排序方式: 共有83条查询结果,搜索用时 15 毫秒
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Stuart S. Yeh 《Early childhood research quarterly》2003,18(4):513-529
Several research studies linking early phonemic awareness to the prevention of later reading difficulties strongly suggest that phoneme segmentation and blending, rather than rhyming and alliteration abilities, are the key aspects of phonemic awareness that are related to the prevention of difficulties. Yet there is a persistent belief among many educators that instruction in rhyming and alliteration are adequate to develop phonemic awareness and developmentally more appropriate than segmentation and blending activities. Using quasi-experimental methods, I evaluated two approaches for teaching phonemic awareness to 4- and 5-year-old children in four Head Start classrooms. The first approach focused on rhymes, alliteration, and story activities. The second approach focused on phoneme segmentation and blending in the context of sounding out actual words. Results showed that children taught using the second approach produced significantly greater gains in phonemic awareness and letter–sound knowledge, compared to children using the first approach. Both approaches were more effective when teachers had previously taught attention skills to their children. 相似文献
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The seamless integration of reagents into microfluidic devices can serve to significantly reduce assay complexity and cost for disposable diagnostics. In this work, the integration of multiplexed reagents into thermoplastic 2D microwell arrays is demonstrated using a scalable pin spotting technique. Using a simple and low-cost narrow-bore capillary spotting pin, high resolution deposition of concentrated reagents within the arrays of enclosed nanoliter-scale wells is achieved. The pin spotting method is further employed to encapsulate the deposited reagents with a chemically modified wax layer that serves to prevent disruption of the dried assay components during sample introduction through a shared microchannel, while also enabling temperature-controlled release after sample filling is complete. This approach supports the arbitrary patterning and release of different reagents within individual wells without crosstalk for multiplexed analyses. The performance of the in-well spotting technique is characterized using on-chip rolling circle amplification to evaluate its potential for nucleic acid-based diagnostics. 相似文献
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This study presents packaged microscale liquid lenses actuated with liquid droplets of 300-700 μm in diameter using the dielectric force manipulation. The liquid microlens demonstrated function focal length tunability in a plastic package. The focal length of the liquid lens with a lens droplet of 500 μm in diameter is shortened from 4.4 to 2.2 mm when voltages applied change from 0 to 79 V(rms). Dynamic responses that are analyzed using 2000 frames∕s high speed motion cameras show that the advancing and receding times are measured to be 90 and 60 ms, respectively. The size effect of dielectric liquid microlens is characterized for a lens droplet of 300-700 μm in diameter in an aspect of focal length. 相似文献
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Previous study has showed superior sensory organisation ability in rhythmic gymnasts, but mostly in longitudinal data. With a cross-sectional design, this study used a dual-task paradigm to examine the above phenomenon. Fifteen female rhythmic gymnasts (15.0 ± 1.8 yr.) and matched peers (15.1 ± 2.1 yr.) were recruited. The Sensory Organization Test (SOT) was administered with a concurrent lower-demand (serial subtraction of three, serving as the baseline) or higher-demand (serial subtraction of seven, serving as the dual-task) arithmetic task. The results showed no main effect of group, but a group by level of arithmetic task (P = 0.001) interaction effect on SOT equilibrium score. The higher-demand task facilitated balance performance in the gymnasts, but it impeded performance in the controls, with the differences more pronounced in challenging SOT conditions. With the higher-demand task, the gymnasts adopted a sensory strategy with a higher visual ratio but a smaller somatosensory ratio compared to the controls. Better visual utilisation of sensory organisation ability was apparent in gymnasts, but only when the SOT test was performed with a higher-demand secondary task. We have demonstrated the efficacy of using the dual-task paradigm to identify the superior sensory organisation ability of adolescent rhythmic gymnasts. 相似文献
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James E. Gall Heng-Yu Ku Keyleigh Gurney Hung-Wei Tseng Hsin-Te Yeh Qin Chen 《Educational technology research and development : ETR & D》2010,58(3):343-351
Scientific communication in the field of educational technology was examined by analyzing references from and citations to
articles published in Educational Technology Research and Development (ETR&D) for the period 1990–2004 with particular emphasis on other journals found in the citation record. Data were collected on
the 369 core articles found in the 60 issues published during that time period, their reference lists (containing over 14,805
individual items), and citations of those articles in other journals (1,896 entries). The top cited and citing journals during
that time period are listed. Nine symbiotic journals (i.e. those that are most cited by ETR&D and frequently cite it) were identified: Contemporary Educational Psychology, Educational Psychologist, Instructional Science, Journal of Computer-Based Instruction (no longer published), Journal of Educational Computing Research, Journal of Educational Psychology, Journal of Educational Research, Journal of Research in Science Teaching, and the Review of Educational Research. The results provide an in-depth, quantitative view of informal connections within the field via the citation record. Implications
for further research and the potential influence of new technologies on scientific communication are also discussed. 相似文献
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This study tested a mediation model between depression and neuroticism on 209 college students. Previous research suggests that students who appraise their lives as having no value or worth, which is known as floccinaucinihilipilification (flocci), may be prone to depressive symptoms because of a neurotic disposition. Results found flocci domains targeted at the self and relationships partially mediated the neuroticism–depression relation. Implications and recommendations for professionals are discussed. 相似文献