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 24 for “"large current"”.
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Simulating Real-World Human Activities with VirtualCity: A Large-Scale Embodied Environment for 2D, 3D, and Language-Driven Tasks
… that the sim2real gap for tasks isn’t too large. Current embodied environments focus mainly on small-scale or low-level tasks, without the capability to learn large-scale diverse tasks, and often lack the realism for a small sim2real gap. To address the shortcomings of current simulators, …
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Carbon nanotubes as interconnect for next generation network on chip
… frequency, energy consumption and chip size are largely determined by these interconnects. According to the International Technology Roadmap for Semiconductors (ITRS), in the next five years up to 80% of microprocessor power will be consumed by interconnects. In the sub 100nm scaling range, …
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Design Concepts for High-Acceleration Linear Actuators for Precision Motion
… However, the improved performance may demand large current densities that are unsustainable in terms of the associated power dissipation generated by ohmic losses in the copper coils. In this thesis, we continued a previous study conducted in our lab that explored the use of mechanical contact …
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Characterization of Liquid Metal Free Surface Response to an Electromagnetic Impulse and Implications for Future Nuclear Fusion Devices
… such as in z-pinch devices, PFCs are subject to large current and magnetic flux densities resulting in large Lorentz forces. Furthermore, if the PFCs are LM, the forces excite wave behavior that has not previously been investigated. The work presented here first characterizes the response of LMs …
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Current steering and electrode spanning with partial tripolar stimulation mode in cochlear implants
… the small number of implanted electrodes and the large current spread of electric stimulation. Although current spread may be reduced using partial tripolar (pTP) stimulation mode, the number of electrodes may not be sufficient to preserve fine spectral details. Here, we propose to introduce …
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Variable Ratio Matrix Transformer based LLC Converter for Two-Stage Low-Voltage DC-DC Converter Efficiency Improvement
… (1) wide regulation range; (2) high output current; (3) thermal management. The single stage solutions, such as phase-shift full-bridge converter and LLC resonant converter, have been widely studied in the past. A matrix transformer is widely adopted in single-stage LDC design to deal with …
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Pistolová páječka s napájením z baterií Li-Ion
Tato diplomová práce se zabývá návrhem bateriově napájené páječky. Páječka bude umístěna v plastové krabičce z klasické transformátorové páječky. Nejprve je potřeba zjistit parametry původní páječky. Poté budou navrženy synchronní snižující měnič, řízení měniče, obvody BMS a rozmístění komponent v …
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Characteristics of different focusing antennas in the near field region
… region is presented. The performance of the large focused array antennas is predicted based on the knowledge of the mutual admittances of a smaller array. The effects of various focal distances on the near field pattern of these antennas are investigated. Then, electric field pattern …
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Optical Enhancement in Periodic Plasmonic Gratings for SERS and Metal-Semiconductor-Metal Photodetectors (MSM-PDs) Applications
… introduces a new method, which incorporates the current density of the device when calculating the overall current enhancement in order to model real performance more accurately. Using this method indicates that since plasmonic hot spots align well with areas of large current density, the optical …
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Design and fabrication of electromagnetic micro-relays using the UV-LIGA technique
… the post-exposure bake process that eliminates large plastic deformations present during standard bake procedures. Another challenging issue associated with producing high aspect ratio microstructures is the development narrow groves and deep holes in SU-8 lithography. To overcome this obstacle, …
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Impacts of trace metal pollution, urbanization and aquifer recharge on Spokane River macroinvertebrates
… to address differences between reaches. With a large current investment in restoring the Spokane River, repeating this bioassessment could be an effective tool to address the ecosystem health of the river and effectiveness of restoration practices, particularly if the number of sampling sites …
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Low Energy Order-To-Disorder Transition Pathways In Phase-Change Nanowires
… the pulse. However, such a method requires very large current densities, which results in massive parasitic heat losses and also accelerated failure of the device. On the other hand, it has been recently shown that resistance switching in PCM systems such as superlattices and nanowires can occur …
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Performance Improvements of Multi-Channel Interleaving Voltage Regulator Modules with Integrated Coupling Inductors
… equal transient responses. For the inductances larger than the critical inductance, the VRM transient voltage spikes increase with the inductance. The critical inductance is the largest inductance that gives the fastest transient responses. The critical inductance is a function of the control …
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Cryogenic heat pipe for cooling high temperature superconductors with application to Electromagnetic Formation Flight Satellites
… Formation Flight (EMFF). In order to create a large magnetic field necessary for actuating formation flying spacecraft, EMFF uses high temperature superconducting (HTS) wire since it is able to carry a large current at low power. To achieve superconductivity, the HTS wire needs a cryogenic …
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Renewable energy supply and storage: liquid metal battery stability
… batteries (LMBs) offer a new opportunity for large-scale electrical energy storage. The three liquid layer self-segregated structure of the battery provides a number of advantages in comparison to classical batteries: fast kinetics, long lifetime, large current densities, easy recycling. …
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Control of Pseudo-Sinusoidal Switched Reluctance Motor with Zero Torque Ripple and Damped Input Current Ripple
… ruggedness. However, the torque ripple and bus current ripple of SRM restrict its application range compared with traditional AC and DC motors due to the doubly salient pole structure and the highly non-linear coupling between torque, rotor position and phase current. As a result of the torque …
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Organic semiconductor lasers with two-dimensional distributed feedback
… molecular system Alq3:DCM. Owing to their large gain coefficient low-threshold light-amplification by stimulated emission can be observed from slab waveguides formed by a thin layer of the OS on a planar substrate. In periodically modulated waveguides Bragg scattering gives rise to …
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Development of a ferroelectric plasma source through material degradation studies and characterization of volume and surface discharges
… polarizable material, capable of generating large surface currents (10^0 – 10^5 A/cm2), is pulsed to emit electrons and ions. The ferroelectric material uniquely affects emission, which in turn uniquely affects the ferroelectric surface. Lifetimes are typically limited to 10^4 to 10^5 …
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Macro-Fiber Composites for Sensing, Actuation and Power Generation
… It was found that the MFC produces a very low current, making it less efficient than the PZT material and unable to charge batteries because of their need for relatively large current. Due to the MFC being incapable of charging batteries, only the PZT was used to charge batteries and the charge …
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Novel Lateral MOS Controlled Power Devices and Technologies for Power Integrated Circuits
… integrated circuit or system, can provide a large current carrying capability, high blocking voltage, fast switching speed, small area of occupation. However, conventional lateral MOS power devices, especially the devices with the operation of the conductivity modulation mode, have to be …
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