Preservice elementary teachers' conceptions of moon phases before and after instruction

This study focused on the conceptual understandings held by 78 preservice elementary teachers about moon phases, before and after instruction. Participants in the physics groups received instruction on moon phases in an inquiry‐based physics course; participants in the methods group received no instruction on moon phases. The instructive effect of two different types of preinstruction interviews also was compared. The instruction on moon phases used in the study is from Physics by Inquiry by Lillian McDermott. In the study, the method of inquiry followed a qualitative design, involving classroom observations, document analysis, and structured interviews. Inductive data analysis identified patterns and themes in the participants' conceptual understanding. Results indicate that without the instruction, most preservice teachers were likely to hold alternative conceptions on the cause of moon phases. Participants who had the instruction were much more likely to hold a scientific understanding after instruction. The instruction appears to be more effective in promoting a scientific understanding of moon phases than instruction previously reported in the literature. It also appears that using a three‐dimensional model or making two‐dimensional drawings during the preinstruction interviews does not have instructive value. © 2002 Wiley Periodicals, Inc. J Res Sci Teach 39: 633–658, 2002     

Children's conceptions of the changes of state of water

Children are very familiar with water, ice, and steam as these things have been part of their lives since they first crawled into the kitchen. In this study children's conceptions about familiar phenomena associated with water, e.g., evaporating, condensing, boiling, and the melting of ice, were investigated using a clinical interview technique. The prevalence of specific views at particular age levels was also studied. The results of the investigation indicate that children do have ideas about the changes of state of water which are quite different from the views of scientists. It would also appear that these ideas can sometimes be influenced in unintended ways by science teaching. The implications of these findings for teaching are discussed.     

Children's conceptions of the situational affective consequences of sociomoral events

Children's conceptions of the linkages between sociomoral events and emotional consequences were examined in a 2-part study. In Part 1, kindergartners, third graders, and sixth graders assessed the probable emotional consequences of 6 types of sociomoral events (inhibitive morality, active morality, conventional, personal, distributive justice, and prosocial morality) on several event participants (initiator and recipient of the action, adult and child observers, and subject as observer). Results indicated that children's conceptions were highly differentiated, reflecting a general sensitivity to differences in both types of sociomoral events and the roles of individuals in these events. An additional sociomoral event X event interaction indicated, however, that conceptions within some sociomoral events also depended on the particular roles of the event participants. In Part 2 of the study, the social event-emotion linkage was reversed. Children were presented with depictions of the affective reactions of sociomoral participants and selected which of 2 sociomoral events was more likely to have produced those reactions. Overall, children were able to match affective information representative of each sociomoral category to the appropriate eliciting sociomoral event.     

Camila,the earth,and the sun: Constructing an idea as shared intellectual property

Recent research has challenged traditional assumptions that scientific practice and knowledge are essentially individual accomplishments, highlighting instead the social nature of scientific practices, and the co‐construction of scientific knowledge. Similarly, new research paradigms for studying learning go beyond focusing on what is “in the head” of individual students, to study collective practices, distributed cognition, and emergent understandings of groups. These developments require new tools for assessing what it means to learn to “think like a scientist.” Toward this goal, the present case study analyzes the discourse of a 6th‐grade class discussing one student's explanation for seasonal variations in daylight hours. The analysis identifies discourse moves that map to disciplinary practices of the social construction of science knowledge, including (1) beginning an explanation by reviewing the community's shared assumptions; (2) referencing peers' work as warrants for an argument; and (3) building from isolated ideas, attributed to individuals, toward a coherent situation model, attributed to the community. The study then identifies discourse moves through which the proposed explanation was taken up and developed by the group, including (4) using multiple shared representations; (5) leveraging peers' language to clarify ideas; and (6) negotiating language and representations for new, shared explanations. Implications of this case for rethinking instruction, assessment, and classroom research are explored. © 2009 Wiley Periodicals, Inc. J Res Sci Teach 47:619–642, 2010     

Children's conceptions of probability — A psychological and pedagogical review

This paper identifies a number of key questions concerning children's understanding of probability. A selection of psychological and pedagogical research studies is evaluated. Attention is drawn to the various definitions of probability assumed by their authors, indicating the relevance of these to an understanding and synthesis of the reported findings. The possibility of basing relevant classroom practice on subjective rather than theoretical concepts of probability is discussed.     

Reasoning about structure and function: Children's conceptions of gears

Twenty-three second graders and 20 fifth graders were interviewed about how gears move on a gearboard and work in commonplace machines. Questions focused on transmission of motion; direction, plane, and speed of turning; and mechanical advantage. Several children believed that meshed gears turn in the same direction and at the same speed. Many second graders provided very incomplete explanations of transmission of motion. Most children confused mechanical advantage with speed. Yet as the interview proceeded, several fifth graders generalized conceptions about transmission of motion into a rule about turning direction. They increasingly justified their ideas about gear speed by referring to ratio. Children's reasoning became more general, formal, and mathematical as problem complexity increased, suggesting that mathematical forms of reasoning may develop when they provide a clear advantage over simple causal generalizations. © 1998 John Wiley & Sons, Inc. J Res Sci Teach 35: 3-25, 1998.     

The use of a computer simulation to promote scientific conceptions of moon phases

This study described the conceptual understandings of 50 early childhood (Pre‐K‐3) preservice teachers about standards‐based lunar concepts before and after inquiry‐based instruction utilizing educational technology. The instructional intervention integrated the planetarium software Starry Night Backyard™ with instruction on moon phases from Physics by Inquiry by McDermott (1996). Data sources included drawings, interviews, and a lunar shapes card sort. Videotapes of participants' interviews were used along with the drawings and card sorting responses during data analysis. The various data were analyzed via a constant comparative method in order to produce profiles of each participant's pre‐ and postinstruction conceptual understandings of moon phases. Results indicated that before instruction none of the participants understood the cause of moon phases, and none were able to draw both scientific moon shapes and sequences. After the instruction with technology integration, most participants (82%) held a scientific understanding of the cause of moon phases and were able to draw scientific shapes and sequences (80%). The results of this study demonstrate that a well‐designed computer simulation used within a conceptual change model of instruction can be very effective in promoting scientific understandings. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 45: 346–372, 2008     

Children's conceptions of air pressure: exploring the nature of conceptual change

Children's responses to a series of air pressure activities were tracked in detail during group discussion and interview, and again in interview six months later. Results for different age cohorts have yielded insights into age‐related knowledge components framing children's conceptions of air pressure phenomena. Case studies of individuals have been constructed to explore the way conceptions change over time, and the difficulties presented by the concept of atmospheric pressure. These are used to evaluate different structural theories of conceptual change. The findings point to the complexity of children's conceptions, the stability and extension over time of productive conceptions, and the critical role of contextual features of phenomena in the conceptual change process. Although structural aspects of changes in concepts related to air pressure are identified, the difficulty of accessing the atmospheric pressure conception is argued to have more to do with presupposition based in perceptual features of air, and with difficulties associated with the application to particular phenomena.     

Children's agency beliefs, cognitive performance, and conceptions of effort and ability: individual and developmental differences

In order to understand how children's beliefs and cognitive performance vary according to development in their conceptions of effort and ability, 120 fourth and sixth graders were given the following assessments: (a) a measure of agency beliefs, defined as the extent to which persons believe they have access to certain classes of potential means, including effort, ability, powerful others, and luck; (b) a battery of intelligence test scales, including figural patterns, letter series, arithmetic, and spelling; (c) an interview designed to assess developmental levels in conceptions of effort and ability. Correlations between intelligence scores and agency beliefs for effort decreased with increasing levels of reasoning about effort and ability, but correlations between intelligence scores and agency beliefs for ability increased with increasing levels of reasoning. No such trends were found in correlations between performance and agency beliefs for luck or for unknown causes. The results are discussed in terms of the interaction between individual differences and developmental change.     

British Asian women and the costs of higher education in England

This article will examine Asian women’s experiences of financial support in higher education. The article is based on 30 in-depth interviews with Asian women who were studying at a ‘new’ (post-1992) university in the South East of England. Women identified themselves as Muslim, Hindu and Sikh. The findings reveal that women’s religious and cultural background affects their attitudes towards financial support whilst at university. Through their participation in higher education, women are able to use their social and ethnic capital to enable them to receive financial and other kinds of support necessary for their success in higher education.     

Rankings,Diversity and the Power of Renewal in Science. A Comparison between Germany,the UK and the US

Rankings are part and parcel of the neoliberal agenda in science aiming at increasing the competitive allocation of funds among universities. This article focuses on the decreasing power of renewal in science as a result of this agenda particularly because of its increasingly consolidated stratification of the academic system into élite and mass institutions. A comparison based on data from the Academic Ranking of World Universities of the Shanghai Jiao Tong University between the less stratified German system, the more strongly stratified British system, and the most strongly stratified, though at its heart still diverse US-American system provides a first test of the hypotheses.     

What Makes a Person British? Children's conceptions of their national culture and identity

During the past decade, the cultural restorationist wing of the New Right has sought to impose its own anachronistic and sentimental conception of ‘British culture’ on schools and colleges. This conception, which is little more than a glib celebration of quintessential ‘Englishness’, characterises the national culture in largely monolithic and ethnically undifferen‐tiated terms. Concerned about the possible pernicious effects of educational policies inspired by such thinking, we present the findings of a recently completed ethnographic study of 8‐11 year‐olds’ conceptions of British national culture. Our paper considers the extent to which children's understanding of this complex form of collective identity may vary with age, and ethnicity. We conclude by exploring the implications of the findings for anti‐racist and multicultural education.     

Narratives, choices, alienation, and identity: learning from an elementary science teacher

As we contemplate on teacher identity research, there is a need to place a teacher’s narratives or story-lines at the center of that work. In this forum, in response to the insightful commentary from Stephen Ritchie and Maria Iñez Mafra Goulart and Eduardo Soares, I place a greater emphasis on understanding Daisy’s narratives from an existing social identity framework. Narratives tell us intricate and complex actions that a teacher has taken both personally and professionally. Additionally, narratives help us see implicit nature of identity explicitly. Therefore, a greater focus has to be placed on interactions and utterances of a teacher to make sense of who they are and what they do as expressed by their own words (identity and action). Finally, I join with Ritchie and Goulart and Soares to advocate that identity research needs to include participants as co-researchers and co-authors as identities are very personal and complex to be fully understood by the outsiders (researchers).     

利用会计信息,加强国有资本管理与监督

造成国有资产流失的因素是多方面的,但主要是会计信息不准确,会计监督缺乏有力措施,本文在探讨国有资产管理的基础上,提出一些加强会计核算管理的措施。     

'That's what scientists have to do': Preservice elementary teachers' conceptions of the nature of science during a moon investigation

In a science methods course for elementary education majors, students investigated the phases of the moon for six weeks. The moon investigation emphasized that scientific knowledge: a) is empirically based; b) involves the invention of explanations; and c) is socially embedded. After the moon investigation, students realized that scientists make observations and generate patterns, but failed to recognize that observation could precede or follow theory building. Students could separate the processes of observing from creating explanations in their learning, but did not articulate the role of invention in science. Similarly, students valued the social dimensions of learning, but were unable to apply them to the activity of scientists. Although our teaching was explicit about students' science learning, we did not help them make direct connections between their science learning activities and the nature of science [NOS]. We provide a set of recommendations for making the NOS more explicit in the moon investigation.     

Hans Bethe, the sun and the neutrinos

We give an elementary review of recent discoveries in neutrino physics, culminating in the solution of the solar neutrino problem and the discovery of neutrino mass. Atmospheric neutrinos, reactor neutrinos and other important developments are also briefly described. G Rajasekaran is a theoretical physicist at the Institute of Mathematical Sciences, Chennai. His field of research is quantum field theory and high energy physics. Currently he is working in the area of neutrino physics.     

农业上市公司资本结构对获利能力影响的实证研究

资本结构影响着获利能力,而不同的行业又具有不同的资本结构。以农业上市公司为研究对象,运用因子分析法求得上市公司的获利能力得分值,然后运用线性回归方法研究资本结构对获利能力的影响。研究结果表明农业上市公司获利能力与其资本结构之间存在着较强的线性关系;农业上市公司资本结构对其获利能力呈现负相关的影响;农业上市公司资本结构呈现逐渐优化的趋势。     

A Shoelace Left Untied: Teachers Negotiate Class and Ethnicity in a City of Northern England

Using qualitative research methods supported by demographic data, the role of castelike class patterns in British schooling and the participation of teacher mentalities in maintaining images of working-class students and their families within urban communities were examined. The common American assumption that race is the most salient, if not the sole, designator of resistance to schooling was challenged as teachers and administrators in three urban schools in the north of England presented their experiences and views of working with low-income urban students. In returning as an American researcher to the city of her British family, the author brings a unique cross-cultural lens to the analysis of ethnicity and class.