A longitudinal analysis of start position and the outcome of World Cup cross-country mountain bike racing

For any athlete competing at the highest level it is vital to understand the components that lead to successful performance. World cup cross-country mountain biking is a complex sport involving large numbers of athletes (100-200) competing for positional advantage over varied off-road terrain. The start has been deemed a major part of performance outcome in such races. The purpose of the present study was to establish the relationship between start and finish position in cross-country mountain bike World Cup events over a 10 year (1997-2007) period and to make comparisons with a model manipulating start position based on predicted athletic capabilities. Data collection and comparisons included results from World Cup events from 1997 to 2007 (males and females), and modelled race data based on potential performance capabilities over the same period. Analyses involved the association of annual plus pooled start and finish position (Kendall's tau) along with banded mean, standard deviation for number of changes in position, while non-constrained linear regression enabled comparison between seasons. Actual race data showed significant positive correlations between starting position and finishing position (P < 0.01) in all cases but less than the model. A mean 57.4% (s = 5.6) of males changed < 15 positions, while 62.9% (s = 9.1) of females changed < 10 positions compared with modelled data (83.6%, s = 0.8 and 91.6%, s = 1.5 for males and females respectively). Individual season comparisons show general patterns to be identical (P > 0.05) for both males and females. In conclusion, finishing position is highly dependent on start position and strategies need to be devised for competing athletes to progress in the sport.     

Situational interest in physical education: a function of learning task design

Situational interest is the appealing effect of unique characteristics students recognize in a learning task during interaction with the task. It occurs when a learning task gives the learner a sense of novelty and challenge, demands high attention and exploration intention, and generates instant enjoyment during the person-task interaction. In this study, a repeated measure research design was used to examine the effects of task design on situational interest and the extent to which the effects were mediated by gender, grade, personal interest, and skill levels. Middle school students (N = 242) evaluated situational interest of four learning tasks with different cognitive and physical demands after having experienced the tasks in their physical education classes. Analyzed data showed that cognitive demand of a learning task played a critical role in generating situational interest. Grade levels, gender, and personal interest mediated the effects of task design on situational interest. But these mediation effects seemed rather limited. Physical skill levels had little influence on the effects of task design on situational interest. The findings seem to suggest that to enhance interestingness of a physical activity task, an option for physical educators may be to increase cognitive demand rather than reduce physical demand.     

A novel micropump droplet generator for aerosol drug delivery: Design simulations

One challenge of generating a liquid aerosol is finding an efficient way to break up bulk amounts of the compound into micron-sized droplets. Traditional methods of aerosol generation focus on the principle of creating the liquid droplets by blowing air at high speed over or through a liquid. In this study, a novel micropump droplet generator (MDG) is proposed based on a microfluidics device to produce monodisperse droplets on demand (DoD). The micropump design was employed to both pump the fluid into the air and to encourage droplet breakup and aerosol formation. Computational simulation modeling of the new MDG was developed and validated with comparisons to experimental data for current generators. The device was found to produce an aerosol similar to a vibrating orifice DoD device. Most importantly, the input power required by the newly proposed device (MDG) was several orders of magnitude below existing DoD generators for a similar droplet output. Based on the simulation results obtained in comparison with current DoD generators, the MDG device performed effectively at higher frequencies, smaller nozzle diameters, and regardless of the liquid viscosity of the solution.     

Assessing internet access and use in a medically underserved population: implications for providing enhanced health information services

Background: The relationship between health information seeking, patient engagement and health literacy is not well understood. This is especially true in medically underserved populations, which are often viewed as having limited access to health information. Objective: To improve communication between an urban health centre and the community it serves, a team of library and information science researchers undertook an assessment of patients’ level and methods of access to and use of the Internet. Methods: Data were collected in 53 face‐to‐face anonymous interviews with patients at the centre. Interviews were tape‐recorded for referential accuracy, and data were analysed to identify patterns of access and use. Results: Seventy‐two percentage of study participants reported having access to the Internet through either computers or cell phones. Barriers to Internet access were predominantly lack of equipment or training rather than lack of interest. Only 21% of those with Internet access reported using the Internet to look for health information. Conclusion: The findings suggest that lack of access to the Internet in itself is not the primary barrier to seeking health information in this population and that the digital divide exists not at the level of information access but rather at the level of information use.     

鱼和熊掌——雷纳德·兰黛的收藏与资本论

像很多买家一样,兰黛很小心,一说到收藏,就变得晦莫如深,他会说"我更愿意和你谈谈唇膏",或者开玩笑说他的收藏原则很简单—3个"哦"……雷纳德·兰黛除了是雅诗兰黛公司的所有者之外,还有很多美好的头衔,比如现代艺术博物馆主席、惠特尼博物馆的前任主席、纽约大都会博物馆的委托人等等。可以说,艺术品收藏一直是他的挚爱,同时也是他巨额财产的保护神。在过去三十年间,雷纳德·兰黛(Leonard A.Lauder)积累了大量顶尖藏品,其中多是立体主义,收藏的画家包括帕布罗·毕加索、乔治·布拉克、费尔南德·莱热等等。多年来,兰黛的收藏重点一直没怎么变过,照他的话说:"我很稳定,绝不会跟着时尚走。"