Browsing Physics, Engineering Physics and Astronomy, Department of by Title
Now showing items 245-256 of 256
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Ultrafast Dynamics in Single Layer Molybdenum Disulfide
Molybdenum disulfide, a transition metal dichalcogenide (TMD), has a direct band gap of 1.89 eV when thinned down to a single molecular layer. Exciton recombination pathways and lifetimes have been previously studied, but ... -
Ultrafast Dynamics of Individual Air-Suspended Single-Walled Carbon Nanotube
(2008-09-03)Thorough understanding of the electronic and optical properties of single-walled carbon nanotubes (SWCNTs) will no doubt benefit future technological applications. Since the discovery of band gap photoluminescence from ... -
Understanding Magnetic Flux Leakage from Gouges and Dents Containing Gouges
(2012-01-30)Magnetic flux leakage (MFL) is the most widely used non-destructive evaluation (NDE) technique for operating gas and oil transmission pipelines. The Queen’s Applied Magnetics Group (AMG) has been studying MFL signals from ... -
Unraveling the nucleation and growth of spontaneous surface relief gratings with thin films of Disperse Red 1 glass
(Elsevier, 2016-10-01)Nucleation and growth of spontaneous surface relief gratings (SSRGs) on a Disperse Red 1 (DR1) glass-forming derivative were investigated. No interference pattern is applied and surface patterning is induced using single-beam ... -
Using High-Resolution Spectroscopy To Improve The Determination Of Effective Temperatures OF Pre-Main Sequence Stars
(2009-02-17)Herbig Ae/Be (HAeBe) stars are the pre-main sequence progenitors of main sequence A and B stars, and are characterized observationally by strong emission in spectral lines and significant infra-red excess that results from ... -
Using phase-space localized basis functions to obtain vibrational energies of molecules
(2016-09-20)For decades scientists have attempted to use ideas of classical mechanics to choose basis functions for calculating spectra. The hope is that a classically-motivated basis set will be small because it covers only the ... -
Validation of conformal radiotherapy treatments in 3D using polymer gel dosimeters and optical computed tomography
(2008-12-18)Polymer gel dosimeters are a three dimensional (3D) dosimetry system that may be conveniently applied for verifying highly conformal radiation therapies where standard dosimetry techniques are insufficient. Polymer gel ... -
A Vertical Coarse Approach Scanning Tunneling Microscope
(2009-06-25)A Pan-style scanning tunneling microscope (STM), with a vertical coarse approach mechanism, was designed, built and tested. The microscope will be operated in ultra-high vacuum and also at cryogenic temperatures (8 K) ... -
The Volume of Black Holes
(2012-06-06)The invariant four-volume ($\mathcal V$) of a complete four-dimensional black hole (the volume of the spacetime at and interior to the horizon) diverges. However, if one considers the black hole resulting from the gravitational ... -
Wet-etched phononic crystal waveguiding on GaAs
(IOP Publishing, 2018-01-10)A wet-etched phononic crystal waveguide in GaAs with approximately two micron deep inclusions is studied both numerically and experimentally for controlled surface acoustic wave propagation. Numerically, the phononic crystal ... -
The White Beam Steady-State Diffractometer: A Next Generation Neutron Diffraction Strain Scanner
(2009-04-24)This project proposes a reactor-based instrument, which retains most of the above advantages of spallation source engineering instruments, while maintaining the advantages inherent to steady-state instruments. The main ... -
A Zinc(II) Benzamidinate-N-oxide Complex as an Aggregation-Induced Emission Material: toward Solution-Processable White Organic Light-Emitting Devices
(Wiley, 2018-10-11)The synthesis, characterization, photophysical and redox properties of a dinuclear complex Zn2(AMOX)4 (AMOX = 4-bromo N,N’-diphenylbenzamidinate-N-oxide) are highlighted. This compound is a first example of a novel class ...