Fixture facilitates helium leak testing of pipe welds

Fixture facilitates inspection testing of circumferential pipe welds for vacuum tightness, using helium gas as a leakage tracer in conjunction with a mass spectrometer. It consists of a split rubber torus and a mating clamping ring with a vacuum hose fitting

Adapted group yoga intervention, An: the lived experience of individuals with chronic traumatic brain injury

2017 Summer.Includes bibliographical references.The purpose of this qualitative phenomenological study was to explore the experiences of individuals with chronic traumatic brain injury (TBI) who participated in an adapted group yoga intervention. Participants attended one-hour yoga sessions twice a week for eight weeks and described their experiences through focus groups and individual interviews. Data accumulated were analysed using a coding process to generate themes of what experiences occurred, how experiences occurred, and why experiences occurred. Participants described experiencing the yoga intervention as a progression from initially expecting physical benefits from yoga to feeling safe and comfortable in the yoga intervention classes and among fellow participants, and to experiencing physical, emotional, and cognitive changes. Participants stated that these experiences carried over into their daily lives, positively impacting their health maintenance and social participation. Participants attributed their experiences to various structural strategies of the intervention including commonalities among participants, the instructor's dual knowledge of yoga and therapeutic rehabilitation, as well as the adaptability of yoga to their personal needs. Additionally, participant experiences were attributed to a re-conceptualization of what yoga should look and feel like, enhanced body awareness, and feeling supported. The fact that the participants generally expressed beneficial outcomes indicates the need to further research adapted yoga interventions for the population of individuals with chronic TBI

Effects of Enhanced Evaluative Feedback on Student Grades

The following hypothesis was developed to guide this study: 1. Students in the OTS 110T, Technology in Your World, class at Old Dominion University that receive enhanced evaluative feedback will earn higher grades than those students receiving normal feedback

The Pion-Photon Transition Form Factor and New Physics in the Tau Sector

Recent measurement of the $\gamma\gamma^\ast$ form factor of the neutral pion in the high $Q^2$ region disagrees with {\em a priori} predictions of QCD-based calculations. We comment on existing explanations, and analyze a possibility that this discrepancy is not due to poorly understood QCD effects, but is a result of some new physics beyond the standard model (SM). We show that such physics would necessarily involve a new neutral light state with mass close to the mass of $\pi^0$, and with stronger than $\pi^0$ couplings to heavier SM flavors such as $c$, $\tau$, and $b$. It is found that only the coupling to the $\tau$ lepton can survive the existing constraints and lead to the observed rise of the pion form factor relative to $Q^{-2}$ at high $Q^2$. We perform numerical fits to data and determine the allowed range of masses and couplings for such new particles. This range of masses and couplings could also reduce or eliminate the tension between the $e^+e^-$ and $\tau$ decay determinations of the hadronic vacuum polarization. Dedicated experimental analysis of $\tau$ pair production in association with such new states should provide a conclusive test of the new physics hypothesis as an explanation to the pion form factor rise. We also comment on the calculations of the pion form factor in the chiral quark model, and point out a possible dynamical origin of the quark mass scale inferred from the form factor measurement.Comment: 13 pages, 6 figures, revtex4-1; v2: additional references, improved discussion of pion mixing case, published versio

Tau and muon pair production cross-sections in electron-positron annihilations at sqrt{s} = 10.58 GeV

The calculational precision of \ee\to\tautau and \ee\to\mumu production cross-sections in electron-positron annihilations at \roots = 10.58 \gev are studied for the \kk Monte Carlo simulation program. We determine \sigma(\ee\to\tautau) = (0.919 \pm 0.003) \nb and \sigma(\ee\to\mumu) = (1.147 \pm 0.005) \nb, where the error represents the precision of the calculation.Comment: 7 pages, 3 tables, 1 figure (published in Physical Review D 77, 054012 (2008)

Career perceptions of undergraduate tourism students: A case study in Turkey

Cataloged from PDF version of article.The characteristics of tourism employment and careers have been widely documented. Although the development of the tourism industry can create new employment opportunities, it is often criticised for providing primarily low-skilled and low-paying jobs. If today's students are to become the effective practitioners of tomorrow, it is fundamental to understand their perceptions of tourism employment. This paper focuses on a sample of 450 Turkish students studying tourism at university level in order to analyse their perceptions towards tourism careers. The results showed that, overall, the respondents' perceptions are neither favourable nor unfavourable. The findings also indicated that: willingness to study tourism; willingness to work in tourism after graduation; and work experience; are important factors in shaping their image of tourism careers

A note on the probability of generating alternating or symmetric groups

We improve on recent estimates for the probability of generating the alternating and symmetric groups $\mathrm{Alt}(n)$ and $\mathrm{Sym}(n)$. In particular we find the sharp lower bound, if the probability is given by a quadratic in $n^{-1}$. This leads to improved bounds on the largest number $h(\mathrm{Alt}(n))$ such that a direct product of $h(\mathrm{Alt}(n))$ copies of $\mathrm{Alt}(n)$ can be generated by two elements

Hand-operated plug insertion valve

Hand-operated plug insertion valve seals an evacuated insulation system for upper stage liquid hydrogen tanks on the launch pad. It is light in weight, demountable, and permits evacuation of the system plus sealing after evacuation

Using Graduation Rates to Develop Recruitment Strategies at Purdue University

This is the published version of the book chapter, made available with the permission of The American Association of Collegiate Registrars and Admissions Officers. The entire volume is available from the publisher: http://www4.aacrao.org/publications/catalog.php?category=13