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991.
Zijun He Zheng Qi Huichao Liu Kangyan Wang Leslie Roberts Jefferson Z Liu Yilun Liu Stephen J Wang Mark J Cook George P Simon Ling Qiu Dan Li 《国家科学评论(英文版)》2022,9(4)
Human bodily movements are primarily controlled by the contractions of skeletal muscles. Unlike joint or skeletal movements that are generally performed in the large displacement range, the contractions of the skeletal muscles that underpin these movements are subtle in intensity yet high in frequency. This subtlety of movement makes it a formidable challenge to develop wearable and durable soft materials to electrically monitor such motions with high fidelity for the purpose of, for example, muscle/neuromuscular disease diagnosis. Here we report that an intrinsically fragile ultralow-density graphene-based cellular monolith sandwiched between silicone rubbers can exhibit a highly effective stress and strain transfer mechanism at its interface with the rubber, with a remarkable improvement in stretchability (>100%). In particular, this hybrid also exhibits a highly sensitive, broadband-frequency electrical response (up to 180 Hz) for a wide range of strains. By correlating the mechanical signal of muscle movements obtained from this hybrid material with electromyography, we demonstrate that the strain sensor based on this hybrid material may provide a new, soft and wearable mechanomyography approach for real-time monitoring of complex neuromuscular–skeletal interactions in a broad range of healthcare and human–machine interface applications. This work also provides a new architecture-enabled functional soft material platform for wearable electronics. 相似文献
992.
A peer tutoring program in spelling was developed to investigate the effects of several tutor and tutee characteristics on tutorial outcomes, amount of learning and learning efficiency. Examination of the data reveals that only the tutee's pretutorial spelling score was a significant predictor of the amount of learning. 相似文献
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994.
Stephen Sulzbacher 《Performance Improvement》1967,6(2):10-11
60 Ss took a program in one of three ways: writing the answer, “thinking” the answer without writing it, or reading a program with the answers filled in. Results indicated no significant differences among the groups on two measures of amount learned. Low positive correlations were obtained between amount learned and IQ and reading comprehension of the Ss. Percent error on test frames within the program was negatively correlated with adjusted gain scores (r = −0.71). Results were also related to possible pragmatic applications. 相似文献
995.
Stephen Turner 《Metascience》2015,24(3):463-465
996.
Stephen P. Norris 《Educational Measurement》1988,7(3):5-11
This paper describes briefly a methodology for developing multiple-choice critical thinking tests which attempts to overcome certain problems of validity and fairness facing such tests. The paper proposes that direct evidence on test validity be gathered using verbal reports of students' thinking on trial items. 相似文献
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1000.
Query Expansion with Long-Span Collocates 总被引:1,自引:0,他引:1
The paper presents two novel approaches to query expansion with long-span collocates—words, significantly co-occurring in topic-size windows with query terms. In the first approach—global collocation analysis—collocates of query terms are extracted from the entire collection, in the second—local collocation analysis—from a subset of retrieved documents. The significance of association between collocates was estimated using modified Mutual Information and Z score. The techniques were tested using the Okapi IR system. The effect of different parameters on performance was evaluated: window size, number of expansion terms, measures of collocation significance and types of expansion terms. We present performance results of these techniques and provide comparison with related approaches. 相似文献