Polarization modes for strong-field gravitational waves

Strong-field gravitational plane waves are often represented in either the Rosen or Brinkmann forms. These forms are related by a coordinate transformation, so they should describe essentially the same physics, but the two forms treat polarization states quite differently. Both deal well with linear polarizations, but there is a qualitative difference in the way they deal with circular, elliptic, and more general polarization states. In this article we will describe a general algorithm for constructing arbitrary polarization states in the Rosen form.Comment: 4 pages. Prepared for the proceedings of ERE2010 (Granada, Spain

General polarization modes for the Rosen gravitational wave

Strong-field gravitational plane waves are often represented in either the Rosen or Brinkmann forms. While these two metric ansatze are related by a coordinate transformation, so that they should describe essentially the same physics, they rather puzzlingly seem to treat polarization states quite differently. Both ansatze deal equally well with + and X linear polarizations, but there is a qualitative difference in they way they deal with circular, elliptic, and more general polarization states. In this article we will develop a general formalism for dealing with arbitrary polarization states in the Rosen form of the gravitational wave metric, representing an arbitrary polarization by a trajectory in a suitably defined two dimensional hyperbolic plane.Comment: V1: 12 pages, no figures. V2: still 12 pages, reformatted. Minor technical edits, discussion of Riemann tensor added, two references added, no significant physics changes. This version accepted for publication in Classical and Quantum Gravit

Coaching and Mentoring Experiences of Early Career Extension Agents in Florida Received from County Extension Directors

County Extension directors (CEDs) are Extension agents who have both programmatic and administrative responsibilities. A critical role of Florida CEDs is to coach and mentor new Extension agents in their county office. Most literature surrounding the onboarding process of new Extension hires focuses on Extension agents within their first year on the job, with little attention on their subsequent years on the job. This study sought to understand the coaching and mentoring experiences of early career Extension agents (one to three years on the job) received from CEDs. Findings revealed eight major themes, including CED years of experience as an agent, lack of CED onboarding, and intentionality of meeting regularly. Overall, CEDs were substantially more optimistic about their early career agents’ coaching and mentoring experiences than the agents themselves, revealing a major difference in perception regarding the impact of this critical CED role. UF/IFAS Extension should provide more resources to create needed onboarding training for new CEDs and tools to help CEDs be more effective coaches and mentors for new and early career Extension agents

Prevention Program Sustainability and Associated Determinants: A Literature Review, Version 1.0

The Department of Homeland Security (DHS) has made millions of dollars available through the Targeted Violence and Terrorism Prevention (TVTP) Grant Program to help communities across the United States develop capabilities to combat terrorism and targeted violence. Given this investment, a key objective is ensuring the long-term impact of these programs, which depends on their sustainment beyond the initial grant. Thus, the purpose of this report is to review the relevant literature on program sustainability and discuss implications for the TVTP Grant Program. We began the review by exploring definitions of sustainability as well as similar social programming concepts, such as adaptation, scalability, and impact. Our review found no consensus definition for prevention program sustainability, suggesting the TVTP Grant Program should develop a bespoke definition guided by strategic program priorities and incorporating other social programming concepts as needed. We then examined the determinants, or factors related positively to long-term programmatic success, of sustainability. All determinants relate to capacity building at two levels: 1. Organizational (Internal). Internal organizational capacity is impacted by (a) internal stakeholder buy-in and engagement, (b) adequacy of personnel resources, particularly in terms of expertise, (c) the presence of ongoing evaluation activities to support adaptations, and (d) support from the funding agency. 2. Community (External). External community capacity is impacted by (a) external stakeholder buy-in and continued engagement beyond the initial award, and (b) the fit between the program offerings and community needs

LOFT-1 Mission: New Concepts For Educational and Commercial Spaceflight

The Launch Operations Flight Test One (LOFT-1) was originally conceived by E\u27Prime Aerospace Corporation (EPAC) of Titusville, Florida, as strictly an administrative pathfinder toward satisfying all governmental requirements for conducting commercial spaceflight activities from the Cape Canaveral Air Force Station (CCAFS). As the program progressed from early June 1987 toward the original launch date set in the Fall, the complexion of the flight changed dramatically to one of a bonafide scientific mission. Four individual educational/commercial organizations agreed to provide experiments. As such, LOFT-1 would mark the first launch of a privately developed and funded suborbital vehicle carrying payloads from the CCAFS. The University of Alabama in Huntsville, by way of participants within the Industrial and Systems Engineering Department, volunteered to serve as a focal point for all LOFT-1 payload design and integration tasks. In addition, UAH went on to design and develop its own experiment. Given only a few short months between conception of the mission and the originally planned flight date of October 1^, 1987, it was necessary to define a close-knit team, literally from across the nation, to make the mission possible within the original time constraint

Confronting an augmented reality

How can educators make use of augmented reality technologies and practices to enhance learning and why would we want to embrace such technologies anyway? How can an augmented reality help a learner confront, interpret and ultimately comprehend reality itself? In this article, we seek to initiate a discussion that focuses on these questions, and suggest that they be used as drivers for research into effective educational applications of augmented reality. We discuss how multi-modal, sensorial augmentation of reality links to existing theories of education and learning, focusing on ideas of cognitive dissonance and the confrontation of new realities implied by exposure to new and varied perspectives. We also discuss connections with broader debates brought on by the social and cultural changes wrought by the increased digitalisation of our lives, especially the concept of the extended mind. Rather than offer a prescription for augmentation, our intention is to throw open debate and to provoke deep thinking about what interacting with and creating an augmented reality might mean for both teacher and learner

Abilene Christian University: Faculty Open Access Policy

The University Library Committee (ULC) has drafted and approved the following policy in consultation with ACU Library leadership

Student Ensemble: University Band, Symphonic Band, and Symphonic Winds

Center for the Performing ArtsNovember 13, 2011Sunday Afternoon3:00 p.m

Pro-inflammatory cytokine/chemokine production by reovirus treated melanoma cells is PKR/NF-κB mediated and supports innate and adaptive anti-tumour immune priming

Background As well as inducing direct oncolysis, reovirus treatment of melanoma is associated with activation of innate and adaptive anti-tumour immune responses. Results Here we characterise the effects of conditioned media from reovirus-infected, dying human melanoma cells (reoTCM), in the absence of live virus, to address the immune bystander potential of reovirus therapy. In addition to RANTES, IL-8, MIP-1α and MIP-1β, reovirus-infected melanoma cells secreted eotaxin, IP-10 and the type 1 interferon IFN-β. To address the mechanisms responsible for the inflammatory composition of reoTCM, we show that IL-8 and IFN-β secretion by reovirus-infected melanoma cells was associated with activation of NF-κB and decreased by pre-treatment with small molecule inhibitors of NF-κB and PKR; specific siRNA-mediated knockdown further confirmed a role for PKR. This pro-inflammatory milieu induced a chemotactic response in isolated natural killer (NK) cells, dendritic cells (DC) and anti-melanoma cytotoxic T cells (CTL). Following culture in reoTCM, NK cells upregulated CD69 expression and acquired greater lytic potential against tumour targets. Furthermore, melanoma cell-loaded DC cultured in reoTCM were more effective at priming adaptive anti-tumour immunity. Conclusions These data demonstrate that the PKR- and NF-κB-dependent induction of pro-inflammatory molecules that accompanies reovirus-mediated killing can recruit and activate innate and adaptive effector cells, thus potentially altering the tumour microenvironment to support bystander immune-mediated therapy as well as direct viral oncolysis

ACU Faculty Library Committee Open Access Policy

All of the Authors were made up of individuals chosen by the Abilene Christian University Provost