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Bioecological systems theory provides a framework to understand how factors in the child's environment contribute to parent-child differences in estimations of how often children are helped by their Internet use. A national sample survey of 456 matched parent-child pairs investigated how parents-child relational factors, parental attitudes toward the Internet, and the bio-ecology of the child, are related to differing perceptions of the frequency of using the Internet to seek help with homework assignments, to aid in identity development, and to find health information. While previous research shows that parents underestimate risky online behaviors, we investigate whether parent-child differences will emerge in regards to how often the child engages in the behaviors under investigation here. The findings show that parents overestimate these online activities, suggesting they are biased in their estimations. Parent-child relational factors emerged as predictors of parental overestimation for each of these online activities, with trust perceptions as the most consistent predictor. Parental attitudes toward the Internet predicted parent-child differences in perceptions of how frequently the child used the Internet for help with homework and identity development, while the bioecology of the child was only predictive in the case of using the Internet for help with homework.  相似文献   
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Abstract

Nineteen college men and women (aged 18–23 yrs, × = 21.1) were studied to ascertain the force-time components of a rapid maximal voluntary isometric contraction (MVC) for ankle dorsiflexors, knee extensors, elbow flexors, wrist flexors and hand grip. Standardized isometric strength testing protocol was used. After a practice period subjects were instructed to make an MVC without jerking and as quickly as possible, for each of the muscle actions noted above. Force readings were taken from a load cell assembly through an analogue-to-digital converter and analyzed to yield time values for MVC, 3/4 MVC, 1/2 MVC, and 1/4 MVC. The results indicated significant differences (p < .01) between the responses of the men and women, with the women reaching full MVC more rapidly than the men. Also, there were significant differences among the five muscle groups tested, with the wrist flexor muscle group developing MVC most quickly, while the knee extensors took the longest time to full MVC. Based upon these data it may be concluded that the time to full MVC differs between men and women, and also that the time to full MVC differs among the five muscle groups tested in this experiment.  相似文献   
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The purpose of this study was to develop and verify the Index of Science Reading Awareness (ISRA) based on a model of an efficient, successful interactive-constructive science reader and three independent metacognitive awareness domains. Several researchers have noted the need for efficient, reliable, and valid measures of metacognition. ISRA data collected on 532 students (Grades 4–8) were analyzed using factor analyses, linear structural modeling, and analyses of variance (ANOVAs) to help verify the model and the test. The factor analyses and linear structural modeling indicated that these data did not support the assumption about the three independent metacognitive awareness domains, but suggested that the model and the test were structured around the design features of science reading, science text, and science reading strategies. One-way ANOVAs indicated significant, predicted reading ability and gender differences but unexpected grade-level differences. The composite metacognitive awareness data indicated that most Grade 4–8 students have surface knowledge about science reading, science text, and science reading strategies, and indicated specific targets for explicit science reading instruction. © 1998 John Wiley & Sons, Inc. J Res Sci Teach 35: 27-51, 1998.  相似文献   
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Student interviews provide valuable input into peer evaluation of teaching. Both the University of Georgia and Stanford University have explored ways of using student interviews to tap into student perspectives. The approaches taken by the two schools are compared in this paper. Similarities and differences are identified and discussed. In addition, the aspects of teaching that are best reflected upon by peers versus students are enumerated.Sheri D. Sheppard, an associate professor, has been at Stanford University in the Design Division of Mechanical Engineering since 1986. In addition to teaching both undergraduate and graduate design classes, she does experimental and analytical research on weld fatigue and impact failures, fracture mechanics, and applied finite element analysis. She is also a co-principal investigator with Professor Larry Leifer on a multi-university NSF funded project to critically review undergraduate engineering curricula. Before coming to Stanford, Dr. Sheppard completed her graduate studies at the University of Michigan and held several research and consultancy positions in the automotive industry. Larry Leifer received his Ph.D. in Biomedical Engineering, his M.S. in Product Design and his B.S. in Mechanical Engineering at Stanford University. He studied human information processing and biomedical engineering in laboratories in the U.S. and Europe before joining Stanford's mechanical engineering department faculty in 1976. Currently he is a professor in the design division where he teaches courses in engineering design based on industry-funded projects and distributed design teams. He studies and promotes this pedagogy through leadership in an NSF funded coalition of engineering schools which are revising undergraduate engineering curricula. Relatedly, he has developed the Smart Product Design laboratory and taught its curriculum for 10 years. As founding director of the Stanford Center for Design Research, he does design theoretic studies and objective evaluation of structured design methodology. Seeking to disseminate assistive devices for physically limited individuals, he co-founded the Tolfa Corporation (1989) and Independence Works, Inc. (1992), a product development enterprise that uses the Internet World Wide Web to bridge the technology transfer gap between research laboratories and disabled consumer markets. J. Edward Carryer is an Acting Assistant Professor in the Design Division of Mechanical Engineering at Stanford University. In addition to teaching both undergraduate and graduate courses in mechatronics, he is active in the organization of workshops on Mechatronics Education and the development of both graduate and undergraduate Mechatronics curricula. Before coming to Stanford in 1992, Dr. Carryer held positions in the automotive industry and as a consultant on mechatronic systems, including Chief Engineer at Creative Applications Engineering Inc. There his work involved projects on medical instruments, electronic engine controls and human environmental control systems. Dr. Carryer's graduate work was done at the University of Wisconsin, Madison and Stanford University.  相似文献   
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In this study, the authors empirically test a model of sport behaviour that integrates both team identification and a network theory approach to understand attendance at intercollegiate ice hockey games. Grounded within the brand community triad, ego network data were collected among attendees to measure the fan-to-fan connections that constitute the horizontal relationships of brand community participants. Additionally, a multidimensional team identification measure was used to illustrate the vertical relationship between individual and team. Both measures were included in a structural equation model to test how both fan-to-fan and fan-team relationships explain attendance. The results from the model support the salience of both dimensions of the brand community triad, suggesting that understanding sport fan behaviour necessitates including both psychological and structural elements of behaviour. Future suggestions for extending the study of sport fans through structural networks are discussed.  相似文献   
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Are student attitudes toward science-technology-society (TSS) affected by visitation to science-technology museums? The purpose of this study was to determine whether such visitations affected student STS attitudes, and in what ways particular factors of the visitation impacted these attitudes. Factors examined included prior classroom experience with STS, instructional methodology employed by teachers, grade level, socioeconomic status, school type (public or private), and gender. The subjects involved in the study were 194 Kansas students in grades 6-8, and their 13 classroom teachers. Data were collected via a pretest-posttest control group design by using study-specific questionnaires and the Moore-Sutman Scientific Attitudes Inventory. Results indicated that significant differences in attitudes were present between visiting and nonvisiting students and between grade levels. No significant differences were found between other factors. One possible conclusion is that sound pedagogy should be used prior to and during museum visitations as well as in the classroom.  相似文献   
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