Hydraulic variable-speed transmissions as servomotors

The hydraulic transmission is an important form of servomotor about which little has been written from the viewpoint of the servomechanisms specialist. This paper presents an analysis of the hydraulic transmission; and, for three transmissions, a comparison between the predicted behavior based on the analysis and the measured behavior observed by frequency response tests. Discrepancies between predicted and measured performance are discussed and conclusions drawn. Suggestions are made for improvement of transmission performance. Data necessary for calculations on the transmissions tested are given in the appendix.     

Acquired equivalence and generalized suppression in a virtual reality environment

Acquired equivalence was investigated using a virtual reality conditioned suppression task administered in a first-person-shooter game. Two visual cues, A1 and B1, were followed by a tone (O1), and another two cues, A2 and B2, were followed by another tone (O2). During differential Pavlovian conditioning, A1 was paired with an instructed unconditioned stimulus (US) consisting of a flashing white screen, whereas A2 was not. All cues and outcomes were then presented at test, in the absence of the US, and suppression ratios were calculated for multiple response topographies (shots, hits, and breaks). Clear evidence of the suppression of shots was seen for A1 and B1, with no suppression being seen for either A2 or B2. Presentations of O1 and O2 resulted in significant suppression of shots and hits, whereas only O1 led to the suppression of breaks. The US expectancy ratings were consistent with these behavioral results. The findings are discussed in the light of differing accounts of acquired equivalence.     

There Is More to Educational Measurement Than Measuring: The Importance of Embracing Purpose Pluralism

The dominant narrative for assessment design seems to reflect a strong, albeit largely implicit undercurrent of purpose purism, which idealizes the principle that assessment design should be driven by a single assessment purpose. With a particular focus on achievement assessments, the present article questions the tenability of purpose purism, explaining how critical decisions—concerning whether to assess, how to specify an assessment construct, and many other design characteristics—require the coordination of multiple perspectives on assessment purposes. It argues the case for purpose pluralism—which idealizes the principle that assessment design should be driven by a multiplicity of assessment purposes simultaneously—not as an occasional, unavoidable concession, but as an organizing principle. The point of explicitly distinguishing between perspectives is to help assessment designers to establish a full complement of design requirements, representing a full range of stakeholder voices; as well as to manage more effectively the trade‐offs and compromises that inevitably arise.     

Exploring mathematics identity: an intervention of early childhood preservice teachers

ABSTRACT

Early childhood and elementary preservice teachers often fear mathematics, find it irrelevant, have mathematics anxiety, hold negative self-perceptions, and have low mathematics achievement. This study investigates the influence of an identity exploration intervention on preservice teachers’ mathematics identities during a college Algebra course specifically designed for education majors. Results provide insight into the patterns of change in identity and motivation. Data was analyzed following a theoretical framework on role identity that highlights the interaction between self-perceptions, beliefs, goals, and action possibilities. Analysis identified patterns of change in student identities. Themes across cases highlight the differences in change amongst participants, the influence of initial identity, and the impact of perceived relevance on identity exploration.     

Culture and Survival: the role of symbol in improving the quality of a comprehensive school

The relationship between organisational culture and effectiveness is one of the dominant themes in current organisational and management theory. The major problem in the field is to establish a clear link between cultural change and increased effectiveness. The article illustrates one aspect of this relationship. Data for a comprehensive school in a London borough illustrate a steady decline in its intake and in the 11 + component of that intake. It then describes the steps taken by the head and staff collectively to strengthen the culture of the school. The data shows the consequent rise in both the overall intake and its 11 + component.     

Developing and assessing beginning teacher effectiveness: the potential of performance assessments

The Performance Assessment for California Teachers (PACT) is an authentic tool for evaluating prospective teachers by examining their abilities to plan, teach, assess, and reflect on instruction in actual classroom practice. The PACT seeks both to measure and develop teacher effectiveness, and this study of its predictive and consequential validity provides information on how well it achieves these goals. The research finds that teacher candidates’ PACT scores are significant predictors of their later teaching effectiveness as measured by their students’ achievement gains in both English language arts (ELA) and mathematics. Several subscales of the PACT are also influential in predicting later effectiveness: These include planning, assessment, and academic language development in ELA, and assessment and reflection in mathematics. In addition, large majorities of PACT candidates report that they acquired additional knowledge and skills for teaching by virtue of completing the assessment. Candidates’ feelings that they learned from the assessment were the strongest when they also felt well-supported by their program in learning to teach and in completing the assessment process.     

Mathematics as personal and social activity

European Journal of Psychology of Education -     

The Role of a Caring-Based Intervention in a Physical Activity Setting

This preliminary study examined the effect of a caring-based versus a traditionally-focused physical activity intervention on underserved adolescents’ perceptions of the caring climate, the motivational climate, empathetic concern, enjoyment, and future anticipated participation. Multiethnic youth (N = 353) aged 9 to 17 involved in two National Youth Sports Program (NYSP) sites participated in the study. The Caring Group (n = 90) participated in a program infused with themes of caring while the Traditional Group (n = 263) followed prototypical NYSP training, practices, and procedures. Self report assessments were gathered after 5 weeks in either setting. After accounting for demographic differences findings revealed that the Caring Group perceived significantly higher levels of a caring climate, empathetic concern, future expected participation, and lower levels of perceptions of an ego-involving motivational climate. The relevance of these findings with respect to the optimal development of youth is discussed. Dr. Maria Newton is a faculty member in the Department of Exercise and Sport Science at the University of Utah. She is interested in optimizing the impact of physical activity on the psychosocial and social-emotional development of underserved youth. She teaches courses in sport psychology, motivation, and character development. Dr. Doris Watson is an Associate Professor in the Department of Sports Education Leadership at the University of Nevada Las Vegas. Dr. Lori Gano-Overway is an Assistant Professor in the Department of Health and Exercise Science at Bridgewater College. Dr. May Fry is affiliated with Department of Health, Sport and Exercise Sciences, The University of Kansas, Lawrence. Dr. Mi-Sook Kim is an Associate Professor in the Department of Kinesiology at San Francisco State University and Dr. Michelle Magyar is an Assistant Professor in the Department of Kinesiology at CSU-Long Beach. Bio and teaching/research interests available upon request.     

Improving Opportunities for Bridging Social Capital: The Story of a Full-Service Community School Initiative at an Alternative High School

Abstract

This article describes the collective efforts educators and multiple community partners are taking to transform one alternative urban high school into a full-service community school. The article presents preliminary findings on the opportunities for bridging social capital that the full-service initiative has created and the impacts such opportunities have for students in urban alternative settings with multiple risk factors stacked against them.