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   

Kinematic analyses of seated throwing activities with and without an assistive pole     

Brendan Burkett  Mark Connick  Mark Sayers  Luke Hogarth  Tom Stevens  Mike Hurkx  Sean Tweedy 《Sports Engineering》2017,20(2):163-170

In Paralympic seated throwing events, the athlete can throw with and without an assistive pole. This study aimed to identify and compare performance-related kinematic variables associated with both seated throwing techniques. Twenty-nine non-disabled males (21.9 ± 2.6 years) performed 12 maximal throws using a 1-kg ball in two conditions (no-pole and pole). Automatic 3D-kinematic tracking (150 Hz) and temporal data were acquired. There was no significant difference between ball speeds at the point of release between conditions (no-pole = 12.8 ± 1.6 m/s vs. pole = 12.9 ± 1.5 m/s). There were four kinematic variables that were strongly correlated with ball speed when throwing with or without an assistive pole. These variables were elbow flexion at the start phase (pole r = .39 and no-pole r = .41), maximum shoulder external rotation angular velocity during the arm cocking phase (pole r = .42), maximum shoulder internal rotation angular velocity during the arm acceleration phase (pole r = .47), and should internal rotation angular velocity at the instant of ball release (pole r = .40). The pole clearly influenced the throwing technique with all four strongly correlated variables identified in this condition, compared to only one during the no-pole condition. When using the pole, participants produced significantly higher shoulder internal rotation angular velocities during the arm acceleration phase (pole = 367 ± 183°/s vs. no-pole = 275 ± 178°/s, p < .05) and at the instant of ball release (pole = 355 ± 115°/s vs. no-pole = 264 ± 120°/s, p < .05), compared to throwing without the pole. These findings have implications for the development of evidence-based classification systems in Paralympic seated throwing, and facilitate research that investigates the impact of impairment on seated throwing performance.  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   

Comparison of Knowledge and Attitudes Using Computer-based and Face-to-Face Personal Hygiene Training Methods in Food Processing Facilities   总被引：1，自引：1，他引：0  

Ginger D. Fenton  Luke F. LaBorde  Rama B. Radhakrishna  J. Lynne Brown  Catherine N. Cutter 《Journal of Food Science Education》2006,5(3):45-50

ABSTRACT:  Computer-based training is increasingly favored by food companies for training workers due to convenience, self-pacing ability, and ease of use. The objectives of this study were to determine if personal hygiene training, offered through a computer-based method, is as effective as a face-to-face method in knowledge acquisition and improved attitude toward food safety. Employees from four food processing facilities ( n = 94) were randomly assigned to a control group, a face-to-face training group, or a computer-based training group. Evaluation instruments consisted of a pretest and a posttest to measure knowledge gain, a step scale to measure attitude after training and retrospectively before training, and a brief set of interview questions. Results for both treatments and the control group indicated increases in knowledge. Analysis of the posttest scores, when controlling for the pretest scores, indicated the difference was significant ( P ≤ 0.05); however, post hoc analysis did not indicate which treatment was superior. There was a significant increase in attitude scores for both groups using paired t -tests, although the difference between groups was not significant when controlling for attitude scores before training. Issues that may limit application of the technology used in this study include low literacy and language barriers among employees, and time constraints within companies. These and other variables should be taken into account in future research studies addressing comparisons of training methods. This study is the first to demonstrate the effectiveness of computer-based training aimed at food handlers who work in food processing establishments.  相似文献   

Education, Environment and Sustainability: what are the issues, where to intervene, what must be done?   总被引：2，自引：0，他引：2  

Timothy W.  Luke 《Educational Philosophy and Theory》2001,33(2):187-202

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Capital and Knowledge Flows: Global higher education markets     

Carmen Luke 《Asia Pacific Journal of Education》2005,25(2):159-174

Accelerating global flows of people and information have formed new communities and networks across social and political borders. Higher education is one such globalised knowledge community in which new patterns of knowledge, accreditation, research alliances, and social and professional relationships are emerging. In this paper I outline the push–pull dynamics of globalisation in higher education: the co-constitutive nature of local and global interests and educational formations; disjunctive flows of capital, information, people, and knowledge; and the new politics of knowledge capital as they affect academic research and the public archive of scholarly publishing and university libraries. I close with reflections on the differential consequences of globalisation on: the role of the nation state in higher education provision and reform; the role of education in nation building and national identity politics; and the governability of a global eduscape.  相似文献