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 21 for “"Voltage response"”.
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Modeling of pCO2 Point-of-Care Devices
… is developed and presented that predicts the voltage response for a Severinghaus electrode-based point-of-care pCO2 sensor. Eight partial differential equations are derived to describe the diffusion and reaction phenomena in the sensor. The model is able to predict the potential response …
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Ferroelectric Barium Titanate Nanowires: Synthesis, Properties, and Device Applications
… In this device, due to the piezoelectric effect, voltage response was generated from the BaTiO3 nanowire by a periodically varying tensile mechanical strain applied with a precision mechanical testing stage. The measured voltage generation from the nanowire was found to be directly proportional to …
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Mechanical and electrical characterization of carbon Black-doped closed-cell Polydimethylsiloxane (PDMS) foam
… mechanical pressure patterns were applied and voltage response measured. An optimum dopant weight percent out of the concentrations tested was found at 5.5 wt% CB-PDMS.
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Roles of gap junctions in neuronal networks
… junctionally coupled cables to understand the voltage response along the cables as a function of cable diameter. For the coupled cables, as cable diameter increases, the electrotonic distance decreases, which cause the voltage to attenuate less, but the input of the second cable decreases, …
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Al-Ga Sacrificial Anodes: Understanding Performance via Simulation and Modification of Alloy Segregation
… to a 168 hour long galvanostatic test to assess voltage response. The corrosion performance of samples was found to have both consistent and optimal voltage range when subjected to quick cooling rates followed by annealing. Testing samples at near freezing temperature seems to completely remove …
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Design and Implementation of A Three-Level Boost converter for Battery Impedance Spectroscopy
… at different frequencies and measuring the voltage response. A standard Frequency Response Analyser (FRA) is used as an offline test while the battery is disconnected from the Load. The limitation of this standard FRA analyser is that it is bulky and Expensive. Attempts have been made to …
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Determination of Frequency-Based Switch Triggers for Optimal Vibration Reduction via Resonance Frequency Detuning
… to avoid this resonance crossing and limit the response. The peak response dynamics are then determined by the system*s sweep rate, modal damping ratio, electromechanical coupling coefficient, and, most importantly, the trigger (represented here in terms of excitation frequency) that initiates …
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Sensors for thermal conductivity at high temperatures
… consisted of the experimental measurement of the voltage response of a sensor and a subsequent inverse Unite element analysis, has been significantly upgraded.<br/><br/>The experimental part of the technique has been improved by the introduction of a new design of the sensor for the measurement of …
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The initiation of action potentials and the passive electrical properties of identified snail neurones
… by measuring the harmonic content of the voltage response to a sinusoidal current input. The model so deduced accounted for the response of neurones for inputs with peak-to-peak amplitudes up to 2 nA, but the form of the input showed a strong dependence on the DC bias of the input. In the …
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Online condition monitoring of lithium ion batteries by performing impedance spectroscopy using a DC-DC converter
… frequencies into the battery and measuring the voltage response. This technique is conventionally implemented, using standard Frequency Response Analysers (FRA), while the battery is disconnected from the load (offline) due to the long procedural times involved. This has limited the use of EIS …
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Load Learning and Topology Optimization for Power Networks
… resources (DERs), electric vehicles, and demand-response programs, grid operators are in dire need of new monitoring and design tools that help improve efficiency, reliability, and stability of modern power networks. To this end, the work in this thesis explores a generalized modeling and …
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Electromechanical Modeling of Piezoelectric Energy Harvesters
… piezoceramic layers that generate alternating voltage output due to base excitation. This work presents distributed-parameter electromechanical models that can accurately predict the coupled dynamics of piezoelectric energy harvesters. First the issues in the existing models are addressed and …
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Noninvasive Assessment of Joint Motion Over Long Durations: System Evaluation and Data Analysis Methods
… required more research to properly translate the voltage response of the electrogoniometer into shoulder position. To clearly correlate human shoulder movement and sensor response, an experiment was conducted with ten known regions of angular deviation within a range of 0° to 90° flexion and 0° to …
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A Purkinje cell Timing Mechanism. On the Physical Basis of a Temporal Duration Memory.
… precisely timed activity patterns. Learned response timing is indispensable for a wide range of tasks and requires learning of interstimulus intervals (ISIs). The learning mechanism thought to accomplish this combines time-varying patterns of activity in the pre-synaptic neural network with …
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Study of thin metal films and oxide materials for nanoelectronics applications
… diagram, which is obtained from the current-voltage response of the copper oxides, is presented. In the case of thin nickel films, the necessary reagents, conditions and processes required to obtain nano and atomic gaps between soft and clean nickel electrodes are described by using a …
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Novel contrasts in photoacoustic tomography
… and in vivo neural activity imaging with voltage/calcium-sensitive indicators.</p><p>Specifically, Chapter 1 introduces photoacoustic microscopy (PAM) and photoacoustic computed tomography (PACT) systems and discuss the motivation of the dissertation.</p><p>Chapter 2 describes two …
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An Exploration of Nonlinear Locally Resonant Metamaterials with Electromechanical and Topological elements
… demonstrating their use in tuning the system response. It is also shown that nonlinear phenomena such as localized solitons and frequency shift are present in the voltage response of the electromechanical metamaterial. Next, a nonlinear metamaterial with local resonators and quasiperiodicity …
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Feedback Control of Ionic Polymer Actuators
… large deformation in the presence of low applied voltage across its thickness and exhibits low impedance. They can also be used as large displacement sensors by bending them to induce stresses and generate a voltage response. They operate best in a humid environment. Ionic polymer actuators have …
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Effect of wall motion on a two-dimensional turbulent boundary layer
… axis at a particular distance from the wall. The voltage response of this probe shows a minimum value (corresponding to the lowest cooling velocity) at the angular position which corresponds to the direction of the absolute velocity. Therefore, in the freestream, this minimum occurs at zero degree …
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Evaluation of process parameters and membranes for SO2 electrolysis
… that, depending on the desired operating voltage and acid concentration, the optimisation of the operating conditions was critical. An increased cell temperature promoted both cell voltage and acid concentration while the use of thin membranes resulted in a reduced voltage and acid …
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