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Physical Sciences and Mathematics Commons™
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Full-Text Articles in Physical Sciences and Mathematics
Blue Cheese Cosmology: Lensing By Cosmic Strings, Jared Wofford
Blue Cheese Cosmology: Lensing By Cosmic Strings, Jared Wofford
Honors Theses
The light bending effects around cosmic strings in universes with varying rates of expansion are investigated. A relationship between the angular deflection and the expansion rate is found. This is made possible by the Blue Cheese model, which is a generalization to a cylindrical realm of the Swiss Cheese model
Noise Reduction In The Manufacturing Environment: A Study On Small Jet Geometry Alterations, Shawn Wesley Skinner
Noise Reduction In The Manufacturing Environment: A Study On Small Jet Geometry Alterations, Shawn Wesley Skinner
Honors Theses
Noise pollution is an identified issue in manufacturing environments. While machines, motion, production, etc. are a large factor in this noise pollution, other sources exist. Often copper tubing is connected to pressurized containers as a make-shift jet stream for reorienting elements on the assembly line. These makeshift jets when working in conjunction create noise pollution. By manipulating the exit of these small jets, it is hypothesized that the noise level can be decreased. Using the National Center for Physical Acoustics (NCPA) at the University of Mississippi, three geometry alterations—deburring the end, creating a converging-diverging nozzle, and flattening the end—were tested …
Multidimensional Motion Capture Using Doppler Ultrasound, Forrest Nolan Gamble
Multidimensional Motion Capture Using Doppler Ultrasound, Forrest Nolan Gamble
Honors Theses
Ultrasonic waves are used to measure the velocity of a target object by measuring the Doppler shift of the reflected waves. In this work, ultrasonic Doppler Sonar (UDS) was used to measure the velocity of objects, including a pendulum and a battery on a turntable. The investigation focused on developing a method to measure motion in two and three dimensions, for applications in gait analysis and sports motion capture. By using multiple ultrasonic transducers and novel data processing techniques, the UDS captured motion in two and three dimensions. In order to test the accuracy of the velocity and position measurements, …
Calculating Liquefaction Potential Of Northern Mississippi Using Shear Wave Data, Peshani Herath
Calculating Liquefaction Potential Of Northern Mississippi Using Shear Wave Data, Peshani Herath
Honors Theses
The potential for liquefaction can be determined using the Liquefaction Potential Index (LPI). The LPI takes into account the thickness of the liquefiable layers and the factors of safety with respect to depth. This study creates a hybrid method for determining the LPI for different locations in Northern Mississippi. It calculates an average CSR for the region using existing borehole information. The CRR is then calculated using shear wave velocity profile data from a MASW survey. The LPI obtained from this process is compared to LPI values calculated using CPT data and borehole shear wave data. Surface shear wave velocity …
A Study On The Characterization And Implementation Of Tools For Advanced Ligo, Hunter Gabbard
A Study On The Characterization And Implementation Of Tools For Advanced Ligo, Hunter Gabbard
Honors Theses
The Laser Interferometer Gravitational Wave Observatory (LIGO) is aimed at directly detecting gravitational waves, small perturbations or ripples in the fabric of space-time. Because of their extreme sensitivity, the LIGO detectors are affected by many sources of non-astrophysical noise. In the first part of this thesis we test a pipeline designed for the identification of short-duration noise transients, called Omicron. We first inject simulated noise waveforms in engineering run data from the LIGO detector in Livingston, Louisiana and then determine Omicron efficiency by attempting to recover these injections. In the second part of this thesis, we present a novel method …