Electronic detection of dielectrophoretic forces exerted on particles flowing over interdigitated electrodes     

Nikolic-Jaric M  Romanuik SF  Ferrier GA  Cabel T  Salimi E  Levin DB  Bridges GE  Thomson DJ 《Biomicrofluidics》2012,6(2):24117-2411715

Dielectric particles flowing through a microfluidic channel over a set of coplanar electrodes can be simultaneously capacitively detected and dielectrophoretically (DEP) actuated when the high (1.45 GHz) and low (100 kHz–20 MHz) frequency electromagnetic fields are concurrently applied through the same set of electrodes. Assuming a simple model in which the only forces acting upon the particles are apparent gravity, hydrodynamic lift, DEP force, and fluid drag, actuated particle trajectories can be obtained as numerical solutions of the equations of motion. Numerically calculated changes of particle elevations resulting from the actuation simulated in this way agree with the corresponding elevation changes estimated from the electronic signatures generated by the experimentally actuated particles. This verifies the model and confirms the correlation between the DEP force and the electronic signature profile. It follows that the electronic signatures can be used to quantify the actuation that the dielectric particle experiences as it traverses the electrode region. Using this principle, particles with different dielectric properties can be effectively identified based exclusively on their signature profile. This approach was used to differentiate viable from non-viable yeast cells (Saccharomyces cerevisiae).  相似文献   

100 Pioneers: African-Americans Who Broke Color Barriers in Sport,R. Lapchick,Fitness Information Technology,Morgantown, WV (2008), 488 pp., RRP,Price: US$ 24.95, ISBN: 978-1885693815     

Sean Gorman 《Sport Management Review》2009,12(4):267-268

  相似文献   

Designed by the pupils,for the pupils: an autism‐friendly school     

Keith McAllister  Sean Sloan 《British Journal of Special Education》2016,43(4):330-357

There is growing interest in promoting autism‐friendly environments, especially in a school setting. Findings to date have generally advocated an accepted reductionist or generalist approach when providing an autism‐friendly built environment. However, previous studies, while very well intentioned, have rarely involved those with autism spectrum condition (ASC) to comment on and then instruct designers on what, for them, constitutes an autism‐friendly learning environment. If going to be truly inclusive, the authors contend that those who are most knowledgeable about ASC, those with ASC, should, whenever possible, be given the opportunity to comment on the design of our shared built environment. Hence this article first introduces some of the challenges faced by those with ASC in trying to cope with their surroundings, before proceeding to outline the development of a simple school design ‘jigsaw’ kit that helped pupils with ASC to communicate ideas for their perfect school. Used in four design workshops, secondary school aged pupils (aged 13 to 18) with ASC imparted their likes, dislikes and what was most important to them within the school environment. This facilitated comparison with current autism‐friendly guidelines and provides a valuable insight into the mind of the secondary pupil with ASC. It is hoped that by increasing awareness and then including those with ASC in describing what might constitute an autism‐friendly learning environment, it will help facilitate greater inclusion of the child with ASC into mainstream education and society at large.  相似文献   

Maximal oxygen uptake versus maximal power output in children     

Dencker M  Thorsson O  Karlsson MK  Lindén C  Wollmer P  Andersen LB 《Journal of sports sciences》2008,26(13):1397-1402

Maximal oxygen uptake VO(2max)) is considered the optimal method to assess aerobic fitness. The measurement of VO(2max), however, requires special equipment and training. Maximal exercise testing with determination of maximal power output offers a more simple approach. This study explores the relationship between [Vdot]O(2max) and maximal power output in 247 children (139 boys and 108 girls) aged 7.9-11.1 years. Maximal oxygen uptake was measured by indirect calorimetry during a maximal ergometer exercise test with an initial workload of 30 W and 15 W x min(-1) increments. Maximal power output was also measured. A sample (n = 124) was used to calculate reference equations, which were then validated using another sample (n = 123). The linear reference equation for both sexes combined was: VO(2max) (ml x min(-1)) = 96 + 10.6 x maximal power + 3.5 . body mass. Using this reference equation, estimated VO(2max) per unit of body mass (ml x min(-1) x kg(-1)) calculated from maximal power correlated closely with the direct measurement of VO(2max) (r = 0.91, P <0.001). Bland-Altman analysis gave a mean limits of agreement of 0.2+/-2.9 (ml x min(-1) x kg(-1)) (1 s). Our results suggest that maximal power output serves as a good surrogate measurement for VO(2max) in population studies of children aged 8-11 years.  相似文献   

Teaching Statistics – Despite Its Applications     

Jim Ridgway  James Nicholson  Sean McCusker 《Teaching Statistics》2007,29(2):44-48

Evidence‐based policy requires sophisticated modelling and reasoning about complex social data. The current UK statistics curricula do not equip tomorrow's citizens to understand such reasoning. We advocate radical curriculum reform, designed to require students to reason from complex data.  相似文献   

Maturity-associated variation in sport-specific skills of youth soccer players aged 13-15 years   总被引：1，自引：1，他引：0  

Malina RM  Cumming SP  Kontos AP  Eisenmann JC  Ribeiro B  Aroso J 《Journal of sports sciences》2005,23(5):515-522

The aim of this study was to estimate the contribution of experience, body size and maturity status to variation in sport-specific skills of adolescent soccer players. The participants were 69 players aged 13.2-15.1 years from three clubs that competed in the highest division for their age group. Height and body mass were measured and stage of pubic hair development was assessed at clinical examination. Years of experience in football was obtained at interview. Six football skill tests were administered: ball control with the body, ball control with the head, dribbling with a pass, dribbling speed, shooting accuracy and passing accuracy. Multiple linear regression analysis was used to estimate the relative contributions of age, stage of sexual maturity, height, body mass and years of formal training in soccer to the six skill tests. Age, experience, body size and stage of puberty contributed significantly but in different combinations to the variance in four of the six skill tests: dribbling with a pass (21%; age, stage of maturity), ball control with the head (14%; stage of maturity, height, body height x body mass interaction), ball control with the body (13%; stage of maturity, years of training) and shooting accuracy (8%; stage of maturity, height; borderline significance, P = 0.06). There were no significant predictors for the tests of dribbling speed and passing accuracy. In conclusion, age, experience, body size and stage of puberty contributed relatively little to variation in performance in four of the six soccer-specific skill tests in adolescent footballers aged 13-15 years.  相似文献   

Theory in sport tourism: some critical reflections     

Sean Gammon  Gregory Ramshaw  Richard Wright 《Journal of Sport Tourism》2017,21(2):69-74

  相似文献   

Kinematic analyses of seated throwing activities with and without an assistive pole     

Brendan Burkett  Mark Connick  Mark Sayers  Luke Hogarth  Tom Stevens  Mike Hurkx  Sean Tweedy 《Sports Engineering》2017,20(2):163-170

In Paralympic seated throwing events, the athlete can throw with and without an assistive pole. This study aimed to identify and compare performance-related kinematic variables associated with both seated throwing techniques. Twenty-nine non-disabled males (21.9 ± 2.6 years) performed 12 maximal throws using a 1-kg ball in two conditions (no-pole and pole). Automatic 3D-kinematic tracking (150 Hz) and temporal data were acquired. There was no significant difference between ball speeds at the point of release between conditions (no-pole = 12.8 ± 1.6 m/s vs. pole = 12.9 ± 1.5 m/s). There were four kinematic variables that were strongly correlated with ball speed when throwing with or without an assistive pole. These variables were elbow flexion at the start phase (pole r = .39 and no-pole r = .41), maximum shoulder external rotation angular velocity during the arm cocking phase (pole r = .42), maximum shoulder internal rotation angular velocity during the arm acceleration phase (pole r = .47), and should internal rotation angular velocity at the instant of ball release (pole r = .40). The pole clearly influenced the throwing technique with all four strongly correlated variables identified in this condition, compared to only one during the no-pole condition. When using the pole, participants produced significantly higher shoulder internal rotation angular velocities during the arm acceleration phase (pole = 367 ± 183°/s vs. no-pole = 275 ± 178°/s, p < .05) and at the instant of ball release (pole = 355 ± 115°/s vs. no-pole = 264 ± 120°/s, p < .05), compared to throwing without the pole. These findings have implications for the development of evidence-based classification systems in Paralympic seated throwing, and facilitate research that investigates the impact of impairment on seated throwing performance.  相似文献   

The politicisation of sport in modern China: Communists and champions     

Sean Huddleston 《Sport in History》2017,37(4):535-537

  相似文献   

Philosophy in Schools: A Catholic School Perspective          下载免费PDF全文

Sean Whittle 《Journal of Philosophy of Education》2015,49(4):590-606

This article builds on the recent Special Interest issue of this journal on ‘Philosophy for Children in Transition’ (2011) and the way that the debate about philosophy in schools has now shifted to whether or not it ought to be a compulsory part of the curriculum. This article puts the spotlight on Catholic schools in order to present a different argument in favour of introducing compulsory philosophy lessons into the curriculum. It is explained that in faith schools, such as Catholic ones, there is an additional need or imperative to have compulsory philosophy as part of the curriculum. This is because it serves as an effective way of avoiding the inherent dangers of confessional education, particularly the indoctrination challenge. It is argued that Catholic schools also have some intriguing theological reasons that can be used to justify the inclusion of compulsory philosophy in the school curriculum. It is proposed that when it comes to philosophy in schools there is a distinctive Catholic school perspective. As part of this it is explained why Catholic schools, perhaps more than others, need philosophy to be a compulsory part of the curriculum.  相似文献