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排序方式: 共有467条查询结果,搜索用时 31 毫秒
81.
Mengxing Ouyang Wing Ki Cheung Wenfeng Liang John D. Mai Wing Keung Liu Wen Jung Li 《Biomicrofluidics》2013,7(5)
The phenomenon of self-rotation observed in naturally and artificially pigmented cells under an applied linearly polarized alternating current (non-rotating) electrical field has been investigated. The repeatable and controllable rotation speeds of the cells were quantified and their dependence on dielectrophoretic parameters such as frequency, voltage, and waveform was studied. Moreover, the rotation behavior of the pigmented cells with different melanin content was compared to quantify the correlation between self-rotation and the presence of melanin. Most importantly, macrophages, which did not originally rotate in the applied non-rotating electric field, began to exhibit self-rotation that was very similar to that of the pigmented cells, after ingesting foreign particles (e.g., synthetic melanin or latex beads). We envision the discovery presented in this paper will enable the development of a rapid, non-intrusive, and automated process to obtain the electrical conductivities and permittivities of cellular membrane and cytoplasm in the near future. 相似文献
82.
ABSTRACTThis study examined the effect of wearing time on comfort perception and landing biomechanics of basketball shoes with different midsole hardness. Fifteen basketball players performed drop landing and layup first step while wearing shoes of different wearing time (new, 2-, 4-, 6- and 8-week) and hardness (soft, medium and hard). Two-way ANOVA with repeated measures was performed on GRF, ankle kinematic and comfort perception variables. Increased wearing time was associated with poorer force attenuation and comfort perception during landing activities (p < 0.05). The new shoes had significantly smaller forefoot (2- and 4-week) and rearfoot peak GRF impacts (all time conditions) in drop landing and smaller rearfoot peak GRF impact (6- and 8-week) in layup; shoes with 4-week of wearing time had significantly better perceptions of forefoot cushioning, forefoot stability, rearfoot cushioning, rearfoot stability and overall comfort than the new shoes (p < 0.05). Compared with hard shoes, the soft shoes had better rearfoot cushioning but poorer forefoot cushioning (p < 0.05). Shoe hardness and wearing time would play an influential role in GRF and comfort perception, but not in ankle kinematics. Although shoe cushioning performance would decrease even after a short wearing period, the best comfort perception was found at 4-week wearing time. 相似文献
83.
84.
Winnie Wing Mui So Ying Zhan Stephen Cheuk Fai Chow Chi Fai Leung 《International Journal of Science and Mathematics Education》2018,16(6):1003-1023
This study adopted a researcher-generated framework to analyze STEM activities demonstrated in primary students’ science projects in an annual extracurricular event held in Hong Kong. Ten students’ project reports were randomly selected from each of the three groups of 24 outstanding, 45 merit, and 68 consolation awarded projects. Content analysis was conducted to code the activities in each project. The coded information was then changed into numerical data for quantitative analysis. The results showed that, in general, more engineering and science activities than technology and mathematics activities were adopted by the primary students in their projects. More projects with the Outstanding Award conducted STEM activities than those projects with Merit and Consolation Awards, and significant group differences existed in the science and mathematics activities. Besides, science activities significantly positively related to engineering and mathematics activities. Furthermore, STEM-related content knowledge of discipline core ideas and crosscutting concepts were reported. This study sheds light on the pattern of STEM activities in students’ science projects, and has implications for promoting STEM integration in primary education. 相似文献
85.
Creative literacy activities promote positive reading attitude in children learning English as a foreign language
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Bonnie Wing‐Yin Chow Anna Na Na Hui Barbie Hiu‐Tung Chui 《Journal of Research in Reading》2018,41(2):278-289
This study investigated the effects of creative literacy classroom activities on the acquisition of English as a foreign language. Ninety Chinese second graders were tested on reading attitude and English receptive vocabulary knowledge. They were randomly assigned to either a control group or an experimental group, which engaged in English creative classroom activities for 10 weeks. Repeated measures analyses showed a significant interaction effect for reading attitude, providing empirical evidence that English creative classroom activities can enhance reading attitude. This study extends past research by demonstrating the links between creative activities and reading attitude, as well as highlights the feasibility of incorporating creative literacy activities within foreign language education. This provides a new direction for researchers and educators to develop instructional practices that incorporate a stimulating environment for English‐as‐a‐foreign‐language students. Future longitudinal research could examine whether these benefits can be maintained over a longer period. 相似文献
86.
Po Yuk Ko 《Educational Action Research》2019,27(4):543-563
ABSTRACTLesson Study and Learning Study are popular teacher professional development models across the world. Drawing on an extensive review of research and literature, this paper aims to identify the features of the two models to contrast and establish their similarities and differences particularly with regard to their application in practice. The paper focuses on their impact on teaching and learning as well as the rationale behind the process of Lesson Study and Learning Study. Four major distinctions between the two models are revealed: ways of identifying a topic for teaching, views and methods for understanding student learning, the focus of teacher collaboration on lesson design and implementation, and the overall instructional design. The paper concludes that the two models appeal to different practitioners depending on their aims and objectives in teaching and learning as well as their broader perspectives on education. In addition, this paper suggests that the two models could complement each other to improve the effectiveness of teaching and learning in different contexts. 相似文献
87.
88.
Christopher F. Lucey Sarah K. Y. Lam 《International journal for the advancement of counseling》2012,34(2):107-117
This study was designed to identify characteristics of family functioning that relate to suicide potential in an outpatient
adolescent population. Participants included 51 adolescents between the ages of 14 and 18 who were involved in outpatient
counselling. The Family Environment Scale and the Suicide Probability Scale were used to assess adolescents’ perception of
family social climate and degree of suicide risk respectively. Results revealed significant correlations between suicide risk
and family systems characterized by heightened conflict and lower levels of cohesion, independence, and organization. A stepwise
multiple regression analysis suggested that organization (related to clarity and structure in family activities and responsibilities)
was the strongest predictor of suicide risk. Implications for research and practice are considered. 相似文献
89.
格坡铁支 《佳木斯教育学院学报》2012,(4):72-73
保护、传承和发展少数民族节庆是民族地区发展旅游业的前提,发展旅游业对保护、传承和发展民族节庆有巨大的作用。非物质文化遗产,是以无形方式世代流传于人类社会的传统文化表现形式。凉山彝族国际火把节,作为我国首批非物质文化遗产,其开发极大的促进凉山州经济的发展。本文通过分析火把节的开发对凉山州旅游业的促进作用,以及凉山旅游的发展反过来对火把节的保护作用,探讨如何实现将两者协调发展。 相似文献
90.
Carmel McNaught Paul Lam Kin Fai Cheng 《Educational technology research and development : ETR & D》2012,60(2):271-286
This article reports a study of eLearning in 21 courses in Hong Kong universities that had a blended design of face-to-face
classes combined with online learning. The main focus of the study was to examine possible relationships between features
of online learning designs and student learning outcomes. Data-collection strategies included expert reviews of the learning
designs, student surveys of perceptions of the web environment and their own learning outcomes, and a SOLO (structure of observed
learning outcomes) analysis of assessment evidence of student learning outcomes. The findings of this correlational study
indicate mild relationships between features of learning design and student perceptions of their learning outcomes. Both the
provision of learning resources and the engagement of students in online communication relate to aspects of learning (acquisition
of knowledge and skills, and enhancement of learning motivation). Also, the relationship was stronger when eLearning strategies
were more extensively used. However, no relationship was found between learning design and the student performance in assessment
tasks, possibly because of the limited assessment data that was examined. 相似文献