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 12 of 12 for “"microwave measurement"”.
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Online microwave measurement of complex dielectric constant
This dissertation examines the problem of on-line measurement of complex dielectric constant for the purpose of dielectric discrimination or product evaluation using microwave techniques. Various methods of signal/sample interaction were studied and consideration was given to the problem of sorting …
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Simulation and microwave measurement of the conductivity of carbon nanotubes
… is to induce current in the nanotubes using microwave energy. A resonator-based measurement method is used to examine the electrical properties of the nanotubes. Remarkably, the nanotubes appear to have the smallest sheet resistance of any non-superconducting material. The possibility of a …
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An investigation of minerals using microwave measurement of complex permittivity
Microwave measurement techniques have found many industrial and commercial applications. This measurement potential of microwaves, together with observations that different minerals show different microwave heating characteristics, suggests the possibility of applying microwave techniques to …
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Microwave data reduction technique for calculation of solid propellant burning rates
A microwave measurement system for obtaining continuous burning-rate information from a solid propellant slab-burning rocket motor is described. A previous derivative-based method for reducing the microwave data is reviewed and an improved data reduction technique is introduced. The improved …
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Electrode length measurement in electric arc furnaces
Accurate measurement of electrode length in electric arc furnaces will result in decreased maintenance time, and improved plant productivity. This thesis describes the development of a microwave-based Soderberg electrode length-measurement system. Various methods of electrode-length measurement …
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Methods and analyses for evaluation of erosive burning in solid propellants
This investigation was concerned with the measurement and prediction of erosive burning. The theoretical models for erosive burning in composite propellants were reviewed. The experimental techniques which were cited in the literature for the measurement of erosive burning were also reviewed. Only …
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Hot electron injection effect and improved linearity in type-I/II DHBT for millimeter-wave mixed signal circuit applications
… results incorporated with material studies and microwave measurement of submicron devices are documented in Chapter 4. In Chapter 5, the Type-I/II HBT in this work is benchmarked and compared to foundry-manufactured Type-I InGaAs HBT. The DC and RF characterization are demonstrated. Linearity …
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S-parameter modeling of two-port devices using a single, memoryless nonlinearity
… of measured and model-predicted data for a microwave BJT. The proposed nonlinear model is represented by a linear three-port flowgraph having one of its ports terminated in a real-valued, nonlinear reflection. The model parameters are determined from measurements of device-under-test (DUT) …
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Analysis and modelling of the impact of anomalous propagation on terrestrial microwave links in a subtropical region, based on long-term measurements. Statistical analysis of long-term meteorological and signal strength measurements in a subtropical region and investigation of the impact of anomalous refractivity profiles on radio propagation in terrestrial microwave wireless systems
… experienced anomalous phenomena on terrestrial microwave links. Twenty-three years of meteorological measurements, from 1990 to 2013, are utilized using spatially separated surface stations and a single radiosonde in the United Arab Emirates (UAE). Profiles of sea level, surface and upper …
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Microwave techniques and applications for semiconductor quantum dot mode-locked lasers
… (OTDM), diverse waveform generation, and microwave signal generation. However, there are still several challenges to conquer for engineering applications. Semiconductor MLLs sources have generally not been able to match the noise performance and pulse quality of the best solid-state …
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Large-signal characterization and modeling of nonlinear devices using scattering parameters
… levels often requires specialized equipment and measurement techniques. Many large-signal devices will never have traditional nonlinear models because model development is expensive and time-consuming. Due to the complexity of the device or the size of the application market, nonlinear modeling …
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Quantum magnetic imaging for DNA biophysical measurements
… Additionally, if a flourescent probe is chosen, measurements can only be performed for time scales on the order of seconds due to photobleaching. In this thesis, a new imaging modality is developed that relies on ferro- magnetic probes of bio-mechanical orientation. Because a ferromagnet has an …