Digital Commons Network^™

An Airloads Theory For Morphing Airfoils In Dynamic Stall With Experimental Correlation, Loren Ahaus

All Theses and Dissertations (ETDs)

Helicopter rotor blades frequently encounter dynamic stall during normal flight conditions, limiting the applicability of classical thin-airfoil theory at large angles of attack. Also, it is evident that because of the largely different conditions on the advancing and retreating sides of the rotor, future rotorcraft may incorporate dynamically morphing airfoils: trailing-edge flaps, dynamic camber, dynamic droop, etc.). Reduced-order aerodynamic models are needed for preliminary design and flight simulation. A unified model for predicting the airloads on a morphing airfoil in dynamic stall is presented, consisting of three components. First, a linear airloads theory allows for arbitrary airfoil deformations consistent with …

Drilling Induced Fatigue Damage In Ti-6al-4v, James Castle

All Theses and Dissertations (ETDs)

The objective of this work is to develop an understanding of the relationship between hole drilling processes and the fatigue performance of the resulting part in Ti-6Al-4V. This problem is significant, as on the order of one-hundred thousand to a million holes are created in a typical large aircraft, and the limiting performance criterion is usually the fatigue lifetime. The path between the drilling process parameters and the fatigue performance has two main steps: characterization of the thermo-mechanical drill process and assessment of the relationship between the hole integrity left by the drill process and the fatigue performance. Development has …

Characterization Of Scannable Leaky Wave Antennas Using An Extended Metamaterial Framework, Garrett Gilchrist

All Theses and Dissertations (ETDs)

No abstract provided.

Ionic Mechanisms Of Action Potential Rate Dependence, Conduction And Block In Normal Epicardium And In Remodeled Epicardium Post-Infarction, Keith Decker

All Theses and Dissertations (ETDs)

In this work, detailed computational models are used to study the electrophysiology of normal epicardium and the arrhythmogenic effects of epicardial cell remodeling post-infarction. The canine epicardial myocyte model described here reproduces a wide range of experimentally observed rate dependent phenomena in cell and tissue. Model behavior depends on updated formulations for the 4-AP sensitive transient outward current: Ito1), the slow component of the delayed rectifier potassium current: IKs), the L-type Ca2+ channel: ICa,L) and the sodium-potassium pump: INaK) fit to data from canine ventricular myocytes. The model shows that Ito1 plays a limited role in potentiating peak ICa,L and …

Adaptive Ofdm Radar For Target Detection And Tracking, Satyabrata Sen

All Theses and Dissertations (ETDs)

We develop algorithms to detect and track targets by employing a wideband orthogonal frequency division multiplexing: OFDM) radar signal. The frequency diversity of the OFDM signal improves the sensing performance since the scattering centers of a target resonate variably at different frequencies. In addition, being a wideband signal, OFDM improves the range resolution and provides spectral efficiency. We first design the spectrum of the OFDM signal to improve the radar's wideband ambiguity function. Our designed waveform enhances the range resolution and motivates us to use adaptive OFDM waveform in specific problems, such as the detection and tracking of targets. We …

User Study Of Information Extracted From Engineering Representations, Rachel Hannah

All Theses

It is important for designers to understand the usefulness of different engineering representations in order to save time and money throughout a project. Designers often rely on past experience to decide which model to construct; yet students without this experience have no help. Interestingly there are noticeable gaps in the research literature with respect to how and when to select representations and modeling approaches for engineering designs. This thesis examines the differences between three types of engineering representations, specifically sketches, drawing packages, and physical prototypes. The amount of information designers can extract from these representations and also the correctness and …

Abet Accreditation Criteria, Outcome H And Global Competencies In Engineering Education, Elisabeth Sanchez-Goni

Graduate Theses, Dissertations, and Problem Reports (ETD)

The dissertation focuses on one aspect of the accreditation process of engineering programs in the United States, which is conducted under the standards of the Accreditation Board for Engineering and Technology (ABET). Engineering programs seeking accreditation are required to comply with the so called Engineering Criteria 2000 (EC2000), which has been divided into eleven "learning outcomes," labeled a through k. The dissertation addresses one of them, "Outcome h", which specifically calls for "the broad education necessary to understand the impact of engineering solutions in a global, economic, environmental, and societal context.";The dissertation examines what engineering departments, from the Southern Regional …

Terrain Constrained Stereo Correspondence, Gabrielle Inglis, Chris Roman

Graduate School of Oceanography Faculty Publications

There is a persistent need in the oceanographic community for accurate three dimensional reconstructions of seafloor structures. To meet this need underwater mapping techniques have expanded to include the use of stereo vision and high frequency multibeam sonar for mapping scenes 10's to 100's of square meters in size. Both techniques have relative advantages and disadvantages that depend on the task at hand and the desired accuracy. In this paper, we develop a method to constrain the often problematic stereo correspondence search to small sections of the image that correspond to estimated ranges along the epipolar lines calculated from coregistered …

The Use Of Robotics, Gps And Gis Technologies To Encourage Stem-Oriented Learning In Youth, Viacheslav I. Adamchuk, Gwen Nugent, Bradley S. Barker, Neal Grandgenett

Teacher Education Faculty Proceedings & Presentations

In our technology rich world, the educational areas of science, technology, engineering, and mathematics (STEM) play an increasingly essential role in developing well-prepared specialists for the 21st century workplace. Unfortunately, interest in theses areas has been declining for a few decades. Various innovative educational initiatives in formal and informal learning environments have been undertaken nationally to attempt to encourage STEM-oriented learning. Funded by the National Science Foundation, the particular program described in this paper focuses on middle school youth in non-formal learning environments. The program integrates educational robotics, Global Positioning System (GPS) and geographic information system (GIS) technologies to provide …

Subpixel Detection Of Circular Objects Using Geometric Property, Wen-Yen Wu, Vincent Wen-Bin Yu

Business and Information Technology Faculty Research & Creative Works

In this paper, we propose a method for detecting circular shapes with subpixel accuracy. First, the geometric properties of circles have been used to find the diameters as well as the circumference pixels. The center and radius are then estimated by the circumference pixels. Both synthetic and real images have been tested by the proposed method. The experimental results show that the new method is efficient.

Survey Of Concurrent Engineering Environments And The Application Of Best Practices Towards The Development Of A Multiple Industry, Multiple Domain Environment, Jonathan Osborn

All Theses

This thesis investigates the best practices of fifteen existing Concurrent Engineering Environments (CEE). A CEE is defined as any environment, from physical to virtual, designed to facilitate concurrent engineering with multiple domain experts real time. All existing environments surveyed have been focused on the aerospace industry showing significant reductions in design time and cost. I have identified hardware, software, and peopleware as three major classifications as well as sixteen subcategories with which to compare the different CEEs. The success in reducing time and cost of designs seen in the aerospace industry with the introduction of CEEs can and should be …

Versal Deformations Of Leibniz Algebra., Ashis Mandal Dr.

Doctoral Theses

No abstract provided.

An Investigation Of Middle School Student Interest, Perception, And Attitude Toward Technology And Engineering, Kari Marie Cook

Theses and Dissertations

The purpose of this study was to investigate middle school student perception and attitude toward technology and engineering and to better understand how the gender of the teacher, gender of the student, and information provided in technology classes affected their perception and attitude. To accomplish this, the Technology Attitude Scale, and the Pupil's Attitudes Toward Technology—United States assessment instruments were used to form the basis of a new survey instrument focused on technology and engineering perception, use, and interest. The new survey instrument is called the Technology and Engineering Attitude Scale (TEAS) survey. Multiple 7th grade technology engineering classes from …

An Investigation Of Utah Technology Education Teachers' Acceptance Of An Emphasis On Engineering Education Content, Douglas Ron Livingston

Theses and Dissertations

The purpose of this study is to collect information documenting Utah technology education teachers' acceptance of an emphasis on engineering content in technology education. The Stages of Concern Questionnaire (SoCQ) was used to determine the level of acceptance of this change. It was found that a majority of technology and education teachers are more concerned about other unidentified tasks, activities or initiatives than they are about the addition of engineering content to their classes. They were also shown to be concerned with being able to organize, manage, and schedule the change effectively and were found to be least concerned about …

Slides: Water Footprints: Consciousness Raising Meets Risk Management, Steve Malloch

Western Water Law, Policy and Management: Ripples, Currents, and New Channels for Inquiry (Martz Summer Conference, June 3-5)

Presenter: Steve Malloch, Senior Western Water Program Manager, National Wildlife Federation, Seattle, WA

38 slides

The First Frontier: High Altitude Ballooning As A Platform For Student Research Experiences In Science And Engineering, Shane L. Larson, John C. Armstrong, William A. Hiscock

All Physics Faculty Publications

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High altitude balloon platforms are ideal for providing hands-on research experiences for students in physics, atmospheric science, engineering, and other aerospace-related disciplines. We describe a basic high altitude balloon platform that can be constructed and operated by undergraduate students. The existing HARBOR and BOREALIS programs are used to illustrate some possible science and engineering research projects that students can pursue as part of a high-altitude flight program.

Growth Factor Delivery From Fibrin Matrics Containing Affinity-Based Delivery Systems To Treat Peripheral Nerve Injury, Matthew Wood

All Theses and Dissertations (ETDs)

This thesis work sought to develop a biomaterial to further the understanding of affinity-based delivery and to serve as a potential treatment for peripheral nerve injury. The use of an affinity-based delivery system: ABDS) with growth factors in a nerve guidance conduit: NGC) was hypothesized to promote nerve regeneration and functional recovery following a critical nerve defect. Evaluation of affinity-based delivery using peptides with varying binding affinity for heparin determined that peptide binding affinity for heparin affected the release rate and biological activity of nerve growth factor: NGF) in vitro. The ABDS presented biologically active NGF, which promoted neurite extension …

Why They Stay: Career Longetivity Of Women In U.S. Corporate Engineering, Kathleen R. Buse

Student Scholarship

Women have a low representation in engineering as well as other science, technology, and math (STEM) fields as compared to other professions – and retention rates for males in engineering significantly exceed those for women. While previous research has identified numerous reasons why women exit STEM careers at a higher rate than men, the literature is silent about those women who stay. To better understand why women remain in corporate engineering professions despite well-researched and well-documented organizational and occupational obstacles that make it difficult for them to succeed, a qualitative study is proposed based on semi-structured interviews with both women …

Development Of A New Lagrangian Float For Studying Coastal Marine Ecosystems, Alex Schwithal, Chris Roman

Graduate School of Oceanography Faculty Publications

This paper presents an overview and initial testing results for a shallow water Lagrangian float designed to operate in coastal settings. The presented effort addresses the two main characteristics of the shallow coastal environment that preclude the direct of use of many successfully deep water floats, namely the higher variation of water densities near the coast compared with the open ocean and the highly varied bathymetry. Our idea is to develop a high capacity dynamic auto-ballasting system that is able to compensate for the expected seawater density variation over a broad range of water temperatures and salinities while using measurements …

Studies On Construction And List Decoding Of Codes On Some Towers Of Function Fields., M. Prem Laxman Das Dr.

Doctoral Theses

In everyday life, there arise many situations where two parties, sender and receiver, need to communicate. The channel through which they communicate is assumed to be binary symmetric, that is, it changes 0 to 1 and vice versa with equal probability. At the receiver’s end, the sent message has to be recovered from the corrupted received word using some reasonable mechanism. This real life problem has attracted a lot of research in the past few decades. A solution to this problem is obtained by adding redundancy in a systematic manner to the message to construct a codeword. The collection of …

Physics Alumni Newsletter Spring 2009, Terry Goforth

Physics Alumni Newsletter

Physics Alumni Newsletter

The Physics Alumni Newsletter is produced by the SWOSU Physics Department.

Our Engineering Physics students are recruited in fields such as electronics, aerospace, mechanical engineering, petroleum engineering and software engineering. Graduates also have careers in meteorology, architecture, education and more.

Placement And Range Assignment In Power-Aware Radio Networks., Gautam Kumar Das Dr.

Doctoral Theses

Due to the extraordinary growth of demand in mobile communication facility, design of efficient systems for providing specialized services has become an important issue in wireless mobility research. Broadly speaking, there are two major models for wireless networking: single-hop and multi-hop. The single-hop model [110] is based on the cellular network, and it provides one-hop wireless connectivity between the host and the static nodes known as base stations. single-hop networks rely on a fixed backbone infrastructure that interconnects all the base stations by high speed wired links. On the other hand, the multi-hop model requires neither fixed wired infrastructure nor …

All The More Reason For Qr Across The Curriculum, Bernard L. Madison

Numeracy

No abstract provided.

Delivering Core Engineering Concepts To Secondary Level Students, Chris Merrill, Rodney L. Custer, Jenny Daugherty, Martin Westrick, Yong Zeng

Publications

Within primary and secondary school technology education, engineering has been proposed as an avenue to bring about technological literacy (Lewis, 2005; Dearing & Daugherty, 2004). Different initiatives such as curriculum development projects (i.e., Project ProBase and Project Lead The Way) and National Science Foundation funded projects such as the National Center for Engineering and Technology Education (NCETE) have been developed to infuse engineering into primary and secondary education. For example, one key goal of the technology teacher education component of NCETE is to impact the focus and content of the technology education field at the secondary level (National Center for …

Development Of A Carbon-Carbon Sandwich Composite With A Cellulose, Matt Brown

Mahurin Honors College Capstone Experience/Thesis Projects

The development of a carbon-carbon sandwich composite with a cellulose derived core was developed and its properties investigated. This type of hybrid composite has never been made before. The goal was to combine the high temperature properties of carbon-carbon composites with the low weight of sandwich composites. In order to create a material with superior thermal properties and a high specific strength a carbon-carbon sandwich composite was developed utilizing a carbonized wood core. The composite was successfully constructed using an industrial grade carbon glue to hold two layers of carbon fiber weave on the top and bottom of the core. …

Factors Influencing African American High School Students In Career Decision-Making Self-Efficacy And Engineering-Related Goal Intentions, Chandra Yvette Austin

Dissertations

A current challenge in the United States is to increase African American pursuit of engineering careers. Minority students generally tend to be under-represented in such careers, as indicated by the National Academy of Engineering, in The Engineer of 2020-Visions of Engineering in the New Century. This study explores the career decision self-efficacy (Lent, Brown & Hackett, 1993) and Engineering related goal intentions of African American high school students. There are a variety of reasons explaining the lack of choice of engineering as a career, and these were investigated. This study assessed the effect of specific influences (ethnic identity, demographic factors, …

Engineering Problem Finding In High School Students, Benjamin James Franske

Dissertations

The purpose of this study was to explore the engineering problem finding ability of high school students at three high schools in Minnesota. Students at each of the three schools had differing backgrounds including pre-engineering coursework, traditional technology education coursework and advanced science coursework. Students were asked to find problems in two different engineering scenarios which were presented to them on a paper and pencil instrument. Responses were scored by a panel of judges based on measures of creativity (flexibility, fluency, originality and elaborateness) and analyzed based on demographic data including gender, prior coursework and school. In addition student responses …

Using Engineering Cases In Technology Education, Todd R. Kelley

Publications

The article discusses issues related to the use of engineering case studies in technology education in K-12 classrooms. Experts from K-12 education, universities, industry and U.S. government officials came to an agreement on the need to implement engineering in K-12 schools. In relation to the proposed use of engineering case studies in technology education, several definitions of the term "design case studies." The presentation of cases using multimedia formats is also cited as a powerful format of engineering design cases.

Motivation While Designing In Engineering And Technology Education Impacted By Academic Preparation, Nathan Mentzer, Kurt Becker

Publications

The purpose of this study was to determine if high school students’ academic preparation was correlated with change in motivation during an engineering design challenge. The research was conducted in a high school classroom in which elements of engineering design were taught in a technology education context to eleventh-grade student from diverse academic backgrounds (measured by grade point average [GPA]). Participant motivation was assessed by the California Measure of Mental Motivation (CM3). The CM3 measures student motivation to apply critical thinking skills and reasoning to solve problems in five subscales: mental focus, learning orientation, creative problem solving, cognitive integrity, and …

Improving Student Retention Of Future Members Of The Science, Technology, Engineering, Mathematics, And Business Workforce, Samuel L. Rohr

All-Inclusive List of Electronic Theses and Dissertations

ThisDissertation examined the relationship between various admissions selection criteria utilized by a small, Liberal Arts College in the Midwest. More specifically, the study examined if a higher college preparatory GPA, a higher aggregate score on the SAT, attending a larger high school, and beginning college at an older age helped predict the retention of science, technology, engineering, mathematics, and business students. Data was gathered using historical enrollment data of 803 students. A logistic regression analysis was utilized to examine the impact of the four variables on retention of science, technology, engineering, mathematics, and business students. College preparatory GPA, the aggregate …