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2021

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New Numerical Approximations Of Geological Processes In Heterogeneous Systems Using Radial Basis Functions, Nadun Lakshitha Dissanayake Kulasekera Mudiyanselage Jan 2021

New Numerical Approximations Of Geological Processes In Heterogeneous Systems Using Radial Basis Functions, Nadun Lakshitha Dissanayake Kulasekera Mudiyanselage

Dissertations, Master's Theses and Master's Reports

This dissertation includes four chapters. A brief description of each chapter is organized as follows. The first chapter provides an introduction to the RBF method. The chapter follows the historical progression of the Radial Basis Function (RBF) method while outlining the method’s advantages and disadvantages. A brief introduction about RBF interpolation, the RBF-FD method, and how to use it to solve PDEs is provided. Chapter 2 introduces a novel computationally efficient RBF-FD algorithm to solve the groundwater flow equation in the presence of an active well. We show that our method analytically handles the singularities in the PDE caused by …

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Predictors Of Academic Performance: The Roles Of Self-Compassion, Coping, Mental Toughness, Grit, And Self-Reported Stressors On Physics Final Exam Performance, Darnishia L. Morris Jan 2021

Predictors Of Academic Performance: The Roles Of Self-Compassion, Coping, Mental Toughness, Grit, And Self-Reported Stressors On Physics Final Exam Performance, Darnishia L. Morris

Dissertations, Master's Theses and Master's Reports

The intersection of stress, persistence and success in college-aged students is progressively gaining attention in research. Analyzing how students succeed and what factors contribute to their success, failure, and ultimately the completion of their degree, is vitally important for educators and administrators in higher education to understand. Historically utilized factors such as grade point average (GPA), standardized test scores (college admissions and Advance Placement (AP) exams), and previous academic achievement (pre-requisite courses) are not the only predictors of academic performance. This study aimed to quantify contributions and inter-relationships of student perceptions, coping style, stress, mental toughness (MT), and other potential …

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The Effects Of Molybdenum, Chromium, And Niobium On Gray Iron For Brake Rotor Applications, Matthew Hasbrouck Jan 2021

The Effects Of Molybdenum, Chromium, And Niobium On Gray Iron For Brake Rotor Applications, Matthew Hasbrouck

Dissertations, Master's Theses and Master's Reports

Brake rotor composition and microstructure must be optimized for thermal and mechanical performance to avoid thermal-mechanical cracking, excessive wear, and to reduce noise. Niobium is an element that increases the strength and wear resistance of gray iron; however, the interaction of niobium with other common alloying elements (chromium and molybdenum) is not well understood. Thirteen gray cast iron alloys were produced with varying levels of carbon equivalent (CE), Cr, Mo, and Nb. Bars with four different diameters (8, 14, 22, and 30 mm) were cast from each alloy and microstructural and physical properties such as graphite flake morphology, pearlite spacing, …

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