A study of swirling air flow in a converging nozzle

A study was conducted to determine the behavior of swirling air flow in a converging nozzle. Special instrumentation was constructed to obtain radial traverses of the flow at four axial positions. the data collected consisted of velocity, static pressure, and stagnation temperature. The flow pattern demonstrated the Ranque-Hilsh effect and reversed axial flow in the core region. As the flow entered the nozzle, it had the characteristics of a free vortex. At the exit plane the characteristics were those of a forced vortex. The converging nozzle caused an increase in the magnitude of the axial velocity component --Abstract, page ii

The Parthenon, April 26, 2012

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Putting the “learning” in “pre-learning”: effects of a self-directed study hall on skill acquisition in a simulation-based central line insertion course

Abstract Background Opportunities to practice procedural skills in the clinical learning environment are decreasing, and faculty time to coach skills is limited, even in simulation-based training. Self-directed learning with hands-on practice early in a procedural skill course might help maximize the benefit of later faculty coaching and clinical experience. However, it may also lead to well-learned errors if learners lack critical guidance. The present study sought to investigate the effects of a hands-on, self-directed “study hall” for central line insertion among first-year residents. Methods Learner cohorts before vs. after introduction of the study hall (n = 49) were compared on their pre- and post-test performance of key procedural behaviors that were comparable across cohorts, with all learners receiving traditional instructor-led training between tests. Results Study hall participants spent a median of 116 min in hands-on practice (range 57–175). They scored higher at pre-test (44% vs. 27%, p = .00; Cohen’s d = 0.95) and at post-test (80% vs. 72%, p = .02; Cohen’s d = 0.69). A dose–response relationship was found, such that 2 h of study hall were roughly equivalent to the performance improvement seen with four clinical observations or supervised insertions of central lines. Conclusions Self-directed, hands-on “study hall” supported improved procedural skill learning in the context of limited faculty availability. Potential additional benefits make the approach worth further experimentation and evaluation

The Future of the Firm: Centennial Lecture

Presented on January 21, 2009 from 6 to 7 pm in the Architecture AuditoriumModerators: Ellen Dunham-Jones ; George Heery. Speakers: Marvin Housworth (Arch 1963), Principal, KPS Group, Inc. ; Janice Wittschiebe (Arch 1978, M Arch 1980), Principal, Richard Wittschiebe Hand ; Kevin Cantley (Arch 1976; M Arch 1978), President & CEO, Cooper Carry, Inc. ; G. Niles Bolton (Arch 1968), Chairman & CEO, Niles Bolton Associates ; William H. Harrison (Arch 1971), Principal, Harrison Design Associates ; Bulent Baydar (Arch 1993, M Arch 1995) ; Cannon Reynolds (Arch 1993, M Arch 1996) ; George Heery (Arch 1951), Chairman & CEO, Brookwood Group ; David Goodman (Arch 2004, M Arch 2006) ; Susan Lineberry Barron (Arch 1997) ; Kahlillah Dotson Mosley (Arch 2004).Founders of some of Atlanta’s best firms shared the stage with a younger practitioner in their firm for a dialogue about past and future. Panel featured KPS Group/Richard Wittschiebe Hand/Cooper Carry/Niles Bolton Associates/Harrison Design Associates. Sponsored by KPS Group in honor of Marvin Housworth (Arch 1963)