Parental assessment of peer play: Development and validation of the parent version of the Penn Interactive Peer Play Scale

The purpose of this investigation was to evaluate the construct validity of the parent version of the Penn Interactive Peer Play Scale (PIPPS) and to compare it with the teacher version. PIPPS were collected on 297 urban Head Start children. The Parent PIPPS replicated the three-factor solution found with the teacher version, supporting the following constructs of peer play: Play Interaction, Play Disruption, and Play Disconnection. Factor matching and canonical correlational analyses examining the relationship between the parent and teacher versions of the PIPPS revealed significant one-to-one matches between hypothesized like factors. Additionally, analyses of overlapping variance between versions indicated a significant degree of overlap. Implications of the findings for involvement of parents in the assessment process and research on the continuity and discontinuity between home and school environments for low-income, urban children were discussed.     

青年爱因斯坦:诗与真爱因斯坦奇迹年百年纪念

放肆无礼万岁!它是我在这个世界上的守护神. 　　爱因斯坦致米列娃·马里奇,1901年12月12日[1] 　　我寻求孤独,随后又在孤独中默默忧伤. 　　爱因斯坦致“妈妈“温特勒,1897年5月21日[2] 　　……     

A Comparative Study or Western and Japanese Practices Geared Towards Improved Learning and New Product Performance

Increasingly, the long‐term success of a company resides in its ability to develop and market successful new products in a cost‐and time‐effective manner. In general, Japanese companies have outperformed their Western counterparts in bringing new products to market over the last 10 to 20 years. This has given them a substantial advantage in long‐term economic development. The authors hypothesize that the differences between the dominant models of corporate culture in Japan and the U.S. account for the Japanese advantage. In comparison to U.S. companies, Japanese companies tend to emphasize long‐term leadership, decentralized decision making, a flatter work structure using cross‐functional work teams, and rewarding teams for the ability to learn from mistakes. As a result of these differences, Western companies are more likely to utilize “single, loop” learning, where new products are developed using established (and unquestioned) procedures. Conversely, Japanese companies rely on “double‐loop” or “deutero” learning styles, which encourage employees to leverage their past experiences when proposing new product innovations. The authors conclude by outlining a research program for testing their as‐gumptions about the relations among nationality, corporate culture, learning styles, and new product success.     

Dynamic mental models in learning science: The importance of constructing derivational linkages among models

We present a theory of learning in science based on students deriving conceptual linkages among multiple models which represent physical phenomena at different levels of abstraction. The models vary in the primitive objects and interactions they incorporate and in the reasoning processes that are used in running them. Students derive linkages among models by running a model (embodied in an interactive computer simulation) and reflecting on its emergent behaviors. The emergent properties they identify in turn become the primitive elements of the more abstract, derived model. We describe and illustrate derivational links among three models for basic electricity: a particle model, an aggregate model, and an algebraic model. We then present results of an instructional experiment in which we compared high school students who were exposed to these model derivations with those who were not. In all other respects, both groups of students received identical instruction. The results demonstrate the importance of enabling students to construct derivational linkages among models, both with respect to their understanding of circuit theory and their ability to solve qualitative and quantitative circuit problems. © 1999 John Wiley & Sons, Inc. J Res Sci Teach 36: 806–836, 1999     

A Proposal for State,Income-Targeted,Preschool Vouchers

This article proposes that states create low-income targeted voucher programs for 3- and/or 4-year-olds. The basis for this proposal is considerable research demonstrating long-term effects for a number of random assignment and quasi-experimental preschool programs. Benefit–costs rates of return for these programs are between $2 and $16 for every dollar invested. These results are also consistent with developmental and neuro-biological studies supporting early childhood interventions. Other research shows that low-income students are less likely to be in preschool, and if they are, they are more likely to receive low-quality services. Taken together, and to control costs, I propose an income-targeted program. I argue for vouchers based on improved equal opportunity and higher efficiency in the delivery of preschool services. Design details are generally to be the province of state decision makers. My one caveat is that it seems to make sense to require programs, at least for 4-year-olds, to be center based.     

Considerations for the use of functional principal components analysis in sports biomechanics: examples from on-water rowing

The proliferation of new biomechanical technology in laboratory and field settings facilitates the capture of data-sets consisting of complex time-series. An understanding of the appropriate statistical approaches for analysing and interpreting these data-sets is required and the functional data analysis (FDA) family of statistical techniques has emerged in the biomechanical literature. Given the use of FDA is currently in its infancy with biomechanical data, this paper will form the first of a two part series aiming to address practical issues surrounding the application of FDA techniques in biomechanics. This work focuses on functional principal components analysis (fPCA), which is explored using existing literature and sample data from an on-water rowing database. In particular methodological considerations for the implementation of fPCA such as temporal normalisation of data, removal of unwanted forms of variation in a data-set and documented methods for preserving the original temporal properties within a set of curves are explored in detail as a part of this review. Limitations and strengths of the technique are outlined and recommendations are provided to encourage the appropriate use of fPCA within the field of applied sports biomechanics.     

Sprint running kinematics and kinetics in pre-peak-height-velocity male children on a non-motorised treadmill: reliability and normative data

The purpose of this study was to quantify the reliability of kinematic and kinetic variables using a sample of pre-peak-height-velocity (PHV) male athletes sprinting on a non-motorised treadmill. Following variables were measured and their normative data presented, average and peak velocity, average and peak power, average and peak horizontal force, average and peak vertical force, average step frequency, average step length, average work. Twenty-five participants performed three 5-s all-out sprints from a standing split start on a non-motorised treadmill on three separate occasions. Per cent change in the means (-3.66 to 3.35%) and coefficients of variation (0.56–7.81%) were thought reliable for all variables. However, average step rate, average horizontal force and average vertical force did not meet the standards (≥0.70) set for acceptable intraclass correlation coefficients (ICC). Due to the homogeneous group, it was expected to receive low ICC values. Therefore, youth sprinting performance can be tested reliably on a non-motorised treadmill, especially if the per cent change in the mean and CV are deemed the important reliability measures. Normative data are given for the participant’s age as well as their maturity level for kinematic and kinetic variables.     

Making journals accessible to the visually impaired: the future is near

The American Physical Society (APS) has been a leader in using markup languages for publishing. ViewPlus has led development of innovative technologies for graphical information accessibility by people with print disabilities. APS, ViewPlus, and other collaborators in the Enhanced Reading Project are working together to develop the necessary technology and infrastructure for APS to publish its journals in the DAISY (Digital Accessible Information SYstem) eXtended Markup Language (XML) format, in which all text, math, and figures would be accessible to people who are blind or have other print disabilities. The first APS DAISY XML publications are targeted for late 2010.     

Survey of reader preferences concerning the format of NASA langley-authored technical reports

The U.S. government technical report is a primary means by which the results of federally funded research and development (R&D) are transferred to the U.S. aerospace industry. However, little is known about this information product in terms of its actual use, importance, and value in the transfer of federally funded R&D. Little is also known about the intermediary-based system that is used to transfer the results of federally funded R&D to the U.S. aerospace industry. To help establish a body of knowledge, the U.S. government technical report is being investigated as part of the NASA/DoD Aerospace Knowledge Diffusion Research Project. In this article, we summarize the literature on the U.S. government technical report and present the results of a survey of U.S. aerospace engineers and scientists that solicited their opinions concerning the format of NASA Langley Research Center (LaRC)-authored technical reports. To learn more about the preferences of U.S. aerospace engineers and scientists concerning the format of NASA LaRC-authored technical reports, we surveyed 133 report producers (i.e., authors) and 137 report users in March–April 1996. Questions covered such topics as: (a) the order in which report components are read; (b) components used to determine if a report would be read; (c) those components that could be deleted; (d) the placement of such components as the symbols list; (e) the desirability of a table of contents; (f) the format of reference citations; (g) column layout and right margin treatment; and (h) writing style in terms of person and voice. Mail (self-reported) surveys were used to collect the data. The response rates for report producers (i.e., authors) was 68% and for users, was 62%.