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Abstract The following paper should be seen as an addition to that provided in the Proceedings of the 7th ICTE.’ For reasons of brevity, it does not deal to any large extent with the background to the project, but details the progress of a study into the effects of introducing laptops into primary (elementary) school. The project has provided every pupil in one class with a laptop computer and has tracked the use being made of it as a curriculum tool for writing. The second phase of the project is under way, with a completion date of April 1991. 相似文献
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Tom Settle 《International Journal of Science Education》2013,35(3):258-264
It is difficult to teach science without implying, in a broad sense, that physicalism is true. This is a problem for teachers, regardless of whether they accept or reject physicalism, as well as for students. Physicalism‐‐it used to be called materialism‐‐is not a single doctrine, but a family of doctrines. Six of these are described and it is argued that they are not logically favoured by science. Since alternative metaphysical schemes exist (e.g. Whitehead's) which are consistent with scientific facts, evidence which supports a scientific theory over rivals, even decisively, does not have the logical power to decide in favour of physicalism. Science teaching's insinuation of physicalism can be avoided by deliberately stressing such uncontroversial features of science as: the unfinished nature of research; the use of idealizations in scientific theories; how all scientific theories at best only approach the truth; and that older theories are now known to be, strictly, false, although they still fit the facts to some degree. 相似文献
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Malachy P McHugh Timothy F Tyler Scott C Greenberg Gilbert W Gleim 《Journal of sports sciences》2002,20(2):83-91
Previous studies analysing electromyograms (EMGs) from indwelling electrodes have indicated that fast-twitch motor units are selectively recruited for low-intensity eccentric contractions. The aim of this study was to compare the frequency content of surface EMGs from quadriceps muscles during eccentric and concentric contractions at various contraction intensities. Electromyograms were recorded from the rectus femoris, vastus lateralis and vastus medialis muscles of 10 men during isokinetic (1.05 rad x s(-1)) eccentric and concentric knee extension contractions at 25%, 50%, 75% and 100% of maximal voluntary contraction (MVC) for each contraction mode. Additionally, isometric contractions (70 degrees) were performed at each intensity. The mean frequency and root mean square (RMS) of the surface EMG were computed. Mean frequency was higher for eccentric than concentric contractions at 25% (P < 0.01), 50% (P < 0.01) and 75% (P < 0.05) but not at 100% MVC. It increased with increasing contraction intensity for isometric (P < 0.001) and concentric (P < 0.01) contractions but not for eccentric contractions (P = 0.27). The EMG amplitude (RMS) increased with increasing contraction intensity similarly in each contraction mode (P < 0.0001). Higher mean frequencies for eccentric than concentric contractions at submaximal contraction intensities is consistent with more fast-twitch motor units being active during eccentric contractions. 相似文献
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This paper describes a small‐scale study of what the authors describe as the ecosystemic approach to changing chronic problem behaviour. The study was undertaken with a group of twelve Leicestershire primary teachers. The technique is briefly described and then teachers' responses to it and its effectiveness are discussed. Four case study examples are presented and finally its potential is considered. Although in this case the work was undertaken with primary teachers, this is an approach which could also be useful at secondary level. 相似文献