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 1872 for “"Impedance"”.
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Development of an electrical impedance tomograph for complex impedance imaging
… project concerns the development of electrical impedance tomography towards the production of complex impedance images. The prime intention was to investigate the feasibility of developing suitable instrumentation; but not clinical applications. It was aimed to develop techniques for the …
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Micro-impedance cytometry
Electrical impedance spectroscopy is a non-invasive and label free technique that allows for rapid counting and characterisation of particles in suspension based on their response to applied AC potentials. In recent years, lab-on-a-chip technologies have been developed to enable single-cell …
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A High-Resolution Microscopic Electrical Impedance Imaging Modality: Scanning Impedance Imaging
Electrical impedance imaging is an imaging technique which has the capability of revealing the spatial distribution of the electrical impedance inside biological tissues. Classical electrical impedance imaging including Electrical Impedance Tomography (EIT) typically has low resolution. Advances in …
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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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Heterogeneously Integrated Impedance Based Biosensors
… electrodes, was applied to measure the impedance of suspended DNA at different concentrations. The measurement showed a double sensitivity compared to the one carried out on the CMOS platform only. The noise analysis of CMOS transimpedance amplifiers was performed, and the impact of …
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The limits of Brune's impedance
"The impedance concept as popularized by Oliver Heaviside in the 1880s may be used to model physical systems that may or may not include wave propagation. Otto Brune in 1931 coined the term and then provided a proof that ``positive real"" is a necessary and sufficient condition for network …
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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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Impedance transformation using lossless networks
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1960.
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Nonlinear force feedback impedance control
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1986.
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Directional impedance of geared transmissions
… is desired. In this paper we present directional impedance, a characteristic of geared transmissions in which the amount of power loss through the transmission differs according to the direction of power flow. Typical robots use electric motors with high gear reduction which introduces larger …
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Implementing Impedance - Based Health Monitoring
This work is an experimental study of applying an impedance-based health monitoring technique to complex structures. The work is presented in three parts. In the first part we consider effects of the following three factors on damage detection abilities: actuator excitation level, test wire length …
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Tensorial Impedance Surfaces for Manipulating Microwaves
… conditions are often described with a "surface impedance". Tensorial impedance metasurfaces are surfaces where, due to anisotropy, the impedance becomes a 2nd rank tensor. This results in a boundary condition that has greater control over the surface fields than scalar impedance boundaries. Most …
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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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Microwave Impedance Microscopy Of Nanostructured Carbon
Microwave impedance microscopy (MIM) is a scanning probe technique that measures local changes in tip-sample admittance. The imaginary part of the reported change is calibrated with finite element simulations and physical measurements of a standard capacitive sample, and thereafter the output ∆Y is …
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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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Antenna Impedance in a Warm Plasma
Made available in DSpace on 2014-12-08T22:24:09Z (GMT). No. of bitstreams: 1 6711830.pdf: 2560377 bytes, checksum: 3a20a137dcb8aa235b7104de56835c1d (MD5) Previous issue date: 1967
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