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 64 for “"impedance measurements"”.
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Cable Noise in Impedance Measurements
… thesis focuses on the analysis of cable noise in impedance measurements. Specifically, the focus is on cables being developed for embedded sensing applications. In many applications, such as torque sensing and embedded fatigue and corrosion sensing, it is not feasible to have the probe electronics …
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Electrical impedance measurements of the uterine cervix in pregnancy
This is the first time that electrical impedance studies have been performed on the pregnant cervix.In this thesis the following has been demonstrated:1. An inter-observer variability in resistivity readings, initially of the order of 20%, but decreasing to 1% once proficiency with the technique …
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Single Cell Impedance Measurements Using Microfabricated Electrodes and Labview Graphical Programming
… of a system that could perform broadband impedance measurements (1kHz-20Mhz) of single cells using National Instruments Labview data acquisition and programming in coordination with a single cell capture device. Presented first is the background information on cells and their electrical …
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Impedance measurements at W-band using an array of bismuth microbolometers
… placed over the CPW. From this information, the impedance of the load at the end of the line can be determined in addition to the propagation and attenuation constant of the CPW.
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The effect of premenstrual edema on percent body fat measurements utilizing bioelectrical impedance
… of premenstrual edema (water retention) on measurements of percent body fat (%BF) in ovulating women during the menstrual cycle utilizing bioelectrical impedance. Specifically, this study was designed to investigate the difference between bioelectrical impedance measurements of %BF recorded …
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Temperature Compensation Improvements for Impedance Based Structural Health Monitoring
… life and performance of engineering structures. Impedance-Based SHM utilizes the coupled electromechanical behavior of piezoelectric materials to detect adverse changes and material and mechanical failures of structures. Environmental variables such as temperature present a challenge to assessing …
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DNA detection system of homo-oligomers by electrochemical impedence measurements and quantification through radiolabeling
A system based on electrical impedance measurements using chemically modified Silicon/Silicon dioxide electrodes with covalently bound single stranded homo-oligonucleotides was developed for DNA detection. Silanating agents (3-aminopropyltriethoxysilane, 3-glycodoxyethylpropylamine) were used to …
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Examining the Effects of Applied Potential on the Surface Charge of Functionalized Monolayers for Site-Directed Ionic Self Assembly
… that can be monitored with electrochemical impedance measurements. Impedance measurements provide a qualitative assessment of the degree of potential-driven polyelectrolyte self assembly. The electrostatic interactions between the redox probe in solution and the terminal region of monolayers …
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Development of a Self-Sensing and Self-Healing Bolted Joint
… In order to detect looseness in a joint the impedance health monitoring method is used. A new method of making impedance measurements for health monitoring that greatly reduces the equipment cost and equipment size was developed. This facilitates implementation of the impedance technique in …
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Rot detection in wooden poles using electrical impedance tomography
… chosen for this project was that of electrical impedance tomography in which an image of the permittivity in a cross section would be created from impedance measurements made between electrodes attached to the boundary of the pole.
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Impedance Changes in Biceps Brachii Due to Isometric Contractions and Muscle Fatigue Using Electrical Impedance Myography (EIM)
<p>Electrical impedance myography (EIM) is a non-invasive technique used to evaluate neuromuscular conditions by using a quantitative parameter called impedance (Z). It relies upon the application and measurement of high-frequency, low-intensity electrical current imbedded over a localized muscle …
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Development of a novel probe integrated with a micro-structured impedance sensor for the detection of breast cancer
… focuses on the development of an innovative bioimpedance device for the detection of breast cancer using electrical impedance as the detection method. The ability for clinicians to detect and treat cancerous lesions as early as possible results in improved patient outcomes and can reduce the …
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Impedance-Based Detection of Tissue Using a Multi-Electrode Device
… from biopsies that turn out to be benign. Thus, impedance-based detection using a multi-electrode device was investigated as a noninvasive technique to diagnose melanoma skin cancer. The multi-electrode device was designed with 8 equally spaced Ag/AgCl electrodes surrounding one central electrode …
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Electrical impedance of methane flat flame
… work was undertaken to determine if electrical impedance measurements of the flame are a direct indication of fuel/air ratio. Previous worked measured electrical resistance of the combustion of gases in an atmospheric combustor. From this work, it was conjectured that the complex impedance might …
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Investigation of Reactive Electrokinetic Processes for Permeability Reduction in Hardened Cement Paste
… of magnitude. It was observed that the system impedance provided an indication of the permeability-reduction effectiveness of a given process. A transport model was developed to determine the viability of a given treatment candidate. This model predicted the extent of penetration achievable by …
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UHF RFID Antenna Impedance Matching Techniques
… range is maximized when a tag antenna’s input impedance is conjugate matched to the RFIC input impedance. Since RFIC input impedance includes capacitive reactance, optimized antenna input impedance includes compensating inductive reactance.</p> <p>The T-match network adds inductive matching …
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SMALL SIGNAL STABILITY ANALYSIS OF THREE-PHASE MICROGRID SYSTEM IN THE PRESENCE OF CONSTANT POWER LOADS
… and cause instability issues in the system. An impedance-based method is preferable for the stability analysis of such systems in real-time. Perturbation methods can be used to determine system impedance. The perturbation approach involves injecting various perturbation signals into the system …
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Effects of temperature on the electrical impedance of piezoelectric elements
… (PZT) materials for tracking the structural impedance to qualitatively identify damage. The mechanical impedance of a structure is a function of the structure's mass, stiffness, damping, and structural boundary conditions. Changes in any of the above-mentioned properties lead to a change in …
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Yeast-based impedance biodosimetry for retrospective assessment of radiation exposures
… exposures following radiological accidents using impedance biodosimetry. The radiation response of S. cerevisiae was examined by using cellular metabolic activity and impedance as a means to evaluate dose. A novel dosimeter design was developed to allow impedance measurements to be performed on …
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