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Many scientists and coaches are interested in mechanical power produced during cycling, and use Schoberer Rad Me\technik (SRM)
bicycle power cranks to obtain this data. However, it has been expensive and difficult to calibrate SRM cranks, causing much
of the collected data to be unreliable. We present a static method, derived from first principles, for obtaining a calibration
factor for SRM cranks.
A known mass and lever arm (chainring of a known diameter) are used to apply a known torque load to the instrument in four
positions, and the output frequencies are used to calculate the calibration factor in Hz/Nm. The reproducibility of this method
is ±0.01 Hz/Nm, which is acceptable for the application of the instrument, which is measurement of mechanical power application
by cyclists at the crank.
The method is reliable, inexpensive, and easy to set up, and will allow higher confidence in data collected using SRM power
cranks. We recommend calibration of the power meter once every six months because of the measured drift of the calibration
factor over time. 相似文献
83.
We examined equal opportunity climate (EOC) perceptions of reserve component personnel in the US Army (n = 949). We expected that gender and ethnic group membership would influence perceptions of the equal opportunity climate; and that gender and ethnic group membership would moderate the relationship between equal opportunity climate perceptions and ratings of job satisfaction, organizational commitment and workgroup effectiveness. Consistent with our hypothesis, we found the women and minorities perceptions regarding the equal opportunity climate were less favorable than White men. We also found that both gender and ethnicity moderated the relationship between equal opportunity climate perceptions and job outcomes of these groups. Our findings suggest that different groups are sensitive to particular aspects of EOC (e.g., harassment or discrimination) and that these sensitivities affect job-related outcomes. 相似文献
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The authors report on the discovery of a 19th century document that illustrates an early example of educational measurement. The text, copied from the original in the British Museum, is presented in its entirety in the article. 相似文献
87.
Colin Powell 《海外英语》2004,(12):1
In one of my assignments as a young infantry(步兵)officer,I was sent tothe 48th Infantry near Frankfurt,Germany.In those days our prize weaponwas a huge 280-mm atomic cannon. One day Captain Tom Miller assigned my platoon to guard a 280.Ialerted my men,loaded my.45 caliber(口径)pistol and jumped into my jeep.I 相似文献
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