Digital Commons Network^™

Optical Method For High Magnification Imaging And Video Recording Of Live Cells At Sub-Micron Resolution, Jaime E. Romo Jr.

Theses and Dissertations

Optical microscopy, the most common technique for viewing living microorganisms, is limited in resolution by Abbe’s criterion. Recent microscopy techniques focus on circumnavigating the light diffraction limit by using different methods to obtain the topography of the sample. Systems like the AFM and SEM provide images with fields of view in the nanometer range with high resolvable detail, however these techniques are expensive, and limited in their ability to document live cells. The Dino-Lite digital microscope coupled with the Zeiss Axiovert 25 CFL microscope delivers a cost-effective method for recording live cells. Fields of view ranging from 8 microns to …

Optimizing Border Security With Stochastic And Deterministic Strategies, Gabriel A. Rueda

Theses and Dissertations

International trade and border security have always been linked together, and so has the need to find ways to improve security decisions. The United States and bordering countries benefit from the North American Free Trade Agreement (NAFTA), but amongst the positive effects of NAFTA there is a looming drug threat that effects the bi-national supply chains. In 2015 Customs and Border Protections (CBP) processed over 72,000 trucks, rail, and sea containers a day. CBP also seized 3.4 million pounds of narcotics, the majority of them at the ports of entry. With unknown threats using commercial vehicles to transport their illicit …

Knee Joint Internal Forces During Squat Jump Exercise, Ricardo Moreno

Theses and Dissertations

The purpose of this research is to investigate muscular ligament and joint contact forces produced during squat jump exercise. An inverse dynamics, two dimensional, leg model is used to describe the motion in the sagittal plane. The lower extremity model includes two bones, tibia and femur, tibio-femoral ligaments, and muscles such as quadriceps, hamstrings, and gastrocnemius. The ligaments are anatomically modeled as nonlinear strings, but the femoral condyle is modeled as a circle and the tibial plateau as a straight line. Experimental squat jump exercises are conducted to obtain the ground reaction forces, the angular accelerations, and centroid linear acceleration …

Study Of Selective Laser Remelting Of 316l S.S. To Reduce Roughness On Inclined Surface, Jafar Ghorbani

Theses and Dissertations

Additive manufacturing (AM) technologies are increasingly competing with subtractive methods, and there are promising applications for additive technologies that are hybrid with traditional manufacturing methods. Poor surface roughness of additive manufactured parts continues to be a major challenge especially for advanced functional parts. In this study, effect of processing parameters are evaluated, optimized and verified by using the Box–Behnken design of experiment method. The results, for the first time, reveal that surface remelting has the potential to become a high speed approach for improving the roughness of non-horizontal surface of additive manufactured parts.

Development Of A Fundamental Autonomous Ground Vehicle Cruise Control Using Matlab And Simulink, Luis F. Martinez

Theses and Dissertations

This study presents and describes the development of a fully autonomous vehicle cruise control system covering the vehicle dynamics and control design needed to simulate such system. It encompasses obstacle avoidance, intelligent-and-optimal lane change as well as adaptive behavior. This study offers a comprehensive two-dimensional cruise control with three degrees of freedom and it is designed using active obstacle avoidance controllers. It also includes optimized fuzzy logic for optimal vehicle trajectory and an extensive array of control law methodology. The end work shows a complete simulation run using MATLAB and Simulink.

Using Machine Learning To Predict Student Achievement On The State Of Texas Assessment Of Academic Readiness Examination In Charter Schools, Christopher D. Gonzalez

Theses and Dissertations

The purpose of this study was to research and develop a way to use machine learning algorithms (MLAs) to predict student achievement on the State of Texas Assessment of Academic Readiness (STAAR), specifically in the charter school setting. Charter schools have the disadvantage of a constant influx in students, so providing historical student data in order to analyze trends proves difficult. This study expands on previous research done on students in secondary and post-secondary school and determining features that indicate success in these settings. The data used is from the district of IDEA Public Schools who focuses on providing education …

Diazonium 4-(Trifluorovinyloxy) Perfluorobutanesulfonyl Benzenesulfonimide Zwitterionic Monomer Synthesis, Isaac D. Addo

Electronic Theses and Dissertations

3-Diazonium- 4-(trifluorovinyloxy) - perfluorobutanesulfonyl benzenesulfonimide zwitterionic monomer (see figure 1) is proposed to be polymerized and further act as a new electrolyte for Polymer exchange membrane fuel cells (PEMFCs). One reason is that, the aromatic trifluorovinyl aryl ether (TFVE) group can easily be homopolymerized to aromatic perfluorocyclobutane (PFCB) polymer. Furthermore, the diazonium moiety in the monomer is expected to covalently attach the electrolyte to the carbon electrodes support. The perfluoroalkyl(aryl) sulfonimide (PFSI) pendant provides good chemical and mechanical stability as well as better proton conductivity. Several multi-step synthetic schemes are designed to obtain such monomer from perfluoroalkyl(aryl) sulfonimide (PFSI). Among …

High-Impact Practices And Community College Completion Rates, Matthew H. Waters

Electronic Theses and Dissertations

The purpose of this study was to examine the associations between the 3-year completion rates of first-time, full-time, transfer degree-seeking community college students, participation in activities that may encourage persistence and retention, and the demographic variables of ethnicity, Pell grant recipiency, gender, and ACT or Compass subscores in English/writing, reading, and math/algebra. The researcher used a snapshot of students’ degree completion three academic years after initial enrollment to determine 3-year completion. The study focused on first-time, full-time students who were pursuing associate of arts or associate of science degrees at a nine-campus community college in eastern Tennessee. Students who were …

Twice Heard, Paradoxically (Un)Seen: Walking The Tightrope Of Invisibility In Palestinian Translated Fiction, Mona Nabeel Malkawi

Graduate Theses and Dissertations

This study examines the translators’ invisibility in postcolonial translated Palestinian fiction. On one hand, this analysis revolves around the ethical stance of translators towards authors in a postcolonial theoretical framework. On the other, it brings postcolonial translation scholars’ approaches into practice and examination. Therefore, this study provides a critical analysis of reading novels in translation as both a channel of decolonization from Oriental and imperial discourses and an aesthetic catalyst for freedom in exile, specifically translated by Trevor LeGassick, Elizabeth Fernea, Salma Jayyusi, Adnan Haydar, and Roger Allen. The intriguing paradox of the translator’s invisibility is inherent in the contradiction …

Homoeopathic Medicine Validation: Do It, But Do It Right!, Lex Rutten

Indian Journal of Research in Homoeopathy

No abstract provided.

Investigating The Effectiveness Of Digital-Based Concept Mapping On Teaching Educational Technology For Undergraduate Students, Abdelrahman Ahmed, Ahmed Abdelraheem

Journal of Educational and Psychological Studies

The purpose of this study was to investigate the effects of using digital-based concept mapping as strategy on students’ achievements and attitudes. Data was collected from 58 students enrolled in the course of ”Introduction to Educational Technology” in Instructional and Teaching Technologies Department at Sultan Qaboos University. Two sections out of four sections were selected randomly as the sample of the study. One of the sections was randomly chosen as experimental group (n = 27) and the other was control group (n = 31). Both pre- and post- achievement tests were used. The results of the study revealed that students …

Estimating Self And Spouse Intelligence Among Jordanians, Firas Al-Hamouri, Adnan Atoum, Mohammad Melhem, Hamzeh Rababa

Journal of Educational and Psychological Studies

The current study aimed at exploring self and spouse estimates of general and multiple intelligences among a sample of married Jordanian Students. Two-hundred and ten participants, recruited from Yarmouk and Al-Balqaa Universities, Jordan, completed a brief questionnaire based on those used in previous research which included an estimation of general IQ and each of the multiple intelligence sub-types. Results of the study partially replicated the results from other multiple intelligence self-estimate studies showing sex differences on general and logical intelligences, and confirmed previous research results that estimated verbal (linguistic) intelligence followed by numerical (logical) intelligence are the best significant predictors …

Control Of Matrix Metalloproteinases In A Periodontitis Model: Molecules That Trigger Or Inhibit Mmp Production, Catalina Matias Orozco

Theses and Dissertations

In periodontitis, there is a disruption in the homeostasis of the oral microbiome by peridontopathogenic bacteria. However, while bacteria is essential for periodontitis to occur, the severity, pattern and progression of the disease is not solely determined by the microbial burden, and in fact has a lot to do with the overwhelming host inflammatory response. The response can vary even in two individuals with similar periodontopathogenic profiles. The host response leads to extracellular matrix (ECM) destruction, loss of attachment, alveolar bone resorption and eventually, edentulism. The host's reaction is orchestrated by proinflammatory cytokines and chemokines and matrix metalloproteinases (MMPs). MMPs …

How A Systematic Approach To Uncertainty Quantification Renders Molecular Simulation A Quantitative Tool In Predicting The Critical Constants For Large N-Alkanes, Richard Alma Messerly

Theses and Dissertations

Accurate thermophysical property data are crucial for designing efficient chemical processes. For this reason, the Design Institute for Physical Properties (DIPPR 801) provides evaluated experimental data and prediction of various thermophysical properties. The critical temperature (T_c), critical density (ρ_c), critical pressure (P_c), critical compressibility factor (Z_c), and normal boiling point (T_b) are important constants to check for thermodynamic consistency and to estimate other properties. The n-alkane family is of primary interest because it is generally assumed that other families of compounds behave similarly to …

Accommodating Students Different Learning Styles With The Use Of Technology, Jaime Prieto

Capstone Projects and Master's Theses

The understanding of different learning styles is crucial for student academic success. The area of concentration pertaining to this topic includes the cognitive development during the adolescent age group selected. To create a good academic foundation, the teacher must exhibit different forms of learning styles to the students to create awareness and a good academic foundation. With the mass inclusion of technology in our society and education system, this research will attempt to understand the positive and negative effects of technology on effecting the students’ ability to use their effective learning style. Through the use of literature reviews and interviews …

The Phenomenon Of Gifted Underachievement In Saudi Arabia, Naif Alfurayh

Dissertations

The underachievement of high potential students is considered a significant issue in the field of gifted education in the United States. For decades, researchers have studied why gifted students fail to achieve at high levels in school; however, the research base on this topic is limited in most Middle Eastern countries and nonexistent in Saudi Arabia. Therefore, the purpose of this phenomenological, qualitative research study was to gain an understanding of the perceptions of gifted education teachers, parents of gifted children, and gifted coordinators in Saudi Arabia regarding the phenomenon of gifted students who underachieve in school. Three parents of …

A Monte Carlo Simulation Comparing The Statistical Precision Of Two High-Stakes Teacher Evaluation Methods: A Value-Added Model And A Composite Measure, Bryden Michael Spencer

Dissertations

Value-added models are a class of growth models used in education to assign responsibility for student growth to teachers or schools. For value-added models to be used fairly, sufficient statistical precision is necessary for accurate teacher classification. Previous research indicated precision below practical limits. An alternative approach has been explored in which value-added models are incorporated into composite measures of teacher quality alongside subjective indicators. The aim of the current research was to explore the relative precision of the two evaluative approaches using simulated data. It was found that the composite measure produced fewer classification errors than the stand-alone value-added …

The Bayesian Method Of Estimation For The Number Of Latent Classes In Growth Mixture Models, Chittanun Sitthisan

Dissertations

It is widely accepted that blindly specifying an incorrect number of latent classes may result in misidentifying the class membership of observations and in inconsistently estimated parameters. The current dissertation examined the Bayesian method to estimate the number of latent classes in growth mixture models. The procedure for estimating the number of latent classes was developed via Markov chain Monte Carlo using the Metropolis-Hastings algorithm. The key idea was to construct the likelihood function and then specify the prior information toward the number of latent classes (K), and then calculate the posterior distribution for K. Simulated observations were generated by …

Associations Between Teacher Interactional Quality And Student Achievement: A Classroom-Level Analysis Of Randomized And Non-Randomized Teacher Assignments In The Measure Of Effective Teaching Project, Chelsie Amber Hess

Dissertations

The powerful role teachers have on students’ learning and academic performance has been well established in the empirical literature. However, researchers have not been successful in explaining what exactly it is about teachers that foster students’ academic success in the classroom. The premise of this dissertation was that teachers who provide affirming, supportive, and organized interactions, also known as teacher interactional quality, have beneficial effects on students’ academic achievement. This dissertation used the largest education dataset of United States students, known as the Measures of Effective Teaching (MET), to examine the association of teacher interactional quality on classroom achievement. The …

Faculty's Knowledge, Pedagogy, And Integration Levels In The Implementation Of Ipads As An Instructional Tool, Xin Wang

Dissertations

Current literature showed there is a need to help faculty improve their iPad integration practices. Using a sequential mixed-methods design, the researcher explored the relationship among faculty’s iPad integration levels, their teachers’ knowledge (TPACK), and pedagogy among faculty members who had integrated iPads into their teaching for at least two semesters. The data were collected with a cross-section questionnaire, follow-up interviews and artifacts. Responses were collected respectively with the three sections of the questionnaire: iPad Usage (N=160), TPACK (N=151), and demographics (N=147). Eight participants were interviewed after the survey. The results indicated TPACK and learning-centered pedagogy were necessary but insufficient …

The Economy Of Preventive Maintenance Of Concrete Bridges Due To Corrosion, Haotian Zhang

Dissertations - ALL

The current practice for physical evaluation and delayed maintenance of deteriorated concrete bridge is fundamentally wrong. This research presents a new approach for the evaluation of the condition states of steel reinforced concrete bridge members, which is based on their chemical conditions instead of the physical deficiencies such as cracks and delamination. Using the proposed chemical based inspection approach, a more effective and economic preventive maintenance plan could be achieved. The available non-destructive evaluation (NDE) methods and preventive maintenance measure are identified. Since the chloride induced corrosion is the major factor that dictates the service life of the steel reinforced …

Perceptions Of School Readiness, Developmentally Appropriate Practices, And The Role Of Professionalism, Brittany Kristine Mcallister

Electronic Theses, Projects, and Dissertations

Research supports the knowledge that there exist many models on and definitions of school readiness within early education. Additionally, research shows that utilizing developmentally appropriate practices (DAP) produces positive short and long term results for students; indicating the effectiveness and necessity for DAP in the classroom. The study sought to inform teachers via presentation on the subjects of school readiness and DAP; as well as gain insight on the barriers teachers face in utilizing their school readiness and DAP knowledge base in the classroom. To accomplish this, the study used a pre-survey, presentation with discussion, and a post-survey to collect …

Planar Graphs, Biplanar Graphs And Graph Thickness, Sean M. Hearon

Electronic Theses, Projects, and Dissertations

A graph is planar if it can be drawn on a piece of paper such that no two edges cross. The smallest complete and complete bipartite graphs that are not planar are K5 and K{3,3}. A biplanar graph is a graph whose edges can be colored using red and blue such that the red edges induce a planar subgraph and the blue edges induce a planar subgraph. In this thesis, we determine the smallest complete and complete bipartite graphs that are not biplanar.

Computational Quantum Chemistry Studies Of The Stabilities Of Radical Intermediates Formed During The Oxidation Of Melatonin, Constance E. Warden

Electronic Theses and Dissertations

Melatonin, a nontoxic natural antioxidant, is of interest as a possible spin trap for use in spectroscopic methods to observe and identify short-lived free radicals, which have been linked to oxidative stress that may result in serious health problems. However, the reaction mechanisms for the oxidation of melatonin to form the product N¹-acetyl-N²-formyl-5-methoxykynuramine are still not well understood. Computational quantum chemistry studies have been done on four proposed reaction mechanisms, involving the following major intermediate structures: a dioxetane, an epoxide, a melatonin radical cation, and a spin radical adduct. Molecular geometries were optimized at the …

A Multi-Indexed Logistic Model For Time Series, Xiang Liu

Electronic Theses and Dissertations

In this thesis, we explore a multi-indexed logistic regression (MILR) model, with particular emphasis given to its application to time series. MILR includes simple logistic regression (SLR) as a special case, and the hope is that it will in some instances also produce significantly better results. To motivate the development of MILR, we consider its application to the analysis of both simulated sine wave data and stock data. We looked at well-studied SLR and its application in the analysis of time series data. Using a more sophisticated representation of sequential data, we then detail the implementation of MILR. We compare …

The Development And Evaluation Of Lecture Tutorials For Introductory Soil Science, Judith K. Turk

Conservation and Survey Division: Faculty and Staff Publications

The wide-array of concepts from the natural sciences that must be mastered to succeed in an introductory soil science course presents a significant challenge to students. This study was conducted to determine if students’ conceptual development regarding topics in introductory soil science could be improved by using lecture tutorials. Lecture tutorials are activities that students complete following a lecture. They guide the students to critically analyze their understanding of a concept presented in the lecture. Eight lecture tutorials were written and evaluated using pre/post quizzes and surveys in two courses (an environmental science program course and a general studies course). …

Modeling The Effects Of Tile Drain Placement On The Hydrologic Function Of Farmed Prairie Wetlands1, Brett Werner, John Tracy, W. Carter Johnson, Richard A. Voldseth, Glenn R. Guntenspergen, Bruce Millett

United States Geological Survey: Staff Publications

The early 2000s saw large increases in agricultural tile drainage in the eastern Dakotas of North America. Agricultural practices that drain wetlands directly are sometimes limited by wetland protection programs. Little is known about the impacts of tile drainage beyond the delineated boundaries of wetlands in upland catchments that may be in agricultural production. A series of experiments were conducted using the well-published model WETLANDSCAPE that revealed the potential for wetlands to have significantly shortened surface water inundation periods and lower mean depths when tile is placed in certain locations beyond the wetland boundary. Under the soil conditions found in …

Development Of Fully Printed And Flexible Strain, Pressure And Electrochemical Sensors, Dinesh Maddipatla

Masters Theses

In recent years, considerable research has been put into the development of printed electronics (PE) as well as the best ways to effectively and efficiently print electronic devices on flexible substrates. This thesis focuses majorly on the design and fabrication of novel flexible sensors using conventional printing processes.

Initially, a flexible printed strain gauge was fabricated successfully on a flexible paper substrate using flexography printing process. Silver (Ag) ink was printed on the paper substrate as metallization layer. The performance of the printed device was investigated by subjecting the strain gauge to a 3-point bend test, with a displacement of …

Optimal Design Of Automotive Exhaust Thermoelectric Generator (Aeteg), Hassan Fagehi

Masters Theses

A consumption of energy continues to increase at an exponential rate, especially in terms of automotive spark ignitions vehicles. About 40% of the applied fuel into a vehicle is lost as waste exhaust to the environment. The desire for improved fuel efficiency by recovering the exhaust waste heat in automobiles has become an important subject. The thermoelectric generator (TEG) has the potential to convert exhaust waste heat into electricity as long as it is improving fuel economy. The remarkable amount of research being conducted on TEGs indicates that this technology will have a bright future in terms of power generation. …

Analytical Study Of Miniature Thermoelectric Device, Mohammed Dhannoon

Masters Theses

Miniature thermoelectric devices (TE) have been regarded as hopeful devices to attain efficient cooling in microprocessors and other small-scale devices. To recognize the performances of miniature thermoelectric coolers, a thermoelectric cooling module is theoretically analyzed. Particular attention is paid to the impact of the thermoelectric element length effect and the substrate material type influence on the cooling performance. The electrical contact resistance and thermal contact are taken into account.

Furthermore, miniature thermoelectric is compared with large thermoelectric, and effective material properties of miniature thermoelectric are studied. The obtained results also demonstrate power density (cooling/heating power per unit area of the …