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Large-eddy simulation of turbulent wall-pressure fluctuations using the finite element method
Get PDFIn the present dissertation, turbulent wall-pressure fluctuations are characterized. To capture the turbulent characteristics of the flow, large-eddy simulation is used to resolve the large scale motions of the flow directly. A wall-adapting local eddy-viscosity model is selected to account for the effect of small scale motions. The streamwise/upwind Petrov-Galerkin method is chosen to discretize the computational domain and a second-order backward difference formula is applied for the time integration. Maintaining turbulent flow throughout the simulation domain to properly characterize turbulence is critical in investigating wall-pressure fluctuations. In order to reduce the size of the simulation domain an inflow generation method, a variant of the recycling and rescaling method, is used. In this method, the turbulent velocity profile from a specific plane within the computational domain is recycled and rescaled propriately, and re-introduced at the inlet of the domain at every time step iteration. In the proposed method, the mean velocity profile is fixed at the inlet while the velocity fluctuations are recycled and rescaled to obtain the desired turbulent characteristics. This method is simple and effective and maintains the turbulent flow throughout the simulation domain. The non-reflecting boundary conditions with a sponge layer are applied at the top and exit of the computational domain to remove unwanted reflections from the boundary. In order to examine the present inflow generation method and the ability to capture the wall-pressure fluctuations, numerical results are verified on a flat plate with a zero pressure gradient. The mean velocity profile, the RMS velocity fluctuations, and the friction velocity over time are investigated to show the effectiveness of the present inflow turbulent generation method. Computed wall-pressure fluctuations are evaluated using the time-averaged statistics and the spectra, to show that they are characterized well using the present method
Calling and Crafting in Cahoots
Get PDFThis project aims to examine the relationship between work as a calling, job crafting, and person-job fit. Work as a calling is the internal force that drives individuals toward a specific career, whereas job crafting is the active adjustments one makes to improve aspects of his or her work. Person-job fit is the perception that employees have concerning a match between oneself and the chosen career path. Despite the numerous beneficial outcomes that have been empirically supported over time, only job crafting has been investigated as a direct predictor of this fit. Even then, there seems to be little research dedicated to this matter. Additionally, there still remains questions concerning how work as a calling fits into this model. It is unknown whether perceiving a calling increases person-job fit independently or through the mediation of job crafting. In order to improve perceptions of person-job fit, understanding the antecedents should be just as crucial as studying what follows, if not more so. To further the knowledge of these relationships, this project will gather data from working professionals who will be recruited through Amazon Mechanical Turk. The participants will complete a short survey involving work as a calling, job crafting, and person-job fit scales. They will be asked to respond through the use of a survey format administered online. The data will be analyzed by conducting a series of multiple regressions. The results of this study will further the research findings related to this topic, as well as support future attempts aimed at understanding ways in which person-job fit can be increased
Can a Leader be too Conscientious? A Linear vs. Curvilinear Comparison
Get PDFPast research examines relationships between personality and leadership. One well studied factor of personality is conscientiousness. This personality trait would seem to be ideal in a leader. However, there may be a dark side to conscientiousness if a leader reaches a point in conscientiousness where it has a negative affect on their leadership skills. Studies have been conducted to examine the shape of the relationship between conscientiousness and aspects of leadership, though the results are inconclusive. For this proposed research study, the hypothesis is that a curvilinear shape is predicted between conscientiousness and leadership in higher education, meaning that leadership skills could diminish at a certain point if conscientiousness behaviors become detrimental. The author plans to examine the relationship between conscientiousness and leadership style in a higher education setting utilizing the hierarchy structure of department directors as leaders and their direct reports as followers. The data would be analyzed using regression analysis, including linear and squared tertiary split. If a linear relationship emerges, it would be interesting to control for personality of the followers to see if it moderates the leader’s relationship between conscientiousness and leadership. Additional data will be collected for secondary analyses. These analyses may allow for more generalizable information as well as being conducive to furthering the available literature. The focus of the poster will concentrate on the shape of the relationship between conscientiousness and leadership
Trouble at work: A model testing relationships among job strain, social support, cooperativeness, and well-being
Get PDFThe purpose of this study is to test a model proposing that levels of cooperativeness at work affect job strain, as mediated by perceived social support, thereby affecting overall mental well-being
Work and family life: the relationship between spousal support, spousal conflict, and work outcomes
Get PDFAbstract Balancing relationships and jobs are difficult in the fast-paced lifestyle that the average American worker faces on a regular basis. If the relationship or job is more difficult and takes more energy and time, it may have an effect on the other. Too much attention on either area can be detrimental to the other, so it is crucial to maintain a balance between both areas of life. This idea is known as the spillover effect (i.e., how having a good marriage can produce satisfaction in both a relationship and in work) (Liang, 2015). Furthermore, family and work relationships can be beneficial or detrimental towards one another depending on how each spouse views the importance of both areas in their lives. A previous study looked at work-family relationship through the causes of exhaustion and stress when work and family demands overlap, and found that employees with more exhaustion from a lack of balance were less likely to be given promotions (Wayne, Lemmon, Hoobler, Cheung, and Wilson, 2017). This loss of energy can affect the success of a worker, specifically in the eyes of the supervisor, and revealed that exhaustion affects the mood towards the spouse and towards the boss. In the current study, we will be looking at the relationships between variables related to support outside of the workplace and important workplace variables such as satisfaction and engagement. Specifically, I will examine spousal support and its relationship with emotional exhaustion, engagement, life satisfaction, and job satisfaction. I predict that spousal support will have a negative relationship with emotional exhaustion and a positive relationship with engagement, job satisfaction, and life satisfaction. Conversely, since spousal conflict should create conflict at home and drain energy and time resources, I predict that spousal conflict will have the opposite relationships compared to spousal support with the given variables. This study will also help identify certain areas that partners should be aware of to have a healthy relationship. However, although spousal support may be imperative for a long-lasting relationship, is also important for performance at work. Additionally, it is not just physical exhaustion that may impact work engagement, but also emotional exhaustion that may result from home-life spillover. Organizations can take these findings to evaluate how they can make their workspace better by encouraging meaningful time at work and also at home. Method Participants We will use Amazon’s Mechanical Turk (MTurk) to recruit approximately 250 participants for the study. MTurk is an online crowdsourcing platform where “workers” can complete tasks (e.g., surveys) for monetary compensation. Study inclusion criteria include the need to be married and a full-time employee. Design & Analyses For this study, spousal support, spousal conflict, emotional exhaustion, employee engagement, life satisfaction and job satisfaction will be measured. All variables will be assessed through MTurk. Correlational and regression analyses will be used to interpret results. Measures Spousal support. Spousal support will be studied using an eight-item scale that measures how much an individual feels affirmed from the people in their lives they view as supportive (Abbey, Abramis & Caplan, 1985). Items are measured from 1 to 5 with 1 = Not at All and 5 = A Great Deal. An example item is, “My partner listens to me when I need to talk about things that are very important to me”. Spousal conflict. Spousal support will be studied using a five-item scale that measures the conflicts that a person faces with family members that occurs in anger or tension (Abbey, Abramis & Caplan, 1985). Items are measured from 1 to 5 with 1= Not Very Much and 5= Very Much (Braiker and Kelly’s, 1979). An example item is, “When you and your spouse argue, to what extent are the problems or arguments serious?”. Employee engagement. Employee engagement will be studied using a nine-item assessment scale that measures a mindset that is characterized by vigor, dedication, and absorption (Schaufeli, Salanova, Gonzalez, & Bakker, 2002). Items will be modified from to measure engagement from the employee’s own perspective rather than their supervisors. Items are measured from 1 to 7 with 1= Strongly Disagree and 7= Strongly Agree. An example item that will be asked is “At work, I am full of energy”. Emotional Exhaustion. Emotional exhaustion will be studied using a five-item scale from the MBI General Survey that measures how someone distances themselves due to the amount of work as a coping mechanism (Schaufeli, Leiter, Maslach, & Jackson, 1996). Items are measured from 1 to 7 with 1= Strongly Disagree and 7= Strongly Agree. An example question is “I feel all used up at the end of the workday”. Job Satisfaction. Job satisfaction will be measured using a three item scale that assesses employee satisfaction with their work, their coworkers, and their supervisor (Price & Mueller, 1986). Items are measured on from 1 to 5 with 1 = Very Unsatisfied and 5 = Very Satisfied. An example item is, “All in all, how satisfied are you with the work itself of your job?”. Life Satisfaction. Life satisfaction will be studied using the five item Satisfaction of Life Scale that measures an individual’s perception of their quality of life (Diener, Emmons, Larsen, & Griffin, 1985). Items are measured from 1 to 7 with 1= Strongly Disagree and 7= Strongly Agree. An example question is “In most ways, my life is close to ideal”
Validating an Ally Skill-Building Workshop: Assessing Antecedents and Outcomes
Get PDFAlly Skill-Building workshops are a recent development within the diversity field. Building allies in the workplace is essential to creating a culture of inclusion and respect and assists in mitigating the potential negative implications of an ever-increasing diverse workforce. While theoretical evidence exists surrounding individual and contextual factors that may impact the effectiveness of an Ally Skill-Building Workshop, no study has addressed the social norms, personality dispositions, biases stemming from social categorizations, reactions, and behavioral intentions over time. Specifically, assessing the level of inclusivity of participating organizational departments via social norms will help determine the environment in which an ally skill-building workshop will have the power to be impactful. Further, understanding individual differences such as a belief in the malleability of personality and the extent to which one holds color-blind racial attitudes and sexist beliefs, the present study seeks to determine a pathway that identifies the individual and contextual variables that impact the behavioral outcomes of an Ally Skill-Building Workshop. However, identifying the antecedents to an impactful Ally Skill-Building workshop is only half of the story being told. The present study will also assess participant reactions to the Ally Skill-Building workshop and their intention to display allyship behaviors post-workshop. Utilizing an applied longitudinal analyses, the present study will contribute to the diversity literature by assessing a unique combination of antecedents and outcomes over time
Using local primary sources to explore the impact of inventions and innovations of the Industrial Revolution : part I
Get PDFhttps://scholar.utc.edu/primary-source-instructional-materials/1002/thumbnail.jp
Registration and course selection processes of entering freshmen and the effects on academic success and retention at a midsize public university
Get PDFThis mixed-methods study concentrated on students who participated in a 2-day freshman orientation program and registered for courses at a midsize metropolitan 4-year public university located in the southeastern United States. This study examined three cohorts of entering freshmen as they progressed through the course-registration process of freshman orientation and then one full academic year. There was also consideration of the institutional departments involved in the process and their perceptions of the experience. The quantitative portion of this mixed-methods study was based on Bean and Metzner’s (1985) longitudinal tracking system for nontraditional student attrition. Two frameworks were used for the qualitative portion of the study. The first was constructivist grounded theory due to its research of a university process, and how this process may impact various independent departments in the institution. The second portion of the qualitative review was narrative inquiry; the lived experience of the researcher with respect to the preregistration process provided a program evaluation of the process itself. The first research question addressed the combination of student characteristics that best predicted first-year student academic success. Across all academic success markers, female students were more likely to be successful than male students. The second research question asked what combination of the six academic outcome variables best predicted first-year student retention at the University of Tennessee at Chattanooga (UTC). The variables with the most significant impacts were UTC grade point average (GPA), semester earned credits, attempted overall credits, and the completion of preregistration. The third research question considered if the method of first-time course registration was significant in student retention. It was determined that the preregistration process had a positive impact. Finally, the fourth research question was a consideration of the perceived impact of the Academic Interest Questionnaire (AIQ) on administrative processes. Through narrative inquiry, the AIQ was found to have improved over time, and the majority of academic departments have become vested in the process. The narrative findings were supported by interview responses
Preparation of organometallic cobalt(III) complexes containing bidentate chiral amine ligands as potential transfer hydrogenation catalysts
Get PDFMixed coordination sphere cobalt(III) complexes containing a chiral bidentate amine ligand and an organic carbocyclic ligand have been prepared and characterized. The integration of this mixed ligand environment involving an organometallic and Werner-type ligand along with the earth abundant metal in a high oxidation state has the potential for interesting reactivity. Complexes of the type [Co(CpR)(X-DPEN)(I)](I), where CpR = cyclopentadienyl (Cp, R = H) or pentamethylcyclopentadienyl (Cp*, R = Me) and X = meso-1,2-, 1R,2R-, and 1S,2S-, have been prepared by ligand substitution from [Co(CpR)(I)2(CO)] with 1,2-diphenyletheylenediamine (DPEN). The outer sphere iodide is readily exchangeable with sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (NaBArF) or cesium acetate (CsOAc), and both iodides can be exchanged with silver(I) acetate (AgOAc). The latter reactions with AgOAc results in either [Co(CpR)(X-DPEN)(OH2)](OAc)2 or [Co(CpR)(X-DPEN)(OAc)](OAc) depending on the solvent profile, and partial iodide removal to produce [Co(Cp*)(1S,2S-DPEN)(OAc)](I) in the presence of CsOAc. The complexes are isolated as diamagnetic black, dark purple, or, in the case of acetate complexes, pink solids and characterized by 1H-NMR, 13C-NMR and UV-vis spectroscopy as well as either elemental analysis or mass spectrometry. Four complexes, [Co(Cp)(1R,2R-DPEN)(I)](I) (1), [Co(Cp)(1S,2S-DPEN)(I)](BArF) (2a), [Co(Cp*)(1S,2S-DPEN)(I)](I) (4), and [Co(Cp*)(1S,2S-DPEN)(OAc)](I) (13) have been characterized by single-crystal X-ray diffraction. The preparation, characterization, and initial reactivity of these complexes as potential catalysts for aqueous hydrogen transfer as well as the extension to the substituted chiral amine (R,R)-N-(2-amino-1,2-diphenylethyl)-p-toluenesulfonamide (Ts-DPEN) will be discussed
Virtual existence and its ambiguities: how postphenomenology of technology clarifies our situation in a digital world.
Get PDFFor many contemporary western societies, digital technology has become a pervasive aspect of the day-to-day lives of many individuals, and a large philosophical conversation has resulted around how the use of such technologies changes our lives. Postphenomenology, a relatively recent philosophical development, offers a distinct approach to discussing technology from a practical, situated orientation. While this approach has roots in phenomenologists like Martin Heidegger and Maurice Merleau-Ponty, it attempts a more contingent and empirical project that more thoroughly discusses the existential implications of human/technology relationships. In this paper, I trace the roots of postphenomenology in the works of Heidegger and Merleau-Ponty, examine some challenges from the poststructuralist writers Michel Foucault and Jean Baudrillard, and explain how postphenomenology can persist as a useful philosophical approach to technology. Furthermore, I examine our relationship to digital devices through a postphenomenological lens in order to highlight some distinct existential implications that result from using these complex technologies. Ultimately, after developing ideas from other authors of postphenomenological literature, particularly in Don Ihde’s transparency/opacity model, I conclude that our relationship to digital technologies is accurately characterized as a hybrid relation where we both embody them and interpret their contents