A comparison of the activity demands of elite and sub-elite Australian men's basketball competition   总被引：2，自引：2，他引：0  

Scanlan A  Dascombe B  Reaburn P 《Journal of sports sciences》2011,29(11):1153-1160

The purpose of the study was to describe the differences in the activity demands of sub-elite and elite Australian men's basketball competition. Ten elite (age 28.3 ± 4.9 years, mass 97.0 ± 13.9 kg, height 197.4 ± 8.3 cm) and 12 sub-elite (age 26.1 ± 5.3 years, mass 85.9 ± 13.2 kg, height 191.4 ± 7.6 cm) Australian basketball players participated in the study. Player activity was analysed using video-based time-motion analysis across multiple in-season matches. Customized analytical software was used to calculate player activity into frequencies, mean and total durations (s), and mean and total distances (m) for standing/walking, jogging, running, sprinting, low shuffling, high shuffling, and dribbling movements. Only movement frequency was calculated for jumping and upper body activity. Multivariate analysis of variance revealed that elite players performed significantly more total movement changes (P <0.001), and experienced greater activity workloads while jogging (P <0.01) and running (P <0.002). In contrast, sub-elite players performed significantly more standing/walking (P <0.023) and sprinting (P <0.003) activities. These data suggest that elite basketball competition requires a greater intermittent workload and more sustained activity demands, whereas sub-elite competition may involve greater bursts of activity and longer recovery periods. These differences are likely to reflect variations in player skill and fitness, as well as playing structure between playing standards.  相似文献   

Capillary flow in sacrificially etched nanochannels     

Hamblin MN  Hawkins AR  Murray D  Maynes D  Lee ML  Woolley AT  Tolley HD 《Biomicrofluidics》2011,5(2):21103

Planar nanochannels are fabricated using sacrificial etching technology with sacrificial cores consisting of aluminum, chromium, and germanium, with heights ranging from 18 to 98 nm. Transient filling via capillary action is compared against the Washburn equation [E. W. Washburn, Phys. Rev. 17, 273 (1921)], showing experimental filling speeds significantly lower than classical continuum theory predicts. Departure from theory is expressed in terms of a varying dynamic contact angle, reaching values as high as 83° in channels with heights of 18 nm. The dynamic contact angle varies significantly from the macroscopic contact angle and increases with decreasing channel dimensions.  相似文献   

A pictorial view of the physical activity socialization of young adolescents outside of school     

Beets MW  Banda JA  Erwin HE  Beighle A 《Research quarterly for exercise and sport》2011,82(4):769-778

Childhood obesity prevention has fallen short of anticipated impact. Therefore, intervention programs need to be redirected to other potential settings to increase youth physical activity. This qualitative study, using autodriven interview techniques, was conducted to identify out-of-school settings that youth perceive as important for physical activity. Sixty-six children took photographs involving their physical activity involvement. A subsample completed follow-up focus groups. Salient themes included types of physical activities related to free play, fitness, organized sports, and chores. Most photographs included multiple children of similar age and were taken outdoors. Data suggest children associate chores with physical activity and engage in fitness-related activities. In addition, friends and family, the outdoors, and importantly, the home emerged as natural intervention components that may prove useful towards decreasing the physical inactivity and obesity of youth.  相似文献   

Reading with a purpose     

Aaron Wildavsky 《Publishing Research Quarterly》1988,4(1):44-54

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A decade of research with dyslexic college students: A summary of findings     

P. G. Aaron  Scott Phillips 《Annals of dyslexia》1986,36(1):44-66

The major findings of several research projects that investigated dyslexic college students are summarized in this paper. Consistent findings of these investigations led to the following conclusions. 1) Developmental dyslexia is a syndrome made up of the following four symptoms: slow rate of reading, error-prone oral reading, poor written spelling, and grammatically incorrect writing; 2) all these symptoms could be traced to a poor mastery of the grapheme-phoneme relational rules; 3) developmental dyslexia can be found in subjects who appear to have adequate oral language skills; 4) ex-dyslexics who appear to be “poor spellers but good readers” have subtle reading deficits; and 5) the 20 dyslexic subjects investigated appear to constitute a homogeneous group which raises questions regarding dyslexia subtypes.  相似文献   

Munchausen by proxy: a case, chart series, and literature review of older victims     

Awadallah N  Vaughan A  Franco K  Munir F  Sharaby N  Goldfarb J 《Child abuse & neglect》2005,29(8):931-941

The history of an older child victim of Munchausen by proxy (MBP) is described. He was referred for evaluation after repeated sinus surgeries for recurrent sinus infections believed to be related to a falsified history of an immunodeficiency. The perpetrator was the mother of this 14-year-old victim, consistent with the majority of such cases. This case prompted a review of cases of MBP in older children reported in our hospital as well as a literature search for other cases in older children. METHODS: This study was a chart review of children over 6 years of age who had been evaluated by social services at the Children's Hospital at the Cleveland Clinic and reported as cases of Munchausen by proxy to Child Protective Services between January 2001 and June 2003. Also, an OVID, Psychline, and Pubmed literature review of published cases of Munchausen by proxy were identified, and cases occurring in the older child were selected for review. RESULTS: Older children who are the victims of Munchausen by proxy may have an induced illness, but falsified reports of symptoms and medical history to coerce the child to undergo medical procedures may be more common. Collusion of the victim with the perpetrator may also become a factor as the child ages and adopts the deception. Given the complex relationship that exists between the parent and child, it is difficult to predict whether the victim either will assist the caregiver in maintaining the factitious illness or be able to recognize the falsification. CONCLUSIONS: Older children who are the victims of Munchausen by proxy may fear consequences of revealing the factitious illness. Physicians must consider the possibility of this diagnosis whenever there are discrepancies in a child's illness that makes a factitious illness a consideration.  相似文献   

Introduction to the Open File     

Aaron Benavot 《Prospects》2008,38(3):295-304

After briefly describing the emergence and evolution of the global movement toward Education for All (EFA), the Introduction discusses the difficulties of employing target goals to bring about significant policy change and educational transformation. The article then presents a comprehensive overview of the uneven progress towards EFA since 2000, both across regions and within countries, but also across the six goals themselves. The final section outlines the priority steps to be taken by international agencies, national governments, civil society and donors to support EFA in the years to come.

Aaron BenavotEmail:

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Aaron Benavot (United States of America and Israel)   is Professor of Global Education Policy in the Department of Educational Administration and Policy Studies at the University at Albany-State University of New York. Previously, he served 4 years as Senior Policy Analyst on the Education for All Global Monitoring Report team at UNESCO headquarters in Paris. Benavot’s comparative research has explored the evolution of basic education—namely, educational expansion and compulsory schooling, the isomorphism of official curricular policies, the diversification of secondary education, school differences in curricular implementation, the changing status of vocational education and the growth of national learning assessments. He has also studied the impact of education on economic development and political democratization. Books he has co-authored or edited include: School knowledge for the masses (with J. Meyer and D. Kamens), Law and the shaping of public education (with D. Tyack and T. James), Global educational expansion: Historical legacies and political obstacles (with J. Resnik and J. Corrales) and School knowledge in comparative and historical perspective (with C. Braslavsky).  相似文献   

The return of the grand metanarratives of progress     

Raymond Aaron Younis  Damien Broderick  Kim Humphery 《Metascience》1997,6(1):49-62

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Thin film electro-osmotic pumps for biomicrofluidic applications     

John M. Edwards  IV  Mark N. Hamblin  Hernan V. Fuentes  Bridget A. Peeni  Milton L. Lee  Adam T. Woolley    Aaron R. Hawkins 《Biomicrofluidics》2007,1(1)

Electro-osmotic flow (EOF) pumps are attractive for fluid manipulation in microfluidic channels. Open channel EOF pumps can produce high pressures and flow rates, and are relatively easy to fabricate on-chip or integrate with other microfluidic or electrical components. An EOF pump design that is conducive to on-chip fabrication consists of multiple small channel arms feeding into a larger flow channel. We have fabricated this type of pump design using a thin film deposition process that avoids wafer bonding. We have evaluated pumps fabricated on both silicon and glass substrates. Consistent flow rate versus electric field were obtained. For the range of 40–400 V, flow rates of 0.19–2.30 μL∕min were measured. Theoretical calculations of pump efficiency were made, as well as calculations of the mechanical power generated by various pump shapes, to investigate design parameters that should improve future pumps.  相似文献   

Casual Games and Casual Learning About Human Biological Systems     

C. Aaron Price  Katherine Gean  Claire G. Christensen  Elham Beheshti  Bryn Pernot  Gloria Segovia  Halcyon Person  Steven Beasley  Patricia Ward 《Journal of Science Education and Technology》2016,25(1):111-126

Casual games are everywhere. People play them throughout life to pass the time, to engage in social interactions, and to learn. However, their simplicity and use in distraction-heavy environments can attenuate their potential for learning. This experimental study explored the effects playing an online, casual game has on awareness of human biological systems. Two hundred and forty-two children were given pretests at a Museum and posttests at home after playing either a treatment or control game. Also, 41 children were interviewed to explore deeper meanings behind the test results. Results show modest improvement in scientific attitudes, ability to identify human biological systems and in the children’s ability to describe how those systems work together in real-world scenarios. Interviews reveal that children drew upon their prior school learning as they played the game. Also, on the surface they perceived the game as mainly entertainment but were easily able to discern learning outcomes when prompted. Implications for the design of casual games and how they can be used to enhance transfer of knowledge from the classroom to everyday life are discussed.  相似文献