关于光的干涉与衍射现象的研究

以光学课程教学中反映出来的疑难问题为线索，对兴的干涉和衍射现象作了比较系统的分析，进一步总结出二种现象的联系和区别，以促进概念教学。     

Teaching students with Down syndrome in regular classrooms in Ghana: views of secondary school mathematics teachers

ABSTRACT

The recent development of making secondary school education free in Ghana has raised concerns about the level of preparedness of teachers to teach students with diverse needs in one classroom. Significantly, mathematics is one of the core areas that the Ghanaian government has prioritised, and it has institutionalised mechanisms to encourage participation by many students. Accordingly, this qualitative study aimed to document the level of preparedness of mathematics teachers to support the teaching of students with Down syndrome in secondary school classrooms. Twenty-seven mathematics teachers from 14 schools, made up of 18 males and nine females, took part in the study. We found that participants were in favour of implementation of inclusive education. However, regarding the prospect of teaching students with Down syndrome, most of the participants thought that the regular secondary school classroom is not a suitable environment for these students to access education, especially due to a number of challenges. The need for the government to support schools with appropriate teaching materials and facilities is discussed extensively.     

Relationships between teachers’ perceived leadership style,students’ learning style,and academic achievement: a study on high school students

There is debate about whether the leadership style of the teacher or the learning style of the student affects academic achievement more. A large sample (n = 746) of eighth‐grade students in Istanbul, Turkey, participated in a study where the leadership style of the teacher was assessed in terms of people orientation and task orientation. The learning styles examined were: group, individual, visual, auditory, tactile, and kinesthetic. Multiple discriminant analysis indicated that teacher leadership style was the main factor affecting academic performance. No significant relationship was found between learning style and academic achievement.     

Measuring Science Teachers’ Stress Level Triggered by Multiple Stressful Conditions

The complexity of science teaching requires science teachers to encounter a range of tasks. Some tasks are perceived as stressful while others are not. This study aims to investigate the extent to which different teaching situations lead to different stress levels. It also aims to identify the easiest and most difficult conditions to be regarded as stressful conditions by science teachers. An occupational stress inventory of 25 items developed by Okebukola (1988) validation of the occupational stress inventory for science teachers. Science Teacher, was used to measure the science teachers’ stress level in science teaching. A four point Likert scale ranging from 1 – ‘no stress at all’ to 4 – ‘extreme stress’ was used. Fifty-eight Malaysian secondary science teachers participated in the survey in which six volunteered to participate in the interview study. The data was then analyzed using the Rasch model to measure the level of stress caused by different kinds of stressful conditions. Even though ‘overloaded science syllabus’ was identified to be the basis of multiple stressful conditions, it was, however, difficult for the respondents to regard it as a stressful condition. On the other hand, the respondents found that ‘having to teach difficult science topics’ is easiest to be regarded as a stressful condition. It was shown that even though ‘overloaded science syllabus’ is the starting point for stress caused by multiple conditions, due to the availability of coping strategies which can be employed by the respondents, the stressor is minor in causing stress among teachers. On the other hand, when teachers lack the availability of coping strategies dealing with teaching difficult science topics, they easily feel stressful. One of the main recommendations to overcome stressful conditions is to provide the science teachers ‘topic specific pedagogy’ during in-service training.     

The influence of instruction,prior knowledge,and values on climate change risk perception among undergraduates

We evaluated influences on the climate change risk perceptions of undergraduate students in an introductory Earth Science course. For this sample, domain‐specific content knowledge about climate change was a significant predictor of students' risk perception of climate change while cultural worldviews (individualism, hierarchy) and political orientation were not. These results contrast with previous studies highlighting worldviews as a dominant influence on risk perception. At the beginning of the semester, students' climate change content knowledge was relatively low, with average scores on a 21‐item test less than 50%. Post instruction results indicated that students learned climate change science during the course, and their perceptions of risks associated with climate change increased. Unlike most prior research evaluating links between climate change knowledge and risk perception, our measure of content knowledge was a validated assessment specific to climate change. Use of this specific climate knowledge test may be one reason that we detected a relationship between climate knowledge and risk perception whereas most of the previous research has not. Another—possibly complementary—explanation may be a generational shift between our study sample and prior samples. Undergraduates today, having grown up with more exposure to climate change in schools and the media than previous generations, may be diverging from average adults in that learning climate science appears to also increase their perceptions of the risks climate change poses. Undergraduate courses with embedded climate‐related activities present an opportunity to both increase climate science knowledge and risk perceptions of future decision makers.     

Metacognition research and theory: Analysis and implications for instructional design

Metacognition, a construct with strong empirical and theoretical foundations, is integral to successful learning. Research on metacognition has provided convincing evidence supporting its importance in the instruction and learning processes. In this article, research on several aspects of metacognition are briefly reviewed and analyzed, examples of metacognitive strategies are provided, and implications for instructional design are described.     

簇生葱中总黄酮的提取及其含量测定

以芦丁为对照品，确定了以乙醇为溶剂的簇生葱中总黄酮的最佳提取条件，在此条件下黄酮的得率为3．98％．     

Internet Use and Social Networking Among Middle Aged and Older Adults

In this study, the associations between Internet use and the social networks of adults over 50 years of age were examined. A sample (n = 2284) from the 2004 wave of the Health and Retirement Survey was used. In regression models considering a number of control variables, frequency of contact with friends, frequency of contact with family, and attendance at organizational meetings (not including religious services) were found to have a significant positive association with Internet use for adults over 50. Results add to the body of research that suggests Internet use can strengthen social networks, looking specifically at adults over 50.     

Team-Based Learning: Moderating Effects of Metacognitive Elaborative Rehearsal and Middle School History Content Recall

Promoting Acceleration of Comprehension and Content through Text (PACT) and similar team-based models directly engage and support students in learning situations that require cognitive elaboration as part of the processing of new information. Elaboration is subject to metacognitive control, as well (Karpicke, Journal of Experimental Psychology: General 138(4):469–485, 2009)—successful learners use metacognitive elaborative rehearsal to process and make sense of incoming information even in the absence of structured opportunities or instructional prompts for elaborating. Levels of processing and cognitive load theories suggest that students in PACT classrooms may outperform students in comparison classes because PACT engages and supports deep cognitive processing (via elaboration and discussion) at the time of learning, allowing participants to better conserve and more consistently reallocate cognitive and metacognitive resources (compared to students in the non-treated group) for encoding content. In other words, PACT may moderate the relationship of metacognitive elaborative rehearsal and content retrieval. Extant data from years 1 (n?=?419) and 2 (n?=?704) of the PACT/RFU project suggests such an effect. As hypothesized, there were no mean differences in reported metacognitive rehearsal use across the groups because metacognitive elaborative rehearsal was not taught. However, regression coefficients for content recall on metacognitive elaboration were greater in the treatment group in both samples suggesting that an instructional emphasis on deep processing leads to better content recall. The findings are discussed in the context of the Common Core State Standards and the large-scale testing programs in place currently across the USA.     

Valuing Science: A Turkish–American comparison

A problem that is still unexplored in the field of socioscientific issues (SSI) and that was explored in this study is how different students decide upon a SSI they are discussing, how their justifications change during the instruction and how they use (or not) the evidence from the learning environment to support their justifications. For the purposes of this study, two classes (12–13-year-old students) with diverse characteristics were selected from two different schools in the UK. Class A students, considered high achievers come from a white-British background. Class B students considered average achievers come from an Asian British background. The students engaged in discussions regarding a SSI (Should we kill the grey squirrel to save the red?), supported by an online learning environment. Students’ written arguments, classroom discussions, and classroom observations were collected and analysed. The findings suggest that even though the two classes engaged with the same learning environment, the decisions and justifications provided by the pairs in the two classes were quite distinct. The students used the evidence from the learning environment in ways which supported their decision, and tended to ignore evidence if these contradicted their decision. Furthermore, students’ justifications support the hypothesis that their decision was based on whether they identified with the actors of the issue. Implications for research include exploring how students identify with the actors of a SSI to enable us to support them overcoming their personal narratives and becoming critical evaluators of scientific knowledge.