Digital Commons Network^™

Model-Based Imputation Of Below Detection Limit Missing Data And Group Selection In Bayesian Group Index Regression, Matthew Carli

Theses and Dissertations

Investigations into the association between chemical exposure and health outcomes are increasingly focused on the role of chemical mixtures, as opposed to individual chemicals. The analysis of chemical mixture data required the development of novel statistical methods, one of these being Bayesian group index regression. A statistical challenge common to all chemical mixture analyses is the ubiquitous presence of below detection limit (BDL) data. We propose an extension of Bayesian group index regression that treats both regression effects and missing BDL observations as parameters in a model estimated through a Markov Chain Monte Carlo algorithm that we refer to as …

The Environment Of Interprofessional Education In Graduate Education: Exploring Professional Programs Of Occupational Therapy, Physician Assistant, And Physical Therapy, Allison R. Kaczmarek

Theses and Dissertations

Interprofessional education (IPE) is an educational approach of increasing popularity in professional schools for the preparation of a collaborative ready healthcare workforce. The accrediting bodies of professional education programs in occupational therapy (OT), physician assistant (PA), and physical therapy (PT) have incorporated standards for outcomes addressing IPE. Although they have endorsed the Health Professions Accreditors Collaborative (HPAC) consensus document on quality IPE, we do not have a contemporary snapshot of the IPE environments in the curriculum of their accredited programs. This dissertation, a collection of three distinct inquiries, has two aims: first, to provide a description of IPE as it …

Singing The Landscape: A Meditation On Song, Sound And Community At The Fall Line Of The James River, Sara Bouchard

Theses and Dissertations

I work in the medium of song. A multidisciplinary artist and composer, I make work that is immersive, time-based and often participatory. I interact with landscape and the complexities of American history, bringing into focus local ecologies through the lens of song.

This document accompanies my thesis performance The Sound of a Stone, an immersive exploration of song, language, ecology and locational listening performed in a 4-channel surround format. In the semi-improvised composition, I sample live vocals, mandolin and found natural objects in a combination of roots music traditions and experimental techniques. Utilizing the software Ableton Live to process …

Assessing The Impact Of Incorporating Residential Histories Into The Spatial Analysis Of Cancer Risk, Anny-Claude Joseph

Theses and Dissertations

In many spatial epidemiologic studies, investigators use residential location at diagnosis as a surrogate for unknown environmental exposures or as a geographic basis for assigning measured exposures. Inherently, they make assumptions about the timing and location of pertinent exposures which may prove problematic when studying long latency diseases such as cancer.

In this work we explored how the association between environmental exposures and disease risk for long-latency health outcomes like cancer is affected by residential mobility. We used simulation studies conditioned on real data to evaluate the extent to which the commonly held assumption of no residential mobility 1) affected …

Development Of My Footprint Calculator, Karthik Mummidisetti

Theses and Dissertations

The Environmental footprint is a very powerful tool that helps an individual to understand how their everyday activities are impacting environmental surroundings. Data shows that global climate change, which is a growing concern for nations all over the world, is already affecting humankind, plants and animals through raising ocean levels, droughts & desertification and changing weather patterns. In addition to a wide range of policy measures implemented by national and state governments, it is necessary for individuals to understand the impact that their lifestyle may have on their personal environmental footprint, and thus over the global climate change. “My Footprint …

Modeling Spatially Varying Effects Of Chemical Mixtures, Jenna Czarnota

Theses and Dissertations

Cancer incidence is associated with exposures to multiple environmental chemicals, and geographic variation in cancer rates suggests the importance of accommodating spatially varying effects in the analysis of environmental chemical mixtures and disease risk. Traditional regression methods are challenged by the complex correlation patterns inherent among co-occurring chemicals, and the applicability of geographically weighted regression models is limited in the setting of environmental chemical risk analysis. In comparison to traditional methods, weighted quantile sum (WQS) regression performs well in the identification of important environmental exposures, but is limited by the assumption that effects are fixed over space. We present an …

Dispersal: A Multidisciplinary Investigation Of Plant Life, Alexandra E. Arzt

Theses and Dissertations

Using plants as a basis for exploring the interstices between the human and nonhuman, this thesis investigates ideas of awareness, intelligence, deep time, animism, and the fluctuating human perception of the agency of Nature. It outlines environmental art practices since the 1950s involving vegetal life. In addition, the paper provides a critical analysis of plant perception of Jakob von Uexküll’s work and theories of vital materialism and “critical plant studies” while noting recent studies in plant neurobiology. In my work, plants become active participants via their movement, seeding, and smell. This study takes the form of imitation, purposeful symbiosis, anthropomorphism, …

Green Relationship, Fadel Imad

Theses and Dissertations

Green Relationship is a design solution attempting to raise awareness toward the environment and reduce consumerism. Waste generation and pollution have become major concerns of many governments, municipalities, organizations and individuals around the world since they are affecting human wellbeing and the environment. As an MFA student with VCUQatar, I chose to use design to contribute in protecting the environment hoping to make a difference in life. The thesis includes a research and a design component. The research explores the recycling programs and facilities in Qatar, the governmental and private sector actions toward waste generation and collection, as well as …

Maternal Health And Child Behaviors As Risk Factors For Child Injury, Christina J. Nicolais

Theses and Dissertations

Evidence suggests that child behavior, parent mental health, parent supervision, and home environment conditions impact a child’s risk of injury. Vulnerable families are at greater risk for the occurrence of child behavior problems, poor health, decreased supervision, and hazardous home conditions. Consistent with a model that proposes that parent, child, and environment factors interact within the lens of sociocultural factors to predict injury, the current study aimed to test a statistical model with maternal physical health and child externalizing behaviors as predictors of child injury, and home hazards and supervision as mediators of these relations. Analyses were conducted using a …

Materials And Meaning, Michael Corigliano

Theses and Dissertations

Decisive moments and their fleeting experiences are born from an individual’s interaction within a defined physical space. It is here at the intersection of environment and context that my work in site-specific art begins. I endeavor to create an examination of socio-political and environmental issues through a manipulation of materials, thereby altering one’s private, communal, and cultural response to them. My installations are comprised of slip casted multiples which reference the human form. I place these forms in galleries and specific exterior locations, and incorporate materials that are charged with societal discord, such as used motor oil and post-consumer detritus, …

Outside Things, Jacob Sorenson

Theses and Dissertations

My thesis is a description of the issues encountered during the process of research and construction of the objects leading to, and consisting of, the work shown in Outside Things. The work is my attempt to gain personal insight into the complicated relationship between nature and culture. Through abstract furniture objects, floral patterns, and robots I explore the relationship between actual landscape and the constructed man-made bio-mimicry that convolutes the definition of Nature.

Determination Of Size Fractions And Concentrations Of Airborne Particulate Matter Generated From Construction And Demolition Waste Processing Facilities, Jason M. Young

Theses and Dissertations

Construction and Demolition (C&D) processing and recycling facilities accept waste materials that are generated during construction and demolition activities. The processing facility sorts, processes, and transfers the material to another operation. A consequence of these processes is the generation of particulate matter.This study involved quantifying and qualifying airborne particulates at three C&D processing facilities. Active stationary particulate sampling devices were employed to quantify the particle sizes of interest. Results were compared to United States Environmental Protection Agency (EPA) National Ambient Air Quality Standards(NAAQS) and United States Occupational Safety and Health Administration (OSHA)standards.The results from this study are not valid for …

Assessment Of Section 404 Wetland Mitigation Compliance And No-Net-Loss In The United States Army Corps Of Engineers, Norfolk District, Kimberley Anne Baggett

Theses and Dissertations

The United States Corps of Engineers is a federal agency responsible for regulating impacts to wetlands. Permit applications requesting authorization to impact wetlands are reviewed using a three step sequence: avoidance, minimization and compensatory mitigation. A national goal of no net loss of wetland acreage and function in compensatory mitigation has been recommended since 1987.Thirty Norfolk District projects requiring compensatory wetland mitigation in the permit years 1996-1998 were randomly selected for field review. The results showed that 10% of the project were never initiated or completed. Another 19% of the projects showed a net loss of acreage. However, many projects …

Public: An Exploration Of Community, Environment, And Technology, Christopher John Malven

Theses and Dissertations

This project examines the potential of computer technology to enhance navigation within, and incorporate information-sharing into, the public urban environment.