Sport injury and illness: elite skiers describe their experiences.   总被引：1，自引：0，他引：1  

T Bianco  S Malo  T Orlick 《Research quarterly for exercise and sport》1999,70(2):157-169

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The effect of temporal and informational constraints on one-handed catching performance.     

S Bennett  K Davids  T Craig 《Research quarterly for exercise and sport》1999,70(2):206-211

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An investigation into teaching games for understanding: effects on skill, knowledge, and game play.     

A P Turner  T J Martinek 《Research quarterly for exercise and sport》1999,70(3):286-296

The purpose of this study was to test the validity of the games for understanding model by comparing it to a technique approach to instruction and a control group. The technique method focused primarily on skill instruction where the skill taught initially was incorporated into a game at the end of each lesson. The games for understanding approach emphasized developing tactical awareness and decision making in small game situations. Two physical education specialists taught field hockey using these approaches for 15 lessons (45 min each). The control group did not receive any field hockey instruction. Data were collected from 71 middle school children. Pretests and posttests were administered for hockey knowledge, skill, and game performance. Separate analyses of variance or analyses of covariance were conducted to examine group differences for cognitive and skill outcomes. The games for understanding group scored significantly higher on passing decision making than the technique and control groups during posttest game play and significantly higher than the control group for declarative and procedural knowledge. The games for understanding group scored significantly higher on control and passing execution than the other groups during posttest game play. For hockey skill, there were no significant differences among the treatment groups for accuracy, but the technique group recorded faster times than the control group on the posttest.  相似文献   

Free radical generation and lipid peroxidation among the dry cell industry workers exposed to carbon     

K. K. Reddy  T. P. K. Reddy  B. V. Somasekharaiah  K. Soorya Kumari 《Indian journal of clinical biochemistry : IJCB》1998,13(1):27-32

A total of 75 healthy male dry cell industry workers exposed to carbon for 5, 8 and 10 years were compared with 48 controls matched for age and economic status with respect to free radical generation, lipid peroxidation and antioxidant levels. Lymphocytes were seperated from the whole blood and used for estimation of free radicals and antioxidants. Plasma lipid peroxidation products were estimated in the form of thiobarbituric acid reactive substances. Significant increase in free radical generation and lipid peroxidation products were observed in carbon exposed population than controls, and the increase was found to be significant with increase in the period of exposure. The levels of antioxidants i.e., superoxide dismutase (SOD) and catalase were found to decrease with the increase in exposure to carbon in industrial workers. These results suggest that exposure to carbon augments free radical generation, lipid peroxidation and promotes decline in antioxidant enzymes.  相似文献   

Engineering understanding     

Sören Törnkvist  Jean Armstrong  Helen Armstrong 《Metascience》1998,7(3):432-442

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A study of serum lipid profile part-1: Establishment of normal reference values of serum lipid levels in healthy vegetarian population of Gujarat     

C. I. Jhala  U. V. Shah  T. K. Shah  B. K. Naik  J. D. Dafda 《Indian journal of clinical biochemistry : IJCB》1998,13(1):1-7

Fasting samples of 1329 apparently healthy vegetarian Gujarati population were tested for total cholesterol, triglycerides and three major fractions of lipoproteins, i.e. high density lipoproteins, low density lipoproteins and very low density lipoproteins. All the values showed marked increase with the age. Except for serum triglycerides, values differ in males and females in the age group of above 45 years. Compared to Northern Indian population low density lipoprotein and high density lipoprotein values were higher, but values of triglycerides and very low density lipoproteins were lower. There is no significant difference in total cholesterol values. Compared to Southern Indian population low density lipoprotein and very low density lipoprotein values were higher but values of triglycerides, total cholesterol and high density lipoprotein were lower. All serum lipid values were significantly lower than the Westem population. The range of values for both the sexes is presented for different age groups.  相似文献   

Teachers' Views about What to do about Sustainable Development     

Roger T. Cross 《Environmental Education Research》1998,4(1):41-52

In its various guises the political and economic implications of the spectrum of ideas labelled ‘sustainable development’ have been widely discussed in the media. This research engaged secondary school teachers in the debate concerning the implications for education of the concept of sustainable development. Underpinning this pilot research project is the assumption that teachers, as generally informed citizens, have been sensitised to some of the issues raised in the public domain. Teachers in both the USA and Scotland were interviewed to ascertain the extent to which they had begun to make connections between what they have heard and read informally about sustainable development and their responsibilities as teachers. The objective of this research was to determine the impact of this informal ‘environmental’ education on teaching practice.  相似文献   

浅谈市场经济下的物资设备采购     

兰富军 《河北北方学院学报(社会科学版)》1998,(Z2)

本文试图在我国市场经济初步形成、逐步完善的特定历史时期探索一种适合高等院校物资设备采购工作的新模式,更好地服务于我国的高等教育事业。  相似文献   

Simulating the Use of Disclosed Items in Computerized Adaptive Testing     

Martha L. Stocking  William C. Ward  Maria T. Potenza 《Journal of Educational Measurement》1998,35(1):48-68

Regular use of questions previously made available to the public (i.e., disclosed items) may provide one way to meet the requirement for large numbers of questions in a continuous testing environment, that is, an environment in which testing is offered at test taker convenience throughout the year rather than on a few prespecified test dates. First it must be shown that such use has effects on test scores small enough to be acceptable. In this study simulations are used to explore the use of disclosed items under a worst-case scenario which assumes that disclosed items are always answered correctly. Some item pool and test designs were identified in which the use of disclosed items produces effects on test scores that may be viewed as negligible.  相似文献   

DOMAIN DIFFERENCES IN THE EPISTEMOLOGICAL BELIEFS OF COLLEGE STUDENTS   总被引：9，自引：0，他引：9  

Paulsen  Michael B.  Wells  Charles T. 《Research in higher education》1998,39(4):365-384

This study examined the differences in the epistemological beliefs of college students across major fields of study. Beliefs in fixed ability, simple knowledge, quick learning, and certain knowledge were assessed for 290 students attending a large urban public university. Major fields of study were classified in domains of study according to the hard-soft and pure-applied dimensions of Biglan's well-known classification of academic fields. Additional analyses examined the effects of gender, age, year in college, and GPA. Results indicated that students majoring in pure fields were less likely than those in applied fields to hold naive beliefs in simple knowledge, quick learning, and certain knowledge, and students majoring in soft or pure fields were less likely than others to hold naive beliefs in certain knowledge. Gender, age, and GPA were also related to students' beliefs. The results of this study suggest that students' beliefs about the nature of knowledge and learning are related to the disciplinary contexts in which students select and experience their specialized coursework in college.  相似文献