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351.
    
The mutual annihilation of positive and negative electricity with an accompanying radiation of the equivalent electromagnetic energy has been invoked to account for stellar heat. Electrodynamics, without further generalization, has no way of admitting such annihilation accompanied by radiation. The generalizations necessary to provide logical meaning to the process are developed and discussed.In particular, it becomes necessary to extend the law of motion of electricity applicable to an electron as a whole, so as to apply also to that which remains of the electron when part of it is destroyed.  相似文献   
352.

THE MASS AUDIENCE: REDISCOVERING THE DOMINANT MODEL by James G. Webster and Patricia F. Phalen (Mahwah, NJ: Lawrence Erlbaum Associates “Communication Series,”; 1997—$39.95/$16.50, ISBN 0–8058–2304–2 hard, 0–8058–2305–0 paper, 158 pp., references, author index, subject index)

MASS COMMUNICATIONS RESEARCH RESOURCES: AN ANNOTATED GUIDE by Christopher H. Sterling, James K. Bracken, and Susan M. Hill (Mahwah, NJ: Lawrence Erlbaum Associates, 1998—$49.95 with 40% discount for orders of 5 or more copies, ISBN 0–8058–2024–8, 208 pp., appendices, index)

MORE THAN MEETS THE EYE: AN INTRODUCTION TO MEDIA STUDIES by Graeme Burton (New York: Arnold/St. Martin's Press, 1997 [2nd ed.]— $18.95, paper, ISBN 0–340–67663–9, 240 pp)

DICTIONARY OF MEDIA LITERACY by Art Silverblatt and Ellen N. Enright Eliceiri (Westport, CT: Greenwood, 1997—$65.00, ISBN 0–313–29743–6, 248 pp., bibliography, subject directory, index)

VIOLENCE AND THE MEDIA: A REFERENCE HANDBOOK by David E. Newton (Santa Barbara, CA: ABC‐CLIO “Contemporary World Issues,”; 1996—no price available, ISBN 0–8743–6843‐X, 254 pp., statistical tables, notes, bibliography, glossary, index)

MEDIA/SOCIETY: INDUSTRIES, IMAGES, AUDIENCES by David Croteau and William Hoynes (Thousand Oaks, CA: Pine Forge Press, 1997—price not given, ISBN 0–8039–9065–0, 344 pp. with tables, bibliography and index)

JAHRESBIBLIOGRAPHIE MASSENKOMMUNIKATION 1995 / ANNUAL BIBLIOGRAPHY OF MASS COMMUNICATION: 1995 compiled by Wilbert Ubbens (Berlin: Wissenschaftsverlag Volker Spiess, 1997—DM 36, ISBN 3–89166–199–1, 436 pp.)

SEARCH STRATEGIES IN MASS COMMUNICATION by Jean Ward and Kathleen A. Hansen (White Plains, NY: Longman, 1997 [3rd ed.]— $38.95, ISBN 0–8013–1755‐X, 371 pp., bibliographies, appendixes, indexes)

A DICTIONARY OF COMMUNICATION AND MEDIA STUDIES by James Watson and Anne Hill (London and New York: Arnold, 1997 [4th ed.], distributed by St. Martin's Press—$18.95, ISBN 0–34067–635–3 paper, 251 pp., table of abbreviations, illustrations)  相似文献   
353.
Abstract In this review essay, Harvey Kantor and Robert Lowe explore the history of the culture wars in public education in the United States. Drawing on three books — David Tyack’s Seeking Common Ground, Jonathan Zimmerman’s Whose America? and Amy Binder’s Contentious Curricula— Kantor and Lowe review the history of struggles over the content of history texts and over the place of religion and religious values in the classroom. They suggest that while these struggles have been partially successful in freeing public education from the racial and ethno‐religious particularisms that informed its origins, the more inclusive curriculum that resulted from these efforts has been rendered largely symbolic by the persistence of segregation and the inequality of resources that accompanies it.  相似文献   
354.
Abstract

The purpose of this study was to determine the effects of aerobic dance on physical work capacity, cardiovascular function and body composition of young middle-aged women. Maximal oxygen uptake ([Vdot]O 2 max), heart rate during submaximal treadmill walking, resting heart rate and blood pressure, and body composition were determined before and after a 10-week aerobic dance conditioning program in 28 women (18 experimental and 10 control), aged 25 to 44 years. During the 10-week treatment period, the experimental subjects participated in 45 min of aerobic dance at 70–85% of the heart rate reserve, 3 days · week –1,whereas the control group did not participate in any regular strenuous physical activity. Changes in the experimental group were significantly greater than in the control group for [Vdot]O 2 max expressed in 1 · min –1 or relative to body weight or fat-free weight (5 to 7% vs. – 5 to – 8%), time on a continuous grade-incremented walking treadmill test (16% vs. 1%), heart rate during submaximal stages of the treadmill test (– 9% vs. 1%) and resting heart rate (– 8% vs. 2%). Resting systolic and diastolic blood pressure; body weight; percent fat, fat weight, and fat-free weight estimated using underwater weighing; sum of seven skinfolds; and sum of seven circumferences did not change significantly in either group. It was concluded that aerobic dance performed 30–45 min, 3 days · week –1 for 10 weeks significantly improves physical work capacity and cardiovascular function, but without dietary control, does not alter body composition in sedentary middle-aged women.  相似文献   
355.
356.
This paper considers two major problems related to the Identification of learning disabilities with individually administered achievement tests: the appropriateness of standard versus developmental scores for determining severity of discrepancy and the limitations of existing developmental score scales. The paper also examines the characteristics of the developmental score scales of individualized achievement tests commonly used to evaluate learning disabilities.  相似文献   
357.
358.
359.
    
According to government policy in Ireland, special needs assistants (SNAs) may be employed in post-primary schools to support students deemed to have chronic and serious care needs. There is currently no national policy regarding the continuing professional development (CPD) of SNAs, to meet the requirements of their role. This study investigated the CPD needs of SNAs, working in post-primary schools, in the Border, Midland and Western region of Ireland. Findings from a survey of SNAs and principals revealed that while the majority agreed CPD for SNAs should be compulsory, an ad hoc approach to provision of CPD prevailed, and barriers to CPD were identified. Findings also indicated that CPD in supporting students with Emotional and Behaviour Disorders was a key requirement identified by principals and SNAs. Supporting students with Autism Spectrum Disorder and promoting student independence were also identified as areas for CPD. The need for a national policy with regard to CPD for SNAs is highlighted.  相似文献   
360.
    
Decision-making is a central component of the in-game performance of Australian football umpires; however, current umpire training focuses largely on physiological development with decision-making skills development conducted via explicit lecture-style meetings with limited practice devoted to making actual decisions. Therefore, this study investigated the efficacy of a video-based training programme, aimed to provide a greater amount of contextualised visual experiences without explicit instruction, to improve decision-making skills of umpires. Australian football umpires (n = 52) were recruited from metropolitan and regional Division 1 competitions. Participants were randomly assigned to an intervention or control group and classified according to previous umpire game experience (i.e., experienced; less experienced). The intervention group completed a 12-week video-based decision-making training programme, with decision-making performance assessed at pre-training, and 1-week retention and 3-week retention periods. The control group did not complete any video-based training. Results indicated a significant Group (intervention; Control) × Test interaction (F(1, 100) = 3.98; = 0.02, partial ?2 = 0.074), with follow-up pairwise comparisons indicating significant within-group differences over time for the intervention group. In addition, decision-making performance of the less experienced umpires in the intervention group significantly improved (F(2, 40) = 5.03, P = 0.01, partial ?2 = 0.201). Thus, video-based training programmes may be a viable adjunct to current training programmes to hasten decision-making development, especially for less experienced umpires.  相似文献   
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