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 9 of 9 for “"electric impedance"”.
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Acousto-Electric Impedance Of Ferroelectric Phononic Superlattice
The Acousto-Electric Impedance z of a Ferroelectric Phononic Superlattice (fps) is investigated. The analytical derivation of z and its phase reveal that both are functions of physical parameters such as the electromechanical coupling coefficient, the mechanical quality factor, the domain length …
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A malaria diagnostic system based on electric impedance spectroscopy
… diagnostic kit is needed. This work explores electric impedance spectroscopy (EIS) on a microfluidic device as a means of malaria diagnosis. This work introduces a microfabricated probe with microfluidic channel, and a high speed impedance analyzer circuit board. Combination of microfluidic …
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Piezoelectric active sensor and electric impedance approach for structural dynamic measurement
The increasing use of piezoelectric material in the last decade has led to the new discovery that piezoelectric devices may be used not only as sensors or actuators individually, but also as a sensor and actuator at the same time. This bi-directional phenomenon greatly expands the utility of …
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Tissue classification from electric impedance spectroscopy for haptic feedback in minimally invasive surgery
… their patient. This thesis proposes using the electric impedance of tissues, instead of the traditionally used mechanical impedance, to develop haptic feedback for surgical robots. Electric impedance spectroscopy (EIS) and a modified surgical needle were successfully able to measure the …
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Hybrid Inverse Problems Arising from Acousto-Electric Coupling
… that aim to overcome the ill-posedness of the Electric Impedance Tomography using the acousto-electric coupling. For the isotropic case, we consider the problem of reconstructing the internal conductivity of an object by making electric measurements on the boundary while perturbing the …
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Time domain reflectometry (TDR) techniques for the design of distributed sensors
… cables. The TDR equipment sends a high-frequency electric pulse (in the gigahertz range) along the sensing cable. Any change in electric impedance along the cable reflects some portion of the electric pulse back to the TDR equipment. The time delay, amplitude, and shape of the reflected pulse …
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Insights into the mechanisms of wound repair and the role of TP508 in tissue regeneration
… (LPS) and tumor necrosis factor-α (TNF-α). Using electric impedance measurements, it was shown that knockdown of PTP-PEST in HPAEC conferred resistance to barrier disruption, suggesting LPS and TNF-α may activate PTP-PEST. However, subsequent experiments showed that PTP-PEST protein and activity …
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Resonance Tracking and Vibration Stabilisation of Ultrasonic Surgical Instruments
Ultrasonic surgical instruments actuated by piezoelectric transducers are usually driven at relatively high power levels to generate high vibration amplitude at the probe, which interact with biological tissues to achieve the desired effects. In operation, the high power level introduces …