Browsing by Subject "Isolation"
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Item Design and testing of sub-wavelength panels for underwater acoustic isolation(2015-08) Hicks, Ashley Jean; Wilson, Preston S.; Haberman, Michael R.Underwater sound isolation is an important area of research for both environmental and military applications. This work explores present research in airborne thin panel acoustic metamaterials and underwater acoustic isolation using encapsulated bubbles. These ideas are combined in the design of sub-wavelength, free-standing underwater panels for acoustic isolation. This work investigates the resonance of cylindrical air cavities in water with at aspect ratios. The spherical resonance approximation proposed by Minnaert for gas bubbles in water is shown to provide a good approximation of the resonance frequency of cylindrical inclusions. Panels with cylindrical inclusions are developed and tested in the 500 Hz to 1.3 kHz range and the 2 kHz to 5 kHz range. Panels with a void fraction of 1.3% and non-dimensional kT value of 0.02 to 0.07 show a frequency averaged insertion loss of 3 dB to 8 dB. Additionally, it is shown that an increase in void fraction yields an increase in panel isolation capability. It is the hope that this and future work in the area of sub-wavelength panels will improve the underwater environment for marine life and underwater naval applications.Item Stress in tenure-track and non-tenure-track faculty : what we know and where we are going(2016-05) Harbison, Brooks Robert; McCarthy, Christopher J.; Rude, StephanieA great deal of research has over the last fifty years has examined chronic stress in the workplace across numerous vocations. Relatively little has been studied in the context of university faculty, and even less still has been examined in non-tenure track faculty (NTTF), individuals who seek academic work contingently and fill teaching, supervising, researching, and mentoring roles. This report outlines the extant knowledge on chronic stress in university faculty, ultimately focusing on the experiences of NTTF. Research into professor stress in the following domains are outlined: workplace factors, multicultural and sexual minority concerns, gender, and disparities in treatment and payment. Additional stress factors may affect NTTF that are not experienced by all university professors, such as perceived social status (PSS), workplace isolation, and incivility from students. Exploratory research into and implications of NTTF stress are discussed, and future research directions and possible clinical interventions for NTTF stress are suggested.