现代炼钛金术     

StevenAshley崔琳琳  杨光 《科学中国》2003,(12):18-19

踏破铁鞋无觅处，得来全不费工夫。发现之神将高科技材料的低成本生产工艺传授给我们。  相似文献   

An investigation into teaching games for understanding: effects on skill, knowledge, and game play.     

A P Turner  T J Martinek 《Research quarterly for exercise and sport》1999,70(3):286-296

The purpose of this study was to test the validity of the games for understanding model by comparing it to a technique approach to instruction and a control group. The technique method focused primarily on skill instruction where the skill taught initially was incorporated into a game at the end of each lesson. The games for understanding approach emphasized developing tactical awareness and decision making in small game situations. Two physical education specialists taught field hockey using these approaches for 15 lessons (45 min each). The control group did not receive any field hockey instruction. Data were collected from 71 middle school children. Pretests and posttests were administered for hockey knowledge, skill, and game performance. Separate analyses of variance or analyses of covariance were conducted to examine group differences for cognitive and skill outcomes. The games for understanding group scored significantly higher on passing decision making than the technique and control groups during posttest game play and significantly higher than the control group for declarative and procedural knowledge. The games for understanding group scored significantly higher on control and passing execution than the other groups during posttest game play. For hockey skill, there were no significant differences among the treatment groups for accuracy, but the technique group recorded faster times than the control group on the posttest.  相似文献   

Debating Education: Is There a Role for Markets?     

Ashley Berner 《Educational theory》2020,70(1):105-112

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The effects of professional development on science teaching practices and classroom culture     

Jonathan A. Supovitz  Herbert M. Turner 《科学教学研究杂志》2000,37(9):963-980

The current science education reform movement emphasizes the importance of professional development as a means of improving student science achievement. Reformers have developed a vision for professional development based upon intensive and sustained training around concrete tasks that is focused on subject‐matter knowledge, connected to specific standards for student performance, and embedded in a systemic context. Using data from a National Science Foundation Teacher Enhancement program called the Local Systemic Change initiative, this study employs hierarchical linear modeling to examine the relationship between professional development and the reformers' vision of teaching practice. The findings indicate that the quantity of professional development in which teachers participate is strongly linked with both inquiry‐based teaching practice and investigative classroom culture. At the individual level, teachers' content preparation also has a powerful influence on teaching practice and classroom culture. At the school level, school socioeconomic status was found to influence practice more substantially than either principal supportiveness or available resources. © 2000 John Wiley & Sons, Inc. J Res Sci Teach 37: 963–980, 2000  相似文献   

Culture wars in the classroom: Prospective teachers question science     

Karen Sullenger  Steve Turner  Hart Caplan  Joe Crummey  Rick Cuming  Cynthia Charron  Beth Corey 《科学教学研究杂志》2000,37(9):895-915

Does studying about the nature(s) of science contribute to a prospective teachers' effectiveness as a science teacher? This research grew out of a course created by a science educator and historian of science who believed prospective teachers needed more complex understandings of the cultural wars surrounding science. The research team consisted of five prospective teachers who participated in the course as well as the two instructors. This paper describes the experience of participating in the course from both perspectives. We argue that studying the cultural wars over science contributes to prospective teachers' professional growth as much because the course elicits tacit beliefs about school science as it introduces more complex understandings of science. We found that prospective teachers' tacit beliefs about school science were their greatest barrier to developing more complex understandings about the nature(s) of science. We contend that willingness to grapple with complexity and developing a professional identity by locating oneself in the conversations about the nature(s) of science are better criteria for determining the professional growth of prospective teachers than knowledge measures. Finally, we argue that prospective teachers should be viewed as professionals who are responsible for finding their own voice, making their own decisions, and considering the consequences of their beliefs on their practice. This study raises questions critical to teacher education programs for prospective teachers and teacher‐educators alike. © 2000 John Wiley & Sons, Inc. J Res Sci Teach 37: 895–915, 2000  相似文献   

An evaluation of the special needs referral process for low-income preschool children with emotional and behavioral problems     

John Fantuzzo  Jill Stoltzfus  Megan Noone Lutz  Helen Hamlet  Vijaykumar Balraj  Colleen Turner  Samuel Mosca 《Early childhood research quarterly》1999,14(4):465

The present study is an evaluation of the special needs referral system in a large urban Head Start program. To assess the validity of this system, two assessments were conducted. The first examined a representative sample of 105 children who were formally referred for special needs services. The Early Intervention Screening Profile (EISP) was used to indicate the distribution of problem behaviors of these special needs children. Two independent raters evaluated all cases. Reliable evaluations revealed that all of the referred children displayed speech and language problems, with 70% showing only speech problems and 30% showing speech plus emotional and behavioral problems. The second assessment examined reports of teachers’ concerns about children program-wide by obtaining a representative sample of 203 children nominated by teachers as most likely to be identified as having special needs. Teachers completed a modified EISP. Results indicated that over 70% of the children evidenced emotional and behavioral problems with no accompanying speech difficulties and 30% displayed emotional and behavioral problems plus speech problems. Implications of referral biases were discussed.  相似文献   

Time to confront Willis’s lads with a ballet class? A case study of educational orthodoxy and white working‐class boys     

Martin Ashley 《British Journal of Sociology of Education》2009,30(2):179-191

This is a retrospective study tracing the longer term effects on identity and aspiration of white working‐class boys from an area of high social deprivation. The boys were members of an acclaimed boys’ dance company and have been retrospectively interviewed as young men in their twenties. Documentary and film material dating from the time they were 14 year olds and the film Billy Elliot were used in the interviews. A media discourse driven by a view of boys ‘in crisis’ that is blind to social class and the difficulties faced by some girls was uncovered. This is found to pervade the entire Billy Elliot discourse, which focused on the sensation of a boy performing ballet rather than on the class background and historical context of the miners’ dispute. The paper questions the discourse of laddishness and the social identity that is attached to the term ‘lad’.  相似文献   

Doing an effective job? Measuring the impact of casework     

Susannah Turner  Leisa Randall  Azra Mohammed 《Educational Psychology in Practice》2010,26(4):313-329

This article describes an initiative to evaluate the impact of educational psychologists’ (EPs’) casework. Previous studies have often focussed on evaluating processes or reducing outcomes to measurable units. The authors argue that qualitative research methods can be used to illuminate EP effectiveness. They describe a real world and proportionate methodology, crucially aimed at supporting self‐reflection and development. An evaluation of this initiative showed that it can demonstrate EP impact and has validity for individual and service improvement. Implications, including the need to face up to less than positive feedback, are discussed.  相似文献   

Fifteen pupils’ positive approach to primary school science: when does it decline?     

Sarah Turner  Gren Ireson 《Educational studies》2010,36(2):119-141

The decline in secondary school pupils’ attitudes towards science is well documented. However, recent research has shown that pupils’ attitudes to science appear to become fixed during their primary school years. This study investigated end of Key Stage 1 (Yr 2 (ages six to seven years)) and end of Key Stage 2 (Yr 6 (ages 10–11 years)) pupils’ attitudes to science, using Klopfer’s themes (1971 Klopfer, L.E. 1971. “Evaluation of learning in science”. In Handbook on summative and formative evaluation of student learning, Edited by: Bloom, B.S., Hastings, J.T. and Madaus, G.F. 559–641. New York: McGraw‐Hill.  [Google Scholar]), through a paired activity and interview for Yr 2 pupils and a pre‐ and post‐Test of Science‐Related Attitudes questionnaire (adapted) for Yr 6 pupils. The questionnaire was analysed using the mean and chi square values and Cronbach’s alpha was calculated to test reliability. The results revealed that while Yr 2 pupils exhibit a thirst for knowledge and enthusiasm for science, Yr 6 pupils’ attitudes over the period of one academic year did not change: their attitude towards science was fixed. This insight raises some implications and responsibilities for primary school teachers.  相似文献   

Youths in foster care with language delays: Prevalence,causes, and interventions          下载免费PDF全文

Jessie C. Krier  Tonika Duren Green  Ashley Kruger 《Psychology in the schools》2018,55(5):523-538

Children in the foster care system often face many educational challenges, including having an increased risk of language delays compared to the general population, with an estimated 35%–73% of the foster youth population experiencing language difficulties. Language delays are caused by many factors, but for children in foster care, one major antecedent is child abuse and neglect. Early delays greatly impact long‐term outcomes for children, including delays in their reading, writing, and social competence. This article explores possible causes of language delays for youths in foster care, describes the negative impact of language delays, and identifies evidence‐based practices for early intervention within the child welfare system and primary and secondary schools, specifically targeting practices for school psychologists, school counselors, school social workers, and speech pathologists.  相似文献