4,894 Works

A Clearer Picture: Journalistic identity practices in words and images on Twitter

As journalists continue integrating social media into their professional work, they wrestle with ways to best represent themselves, their organizations, and their profession. Several recent studies have examined this trend in terms of branding, raising important questions about the changing ways in which journalists present themselves and how these changes may indicate shifts in their personal and professional identities. This study combines a visual content analysis of the images journalists use in their Twitter profiles...

Political Journalists’ Normalization of Twitter

Journalists are frequently doing some of their daily work on social media, spaces they did not create but have appropriated for journalistic purposes. Building on previous studies of how political journalists use social media, this study examines how news professionals and organizations are employing new affordances of the platform as they engage their audiences on Twitter. We expand on previously established narratives of normalization and negotiation of journalism’s boundaries by providing a snapshot of these...

Exploring SET Instructor, Course, and Student Biases in a Large, Urban, Public, R1 Business School

Using the SET questions as the dependent variable(s), this study answers the following research questions: (1) Are the Instructor variables of gender and race biasing factors?; (2) Are the Course variables of class size and content (qualitative to quantitative ratio) biasing factors?; (3) Is the Student variable of section-level GPA related to SET ratings?; (4) Is the administrative mode of data collection, the change from pencil and paper to online data collection, a biasing factor?...

ESSAYS ON LOSS RESERVING AND ACCOUNTING CONSERVATISM

This dissertation has three chapters studying accounting conservatism in the property-liability (P&L) insurance industry. There are two types of accounting conservatism – ex-ante (unconditional) conservatism and ex-post (conditional) conservatism. The former means that firms over-report liabilities initially, before more detailed information becomes available. The latter means that firms respond to this new information asymmetrically by recognizing expected losses more quickly than expected gains. My analysis throughout the dissertation focuses on the loss reserve accruals since...

Adverse Childhood Experiences and Adolescent Gang Membership: Utilizing Latent Class Analysis to Understand the Relationship

Research has shown that there are a number of risk factors that increase the odds of youth joining gangs, from individual- to family- to neighborhood-level risks. Studies have identified child abuse and other childhood traumatic experiences as influences on gang membership. Adverse childhood experiences (ACEs) provide a framework for how to measure and identify these traumatic events. This dissertation study uses longitudinal data from the Pittsburgh Youth Study (PYS) to inform the relationship between early...

EFFECTS OF MICROTEXTURAL INTERACTIONS OF ORGANICS AND SILICA ON SILICA DIAGENESIS

Opaline silica (opal-A) is thermodynamically unstable at surface conditions and readily transitions into opal-CT and at higher temperatures and pressures, quartz. Past work has used the temperature dependency of this phase transition for paleothermometry in opal-bearing sedimentary rocks. Those works determined that bulk concentrations of silica, organic material, and detrital minerals influenced the phase transition temperature. However, previous work only addressed the influence of these impurities on a macroscale and ignore potential microtextural interactions of...

EXTRACELLULAR VESICLES IN THE VASCULATURE: NOVEL MEANS OF COMMUNICATION DURING VASCULAR INSULT

Endothelial dysfunction, present in most cardiovascular disease, results in up-regulation of inflammatory adhesion molecules/cytokines, increases in vascular permeability, and decreased vasoprotective factors leading to vascular dysfunction. A novel means of communication between almost all cells are small vesicles containing biologically active proteins, nucleic acids, and lipids known as extracellular vesicles. Despite the advances in cardiovascular biology, the role of extracellular vesicles between endothelial cells and cells of vascular wall are underexplored. Therefore, we hypothesized that...

MECHANISMS OF G PROTEIN-COUPLED RECEPTOR 2 REGULATION AND INHIBITION IN CARDIOVASCULAR DISEASE AND AGING

G protein-coupled receptor kinase 2 (GRK2) has been a thriving therapeutic target for cardiovascular disease treatment since its discovery for desensitizing and downregulating b-adrenergic receptors that are vital to cardiac function. GRK2 inhibition through a variety of methods in animal models of cardiac ischemia and heart failure achieved improvements in cardiac function, hemodynamic function, cardiomyocyte apoptosis, and fibrotic scar size among many other observations. Although GRK2 has been used as a therapeutic tool in multiple...

The Feasibility of Implementing Froh’s Gratitude Curriculum with Adolescents in an Emotional Support Classroom

This feasibility study examined if adolescents (n=14) ages 10-14 who were assigned to an emotional support classroom could learn the principles of gratitude through a teacher taught gratitude curriculum. I was interested in the following research questions: (1) Can the Froh curriculum be implemented with fidelity in an adolescent ES class? (2) When implemented with fidelity, does the curriculum result in adolescents in ES classes learning gratitude skills? (3) Does the curriculum lead to increases...

A DUTY TO CARE: A QUANTITATIVE INVESTIGATION OF BEHAVIORAL INTERVENTION TEAMS AND COLLEGE STUDENT ENGAGEMENT

Over the last 30 years, the nation has endured frequent news stories about school shootings. In many of these incidents it has been discovered that a member of the school community was responsible for the act, leading the community to ask if these incidents could have been avoided. Students, faculty, and staff have the expectation that their educational communities will be safe spaces to learn, live, and work. In addition, there is an expectation that...

Distinguishing Remitted Bipolar Disorder from Remitted Unipolar Depression in Pre-adolescent Children: A Neural Reward Processing Perspective

Bipolar disorder (BD) and unipolar depression (UD) are two severe mood disorders, with BD often misdiagnosed as UD. Given their severity and high rates of misdiagnosis, it is of paramount importance to understand the psychological and neurobiological mechanisms underlying these disorders to enhance our ability to diagnose, treat, and prevent them effectively. Many neuroimaging studies have shown that mood disorders are associated with abnormal reward-related responses, particularly in the ventral striatum (VS). Yet, the link...

RESHAPING LOUISIANA’S COASTAL FRONTIER: TRIBAL COMMUNITY RESETTLEMENT AND CLIMATE CHANGE ADAPTATION

This dissertation examines social, political, and cultural dimensions of displacement, resettlement planning, and climate change adaptation policy experimentation along Louisiana’s Gulf Coast. I draw upon four years of ethnographic research alongside Isle de Jean Charles Biloxi-Chitimacha-Choctaw Tribal leaders, during a period just before and after their resettlement plans garnered $48 million in federal financial support. Through participant observation and interviews with Tribal leaders, their allies, media-makers who covered the Tribe’s experiences, and state planners tasked...

STUDENT ENGAGEMENT IN AN ONLINE GRADUATE BUSINESS PROGRAM AND ACADEMIC ACHIEVEMENT

This study reports on the Community of Inquiry (CoI) studend engagement model concerning online courses and programs. The model seeks to have teaching, social and cognitive presences interact with each other thus creating an educational experience for online learners. The research is guided by the following research questions: (1) Does student engagement associate academic achievement as defined by cumulative grade point average in the Online MBA program? (2) Do student demographics correlate to academic achievement...

Functional analysis of tcf21 and tbx20 in zebrafish

In response to cardiac cell death from an injury, zebrafish, as opposed to mammals, are able to regenerate new heart cells without significant scar tissue. Heart attacks, a leading cause of death in the United States, leave behind substantial scar tissue that weakens the heart and leads to a greater chance of a repeated cardiac event. Many genes and major molecular pathways are highly conserved from fish all the way to humans; thus, understanding how...

Realistic Off-Ramp Coupling Conditions for Macroscopic Highway Network Models

Transportation systems are among the critical infrastructures in every society. In order to design robust and reliable transportation networks, one needs to have a solid understanding of the behavior of the traffic flow in these networks. Many studies have been conducted to describe, control and predict the traffic flow on the networks. However, there are still some shortcomings in the existing literature that need to be addressed. For example, there are currently no satisfactory macroscopic...

CONTEMPORARY DIMENSIONAL ANALYSIS OF DENTITION OF HISPANICS AND AFRICAN AMERICANS IN PHILADELPHIA

ABSTRACT Objectives: The purpose of this pilot study is to evaluate if contemporary tooth measurements in the Greater Philadelphia area differ from those of a historical sample, from the Michigan Growth Study “Standards of Human Occlusal Development”, that are used in diagnosis and treatment planning. The objective is to compare mesiodistal and buccolingual dental measurements from contemporary Hispanic American and African American patients to a previously determined historic population of Caucasians. Methods: Intraoral scans of...

A SYSTEM OF CHANGE: INNOVATION FROM THE BOTTOM IN THE BRITISH ARMY, 1914-1918

This research is about innovation. Using the example of the British Army, which underwent great changes during the First World War, I focus on the role of soldiers and civilian in its process of adaptation to the new tools of warfare. Innovation was not a process forced from the top of the Army or produced solely by officers. Change came from a complex interaction between soldiers, army institutions, and civilians at home. Technology was the...

SCALE, SPECIALIZATION AND PERFORMANCE: EVIDENCE FROM THE HOTEL INDUSTRY

I examine the impacts of specialization and of scale on property performance and chain performance of the hotel industry. I use a large sample of branded lodging companies in the United States from 2010 to 2014 for the analyses. For property performance, I investigate how a hotel company decides on franchising on properties based on its specialization and study the impacts of the combinations of franchising choice and specialization on profitability of hotel properties. I...

VAGABONDS AND THE VIRTUAL: IDENTITY, ECONOMICS AND ETHICS IN THE GENRE OF DIGITAL TRAVEL WRITING

While the genre of travel writing has been popular with authors and audiences over centuries, developments in new media, social media and public use genres have caused an adaptation of the genre in the digital space. This genre, as it exists, claims two antecedents: first, the traditional and literary version of the genre and second, the blogs that emerged and were popularized in the late twentieth century. In exploring the genre of digital travel writing,...

TWO ESSAYS ON SERVICE ROBOTS AND THEIR EFFECTS ON HOTEL CUSTOMER EXPERIENCE

Artificial intelligence (AI) and robotics are revolutionizing the traditional paradigm of business operations and transforming consumers’ experiences by promoting human–robot interaction in tourism and hospitality. Nonetheless, research related to customers’ experiences with robot-related services in this industry remains scant. This study thus seeks to investigate hotel customers’ experiences with service robots and how robot-based experiences shape customers’ satisfaction with hotel stays. Specifically, three research questions are addressed: (a) What are hotel customers’ primary concerns about...

Applying the Generalized Matching Equation to Penalty Kick Selection During Elite Soccer Competition

The Generalized Matching Equation (GME) has been utilized by many behavioral researchers as a model of operant choice, especially in elite sports. In this instance, the GME was used to analyze the penalty-kick selections (e.g., shoot right or shoot left) of nine elite international soccer players. The analysis of archival data from in-game decisions demonstrated the presence of matching across participants and within a naturalistic setting. Undermatching consistent with previous laboratory and non-laboratory research on...

Geochemical Behavior of Low Valence Manganese Oxides: Effects of Structural Impurity and Secondary Mineral

As the third most abundant transition metal in the Earth’s crust, manganese (Mn) is often found in various forms of (oxyhydr)oxides in the environment (hereafter, Mn-oxides). Mn-oxides possess a high sorption capacity and are a powerful oxidizer, and thus, play critical roles in regulating nutrient cycles and the speciation and distribution of trace metals and metalloids in the environment. The structure and geochemical behaviors of Mn-oxides have been extensively studied using birnessite minerals that contain...

Single-Molecule Study of β-Catenin Translocation and the Role of Custos in its Regulation

The nuclear pore complex is closely involved in the regulation and control of many cellular processes, including the movement of molecules into and out of the nucleus along with the regulation of gene transcription. It is therefore a major barrier for controlling the passage of signaling molecules into and out of the nucleus. β-catenin is one such signaling molecule, and a primary signaling molecule of the Wnt signaling pathway. How the passage of β-catenin into...

Exact Relations Satisfied by the Effective Tensors of Two-Dimensional Two-Phase Thermoelectric Composites

Thermoelectric materials have been used for cooling and heating systems for over a hundred years. Today practical applications of thermoelectric devices include cooling car seats, power generation, and refrigeration. Thermoelectric materials are special for their ability to convert temperature imbalances into electricity. Their applications can inform the discourse about the transition to renewable energy sources---something that our Earth most desperately needs. The goal of this dissertation is to describe how the effective tensors of two-dimensional...

NONLINEAR AND ULTRAFAST OPTICAL STUDIES OF INTERFACIAL PROCESSES IN PHOTOVOLTAIC NANOMATERIALS

The development of efficient solar energy conversion devices has attracted much attention. Despite the fact that progress have been achieved, a fundamental understanding examining why efficiency can be improved remains elusive. For example, dye-sensitized solar cells (DSSC) exhibit high conversion efficiency when acetonitrile is used to prepare both the working electrode and the electrolyte. However, the mechanism explaining exactly how solvent influences device performance has not yet been systematically investigated. Another prominent example is the...

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