Study of fluid flow by charged particles

Analytical and experimental effort explores possibility of using charged particles as diagnostic tool in study of fluid flows. Test program involved right circular cylinder and airfoil located in large wind tunnel; ions were injected into flow and resulting currents at surfaces were monitored

Competing Stories of School and Community "Improvement”: Youth of Color's critical literacies and storytelling practices in a high school writing class

This practitioner research study uses qualitative data collection and analysis methods to explore student engagement with critical and multimodal literacy curriculum in the context of a writing course focused on storytelling. This research addresses the issue of deficit framing in schools serving Youths of Color and the negative characterizations that lead to assumptions about their learning capability based upon their racialized identity. As a result of these deficit discourses, Youths of Color are often positioned as at risk by educators, an assumption which often results in schools that lack intellectually robust and culturally relevant learning opportunities. In an effort to surface and disrupt deficit discourses, I looked to literacy theories such as critical, multimodal, and community literacies, which seek to expand the literacies valued in schools serving youth of color. To frame my inquiry, I asked: (1) What are students’ perspectives and inquiries regarding race, class, gender, and other social framings, and how do these change over time? and (2) How does this research inform my growing understanding of what it means to teach well? Over the course of one school year, I engaged with a group of 10 students in a school labeled as “in need of improvement” in a critically focused, multimodal storytelling curriculum designed to allow student interest and engagement with social issues as a guide for planning learning experiences. By collecting and analyzing student artifacts, discussion transcripts, interview data, and correspondence surrounding critical incidents over the course of the school year, I found that students used storytelling practices to critique social issues in both the surrounding city and the school community, displaying a plethora of Community Cultural Wealth which disrupts assumptions about Youths of Color. Despite this evidence of student Cultural Wealth, I found that the school culture was not a Culturally Sustaining atmosphere due to the over-reliance on compliance to district reform plans strictly aligned to discourses of standardization and accountability. These findings bridge the theory practice gap to help inform administrators, educators, and researchers alike by displaying the extensive daily effects societal education discourses have on students’ day-to-day educational experiences

Experimental Investigation into the Aerodynamic Performance of Both Rigid and Flexible Wing Structured Micro-Air-Vehicles

The Air Force Research Lab, Munitions Directorate, Eglin Air Force Base, Florida has designed a man-portable carbon-fiber Micro-Air-Vehicle (MA V) used for on-the-spot surveillance by Special Operations Forces (SOF) for enemy reconnaissance as well as post-strike Battle Damage Assessment (BDA).The main goals of this experiment are: 1) characterize the flow quality of the new AFIT 3\u27 x 3\u27 wind tunnel and 2) determine the aerodynamic performance characteristics of the 24 span, 6 chord flexible and rigid wing MA V s. The turbulent intensity of the wind tunnel was approximately 2%. Both MA Vs had an average lift slope within 3.5% of the theoretical value. Flexible wings deformed in response to perturbations in local flow field conditions, promulgating the delay of wing stall by nearly double. Aeroelastic effects begin to dominate low speed, laminar Reynolds number effects at tunnel velocities greater than 30 miles per hour. The flexible wing MA V displayed static stability in all three principal control axes (Pitch, Roll, Yaw), while the rigid MA V was not definitively stable in any axis. All flexible wing control surface configurations resulted in predictable and consistent performance between -10° and + 10° elevon deflection. Reponses declined steadily after ±10° showing dramatic direction changes

The use of the tethered satellite system to perform low density aerothermodynamics studies

The Tethered Satellite System (TSS) is a cooperative space system development activity of the U.S.A. and Italy. It is comprised of the Tether Satellite (TS) and the deployer. Within TSS, the Shuttle Tethered Aerothermodynamic Research Facility (STARFAC) concept has the potential to provide access to vast portions of the upper atmosphere for atmospheric and aerothermodynamic research. The feasibility and capability of the TSS to operate as a continuous open wind tunnel and to perform low density aerothermodynamic studies are investigated. This is accomplished through a modified version of the TS simulation program (SKYHOOK). The results indicate that STARFAC concept is both feasible and practical. The TS can go below 100 km but, if thrust is used, large velocity variation (delta V) maneuvers and an attitude control are required; if a satellite lift is considered, large tether tension is produced and an attitude control is required

Venous Thromboembolism Within Professional American Sport Leagues.

Background: Numerous reports have described players in professional American sports leagues who have been sidelined with a deep vein thrombosis (DVT) or a pulmonary embolism (PE), but little is known about the clinical implications of these events in professional athletes. Purpose: To conduct a retrospective review of injury reports from the National Hockey League (NHL), Major League Baseball (MLB), the National Basketball Association (NBA), and the National Football League (NFL) to take a closer look at the incidence of DVT/PE, current treatment approaches, and estimated time to return to play in professional athletes. Study Design: Descriptive epidemiology study. Methods: An online search of all team injury and media reports of DVT/PE in NHL, MLB, NBA, and NFL players available for public record was conducted by use of Google, PubMed, and SPORTDiscus. Searches were conducted using the professional team name combined with blood clot, pulmonary embolism, and deep vein thrombosis. Results: A total of 55 venous thromboembolism (VTE) events were identified from 1999 through 2016 (NHL, n = 22; MLB, n = 16; NFL, n = 12; NBA, n = 5). Nineteen athletes were reported to have an upper extremity DVT, 15 had a lower extremity DVT, 15 had a PE, and 6 had DVT with PE. Six athletes sustained more than 1 VTE. The mean age at time of VTE was 29.3 years (range, 19-42 years). Mean (±SD) time lost from play was 6.7 ± 4.9 months (range, 3 days to career end). Seven athletes did not return to play. Players with upper extremity DVT had a faster return to play (mean ± SD, 4.3 ± 2.7 months) than those with lower extremity DVT (5.9 ± 3.8 months), PE (10.8 ± 6.8 months), or DVT with PE (8.2 ± 2.6 months) (F = 5.69, P = .002). No significant difference was found regarding time of return to play between sports. Conclusion: VTE in professional athletes led to an average of 6.7 months lost from play. The majority of athletes were able to return to play after a period of anticoagulation or surgery. Those with an upper extremity DVT returned to play faster than those with other types of VTE. Further study is needed to look into modifiable risk factors for these events and to establish treatment and return-to-play guidelines to ensure the safety of these athletes