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 52 for “"High voltages"”.
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Electrokinetic pumping of semi-insulating liquids by traveling wave high voltages
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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Changes in the cation ordering of layered O3 Lix̳Ni₀.₅Mn₀.₅O₂ during electrochemical cycling to high voltages
Selected area electron diffraction patterns were collected from a pristine LiNi₀.₅Mn₀.₅O₂ sample and cycled Lix̳Ni₀.₅Mn₀.₅O₂ samples to 4.5 V and 5.3 V in the charged and discharged states. In the pristine sample, the single-crystal diffraction patterns clearly revealed superlattice reflections …
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Trap modelling and injection effects in GaN power devices
… promising candidates for the next generation of high efficiency power semiconductor devices. Their material and device properties enable power conversion systems that are potentially smaller, lighter, less complex, cheaper and more efficient than silicon based solutions. While GaN-based HEMTs are …
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Electrode materials for the electrolysis of metal oxides
… cell. The materials were pre-selected to endure high process temperatures and were characterized for inertness and high current density during electrolysis using voltammometric techniques. Inertness is viewable through current discrepancies dependent on voltage scan direction at low voltage, …
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Bias Temperature Instability Modelling and Lifetime Prediction on Nano-scale MOSFETs
… is ten years, accelerated BTI tests under high stress voltages are mandatory. BTI modelling is needed to project BTI lifetime from high voltages (accelerated condition) to operating voltage. The existing two mainstream BTI models: 1). The Reaction-Diffusion (R-D) framework and 2). The …
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Electroforming and electron emission in metal-borosilicate glass-metal structures
… in borosilicate glasses is found to be very high, in particular for devices which carry aluminium electrodes in comparison to those carry silver, copper or gold electrodes. Breakdown depends on both the electrode and insulating materials and on the insulator thickness. Since the circulating …
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Enabling miniaturized grid-interface power conversion
… reliance on magnetic components, relatively high voltages for application of emerging GaN transistors, wide range of operating voltages and powers, and a twice-line-frequency energy storage component that is difficult to miniaturize. This thesis will present a high-frequency inductor …
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High-Efficiency Soft-Switched Pulsed Plasma Bias Supply System
… waveforms is challenging due to the need for high voltages (kilovolt range), high frequencies (hundreds of kilohertz to low megahertz), precise timing, and broadband frequency content. Traditional methods to generate these waveforms are limited by semiconductor voltage ratings, leading to …
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Epitaxial Gallium Oxide Heterojunctions for Vertical Power Rectifiers
… while instantaneously switching to withstand high voltages in the off-state. For decades silicon (Si) has dominated nearly all aspects of electronic systems including power. As importunity for efficiency at higher power and fast switching speeds grows, the environments with which these systems …
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Fabrication and application of a novel four-terminal hybrid organic/inorganic field-effect transistor for volatile organic compounds sensing
… circuits. However, OTFTs still operate at high voltages and lack sensitivity. This thesis will present the OTFT with patterned gate, which will eliminate the restrictions common OTFTs face. With this approach increased sensing responses are achieved. Furthermore, the sensor can be operated …
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Compatibility of hydrophobic ionic liquids with high performance cathode materials for lithium ion batteries
… cathode materials that incorporate lithium at higher capacities and voltages. This increases the energy and power available from an individual electrochemical cell, which reduces the number of cells required thereby reducing the size of a battery pack. While several high voltage cathode …
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The development of nanofluidic platforms for biomolecular separations
… large laboratory footprints, require high voltages to operate (in the tens of kilovolts), and call for relatively large sample sizes in order to perform these tasks. All of these shortcomings can be addressed by performing these separations and purifications in smaller, nanofluidic …
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Design of, and initial experiments with, a MIMO plate control testbed
… The sensors measure plate positions using a high impedance signal conditioning amplifier. The sixteen-channel design implements a band-pass filter to eliminate low- and high-frequency noise. The power amplification scheme chosen for the actuators uses low-gain amplifiers (~2.5 V/V) in series …
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Characterization and mitigation of process variation in digital circuits and systems
… within-die component of variation is small at high voltages but is an increasing fraction of the total variation as power-supply voltage decreases. Once again, the data shows no evidence of within-die spatial correlation and only weak systematic components. Evaluation of adaptive body-biasing …
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On single-molecule DNA sequencing with atomic force microscopy using functionalized carbon nanotube probes
… carbon nanotubes is presented utilizing high voltages to remove material. Measuring the length of the nanotube is performed with a novel technique that exploits the nanotube's unique elastic buckling property.
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High-Frequency Electronics for Contactless Dielectrophoresis
… This work presents two methods for providing the high-voltage and high-frequency signal necessary to generate a non-uniform electric field in the sample channel of a cDEP device. The first method, an oscillator-based system, was able to produce DEP trapping and pearl-chaining of THP-1 and MCF-7 …
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Impedance characteristics and grain boundary effects in titanate-based multilayer ceramic capacitors
… ceramic capacitors are both ohmic at low voltages and super-ohmic at intermediate voltages. Ohmic behavior prevails at high voltages for both types. Such behavior can be attributed to grain boundaries. Grain boundary resistance was clearly exhibited by X7R-type density blanks and one …
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Adaptive digital distance protection for series compensated transmission lines
… capacitors to prevent the development of very high voltages across the capacitor which could cause excessive damage to the equipment. The work presented herein describes a new digital distance relay suitable for series compensated line applications. The errors in the impedance measurement for a …
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