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41.
Child Development and the Social Demography of Childhood 总被引:1,自引:0,他引:1
Donald J. Hernandez 《Child development》1997,68(1):149-169
This article provides background information and a practical guide for including demographic information in developmental research. First, it portrays historic demographic trends reflecting critical ways in which the family and economic environments of children have been, and continue to be, transformed in the United States. Second, it presents current demographic statistics to provide a basis for researchers to compare their special study population to the general population of children and to formulate specific hypotheses about ways in which their result might differ for children in various demographic situations. Third, it offers an Appendix with standardized wording for a minimum set of questions needed to measure the demographic characteristics and environments of children. The Appendix provides researchers the technical capacity to collect such data, so they can develop and test hypotheses about how family and econmic environments shape child development processes and outcomes. 相似文献
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This paper addresses a neglected topic in the knowledge management literature: how the size of a network of actors affects the nature of intra-network social relations and knowledge processes. It makes a theoretical contribution to developing understanding in this area drawing on a range of literatures including practice-based perspectives on knowledge, the literature on the embeddedness of social relations, and relevant knowledge management literature. The central focus of this paper is on the relationship between network size, network density, and how these variables affect intra-network knowledge processes. It suggests that as network size increases network density is likely to decrease (as it becomes problematic for the actors in such networks to retain strong ties with a significant proportion of the network's members), which it will be suggested has significant ramifications for intra-network knowledge processes. This paper concludes by reflecting on the implications of the ideas developed for network-based forms of organizing, and innovation processes. 相似文献
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Donald L. Margolis 《Journal of The Franklin Institute》1983,316(3):261-271
Semi-active systems are those in which a passive, dissipative element (damper, friction clutch, fluid orifice) is modulated, via low power inputs, to enhance the performance of its associated dynamic system. This type of control is inherently nonlinear, thus forcing the closed-loop response of the total system to be determined numerically using a digital computer. Although, strictly speaking, the frequency response for nonlinear systems does not exist, it is typical to simulate semi-active systems with sinusoidal input and present results as frequency transmissibilities. This paper uses energy dissipation per cycle to determine an approximate frequency response of semi-active systems requiring only a calculator for numerical analysis. 相似文献
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The understanding and use of historical concepts specified in national history standards pose many challenges to students. These challenges include both the acquisition of content knowledge and the use of that knowledge in ways that require higher order thinking. All students, including adolescents with learning disabilities (LD), are expected to understand and use concepts of history to pass high-stakes assessments and to participate meaningfully in a democratic society. This article describes Content Enhancement Routines (CERs) to illustrate instructional planning, teaching, and assessing for higher order thinking with examples from an American history unit. Research on the individual components of Content Enhancement Routines will be illustrated with data from 1 of the routines. The potential use of integrated sets of materials and procedures across grade levels and content areas will be discussed. 相似文献
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Donald J. Winiecki 《Performance Improvement》2015,54(3):10-14
The consulting‐oriented field of performance improvement is ideally based on a radically empirical foundation. We are supposed to be data driven and evidence based and to derive all of our processes and all of our advice to clients from empirical evidence (which can be either qualitative or quantitative) that allows us to make clear and distinct links from cause to effect. But much of the time we are simply unable to make conclusions based solely on actual performance data that unambiguously shows us a clear path for identifying gaps and effecting changes. In such a case, what is an earnest professional to do? The answer is, tell a story and change it as you go. 相似文献
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Comparisons of the WISC-R and PPVT-R were made with 37 students (25 boys, 12 girls). Pearson product moments (r) and two-tail f-tests were employed in the data analysis. The sample ranged in age from 6-2 to 14-6, with a mean age of 10-1, and SD=2.6. There were no significant differences between the WISC-R IQs and PPVT-R standard scores. The PPVT-R did not correlate significantly with the WISC-R IQ scales. 相似文献