Open Research Oklahoma (Oklahoma State Univ.)
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Examining recreational and medical motivations to use cannabis in the context of the medical cannabis market
No full textCannabis use in the United States has grown significantly, particularly among college aged students, relating to factors such as decreased risk perceptions and increased state legalization. This study examines motivations for cannabis use among college students in the uniquely permissive cannabis market of Oklahoma. A total of 429 participants from a large public university completed an online survey assessing cannabis use behaviors, medical cannabis license status, and motivations for use. Motivations were measured using an adapted version of the Marijuana Motives Questionnaire (MMQ), incorporating additional items related to medical motivations.
Results revealed that while 63.6% of participants reported lifetime cannabis use, only 17.6% possessed an active medical cannabis license. Factor analysis identified six motivation categories: medical, coping, expansion, enhancement, social, and conformity. Among those using cannabis, the most frequently endorsed motivations were enhancement (84.5%), coping (83%), and medical use (77.4%). Significant differences emerged between licensed and non-licensed users, with license holders reporting higher rates of medical, coping, and expansion motivations, while non-license holders endorsed higher conformity motivations. However, no significant differences were found for social or enhancement motivations, suggesting that these motivations are common regardless of licensure status.
Findings support the need for updated cannabis motivation measures that include medical motivations, reflecting the evolving cannabis market. The study highlights the blurred boundaries between medical and recreational use and underscores the importance of understanding cannabis use motivations in college populations. Future research should explore these patterns in more diverse populations to enhance measurement accuracy and inform policy discussions
Application of auxetic structures in 3D printed force sensors and pressure mapping
No full textDespite being a well-developed technology, the application of pressure mapping is limited due to the cost of these systems. This research aims to expand the use of pressure mapping by decreasing the cost of fabrication, specifically by focusing on decreasing the cost to manufacture the individual force sensors through the application of auxetic structures, which are a type of meta-material that possesses a negative Poisson’s Ratio, resulting in the structure collapsing inwards on itself under compression. These structures have been found to exhibit unique properties such as increased energy absorption, better vibrational dampening, and increased uniformity in its compressive deformation, and have been used in this research to develop a new piezoresistive sensor that is compatible with FDM printing. This research investigated the effect of auxetic structures in compressive piezoresistive force sensors and found that a force sensor with auxetic structures have increased linearity and sensitivity alongside being more cost-effective than commercially available force sensors. Furthermore, this research outlines the development of a cost-effective pressure map that utilizes a 6x6 array of force sensors
Unsettling Sexuality: Queer Horizons in the Long Eighteenth Century
No full textUnsettling Sexuality: Queer Horizons in the Long Eighteenth Century challenges the traditional ways that scholarship has approached sexuality, gender nonconformity, and sex (as well as its absence) in the long eighteenth century. Drawing from recent and emerging criticisms in Middle-Eastern and Asian studies, Black studies, and Native American and Indigenous studies, the collected authors perform intersectional queer readings, reimagine queer historiographic methods, and spearhead new citational models that can invigorate the field. In charting multidirectional queer horizons, this collection locates new prospective desires and intimacies in the literature, culture, and media of the period to imagine new directions and simultaneously unsettle eighteenth-century studies.
This book is also freely available online as an open access digital edition on Manifold, here: https://openpub.udel.edu/projects/unsettling-sexuality.Englis
Joint spending failures: Joint Strike Fighter program's fiscal, technical, and build up challenges
No full textThis research analyzes the fiscal costs and lifecycle costs of the F-35 and of Joint Strike Fighter program. This program has developed the most advanced aircraft in the world regarding stealth and technological capabilities. However, the lack of an agreed fiscal model to properly budget the program between the United States government and Lockheed Martin has driven the costs of the program well over one to two trillion dollars, with a five hundred-billion-dollar margin of error in calculating lifecycle costs. The technical shortcomings in logistical management and available manpower made Lockheed Martin and the Department of Defense underestimate the overall long-term costs of the program. With the reliance on the F-35 as the only option for the United States military moving forward in joint service air defense, replacing the F-35 is impossible and only supplementing future purchases with improved existing designs of the F-18E/F and drone seems to be the way forward in curving the rising costs. Due to these factors, Joint Strike Fighter program and the F-35 has become the most expensive military megaproject in the world
Thermal responses of heat shock protein expression in juvenile sea lampreys and green tree frogs
No full textEctotherms, such as sea lampreys and green tree frogs, have high sensitivity to external temperatures as a means of regulating their body heat, so even small temperature changes can disrupt their cellular functions. While heat shock protein (HSP) expression has been widely used as an indicator of thermal stress, their expression in these ectotherms has been a critically underrepresented phenomenon. The hypotheses are that juvenile sea lampreys will exhibit HSP responses corresponding to the temperature intensity to which they are exposed, and that green tree frogs will show a significant difference in HSP expression at their critical thermal minimum (CTmin) compared to their critical thermal maximum (CTmax). The questions I aim to answer are: Which HSPs in lampreys show significant responses at higher temperatures? And what is the lowest thermal limit at which HSPs are significantly expressed in green tree frogs? Heart tissue samples were taken from sea lampreys exposed to temperatures ranging from 20-29°C. Heart and muscle tissue samples were obtained from individuals in both expanded and core populations following thermal tolerance trials in green tree frogs. A CTmax experiment exposed both species to increasing temperatures, and decreasing temperatures for green treefrogs (CTmin), until a loss of equilibrium and righting reflex was detected, respectively. Heat shock protein levels and gene expression were then measured through quantitative real-time polymerase chain reaction (qPCR). Several isoforms of hsp70 and hsp90 were identified and showed various degrees of upregulation during heat exposure in lampreys. For green tree frogs, there was no significant difference in hsp induction between populations at both upper and lower thermal limits. These experiments demonstrate that the physiology of these ectotherms is intact and can be used as a model for understanding the evolution, immune responses, and potential biomarkers for thermal stress responses during a time of increasing global temperatures
Interrater reliability of rape characteristics
No full textThe study aimed to address the lack of consensus among investigators regarding the importance of various characteristics during an investigation. To address the issue, a rating sheet consisting of various aspects of rape characteristics was created. The study employed an interrater reliability test and descriptive statistics analysis to evaluate the consistency and importance of these characteristics. The findings reveal that investigative actions, such as interviews with victims or suspects and the collection and analysis of forensic evidence (e.g., DNA, semen, video evidence), are considered the most important characteristics during investigations. These elements are necessary for identifying offenders, progressing cases, supporting victim allegations, and linking suspects to crimes. Conversely, characteristics such as gender of the officer, the suspect's marital status (whether divorced, widowed, separated, or married), the victim's criminal history (including having a criminal record, gang affiliation, or undergoing a police criminal check), and the number of charges filed in report are considered as the least important characteristics during an investigation. These factors may not directly influence the outcome of investigations. The study also examines the level of agreement among raters, revealing an overall Gwet's AC1 coefficient 0.132 by all raters, indicating slight agreement on the importance of various aspects of rape characteristics. In conclusion, the study provides insights into raters' perspectives on rape characteristics, emphasizing the importance of investigative actions and forensic evidence in the investigation process. It highlights the influence of individual factors on analysis and underscores the need for objective, evidence-based approaches to reduce subjective biases. Law enforcement agencies should implement group-specific training programs to address these biases and utilize the identified characteristics to plan new investigative strategies for future rape investigations. Additionally, policymakers can utilize the study's findings to develop standardized guidelines and protocols to ensure all police officers use the same procedures when assessing rape investigations
Investigation of aerodynamic performance of coaxial propeller
No full textCoaxial propeller systems, which feature two superimposed, counter-rotating propellers, are increasingly used in unmanned aerial vehicles (UAVs) for their superior speed, maneuverability, and load-carrying capabilities. These configurations allow for compact, efficient designs that are particularly well-suited for vertical take-off and landing applications. However, despite their growing popularity, the aerodynamic interactions between the front and rear propellers remain underexplored, largely due to the complexity of the flow phenomena involved and the absence of experimental setups capable of isolating and accurately measuring individual propeller performance within a coaxial system. To address this challenge, a dual experimental approach has been developed to enable detailed aerodynamic analysis of coaxial propeller configurations under varying flow conditions. The first setup consists of a custom-built hover test stand designed to allow precise, independent control and measurement of thrust, torque, and power for each propeller in a static environment. The second setup involves a wind tunnel dynamometer integrated into a 3 ft × 3 ft × 8 ft subsonic test section, capable of accommodating propellers up to 18 inches in diameter. It features a concentric shaft configuration, where the rear propeller is driven by a hollow outer shaft and the front propeller by a solid inner shaft. The system utilizes a combination of through-hole and biaxial load cells to capture individual performance metrics, enabling controlled experiments under axial inflow to simulate forward flight conditions. These complementary experimental platforms provide a comprehensive foundation for evaluating coaxial rotor performance across multiple flight regimes. The data collected will be used to study rotor-rotor aerodynamic interference in depth, guiding design optimization for efficiency and stability. Future efforts will incorporate Physics-Informed Machine Learning (PIML) to develop robust predictive models. By integrating experimental, computational, and theoretical methods, this research aims to advance the understanding of coaxial aerodynamics and contribute to the development of high-performance propulsion systems for UAVs, eVTOLs, and next-generation rotorcraft
Basin modeling, structural evolution, and hydrocarbon source rock thermal maturation in the Ardmore Basin, southern Oklahoma
No full textThis study analyzes two dimensional (2D) seismic profiles and well logs to examine the subsurface of the Ardmore Basin in southern Oklahoma, focusing on the hydrocarbon-rich Harrisburg Trough and Berwyn Syncline. The basin’s complex structure results from multiple orogenic events and associated phases of subsidence. During the Cambrian–Ordovician, thermal subsidence resulted in flat-lying stratigraphy. Seismic data provide little evidence linking the basin to an extensional aulacogen; instead, right-lateral oblique-slip appears more likely. Major faults, such as the Healdton Fault, appear to be rooted in an Iapetan mid-crustal detachment.
Deformation in southern Oklahoma was influenced by far-field stresses from Appalachian orogenies, reactivating shear zones. The earliest deformation was reverse faulting in the Middle–Late Ordovician, likely driven by the Taconic Orogeny. Significant structural changes began in the Late Devonian with the First Wichitan Orogeny, related to stresses from the Rheic Ocean and Acadian Orogeny. Devonian–Pennsylvanian time was marked by synsedimentary growth of oblique-slip faults and folds. By the Late Pennsylvanian, deformation had largely ceased, save for minor left-lateral faulting linked to the Arbuckle Orogeny. Post-Permian tectonic activity was minimal, with no Triassic or Jurassic strata preserved. Cretaceous strata, preserved in the southeast, record tilting related to the Gulf of America Basin.
This study presents the first modern basin modeling of the Ardmore Basin, using 12 burial history models in addition to a 2D model of the Harrisburg Trough to assess the thermal maturity of Woodford and Caney shale. The models reveal episodes of subsidence and uplift influenced by major tectonic events. Rapid Late Mississippian–Permian subsidence (>250 m/m.y.) suggests elevator basin behavior. Thermal maturity (0.4–2.0% Ro) varies by structural position, with deep synclines having higher thermal maturity than shallower structures.
Basin modeling confirms burial depth and heat flow influenced hydrocarbon generation. The Woodford Shale in the Harrisburg Trough acted as a thermal insulator, enhancing thermal maturity. The Carboniferous thermal pattern was synkinematic and became post-kinematic in the Permian
Qualitative critical content analysis of five Belizean young adult short stories: Exploring a diasporic narrative
No full textThrough critical content analysis, this qualitative study analyzes five Belizean young adult short stories published between 1997 and 2019 to explore how youth and Belizean culture are represented. Given the limited inclusion of contemporary Belizean literature in Belize's school curricula, this dissertation argues for a more intentional selection of culturally relevant texts that authentically reflect the lived experiences of contemporary Belizean youth. The literature review examines Caribbean and Belizean literature research, focusing on intertextuality, diaspora, and youth lens frameworks. The study engages constructionism as its epistemological stance, intertextuality as a literary theory, and critical content analysis to explore how the selected texts shape and reflect power dynamics within the Belizean sociocultural context and diaspora. The study identifies three central themes within the texts: 1) change often forces individuals to adapt, leading to new skills and perspectives; 2) adult friendships/relationships can provide emotional stability and support, helping youth feel valued and understood, which is essential for their self-esteem and leadership potential; and 3) intertextual dialogue and physical expressions allow for diasporic youth to experience a unique interplay of belonging. The findings uncover the importance of including contemporary Belizean youth literature in secondary classrooms that is more critical of colonialism. Via the study, I propose a framework for selecting texts that affirm the identities and experiences of today's Belizean youth. This research contributes to broader discussions of youth representation, literary inclusion, and culturally relevant education in Belize and the Caribbean
Exploring narratives of "failure": The lived experiences of educational administrators
No full textThis study explores the lived experiences of failure among Oklahoma K12 administrators through the lens of Curriculum as Lived Experience theory. The purpose of this research is to examine how administrators experience and make meaning of failure within complex, discursive, educational landscapes. Using narrative inquiry, four administrators engaged in storytelling through a written prompt, one-on-one conversations, and a chosen artifact. Layering narrative, emotional, and poetic analyses enables this study to illuminate the situated realities of administrators. Findings reveal multiple, often conflicting and hidden, failure discourses that shape administrators’ experiences. These discourses, frequently institutional, systemic, and hidden, can act as forms of slow violence, harming those who differ. However, narrators demonstrated agency, reinterpreting and resisting failure discourses through their own meaning-making practices. Ultimately, this research advocates for shared failure conversations to humanize and contextualize administrative life. By engaging with diverse failure stories, this study challenges deficit framing and invites more humanizing, authentic understandings of and conversations with educational leadership