Antecedents and outcomes of joint trajectories of mother-son conflict and warmth during middle childhood and adolescence     

Trentacosta CJ  Criss MM  Shaw DS  Lacourse E  Hyde LW  Dishion TJ 《Child development》2011,82(5):1676-1690

This study investigated the development of mother-son relationship quality from ages 5 to 15 in a sample of 265 low-income families. Nonparametric random effects modeling was utilized to uncover distinct and homogeneous developmental trajectories of conflict and warmth; antecedents and outcomes of the trajectory groups also were examined. Four conflict trajectory groups and 3 warmth trajectory groups were identified. Difficult temperament in early childhood discriminated both conflict and warmth trajectory group membership (TGM), and adult relationship quality in early childhood was related to warmth trajectories. In addition, conflict TGM differentiated youth antisocial behavior during adolescence, and warmth trajectories predicted adolescent peer relationship quality and youth moral disengagement. Implications for socialization processes are discussed.  相似文献   

Beyond Science: Implications of the LSIE Report for Art Museum Education     

Jessica J. Luke  Karen Knutson 《Curator: The Museum Journal》2010,53(2):229-237

Abstract The Learning Science in Informal Environments report holds great potential for creating change among those who work in the field of science education. But to what extent can it inform other sectors of the informal education world? This article explores how the LSIE report might influence research and practice in art museums. By comparing the report to a recent study in art education, the authors point out areas of overlap and divergence relative to content and skills, identity, and communities of practice. We suggest several implications for how art museums and science museums might learn from one another. A call to action is made for further research and discussion about common learning goals and outcomes for the art museum experience.  相似文献   

Reading and writing from multiple source documents in history: Effects of strategy instruction with low to average high school writers   总被引：2，自引：0，他引：2  

Susan De La Paz  Mark K. Felton 《Contemporary educational psychology》2010

This study examined the effects of historical reasoning strategy instruction on 11th-grade students. Students learned historical inquiry strategies using 20th Century American history topics ranging from the Spanish-American war to the Gulf of Tonkin incident. In addition, students learned a pre-writing strategy for composing argumentative essays related to each historical event. Results indicate that in comparison to a control group (N = 79), essays written by students who received instruction (N = 81) were longer, were rated as having significantly greater historical accuracy, were significantly more persuasive, and claims and rebuttals within each argument became more elaborated. Importantly, students in the control group read the same primary and secondary source document sets, and received feedback on written essays on the same topics.  相似文献   

Physical activities and sedentary pursuits in African American and Caucasian girls     

Dowda M  Pate RR  Felton GM  Saunders R  Ward DS  Dishman RK  Trost SG 《Research quarterly for exercise and sport》2004,75(4):352-360

The purposes of this study were to describe and compare the specific physical activity choices and sedentary pursuits of African American and Caucasian American girls. Participants were 1,124 African American and 1,068 Caucasian American eighth-grade students from 31 middle schools. The 3-Day Physical Activity Recall (3DPAR) was used to measure participation in physical activities and sedentary pursuits. The most frequently reported physical activities were walking, basketball, jogging or running, bicycling, and social dancing. Differences between groups were found in 11 physical activities and 3 sedentary pursuits. Participation rates were higher in African American girls (p < or = .001) for social dancing, basketball, watching television, and church attendance but lower in calisthenics, ballet and other dance, jogging or running, rollerblading, soccer, softball or baseball, using an exercise machine, swimming, and homework. Cultural differences of groups should be considered when planning interventions to promote physical activity.  相似文献   

Fostering comprehension of risk and causation through media case studies     

Samuel Luke Tunstall 《Teaching Statistics》2016,38(2):65-66

This paper describes a case study for introductory statistics courses that promotes critical thinking in relation to causation.  相似文献   

The London Olympics of 2012: politics,promises and legacy     

Luke Harris 《Sport in History》2017,37(4):533-535

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Surface protein gradients generated in sealed microchannels using spatially varying helium microplasma     

Pascal Wettstein  Craig Priest  Sameer A. Al-Bataineh  Robert D. Short  Paul M. Bryant  James W. Bradley  Suet P. Low  Luke Parkinson  Endre J. Szili 《Biomicrofluidics》2015,9(1)

Spatially varied surface treatment of a fluorescently labeled Bovine Serum Albumin (BSA) protein, on the walls of a closed (sealed) microchannel is achieved via a well-defined gradient in plasma intensity. The microchips comprised a microchannel positioned in-between two microelectrodes (embedded in the chip) with a variable electrode separation along the length of the channel. The channel and electrodes were 50 μm and 100 μm wide, respectively, 50 μm deep, and adjacent to the channel for a length of 18 mm. The electrode separation distance was varied linearly from 50 μm at one end of the channel to a maximum distance of 150, 300, 500, or 1000 μm to generate a gradient in helium plasma intensity. Plasma ignition was achieved at a helium flow rate of 2.5 ml/min, 8.5 kV_pk-pk, and 10 kHz. It is shown that the plasma intensity decreases with increasing electrode separation and is directly related to the residual amount of BSA left after the treatment. The plasma intensity and surface protein gradient, for the different electrode gradients studied, collapse onto master curves when plotted against electrode separation. This precise spatial control is expected to enable the surface protein gradient to be tuned for a range of applications, including high-throughput screening and cell-biomolecule-biomaterial interactions.  相似文献   

A sea of kites: pushing access to archives with progressive enhancement     

Luke Bacon 《档案与原稿》2014,42(2):151-154

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Action learning: how learning transfers from entrepreneurs to small firms     

Karen Jones  Sally A. Sambrook  Luke Pittaway  Andrew Henley  Heather Norbury 《Action Learning: Research and Practice》2014,11(2):131-166

This paper presents research with small- and medium-sized enterprise (SME) owners who have participated in a leadership development programme. The primary focus of this paper is on learning transfer and factors affecting it, arguing that entrepreneurs must engage in ‘action’ in order to ‘learn’ and that under certain conditions they may transfer learning to their firm. This paper draws on data from 19 focus groups undertaken from 2010 to 2012, involving 51 participants in the LEAD Wales programme. It considers the literatures exploring learning transfer and develops a conceptual framework, outlining four areas of focus for entrepreneurial learning. Utilising thematic analysis, it describes and evaluates what (actual facts and information) and how (techniques, styles of learning) participants transfer and what actions they take to improve the business and develop their people. This paper illustrates the complex mechanisms involved in this process and concludes that action learning is a method of facilitating entrepreneurial learning which is able to help address some of the problems of engagement, relevance and value that have been highlighted previously. This paper concludes that the efficacy of an entrepreneurial learning intervention in SMEs may depend on the effectiveness of learning transfer.  相似文献   

Systematic characterization of degas-driven flow for poly(dimethylsiloxane) microfluidic devices   总被引：1，自引：0，他引：1  

Liang DY  Tentori AM  Dimov IK  Lee LP 《Biomicrofluidics》2011,5(2):24108

Degas-driven flow is a novel phenomenon used to propel fluids in poly(dimethylsiloxane) (PDMS)-based microfluidic devices without requiring any external power. This method takes advantage of the inherently high porosity and air solubility of PDMS by removing air molecules from the bulk PDMS before initiating the flow. The dynamics of degas-driven flow are dependent on the channel and device geometries and are highly sensitive to temporal parameters. These dependencies have not been fully characterized, hindering broad use of degas-driven flow as a microfluidic pumping mechanism. Here, we characterize, for the first time, the effect of various parameters on the dynamics of degas-driven flow, including channel geometry, PDMS thickness, PDMS exposure area, vacuum degassing time, and idle time at atmospheric pressure before loading. We investigate the effect of these parameters on flow velocity as well as channel fill time for the degas-driven flow process. Using our devices, we achieved reproducible flow with a standard deviation of less than 8% for flow velocity, as well as maximum flow rates of up to 3 nL∕s and mean flow rates of approximately 1-1.5 nL∕s. Parameters such as channel surface area and PDMS chip exposure area were found to have negligible impact on degas-driven flow dynamics, whereas channel cross-sectional area, degas time, PDMS thickness, and idle time were found to have a larger impact. In addition, we develop a physical model that can predict mean flow velocities within 6% of experimental values and can be used as a tool for future design of PDMS-based microfluidic devices that utilize degas-driven flow.  相似文献