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Title: A STUDY ON FLUID-STRUCTURE INTERACTION OF SWIMMING BEAM USING IMMERSED BOUNDARY- LATTICE BOLTZMANN METHOD
Creator: Rahman, Md Towhidur
Date: 2021
Collection: Electronic Theses & Dissertations
Description: Fluid-structure interaction (FSI) study is of great importance to understand the hydrodynamic coupling of biological swimmers in surrounding environmental domain. Multiple numerical and experimental studies have taken place to capture the behavioral pattern from the environment, explore the physical phenomena and comprehension of dynamics to make contribution in real life applications. In this study, an immersed boundary-lattice Boltzmann method (IB-LBM) for fluid-structure interaction...
Show moreFluid-structure interaction (FSI) study is of great importance to understand the hydrodynamic coupling of biological swimmers in surrounding environmental domain. Multiple numerical and experimental studies have taken place to capture the behavioral pattern from the environment, explore the physical phenomena and comprehension of dynamics to make contribution in real life applications. In this study, an immersed boundary-lattice Boltzmann method (IB-LBM) for fluid-structure interaction problems is presented. The impact of solid structure on to the surrounding fluid domain is dealt with by immersed boundary method (IBM), where the structure is assumed to be immersed into surrounding fluid and the effect of the immersed boundary are considered by exertion of Lagrangian force onto the surrounding fluid grid points as body force. The flow dynamics is determined by solving discrete lattice Boltzmann equation of a single relaxation time model. The structural dynamics are solved by the finite difference method. For solving the structural dynamics, inextensibility condition was applied. A staggered grid is used in the Lagrangian coordinate system, where tension force is defined on the interfaces (half-grids) and other variables are defined on the nodes. Tension force is calculated at the intermediate steps and used as inextensibility constraint to obtain filament position at the next time step. In the present study, a detailed derivation and corresponding discretization is done for multiple free-swimming cases for a thin flexible filament. The thin flexible filament is actuated by imposing oscillatory heaving and pitching motion at the leading edge with prescribed control parameters. The flow physics of the system is investigated and pressure on the surfaces of the flexible filament is obtained. The results obtained in this study shows consistency with previous publications. The presented computational modelling may be used in future with multiple obstacles in the domain, to investigate the surface pressure variation of the swimming flexible filament and generated data sets may contribute to optimization of control mechanism of the swimmer.
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Title: A STUDY OF MARGINALIZED NEWS PUBLICATION COMMENTERS AND THEIR MOTIVATIONS AND PERCEPTIONS OF LGBTQIA+ NEWS FORUMS
Creator: Kim, Soojeong
Date: 2022
Collection: Electronic Theses & Dissertations
Description: The majority of news comment studies focus on elite news publications such as The New York Times. These studies typically arrive at one of two conclusions: (a) news comment forums are uncivil spaces and (b) White men dominate the conversation spaces on news websites. Yet we know little about how marginalized news commenters on alternative news publications’ online comment forums perceive news spaces and participate in them. Therefore, 22 commenters active in commenting on marginalized (i.e.,...
Show moreThe majority of news comment studies focus on elite news publications such as The New York Times. These studies typically arrive at one of two conclusions: (a) news comment forums are uncivil spaces and (b) White men dominate the conversation spaces on news websites. Yet we know little about how marginalized news commenters on alternative news publications’ online comment forums perceive news spaces and participate in them. Therefore, 22 commenters active in commenting on marginalized (i.e., LGBTQIA+) publications were interviewed to investigate news commenters’ perceptions and motivations. The Social Identity and Bounded Generalized Reciprocity theoretical frameworks suggest these news comment forums should be perceived as safer and more civil spaces due to their homogenous nature. Social Identity Theory suggests that commenters should behave in a more community-oriented way because of in-group favoritism, while Bounded Generalized suggests individuals’ commenting motivations might be driven by the reciprocal expectation that in-group members will positively reciprocate their comments and support their reputational standing. The interview results rooted in the SIT and BGR theoretical lenses provided support for those commenting motivations: (1) perceived similarity, (2) reciprocity, and (3) reputation acknowledgment, which led them to perceive that interactions are civil and safe on LGBTQIA+ news forums.
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Title: A SIMPLIFIED CALIBRATION METHOD FOR THE ELECTRO-MECHANICAL SEISMIC SENSOR
Creator: Burk, Daniel R.
Date: 2018
Collection: Electronic Theses & Dissertations
Description: We have developed a simplified calibration method that enables anyone to accurately calibrate an Electro-mechanical seismic station with speed, portability and low-cost. Current calibration methods generally require either expensive laboratory based equipment, or significant time and expertise. We have developed a simplified calibration method that uses an affordable industrial laser position sensor to optically track mass motion as a means of determining seismometer response. By comparing...
Show moreWe have developed a simplified calibration method that enables anyone to accurately calibrate an Electro-mechanical seismic station with speed, portability and low-cost. Current calibration methods generally require either expensive laboratory based equipment, or significant time and expertise. We have developed a simplified calibration method that uses an affordable industrial laser position sensor to optically track mass motion as a means of determining seismometer response. By comparing the derivative of mass displacement to seismometer coil voltage, we can determine sensitivity at any frequency within the instrument passband. The method results in the calculation of sensitivity and Poles & Zeros to within five percent. We compare the Mass Displacement Tracking (MDT) calibration method against the standard laboratory vibration table calibration, as well as the against the co-location calibration method to find that it produces equivalent results.
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Title: A SECONDARY ANALYSIS OF SBHC-REPORTED MENTAL HEALTH SERVICES, STRUCTURAL CHARACTERISTICS, AND STATE LEVEL SUPPORT FROM 2005-2014
Creator: Bustos, Tatiana Elisa
Date: 2018
Collection: Electronic Theses & Dissertations
Description: Background: More than 20% of children and youth in the U.S. experience mental health difficulties, with only about 30% receiving adequate mental health treatment services. School based health centers (SBHCs)—a comprehensive service delivery model integrating physical and mental health services within school settings—reduce barriers to health services faced by low-income families and children. Given the potential of SBHCs to improve the lives of children with mental healthcare needs, it is...
Show moreBackground: More than 20% of children and youth in the U.S. experience mental health difficulties, with only about 30% receiving adequate mental health treatment services. School based health centers (SBHCs)—a comprehensive service delivery model integrating physical and mental health services within school settings—reduce barriers to health services faced by low-income families and children. Given the potential of SBHCs to improve the lives of children with mental healthcare needs, it is necessary to explore the delivery of mental health (MH) services among SBHCs longitudinally, and identify key structural characteristics, networks, and state level supports that promote delivery of MH services across U.S. states. Method: Guided by the contextualist approach, secondary analyses of two longitudinal datasets (National SBHC Census & State Policy Survey) were carried out to: (1) identify the number of MH services reported to be delivered by state over time, and (2) identify inner and outer contexts of SBHCs with a MH component related to number of services. The consolidated framework for implementation (CFIR) was used to organize variables and guide interpretation of findings related to the interplay of contexts and delivery of services. Findings: Results suggest that specific inner and outer setting variables are related to more MH services from 2005 to 2014, but the variables had differential impacts on which type of MH service was delivered. Moreover, mandatory policies for state-funded SBHCs demonstrated more MH services over time than those otherwise. Discussion: Understanding the factors facilitating delivery of MH services is necessary to better inform policy efforts that can increase service access among underserved youth.
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Title: A RISK BASED USER TOOL TO BUILD USER CENTERED LABELS FOR MEDICAL DEVICES
Creator: Estrada, Eric Joseph
Date: 2021
Collection: Electronic Theses & Dissertations
Description: Herein we develop a user-driven, risk-based tool to inform the design of a standardized label for use with medical devices. Researchers identified 11 labeling inputs found on commercial labels and organized the inputs into a “Device Facts” box at 3 risk levels: high, medium, and low. mock labels and commercial labels were objectively compared by healthcare practitioners using a forced choice methodology where accuracy and response time served as dependent variables. Results suggested that...
Show moreHerein we develop a user-driven, risk-based tool to inform the design of a standardized label for use with medical devices. Researchers identified 11 labeling inputs found on commercial labels and organized the inputs into a “Device Facts” box at 3 risk levels: high, medium, and low. mock labels and commercial labels were objectively compared by healthcare practitioners using a forced choice methodology where accuracy and response time served as dependent variables. Results suggested that pairwise comparisons between labels (mock vs commercial) within a given risk category (e.g. high) yielded statistically significant differences at a confidence level of 95% for time to correct response. For both medium (p=0.0016) and high risk information (p<0.0001), the mock labels yielded a quicker correct response than their commercial counterparts. Only for low risk information were the commercial labels faster (p<0.0001). The gains in speed made in high/moderate risk information were not attributable trade-off. Mock labels were at least as accurate as their commercial counterparts; low and high risk yielded no sign of significant difference when mock and commercial were compared and participants were significantly more accurate with questions requiring medium risk information for the mock labels.
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Title: A Q-study of the image of public education and one local school district
Creator: Winegar, Lois Hicks
Date: 1973
Collection: Electronic Theses & Dissertations

Title: A Q-study in role identification using a sample of advertising photographs
Creator: Koch-Weser, Elke
Date: 1961
Collection: Electronic Theses & Dissertations

Title: A Phenomenological Inquiry of the Holistic Nonmedical Lived Training Experiences of End-of-Life Doulas (EOLDs)
Creator: Rozeboom, Angela M.
Date: 2021
Collection: Electronic Theses & Dissertations
Description: A new generation of aging United States (U.S.) citizens seems to be challenging cultural attitudes toward death and dying. The members of the senior baby-boom cohort are demanding more nonmedical end-of-life (EOL) home care, the right to experience a dignified and peaceful death, and the option of environmentally friendly burials. Subsequently, the field of end-of-life doulas (EOLDs) or death doula care is also emerging. As these practitioners raise awareness and claim to contribute to a...
Show moreA new generation of aging United States (U.S.) citizens seems to be challenging cultural attitudes toward death and dying. The members of the senior baby-boom cohort are demanding more nonmedical end-of-life (EOL) home care, the right to experience a dignified and peaceful death, and the option of environmentally friendly burials. Subsequently, the field of end-of-life doulas (EOLDs) or death doula care is also emerging. As these practitioners raise awareness and claim to contribute to a better quality of EOL care, they add a new dimension to the EOL field. The purpose of this qualitative phenomenological study was to understand the lived training experiences of prospective EOLDs as they sought to aid the dying and their grieving families. Individual interviews with seven trained EOLDs who completed a training program were analyzed. The results showed that those who attended the EOLD training felt strongly “called” to do EOL work. After confronting and accepting their fears and anxieties about their future dying and death experiences, they reported feeling empowered to come alongside EOL individuals and offer genuine comfort on their dying journey and postmortem care to the family.
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Title: A PILOT STUDY OF WEB-BASED INFORMATION BOTTLENECK IDENTIFICATION IN AEC PROJECTS
Creator: Pandey, Nishchhal Nihal
Date: 2022
Collection: Electronic Theses & Dissertations
Description: The success of the Architecture, Engineering, and Construction (AEC) project relies heavily on the effective communication and information exchange between project team members. A prominent reason for delays and progress shortcomings in AEC project teams is information bottlenecks, defined as missing project information bits which can be due to large influx of information or inadvertent withholding of information at a particular time. Information bottlenecks both in planning and execution...
Show moreThe success of the Architecture, Engineering, and Construction (AEC) project relies heavily on the effective communication and information exchange between project team members. A prominent reason for delays and progress shortcomings in AEC project teams is information bottlenecks, defined as missing project information bits which can be due to large influx of information or inadvertent withholding of information at a particular time. Information bottlenecks both in planning and execution phases of the project tend to cause schedule delays and cost overruns. Information and communication exchange patterns between project team members shed a light on the possible occurrence of information bottlenecks. Recent literature efforts have focused on use of software programming and key performance indicators (KPIs) to identify which phases of project are prone to occurrence of bottlenecks. One of the roadblocks in implementing majority of bottleneck identification techniques in AEC projects is the difficulty in execution. Some of the metrics defined are too complex and require rigorous manual calculations. Given the complexity and feasibility difficulties of the present methodologies for identification of bottleneck, this study aims to contribute to the body of knowledge by providing an adaptable tool that aims to improve the accuracy and practicality for predicting bottlenecks. Therefore, the research question this research aims to answer is “Can the usability and adaptability of information bottleneck prediction in AEC projects be improved through a web-based tool?”Expanding on Lean Construction concepts, key performance indicators (KPIs), efficiency, quantification metrics are developed to study the trends of information shared between AEC project team members. The developed model is semi-automated and reads data by importing the Microsoft Excel sheet which has all the raw project documentation data. A Python code developed by the researcher is used to extract information from the excel, create a dashboard, and publish information bottleneck calculations through a web-based tool. Statistical inferences drawn from the model are then be used to identify occurrence of project bottlenecks. The web-based platform is designed to cater the specific information exchange trends in a typical project. Providing visual representations, and explanations further ease the understanding of the root issue. Finally, through two expert interviews, the web tool is revised, and final tool is presented, and future directions of work are discussed.
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Title: A PERMIAN ACTINOPTERYGIAN FROM THE MINNEKAHTA LIMESTONE OF SOUTH DAKOTA, USA
Creator: Stack, Jack Reza
Date: 2021
Collection: Electronic Theses & Dissertations
Description: The interrelationships and phylogenetics of extinct Paleozoic and Early Mesozoic ray-finned fishes (Actinopterygii) are obscured by a low-quality fossil record and understudy of Late Paleozoic (Permo-Carboniferous) actinopterygians. To help address this issue, I describe a new species of ray-finned fish from the late Early Permian Minnekahta Limestone of South Dakota. This taxon is represented by two specimens, Field Museum of Natural History PF 3721 and Yale Peabody Museum 18649. PF 3721 is...
Show moreThe interrelationships and phylogenetics of extinct Paleozoic and Early Mesozoic ray-finned fishes (Actinopterygii) are obscured by a low-quality fossil record and understudy of Late Paleozoic (Permo-Carboniferous) actinopterygians. To help address this issue, I describe a new species of ray-finned fish from the late Early Permian Minnekahta Limestone of South Dakota. This taxon is represented by two specimens, Field Museum of Natural History PF 3721 and Yale Peabody Museum 18649. PF 3721 is an exceptionally well-preserved partial three-dimensional head and trunk preserving the external anatomy of and some internal elements from the skull, paired fins, and scale cover. YPM 18649 is a partially articulated, laterally compressed individual with a heavily disarticulated skull. This fish has features of the paraphyletic "paleoniscoid" group, including an immobile maxilla with a narrow suborbital process and a broad postorbital expansion, a heterocercal caudal fin, and rhombic ganoid scales. I conducted an equally weighted maximum parsimony analysis in PAUP and a Bayesian analysis with the Mkv model of morphological evolution in MrBayes with 73 other taxa and 222 characters that placed this taxon in a polytomy with other Late Paleozoic and Early Mesozoic "paleoniscoids" in the respective consensus trees. I recommend the application of parsimony and Bayesian inference techniques in tandem to the problem of early actinopterygian interrelationships to provide necessary caution and direction to future work.
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Title: A Novel, Algal-based Chemical Absorption System for Post-combustion Carbon Dioxide Capture
Creator: Smerigan, Adam John
Date: 2021
Collection: Electronic Theses & Dissertations
Description: Post-combustion carbon dioxide capture using amine solutions is an integral technology for reducing carbon dioxide emissions from the energy sector. However, environmental impacts and economic costs are restricting the implementation of amine absorbents. This study investigated the development of a sustainable algal based chemical absorption process to capture post-combustion carbon dioxide efficiently. Microalgal biomass was hydrolyzed to amino acids under basic conditions at 134oC. The...
Show morePost-combustion carbon dioxide capture using amine solutions is an integral technology for reducing carbon dioxide emissions from the energy sector. However, environmental impacts and economic costs are restricting the implementation of amine absorbents. This study investigated the development of a sustainable algal based chemical absorption process to capture post-combustion carbon dioxide efficiently. Microalgal biomass was hydrolyzed to amino acids under basic conditions at 134oC. The supernatant of the hydrolysate was purged with carbon dioxide following centrifugation, and then underwent a desorption process to regenerate a chemical absorption algae-based solvent. A mass balance of the process showed that 31% of the mass into the process was recovered as an algal amino acid product. Another 30% exited the process as wet potassium carbonate which could be recovered as potassium hydroxide. The algal amino acid absorbent product contained 0.592 mol amino acid/L composed primarily of alanine, glutamic acid, glycine, aspartic acid, leucine, lysine, and proline. A trickling filter absorption column was built to determine the absorption capacity of the algal amino acid solution. The algal absorbent (0.731 ± 0.037 mol CO2/mol amine) had a higher absorption capacity than a synthetic amino acid absorbent (0.512 ± 0.014mol CO2/mol amine) composed of glycine, alanine, proline, and lysine. Both solutions were highly regenerable showing no signs (p<0.05) of deterioration after multiple absorption and desorption cycles based on the pH of the solution, absorption capacity, and ATR-FTIR spectra. Using algal biomass as a cheap and sustainable source of amino acids is a viable alternative to synthetic amino acid absorbents.
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Title: A NUMERICAL AND EXPERIMENTAL INVESTIGATION OF A SUBSURFACE STEP USING FLASH THERMOGRAPHY
Creator: Nejdl, David
Date: 2021
Collection: Electronic Theses & Dissertations
Description: Flash thermography (FT) is a well-established non-destructive testing (NDT) technique that uses a short (~msec) pulse from a flashlamp to uniformly heat the surface of a sample and interrogate its subsurface structure based on the surface temperature response, measured with an infrared (IR) camera. Heat flow into a defect-free sample is described by a 1-D diffusion model, which transitions to higher dimensions due to subsurface discontinuities. 1-D approaches can be unreliable in the vicinity...
Show moreFlash thermography (FT) is a well-established non-destructive testing (NDT) technique that uses a short (~msec) pulse from a flashlamp to uniformly heat the surface of a sample and interrogate its subsurface structure based on the surface temperature response, measured with an infrared (IR) camera. Heat flow into a defect-free sample is described by a 1-D diffusion model, which transitions to higher dimensions due to subsurface discontinuities. 1-D approaches can be unreliable in the vicinity of abrupt thickness change, termed as the ‘transition zone,’ where lateral heat flow from the thin to thick region may mask surface temperature changes due to heat flowing into the part. In this work, we quantify the uncertainty in a “subsurface step,” of a steel sample heated on its front flat and smooth surface, while the thickness (L) of the plate changes with a known step size (dL) on the backside. Finite element models simulating the FT process were developed to understand the effect of sub-surface steps on the thermal diffusion and compared with experiments for 12 varying step (dL/L) combinations. The width of the transition zone was measured using the Thermographic Signal Reconstruction (TSR) method. Results indicate that the transition zone can be defined simply as a function of its geometry. Experiments confirmed that the model predictions work well under the assumption that the steps are properly distinguishable from each other. Lastly, equations to estimate the detectability of a step were developed to be used in addition to the camera’s detection limits. Overall, the approach used can be extended to anisotropic materials such as composites and bonded joints to enable efficient NDT of structural components.
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Title: A NARR derived low-level jet climatology over North America
Creator: Doubler, Dana L.
Date: 2013
Collection: Electronic Theses & Dissertations
Description: Previous climatological studies of low-level jets (LLJs) have been restricted to individual geographic regions. In this study, an expanded climatology of the characteristics of northerly low-level jets (N-LLJs) and southerly low-level jets (S-LLJs) is provided for North America and nearby coastal areas to better document the spatial variations of these important mesoscale circulation features. In addition, time of initiation and persistence of S-LLJ events in central North America and over...
Show morePrevious climatological studies of low-level jets (LLJs) have been restricted to individual geographic regions. In this study, an expanded climatology of the characteristics of northerly low-level jets (N-LLJs) and southerly low-level jets (S-LLJs) is provided for North America and nearby coastal areas to better document the spatial variations of these important mesoscale circulation features. In addition, time of initiation and persistence of S-LLJ events in central North America and over the Gulf of Mexico are analyzed. The North American Regional Reanalysis (NARR), with a 32-km horizontal resolution and a 3-hourly temporal resolution, was used to analyze (by time of day, month, season and year) the frequency, height above ground level, and wind speed of LLJs, and, for S-LLJs in central North America only, diurnal and seasonal variations in the time of initiation and duration jet events. The spatial analyses highlight well-known wind maxima but also point to previously-unknown locations that experience frequent jet-like wind maxima. The analyses also suggest that boundary-layer forcing is important for S-LLJ occurrence, including S-LLJs that form at high latitudes in summer and those that form in the central and southern plains in winter. The NARR-derived analyses supplement and enhance the understanding of the climatological characteristics of low-level wind maxima across North America and coastal environs. The findings also highlight that many aspects of low-level wind maxima remain incompletely understood and point to the need for considerable further research on the processes contributing to jet formation.
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Title: A Monte Carlo study of different detector geometries for HAWC
Creator: Gebauer, Iris
Date: 2005
Collection: Electronic Theses & Dissertations

Title: A Monte Carlo evaluation of ridge regression as an alternative to ordinary least squares
Creator: Coyle, Bryan Walter
Date: 1979
Collection: Electronic Theses & Dissertations

Title: A Molded Paper Pulp Packaging Design Using Topology Optimization Method
Creator: Bahlau, Jacob
Date: 2021
Collection: Electronic Theses & Dissertations
Description: Molded Paper Pulp (MPP) is a form of packaging that has become widely used because of the environmental and economic benefits. The most common MPP design method would be creating different prototypes based on the engineer’s knowledge and experience and analyzing each model to determine which model has the best design. However, this trial-and-error design method is a costly and time-consuming process. To overcome these drawbacks, topology optimization will be looked at being incorporated into...
Show moreMolded Paper Pulp (MPP) is a form of packaging that has become widely used because of the environmental and economic benefits. The most common MPP design method would be creating different prototypes based on the engineer’s knowledge and experience and analyzing each model to determine which model has the best design. However, this trial-and-error design method is a costly and time-consuming process. To overcome these drawbacks, topology optimization will be looked at being incorporated into the MPP design process. Topology optimization is a structure optimization method based on a Finite Element Analysis (FEA) and a sensitivity analysis. It has been widely used in various industries because of the design efficiency. However, the topology optimization method has not been applied into the packaging industry. The main reason is because of the limited design space of packaging and manufacturability. This thesis presents a methodology to find the optimal design of the MPP using the topology optimization method and post processing. First, the critical area is defined using a topology optimization result under a given boundary condition. Second, the topology optimization results will be superimposed to the MPP design space again. Lastly, the supporting rib structure will be added to finalize the MPP design process. Once the design is completed, the optimal design is compared to the original design to evaluate the improvement. In this thesis, MPP wine shipper is used as an example. The proposed method was able to present a new design using the topology optimization method. To demonstrate the efficiency of the new design, FEA results are presented, and the new design shows a lower stress concentration compared to the typical MPP wine shipper design in the market.
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Title: A Modified Barriered Landscape Water Renovation System for treating human wastewater
Creator: Rueckert, William A.
Date: 1979
Collection: Electronic Theses & Dissertations

Title: A Michigan Department of Transportation : implications for comprehensive state level planning
Creator: Bailey, Edgerton Warren
Date: 1972
Collection: Electronic Theses & Dissertations

Title: A MULTILINGUAL ANALYSIS OF YOUTUBE COMMENTS ON SCIENCE COMMUNICATION VIDEOS
Creator: Cottrell, Jonus
Date: 2022
Collection: Electronic Theses & Dissertations
Description: This thesis aimed to fill a gap in the literature regarding the consumption of YouTube science videos as a form of science communication and engagement. This was done by conducting an automated sentiment analysis of comments posted to YouTube videos published by popular science communication channel, Kurzgesagt. The two videos used for analysis covered the production and consumption of meat and the production and consumption of dairy and were published in English, Spanish, and German, which...
Show moreThis thesis aimed to fill a gap in the literature regarding the consumption of YouTube science videos as a form of science communication and engagement. This was done by conducting an automated sentiment analysis of comments posted to YouTube videos published by popular science communication channel, Kurzgesagt. The two videos used for analysis covered the production and consumption of meat and the production and consumption of dairy and were published in English, Spanish, and German, which provided an opportunity to compare expressed sentiment for identical content across three different target audiences. Results showed that for English and German audiences, expressed sentiment was higher for the video covering the production and consumption of meat. There were no statistically significant differences in expressed sentiment for the two videos published in Spanish. For the video covering the production and consumption of meat, the most negative expressed sentiment was found in the English-speaking audience. For the video covering the production and consumption of milk, the most positive expressed sentiment was found in the Spanish-speaking audience. Findings suggest that there are some differences in engagement across publication languages, but further research needs to be done to account for the effect of exogenous variables. Results align with previous research that suggests YouTube is a useful platform to facilitate audience engagement.
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Title: A MORAL PERSPECTIVE ON GUILT APPEALS : EXAMINING THE MORAL MATCHING EFFECT
Creator: Ye, Qijia
Date: 2022
Collection: Electronic Theses & Dissertations
Description: As a moral emotion, guilt can serve as a mechanism in social influence. However, literature showed that the effects of guilt appeals were mixed. This indicates that scholars scarcely understand the conditions under which guilt appeals work effectively. Drawing from Moral Foundation Theory (Graham et al., 2013), this study investigated the moderating role of moral foundations in guilt appeals. I argued that the match between the transgression focus of a guilt appeal and an endorsed moral...
Show moreAs a moral emotion, guilt can serve as a mechanism in social influence. However, literature showed that the effects of guilt appeals were mixed. This indicates that scholars scarcely understand the conditions under which guilt appeals work effectively. Drawing from Moral Foundation Theory (Graham et al., 2013), this study investigated the moderating role of moral foundations in guilt appeals. I argued that the match between the transgression focus of a guilt appeal and an endorsed moral foundation would increase the intensity of perceived guilt and reduce psychological reactance, thereby leading to a more positive attitude and stronger behavioral intention. A single factorial (care/harm guilt appeal vs. purity/degradation guilt appeal vs. liberty/oppression guilt appeal vs. control message) between-subject experiment was conducted to test the moral matching effect in the context of reducing children’s consumption of sugary drinks. Results showed that care-focused guilt appeal elicited more guilt and less psychological reactance than purity-focused and liberty-focused guilt appeals. More importantly, the purity foundation mitigated the negative effect of purity-focused guilt appeal on psychological reactance, particularly on anger. The explanations for the findings, theoretical and practical implications, limitations of the study, and future research directions were discussed.
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