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William David Sloan Phyllis Dain John Y. Cole Christine L. Borgman 《Communication Booknotes Quarterly》2013,44(3)
MAKERS OF THE MEDIA MIND: JOURNALISM EDUCATORS AND THEIR IDEAS edited by William David Sloan (Hillsdale, NJ: Lawrence Erlbaum, 1990—$49.95/27.50, ISBN 0-8058-0698-9 hard, 0-8058-0699-7 paper, 357 pp.) LIBRARIES AND SCHOLARLY COMMUNICATION IN THE UNITED STATES: THE HISTORICAL DIMENSION edited by Phyllis Dain and John Y. Cole (Westport, CT: Greenwood, 1990—$37.95, ISBN 0-313-26807-X, 164 pp.) SCHOLARLY COMMUNICATION AND BIBLIOMETRICS edited by Christine L. Borgman (Newbury Park, CA: Sage, 1990—$38.00, ISBN 0-8039-3879-9, 363 pp.) 相似文献
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CLÁUDIA TARRAGÔ CANDOTTI JERRI RIBEIRO DENISE PASCHOAL SOARES ÁLVARO REISCHAK DE OLIVEIRA JEFFERSON FAGUNDES LOSS ANTÔNIO CARLOS S. GUIMARÃES 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(1):31-43
The effective force applied on the crank, the index of pedalling effectiveness, and the economy of movement at 60, 75, 90, and 105 rev/min cadences were examined in nine cyclists and eight triathletes. Tests were performed on two days. Maximal oxygen uptake was measured and the second ventilatory threshold was estimated on day 1 using a stationary bicycle. On day 2, the four different cadences were tested at about 5% below the second ventilatory threshold. A strain gauge instrumented clip-less pedal mounted on the bicycle enabled us to measure the normal and tangential forces exerted on the pedal, while the pedal and crank angles were monitored with the aid of a video system. Based on this information, the effective force and the index of pedalling effectiveness were calculated. Cyclists produced significantly more effective force and a higher index of pedalling effectiveness at 60 and 75 rev/min and were significantly more economic at all cadences than triathletes. The significant and positive correlation between effective force and economy at all cadences suggests that improvement of the effective force would reflect on economy. 相似文献
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