Occupational Health and Industrial Hygiene Commons^™

Large-Scale Experimental Study On The Impact Of Air Cleaning & Ventilation On Indoor Air Quality And Student Illness-Related Absenteeism, Daud Nosham

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This large-scale randomized experimental field study investigated the effect of portable air purifiers (PAPs) on classroom’s air quality and student’s illness related absenteeism. PAPs were installed in 317 classrooms from various school districts located in Eastern Nebraska. The classrooms were randomly assigned into four conditions: three treatment conditions (T1, T2 & T3) and one control condition (device without any filter). T1 was equipped with HEPA filters, T2 added Activated Carbon (AC) layer to HEPA, and T3 further integrated Germicidal Ultraviolet (GUV) alongside HEPA and AC filters. The measured variables were carbon dioxide (CO2), fine particles (PN2.5) and coarse particles (PNcoarse), …

Spatial Hearing In Simulated Reverberant Classroom Environments, Gabriel Seth Evan Weeldreyer

Durham School of Architectural Engineering and Construction: Dissertations, Theses, and Student Research

Spatial hearing provides access to auditory spatial cues that promote speech perception in noisy listening situations. However, reverberation degrades auditory spatial cues and limits listeners’ ability to utilize these cues for segregating target speech from competing babble. Hence, spatial unmasking—an intelligibility benefit from a spatial separation between a target and masker—is reduced in reverberant environments as compared to free field. This work tests the hypothesis that interaural decorrelation, the result of increasing reverberation, will broaden the perceived auditory source width with a cascading effect of reduced auditory spatial acuity and subsequently poorer spatial unmasking. To understand the perceptual consequences of …

Seasonal Comparison Of Air Quality Variables And Evaluation Of Carbon Dioxide And Particulate Measurement Period In Classrooms, Daud Nosham

Durham School of Architectural Engineering and Construction: Dissertations, Theses, and Student Research

Indoor air quality and thermal environmental variables were measured in 55 classrooms in the mid-western United States spanning a full academic year. The studied air quality and environmental factors included carbon dioxide, temperature, relative humidity, particle counts, air velocity, formaldehyde, total volatile organic compounds, carbon monoxide, nitrogen dioxide, and ozone.

Carbon dioxide and Particulate matter concentrations were measured for a four-day measurement period. Then one-day, two-day, and four-day occupied time average concentrations were calculated which were then compared statistically to figure out an appropriate measurement period for these air quality variables. Kruskal Wallis test and Wilcoxon test were used to …

The Great Resignation: Narratives Of Mid-Career Teacher Burnout And Attrition, Nicole Burton

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

The COVID-19 pandemic has increased the issues of teacher attrition. According to the U.S. Bureau of Labor and Statistics, from January to November 2021, there was a 40% increase in the quit levels of teachers within the state and local education agencies (John, 2022). While prior research has examined early-career teachers leaving the profession, mid-career teachers have largely been left out of the conversation. This narrative inquiry investigates the reasons that mid-career teachers are leaving the profession. Semi-structured interviews were conducted with four mid-career teachers hailing from the Midwest region. Interviews focused on understanding how teachers have experienced stress and …

Safety, Stephen M. Vantassel, Brenda K. Osthus

Wildlife Damage Management Technical Series

Wildlife damage management (WDM) is an exciting field with many opportunities to provide solutions to the complex issues involved in human-wildlife interactions. In addition, WDM wildlife control operators (WCO) face a variety of threats to their physical well-being. Injuries can result from misused (Figure 1), faulty, or poorly maintained equipment, inexperience, mishandled wildlife, harsh weather, and dangerous situations, such as electrical lines. The goals of this publication are to: * Develop an awareness of safety issues and adopt a mindset of “Safety First”, * Review the major safety threats that WCOs face, * Provide basic information for WCOs to protect …

Stress: Effects And Management, Breanna Buscher

Nebraska College Preparatory Academy: Senior Capstone Projects

Stress is how the body reacts to any change in a person's life, as well as how it reacts in life or death situations. It is important everyone knows how to manage stress and what will happen if they do not. While there are an abundance of terrifying things that can happen when stress goes unmanaged, there are also plenty of easy ways everyone can keep their stress in check.

Stress can feel overwhelming and often cause health problems if gone unmanaged but luckily there are a plethora of ways to manage it.

Future Research: I would like to research …

Student Absenteeism And The Comparisons Of Two Sampling Procedures For Culturable Bioaerosol Measurement In Classrooms With And Without Upper Room Ultraviolet Germicidal Irradiation Devices, Chunxiao Su, Josephine Lau, Shawn G. Gibbs

Durham School of Architectural Engineering and Construction: Faculty Publications

Upper room ultraviolet germicidal irradiance (UVGI) has been shown to reduce the concentration of bioaerosols in controlled chambers. However, there is a lack of experimental results on the reduction of bioaerosol concentrations by UVGI devices in actual uncontrolled buildings. This study was carried out in an American elementary school in the Midwest. Two sampling procedures were carried out in six selected classrooms with similar dimensions that were separated into two groups: (1) UVGI exposure group and (2) non-UVGI control group. Two-stage Tisch culturable impactors were utilized to collect airborne culturable bacteria and fungi. Monthly samples were collected during unoccupied period …

The Burden Of Influenza-Like Illness In The Us Workforce, Y. Tsai, F. Zhou, I. K. Kim

United States Public Health Resources

Background -- The disease burden of influenza-like illnesses (ILIs) on the working population has been documented in the literature, but statistical evidence of ILI-related work absenteeism in the USA is limited due to data availability.

Aims -- To assess work absenteeism due to ILIs among privately insured employees in the USA in 2007–8 and 2008–9.

Methods -- We used the 2007–9 MarketScan® research databases. Full-time employees aged 18–64 years, with the ability to incur work absence and continuously enroled in the same insurance plan during each season were included. We identified ILI episodes using ICD-9 codes for influenza and …

Biodosepr-2006 Consensus Committee Report On Biodosimetric Methods To Evaluate Radiation Doses At Long Times After Exposure, Steven L. Simon, Ian Bailiff, André Bouville, Paola Fattibene, Ruth A. Kleinerman, David C. Lloyd, Stephen W.S. Mckeever, Alexander Romanyukha, Alexander V, Sevan’Kaev, James D. Tucker, Albrecht Wieser

Uniformed Services University of the Health Sciences

The requirements for biodosimetric techniques used at long times after exposure, i.e., 6 months to more than 50 years, are unique compared to the requirements for methods used for immediate dose estimation. In addition to the fundamental requirement that the assay measures a physical or biologic change that is proportional to the energy absorbed, the signal must be highly stable over time to enable reasonably precise determinations of the absorbed dose decades later. The primary uses of these biodosimetric methods have been to support long-term health risk (epidemiologic) studies or to support compensation (damage) claims. For these reasons, the methods …