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Search for Lepton Flavour Violating Decays Tau -> l Ks with the BABAR Detector

Description: We present the search for the lepton flavour violating decay {tau} {yields} lK{sup 0}{sub s} with the BaBar experiment data. This process and many other lepton flavour violating {tau} decays, like {tau} {yields} {mu}{gamma} and {tau} {yields} lll, are one of the most promising channel to search for evidence of new physics. According to the Standard Model and the neutrino mixing parameters, branching fractions are estimated well below 10{sup -14}, but many models of new physics allow for branchi… more
Date: March 20, 2009
Creator: Cenci, Riccardo
Partner: UNT Libraries Government Documents Department
open access

The Development of the Electrically Controlled High Power RF Switch and Its Application to Active RF Pulse Compression Systems

Description: In the past decades, there has been increasing interest in pulsed high power RF sources for building high-gradient high-energy particle accelerators. Passive RF pulse compression systems have been used in many applications to match the available RF sources to the loads requiring higher RF power but a shorter pulse. Theoretically, an active RF pulse compression system has the advantage of higher efficiency and compactness over the passive system. However, the key component for such a system an e… more
Date: March 20, 2009
Creator: Guo, Jiquan
Partner: UNT Libraries Government Documents Department
open access

Building Structural Complexity in Semiconductor Nanocrystals through Chemical Transformations

Description: Methods are presented for synthesizing nanocrystal heterostructures comprised of two semiconductor materials epitaxially attached within individual nanostructures. The chemical transformation of cation exchange, where the cations within the lattice of an ionic nanocrystal are replaced with a different metal ion species, is used to alter the chemical composition at specific regions ofa nanocrystal. Partial cation exchange was performed in cadmium sulfide (CdS) nanorods of well-defined size and s… more
Date: May 20, 2009
Creator: Sadtler, Bryce F.
Partner: UNT Libraries Government Documents Department
open access

Extreme ultraviolet lithography: A few more pieces of the puzzle

Description: The work described in this dissertation has improved three essential components of extreme ultraviolet (EUV) lithography: exposure tools, photoresist, and metrology. Exposure tools. A field-averaging illumination stage is presented that enables nonuniform, high-coherence sources to be used in applications where highly uniform illumination is required. In an EUV implementation, it is shown that the illuminator achieves a 6.5% peak-to-valley intensity variation across the entire design field of v… more
Date: May 20, 2009
Creator: Anderson, Christopher N.
Partner: UNT Libraries Government Documents Department
open access

Masters Thesis- Criticality Alarm System Design Guide with Accompanying Alarm System Development for the Radioisotope Production Laboratory in Richland, Washington

Description: A detailed instructional manual was created to guide criticality safety engineers through the process of designing a criticality alarm system (CAS) for Department of Energy (DOE) hazard class 1 and 2 facilities. Regulatory and technical requirements were both addressed. A list of design tasks and technical subtasks are thoroughly analyzed to provide concise direction for how to complete the analysis. An example of the application of the design methodology, the Criticality Alarm System developed… more
Date: December 20, 2009
Creator: Greenfield, Bryce A.
Partner: UNT Libraries Government Documents Department
open access

Linking Automated Data Analysis and Visualization with Applications in Developmental Biology and High-Energy Physics

Description: Knowledge discovery from large and complex collections of today's scientific datasets is a challenging task. With the ability to measure and simulate more processes at increasingly finer spatial and temporal scales, the increasing number of data dimensions and data objects is presenting tremendous challenges for data analysis and effective data exploration methods and tools. Researchers are overwhelmed with data and standard tools are often insufficient to enable effective data analysis and kn… more
Date: November 20, 2009
Creator: Ruebel, Oliver
Partner: UNT Libraries Government Documents Department
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