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 106 for “"TEC"”.
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Medium Scale Travelling Ionospheric Disturbances sensed with GNSS TEC and SuperDARN
… Satellite Service (GNSS) Total Electron Content (TEC) techniques and coherent scatter radars such as the Super Dual Auroral Radar Network (SuperDARN). MSTIDs, especially those observed during quiet times and on the night side, have been known to be driven by electrodynamic instability processes, …
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Quantification of Effect of Solar Storms on TEC over U.S. sector Using Machine Learning
… their effects on the total electron content (TEC) in the ionosphere. We study the dependence of TEC over the contiguous US on various storm parameters, including the onset time of the storm, the duration of the storm, its intensity, and the rate of change of the ring current response. These …
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Characterisation of ionospheric TEC variations over the equatorial and polar regions during solar cycle 24
The TEC variations in the equatorial and polar region are known to be high compared to the mid latitude region. Investigation on ionospheric TEC at individual regions has been carried out by many studies but the investigation between these regions simultaneously is still lacking. TEC values from …
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Peramalan jumlah kandungan elektron menggunakan kaedah suapan ke hadapan rangkaian neural di Semenanjung Malaysia
Total Electron Content (TEC) is one of the physical quantities that can be derived from global positioning system (GPS) data and provides an indication of ionospheric variability. TEC variations have significant effects on radio communications, applications involving navigational systems, GPS …
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Peak Current Mode Driver for Thermoelectric Cooler
Thermoelectric coolers (TECs) are solid state devices that use the Peltier effect to provide heating or cooling for an enclosed area when a voltage is applied. In order to both heat and cool, a bidirectional current must be supplied to the TEC. Therefore, a driver circuit is needed to supply the …
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Evaluation of surface roughness and bond-slip behavior of new textured epoxy-coated reinforcing bars
… proposed a new type of textured epoxy-coated (TEC) reinforcing bars with applied roughness to improve the bond between concrete and steel while providing corrosion protection. This study investigates the surface roughness of different types of TEC bars and how it impacts the bar’s bond-slip …
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Investigation of thermal electric cooler-less microbolometer infrared imaging
… North America use a Thermal Electric Cooler (TEC) to stabilize the Focal Plane Array (FPA). An FPA is an array of microbolometers which are small vanadium oxide elements whose resistances are very sensitive to IR radiation. The ability to run an imaging module without the TEC results in …
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Determination of Thymic Epithelial Cell Composition and Proliferation During The Perinatal to Adult Transition
… types, particularly thymic epithelial cells (TECs). The thymus develops rapidly during the perinatal time period (birth – 10 days in mice) before reaching a period of homeostasis (10 days – 6 weeks). The mechanisms that initially promote and subsequently limit expansion of the TEC compartment …
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Corrosion performance of coated steel bars in cracked and uncracked reinforced concrete beams
Textured epoxy-coated reinforcing bar (TEC) is a material which has gained interest from several Departments of Transportation (DOTs) for its ability to provide enhanced bonding to concrete thereby reducing cracking within transportation bridge deck systems. It aims to improve upon conventional …
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An Investigation of magnetic storm effects on total electron content over South Africa for selected periods in solar cycles 23 and 24
… of regional ionospheric Total Electron Content (TEC) models has contributed to understanding the behavior of ionospheric parameters and the coupling of the ionosphere to space weather activities on both local and global scales. In the past several decades, the International Global Navigation …
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Wnt Secretion Proteins Modulate RANKL-Induced Expression of Aire in Thymic Epithelial Cells
<p>Thymic epithelial cells (TEC) are essential for a proper adaptive immune response by regulating thymocyte development and establishing central tolerance. In the thymus, TECs differentially express Wnt proteins, which activate canonical and non-canonical Wnt signaling pathways. Wnt signaling is …
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Experimental investigation of bridge deck with textured epoxy-coated rebars subjected to thermal loading
… with the incorporation of the epoxy-coating protection system. However, research later demonstrated that the smooth surface resulting from the epoxy-coating application reduces most of the friction between the rebar and the surrounding concrete. Consequently, forces acting on the rib faces are …
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Total Electron Content reconstruction using triple frequency GNSS signals
… proportional to the Total Electron Content (TEC) of the ionosphere. In the last 20 years, several techniques using dual frequency GNSS measurements have been developed to estimate the TEC. With these techniques, systematic errors are confined to at least - 2.5 and 2.5 TECU for a mid-latitude …
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The Co-Volcanic Ionospheric Disturbances at Mt.Etna, Italy
… By this condition the total electron content (TEC) of the ionosphere can be estimated from GNSS data. TEC fluctuations can be related, from above, to space weather dynamics or, from below, to geodynamic events and then GNSS-TEC applications represent an innovative technique to improve the …
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A study of the plasmaspheric electron content using satellites of the global positioning system
… for measuring variations in plasmaspheric TEC. An intrinsic problem with the GPS method is that satellites are neither low-orbiting nor geosynchronous, so that space and time variations are not readily separable. Although the plasmasphere extends over a great height range, an infinitely …
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Analysis & characterization of a flow thermo-electrochemical cell for power generation & heat convection
… testing, results, and applications of this technology. Thermo-electric devices (TE devices) exhibit the thermo-electric effect, where temperature gradients and material properties work in tandem to drive electron transfer at electrode surfaces, thereby generating electricity. For example, a …
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A atuação dos núcleos de apoio às pessoas com necessidades educacionais especiais no IFRN
… at Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Norte (IFRN) through a Professional Education Program in Technology for People with Special Educational Needs (TEC NEP Program). To reach the proposal we opted for an exploratory research with a qualitative approach …
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Phenotypic and functional analysis of the mesenchymal stromal cell compartment in the thymus
… stromal elements. The interaction of cortical (cTEC) and medullary (mTEC) thymic epithelial cells (TEC) with migrating thymocytes is of fundamental importance in driving thymocyte differentiation and their selection towards generation of an immunocompetent but self-tolerant T cell repertoire. …
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