Taking part counts : Adolescents' experiences of the transition from inactivity to active participation in school based physical education

This is a pre-copy-editing, author produced PDF of an article accepted for publication in Health Education Research following peer review. The definitive publisher-authenticated version Brooks, F. and Magnusson, J. (2006) 'Taking part counts: Adolescents' experiences of the transition from inactivity to active participation in school based physical education'. Health Education Research 21 pp.872-883 is available online at: http://her.oxfordjournals.org/archive/index.dtl . --Copyright Oxford University Press --DOI : 10.1093/her/cyl006Peer reviewe

Dynamic response and stability of a composite prop-fan model

Results are presented for blade response and stability during wind tunnel tests of a 62.2 cm diameter model of a prop-fan, advanced turboprop, with swept graphite/epoxy composite blades. Measurements of dynamic response were made with the rotor mounted on an isolated nacelle, with varying tilt for nonuniform inflow, at flow speeds from 0.36 to 0.9 Mach number. The blade displayed no instabilities over the operating range tested, up to 0.9 Mach number and 10,000 RPM. Measurements are compared with those for other prop-fan models of both solid metal and graphite composite construction. The swept composite blade had less response than an unswept composite blade. Composite blades had more response than metal blades. Measurements are compared with theoretically based predictions. The 1-P blade response was significantly overpredicted using unimproved methods and somewhat overpredicted using improved methods. Unexpectedly high 2-P strain levels were measured and suggest the presence of nonlinear effects on blade response

BLACK FARMERS AND RURAL HEIR PROPERTY OWNERS: PUBLIC POLICY RESPONSE

Agricultural and Food Policy,

Effect of signal jitter on the spectrum of rotor impulsive noise

The effect of randomness or jitter of the acoustic waveform on the spectrum of rotor impulsive noise is studied because of its importance for data interpretation. An acoustic waveform train is modelled representing rotor impulsive noise. The amplitude, shape, and period between occurrences of individual pulses are allowed to be randomized assuming normal probability distributions. Results, in terms of the standard deviations of the variable quantities, are given for the autospectrum as well as special processed spectra designed to separate harmonic and broadband rotor noise components. Consideration is given to the effect of accuracy in triggering or keying to a rotor one per revolution signal. An example is given showing the resultant spectral smearing at the high frequencies due to the pulse signal period variability

Associations between physical activity in adolescence and health behaviours, well-being, family and social relations.

This is an Accepted Manuscript of an article published by Taylor & Francis Group in International Journal of Health Promotion and Education on 16 September 2014, available online at: https://doi.org/10.1080/14635240.2014.923287Across Europe and North America, few young people meet the recommended levels of physical activity (PA) of 1 hour of moderate to vigorous PA per day. However, the lives of young people cannot simply be polarised as either completely sedentary or active. Drawing on findings from the World Health Organization Health Behaviour in School-aged Children cross sectional international study, this paper examines the domains of adolescent life associated with young people's participation in overall PA, including health behaviours, social relationships and family activities. Consideration is also given to gender differences. Information in England was collected from 4404 students aged 11, 13 and 15 years, using anonymised self-completed questionnaires. Physical aspects of lifestyle were determined using internationally validated items for measuring PA that met international guidelines for activity and the frequency and duration of vigorous exercise undertaken during leisure activities. Separate analyses were conducted for boys and girls. Levels of PA and vigorous exercise were compared using the chi-squared test for trend. The findings draw attention to the value for the health and well-being of young people participating in some form of PA, even if they do not meet the recommended levels. Medium levels of PA appear to be associated with high levels of life satisfaction, self-rated health and an improved sense of body image. Significant health gains are likely to be made for adolescents in encouraging sedentary young people to undertake some form of PAPeer reviewedFinal Accepted Versio

An experimental evaluation of the application of the Kirchhoff formulation for sound radiation from an oscillating airfoil

The Kirchhoff integral formulation is evaluated for its effectiveness in quantitatively predicting the sound radiated from an oscillating airfoil whose chord length is comparable with the acoustic wavelength. A rigid airfoil section was oscillated at samll amplitude in a medium at rest to produce the sound field. Simultaneous amplitude and phase measurements were made of surface pressure and surface velocity distributions and the acoustic free field. Measured surface pressure and motion are used in applying the theory, and airfoil thickness and contour are taken into account. The result was that the theory overpredicted the sound pressure level by 2 to 5, depending on direction. Differences are also noted in the sound field phase behavior

Feasibility of making sound power measurements in the NASA Langley V/STOL tunnel test section

Based on exploratory acoustic measurements in Langley's V/STOL wind tunnel, recommendations are made on the methodology for making sound power measurements of aircraft components in the closed tunnel test section. During airflow, tunnel self-noise and microphone flow-induced noise place restrictions on the amplitude and spectrum of the sound source to be measured. Models of aircraft components with high sound level sources, such as thrust engines and powered lift systems, seem likely candidates for acoustic testing

Applying inspection to object-oriented software

The benefits of the object-oriented paradigmare widely cited. At the same time, inspection is deemed to be the most cost-effective means of detecting defects in software products. Why then, is there no published experience, let alone quantitative data, on the application of inspection to object-oriented systems? We describe the facilities of the object-oriented paradigm and the issues that these raise when inspecting object-oriented code. Several problems are caused by the disparity between the static code structure and its dynamic runtime behaviour. The large number of small methods in object-oriented systems can also cause problems. We then go on to describe three areas which may help mitigate problems found. Firstly, the use of various programming methods may assist in making object-oriented code easier to inspect. Secondly, improved program documentation can help the inspector understand the code which is under inspection. Finally, tool support can help the inspector to analyse the dynamic behaviour of the code. We conclude that while both the object-oriented paradigm and inspection provide excellent benefits on their own, combining the two may be a difficult exercise, requiring extensive support if it is to be successful