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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 125 for “"Electrical Measurements"”.
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Regularisation methods for imaging from electrical measurements
In Electrical Impedance Tomography the conductivity of an object is estimated from boundary measurements. An array of electrodes is attached to the surface of the object and current stimuli are applied via these electrodes. The resulting voltages are measured. The process of estimating the …
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Extraction of MOSFET doping profiles from device electrical measurements
… Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Fault detection methods for vapor-compression air conditioners using electrical measurements
… method was also experimentally validated with electrical and mechanical measurements on a semi-hermetic compressor. The final diagnostic method detects refrigerant leakage in a residential air conditioning system by identifying changes in the system's cycling behavior. This method also uses …
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Investigation of sub-bandgap absorption in iron pyrite : optical and electrical measurements
… thought, we conduct temperature-dependent electrical measurements on natural and synthetic crystals. Unlike previous measurements on pyrite, our electrical measurements are done in a sulfur atmosphere to avoid FeS formation. Using conductivity data in the intrinsic regime along with …
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A study of oil-film performance between piston rings and cylinder wall by the electrical measurements
The object of this thesis was to investigate some of the factors that night effect the oil film performance between piston rings and cylinder walls. An apparatus was constructed to measure the instantaneous changes in resistance across the oil film. A piston ring of an air-cooled single cylinder …
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Accelerating the development of novel photovoltaic materials
… voltages for both materials. These XPS measurements are then compared to temperature- and illumination-dependent electrical measurements on Cu₂O solar cells to achieve comparable precision and accuracy to spectroscopy in a fraction of the time. Finally, new numerical fitting approaches …
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Investigating Linkages Between Engineering and Petrophysical Properties of Unconsolidated Geomaterials and Their Geoelectrical Parameters
… use of geophysical techniques, especially the electrical resistivity method, in engineering and environmental investigations. The major challenge in the use of electrical resistivity measurements however is the interpretation of the electrical response. This is due to the lack of adequate …
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Electrical Diagnostics for Nanosecond Pulsed Discharge Reactors
… needed to correctly perform and interpret electrical measurements in nanosecond pulsed discharge reactors. The mathematical framework is implemented in a numerical tool called VI-View, which is made available to the community to aid with the interpretation of electrical measurements and …
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Preparations and Characterizations of Tantalum Pentoxide-Titanium Dioxide: Ceramics and Thin Films
… and, most importantly, conditions of hydrolysis. Electrical measurements revealed that amorphous films exhibited the most favorable dielectric properties, with low tandelta = 0.005 and K' = 27.
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Solution-Based Deposition of Ultrathin Metal Oxide Films on Metal and Superconductor Surfaces
… compare the physical properties of these films. Electrical measurements showed that zirconia films on Ag and Au are not insulating, but aluminum-zirconia-aluminum capacitors fabricated by this method displayed capacitance densities between 0.09 tauo 0.50 muF/cm2 (tan delta = 0.09 to 1.12) and …
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Characterization of plasma conductivity by laser Thomson scattering in a high-voltage laser-triggered switch
… Detailed spatially- and temporally- resolved measurements of plasma properties within the switches could contribute to validating and advancing numeric models of these systems by checking the assumptions used in their derivation. To date, there is minimal experimental data detailing the …
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Electrical characterisation of simple a-Si:H and nc-Si devices on paper substrates deposited by hot wire chemical vapour deposition and printing techniques
In this work we report on the electrical transport properties of two classes of silicon: hydrogenated amorphous silicon (a-Si:H) obtained by hot wire chemical vapour deposition (HWCVD), and printed nanocrystalline silicon (nc-Si), both deposited on a flexible, lightweight substrate of 80 g m-2 …
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Complete electrical study of recombination properties of titanium and zinc deep levels in silicon
… samples seem necessary. They permit purely electrical measurements of all relevant band-bound quantum-mechanical transition rates. The data strongly indicate that the dominant energy exchange is through a nonradiative multiphonon mechanism, but the temperature dependence and magnitude of the …
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ΑΖΩΤΟΥΧΑ ΠΑΡΑΓΩΓΑ ΤΟΥ ΤΕΤΡΑΘΕΙΑΦΟΥΛΒΑΛΕΝΙΟΥ ΚΑΙ ΤΕΤΡΑΣΕΛΗΝΑΦΟΥΛΒΑΛΕΝΙΟΥ ΚΑΙ ΑΓΩΓΙΜΑ ΑΛΑΤΑ ΑΥΤΩΝ
… IN EITHER REFLECTANCE OR ABSORPTION MODE. ELECTRICAL MEASUREMENTS ON THE CONDUCTIVE SALTS WERE ALSO PERFORMED. THE RESULTS OF THESE STUDIES HAVE SHOWN THAT ALL OF THESE EXAMINED SALTS ARE SEMICONDUCTORS MAINLY ANISOTROPIC, BUT SOME OF THEM BECOME ALMOST ISOTROPIC AT LOW TEMPERATURES.
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Origins of Enhanced Dielectric Properties in Titania-Modified Tantalum Pentoxide Ceramics
… the first detailed investigation into the electrical properties of TiO2-modified H-Ta2O 5 ceramics. Specimens containing 8% TiO2 exhibited dielectric constant (K) values of ∼280 at 20°C with tan delta values ∼0.01, but undoped specimens had tan delta values of ∼0.10 and DC …
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Studies of Interfacial Phenomena: Alkanethiol Adsorption and Patterning on Gold and the Superconducting Proximity Effect in Superconductor /Semiconductor Systems
… research to overcome difficulties in performing electrical measurements on the high transmittance Nb/InAs interface. Materials processing issues in producing high quality, reproducible Nb/InAs interfaces are discussed, including the effects of passivation, dry etching and metal film deposition. …
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Nature of Large Vesicle Exocytosis in Pancreatic β-cells: Release of ATP and GABA
… electrophysiological techniques such as measurements of cell membrane capacitance and amperometry are used to detect exocytotic events. A novel method was developed in this study based on the expression of P2X2 receptor channel in secreting cells. The presence of ATP sensitive channel on …
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Photo-hall studies of compound semiconductors
… Temperature dependent photo-Hall effect measurements have been made on the high purity compound semiconductors GaAs, InP and a ternary alloy In0 . 53Ga0 . 47As. The major emphasis of this work involves the phenomenon of persistent photoconductivity. This phenomenon has been used to …
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