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 24 for “"Radiative processes"”.
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Modeling non-radiative processes in solar materials
… The second chapter examines how to predict the radiative and non-radiative decay rates of a large family of naphthalene derivatives. Naphthalene is a common building block in many organic electronic devices and possesses complex photophysics that are difficult to capture. Principally using …
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Dynamical and radiative processes in the Upper Troposphere/Lower Stratosphere
… understanding of certain key attributes and processes in the Upper Troposphere/Lower Stratosphere (UTLS). This work involves exploring the interactions between radiation and dynamics which ultimately affect the destination of chemical constituents. A recently identified feature of the …
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Kinetics and radiative processes of a xenon and iodine inductive RF discharge at low pressure
… is conducted to determine the kinetics and radiative processes involved in a low pressure, $0.5-5$ torr, discharge sustained in Xe and I$\sb2.$ The discharge is excited with an RF inductive power source. The diagnostics applied in this study include laser-induced fluorescence (LIF), …
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STRUCTURAL AND OPTICAL PROPERTIES IN POROUS NANOSTRUCTURED SEMICONDUCTORS
Non-radiative processes in porous silicon (PS) have been examined using a variety of techniques to examine the effects on photoluminescence (PL) in order to determine the nature of the PL process and the ability to modulate this for eventual incorporation of the material within devices. Voltage …
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Radiation emission and absorption in a hydrogen plasma of a laser engine
In this work, we describe all the possible radiative processes occurring in a low temperature hydrogen plasma. Some of the fundamental concepts involving ionized gases and collision phenomena are presented, and a rigorous approach is used to show that classical mechanics is quite appropriate to our …
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The impacts of atmospheric radiation on studies of planetary habitability
… possible without a detailed understanding of the radiative processes occurring in a planet’s atmosphere. In this work, studies of the radiative flux and transfer within planetary atmospheres are carried out in order to elucidate whether certain planetary bodies may be habitable. The first section …
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Gamma-Ray Observations of X-ray Binaries
… our knowledge of particle acceleration and radiative processes in the jets. The implications have far reaching consequences on the understanding of other XRBs and microquasars and also of active galactic nuclei, which are in many ways similar to microquasars and are prominent VHE gamma-ray …
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NLO Rutherford Scattering and the Kinoshita-Lee-Nauenberg Theorem
… by including all initial and final state soft radiative processes, including absorption and an infinite sum of partially disconnected amplitudes. Crucially, we exploit the Monotone Convergence Theorem to prove that our delicate rearrangement of this formally divergent series is uniquely …
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Towards broadly-tunable CMOS-compatible silicon light sources in the near-infrared
… indirect bandgap and the short lifetime of non-radiative processes such as Auger recombination. Nonetheless, the realization of an energy efficient silicon-based photon source could find broad applicability in areas such as ultra-large scale integration (ULSI), optoelectronic displays and …
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General relativistic radiation magnetohydrodynamics, with applications to black hole accretion disks
… the balance of advection, viscous heating, and radiative interactions. At the lowest accretion rates, radiative processes may be safely ignored, and electrons are nearly virial. Advection carries the lion's share of this internal energy through the event horizon. At near-Eddington accretion …
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Superradiant Emission from Delocalized Frenkel Excitons in Molecular J-Aggregates
… in particular, superradiant emission with short radiative lifetimes and narrow linewidths. Despite these favorable optical properties, fundamental studies as well as applications of J-aggregates as high-speed light sources have been hindered by their low photoluminescence quantum yields (QYs), …
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Kinetics and radiactive processes of a XE and I2 inductive RF discharge at low pressure
… is conducted to determine the kinetics and radiative processes involved in a low pressure, 0.5 - 5 torr, discharge sustained in Xe and I 2 • The discharge is excited with an RF inductive power source. The diagnostics applied in this study include laser-induced fluorescence (LIF) I absorption …
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A Study on the Diurnal and Seasonal Cycles of Tropical Cirrus Clouds
Tropical cirrus clouds (TCC) regulate the Earth’s radiative energy budget. However, mechanisms of the diurnal and seasonal cycles of their occurrence still require further investigation due to limited observations. This study utilizes observational data from the Cloud-Aerosol Transport System …
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Limb scatter measurements of high altitude cloud distributions
… involved in the dynamical, chemical, and radiative processes within the upper troposphere and lower stratosphere. Cirrus clouds occur at high altitude around the tropopause level and, despite their thin appearance and low optical thickness, they contribute to the radiative balance of the …
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Radiation Transport in Low Pressure Plasmas: Lighting and Semiconductor Etching Plasmas
… processing, the role of UV photons in surface processes is a side product and is poorly understood. Since the basic surface reaction mechanisms in semiconductor processing are now being developed, it is an opportune time to investigate the role of UV photons. As lamp geometries become …
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Two-state systems with non-Markovian thermal and squeezed quantum noise inputs
… of the effect of squeezed light on fundamental radiative processes in simple atoms have revealed interesting possibilities, most notably line-narrowing in the fluorescence spectrum. The original analyses in this field of research have been based on the assumption of broad bandwidth squeezing, …
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A theoretical study of relativistic jets and accretion processes
… jets, a study of the electron-positron pair processes is also included in the present work. The electron-positron pair annihilation is implemented in an existing Comptonization code (simulating the corona) to explore the possibility of masking an annihilation line from the X-ray binary …
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Modelling Mesopause OH* Emissions using a Global Circulation Model
… our understanding of the physical, chemical and radiative processes of the middle atmosphere. In this thesis, a one-dimensional (1-D) model of the first nine vibrational states of OH* is developed and incorporated into the University College London CMAT2 GCM. Unlike in other GCMs these …
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Fluorescence Enhancement Strategies for Polymer Semiconductors
… mobility, whilst independently controlling the radiative and non-radiative processes. To date there has existed a seeming trade-off between charge carrier mobility and photoluminescence efficiency, which limits the development of some devices such as electrically pumped laser diodes. This thesis …
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Radiative signatures of the jet launching region in astronomical objects
… aspects of jet launching by calculating the radiative properties of the inner accretion flow and jet launching region in a range of low-luminosity accreting black hole systems. We treat the plasma dynamics using sophisticated general-relativistic magnetohydrodynamic simulations, and calculate …
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