Matching Items (1,228)
Filtering by
- All Subjects: psychology
- All Subjects: Mechanical Engineering
Description
Human Immunodeficiency Virus (HIV) remains a persistent problem around the world, even though antiretroviral therapy has shown to be effective in reducing viral load and limiting transmission of the virus. Due to HIV’s infectious nature, visibility, the populations at risk, and its connections to race, class, and sexuality, it is more stigmatized than any other illness. HIV stigma has been associated with increased depression, social isolation, and poor psychological adjustment. HIV stigma can influence disclosure and care-seeking behavior. Internet-based interventions have shown to be effective in increasing knowledge on STIs and HIV, however, researchers have tested strategies that include educating participants on HIV to reduce stigma and have found that informational approaches alone are not effective. There is evidence that emotional intelligence and empathy are associated with prosocial behavior and influence attitudes towards stigmatized groups. Thus, this thesis aims to test an online intervention using an informational video from the Center for Disease Control and Prevention (CDC) in combination with an empathy-generating component to reduce stigma. It was hypothesized that the online intervention would increase HIV knowledge scores (H1), but stigma will only be reduced in the group introduced to the empathy-inducing component (H2) and those with high emotional intelligence would show the greatest reduction in stigmatizing attitudes (H3). Results did not support these hypotheses, suggesting that the CDC’s video does not significantly increase HIV knowledge in the general public. Further, the video intended to generate empathy and reduce stigma was also ineffective. These findings stress the need for further research and questions the effectiveness of empathy-generating interventions (e.g., FACES OF HIV, HIV Justice Network) to increase knowledge and reduce stigma. Future researchers should test the effectiveness of personalized interventions to reduce HIV-related stigma.
ContributorsEl-krab, Renee (Author) / Vargas, Perla (Thesis advisor) / Roberts, Nicole (Committee member) / Chen, Angela (Committee member) / Arizona State University (Publisher)
Created2020
Description
The body tilt illusion relates to one’s exaggerated perception of body tilt angle in comparison to reality. People tend to overestimate this illusion and feel that they are tilted at 45º when they are tilted less than 45º in reality. This illusion increases with lack of sensory cues and decreases when sensory cues are added. In the present study, distortion in the perception of body tilt was examined as a function of center of mass. There are gender differences in regards to where one’s center of mass lies on their body, with females having a lower center of mass on average compared to males (Elert, 2005). We used a human-sized 3D gyroscope to test participants’ experience of the body tilt illusion. The findings support that perception of body tilt is multisensory and that visual information as well as the tilting plane affects the magnitude of the illusion. This is consistent with the illusion being functional for helping people keep their balance. Yet, we did not find significant differences in the size of the illusion due to differences in center of mass. The pattern of findings supports that the body tilt illusion is relatively universal, and likely functional, but does not vary much due to individual body shape differences like center of mass.
ContributorsOverby, Ashlyn (Author) / Mcbeath, Micheal (Thesis director) / Baia, Sophia (Committee member) / Corbin, William (Committee member) / Cavanaugh-Toft, Carolyn (Committee member) / Barrett, The Honors College (Contributor) / Department of Psychology (Contributor)
Created2024-05
Description
Greater cross-disciplinary collaboration between the fields of sustainability and clinical psychology could lead to improved outcomes for both. Moreover, some forms of mental disorder, such as PTSD and Moral Injury, constitute serious challenges that require the attention of sustainability’s interdisciplinary, systems-focused, solutionsoriented approach. My research frames the impacts of combat-related psychological trauma on military veterans as a sustainability problem according to criteria put forward by Arnim Wiek’s Transformational Problem Solving framework. I also provide a review of studies demonstrating the treatment benefits of agricultural therapy for veterans diagnosed with PTSD or symptoms associated with Moral Injury. I then describe my own efforts investigating the connection between trauma and sustainability using survey measurements, interviews, and participant observation onsite at Growing Veterans farm in Mt. Vernon, Washington. The results strongly suggest that sustainable agricultural can be of powerful clinical benefit to traumatized veterans and that sustainable behaviors and values in general increased as trauma symptoms decreased. More broadly, the project indicates that slight shifts in how we approach solution formulation and how we articulate and disseminate sustainability messages could have profound positive effects on the sustainability’s success.
ContributorsGabriele, Adam (Author) / Hirt, Paul (Contributor) / Cloutier, Scott (Contributor) / Valdez, Herendira (Contributor)
Created2018-03-27
Description
Integrating advanced materials with innovative manufacturing techniques has propelled the field of additive manufacturing into new frontiers. This study explores the rapid 3D printing of reduced graphene oxide/polymer composites using Micro-Continuous Liquid Interface Production (μCLIP), a cutting-edge technology known for its speed and precision. A printable ink is formulated with reduced graphene oxide for μCLIP-based 3D printing. The research focuses on optimizing μCLIP parameters to fabricate reduced graphene composites efficiently. The study encompasses material synthesis, ink formulation and explores the resulting material's structural and electrical properties. The marriage of graphene's unique attributes with the rapid prototyping capabilities of μCLIP opens new avenues for scalable and rapid production in applications such as energy storage, sensors, and lightweight structural components. This work contributes to the evolving landscape of advanced materials and additive manufacturing, offering insights into the synthesis, characterization, and potential applications of 3D printed reduced graphene oxide/polymercomposites.
ContributorsRavishankar, Chayaank Bangalore (Author) / Chen, Xiangfan (Thesis advisor) / Bhate, Dhruv (Committee member) / Azeredo, Bruno (Committee member) / Arizona State University (Publisher)
Created2024
Description
Automation is becoming more autonomous, and the application of automation as a collaborator continues to be explored. A major restriction to automation’s application as a collaborator is that people often hold inaccurate expectations of their automated collaborator. Goal alignment has been shown to be beneficial in collaborations and delegation decisions among human-human and human-automation collaborations. Few studies have investigated the difference that goal alignment has on human collaborators compared to automated collaborators. In this 2 (goal aligned or misaligned) x 2 (human or automated) between-subjects study, participants complete a simplified triage patient task and then are given the opportunity to stay with their manual task solution or to delegate their decision and go with their collaborator’s recommendation. Participants never delegated to collaborators with goals that were not aligned to theirs. Participants working with human collaborators that have similar goals to them were more often delegated to and more often associated with a better triage performance. These results can inform the design of similar systems that foster collaboration and achieve better team performance. Although goal alignment was crucial for delegation decisions, it was difficult to achieve complete agreement of goals. Future research should investigate effective methods to better communicate goals among collaborators.
ContributorsLee, Jessica Rose (Author) / Chiou, Erin K (Thesis advisor) / Cooke, Nancy J (Committee member) / Lum, Heather C (Committee member) / Arizona State University (Publisher)
Created2024
Description
In understanding why cultures differ from one another, one might consider their ecology: the social and physical features of the environment relevant to an organism’s fitness. Multiple theories propose that cultures and the individuals within them respond to the threats and opportunities offered by the ecology in predictable and adaptive ways. This dissertation demonstrates how ecology can -- but does not always -- explain a significant portion of cultural variation. The three published, first-authored, peer-reviewed articles featured in this work leverage best practices in archival data to demonstrate the relationship between ecology and cultural variation. Chapter 2 describes the creation of the Eco-Cultural Dataset which contains data on 11 ecological variables and 72 cultural variables in up to 220 countries. Chapter 3 utilizes this dataset to estimate the effect of ecology on culture, writ large. Chapter 4 explores the potential role of pathogens in the existence and prevalence of food taboos in religious and cultural groups. The final chapter reviews the limitations of utilizing archival data to investigate ecology and culture, as well as proposing exciting future directions for the field.
ContributorsWormley, Alexandra (Author) / Varnum, Michael EW (Thesis advisor) / Cohen, Adam B (Committee member) / Neuberg, Steven L (Committee member) / Wynne, Clive DL (Committee member) / Arizona State University (Publisher)
Created2024
Description
When solving analysis, estimation, and control problems for Partial Differential Equations (PDEs) via computational methods, one must resolve three main challenges: (a) the lack of a universal parametric representation of PDEs; (b) handling unbounded differential operators that appear as parameters; and (c), enforcing auxiliary constraints such as Boundary conditions and continuity conditions. To address these challenges, an alternative representation of PDEs called the `Partial Integral Equation' (PIE) representation is proposed in this work. Primarily, the PIE representation alleviates the problem of the lack of a universal parametrization of PDEs since PIEs have, at most, $12$ Partial Integral (PI) operators as parameters. Naturally, this also resolves the challenges in handling unbounded operators because PI operators are bounded linear operators. Furthermore, for admissible PDEs, the PIE representation is unique and has no auxiliary constraints --- resolving the last of the $3$ main challenges. The PIE representation for a PDE is obtained by finding a unique unitary map from the states of the PIE to the states of the PDE. This map shows a PDE and its associated PIE have equivalent system properties, including well-posedness, internal stability, and I/O behavior. Furthermore, this unique map also allows us to construct a well-defined dual representation that can be used to solve optimal control problems for a PDE. Using the equivalent PIE representation of a PDE, mathematical and computational tools are developed to solve standard problems in Control theory for PDEs. In particular, problems such as a test for internal stability, Input-to-Output (I/O) $L_2$-gain, $\hinf$-optimal state observer design, and $\hinf$-optimal full state-feedback controller design are solved using convex-optimization and Lyapunov methods for linear PDEs in one spatial dimension. Once the PIE associated with a PDE is obtained, Lyapunov functions (or storage functions) are parametrized by positive PI operators to obtain a solvable convex formulation of the above-stated control problems. Lastly, the methods proposed here are applied to various PDE systems to demonstrate the application.
ContributorsShivakumar, Sachin (Author) / Peet, Matthew (Thesis advisor) / Nedich, Angelia (Committee member) / Marvi, Hamidreza (Committee member) / Platte, Rodrigo (Committee member) / Berman, Spring (Committee member) / Arizona State University (Publisher)
Created2024
Description
The measurement of the radiation and convection that the human body experiences are important for ensuring safety in extreme heat conditions. The radiation from the surroundings on the human body is most often measured using globe or cylindrical radiometers. The large errors stemming from differences in internal and exterior temperatures and indirect estimation of convection can be resolved by simultaneously using three cylindrical radiometers (1 cm diameter, 9 cm height) with varying surface properties and internal heating. With three surface balances, the three unknowns (heat transfer coefficient, shortwave, and longwave radiation) can be solved for directly. As compared to integral radiation measurement technique, however, the bottom mounting using a wooden-dowel of the three-cylinder radiometers resulted in underestimated the total absorbed radiation. This first part of this thesis focuses on reducing the size of the three-cylinder radiometers and an alternative mounting that resolves the prior issues. In particular, the heat transfer coefficient in laminar wind tunnel with wind speed of 0.25 to 5 m/s is measured for six polished, heated cylinders with diameter of 1 cm and height of 1.5 to 9 cm mounted using a wooden dowel. For cylinders with height of 6 cm and above, the heat transfer coefficients are independent of the height and agree with the Hilpert correlation for infinitely long cylinder. Subsequently, a side-mounting for heated 6 cm tall cylinder with top and bottom metallic caps is developed and tested within the wind tunnel. The heat transfer coefficient is shown to be independent of the flow-side mounting and in agreement with the Hilpert correlation.
The second part of this thesis explores feasibility of employing the three-cylinder concept to measuring all air-flow parameters relevant to human convection including mean wind speed, turbulence intensity and length scale. Heated cylinders with same surface properties but varying diameters are fabricated. Uniformity of their exterior temperature, which is fundamental to the three-cylinder anemometer concept, is tested during operation using infrared camera. To provide a lab-based method to measure convection from the cylinders in turbulent flow, several designs of turbulence-generating fractal grids are laser-cut and introduced into the wind tunnel.
ContributorsGupta, Mahima (Author) / Rykaczewski, Konrad (Thesis advisor) / Pathikonda, Gokul (Thesis advisor) / Middel, Ariane (Committee member) / Arizona State University (Publisher)
Created2024
Description
Among Latinxs living in the United States (U.S.), AfroLatinx individuals are more susceptible to dying from COVID-19 because of pre-existing health conditions such as diabetes, heart disease, and hypertension (Chapman, 2020). These health disparities, in turn, have been associated with economic inequalities AfroLatinx communities face in the U.S. due to discrimination and racism (Weinstein et al., 2017). Scholars have called attention to the need to focus on AfroLatinx populations, given the systematic denial of AfroLatinx experiences in the psychological literature (Sanchez, 2021) and the systemic and institutional barriers AfroLatinx face when seeking physical and mental health support (Borrell, 2005). Using Borrell's (2005) framework for studying the determinants of health disparities affecting AfroLatinxs, in Study 1, I examined the association between individual characteristics (e.g., socioeconomic indicators), psychosocial factors (e.g., economic distress), and contextual factors (e.g., discrimination) reported by AfroLatinx adults and emotional and physical health problems during the COVID-19 pandemic. As an expansion of Borrell's model, I also examined whether having a pre-existing condition can help explain mental health distress above and beyond other determinants of health disparity. Study 2 built on the first study by helping identify the specific areas of stress and needs identified by AfroLatinxs during the COVID-19 pandemic. The second aim of Study 2 was to determine the more frequent and effective strategies AfroLatinxs with pre-existing conditions used to cope with COVID-19-related stressors and needs.
ContributorsFaison, Alexis Duckett (Author) / Capielo Rosario, Cristalís (Thesis advisor) / Dillon, Frank (Committee member) / Vasquez, Elisa (Committee member) / Arizona State University (Publisher)
Created2024
Description
ABSTRACT
It is unclear how often defense attorneys ask child complainants questions with implied meanings. The present study examined the frequency and content of implied questions asked to 6- to 17-year-old children and analyzed how often children rebutted these questions. This study focused on cross-examinations (N = 122) of child complainants in Child Sexual Assault (CSA) trials. Content analysis revealed prevalent themes of implicit questions that alluded to child complainants having ulterior motives, having been coached, being untruthful, missing disclosure opportunities, having poor memory, and other credibility issues. Implicit questions were posed in 63% of cases, with children rebutting only 11% of implied inquiries. No significant correlations were found between the age of the child testifying and the frequency of implicit questions or rebuttals. However, as children age they are more frequently asked questions related to truthfulness and credibility issues and are less frequently asked implicit inquiries about coaching. These findings present novel evidence that children are frequently asked difficult to answer implicit questions that imply the child has ulterior motives, and that attorneys change the focus of the content of their implicit questions by age.
ContributorsSobrilsky, Lea (Author) / Stolzenberg Roosevelt, Stacia (Thesis advisor) / Fine, Adam (Committee member) / O'Hara, Karey (Committee member) / Arizona State University (Publisher)
Created2024