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 44 for “"High current density"”.
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High Frequency, High Current Density Voltage Regulators
… microprocessors. The design challenges are the high current, high di/dt, and stringent load-line requirement. When the energy is transferred from the input of a VRM, through the VRM, then through the power delivery path to the processor, it needs sufficient capacitors to relay this energy. The …
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Production of High Current Density Ion Beams by Electrohydrodynamic Spraying Techniques
Made available in DSpace on 2014-12-08T22:24:43Z (GMT). No. of bitstreams: 1 7000997.pdf: 3111626 bytes, checksum: 45f52037ff940722e80edba2d6779213 (MD5) Previous issue date: 1969
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Wear of high speed, high current density slip ring materials at elevated temperatures
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1981.
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Hierarchical electromigration reliability diagnosis for ULSI interconnects
… when a metallic interconnect is stressed under high current density. In recent years, the line width of ULSI interconnects has been shrunk into the submicron regime. This gives rise to serious concerns about electromigration-induced failures.
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Highly scaled silicon field emitter arrays with integrated silicon nanowire current limiters
… tall, 200-nm diameter silicon nanowire limits current and improves reliability through velocity saturation and the pinch-off of majority carriers. The 2-[mu]m thick SiO₂ insulator between the gate and the substrate and the conformal dielectric matrix that embeds the nanowire current limiters …
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ENHANCEMENT OF SATURATION BOILING OF PF-5060 DIELECTRIC LIQUID ON MICROPOROUS SURFACES
… of the results to immersion cooling of high power computer chips. MPC surfaces of different thicknesses (80—230 \uf06dm), fabricated using conventional electrochemical deposition at high current density, have different morphology and microstructure. The PF-5060 liquid is chemically …
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Computational fluid dynamics modelling of PEM fuel cells to investigate transport limitations.
… layers to predict cell voltage at an average current density. The average current density and net water transfer coefficient, used to calculate the source terms, were calculated using auxiliary equations and linked to the solver through UDFs. Parametric studies were performed to determine the …
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Electrical Impedance Tomography (EIT): The Establishment of a Dual Current Stimulation EIT System for Improved Image Quality
… investigates and confirms the use of a dual current stimulation EIT (DCS EIT) system. The results of this investigation presented a size error of 2.82 % and a position error of 5.93 % in the reconstructed images, when compared to the actual size and position of the anomaly inside a test …
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Fabrication and Characterization of Aluminum Nano-Carbon Composites and Investigation of Their Electrical Conductivity
… to the base metal alloy. In this method, a DC current is applied to molten Al metal containing activated carbon particles in an enclosed inert environment. The high current density first facilitates ionization of the carbon atoms and migration of the carbon ions similar to “electromigration in …
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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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Pulsed-Power Busbar Design for High-Powered Applications
The use of high-powered electrical energy systems requires an efficient and capable means to move electrical energy from one location to another while reducing energy losses. This paper describes the design and construction process of a high-powered busbar system that is to be implemented in …
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Titanium nitride as an electrode material for high charge density applications
… day neural prostheses require electrodes with high current densities. Traditional electrodes are not capable of delivering such high current densities. Titanium nitride as an electrode material and other techniques like reactive ion etching, platinization of titanium were studied in this thesis …
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Modeling of solid oxide fuel cells
… their performance. We review and compare the current modeling methodologies, and develop an one-dimensional MEA model based on a comprehensive approach that include the dusty-gas model (DGM) for gas transport in the porous electrodes, the detailed heterogeneous elementary reaction kinetics for …
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The Design of an Asic Control Chip for a Forward Active Clamp Converter and the Investigation of Integratable Lateral Power Devices
… and drive circuit into one IC chip results in higher power density, higher reliability for the converter module. The designed ASIC control chip uses a 2.0 um N well Analog CMOS process, and is fabricated at MOSIS. The design procedures of the ASIC chip are explained, and experimental results …
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Simulation and design of a hydrogen arcjet thruster seeded with cesium
… or ionization. When the flow passes through the high current density region of the anode arc attachment, the hydrogen was found to not ionize as previously feared even when run at comparatively high currents. The cesium is fairly uniformly spread throughout the constrictor, as is the current …
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Submicron Scaling of Indium Phosphide/indium Gallium Arsenide Heterojunction Bipolar Transistors Toward Terahertz Bandwidths
… focusing on junction temperatures of high current density SHBTs. A novel method for determining the thermal resistance of an HBT is presented, correcting the considerable error obtained by classical theoretical predictions. The relationships between junction temperature and cutoff …
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Mechanism and assessment of spin transfer torque (STT) based memory
When a sufficient current density passes through the MTJ, the spin-polarized current will exert a spin transfer torque to switch the magnetization of the free layer. This is the fundamental of the novel write mechanism in STT-RAM, current-induced magnetization switching. It allows STT-RAM to have a …
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Modeling of electrical behavior of graphene-based ultracapacitors
… material for energy storage, especially for high performance ultracapacitors. Graphene-based ultracapacitors show high stability, significantly-improved capacitance and energy density with fast charging and discharging time at a high current density, due to enhanced ionic electrolyte …
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Feature scaling of large, ballasted, field emission arrays
Field emitters are an exciting technology for high-frequency, high-power applications because of their excellent free space electron transport, and their potential for high current density and high current, especially when they are used in an array format. However, a major challenge preventing the …
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Electrical Insulation for High Temperature Superconducting Power Cables for Electric Transport Systems
… techniques being researched and developed. The high power demands of the power systems of transport platforms need high power density, energy efficiency, and resiliency. High-temperature superconducting (HTS) power cables are a viable solution to meet the ambitious goals. HTS power cables offer …
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