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 33 for “"Current Pulses"”.
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Annealing Cryogenically Irradiated High TemperatureSuperconductors with Current Pulses
… microstructure, decreasing the magnet’s critical current. This lowers the reactor’s achievable magnetic field–and therefore performance. The damage, however, is not necessarily permanent. By applying a short current pulse above the critical current of the coated conductor, resistive heating …
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Control-Oriented Thermal Model for a Hybrid Vehicle Battery
… controller to adjust magnitude of applied current. BMS used in the work is equipped with limited number of temperature sensors that can measure surface temperature of few cells in the battery pack. Additional temper- ature information can be used for better thermal control of the cells in …
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Advanced Faraday cage measurements of charge, short-circuit current and open-circuit voltage
… above atmospheric pressure caused both positive current and negative current pulses with the negative pulse larger than the positive pulse. A pressure decrease of more than 10psi below atmospheric pressure also caused both positive current and negative current pulses with the positive current …
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Detection of antiferromagnetic domain reversal in epitaxial insulating oxides
… These advantages spurred intensive research in current-induced switching of the magnetic order in metallic and insulating antiferromagnets. Insulating antiferromagnetic insulators are promising due to their magnon-mediated long-distance spin transport, THz response, and rich platforms for …
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Development of a wireless current controlled stimulator for individuals with spinal cord injury
… mobility to SCI by applying low level electrical current to the paralyzed muscles so as to enhance that person’s ability to function and live independently. However, due to the limited number of commercially available FES assisted exerciser systems and their rather high cost, the conventional …
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Microcomputer-Controlled Instrumentation for Analytical Conductance Measurements Using the Bipolar-Pulse Technique
… In this method, two square-wave voltage (or current) pulses, which have opposite polarity but equal duration and magnitude, are applied to the conductance cell. The resulting current (or voltage) may be instantaneously sampled at the end of the second pulse, or may be rectified and …
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A system for electrical retinal stimulation for human trials
… The stimulation system delivers charge balanced current pulses to the 100 electrodes in the array. The system has been tested in the laboratory setting as well as in rabbit experiments and one human retinal stimulation trial. It functions as specified, and is very robust.
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A unique electric discharge-excited solid state x-ray laser
A high-current discharge apparatus with a unique pulsed power supply was successfully constructed to demonstrate intense “anomalous” (exceeding direct charged-particle Bremsstrahlung) x-ray emission in the 1-2 keV range. Anomalous x-ray emission is attributed to ion implantation rather than normal …
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A miniature, implantable wireless neural stimulation system
… CMOS process, is capable of delivering biphasic current pulses to 4 addressable electrode sites at 16 selectable current levels ranging from 100[mu]A to mA. Additionally, the biphasic pulses may be inverted. The entire implant weighs less than 1.5g and occupies a footprint smaller than 1.5cm2. A …
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Characterizing the Movement of Contaminant Liquid Metal Particles when subject to Electric Pulses, within the Context of Z-pinch Fusion Reactors
… exposing a eutectic tin-bismuth mixture to high-current pulses. Particle motion was tracked and analyzed using high-speed camera footage processed with advanced techniques, including contrast limited adaptive histogram equalization (CLAHE), neutral-density filtering, and Sobel edge detection. The …
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The Effects of Peltier Marking on Semiconductor Growth in a Magnetic Field
… of dopants and species in the melt after a current pulse with a given duration and strength, with a given magnetic field and with a given crystal-melt interface shape. The first model involves an asymptotic solution to provide physical clarification of the flow. In both models the …
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Ultracapacitor characterization using a novel dynamic parameter identification modeling technique for electric transportation applications
… responses to different charging and discharging current pulses are presented. The simulation responses for varied charging currents are experimentally validated against the actual UC charging results.
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Intrinsic Biophysical Properties of Frog Central Auditory Neurons
… discharge patterns in response to depolarization current injections) as well as morphological phenotypes. The majority of DMN neurons are onset or transient-chopper phenotypes that are capable of encoding rapid time-varying signals. In the third chapter, I showed that TS neurons also display many …
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The Interplay of Spin, Charge, and Heat: From Metal/Insulator Heterostructures to Perovskite Bilayers
… the possible control of magnetic moments using current pulses.</p>
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High performance materials for artificial muscles and energy storage devices
… in their GSM/GPRS modulus to generate high current pulses for signal transmission purposes. The current technologies, such as tantalum/niobium oxide micro-supercapacitors are evolving around enhancing the energy and power density by increasing the specific capacitance and operating voltage. …
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Caracterização de fitas supercondutoras 2G HTS em regime de Flux flow
… such as coils, Superconducting Fault Current Limiters (SFCL) and other cases where the power law applies. This work explores experimental techniques based on the transport method and Four Lead configuration to obtain the N behavior of Second Generation High Temperature Superconductor …
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A superconducting bandpass delta-sigma modulator for direct analog-to-digital conversion of microwave radio
… junctions, natural quantization of voltage pulses, and high circuit sensitivity. Demonstration of a superconducting circuit operating at clock rates in the tens of GHz is often hindered by the difficulty of high speed interfacing with room-temperature test equipment. In this work, a test …
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Characterization of Liquid Metal Free Surface Response to an Electromagnetic Impulse and Implications for Future Nuclear Fusion Devices
… 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 to …
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Verification and Validation of Magnetohydrodynamics Simulations of Electrically Exploded Conductors
… Ohmic heating generated by intense electrical current pulses through an initially solid conductor. Magnetohydrodynamics (MHD) simulations are used to interpret results of these pulsed power systems and design targets for future experiments. Formal testing of the numerical codes is necessary and …
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