排序方式： 共有24条查询结果，搜索用时 0 毫秒
21.
DEHGHANI Mohammad Hadi MAHVI Amir Hossein NAJAFPOOR Ali Asghar AZAM Kamal 《浙江大学学报(A卷英文版)》2007,8(9):1462-1468
The effectiveness of using acoustical (sonochemical) reactor for degradation of linear alkylbenzen sulfonate (LAS) from aqueous solution was investigated. LASs are anionic surfactants,found in relatively high amounts in domestic and industrial wastewaters. In this study,experiments on LAS solution were performed using methylene blue active substances (MBAS) method. The effectiveness of acoustical processor reactor for LAS degradation is evaluated with emphasis on the effect of treatment time and initial LAS concentration. Experiments were performed at initial concentrations of 0.2,0.5,0.8 and 1.0 mg/L,acoustic fre-quency of 130 kHz,applied power of 500 W and temperature of 18 °C～20 °C. At the conditions involved,LAS degradation was found to increase with increasing sonochemical time. In addition,as the concentration increased,the LAS degradation rate de-creased in the acoustical processor reactor. 相似文献
22.
The present study examined the language and literacy skills and their relations to each other in multilingual children, who have a broad range of oral and written language proficiency in each language that they “know”. Reading and vocabulary skills were tested in 50 Canadian children (ages 6–10 years) who were Urdu–English speakers, learning Arabic. Reading skills were related to within-language oral proficiency and across languages with similar and different orthographies. The results suggest the need for hybrid models of language acquisition that combine language-general and language-specific components. The results also are discussed in terms of the need to consider the language and literacy skills of multilingual individuals in current theories of language and literacy acquisition. 相似文献
23.
This empirical study investigates secondary science teachers’ perspectives on science education reform in Taiwan and reflects how these teachers have been negotiating constructivist and learner-centered pedagogical approaches in contemporary science education. It also explores the challenges that teachers encounter while shifting their pedagogical focus from traditional approaches to teaching science to an active engagement in students’ learning. Multiple sources of qualitative data were obtained, including individual interviews with science teachers and teachers’ reflective journals about Confucianism in relation to their educational philosophies. Thematic analysis and constant comparative method were used to analyze the data. The findings revealed that Confucian traditions play a significant role in shaping educational practices in Taiwan and profoundly influence teachers’ epistemological beliefs and their actual classroom practice. Indeed, science teachers’ perspectives on Confucian learning traditions played a key role in supporting or obstructing their pedagogical commitments to inquiry-based and learner-centered approaches. This study draws on the literature concerning teachers’ professional struggles and identity construction during educational reform. Specifically, we explore the ways in which teachers respond to educational changes and negotiate their professional identities. We employed various theories of identity construction to understand teachers’ struggles and challenges while wrestling with competing traditional and reform-based pedagogical approaches. Attending to these struggles and the ways in which they inform the development of a teacher’s professional identity is vital for sustaining current and future educational reform in Taiwan as well as in other Eastern cultures. These findings have important implications for teachers’ professional development programs in East Asian cultures. 相似文献
24.
Huang Ying-Syuan Asghar Anila Nichols Naomi E. 《Educational Research for Policy and Practice》2021,20(2):187-205
Educational Research for Policy and Practice - This policy ethnography focuses on a nationwide environmental and sustainability education policy that was developed and enacted in response to United... 相似文献