Left turn movements are considered to be the highest risk movements through an intersection, and can result in head on, angle, or side impact crashes. The flashing yellow arrow (FYA) for use as a permissive left turn phasing indication is relatively recent, first appearing in the 2009 edition Manual on...
Introduction: For people with bleeding disorders pain is often a daily challenge. Despite many advancements to the standard of care in recent decades, including more effective treatments, and more effective medication schedules, pain remains highly prevalent in people with bleeding disorders: existing pain treatment practices have not adequately addressed pain...
Beginning in the late-nineteenth century, several dialogues emerged concerning life on Mars. Some supported the notion of an inhabited Mars, citing recent observations of the planet, while others, pointing to a lack of concrete evidence, denied the validity of such a bold hypothesis. The dialogues within and between different...
Objective: To describe associations between self-reported general health status, chronic conditions, and use of supplements containing botanicals (SCB) and describe reasons for use among U.S. adult supplement users.
Design: Cross-sectional analysis using data from the 2009-2014 National Health and Nutrition Examination Survey (NHANES). Information on self-reported dietary supplement use and...
As life expectancy continues to rise, adults over 65 are one of the fastest-growing age groups in the United States. As we have made significant strides in mitigating disease, we now have to consider health states that lead to disablement and the inability to age-in-place, including falls, frailty, functional mobility,...
The illicit use of prescription stimulants (IUPS) is a critical Public Health problem in the college population that represents a unique form of substance use. Namely, the primary motives for IUPS by college students are academic in nature (e.g., Teter, McCabe, LaGrange, Cranford, & Boyd, 2006), which may explain why...
The characterization of the seismic performance of structures relies on numerical simulations. However, estimates of seismic response are subject to various sources of uncertainty, including modeling uncertainty. This research estimated the response of two full-scale structural specimens composed of a moment resisting frame, elastic spines, and force-limiting connections (FLC), which...
While real-time hybrid simulation has been utilized for structures subjected to seismic events for decades, its use in fluid-structure interaction problems is still a novel endeavor. Gathering data for cascading seismic and tsunami events is difficult due to space constraints in existing experimental facilities, complications regarding the application of scaling...
Aligning Real-Time Networks (RTNs) with the National Spatial Reference System (NSRS) is crucial to ensure accuracy, consistency, interoperability, and long-term data integrity for geospatial applications. However, the effectiveness of different alignment methods as well as the need for monitoring approaches to maintain alignment consistency with the NSRS have not yet...
Public concern has recently focused upon the presence
of radioactive radon in homes. The Environmental
Protection Agency and others have researched this health
hazard. Radon gas is given off during typical household
water uses such as showering, bathing, dishwashing, and
clothes washing. However, few studies have been performed
on radon...
Twenty-four woven Pre-Columbian textiles in the
Apparel, Interiors and Merchandising Department (AIM) of
Oregon State University were reported to be from Ancon,
Peru. A methodology was developed to confirm the exact
provenance of the AIM textiles. Technical fabrication
characteristics were utilized to describe certain known
Ancon woven textiles and to...
This study examined the effect that three environmental
hues had on subjects' work performance and on mood levels of
anxiety, depression, and arousal in an office work environment.
Pre-test post- test measurements of differences in work performance
and mood levels were used to test twelve hypotheses. Work
performance was measured...
This work analyzes the numerical curvature of buckling braces. An existing brace modeling learning tool, which in its current state allows users to change the inputs within a simulated model of a braced element, was modified to display the curvature diagram. The curvature diagram was verified through comparison to existing...
Traditional braced frames are an efficient and economic means of resisting seismic demands. However, braced frames are prone to story mechanisms, which can result in concentrations of demands and damage during seismic events. Including steel strongbacks in conjunction with traditional braced frames can mitigate story mechanisms. The SBF results in...
The word orogenesis is derived from the Greek words oros meaning mountains and genesis meaning creation and refers to the study of the complex processes involved in the growth and evolution of mountain ranges (orogens). Orogens develop where crustal deformation builds topography and forms landscapes. This dissertation explores the role...
In probability and statistics, Simpson’s paradox is an apparent paradox in which a trend is present in different groups, but is reversed when the groups are combined. Joel Cohen (1986) has shown that continuously distributed lifetimes can never have a Simpson’s paradox. We investigate the same question for discrete random...
Graduate teaching assistants (GTAs) from science, technology, engineering, and mathematics (STEM) are important in the teaching of undergraduate students (Golde & Dore, 2001). However, they are often poorly prepared for teaching (Luft, Kurdziel, Roehrig, & Turner, 2004). This dissertation addresses teaching effectiveness in three related manuscripts:
1. A position paper...
The groundfish trawl fishery operating off the coasts of Oregon
and Washington 1985-1987 caught six major assemblages of species
which could be treated as units in developing mixed-species
management plans. Eighty-one percent of the tows observed on
commercial vessels were consistently placed in one of the assemblage
designations using three...
H₂-uptake positive strains (122 DES and SR) and H₂-uptake negative strains SR2 and SR3 of Rhizobium japonicum were examined for ribulosebisphosphate (RuBP) carboxylase and H₂-uptake activities during growth conditions which induced formation of the hydrogenase system. The rate of ¹⁴CO₂ uptake by hydrogenase-induced cells was about six times greater in...