Master of Science in Aerospace Systems Engineering (MSASE), Wright State University, 2021, Mechanical Engineering

The dual-plane airfoil has been adopted in the design of aircraft wings, wind turbine blades, and propellers. The purpose of this research is to investigate the most important design parameters of a dual-plane airfoil model for the best aerodynamic performance, such as gap, stagger, and decalage. The dual-plane airfoil model was designed using the S826 profile. A mechanical mechanism with electrical actuator control is particularly designed to alter the gap and stagger smoothly, as well as the angle of attack (AOA) for each airfoil. It results in a gap range of 1.38c to 2.17c, a stagger range of -0.75c to 1.75c (c is the chord length), an AOA range of -10 to 20 degrees. The decalage angles of 0, 1, and 2 degrees are adopted in the tests for AOA=12 degrees. A low-speed open-circuit wind tunnel at Wright State University is used for the experiment at two Reynolds numbers, 𝑅𝑒=60000, and 𝑅𝑒=100000, respectively. Both airfoils are equipped with 21 pressure tap holes around the airfoil in the middle section. Pressure distribution data around the airfoil is sampled at a rate of 400 Hertz using the DSA 3217 Pressure Scanner. The collected data is processed to calculate the pressure coefficient on the surface of both airfoils. The pressure distribution profiles are generated and compared at various gaps, staggers, and decalages. Lift and drag coefficients are calculated by integrating the pressure distribution over the airfoil. It has been found that both stagger and gap have a significant effect on the pressure distribution at AOA of 12 degrees for the bottom airfoil. A gap ranges from 1.38c to 1.57c can suppress the separation and increase the lift coefficient of the top airfoil at various staggers and decalages. A stagger of 1.75c and negative staggers at a gap of 1.38c can suppress the separation and increase the lift coefficient of the bottom airfoil. Due to boundary layer separation, negative staggers are not effective for 𝑅𝑒=60000. The decalage effect is distinct at (open full item for complete abstract)

Committee: Zifeng Yang Ph.D. (Advisor); Jim Menart Ph.D. (Committee Member); Junghsen Lieh Ph.D. (Committee Member) Subjects: Aerospace Engineering; Mechanical Engineering

MS, University of Cincinnati, 2021, Engineering and Applied Science: Civil Engineering

The knife plate connection of a steel joist girder end to the top of a column is a typical connection used in roofing systems of single-story structures. A single line of field-welded fillet welds connects each angle of the double angle top chord to the knife plate between them. Under gravity loads, the top chord may be subjected to net tension and experience shear lag in the connection region due to the presence of welds. A summary of shear lag check based on previous and current building codes/ specifications (AISC and CSA) is discussed. Currently, there is no provision for shear lag in tension members connected by a single line of weld, and the current state of art practices this check in a knife plate connection using Case 4 in Table D3.1 of the AISC Specification (2016), which represents a tension member connected by two longitudinal welds. Besides, the welds may experience in-plane and out-of-plane eccentricities. This research will: 1) offer insight into the influence of the end panel region geometry on the potential net tension and shear lag consideration in the top chord; 2) provide recommendations on accounting for shear lag in knife plate connections with a single line of weld; and 3) provide recommendations for determining realistic demands on the fillet welds considering the effects of in-plane and out-of-plane eccentricities. Finite element models were developed to study the connection behavior in a component-level model and a full-scale joist girder model. Different weld connection configurations were explored using Finite Element Analysis to evaluate the role of weld eccentricities on the connection capacities. Based on the evaluation, the final recommendations emphasize the importance of incorporating both in-plane and out-of-plane eccentric demands caused by horizontal and vertical forces in the end connection region when designing the welds. Also, the use of end geometry configurations with zero to minimum in-plane eccentricity is recommended t (open full item for complete abstract)

Committee: Rachel Chicchi Ph.D. (Committee Chair); Richard Miller Ph.D. (Committee Member); Bahram Shahrooz Ph.D. (Committee Member) Subjects: Civil Engineering

BA, Oberlin College, 2020, Mathematics

One area of interest in studying plane curves is intersection. Namely, given two plane curves, we are interested in understanding how they intersect. In this paper, we will build the machinery necessary to describe this intersection. Our discussion will include developing algebraic tools, describing how two curves intersect at a given point, and accounting for points at infinity by way of projective space. With all these tools, we will prove Bezout's theorem, a robust description of the intersection between two curves relating the degrees of the defining polynomials to the number of points in the intersection.

Committee: Susan Jane Colley (Advisor) Subjects: Mathematics

Doctor of Philosophy, University of Akron, 2018, Civil Engineering

Corrosion is a process that occurs naturally under aggressive environmental conditions, and it causes deterioration of metals over an extended period of exposure time. A number of factors contribute to corrosion of metals, some of which can be controlled and others that cannot. Structures on oceangoing vessels are primarily constructed from steel plates, which are combined to form stiffened panels. These structural elements are highly susceptible to different types of corrosion, depending on the environment condition surrounding the steel members. Uniform corrosion (or general corrosion) and non-uniform corrosion (such as pitting corrosion, edge corrosion and groove corrosion) are the most common types of corrosion affecting structural elements such as decks, hulls, and other parts of ships. In many industries, it is common to assess the corrosion damage of structural components primarily based on visual inspection with limited or no structural stress analysis. Premature replacement of such components can prove expensive over time, while delaying the replacement of these components might become a safety issue. In order to assess the level of safety, the remaining life of the corroding structure needs to be predicted using structural and/or stress analysis. The overall goal in assessing the remaining life is to relate the loss of thickness in the system to the performance of the individual structural elements in order to achieve a better prediction. The objective of the project described in this dissertation was to develop a method to predict the remaining strength of stiffened panels exposed to different form of corrosion that are subjected to different loading conditions to simulate practical conditions in the operation of a ship. Experimental work was carried out on stiffened panels subject to different types and levels of corrosion. Finite Element Analysis (FEA) using the commercial software Abaqus was used to capture varying degrees of corrosion and the effects (open full item for complete abstract)

Committee: Anil Patnaik Dr. (Advisor); Craig Menzemer Dr. (Committee Member); David Roke Dr. (Committee Member); Xiaosheng Gao Dr. (Committee Member); Nao Mimoto Dr. (Committee Member) Subjects: Civil Engineering

Master of Science in Engineering, University of Akron, 2017, Electrical Engineering

Software-Defined Networks (SDN) have been introduced for wired networks that typically have point-to-point connectivity between nodes. The main idea in this approach is to separate the control plane and the data plane in order to allow users to programmatically change the networking capabilities of the system. This investigation focused on understanding how SDN concepts could be applied in a networked embedded systems environment where the nodes have limited capabilities and the wireless links have limited bandwidth. The goals were to realize the benefits of SDN while maintaining the network's topology and connectivity. A SDN controller was implemented on BeagleBone Black Board and interfaced with a networked embedded system via a sink node. The approach was validated through simulations and xperiments based on a physical testbed in multiple scenarios. In the future, the design can be extended to a fully capable Wireless-SDN system for use in a variety of applications such as Healthcare Systems, Internet of Things and Advanced Manufacturing Systems.

Committee: Shivakumar Sastry Dr. (Advisor); Nghi Tran Dr. (Committee Co-Chair); Jin Kocsis Dr. (Committee Member); Hamid Bahrami Dr. (Committee Member) Subjects: Engineering

Master of Arts, The Ohio State University, 1944, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Arts, The Ohio State University, 1916, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Arts, The Ohio State University, 1927, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Arts, The Ohio State University, 1915, Graduate School

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Master of Arts, The Ohio State University, 1933, Graduate School

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Master of Arts, The Ohio State University, 1928, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Arts, The Ohio State University, 1917, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Arts, The Ohio State University, 1960, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Arts, The Ohio State University, 1925, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Arts, The Ohio State University, 1939, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Science (M.S.), University of Dayton, 2024, Civil Engineering

Transfer of external, lateral loads from a masonry veneer to the load supporting wythe requires application of adhered or anchored veneer. In anchored veneer, a hollow region exists between the exterior veneer and interior wythe; spanned by flexible or adjustable mechanical anchors. Improvements in the allowable void space provide benefits to available insulating methodologies and to novel architectural design. The implementation of corrugated ties in anchored masonry veneer in current generation NCMA and TMS codes provides only 1-inch of allowable void space; more limited than any other approved anchorage method. This disparity bore two queries: could the existing corrugated tie product resist specified loads at extended void distances, and could a modified corrugated tie significantly improve the void gap performance? This evaluation employed experimental analysis to tune a computational model for evaluation of the proposed queries. Eighteen theoretical variables were examined with nine constrained by existing code or experimental findings and nine released for analysis and manipulation. Existing corrugated ties were determined to be inadequate for expanded void gaps due to racking of the veneer. Tie thickness expansion was identified as a plausible means of significantly improving allowable gap performance with valid configurations achieving 9-inches of allowable gap.

Committee: Elias Toubia PhD, PE (Committee Chair); Joseph Saliba PhD, PE (Committee Member); Thomas Whitney PhD, PE (Committee Member) Subjects: Civil Engineering

Master of Engineering, Case Western Reserve University, 2024, Biomedical Engineering

Radiomic analysis of individual regions or acquisitions has shown significant potential for predicting treatment response to neoadjuvant therapy in rectal cancers via routine MRI. We present a novel multi-plane, multi-region radiomics framework for exploiting intuitive clinical and biological aspects of rectal tumor response on MRI. Using a multi-institutional cohort of 151 baseline T2-weighted axial and coronal rectal MRIs, 2D texture features were extracted from multiple regions of interest (tumor, tumor-proximal fat) across both axial and coronal planes, with machine learning analysis to identify descriptors predictive of complete response to neoadjuvant therapy. Our multi-plane, multi-region radiomics model was found to significantly outperform single-plane or single-region feature sets with a discovery area under the ROC curve (AUC) of 0.765±0.054, and hold-out validation AUCs of 0.700 and 0.759. This suggests multi- region, multi-plane radiomics could enable detailed phenotyping of treatment response on MRI and thus personalization of therapeutic and surgical interventions in rectal cancers.

Committee: Satish Viswanath (Committee Chair); Amit Gupta (Committee Member); Juhwan Lee (Committee Member) Subjects: Artificial Intelligence; Bioinformatics; Biomedical Engineering; Biomedical Research; Medical Imaging

DNP, Otterbein University, 2025, Nursing

In the United States, the aging population and high rates of cardiovascular disease leads to increased cardiothoracic surgeries. Analgesia for cardiac surgeries often involves high-dose opioids. However, with an ever-increasing opioid epidemic and adverse effects on the postoperative healing process, recent literature seeks to decrease opioid consumption by utilizing alternative methods of analgesia. The American Association of Nurse Anesthetists recommends the use of regional anesthesia techniques to reduce the incidence of undertreated postoperative pain that can occur from opioid-sparing methods of analgesia. This project aims to create an evidence-based analgesia guideline for adult patients undergoing cardiac surgery. Interventions will include an erector spinae plane block and an opioid-sparing postoperative guideline; evidence shows that erector spinae plane blocks decrease postoperative opioid consumption and improve postoperative outcomes, specifically decreased postoperative mechanical ventilation time. The Johns Hopkins Evidence-Based Practice Guideline Model for Nurses and Healthcare Professionals will guide this process.

Committee: Regina Prusinski (Advisor); Amy Bishop (Committee Member); Joy Shoemaker (Committee Member); Brian Garrett (Committee Member) Subjects: Health Sciences; Medicine

DNP, Otterbein University, 2025, Nursing

Ventral hernia repairs are the only definitive treatment for umbilical or abdominal hernias. These procedures are prevalent and often lifesaving but also carry high risks of adverse effects. Some of the problems that follow include postoperative ileus, increased opioid use, and prolonged length of stay. Due to the rate of complications, there was a need to improve these outcomes. One way to improve outcomes is to implement superior anesthetic techniques. This Final Scholarly Project (FSP) followed the Plan-Do-Study-Act (PDSA) model to conduct evidence-based practice (EBP) and quality improvement (QI) sections. The plan phase included a thorough literature search and analysis and the design of recommendations. Current literature shows that the administration of transversus abdominis plane (TAP) blocks in patients undergoing open ventral hernia repairs decreases total opioid use and reduces length of hospital stay. The recommendation includes an ultrasound-guided technique to administer a TAP block in the operating room before incision. The TAP block will consist of liposomal bupivacaine and normal saline. There will be 60 milliliters of the anesthetic administered bilaterally. The Do phase includes the proposed implementation of the recommendations, which include training and communication with stakeholders. The Study phase will include collection of data and analysis of outcomes. The measured outcomes will be total opioid use and length of hospital stay. The Act phase will include adjusting the recommendation as necessary to achieve the best possible patient outcomes. The goal of the project is to improve outcomes for patients undergoing ventral hernia surgery by implementing EBP strategies.

Committee: Deana Batross DNP, RN, FNP-BC, PMHNP-BC, CCRN (Advisor); Amy Bishop DNP, AGCNS-BC (Committee Member); Joy Shoemaker DNP, APRN, FNP-BC, CNE (Committee Member); Kacy Ballard DNP, CRNA (Committee Member) Subjects: Medicine; Nursing

Doctor of Philosophy (Ph.D.), University of Dayton, 2024, Engineering

Fresnel coefficients (FCs) corresponding to a lossless magnetic achiral/chiral (ACC) interface under variable angles of incidence (of s-polarized light) and permittivity/permeability ratios are derived including the nonmagnetic-magnetic case, examining possible anomalous Brewster and critical angle conditions. Bimodal and single-mode propagation (including also cases where both characteristic modes (right- and left-circular) in the chiral region enter evanescence) across a magnetic chiral/achiral (CAC) interface are then examined for possible anomalies. Simulation results are presented along with interpretations, supported extensively by verified tabular data. Finally, the concepts behind examining magnetic chiral interfaces in the presence of realistic dielectric loss are introduced for the ACC interface, indicating how the Snell's laws are modified for each mode, and the decay behavior of the fields have to be re-derived to accommodate the effect of loss. It is found that upon both transmission and reflection, the incident plane wave transforms into two modes RCP and LCP propagating in any (isotropic) chiral region. In consequence, Brewster and critical angles were found under zero chirality demonstrating some anomalous characteristics, but at about a factor 2 correspondence with the purely achiral case. Additionally, we find that Brewster angles can be disappear at specific band of the κ which mean anomalies behavior comparing with achiral magnetic material. Under chiral conditions, possible Brewster and TIR effects were also discovered under different κ values. In addition, the observed a TIR effect was verified property that above this (critical) angle the transmitted field is evanescent, with an imaginary transmitted angle. Non-complementarity of the Brewster angles was also observed (thereby being similar to the findings for the non-magnetic problem; however, for the latter, Brewster typically manifested for one pair of dielectrics, but not under switching (open full item for complete abstract)

Committee: Monish Chatterjee (Advisor) Subjects: Electrical Engineering; Optics