2,074 research outputs found
Aerodynamic shattering of liquid drops.
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76945/1/AIAA-1968-83-863.pd
Modelling of the Caspian Sea
More advanced models of climate systems are needed for use in present day weather
forecasting and climate projection, and there is a drive towards the use of coupled
modelling of various processes to achieve this goal. This thesis seeks to investigate
coupled ocean-atmosphere-wave modelling using the latest generation of models.
The test basin for this investigation is the Caspian Sea, where accurate representation
of the water budget is vital for prediction of water level changes, which have
historically seen trends of up to 15 cm/year.
The individual models of atmosphere, waves and ocean are first run separately to
investigate their skill in predicting observed conditions in the Caspian. These models
capture the behaviour of the basin when model results are compared with observed
wind speeds, currents, wave heights, sea-surface temperatures and precipitation.
The coupling of the ROMS ocean and WRF atmosphere models is seen to improve
sea-surface temperature prediction, but, under the Janjic Eta surface layer
scheme used here, increases evaporation above the level expected. The additional
inclusion of wave coupling from the SWAN model decreases strong winds through
wave dependent surface roughness, reduces sea-surface temperatures and increases
precipitation; all leading to better agreement with measurements. Wave prediction
is best when wave-atmosphere coupling is included, but not current-wave coupling
- this is believed to be because of the âdouble countingâ of currents, where they
are included both implicitly in the model formulation and then explicitly through
coupling.
The final part of this study considers near-inertial oscillations, which are frequently
observed in the measured current records. The model is able to accurately
represent the observations, and sees significant near-inertial oscillations over most
of the basin. The amplitude of the oscillations in the model is found to increase
with distance from the coastline. This agrees with the mechanism of barotropic
and baroclinic waves, which are generated by the no flow condition at the coast,
controlling inertial oscillations
Senator Joseph R. McCarthy and the American conservative tradition.
Source: Masters Abstracts International, Volume: 40-07, page: . Thesis (M.A.)--University of Windsor (Canada), 1984
The implementation of performance analysis and feedback within Olympic sport: the performance analystâs perspective
The study considered performance analysis and feedback from the perspective of the performance analyst through the investigation of the âwhatâ, âhowâ, and âwhenâ of practice within a selection of Olympic sports. Twenty-three performance analysts (experience 6.4 ± 4.1 years) engaged in a structured interview (85 ± 15 minutes) regarding their processes within applied practice. Likert scales (All the time, Often, Sometimes, Rarely, Never) were used to facilitate cross sport and environment comparison. The performance analysts highlighted the experience of their coaches as the most prominent feature influencing analysis direction and time had the greatest impact upon feedback provision. The main analysis techniques used were video, profiling and performance reports. Feedback was delivered primarily either, 1) < 1-hour post-performance within sessions lasting < 10-minutes or 2) the following day within sessions lasting 25+ minutes. Video feedback was usually coach led, however data delivery was more evenly distributed between coach and analyst. Very similar processes across the participants were identified, despite a wide variety of sports and participant experience levels. The findings have begun to illustrate practice within elite sport whilst highlighting the importance and need for further practitioner-based investigation regarding the use of performance analysis and feedback within applied context
Elite coachesâ use and engagement with performance analysis within Olympic and Paralympic sport
The use and implementation of performance analysis and feedback by 18 elite Olympic/Paralympic coaches (coaching experience 16.1 ± 7.4; experience using performance analysis 8.3 ± 4.8 years) was explored via an online questionnaire (mean time to complete = 29 minutes). Likert scales were used to facilitate cross-sport comparison. Comment boxes were included to enable additional information to be provided if deemed necessary. Training goals, athlete discussion and coaching philosophy were the most prominent features influencing analysis direction. Time available had the greatest impact upon feedback provision. The main analysis techniques used were video, performance reports, and trend analysis. Coaches with greater experience delivered significantly more feedback sessions within 1-hour of performance. Feedback sessions were < 20-minutes in duration and delivered in a balanced (experienced) or mostly positive (inexperienced) approach. Feedback was delivered consistently according to a preferred schedule, face-to-face, and within an individual format. Sessions were usually coach led, however considerable value in a combined or analyst led approach was demonstrated. The findings have begun to illustrate practice within elite sport from the perspective of a key user of performance analysis, i.e. the coach, and have clear implications for practitioners by identifying the key areas coachesâ value from performance analysis
Performance analysis practice within Olympic and Paralympic sports: a comparison of coach and analyst experiences
Concordance between 18 coaches (mean performance analysis experience: 8.3 ± 4.8 years) and 23 performance analysts (mean: 6.4 ± 4.1 years) regarding their performance analysis delivery within applied Olympic and Paralympic environments was investigated using survey-based methods. There was clear agreement on the provision, importance and need for full video. The majority of analysts (73.9%) provided profiling often or all of the time, whereas only one third of coaches felt that this was the required amount. Coaches not only agreed that coaching philosophy was the main factor directing analysis but also emphasised that training goals, level or age of athlete and discussions with athletes were influencers, far more than the analysts realised. A potential barrier for better communication was time, highlighted by all analysts as a major factor impacting their role. The majority of analysts (87%) attempted to provide feedback to athletes within one hour of performance, often or all the time. Coaches expressed a similar philosophy but were far more likely to want to provide feedback at later times. These findings should be utilised by analysts and coaches to review practice, identify gaps within practice and highlight areas for development
Infrared detection of HF tracer gas in inert and combusting flows.
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76842/1/AIAA-1972-70-159.pd
Democracy and power in alcohol premises licensing: A qualitative interview study of the Scottish public health objective: Power in alcohol premises licensing
Introduction and Aims There is international interest in how the availability of alcohol can be controlled to reduce harms. An objective of âprotecting and improving public healthâ was introduced to alcohol premises licensing in Scotland in 2005, resulting in public health actors engaging with licensing in new ways. We aimed to explore their experiences, including perceptions of the distribution of power, and constraints on their influence and that of the general public within the licensing system. Design and Methods Inâdepth, semiâstructured interviews were conducted with 13 public health actors who had recent and extensive experience of involvement in local licensing in 20 Scottish licensing jurisdictions. Interviews were audioârecorded and analysed using an inductive framework approach. Results Public health actors reported experiencing the licensing process as inherently unfair, with structures and traditions that were largely unhelpful to their efforts to support the public health objective. These included influence exerted by local officials, the formal and quasiâjudicial conduct of licensing meetings, and the disparity in resources available to public health actors versus licence applicantsâwith many larger applicants engaging specialist lawyers to represent their interests. The influence of public opinionâthrough, for instance, elected representativesâ perceptions of public attitudes, consultation exercises and local âlicensing forumsââwas seen as having a limited effect on decisionâmaking. Discussion and Conclusions Changes to Scottish alcohol licensing ostensibly designed to enhance democratic engagement and promote public health, were as yet insufficient to change the system, or empower stakeholders, to fully achieve those goals
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