Persuasion, Police, and Public Safety: Message Framing, Compliance, and Perceptions of Law Enforcement

In the everyday interactions between law enforcement and the citizens of their communities, officers attempt to gain compliance verbally, before resorting to physical force, if necessary. This dissertation examined the use of persuasive verbal messages by law enforcement officers when encountering citizens. These messages were created to represent a progression of asking, telling, and making, to gain compliance from an individual.;The officers in this study were university police officers, because university police departments are charged with providing a safe learning environment on campus. Due to the visible, community oriented policing in which university police departments tend to engage, it is likely that students would have an interaction with a campus police officer, and that this interaction might call for an officer to make a request or demand of the student. Furthermore, given the ubiquity of communication technology (e.g., social media) on college campuses, it is likely that police and students would communicate not only in-person, but also via computer-mediated channels.;The study in this dissertation utilized a 3 (ask, tell, make) X 2 (emergency, nonemergency) X 2 (face-to-face, computer-mediated communication) experimental design, in which participants (N = 190) were assigned randomly to one of 12 conditions. The measured outcomes were propensity to comply with a police officer, perceptions of the police officer, and perceptions of the officer\u27s conversational appropriateness.;Results indicated a significant main effect for message manipulation, such that participants rated perceptions of officer conversational appropriateness and perceptions of law enforcement more favorably when the hypothetical officer used an ask-framed message, rather than a make-framed message. Furthermore, the results indicated a significant main effect for communication channel, such that participants perceived the police officer to be more conversationally appropriate in the FtF condition than in the CMC condition. Additional post-hoc results, theoretical implications, practical applications, limitations, and future directions for research in this area of communication studies are discussed

Student learning with permissive and restrictive cell phone policies: A classroom experiment

Based on Finn and Ledbetter’s (2013; 2014) work regarding classroom technology policies, this experimental study examined the implementation of a permissive and a restrictive cellular phone policy in two sections of a public speaking course, and the effect of these policies on students’ cognitive and affective learning. College students (N = 31) were assigned to the permissive or restrictive cellular phone policy condition based on the class section of public speaking for which they registered for the Fall, 2016 semester. Results indicated that while there were no differences in cognitive learning, students in the restrictive policy condition reported greater affective learning for the instructor than did students in the permissive policy condition. Theoretical and practical implications, based on this surprising finding, also were discussed

Hydrodynamic motion of guiding elements within a magnetic switchyard in fast ignition conditions

Magnetic collimation via resistivity gradients is an innovative approach to electron beam control for the cone-guided fast ignition variant of inertial confinement fusion. This technique uses a resistivity gradient induced magnetic field to collimate the electron beam produced by the high-intensity laser–plasma interaction within a cone-guided fast ignition cone-tip. A variant of the resistive guiding approach, known as the “magnetic switchyard,” has been proposed which uses shaped guiding elements to direct the electrons toward the compressed fuel. Here, the 1D radiation-hydrodynamics code HYADES is used to investigate and quantify the gross hydrodynamic motion of these magnetic switchyard guiding elements in conditions relevant to their use in fast ignition. Movement of the layers was assessed for a range of two-layer material combinations. Based upon the results of the simulations, a scaling law is found that enables the relative extent of hydrodynamic motion to be predicted based upon the material properties of the switchyard, thereby enabling optimization of material-combination choice on the basis of reducing hydrodynamic motion. A multi-layered configuration, more representative of an actual switchyard, was also simulated in which an outer Au layer is employed to tamp the motion of the outermost guiding element of the switchyard

Are We Engaged? A College-level Inventory of Community Engagement

In this study, a team of six faculty members from Weber State University’s Telitha E. Lindquist College of Arts & Humanities tested and applied the Engaged College Rubric as part of a pilot program. Based on this application of the rubric, the committee found that the college tended toward the “Emerging” (i.e., first stage) classification for most items, thus indicating a need to continue developing programs and practices that center on community engagement (CE) within the college. The primary finding from this activity was that fragmentation exists surrounding CE in the college, within its constituent departments, and at the university level. This fragmentation limits the effectiveness of community-engaged learning, teaching, and scholarship. The committee’s findings, and interpretations of the rubric elements, are discussed, as are recommendations for future use of the Engaged College Rubric

Lagrangian Framework for Systems Composed of High-Loss and Lossless Components

Using a Lagrangian mechanics approach, we construct a framework to study the dissipative properties of systems composed of two components one of which is highly lossy and the other is lossless. We have shown in our previous work that for such a composite system the modes split into two distinct classes, high-loss and low-loss, according to their dissipative behavior. A principal result of this paper is that for any such dissipative Lagrangian system, with losses accounted by a Rayleigh dissipative function, a rather universal phenomenon occurs, namely, selective overdamping: The high-loss modes are all overdamped, i.e., non-oscillatory, as are an equal number of low-loss modes, but the rest of the low-loss modes remain oscillatory each with an extremely high quality factor that actually increases as the loss of the lossy component increases. We prove this result using a new time dynamical characterization of overdamping in terms of a virial theorem for dissipative systems and the breaking of an equipartition of energy.Comment: 53 pages, 1 figure; Revision of our original manuscript to incorporate suggestions from refere

Probabilities in the inflationary multiverse

Inflationary cosmology leads to the picture of a "multiverse," involving an infinite number of (spatially infinite) post-inflationary thermalized regions, called pocket universes. In the context of theories with many vacua, such as the landscape of string theory, the effective constants of Nature are randomized by quantum processes during inflation. We discuss an analytic estimate for the volume distribution of the constants within each pocket universe. This is based on the conjecture that the field distribution is approximately ergodic in the diffusion regime, when the dynamics of the fields is dominated by quantum fluctuations (rather than by the classical drift). We then propose a method for determining the relative abundances of different types of pocket universes. Both ingredients are combined into an expression for the distribution of the constants in pocket universes of all types.Comment: 18 pages, RevTeX 4, 2 figures. Discussion of the full probability in Sec.VI is sharpened; the conclusions are strengthened. Note added explaining the relation to recent work by Easther, Lim and Martin. Some references adde

A Cross-Sectional Survey of Potential Factors, Motivations, and Barriers Influencing Research Participation and Retention among People Who Use Drugs in the Rural USA

BACKGROUND: Despite high morbidity and mortality among people who use drugs (PWUD) in rural America, most research is conducted within urban areas. Our objective was to describe influencing factors, motivations, and barriers to research participation and retention among rural PWUD. METHODS: We recruited 255 eligible participants from community outreach and community-based, epidemiologic research cohorts from April to July 2019 to participate in a cross-sectional survey. Eligible participants reported opioid or injection drug use to get high within 30 days and resided in high-needs rural counties in Oregon, Kentucky, and Ohio. We aggregated response rankings to identify salient influences, motivations, and barriers. We estimated prevalence ratios to assess for gender, preferred drug use, and geographic differences using log-binomial models. RESULTS: Most participants were male (55%) and preferred methamphetamine (36%) over heroin (35%). Participants reported confidentiality, amount of financial compensation, and time required as primary influential factors for research participation. Primary motivations for participation include financial compensation, free HIV/HCV testing, and contribution to research. Changed or false participant contact information and transportation are principal barriers to retention. Respondents who prefer methamphetamines over heroin reported being influenced by the purpose and use of their information (PR = 1.12; 95% CI: 1.00, 1.26). Females and Oregonians (versus Appalachians) reported knowing and wanting to help the research team as participation motivation (PR = 1.57; 95% CI: 1.09, 2.26 and PR = 2.12; 95% CI: 1.51, 2.99). CONCLUSIONS: Beyond financial compensation, researchers should emphasize confidentiality, offer testing and linkage with care, use several contact methods, aid transportation, and accommodate demographic differences to improve research participation and retention among rural PWUD

Exponential martingales and changes of measure for counting processes

We give sufficient criteria for the Dol\'eans-Dade exponential of a stochastic integral with respect to a counting process local martingale to be a true martingale. The criteria are adapted particularly to the case of counting processes and are sufficiently weak to be useful and verifiable, as we illustrate by several examples. In particular, the criteria allow for the construction of for example nonexplosive Hawkes processes as well as counting processes with stochastic intensities depending on diffusion processes

The genetics of cortical organisation and development: A study of 2,347 neuroimaging phenotypes

Our understanding of the genetic architecture of the human cerebral cortex is limited both in terms of the diversity of brain structural phenotypes and the anatomical granularity of their associations with genetic variants. Here, we conducted genome-wide association meta-analysis of 13 structural and diffusion magnetic resonance imaging derived cortical phenotypes, measured globally and at 180 bilaterally averaged regions in 36,843 individuals from the UK Biobank and the ABCD cohorts. These phenotypes include cortical thickness, surface area, grey matter volume, and measures of folding, neurite density, and water diffusion. We identified 4,349 experiment-wide significant loci associated with global and regional phenotypes. Multiple lines of analyses identified four genetic latent structures and causal relationships between surface area and some measures of cortical folding. These latent structures partly relate to different underlying gene expression trajectories during development and are enriched for different cell types. We also identified differential enrichment for neurodevelopmental and constrained genes and demonstrate that common genetic variants associated with surface area and volume specifically are associated with cephalic disorders. Finally, we identified complex inter-phenotype and inter-regional genetic relationships among the 13 phenotypes which reflect developmental differences among them. These analyses help refine the role of common genetic variants in human cortical development and organisation