This thesis presents a comparison of time-domain and frequency-domain
algorithms for phase noise calculation in oscillators. Floquet theory provides the
mathematical foundation for these calculations and the numerical methods employ
perturbation projection vectors (PPVs). The PPVs are an estimate of an
oscillator's sensitivity to noise.
The in-house circuit simulator SPICE3...
Predicting condensation flow regimes and the associated heat transfer and pressure drop in microchannels is critical for designing terrestrial and space systems for heating, cooling, power generation, and advanced manufacturing. It is well established that in flows approaching the microscale (Dh < 1 mm) gravity-dominated flow regimes become less relevant,...
Materials based on BiMO₃-modified BaTiO₃ have been shown to exhibit a number of attractive electrical and electromechanical properties. In addition, many of the materials in this broad family exhibit reduced sintering temperatures for densification as compared to pure BaTiO₃. We report here a study of the phase evolution and sintering...
Spacecrafts experience radiation in the course of their operation
and all electronic equipment on board these spacecrafts has to
be designed to withstand the effects of this radiation.
This thesis describes the effects of total ionization dose (TID)
and single event transients (SET) in phase-locked loops - an
important circuit...
Pyroprocessing is an advanced technology for recycling used nuclear fuel. Pyrochemical processes encompass a wide range of chemical, physical, and electrochemical methods to partition fission products and other components from used nuclear fuel, which allows for the reuse of the actinides in nuclear fuel. This dissertation investigates two chemical systems...
Several frequency and amplitude estimation algorithms are presented for balanced and unbalanced three-phase power grid systems. All the estimators are dynamic in nature and are implemented in the complex domain by transforming the three-phase power signals using Clarke’s transform. Specifically, we first construct a non-linear dynamic model of the complex...
Topological defects, such as monopoles, vortex lines or domain walls, mark locations where disparate choices of a broken-symmetry vacuum elsewhere in the system lead to irreconcilable differences(1,2). They are energetically costly (the energy density in their core reaches that of the prior symmetric vacuum) but topologically stable (the whole manifold...
Many volatile compounds generated during the thermal
processing of milk have been associated with
cooked, stale, and sulfurous notes in milk and are considered
as off-flavor by most consumers. A headspace
solid-phase microextraction (HS-SPME)/gas chromatographic
technique for the quantitative analysis of thermally
derived off-flavor compounds was developed in
this study....
Three-dimensional chemical imaging of Fe–Cr alloys showing Fe-rich (α)/Cr-rich (α') phase separation is reported using atom probe tomography techniques. The extent of phase separation, i.e., amplitude and wavelength, has been quantitatively assessed using the Langer-Bar-on-Miller, proximity histogram, and autocorrelation function methods for two separate Fe–Cr alloys, designated 2101 and 2205....
The objective was to compare the acute-phase response of steers receiving different doses of bovine corticotropin-releasing hormone (CRH). Fourteen weaned Angus steers (BW = 191 ± 2.1 kg, age = 167 ± 4.7 d) fitted with an indwelling jugular catheter and a rectal temperature (RT) monitoring device were assigned to...