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 343 for “"impedance spectroscopy"”.
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Microfluidic Electrical Impedance Spectroscopy
… device capable of measuring changes in impedance valuesof microfluidic cell cultures. Tocharacterize this, an interdigitated array of electrodes was patterned over glass, where it was then bonded to a series of fluidic networks created in PDMS via soft lithography. The device measured …
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Impedance spectroscopy for cellular and biomolecular analysis
… known as ‘Lab On a Chip’ devices.<br/>Impedance spectroscopy is a non-invasive, label-free, analytical technique that is amenable to miniaturization, electronic integration, automation, and scalability within ‘LOC’ devices.<br/>This thesis describes a microfabricated device for …
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Impedance spectroscopy response of aluminum-copper-silicon alloys
… Al-Cu-Si alloys was evaluated. Electrochemical impedance spectroscopy and DC polarization techniques were combined with mechanical property evaluations to determine the relationship between the microstructure of Al-Cu-Si alloys and the ability of their oxide layer to provide protection against …
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Electrochemical Impedance Spectroscopy using adjustable nanometer-gap electrodes
Electrochemical Impedance Spectroscopy (EIS) is a simple yet powerful chemical analysis technique for measuring the electrical permittivity and conductivity of liquids and gases. Presently, the limiting factor for using EIS as a portable chemical detection technology is the lack of absolute …
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Impedance spectroscopy: non-invasive measurements for human tissues characterization
L'abstract è presente nell'allegato / the abstract is in the attachment
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Impedance spectroscopy for the characterization of swine reproductive states
… acquired from a frequency sweeping electrical impedance spectrometer taking readings from sows in order to potentially determine if the resultant data can be used to predict a sow's date of estrus, date of farrowing, and if the inseminated sow has become pregnant. The frequencies analyzed were …
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A malaria diagnostic system based on electric impedance spectroscopy
… 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 device and …
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Electrochemical impedance spectroscopy of proton exchange membrane fuel cell stacks
Electrochemical Impedance Spectroscopy (EIS) is applied to a small, four cell Proton Exchange Membrane (PEM) fuel cell stack to examine the stack response as the load current changes. The measured stack response is compared to a simulated response generated by a stack model that has been developed …
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Linear and Nonlinear Electrochemical Impedance Spectroscopy for Lithium-ion Batteries
… safety, cost, and lifetime. Electrochemical impedance spectroscopy (EIS) is a powerful and widely used technique for noninvasively characterizing many electrochemical systems including lithium-ion batteries; however, the restriction of probing only the linearized physics artificially limits …
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The design of sensor interface circuits for electrochemical impedance spectroscopy
Electrochemical Impedance Spectroscopy (EIS) has gained attention in biomedical applications—such as DNA, antigen–antibody, and virus detection—due to its label-free nature and high sensitivity. The development of EIS circuits with low power consumption, reduced complexity, and faster measurement …
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Fluid Characterisation Using Microfluidic Impedance Spectroscopy for Remote Health Monitoring
… are available on the market. In contrast, impedance spectroscopy is capable of directly probing the electrical properties of the fluid, removing the intermediate steps inherent in colorimetric and electrochemical methods. In this work, a microfluidic device is proposed with integrated …
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Electrochemical impedance spectroscopy options for proton exchange membrane fuel cell diagnostics
Electrochemical impedance spectroscopy (EIS) has been exploited as a rich source of Proton Exchange Membrane Fuel Cell (PEMFC) diagnostic information for many years. Several investigators have characterized different failure modes for PEMFCs using EIS and it now remains to determine how this …
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Electrochemical impedance spectroscopy and surface plasmon resonance for diagnostic antibody detection
… detection, in particular Electrochemical Impedance Spectroscopy (EIS), have been shown viable for detection of lower affinity antibodies, based on the principle that these technologies allow the measurement of antibody binding to immobilized antigen, i.e. without the need to wash away …
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Development of Multifunctional Electrical Impedance Spectroscopy System for Characterization in Plant Phenotyping
… nutrients and water contents by obtaining the spectroscopy data is essential for plant characterization, and photosynthesis. The conventional optical methods like visible/near-infrared spectroscopy, hyperspectral or multispectral imaging, and optical tomography have been developed and studied …
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Impedance spectroscopy techniques for condition monitoring of polymer electrolyte membrane fuel cells
… at improving the popular Electrochemical Impedance Spectroscopy (EIS) are presented. Conventional EIS takes significant amount of time, rendering it unsuitable for real-time diagnostics. Multi-frequency perturbation signals have been proposed to address this challenge. These however …
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Using electrochemical impedance spectroscopy to characterize vertically-aligned carbon nanotube forest porosimetry
… is needed. This method explores the use of impedance spectroscopy and other electrochemical methods to characterize VA-CNTs in situ. VA-CNTs forests were grown via chemical vapor densification on pre-oxidized silicon wafers, mechanically densified to achieve varying volume fractions (1%, 2%, …
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Tissue classification from electric impedance spectroscopy for haptic feedback in minimally invasive surgery
… 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 electric …
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Implementing Electrochemical Impedance Spectroscopy for the In Situ Analysis Of Conducting-Membrane Fouling
… technique known as electrochemical impedance spectroscopy (EIS). EIS is a non-destructive electrical perturbative method, thus it can be performed during filtration. While some research groups have applied EIS for membrane characterization, none have yet incorporated conductive …
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Electrical Impedance Spectroscopy with Multi-modal Tissue Discrimination for Ultrasound-Guided Targeted Biopsy
… instrumented needle probe that uses electrical impedance spectroscopy to identify tissue at the needle tip in real-time, validated on an ex-vivo tissue dataset. Two data augmentation methods are proposed for improving classifiers trained on small datasets. Lastly, the thesis shows the ultrasonic …
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Design and Implementation of A Three-Level Boost converter for Battery Impedance Spectroscopy
… in this research is known as the Electrochemical Impedance Spectroscopy (EIS). The EIS is a widely known technique used in determining the internal impedance of a battery cell. The estimated impedance can be used to determine the state of charge (Soc) and State of health (SoH) of a battery. The …
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