Technique and timing in women's inward two and one half somersault tuck (405C) and the men's inward two and one half somersault pike (405B) 3 m springboard dives     

Sanders R  Burnett A 《Sports biomechanics / International Society of Biomechanics in Sports》2003,2(2):251-265

The purpose of this study was to compare the inward two and one half somersault dive in a tuck position (405C) performed by females (n = 22) and the inward two and one half somersault dive in a pike position (405B) performed by males (n = 24) to determine changes required by females to successfully perform 405B. Key performance variables in inward dives were also compared to those of backward dives. Video data of the dives performed at the 1999 FINA World Diving Cup were captured and digitized to obtain times and postures of the divers at specific events including takeoff and entry. Estimates of flight height and mass-normalised work done on the springboard were obtained from flight times. Some females worked the springboard strongly enough to generate sufficient height and rotation to perform 405B. Males performed 405B comfortably because they achieved better height and rotation than the females. A comparison of backward and inward dives revealed that divers are able to attain greater height in backward dives than inward dives.  相似文献   

Rhetoric and the drama     

Ross Scanlan 《Quarterly Journal of Speech》2013,99(4):635-642

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Confining the Poor to Ignorance? Eighteenth‐Century American Experiments with Charity Education     

Sharon Braslaw Sundue 《History of education quarterly》2007,47(2):123-148

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Book Reviews     

Olivia Remie Constable  Eleanor A. Congdon  Andrew J. Lane  Sharon E. J. Gerstel  Ann Chamberlin  G.A. Loud 《Al-Masaq: Islam & the Medieval Mediterranean》2007,19(2):199-215

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Blending authentic work projects and instructional assignments: An adaptation process     

Kathryn R. Ross 《Educational technology research and development : ETR & D》1998,46(3):67-79

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Meditating the lesson     

D.V. Ross 《British Journal of Religious Education》1936,3(2):101-106

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Radiation reaction forces and the expanding universe     

Ross Gunn 《Journal of The Franklin Institute》1935,220(2):167-186

The expanding universe is described in terms of the known forces of classical physics. It is shown that great clouds of stars are non-conservative systems and that radiation reaction forces play a part in guiding stellar motions. The forces are of importance in unsymmetrical stars and evidence is collected to show that perhaps all stars are possessed of deep seated thermal asymmetries. The forces continually act to increase the mean velocity of the stars and the galaxy is calculated to expand at a rate which closely approximates the observed rate of expansion. From a relation connecting the mean velocity of the stars and their age, it is deduced from the observed motions that the age of the galaxy is about 10¹⁰ years. The deduced rate of expansion of the galaxy agrees well with the observational data and is identical in form and numerical constant with Hubble's relation connecting the velocity of recession and distances of nebulæ.Because of the relative size and spacing of the extra galactic nebulæ and the short time scale it is supposed that the nebulae were formed by fission from a parent-super nebula and this resulted in thermal asymmetries which brought the newly considered forces into action.The resulting expansion was produced by slow evolutionary radiation processes which bear no direct relation to the properties of space or atomic constants.The calculations suggest that in describing the motions of typical stars over long periods of time, radiation reaction forces are as important as the classical gravitational forces.  相似文献   

VALUE-FRAMING ABORTION IN THE UNITED STATES: AN APPLICATION OF MEDIA SYSTEM DEPENDENCY THEORY     

Ball-Rokeach  S. J.; Power  Gerard J.; Guthrie  K. Kendall; Waring  H. Ross 《Int. Journal of Public Opinion Research》1990,2(3):249-273

This paper is in the tradition of social analysis aimed at creatingframeworks to join mass media and public opinion processes (e.g.Clarke and Evans, 1983; Gamson, 1975; Gitlin, 1980; Hall, 1977;Iyengar and Kinder, 1987; Lang and Lang, 1968, 1983; Lippman,1922; Mollotch and Lester, 1974; Noelle-Neuman, 1974; Paletzand Entman, 1981; Shaw and McCombs, 1977; Turner and Paz, 1986).After a brief review of media system dependency (MSD) theory,we illustrate how it may apply to public opinion processes thatentail contested issue ‘value-frames’ (Ball-Rokeachand Rokeach, 1987). In such cases, the media system is directlyimplicated in the negotiation of legitimacy of opposing positionson an issue. Our illustrative case is the abortion issue asit has been played out in the United States over recent decades(Luker, 1984). We focus upon the respective capacities of pro-and anti-abortion movements to control the value-frame of mediacoverage of the issue (Guthrie, 1989). A value-frame may beconceived as ‘... the main substantive theme of a moralityplay’ (Ball-Rokeach and Tallman, 1979) wherein the distinctionbetween ‘good’ and ‘bad’ hangs in thebalance; in this case, between positions on abortion. We suggestthat change in the value-frame of media coverage and publicdiscourse may be understood, at least in part, as an outcomeof change in contestants' MSD relations.  相似文献   

Reflections on Sidney Hook     

Robert Hessen  Ernest Benjamin Hook  John H. Bunzel  Ralph G. Ross  Milorad M. Drachkovitch  Yin Lujun 《Academic Questions》1989,3(1):9-23

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Reading and Writing Intervention for Older Students with Disabilities: Possibilities and Challenges     

Carolyn A. Denton  Sharon Vaughn 《Learning disabilities research & practice》2008,23(2):61-62

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