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Frank L. Riggs 《广播与电子媒介杂志》2013,57(4):331-339
Following World War II, an agile broken‐field runner rather than a sedentary historian would be needed to follow the myriad twists, turnings, and changes in radio programming, audiences, and effects in the United States. Now that a certain stability and growth pattern is (hopefully) again dominant, perhaps it is time for those of us who have lived through this period to attempt a rearward look. Frank Riggs, who holds degrees from the University of Arizona and George Washington University, recently completed a tour of duty as Radio‐Television Officer for the Air Force Systems Command, with the responsiility for producing numerous radio documentary and series programs. 相似文献
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A meta-analysis was conducted on the observational modelling literature (n = 55 studies) to quantify overall between-participant treatment effects (deltau Bi) gained for child and adult populations. The overall observational modelling treatment estimate obtained from movement dynamics (i.e. form) data was larger for adults (deltau Bi = 0.80) than children (deltau Bi = 0.24); the modelling advantage over a practice-only control condition was significant for adults only. In contrast, the overall observational modelling treatment estimate obtained for movement outcome data (i.e. task goal) was negligible (deltau Bi = -0.02) for adults, whereas it was more substantial (deltau Bi = 0.48) and significant for children. These findings are consistent with the suggestion that, as a result of observation, children show a greater tendency to achieve movement outcome goals (e.g. task accuracy) than adults, who tend to focus more on matching existing intrinsic dynamics with the observed task dynamics. We suggest that the developmental effects influencing observational modelling result from differences in individuals' intrinsic dynamics, and hence the opportunity to replicate the observed motor skill. The current meta-analysis describes reasons for equivocality in the extant observational modelling literature and elucidates a research agenda for pedagogists aiming to better understand the benefits of modelling techniques. 相似文献
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Frank R. Trombley 《Al-Masaq: Islam & the Medieval Mediterranean》2004,16(1):147-161
This article deals with the Islamic background of the Arab penetration of Byzantine Anatolia in the seventh to tenth centuries A.D. It focuses in particular on the implicit references to the Islamic law of war (fiqh al‐jihād), as found in the Arabic historical sources dealing with Muslim raids, the accumulation and distribution of booty, and the ideological framework in which these events occurred. There was a theological dimension to this discourse: Muslim writers at times refer to the absolute determination of the outcome of battles and sieges through divine will. It appears that fiqh al‐jihād had acquired standing as a species of international law by the end of this period, becoming the dialectical cognate of customary law of nations recognised by the late Roman jurists. This becomes evident through an analysis of negotiations for the surrender of cities, and in the periodic exchange of captives for which there are detailed records between 830–946 A.D. Recognised norms were sometimes violated: one sees this particularly in the killing of monks during Arab military operations. It is anticipated that the present study will be the first step in a comparative study of Byzantine and Islamic jurisprudence on the regulation of armed conflict. 相似文献
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Validity issues in higher education selection: A Swedish example 总被引:1,自引:0,他引:1
Simon Wolming 《Studies in Educational Evaluation》1999,25(4):223
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