate Inelastic Electron Tunnelling Spectroscopy (lETS). A description of the technique of lETS is given. As the main aim of this work was to produce a working facility for lETS, details of the construction of an lET spectrometer are given. This is followed by a description …
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Molecular manipulation with the scanning tunnelling microscope
… into molecular manipulation using scanning tunnelling microscopy (STM), dissociation of chrolobenzene (PhCl) and of 4,4´ dichlorobiphenyl (PCB) manipulation both on Si(111)-7×7 surface. An ab initio investigation is presented on a possible candidate for future atomic manipulation. The …
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Plasmonic interactions in the quantum tunnelling regime
… for the quantum regime of optically driven tunnelling plasmonics is revealed in unprecedented detail. It is demonstrated that quantum mechanical effects are critically important at approximately the 0.3 nm scale where spatially non-local tunnelling plasmonics controls the optical response. …
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Tunnelling Effects on Bored Piles in Clay
… Significant tunnel construction, using various tunnelling techniques, has been undertaken in a number of major cities in recent years. The ground is subjected to stress relief during tunnelling; this propagates through the soil to the foundations of buildings and infrastructure close to and …
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Electron Tunnelling Study of High-Temperature Superconductors
… The aim of this work was to use electron tunnelling spectroscopy to measure the density of excitation states of the recently discovered high-temperature superconductors. Tunnelling is the most sensitive method for measuring a superconductor’s energy gap, and historically has provided …
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Scanning tunnelling microscopy of metal reactions with silicon.
I present the results of several investigations into the reactions that take place behveen transition metals and the silicon (111) surface. The ability of the STM to measure physical and electronic structure on an atomic-scale permitted the detailed study of several new phenomena. The reactions …
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INELASTIC ELECTRON TUNNELLING SPECTROSCOPY (lETS) OF SILANE COUPLING AGENTS
Inelastic Electron Tunnelling Spectroscopy (lETS) has been used to study monolayers of silane coupling agents adsorbed on aluminium oxide. The technique of lETS is surface specific and uses electrons to excite vibrational modes of the adsorbate. Since the tunnelling electrons perturb both the …
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An investigation of electron tunnelling and conduction in Langmuir films
… conduction mechanism is direct electron tunnelling between the metal electrodes. This has been confirmed with the aid of additional experiments, including consideration of the role of the oxide film(s) invariably present in the canpleted device and investigation of the inelastic component …
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A DIGITAL DATA ACQUISITION SYSTEM FOR INELASTIC ELECTRON TUNNELLING SPECTROSCOPY
A digital inelastic electron tunnelling spectrometer has been designed, constructed and implemented. Full details of hardware software and calibration are presented. The spectrometer has been used in a detailed inelastic electron tunnelling spectroscopy (IETS) study of benzoate anion (C6H5C00) …
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Strong physical uncloneable functions using arrays of resonant tunnelling diodes
… request which cannot be impersonated. A resonant tunnelling diode has been shown useful by having a single unique and uncloneable response. The electrically driven device outputs a signature unique to the individual device which is uncloneable even by the manufacturer. The purpose of this work is …
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Application of Femtosecond lasers in confocal and scanning tunnelling microscopy
… towards the development of an ultrafast Scanning Tunnelling Microscopy (STM) technique, employing a Ti:sapphire pulsed laser, called Shaken Pulse Pair eXcitation (SPPX) STM. Measurements of the laser intensity, pulse duration and point spread function are used to estimate the peak intensity at the …
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