Vacuum interrupter, high reliability component of distribution switches, circuit breakers and contactors

The use of vacuum interrupters(VIs)as the current interruption component for switches,circuit breakers,reclosers and contactors operating at distribution voltages has escalated since their introduction in the mid-1950’s.This electrical product has developed a dominating position for switching and protecting distribution circuits.VIs are even being introduced into switching products operating at transmission voltages.Among the reasons for the VI’s popularity are its compactness,its range of application,its low cost,its superb electrical and mechanical life and its ease of application.Its major advantage is its well-established reliability.In this paper we show how this reliability has been achieved by design,by mechanical life testing and by electrical performance testing.We introduce the“sealed for life”concept for the VI’s integrity.We discuss this in terms of what is meant by a practical leak rate for VIs with a life of over 30 years.We show that a simple high voltage withstand test is an easy and effective method for monitoring the long-term vacuum integrity.Finally we evaluate the need for routine inspection of this electrical product when it is used in adverse ambient environments.     

Distinct Age‐Related Differences in Temporal Discounting and Risk Taking in Adolescents and Young Adults

Age‐related differences in temporal discounting (TD) and risk taking, and their association, were examined in adolescents and young adults (n = 337) aged 12–27 years. Since monetary rewards are typically used in TD and risk‐taking tasks, the association between monetary reward valuation and age and decision making in these tasks was explored as well. TD declined linearly with age, with a particularly sharp decline from 15 to 16 years. In contrast, risk taking was not correlated with age and TD. Reward valuation was not associated with TD and risk taking, and age‐related differences in TD remained significant after controlling for reward valuation. Together, these findings suggest that risk taking and TD are two separate constructs with distinct age‐related differences in adolescence and young adulthood.     

E‐mail communication in workplace romantic relationships

This study examined workplace romantic relationship partners’ e‐mail practices and perceptions. Results suggest that the relationship may play an integral role in determining participants' uses and perceptions of e‐mail Workplace romantic couples used e‐mail as frequently as face‐to‐face communication to interact with romantic partners and rated it as both rich and important Participants used e‐mail for both work‐related and social tasks. In addition, participants used business e‐mail addresses for communicating with relational partners and perceived that few organizational policies existed regarding its use. Theoretically, these findings suggest the importance of studying the relationship as a factor that affects e‐mail practices and perceptions. Practically, results indicated that e‐mail may present an additional channel for enhancing communication and connectedness in workplace romantic relationships, and that organizations may need to reflect more carefully about policies concerning e‐mail use in the workplace.     

Reconceptualizing and Reexamining Suspense as a Predictor of Mediated Sports Enjoyment

Suspense is a driving force behind media entertainment consumption. However, previous explorations of the role of suspense in the enjoyment of mediated sports have not fully relied upon the richness of research from other genres. The current study seeks to correct this oversight by using the lens of fictional drama to reconceptualize and reexamine suspense as a factor in the enjoyment of sports programming. A total of 161 participants viewed and rated 1 of 7 men's basketball games. The results suggest that a measure of the unfolding nature of suspense is a stronger predictor of mediated sports enjoyment than those used previously.     

The assessment of severely intellectually disabled students

In 1995 it became mandatory to establish individual educational plans (IEPs) for children with special educational needs in the Swedish compulsory school. On the basis of the pupils' needs, such a plan should contain information about the pupils' school situation and performance, the class, teaching etc. The aim of this article was to study how special educational needs are defined and described and what support measures the school is suggesting, using IEPs from a sample of Swedish compulsory schools. Our study is based on an analysis of IEPs for pupils with special educational needs in the nine‐year compulsory school in a municipality in northern Sweden. A strategic selection of three compulsory schools was made and we restricted the study to grades 3, 6 and 9. The method used to analyse the IEPs was content analysis. Using different theories within the field of special education and disability studies, we have tried to discern to what extent the problems described, and the proposed measures (intervention), are related to predetermined theoretical models of disability and special needs education. Our analysis indicates that difficulties are predominantly attributed to the pupils' shortcomings and individual characteristics, and the same holds for the recommended measures. Another interesting finding is that a number of the plans were established without involving the parents, and many of them did not even know that their child had an IEP. Finally, we discuss our findings in relation to different research traditions within the field of special education.     

The Psychological Basis for the Identification of Physical Environmental Parameters in the Development of Early Cognitive Competence1,2

Abstract:Ulvund, S. E. 1981. The Psychological Basis for the Identification of Physical Environmental Parameters in the Development of Early Cognitive Competence. Scandinavian Journal of Educational Research 25,125‐140. A theoretical analysis focussing on the identification of physical environmental parameters in the development of early cognitive competence is presented. Referring to cognitive competence as a collective term of cognitive behavior as considered by Piaget (1952) and Hunt (1965), a theoretical frame of reference based on Brunswik's (1955) unit and Wohlwill's (1973) conceptions of the environment as a source of stimulation versus the environment as a context for behavior, is discussed. It is further suggested that different variants of the optimal stimulation hypothesis, combined with a transactional model of development (Sameroff, 1975a), form a highly relevant psychological basis for the identification of physical environmental parameters. Some implications for coming research are suggested.     

Reconciliation—a rhetorical concept/ion

What is reconciliation? A source of historical puzzlement and contemporary controversy over how to make history, this question asks after those words which constitute a beginning (again), that moment in which endless cycles of conflict give way to the hope for “unity in difference.” Concerned with the dynamics of its operation, the present essay contends that reconciliation is a rhetorical concept, a performance and norm of rhetorical practice that transcends violence less than it turns its historical justification toward mutual oppositions that call for(th) the character (ethos) of understanding. A challenge to both the logic and politics of identity, an opposing and relating of that which is held to be exclusive, reconciliation is thus difficult to define. From a reading of the concept's history, I investigate this definitional puzzle through consideration of how the substance of reconciliation appears within its potential, the capacity to open a time for expression, invent the grounds for speech-action, and abide in the risks that attend the power to name. To make new in relation, reconciliation's promise demands significant faith in the works of words.     

Resources In Review

Abstract

The RFF Reader in Environmental Science and Resource Management , edited by Wallace E. Oates. Washington, DC: Resources for the Future. 1999. Paperback. $22.95. ISBN 0-915707-96-9.

Science through Multiple Intelligences: Patterns that Inspire Inquiry , by Robert Barkman. Tucson, AZ: Zephyr Press, Inc. 1999. Paperback. 165 pages. $39.00. ISBN 1-56976-096-9.

Earth Report 2000: Revisiting the True State of the Planet , edited by Ronald Bailey. New York: McGraw-Hill. 2000. Paperback. 362 pages. $19.95. ISBN 0-07-134260-5.

Hard Green: Saving the Environment from the Environmentalists (A Conservative Manifesto) , by Peter Huber. New York: Basic Books. 1999. Hardcover. $25.00. ISBN 0-468-03112-9.

Song of the Meadowlark , by James Eggert. Berkeley, CA: Ten Speed Press. 1999. Paperback. 145 pages. $12.95. ISBN 1-58008-034-0.

The Greening of Planet Earth: The Effects of Carbon Dioxide on the Biosphere , Greening Earth Society, 4301 Wilson Blvd., Suite 805, Arlington, VA 22203-4193; tel. 703-907-6168; fax 703-907-6161; info@greeningearthsociety.org. 1992. Color. 27 min 50 s. $15.00.

The Greening of Planet Earth Continues: The Promise for the 21st Century & Beyond , Greening Earth Society. 1998. Color. 27 min 30 s. $15.00 (or both for $25.00).

Nature's Nation: An Environmental History of the United States , by John Opie. New York: Harcourt Brace and Company. 1998. Paperback. 515 pages. ISBN 0-15-500219-8.

Visions of Paradise: Glimpses of Our Landscape's Legacy , by John Warfield Simpson. Berkeley: University of California Press. 1999. Clothbound. 387 pages. $35.00. ISBN 0-520-21364-5.

Beyond the Land Ethic: More Essays in Environmental Philosophy , by J. Baird Callicott. Albany: State University of New York Press. 1999. Paperback. 427 pp. $24.95. ISBN 0-7914-4084-2.

The Morning After Earth Day , by Mary Graham. Washington, DC: Brookings Institution Press. 1999. Hardcover, 153 pages. ISBN 0-8157-3236-8.

Natural Resource Management and Institutional Change , by Diana Carney and John Farrington. New York: Routledge. 1998. Hardback. 120 pages. $60.00. ISBN 0-415-18604-8.

Green Ink: An Introduction to Environmental Journalism , by Michael Frome. Salt Lake City: University of Utah Press. 1998. Paperback. 204 pages. $19.95. ISBN 0-87480-582-1.     

Media Effectiveness in a Malaysian Park System

Abstract

The effectiveness of three media formats (guides, booklets, and signs) were compared for use on a nature trail at Kinabalu Park, Malaysia. Based on a multiple-choice, cognitive test taken by 1,194 visitors, the guide treatment scores were significantly higher than the other media treatments. There was no difference between booklet and sign treatments, and all the media treatments scored higher than the control group (F _3,1190 = 173.76, α = .05). A second experiment compared only booklet and sign media. There was still no difference in effectiveness (Paired t test, t = 0.22, df = 566, p □ .05). The first language and educational backgrounds of visitors influenced media effectiveness. However, age, sex, residence, interest level, prior knowledge, and prior park visitation did not influence the relatively great effectiveness of the guide treatment. Other factors, such as cost, time, and numbers served, may justify use of media formats other than guides.     

Interpreting differences between the United States and New Zealand university students’ engagement scores as measured by the NSSE and AUSSE

Press releases concerning the Australasian Survey of Student Engagement (AUSSE) results warn that university students in Australia and New Zealand are less engaged than their peers at United States institutions. Such warnings about student engagement and interactions then become targets for improvement on Australasian universities’ strategic plans. In considering New Zealand university students’ survey responses, we examined AUSSE and the US National Survey of Student Engagement (NSSE) data for 2009 and 2010 with respect to all items that load on the five scales these instruments share. We argue that most of the observed differences in responses, response distributions and subsequent scale scores can be attributed to differences in educational pathways and cultures between the USA and New Zealand. Consequently, considerable caution in these trans-Pacific comparisons is warranted, particularly when formulating policy and practices to improve student engagement in New Zealand based on methods that have been employed in different educational contexts.