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Infrared And Fluorescent Thermal Imaging And Thermal Transport Characterization Of Engineering Devices And Systems, Swapnil Suryakant Salvi Aug 2022

Infrared And Fluorescent Thermal Imaging And Thermal Transport Characterization Of Engineering Devices And Systems, Swapnil Suryakant Salvi

Mechanical and Aerospace Engineering Dissertations - Archive

Infrared (IR) thermal imaging is widely used for non-contact temperature measurement in engineering. IR camera detects thermal emissions from the target surface in a certain wavelength range, which, using the known surface emissivity, can be converted to a pixel-by-pixel temperature map. Fluorescence imaging also works along similar lines. This Ph.D. dissertation contributes towards thermal imaging and thermal transport characterization in engineering devices/systems using infrared and fluorescence imaging. In the first two parts of this work, infrared thermal imaging is used for measuring thermal conductivity of thin wires and for spotting unusual activities in a three-dimensional integrated circuit (3D IC). In …

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In-Situ Observation Of Extrusion Process In Thermoplastic Material Extrusion Based Additive Manufacturing, Ye Hong Aug 2022

In-Situ Observation Of Extrusion Process In Thermoplastic Material Extrusion Based Additive Manufacturing, Ye Hong

Mechanical and Aerospace Engineering Dissertations - Archive

In thermoplastic material extrusion-based additive manufacturing, solid polymer filaments are fed into extruders to generate extrudates that are needed to build 3D plastic products. There is a finite gap between the inner surface of an extruder and the edge of a filament. This gap facilitates the insertion and translation of the filament inside the extruder. However, it is still not clear how the gap is filled during the extrusion. The lack of this information makes it difficult to model the temperature distribution and flow profile during the extrusion. In this work, we built experimental apparatus to directly observe the gap-filling …

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Multi-Objective Aero/Mechanical Design Optimization Of Gp Turbine Blades Platform Contour Using Adjoint Solver And Impact On Secondary Losses, Mostafa Soliman Aug 2022

Multi-Objective Aero/Mechanical Design Optimization Of Gp Turbine Blades Platform Contour Using Adjoint Solver And Impact On Secondary Losses, Mostafa Soliman

Mechanical and Aerospace Engineering Dissertations - Archive

Gas Turbines Hot Gas Path components represent the major contribution to generating power in Gas Turbines They are the components that mainly extract power from hot gasses that come out of the combustion Chamber (Combustor). Due to harsh temperature and environment, these components are vulnerable to high thermal and mechanical stresses which affect its durability, life, and efficiency. Hot Gases go through these components can reach very high max temperature. Max blade alloy metal temp in Gas Path blades can reach 1800-1900 F. Because of these severe operation conditions, a very careful prediction of stresses, thermal distribution, losses and flow …

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Cold Plate Based Dynamic Liquid Cooling At Data Center And Chip Level, Pardeep Shahi Aug 2022

Cold Plate Based Dynamic Liquid Cooling At Data Center And Chip Level, Pardeep Shahi

Mechanical and Aerospace Engineering Dissertations - Archive

The rising demand for high-performance central and graphical processing units has resulted in the need for more efficient thermal management techniques like direct-to-chip liquid cooling. Direct Liquid Cooling using cold plates is one of the most efficient and investigated cooling technology since the 1980s. Major data and cloud providers like IBM, Microsoft, and Google are actively deploying liquid-cooled data center infrastructure due to rising computational demands but its performance and efficiency can be further be enhanced using dynamic cooling technologies. At the chip level since the early ’60s, based on Moore’s law, transistor density has been doubling every generation resulting …

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Interactions Of Vortices With Differing Creation Mechanisms In The Wake Of A Normal Flat Plate-Delta Flat Plate Couple: A Numerical Study., Cheruvateth Vivek Nair Aug 2022

Interactions Of Vortices With Differing Creation Mechanisms In The Wake Of A Normal Flat Plate-Delta Flat Plate Couple: A Numerical Study., Cheruvateth Vivek Nair

Mechanical and Aerospace Engineering Dissertations - Archive

ABSTRACT: Fluid flow is characterized by the presence of various coherent vortical structures such as vortex tubes, vortex streets, and eddies. When these vortical structures interact with each other or other distinct mechanisms in a fluid, they form a chaotic region of mixing where a large transfer of mass and energy is observed; This phenomenon is called a vortex interaction and is commonly observed in nature across large Reynolds number regimes. In engineering, vortex interactions are an important topic of research in areas such as mixing, flow induced vibrations, propulsion, aerodynamics, convection, heat island effects, hydrodynamics, and atmospheric Sciences, to …

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Fixed Wing Aircraft Collision Avoidance Using Collision Cone Theory, Andrew T. Iii Beary Aug 2022

Fixed Wing Aircraft Collision Avoidance Using Collision Cone Theory, Andrew T. Iii Beary

Mechanical and Aerospace Engineering Theses - Archive

This thesis develops the guidance and control components of an aircraft collision avoidance system, using a collision cone-based approach. These guidance and control laws are developed by considering the nonlinear relative kinematic equations of the aircraft that are on a collision course, as well as the nonlinear flight dynamics of the aircraft performing the collision avoidance maneuver. The longitudinal and lateral-directional axes of the aircraft are considered separately. The developed guidance and control laws are subsequently integrated with the nonlinear aircraft dynamics in a MATLAB/Simulink framework, and simulations performed to demonstrate the working of the overall system.

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Study Of Electron Energy Filtering For Cold Electron Transport At Room Temperature, Pushkar Kiran Gothe Aug 2022

Study Of Electron Energy Filtering For Cold Electron Transport At Room Temperature, Pushkar Kiran Gothe

Material Science and Engineering Dissertations - Archive

The Fermi-Dirac thermal excitation of electrons at room temperature has been a significant limitation to many technologically important phenomena such as single electron transport. The electron thermal excitation also degrades the performance of modern electronic devices as well as spintronic devices. The scaling of metal-oxide-semiconductor field-effect transistors (MOSFETs) is hindered due to the thermal excitation of electrons at room temperature. Suppression of the thermally excited electrons at room temperature would therefore enable further scaling of the transistors, and in turn, improve the performance of electronic devices. This study demonstrates the suppression of electron thermal excitation at room temperature without using …

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Hierarchical Microstructures To Overcome The Conflict Between Strength And Toughness Of Hard Coatings: Tin/Ni As A Model System, Ignacio Lopez Cabanas Aug 2022

Hierarchical Microstructures To Overcome The Conflict Between Strength And Toughness Of Hard Coatings: Tin/Ni As A Model System, Ignacio Lopez Cabanas

Material Science and Engineering Dissertations - Archive

In the recent times, industry's production speed has been increasing and thus, the production of parts needs to adapt and so do the materials used to manufacture them. Hence, tools exposed to more extreme conditions using hard coatings need them to be more reliable. In this work an improvement of the toughness of TiN/Ni coatings is achieved through the combination of different microstructures at different levels. This first part consisted on finding the optimum TiN/Ni composition by using a high throughput methodology for a faster analysis and the second on the combination of that composition with a multilayer structure to …

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Researching Appointment Robbery: Voices From The Street, Arthur Gregory Vasquez Aug 2022

Researching Appointment Robbery: Voices From The Street, Arthur Gregory Vasquez

Public Affairs Dissertations - Archive

This dissertation is composed of three papers that will examine three topics related to the main research project of examining whether or not CPTED strategies have an effect on the decision to participate in appointment robbery. The first paper examines the difficulties in gaining access with the hard-to-reach population of active offenders. The second paper will provide examples of ethical dilemmas that the qualitative researcher faced while in the field. The third paper will explore whether or not criminals were deterred from deciding to engage in criminal activity due to an implementation of a CPTED strategy. These three papers together …

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Meaning-Mating And Hyphenated Actualizing In Individual-Organization Units: Lived Experiences Of Organization Development Practitioners Learning And Carrying Out The Philosophy Of Organization Development, Brian Lee Chapman Aug 2022

Meaning-Mating And Hyphenated Actualizing In Individual-Organization Units: Lived Experiences Of Organization Development Practitioners Learning And Carrying Out The Philosophy Of Organization Development, Brian Lee Chapman

Business Administration Dissertations - Archive

Individuals have been organizing for millennia. The purpose of this study was to investigate what it means for individuals and organizations to each experience how an exposure to the instrumentalized philosophies of one impacts the internalized philosophies of the other. This phenomenological investigation focused on the lived experiences of Organization Development (OD) practitioners with learning and carrying out the philosophy of OD. Individual conversations with six participants during fourteen separate interview sessions were phenomenologically carried out, analyzed, and interpreted. The experiences articulated during these conversations elucidate two concepts not found during the literature review – meaning-mating and hyphenated actualization. These …

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Three Essays On Political Contributions And Firm Performance, Ankita Damani Aug 2022

Three Essays On Political Contributions And Firm Performance, Ankita Damani

Finance and Real Estate Dissertations - Archive

The interaction of politics with financial markets and the macroeconomy has received increasing attention in recent years. Extant literature identifies the significant impact of political connections on firm value. However, several questions in this area remain unanswered. My dissertation consists of three essays. In the first essay, I examine the impact of economic policy uncertainty (EPU) on total campaign contributions and the relative contributions to Republicans and Democrats. I find that the total Political Action Committee (PAC) contributions by firms increase following an increase in EPU. This is also true for the contributions to each major political party, i.e., Republicans …

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Researching Appointment Robbery: Voices From The Street, Arthur Gregory Vasquez Aug 2022

Researching Appointment Robbery: Voices From The Street, Arthur Gregory Vasquez

Business Administration Dissertations - Archive

This dissertation is composed of three papers that will examine three topics related to the main research project of examining whether or not CPTED strategies have an effect on the decision to participate in appointment robbery. The first paper examines the difficulties in gaining access with the hard-to-reach population of active offenders. The second paper will provide examples of ethical dilemmas that the qualitative researcher faced while in the field. The third paper will explore whether or not criminals were deterred from deciding to engage in criminal activity due to an implementation of a CPTED strategy. These three papers together …

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Managers’ Political Ideology And Debt, Abdulaziz Alshamrani Aug 2022

Managers’ Political Ideology And Debt, Abdulaziz Alshamrani

Finance and Real Estate Dissertations - Archive

This dissertation investigates the effect of managers’ political ideology and their level of managerial conservatism on their firms in the credit markets. In particular, we present three studies on the effect of managers’ political ideology and conservatism on loans’ spreads, credit ratings, and borrower-lender homophily. The level of executive's conservatism is inferred from their direct form of political donations. In chapter I, we provide an introduction that includes an overview and a background to motivate our research. In chapter II, we examine the effect of top managements’ conservatism on their firms' cost of bank loans. We find that firms with …

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Three Essays On International Mutual Fund Flows, Anh Tuan Nguyen Aug 2022

Three Essays On International Mutual Fund Flows, Anh Tuan Nguyen

Finance and Real Estate Dissertations - Archive

In this dissertation, I investigate the comprehensive relationship of international mutual fund flows among markets. While my first essay presents the unprecedent findings of commonality in mutual fund flows and global market integration, my second essay focuses on answering the classic question in financial market: is there any contagion in the market for asset management? In the third essay, I examine the intransitivity puzzle presented in the first essay. In the first essay, I examine global integration in the market for asset management, as indicated by the correlation of mutual fund flows across domiciles. I observe no leading role for …

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Novel Nanoparticles To Stimulate Therapeutic Angiogenesis For The Treatment Of Peripheral Arterial Diseases, Tam Phung Nguyen Aug 2022

Novel Nanoparticles To Stimulate Therapeutic Angiogenesis For The Treatment Of Peripheral Arterial Diseases, Tam Phung Nguyen

Bioengineering Dissertations - Archive

Peripheral arterial disease (PAD) is a severe impairment of arterial vessels resulting in obstruction of normal blood flow in the legs, leading to acute or chronic lower limb ischemia and subsequently high morbidity and mortality rates. Common treatments for PAD, such as medications and surgical revascularization, have several limitations. For instance, medications used to lower cholesterol, reduce high blood pressure, control blood sugar, prevent blood clots, and reduce/delay symptoms such as leg pains. Still, they cannot treat the established disease directly and often cause side-effects, including bleeding, headache, and diarrhea. Meanwhile, many elderly PAD patients cannot undergo surgical options. Therefore, …

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Engineering Elastic And Functional Electrospun Nano-Fibers For Potential Heart Repair, Alan Mark Taylor Aug 2022

Engineering Elastic And Functional Electrospun Nano-Fibers For Potential Heart Repair, Alan Mark Taylor

Bioengineering Dissertations - Archive

In the United States and around the world, cardiovascular disease (CVD) has been one of the main causes of death since 1921, responsible for approximately 1 in 4 deaths domestically. Myocardial infarction (MI), or commonly called a heart attack, is a subset of CVD that often ends in heart failure (HF). Cardiac cells are incapable of regeneration, leading to severe impacts on quality of life. Current treatments for MI fail to target left ventricular remodeling and therefore do little to address the progression towards HF. Cardiac scaffolds for tissue engineering (TE) are a prominent solution in recent research. Developing various …

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Advancing The Radiation Oncology Clinic With Motion Management And Automatic Treatment Planning, Damon Anton Sprouts Aug 2022

Advancing The Radiation Oncology Clinic With Motion Management And Automatic Treatment Planning, Damon Anton Sprouts

Bioengineering Dissertations - Archive

The leading cause of premature death (death under the age of 70) is cancer. The top five cancers for both male and female are: lung, colorectum, pancreas, breast cancer, and prostate. In 2020 there was an estimated 19.3 million new cases with an estimated 9.9 million deaths. The cancer burden is expected to grow to 28.4 million by the year 2040. Surgery, chemotherapy, and radiotherapy are the three pillars in the modern clinic for cancer treatment. In radiotherapy, ionizing radiation particles can travel through the patient body, deposit energy along the way and damage the DNA Structure. There needs to …

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Electrophysiological, Hemodynamic, And Metabolic Effects Of Transcranial Photobiomodulation (Tpbm) On Topographical And Physiological Connectivity In The Human Brain, Sadra Shahdadian Aug 2022

Electrophysiological, Hemodynamic, And Metabolic Effects Of Transcranial Photobiomodulation (Tpbm) On Topographical And Physiological Connectivity In The Human Brain, Sadra Shahdadian

Bioengineering Dissertations - Archive

Transcranial photobiomodulation (tPBM) targets the human brain with near-infrared (NIR) light and is shown to affect human cognitive performance and neural electrophysiological activity as well as concentration changes of oxidized cytochrome-c-oxidase ([CCO]) and hemoglobin oxygenation ([HbO]) in human brain. Brain topographical connectivity, which shows the communication between regions of the brain, and its alteration can be assessed to quantify the effects of external stimuli, diseases, and cognitive decline, in resting-state or task-based measurements. Furthermore, understanding the interactions between different physiological representations of neural activity, namely electrophysiological, hemodynamic, and metabolic signals in the human brain, has been an important topic among …

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The High Cost Of Leaving: Veteran Teachers In Islamic Schools, Hanan Almasri Aug 2022

The High Cost Of Leaving: Veteran Teachers In Islamic Schools, Hanan Almasri

Educational Leadership & Policy Studies Dissertations - Archive

Utilizing a traditional qualitative approach, this study explored the experiences of veteran teachers in Islamic private schools and their retention decisions through the lens of the job embeddedness framework, which examines the attachment factors that keep people in their positions through three distinct dimensions (Links, Fit, and Sacrifice) The participants in this study include eight veteran teachers with five or more years’ experience teaching at the same school and two current principals. The study site is a private, well-established, K-12 Islamic school in North Texas. The participants engaged in semi-structured, in-depth interviews to share their motivations for remaining at their …

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Multisorb: A Low-Cost Approach To Remove Multiple Metals And Organics From Leachate And Wastewater, Mithila Chakraborty Aug 2022

Multisorb: A Low-Cost Approach To Remove Multiple Metals And Organics From Leachate And Wastewater, Mithila Chakraborty

Civil Engineering Dissertations - Archive

ABSTRACT: Landfill leachates are considered now as a reusable source of water. Even irrigation projects are now considering use of non-traditional water sources, including treated wastewater, to augment supplies. Treated wastewater or leachate, however, may still contain many inorganic and organic pollutants of emerging concern, because traditional wastewater treatment plants are unable to remove all of them. Adsorbents have been demonstrated to effectively remove heavy metals and recalcitrant organics from leachate/wastewater more effectively, at lower cost, and using less chemicals and energy than many competing techniques. A single adsorbent with one pre-treatment, however, is not effective for simultaneously removing different …

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Design Of Crack Attenuating Mix Using Waste Plastic, Shruti Singh Aug 2022

Design Of Crack Attenuating Mix Using Waste Plastic, Shruti Singh

Civil Engineering Dissertations - Archive

Plastic has many good properties such as inexpensiveness, light weightedness and durability, but it comes with one major catch i.e., its ‘indestructibility’. Plastic waste is now omnipresent and highlights that all plastic ever produced still exists in some shape or form either as macro, micro or nano plastics, making it one of the greatest challenges our planet is facing today. At the same time many existing pavements are experiencing structural and functional deficiencies due to rapid growth in traffic volume. This has led to an ever-increasing rise in construction and rehabilitation cost. So, an alternative has been explored through this …

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Identifying The Optimal Combination Of Critical Roadside Slope Segments Susceptible To Rainfall-Induced Failures For Minimizing Vulnerability Of Highway Networks, Anil Baral Aug 2022

Identifying The Optimal Combination Of Critical Roadside Slope Segments Susceptible To Rainfall-Induced Failures For Minimizing Vulnerability Of Highway Networks, Anil Baral

Civil Engineering Dissertations - Archive

The stability of roadside slopes is vital for the smooth operation of the highway transportation system. The failure of slopes adjacent to the highway corridors adversely impacts the network users and network operators. The network users are subjected to delays through speed restrictions, stoppage, and diversions due to the blockage of a motorway. The network operators face the burden of implementation and finance of emergency slope repairs. Proactive rehabilitation of slopes helps to reduce roadside slope failures and minimize the disruption of transportation networks resulting from rainfall-induced slope failures. However, all the slope segments susceptible to rainfall-induced failures cannot be …

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Three Essays Examining Organizational Influences On Employee Identity Construction, Esther Lamarre Jean Aug 2022

Three Essays Examining Organizational Influences On Employee Identity Construction, Esther Lamarre Jean

Management Dissertations - Archive

Identity consists of the roles and expectations individuals use to define their self. My dissertation examines the effects of individual perceptions around how identities are constructed in organizations on employee outcomes, decisions, and experiences. In a three-essay format, I develop the construct of identity work supportive organizational support (IWSOP) and a scale to measure it, evaluate how IWSOP relates to affective commitment for employees, and examine whether IWSOP might affect job choice decisions. IWSOP is conceptualized as the degree to which employees perceive that their organization encourages, allows, or provides the opportunity to think about, talk about, or display aspects …

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Artificial Intelligence (Ai) In Employee Selection: How Algorithm-Based Decision Aids Influence Recruiters’ Decision-Making In Resume Screening, Dan Chen Aug 2022

Artificial Intelligence (Ai) In Employee Selection: How Algorithm-Based Decision Aids Influence Recruiters’ Decision-Making In Resume Screening, Dan Chen

Management Dissertations - Archive

With the development of artificial intelligence (AI), algorithm-based decision aids have been adopted by more and more organizations to help recruiters and hiring managers screen and review job candidates. This dissertation assesses how HR recruiters integrate selection information produced by algorithms into assessments of job candidates’ qualifications to make the hiring decisions. To assess how algorithm-based decision aids are used, I first investigate how individual characteristics of recruiters influence their perceived usefulness of algorithm selection information. I then examine how recruiters rate applicant employability when they are given different types of jobs (HR Assistant vs. Data Engineer) and algorithm-based selection …

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Customer Mistreament, Third Party Observers, And Emotional Labor: An Exploration Of The Phenomenon Of Breaking Character, Nicolina Leeann Taylor Aug 2022

Customer Mistreament, Third Party Observers, And Emotional Labor: An Exploration Of The Phenomenon Of Breaking Character, Nicolina Leeann Taylor

Management Dissertations - Archive

The emotional labor literature is vast and complex. Overwhelmingly, most studies focus on surface acting and deep acting. Breaking character, expressing true, negative emotions to a customer, is understudied, despite evidence of occurring frequently. Despite conceptual work stating that breaking character produces negative outcomes, empirical work is scant. Further, the impact that breaking character has on employees is unknown. In summary, researchers know very little regarding what leads to breaking character, how employees feel about breaking character, and the aftermath of breaking character. Thus, the purpose of this dissertation is to explore the phenomenon of breaking character. First, I qualitatively …

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Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current, Qazi Ashique E Mowla Aug 2022

Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current, Qazi Ashique E Mowla

Civil Engineering Dissertations - Archive

This thesis concerns the unique flow structure around bridge piers under the wave and current conditions. The flow characteristics around piers may change depending on the flow conditions and geometry of the pier. These flow structures imprint themselves on the streambed as scour holes. Laboratory experiments were conducted to investigate the changes that occur in the flow pattern and in the geometric pattern of scour holes around piers in waterbodies subject to waves and currents. Physical models of two piers with different diameters (19 mm and 50 mm) were built and installed in a sediment bed. A total of 19 …

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Integrating Environmental Contamination Perceptions Of Artisanal And Small-Scale Mining Into Environmental Responses Across Spatial Scales, Michelle Schwartz Aug 2022

Integrating Environmental Contamination Perceptions Of Artisanal And Small-Scale Mining Into Environmental Responses Across Spatial Scales, Michelle Schwartz

Civil Engineering Dissertations - Archive

ABSTRACT: Artisanal and small-scale gold mining (ASGM) is of significant interest to the international research community, government officials, and non-governmental organizations due to its large environmental footprint and its presence in over 70 countries worldwide. Despite the health and environmental concerns associated with mercury use in ASGM and the increased awareness at the international level, attempts to address environmental contamination has faced resistance as they often fail to account for the real-world conditions at sites of concern. Additionally, national and international interventions have fallen short when addressing ASGM pollution, calling for a new engineering approach towards ASGM-related projects. The purpose …

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Development Of Multi Criteria Decision-Making Model To Evaluate The Adoption Effectiveness Of Electronic Ticketing (E-Ticketing) In Highway Construction Projects, Karthik Subramanya Aug 2022

Development Of Multi Criteria Decision-Making Model To Evaluate The Adoption Effectiveness Of Electronic Ticketing (E-Ticketing) In Highway Construction Projects, Karthik Subramanya

Civil Engineering Dissertations - Archive

Highway and bridge construction projects are subject to cost and schedule overruns, as well as workforce shortages in remote locations, both of which can result in disputes over the quality of the end product. State departments of transportation (DOTs) are constructing and managing more highway projects than ever before despite limited funds and a shortage of inspectors. The construction of highway infrastructure has devoted significant resources towards e-Construction to reduce the paperwork and automate the tasks in daily operations. Electronic Ticketing (e-Ticketing) is one such component of e-Construction that aids in the digital transfer of material tickets such as asphalt …

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Nanopetrophysical Characterization Of The Upper Mancos Shale In The San Juan Basin, New Mexico, U.S.A., Ann Kiat Gan Aug 2022

Nanopetrophysical Characterization Of The Upper Mancos Shale In The San Juan Basin, New Mexico, U.S.A., Ann Kiat Gan

Earth & Environmental Sciences Theses - Archive

The San Juan Basin is no stranger to oil and gas production and the Mancos Shale is one of the formations of the basin that had been producing petroleum since the early 1920’s as conventional, and recently as, unconventional resources. Due to the economic significance of shale oil and gas production, oil and gas companies have a strong motivation to understand the petrophysical property measurements of shale reservoirs, in this case, the Upper Mancos Shale, both in the laboratory and in the subsurface. By understanding shale petrophysics, such as total organic carbon, mineral composition, wettability, porosity, permeability, pore connectivity for …

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Academic Integration And Self-Regulation Strategies In Precalculus And Calculus I, Kyle Russell Turner Aug 2022

Academic Integration And Self-Regulation Strategies In Precalculus And Calculus I, Kyle Russell Turner

Mathematics Dissertations - Archive

This case study examines the self-regulation strategies and academic integration of first-semester undergraduate students enrolled in precalculus and first-semester calculus at a large urban university in the southwestern United States. I use a sequence of interviews to examine the relationship of mathematics self-efficacy and mathematics identity on students’ use of these strategies. Five interviews occurred during the Fall 2021 semester with three precalculus and six calculus students, and I distributed initial surveys to thirteen first-semester calculus sections and five precalculus sections. To analyze the data, I integrated frameworks from Zimmerman and Pons (1986) and Wolters (1998) on the self-regulation strategies …

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