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 “"self-absorption"”.
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Fabrication of a luminescent solar concentrator that minimizes self-absorption losses using inter-chromophore energy transfer
… A major limitation to LSC efficiency is self-absorption between different chromophores within the waveguide. Finding inspiration from the architecture of phycobilisome antenna complexes, a system of chromophores is developed that minimizes self-absorption through Firster energy transfer. …
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Advancements in nuclear waste assay
… the inadequacies of current techniques, a new Pu self-absorption correction method has been developed using the data from numerical simulations, allowing nature to reveal the correlations rather than traditional approaches based upon approximate models. For a 25g 1cm-high Pu flat-plate of density …
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Ultra thin micro solar cells with concentration optics: fabrication, modeling and characterization
… of emitted light due to poor wave guiding and self-absorption of emitted light by the fluorophore. Together these effects have limited the possible collecting efficiency in LSC structures. Using a distributed array of micro-solar cells, the wave guiding loss and self-absorption loss can be …
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Search for the Mössbauer Effect in 109Ag
… dissertation reports the results of a series of self-absorption experiments using <sup>109</sup>Cd-doped single-crystal samples of natural silver to observe the Mossbauer effect in <sup>109</sup>Ag. In addition to measuring the temperature dependence of the 88-keV gamma rays emanating from the …
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Engineering the optical properties of luminescent solar concentrators at the molecular scale
… circumvent transport losses caused by photon re-absorption. The selfassembled structure of phycobilisomes couples numerous donor chromophores to a handful of acceptor chromophores through an internal F6rster energy pathway that isolates the absorption and emission spectra. We established that …
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Molecular and Polymeric Materials Based On Asymmetrically Substituted BF2 3-Cyanoformazanates
… increased; this was due to less quenching/self-absorption from nearby chromophores. Thermal and electrochemical properties of all polymers are described.
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Resonant photon scattering from isotopes of lead and bismuth
… seven transitions in 208Pb were obtained from a self-absorption experiment. The results are compared with results from earlier spectroscopic studies and from average photon scattering cross section measurements. The spectra of 207Pb and 209Bi are discussed in terms of the excitations of the 208Pb …
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"The New Millennium's Passion for Standing Live Witness to Things:” The Epidemiology of Isolation, Addiction and Redemption in David Foster Wallace’s <em>Infinite Jest</em>
… form of addiction. This addiction manifests itself in the form of an extreme dependence on drugs and/or technology to escape reality. This thesis first discusses the effects of technology on a society that is lonely and isolated. Then, two major characters with substance abuse issues are …
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An investigation into the limitations of myocardial perfusion imaging
… further aspect investigated was the impact that self-absorption in the heart has on these defects. The variability of these defects were further investigated by altering the position and orientation of the heart itself within the thorax and determining the effect it has on the attenuation defects …
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Modeling and Design of Betavoltaic Batteries
… overpredicted the experimental results when self-absorption was not considered. Therefore, the percentage of self-absorption and the source thickness were estimated using a radioisotope source model. It was then validated with the thickness calculated from the specific activity of the …
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In vitro metabolism of uniformly labeled glucose-C14 by bovine rumen microorganisms
… plating technique. Corrections for geometry, self absorption, and efficiency were made by direct plating additional triplicate fraction subsamples, each containing a uniformly labeled glucose-C¹⁴ internal standard. The data were expressed as per cent recovery of added C1u. The results …
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Organic photovoltaics and concentrators
… solvation, and phosphorescence. By reducing self-absorption losses, we demonstrate optical flux gains an order of magnitude greater than previously published results and thereby reduce the effective cost of inorganic solar cells by at least a factor of ten. Combined with the potential for low …
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Fabrication and applications of fluorescent polymer fibres
… to untrapped light, then a slower decay due to self-absorption and other loss processes. These structures exhibited concentration ratios in the region of 20-50.
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Statistical study of solar radio bursts
… predictions following from the gyrosynchrotron selfabsorption origin of the low frequency turnover of the spectrum. However, for some events the peak frequency increase is much smaller than expected or even absent. It was found that the peak frequency almost always increases on the late decay …
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Co-evolution of microstructure and dislocation dynamics in InGaP/GaP : engineering high quality epitaxial transparent substrates
… 60% and drops spectral width 8 meV. Since self-absorption in [Delta]x [lnxGai-x]P/G<t.P is >90%, a fully transparent [Delta]x,y [inx(AlyGa1_y)i-x]P/GaP technology was also developed and initial results promise an order of magnitude improvement in device efficiency. The improvements from …
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Radio & Infrared Observations of the W3/W4/W5 Star-forming Regions
… some localised regions demonstrating free-free self-absorption (§ 2), although we suspect a complete turnover of the H II regions outside of our observed range < 30 MHz. We obtain a spectral index of <i>ɑ</i> ~ -0.03±0.02 for 3C 58 and observe a possible plateau in the emission of HB3 near ~ 55 …
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Organizational Culture and Identity: A Case Study from the Australian Football League
… coaches. The first period comprised a time of self-absorption with an inappropriate culture that saw it in frequent conflict with external stakeholders as on-field success eluded it. Despite establishing a strong and clearly defined identity, FFC's inward looking culture undermined its capacity …
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Sub-nanosecond UV filaments and their applications for remote spectroscopy and high-voltage discharges
… is carried out for LIBS. The dynamics of self-absorption dip in LIBS spectrum is investigated, which can be further applied for the high resolution spectroscopy. The last application is filament-induced high-voltage discharge. A fully guided 40 cm long discharge is demonstrated with the UV …
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Moments of Absorption
Moments of Absorption explores the conceptual and visual themes that are presented in my MFA thesis exhibition. The research looks into the absorption of the nude subject, the gestures that communicate this absorption, and the domestic space as a stage for the presentation of these gestures. This …