Constraints on the Calibration of Performance

We examined the effect of experimenter-controlled incentives and feedback on the calibration of performance. Subjects answered 36 reading comprehension and 8 mathematical multiple-choice questions and rated the accuracy of their responses. Perfect calibration was possible only when true and estimated test performance were approximately equal. Incentives for improved performance (i.e., doubling the credit people received for correct answers) adversely affected performance and calibration compared to the same incentives for improved calibration (i.e., doubling credit for minimizing the error between true and estimated performance). Feedback had no effect on performance or accuracy nor did it interact with the incentive variable. An examination of coefficient α suggested a strong response bias by individuals when calibrating their performance; individuals tended to rate their performance accuracy consistently regardless of item difficulty or whether they answered the item correctly. Educational implications were discussed.     

A Critique of the Stem Pipeline: Young People’s Identities in Sweden and Science Education Policy

In this article, we develop critiques of the pipeline model which dominates Western science education policy, using discourse analysis of interviews with two Swedish young women focused on ‘identity work’. We argue that it is important to unpack the ways that the pipeline model fails to engage with intersections of gender, ethnicity, social class and nationality, and their impact on science and with debates about science as elitist and implicated in neoliberalism.     

Assessment revisited: a review of research in Assessment and Evaluation in Higher Education

A review of articles published in Assessment and Evaluation in Higher Education, over the last eight years (2006–2013) on assessment in higher education, since the introduction of the Bologna process, is the subject of the paper. The first part discusses the key issue of assessment in higher education and the method used for selecting articles. The second part presents results according to the main emerging themes arising from data analysis: assessment methods, modes of assessment and assessment related to a given teaching and learning method. The paper concludes that the foci of the studies are aligned with assessment practices other than the written test, in accordance with a learner-oriented perspective. Although the implementation of the Bologna process has had different kinds of impact in different European countries, the review shows that the use and effects of a diversity of assessment methods in higher education have been investigated, particularly those pointing to the so-called alternative methods. Implications of the findings are discussed.     

Counterspaces for women of color in STEM higher education: Marginal and central spaces for persistence and success

Counterspaces in science, technology, engineering, and mathematics (STEM) are often considered “safe spaces” at the margins for groups outside the mainstream of STEM education. The prevailing culture and structural manifestations in STEM have traditionally privileged norms of success that favor competitive, individualistic, and solitary practices—norms associated with White male scientists. This privilege extends to structures that govern learning and mark progress in STEM education that have marginalized groups that do not reflect the gender, race, or ethnicity conventionally associated with STEM mainstream success, thus necessitating spaces in which the effects of marginalization may be countered. Women of color is one such marginalized group. This article explores the struggles of women of color that threaten their persistence in STEM education and how those struggles lead them to search out or create counterspaces. It also examines the ways that counterspaces operate for women of color in STEM higher education, particularly how they function as havens from isolation and microaggressions. Using a framework of Critical Race Theory (CRT) and intersectionality theory and drawing on interview data from 39 women of color about their STEM higher education experiences, we describe five ways in which counterspaces operate: in peer‐to‐peer relationships; mentoring relationships; national STEM diversity conferences; STEM and non‐STEM campus student groups; and STEM departments. Whereas most research has discussed counterspaces as racially or ethnically homogeneous social groups of peers at the margins, our research found that counterspaces vary in terms of the race/ethnicity, gender, and power levels of participants. We found that counterspaces can be physical settings, as well as conceptual and ideological. Additionally, we identified counterspaces both at the margins and at the center of STEM departments. Thus, our research expands the existing understanding of the types and functions of counterspaces and broadens the definition of what locations can be and should be considered counterspaces. © 2017 The Authors. Journal of Research in Science Teaching Published by Wiley Periodicals, Inc. on behalf of National Association for Research in Science Teaching. J Res Sci Teach 55: 206–245, 2018     

What does ‘natural capital’ do? The role of metaphor in economic understanding of the environment

At the time of its introduction at the end of the 1980s, the concept of natural capital represented new, more ecologically aware thinking in economics. As a symbol of novel thinking, the metaphor of natural capital stimulated a debate between different disciplinary traditions on the definitions of the concept and research priorities and methods. The concept became a means to control the discourse of sustainable development. In this paper, I focus on the power/knowledge implications of the use of the concept, and I follow the career of the concept of natural capital in ecological economic publications between the years 1988 and 2000. The main interests are: (1) in the use of the concept to affect the rules according to which claims concerning sustainable development can be made and (2) in the constitution of objects of environmental knowledge.     

Cumulative Risk,the Mother–Child Relationship,and Social-Emotional Competence in Latino Head Start Children

Research Findings: Supportive mother–child interactions promote the development of social-emotional competence. Poverty and other associated psychosocial risk factors have a negative impact on mother–child interaction. In spite of Latino children being disproportionately represented among children living in poverty, research on mother–child interactions among economically disadvantaged Latino families remains scarce and results are mixed. The current study used an ecological approach to examine the relationship between maternal cumulative risk, child developmental delay, observed and self-reported quality of the mother–child relationship, time spent in Head Start, and teachers’ and parents’ ratings of social-emotional competence among 106 Latino Head Start children and their mothers. Cumulative risk showed a negative association with observed maternal supportiveness and self-reported quality of the mother–child relationship. Cumulative risk had negative and positive indirect effects, respectively, on child social competence and problem behavior through perceived quality of the mother–child relationship. This association only occurred when parent ratings of child behavior were used. Time spent in Head Start moderated the association between observed maternal supportiveness and social competence. Practice or Policy: Implications for providers and researchers attempting to improve social-emotional competence in disadvantaged Latino children by enhancing positive and supportive parenting practice are discussed.     

硅橡胶反应性杂化材料制备及其性能研究

以六甲基二硅氧烷、双乙烯基四甲基二硅氧烷和硅酸乙酯为主要原料,合成加成反应型单体。红外和电子透镜分析结果表明,该单体中含有乙烯基、羟基和[SiO1/2]等基本结构,单体中的[SiO2]单元以2～10nm的聚集体形式存在。随该纳米单体的加入,硅橡胶拉伸强度提高为增强前的7～8倍,击穿强度增高4kV·(mm)-1左右;相对介电常数增大,介质损耗也相应发生变化。     

Analogical encoding with and without instructions for case comparison of scientific phenomena

The study aimed to extend current research on conditions that better support analogical encoding through mutual alignment. We focused on two variables that have not been examined independently in previous studies: the joint presentations of two cases of a scientific phenomenon and the explicit instructions for comparison. One hundred and sixty-five 5th graders and one hundred and sixty-eight 7th graders were presented with two pairs of scenarios, one about heat flow and the other about the state change of matter. Participants were randomly assigned to three conditions: sequential presentation of scenarios, joint presentation of scenarios and joint presentation of scenarios with explicit instructions to compare analogically. Results show that for both pairs of scenarios, analogical encoding was promoted more in the condition of joint presentation of scenarios with instructions for comparison. In addition, 7th graders benefited more from this condition than 5th graders.     

Children's Understanding of Agriculture as an economic activity: the role of figurative information

This paper presents the results of a curriculum of basic economic concepts given to 5 fourth-grade classes (Ss=95). The main topic of this curriculum was the production and distribution of agricultural produce, which had already proved to be difficult for the children. The proposed curriculum was largely inspired by the idea that familiarity with «social scenes» related to the economic process in question is necessary (although not sufficient) to allow children to understand such concepts. Children's level of understanding was tested before and after the curriculum by means of a semi-structured interview on 3 main topics: farmers' use of produce; farmers' use of earnings; produce distribution. Answers were scored according to their complexity and correctness; variance analyses performed on the scores showed significant improvements, as well as differences between classes. A qualitative analysis of children's answers was also performed, with the aim of interpreting the nature of change in each topic.     

Children with dyslexia show an inhibition domain-specific deficit in reading

Reading and Writing - Children with dyslexia face persistent difficulties in acquiring reading skills, often making guessing errors characterized by the replacement of a word by an orthographic...