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 15 of 15 for “"Emission mechanism"”.
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Field emission from carbon nanotubes deposited on platinum and nickel/nickel oxide multilayers
… field emitters, very little is known about the emission mechanism. This work strives to gain insight on field enhancement in films of single-walled carbon nanotubes by studying the internal field emission between the back contact metal and the nanotubes, and the external field emission between …
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Plasma processes in pulsar environments
… by their periodically pulsed electromagnetic emission. The source of the radiation is believed to be associated with the electron-positron (pair) plasma populating the pulsar magnetosphere. The theory of pulsar radiation is still in its infancy and there is lack of understanding about the …
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Non-metallic cold-cathode electron emission from composite metal-insulator microstructures
… been undertaken into a field-induced electron emission (FIEE) mechanism that occurs at microscopically localised `sites' on uncoated, dielectric-coated and composite-coated metallic cathodes. An optical imaging technique has been used to observe and characterize the spatial and temporal …
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Investigation of a Reproducible Boiling Phenomenon with Relevance to Volcanic Lightning
… charging is in evidence. <br></br><br></br>The mechanisms by which charged particles are emitted and formed into hollow solute spheres have been investigated and their charge and size distributions determined. Their structure has been compared with the structure of particles produced by flash …
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Solar eclipse observation on may 21, 2012 from JVLA
… limb. This study is an attempt to understand the emission mechanism in the active region structures and the quiet Sun regions by realizing the change in the intensity levels of the observation than the intensity itself. During this work, it is discovered at least one anomaly in the data, called …
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Spectroscopic Studies of Excited States in Carbene-Metal-Amide Emitters
… of new materials for and approaches to light emission in OLEDs is a very active area of research. Carbene-Metal-Amides (CMAs) are a recent class of organometallic semiconductors with proposed applications in high-performance OLEDs. Fast triplet harvesting in CMAs occurs through thermally …
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Pattern-forming in non-equilibrium quantum systems and geometrical models of matter
… - the possibility of controlling the vortex emission mechanism and the use of pumping strength as a control parameter - and improves on existing proposals for superfluid-based gyroscopes. Finally, the important rôle played by quantum pressure in the recently observed transition from a …
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Terahertz Time-Domain Spectroscopy of Low-Dimensional Materials and Photonic Structures
… oriented pyrolytic graphite (HOPG) using the THz emission spectroscopy. The direction, spectrum, polarization and dynamics of the emitted THz radiation from graphite upon ultrafast photoexcitation reveal the emission mechanism as well as the out-of-plane transport properties of graphite. </p><p>In …
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Characterization and modeling of silicon and silicon carbide power devices
… Schottky/JBS diodes by including the thermionic-emission mechanism in the low-bias range. The newly derived model equations have been implemented in Saber circuit simulator using MAST language. An automated parameter extraction software package developed for constructing silicon (Si) and silicon …
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MICROWAVE BACKGROUND GROUND-BASED OBSERVATIONS
… the atmospheric spurious signal. The absorption-emission mechanism of the water vapor mixed in the atmosphere is particularly strong in the microwave bandwidth, increasing the total balance of the white noise of the instrument. The water vapor is not well mixed in the atmosphere producing a …
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X-Ray studies of the physics of matter around super-massive black-holes in nearby Seyfert galaxies
… and, thus, it was also used to test the emission mechanism models; finally, the XMM–Newton sample was extracted from the X-CfA sample so as to ensure a truly unbiased and well defined sample of objects to define the average properties of Seyfert galaxies. Taking advantage of the …
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Electroluminescence in ion gel gated organic polymer semiconductor transistors
This thesis reports the light emission in ion gel gated, thin film organic semiconductor transistors and investigates the light emission mechanism behind these devices. We report that ion gel gated organic polymer semiconductor transistors emit light when the drain source voltage is swept slightly …
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Sampling the Radio Transient Universe: Studies of Pulsars and the Search for Extraterrestrial Intelligence
… objects, chief among them the nature of their emission mechanism. Nevertheless, the wealth of phenomena exhibited by pulsars make them one of the most useful astrophysical tools. With their high densities, pulsars are probes of the nature of ultra-dense matter. Characterized by their high …
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A Study of Dynamical and Emission Variabilities in Pulsars
… behaviors. This is certainly true for their emission mechanism, which is still not fully understood. This is primarily because of the abrupt changes that appear in the pulse profile. Recent discoveries have shown that these emission changes effect the spin dynamics, particularly the spin-down …
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A Pathway to EMU: the SCORPIO Project
… as much information as possible about the radio emission. Secondly, we wanted to know how to address the issues that comes from a blind survey on a area of the Galactic Plane, such as issues due to the complex structures present in the GP; issues due to the presence of variable sources; issues …