Kinanthropometry - the interdisciplinary discipline     

Stewart A 《Journal of sports sciences》2007,25(4):373

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The control of current across a spark gap by means of an external magnetic field     

Robt F. Earhart  Henry Arthur Carlock 《Journal of The Franklin Institute》1933,215(2):179-187

An experimental study was made of the electrical discharge between parallel plates when the pressure between the plates had been reduced to a value slightly less than the critical pressure—i.e. to the condition when a tube begins to harden. Under these conditions the application of a transverse magnetic field will produce a discharge between the electrodes for potentials less than the normal potential required. It is believed that this is due to the lengthening of the path traversed by the ions in crossing the gap. The results obtained may be harmonized by means of the values found by Carr (Proc. Roy. Soc. 1903) who made a study of Paschen's Law in the region of critical pressure. In general it is found possible, under the conditions studied, to start a discharge and control the value of the current through a circuit of which the gap is a part by means of varying the magnetic field superposed on the gap and without altering either the impressed E.M.F. or the ohmic resistance of the circuit.This control is effected by altering the effective length of the spark gap in the circuit by means of the external magnetic field.  相似文献   

Comparison of oils derived from coal and from oil shale     

Joseph W. Horne  Arthur D. Bauer 《Journal of The Franklin Institute》1927,204(6):821-822

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Book reviews     

Louis Legrand  Jacques Hallak  Arthur Gillette 《Prospects》1980,10(3):355-366

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A VSE equation of state for liquids—II: n-Alkanes,Benzene, Mercury and Water     

Arthur K. Doolittle 《Journal of The Franklin Institute》1976,301(3):241-251

The work reported in Ref. (1), carried out on n-heptane from 273·16K to the critical point (under moderate pressures), is extended to five n-alkanes, benzene, mercury and water under saturation pressures and extended to much lower temperatures.Forty calculations of various thermodynamic quantities pertaining to the liquids here studied (648 points) are presented in Tables II-IV. All parameters and physical constants involved are presented in Table V. The Standard Percentage Errors (SPE) for all the calculations and the temperature ranges are given in Table VI. The grand average SPE for the 648 points is about one-third of 1%. Only one calculation (the temperature of water from 393·16 to 563·16 K) had an error greater than 1% (18 points).  相似文献   

Book reviews     

Patti McGill Peterson  Maureen Woodhall  David Moore  Edgar Z. Friedenberg  Alan Gordon  Arthur Levine  Dennis Fox  Samuel E. Kellams  Robert T. Blackburn  Hans Draheim  Alec Ross 《Higher Education》1978,7(2):247-260

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Book reviews     

H. D. Law  Burton R. Clark  Roy Niblett  Arthur T. Porter  John Brennan 《Higher Education》1974,3(3):365-376

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Combined training,FNDC5/irisin levels and metabolic markers in obese men: A randomised controlled trial     

Ivan Luiz Padilha Bonfante  Mara Patrícia Traina Chacon-Mikahil  Diego Trevisan Brunelli  Arthur Fernandes Gáspari  Renata Garbellini Duft  Wendell Arhur Lopes 《European Journal of Sport Science》2017,17(5):629-637

The effects of training on FNDC5/irisin and its association with fitness and metabolic marker improvements induced by training have been poorly investigated in humans. Thus, the present study assessed the effects of combined training (CT) on FNDC5/irisin levels, metabolic markers and fitness adaptations in obese men. Middle-age obese men (age 49.13?±?5.75, body mass index (BMI) 30.86?±?1.63) were randomly distributed in the CT group (n?=?12) and control group (CG n?=?10). The CT consisted of strength followed by aerobic training, 3 times/week, for 24 weeks. Body composition, physical fitness, plasma FNDC5/irisin, biochemical markers and metabolic scores/index were evaluated. CT maintained FNDC5/irisin levels (µg/mL) (pre: 4.15?±?0.32, post: 4.21?±?0.32; p?=?.96) and improved body composition, metabolic and physical fitness markers. In the CG, decreased FNDC5/irisin (µg/mL) (pre: 4.36?±?0.23, post: 3.57?±?0.94; p?=?.01) and reduced strength (supine exercise/kg) (pre: 71?±?14.7, post: 60.1?±?14.05; p?<?.01) were observed, along with a trend to increase HOMA-IR (pre: 2.63?±?1.11, post: 3.14?±?1.27; p?=?.07) and other indicators of metabolic deterioration. An inverse correlation was found between the change (Δ%) in levels of FNDC5/irisin and Δ% glucose, Δ% total cholesterol, Δ% triglycerides and Δ% waist circumference, in addition to a positive relation with Δ% muscle strength. In conclusion, CT maintained FNDC5/irisin levels and provided metabolic and fitness benefits. The correlation between FNDC5/irisin changes and metabolic parameters, as well as the FNDC5/irisin reduction associated with fitness and metabolic worsening in the CG, suggests a relationship between FNDC5/irisin and a healthy metabolic status in humans.  相似文献   

Segmented sedentary time and physical activity patterns throughout the week from wrist-worn ActiGraph GT3X+ accelerometers among children 7-12 years old     

Gillian McLellan  Rosie Arthur  Samantha Donnelly  Duncan S.Buchan 《运动与健康科学(英文)》2020,9(2):179-188

Background:This study examined the volume and patterns of physical activity(PA) and sedentary time(ST) across different segments of the week among boys and girls.Methods:A total of 188 children aged 7-12 years wore a wrist-mounted ActiGraph GT3 X+accelerometer for 7 days.Time spent in PA and ST was calculated using ActiLife software.The mean number of minutes of light PA,moderate PA,vigorous PA,moderate-to-vigorous PA(MVPA),and ST were calculated per weekday(before school,during school,and after school) and per weekend day(morning and afternoon-evening).Results:After school represented the greatest accumulation of ST compared with before school and during school segments.Boys engaged in225.4 min/day of ST(95% confidence interval(CI):216-235),and girls engaged in 222.2 min/day of ST(95%CI:213-231).During school,boys engaged in significantly more MVPA than girls(46.1 min/day(95%CI:44-48) vs.40.7 min/day(95%CI:39-43)).Across the whole weekday,boys participated in significantly more MVPA than girls(103.9 min/day(95%CI:99-109) vs.95.7 min/day(95%CI:90-101)).The weekend afternoon—evening segment represented the larger accumulation of ST,where boys were significantly more sedentary than girls(367.5 min/day(95%CI:353-382) vs.339.8 min/day(95%CI:325-355),respectively).Conclusion:Our findings suggest that children are highly sedentary and spend little of their time in school in MVPA,especially girls.Routine breaks in school elicit increases in light PA and MVPA.Future work should consider the use of more active breaks within school time to encourage PA and reduce ST.  相似文献   

Communication Intervention for Students with Severe Disability: results of a partner training program     

Michael Arthur  Nancy Butterfield  David H. McKinnon 《International Journal of Disability, Development & Education》1998,45(1):97-115

This paper reports on the evaluation of a professional development program designed for communication partners of students with severe disability. The program aimed to facilitate the translation of reported best practice in the area of communication to classroom practice. A model of case application was used to enhance partner acquisition of targeted skills and knowledge, thereby addressing perceived concerns in this area. Participants including teachers, teacher aides, and speech pathologists completed pre‐ and post‐intervention questionnaires measuring skills, knowledge, and concerns. Data were analysed on the basis of participant role to determine the significance of change between groups. Results suggest that the professional development program was effective. Teachers and teacher aides reported increased skills and knowledge, accompanied by reduced concerns. Speech pathologists indicated minimal change in either area. These findings are explored in the context of the current research literature on partner training in communication intervention.  相似文献