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2025-04-04 Minutes of the Executive Committee of the Academic Senate
Get PDFApproved minutes of a meeting of the Executive Committee of the Academic Senate of the University of Dayton
Importance of Objective Assessment to Determine Physical Function in Persons Undergoing Autologous Hematopoietic Stem Cell Transplantation
Get PDFEating Habits of College Students
Get PDFThe writing process for this project began with research and thinking of how to understand the ways that college affects students\u27 eating habits. I gathered sources, took notes, and created an outline to organize my ideas. I found studies on college and parental influence on undergraduate students\u27 nutritional habits. The first draft I wrote helped shape my argument, which I then revised by improving the thesis, refining transitions, and adding evidence. One of these sources of evidence being data from a survey I conducted in my research. Final edits focused on clarity and flow, in order to insure that the essay effectively explains the challenges of eating healthily in college
Jane Goodall\u27s Integration of Science and Spirituality
Get PDFAs our final project for my ENG 198 class, we were asked to write a paper that related to the courses theme of Faith and Reason. I decided to choose the prompt of reporting on a scientist who maintained a spiritual connection in their life. After some initial research, I decided to focus on Jane Goodall and how her scientific discoveries were impacted by her religion
Ugly Love
No full textUgly Love, by Colleen Hoover, is about a woman, Tate Collins, who moves in with her brother to start a new student nursing job. She ends up forming an intense connection with a quiet, guarded, emotionally shut down airline pilot, Miles Archer. They agree to keep things strictly physical involving two clear and important rules with no greater expectations. As their bond deepens, Tate begins to struggle keeping her emotions separate from their relationship while Miles struggles with his past. This novel demonstrates how love can be messy and difficult to navigate; it also explores themes of boundaries, vulnerability, self-worth, and forgiveness.https://ecommons.udayton.edu/ul_popularromance/1106/thumbnail.jp
2025-12-12 Minutes of the Executive Committee of the Academic Senate Senate
No full textApproved minutes of a meeting of the Executive Committee of the Academic Senate of the University of Dayton
Innovative Electro-Optical Devices for Light Beam Control
No full textThe Electro-Optical (EO) effect refers to the change in the optical properties of a material in response to a slowly varying external electric field compared to optical frequencies. This effect is key in EO modulators and beam steerers, which utilize the medium\u27s linear or quadratic EO effect to modulate or steer light. A traveling-wave Mach-Zehnder modulator (TW-MZM) is used in optical communications for rapid and efficient light modulation, with a longer interaction region ideal for high-speed applications compared to lumped-element versions. On the other hand, the EO beam steerers use either an optical phased array (OPA) based on an EO thin film or a bulk EO crystal. Despite advantages like speed, robustness, and compactness, the EO steerers have limited angles, apertures, and high production costs. OPAs also struggle with low diffraction efficiency and dispersion, while bulk crystals are crystal polarization-dependent and require high voltages. To overcome or mitigate some of those drawbacks, this dissertation aims to tackle the following five key questions that have remained unresolved in the field of EO beam steerers for decades. How can bulk EO crystals be used for fast deformable mirrors, various types of varifocal lenses, and nonmechanically steer a large aperture light to a wide angle? How to increase the efficiency of OPAs and overcome the dispersion? How to make the OPAs manufacturable due to the very large number of electrodes? How to steer a large aperture continuously to a wide angle with OPAs? How can light be steered in a mechanical and non-mechanical hybrid manner to direct it mechanically and scan within a small area non-mechanically, or to perform back scanning non-mechanically? This approach is particularly relevant in space applications, where back scanning may be important to account for delays caused by the speed of light. The first section of the research provides a detailed exploration of a bulk SBN75 single crystal - known for its high linear EO effect, and a polycrystalline PMN-PT - noted for its strong quadratic (Kerr) effect. It involves designing, simulating, and testing a laser beam steering device with these EO crystals under various conditions. The SBN steerer is thoroughly evaluated by measuring the first and second EO effects and all linear EO coefficients (r_13, r_33, r_51) based on laser beam deflection angles, with comparisons to literature values. To overcome the need for poling the EO crystal and to provide a larger EO medium, a polarization-independent EO steerer with PMN-PT ceramic has been designed. This design steers light from visible to mid-IR wavelengths, evaluating the quadratic effect\u27s dispersion and temperature dependency. This research further branches into the design and optimization of a TW-MZM for six diverse EO crystals - Lithium Niobate (LNB), Potassium Niobate (KNB), Lithium Titanate (LTO), Beta Barium Borate (BBO), Cadmium Telluride (CdTe), and Indium Phosphide (InP). Broad performance metrics, including optical and radio frequency (RF) loss, applied voltage, and modulation bandwidth, are estimated and compared to single out potential alternatives that can outperform LNB, the most commonly employed EO crystal in modern EO modulators. The second section of this dissertation presents three innovative approaches to addressing the five major questions alluded to above. How can the light be expanded and steered simultaneously and defy the aperture expansion law? How can a light steerer handle any type of incoming and outgoing light? How to design a novel light scanner that overcomes the disadvantages of current mechanical steerers, such as single thread, blind spot, dispersion, large number of elements, and inertia due to the large size of the moving parts? The three innovative approaches outlined provide the means to address the aforementioned five critical questions, aiming to improve the efficiency, manufacturability, and affordability of the EO steerers, potentially paving the way for their deployment in demanding applications such as the military, laser communication, and space applications
Ductile Fracture of Ti-6Al-4V Titanium Alloy Under Compressive Stress States
No full textA notoriously challenging modeling and simulation problem is the impact physics of jet engine debris striking the engine case during a fan blade-out or rotor-burst event. The multiplicity of potential failure modes resulting from the impact and subsequent penetration of high-speed engine fragments advances the challenge. The ductile fracture model must be robust to account for all potential failure modes. The failure locus, a key ingredient in many state-of-the-art ductile fracture models, is a three-dimensional surface plot of the equivalent plastic strain at fracture as a function of the state of stress, quantified by the stress triaxiality and Lode parameter. Standard mechanical tests are generally used to populate the failure locus, but standard tests can only capture a limited window of stress states. This limited window potentially leaves important regions of the failure locus unpopulated. For instance, a significant body of previous research suggests that fracture will not occur above a stress triaxiality of 0.33 (known as the “cut-off” value). However, recent ballistic impact simulations involving 12.7-mm-thick Ti-6Al-4V titanium alloy plates predict large positive (compressive) triaxialities in the vicinity of the adiabatic shear band. These results not only suggest the potentially unanticipated importance of the positive triaxiality (compressive) region of Lode-triaxiality stress space, but also the need to experimentally revisit 3previous interpretations of the “cut-off” value of the triaxiality. Toward that end, this thesis investigates the ductile fracture of 6.35-mm-thick and 12.7-mm-thick Ti-6Al-4V titanium plate under compressive stress states. Specifically, our experimental plan is designed to interrogate the quasi-static ductile fracture behavior of Ti-6Al-4V plate under complex, highly triaxial, compression-dominated stress states. To achieve this, our testing program employs a series of cylindrical compression specimens with asymmetric features and/or geometric irregularities including vertical through-holes, 45-degree through-holes, horizontal throughholes, a 45-degree slot, and a spherical recess. This test series is intended to complement previous ductile fracture experiments performed on the same lot of 12.7-mm-thick Ti-6Al4V plate stock. Stereo digital image correlation is used to measure surface displacements and compute full-field strains at and near the fracture location. The experimental results are coupled with numerical simulations in LS-DYNA to calculate the stress state evolution and fracture strain at the site of fracture initiation. Weighted-average triaxialities of 0.61, 0.72, and 0.81 are reported for the specimens with through-holes, placing these experiments among the most compression-dominated in the literature
Career Advising: The Impact of Academic Advising on Students’ Educational Achievement and Future Employment Outlook
No full textThis qualitative study examined the impact of academic advising on students\u27 educational achievements and future employment outlook. Utilizing a phenomenological approach, the study explored students\u27 lived experiences with academic advisors across four Tribeca University campuses (pseudonym). Data were collected through semi- structured interviews with six participants, including students and alumni, and analyzed using qualitative content analysis (QCA). Key findings indicated that while advisors played an essential role in guiding students academically, their impact on career preparedness varied. Themes identified included advisors as administrative guides vs. mentors, development of soft skills, accessibility of advisors, and motivation for learning. The study highlighted the need for holistic advising models that integrated career counselling and personalized support. Findings suggested that enhancing the frequency and quality of advisor-student interactions could improve student satisfaction, retention rates, and career readiness. These insights contributed to the ongoing discourse on academic advising and student success