Socio-Scientific Issues in Health Contexts: Treading a rugged terrain

The science–technology–society agenda has evolved over time to meet emerging educational aims in the light of changes in society and the environment. There is increasing emphasis on students' decision-making on socio-scientific issues (SSIs) not only to highlight the intricate relationships between science, technology, society, and the environment, but also to allow students to incorporate multiple viewpoints into the development of critical reasoning and responsible citizenship. Most research emphases have been on the rationality of reasoning rather than on the internal psychological context that underpins reasoning. This paper explores how these various aspects of reasoning interact in decision-making on SSIs in health contexts through case studies of recent issues in this field. The case studies reveal the negotiation of multiple influences in addressing SSIs in health contexts and the potential interactions between the psychological processes of individuals, science, and sociocultural perspectives. A tentative model to address these interactions emerges from this explorative study and has implications for the use of health-related issues in promoting SSI education.     

Students’ Ontological Security and Agency in Science Education—An Example from Reasoning about the Use of Gene Technology

This paper reports on a study of how students' reasoning about socioscientific issues is framed by three dynamics: societal structures, agency and how trust and security issues are handled. Examples from gene technology were used as the forum for interviews with 13 Swedish high-school students (year 11, age 17–18). A grid based on modalities from the societal structures described by Giddens was used to structure the analysis. The results illustrate how the participating students used both modalities for ‘Legitimation’ and ‘Domination’ to justify positions that accept or reject new technology. The analysis also showed how norms and knowledge can be used to justify opposing positions in relation to building trust in science and technology, or in democratic decisions expected to favour personal norms. Here, students accepted or rejected the authority of experts based on perceptions of the knowledge base that the authority was seen to be anchored in. Difficulty in discerning between material risks (reduced safety) and immaterial risks (loss of norms) was also found. These outcomes are used to draw attention to the educational challenges associated with students' using knowledge claims (Domination) to support norms (Legitimation) and how this is related to the development of a sense of agency in terms of sharing norms with experts or with laymen.     

Teaching use of formal thought for improved chemistry achievement

Attrition rates from the foundation science programme at the University of Papua New Guinea are high and related to an inability to use formal thought. An intervention measure with marginal students in this foundation course is reported here. This five‐week intensive intervention was intended to assist these marginal students to perform better on formal elements of the chemistry course. Short‐term beneficial effects of intervention were observed but these were not maintained once the intensive programme ceased.     

Socio-scientific issues and the quality of exploratory talk—what can be learned from schools involved in a ‘collapsed day’ project?

This project was designed to examine the feasibility of using a ‘collapsed day’ to explore socio-scientific issues relating to genes and genetic engineering in secondary schools by enabling science and humanities staff to collaborate. It was believed that science staff would have expertise in promoting understanding of genetics and humanities staff would have expertise in managing the ethical debates that emerged. The study took place in eight secondary schools with pupils aged 14–16. A surprising result of the project was the lack of high quality ‘public discourse’ or ‘exploratory talk’ around the ethical dilemmas raised by the topic. An examination of the data suggests that clarity about the nature of the day, teacher expertise in motivating and managing discussion, and pupil experience of discussion might be related to the level of discourse seen.     

Readying the head and steadying the heart: a review of cortical and cardiac studies of preparation for action in sport

Expert sport stars reliably execute their skills with remarkable precision and accuracy. To provide an insight into the mechanisms that underpin the superior performance of experts compared to novices, this article critically reviews experiments that have examined cortical activity (i.e., movement related cortical potentials; EEG spectral power) and cardiac activity (i.e., dynamic changes in heart rate) during preparation for action in self-paced aiming sports. It suggests that decelerations in heart rate and task-specific changes in EEG activity during preparation for action can explain superior expert performance. These psychophysiological responses are interpreted in terms of preparatory information processing and response programming, before suggestions for future research into the psychophysiology of preparation for action are outlined.     

The Relationship of the Sit and Reach Test to Criterion Measures of Hamstring and Back Flexibility in Young Females

Abstract

The purpose of the present investigation was to determine the relationships of the sit and reach test, a component of the American Alliance for Health, Physical Education, Recreation and Dance Health Related Fitness Test, 1980, with criterion measures of back and hamstring flexibility. Young females (N = 100) with a mean age of 14.08 years ± .825 were administered two trials of three tests. The measurements included the sit and reach test, passive hamstring flexibility using a Leighton Flexometer, and a test of back flexibility using a protocol suggested by Macrae and Wright in 1969. Test-retest reliability estimates exceeded .90 for all measurements. Results indicated that the sit and reach test had a moderate relationship (r = .64) with passive hamstring flexibility. The correlations between the sit and reach test and total back flexibility (r = .07), upper back flexibility (r = ?.16), and lower back flexibility (r = .28) were low. These findings indicate the sit and reach test has moderate criterion-related validity when used as an assessment of hamstring flexibility, but appears not to provide a valid assessment of back and, in particular, low back flexibility which is one of the reasons it was included in the Health Related Fitness Test.     

受电弓螺栓连接松动问题分析及解决方案

文章针对某地铁列车受电弓电缆紧固连接的松动问题,从设计方案及装配工艺方面进行了原因分析,提出了相应的解决方案,并阐述了适合于不同松动原因的防松方法。     

概率论原理在预测两种类型天气情况中的应用研究

应用概率论中的原理对两种类型天气情况的预测是一种很有效的方式。文中针对霜降具体日期进行预报的要求提出了采用最大转移概率的方法,对有较大波动性和随机性的时间序列的预报效果较好;对于量化型降水概率预报的要求则采用了区间概率函数方式,转换后的非线性相关因子预报性能大大优于相关因子,且效果较为明显。采用的两种方法具有使用价值,可作为中长期预报的重要工具。     

Contemporary Issues of Social Justice: A Focus on Race and Physical Education in the United States

Ongoing events in the United States show the continual need to address issues of social justice in every social context. Of particular note in this article, the contemporary national focus on race has thrust social justice issues into the forefront of the country's conscious. Although legal segregation has ran its course, schools and many neighborhoods remain, to a large degree, culturally, ethnically, linguistically, economically, and racially segregated and unequal (Orfield & Lee, 2005). Even though an African American president presently occupies the White House, the idea of a postracial America remains an unrealized ideal. Though social justice and racial discussions are firmly entrenched in educational research, investigations that focus on race are scant in physical education literature. Here, we attempt to develop an understanding of social justice in physical education with a focus on racial concerns. We purposely confine the examination to the U.S. context to avoid the dilution of the importance of these issues, while recognizing other international landscapes may differ significantly. To accomplish this goal, we hope to explicate the undergirding theoretical tenants of critical race theory and culturally relevant pedagogy in relation to social justice in physical education. Finally, we make observations of social justice in the physical education and physical education teacher education realms to address and illuminate areas of concern.