SiO2负载纳米级SO42-/TiO2固体超强酸的制备及其催化合成乙酸丁酯的研究     

张萍 《唐山师范学院学报》2003,25(2):41-42

制备了SiO2负载纳米级SO4^2-/TiO2固体超强酸，对其催化活性、重复使用效果、失活原因及再生方法进行了研究。  相似文献   

Development of shared vision: Lessons from a science education community collaborative     

Amy Robertson 《科学教学研究杂志》2007,44(5):681-705

This is a qualitative case study of a collaboration among multiple stakeholders in science education who came together in order to create environmental field trips and the surrounding classroom curriculum. The collaboration involves 4 major facets of science education: formal education at the elementary and university levels, informal education, and educational research. The data were collected by means of observation, semi‐structured interviews, and written document review. This study examines how shared vision developed within the collaboration, the roles the participants played in its evolution, and how this process benefited both the collaboration and each individual collaborator. Several factors significantly affected the progress towards a shared vision and a successful collaboration including time, communication, understanding others' perspectives, dedication and ownership, as well as the collaborative environment. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 44: 681–705, 2007  相似文献   

河北大学后勤集团饮食管理系统的设计与实现     

郭字周  边小凡  李彩霞 《河北软件职业技术学院学报》2003,5(1):16-18

本文阐述了为提高河北大学后勤集团饮食管理的质量所开发的饮食管理系统的设计与实现。  相似文献   

An Illusory Interiority: Interrogating the discourse/s of inclusion     

Linda J.  Graham & Roger  Slee 《Educational Philosophy and Theory》2008,40(2):277-293

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Science achievement of english language learners in urban elementary schools: Results of a first‐year professional development intervention     

Okhee Lee  Jaime Maerten‐Rivera  Randall D. Penfield  Kathryn LeRoy  Walter G. Secada 《科学教学研究杂志》2008,45(1):31-52

This study is part of a 5‐year professional development intervention aimed at improving science and literacy achievement of English language learners (or ELL students) in urban elementary schools within an environment increasingly driven by high‐stakes testing and accountability. Specifically, the study examined science achievement at the end of the first‐year implementation of the professional development intervention that consisted of curriculum units and teacher workshops. The study involved 1,134 third‐grade students at seven treatment schools and 966 third‐grade students at eight comparison schools. The results led to three main findings. First, treatment students displayed a statistically significant increase in science achievement. Second, there was no statistically significant difference in achievement gains between students at English to Speakers of Other Language (ESOL) levels 1 to 4 and students who had exited from ESOL or never been in ESOL. Similarly, there was no significant difference in achievement gains between students who had been retained on the basis of statewide reading test scores and students who had never been retained. Third, treatment students showed a higher score on a statewide mathematics test, particularly on the measurement strand emphasized in the intervention, than comparison students. The results indicate that through our professional development intervention, ELL students and others in the intervention learned to think and reason scientifically while also performing well on high‐stakes testing. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 45: 31–52, 2008  相似文献   

What ‘ideas-about-science’ should be taught in school science? A chemistry teachers’ perspective     

Mansoor Niaz 《Instructional Science》2008,36(3):233-249

The objective of this study is to facilitate in-service chemistry teachers’ understanding of nature of science and what ‘ideas-about-science’ can be included in the classroom. The study is based on 17 in-service teachers who had registered for a 11-week course on ‘Epistemology of Science Teaching’ as part of their Master’s degree program. The course is based on 17 readings drawing on nature of science and its critical evaluation. Course activities included written reports, classroom discussions based on participants’ presentations and written exams. Based on the results obtained this study has the following educational implications: (a) Experimental data need to be interpreted carefully due to underdetermination of theories by data; (b) Kuhn’s normal science manifests itself in the science curriculum through the scientific method and wields considerable influence; (c) Trilemma posed by Collins (Stud Sci Educ 35:169–173, 2000), viz., creation of new knowledge ⇔ Kuhn’s normal science ⇔ teaching nature of science, provided a big challenge and was thought provoking; (d) Of the different aspects of nature of science suggested by experts, these teachers endorsed the following as most important: Creativity, Historical development of scientific knowledge, Diversity of scientific thinking and Scientific method and critical testing; (e) With respect to the contradiction between the positions of Lederman et al. (J Res Sci Teach 39:497–521, 2002) and Osborne et al. (J Res Sci Teach 40:692–720, 2003), few supported the position of latter, viz., inclusion of scientific method in the classroom and a majority supported the former, viz., scientific method as a myth; and (f) Participants were critical of the present stage of research with respect to the scientific method and suggested the introduction of history, philosophy and epistemology of science to counteract its influence.  相似文献   

A Student-centred Approach: Assessing the Changes in Prospective Science Teachers’ Conceptual Understanding by Concept Mapping in a General Chemistry Laboratory     

Osman Nafiz Kaya 《Research in Science Education》2008,38(1):91-110

Although researchers in higher education propose alternatives to traditional approaches to assessment, traditional methods are commonly used in college or university science courses. The purpose of this study was to explore the feasibility and validity of Prospective Science Teachers’ (PSTs) concept maps as authentic assessment tools in a student-centred approach to describe the changes in the conceptual understanding of the PSTs in general chemistry laboratory investigations. After the PSTs (n = 47) decided on important issues, such as who would assess their concept maps and what scoring strategy and criteria would be used, they practiced assessing their own and peers’ concept maps during the first five laboratory investigations. They subsequently constructed and assessed pre- and post-laboratory concept maps in a student-centred approach consisting of self, peer, and instructor assessments for the five remaining laboratory investigations. The results of the study showed using pre- and post-laboratory concept maps as authentic assessment tools in a student-centred approach was valid and reliable for describing the conceptual understanding of the PSTs in a university general chemistry laboratory course. The results of individual interviews indicated most PSTs had positive views of their assessment practices in the laboratory course. This study also provides pedagogical implications for the training of science teachers.  相似文献   

Practices and Innovations in Australian Science Teacher Education Programs     

David Palmer 《Research in Science Education》2008,38(2):167-188

This paper reports part of a larger study which was designed to investigate current practices in initial teacher education programs in Australia. The main data collection was by telephone interviews, which were carried out with science education specialists and program coordinators at all institutions which offer primary teacher education or secondary science teacher education. The interviews focused on practices in relation to program structures, science content studies, science methods studies and links to science-related school projects or to science business/industry. A large number of innovative practices were described. In addition, several case studies were carried out, which focused on particular innovations. The study identified several aspects of science teacher education which were of concern.  相似文献   

Revisiting the Conceptualisation of Pedagogical Content Knowledge (PCK): PCK as a Conceptual Tool to Understand Teachers as Professionals   总被引：2，自引：0，他引：2  

Soonhye Park  J. Steve Oliver 《Research in Science Education》2008,38(3):261-284

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Gender Disparity in STEM Disciplines: A Study of Faculty Attrition and Turnover Intentions   总被引：1，自引：0，他引：1  

Yonghong Jade Xu 《Research in higher education》2008,49(7):607-624

This study examines the underrepresentation of women faculty in science, technology, engineering, and mathematics (STEM) by comparing the intentions of attrition and turnover between genders in Research and Doctoral universities. It is found that the two genders did not differ in their intentions to depart from academia, but women faculty had a significantly higher likelihood to change positions within academia. The indications are that women and men are equally committed to their academic careers in STEM; nonetheless, women’s stronger turnover intentions are highly correlated with dissatisfaction with research support, advancement opportunities, and free expression of ideas. The findings suggest that the underrepresentation of women is more convincingly explained by an academic culture that provides women fewer opportunities, limited support, and inequity in leadership, rather than by gender-based differences such as roles in family responsibilities. Changes in academic STEM culture are needed in order to attract more women scientists and narrow the current gender gap.  相似文献