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Tunable resistive pulse sensing (TRPS) experiments have been used to quantitatively study the motion of 1 μm superparamagnetic beads in a variable magnetic field. Closed-form theory has been developed to interpret the experiments, incorporating six particle transport mechanisms which depend on particle position in and near a conical pore. For our experiments, calculations indicate that pressure-driven flow dominates electrophoresis and magnetism by a factor of ∼100 in the narrowest part of the pore, but that magnetic force should dominate further than ∼1 mm from the membrane. As expected, the observed resistive pulse rate falls as the magnet is moved closer to the pore, while the increase in pulse duration suggests that trajectories in the half space adjacent to the pore opening are important. Aggregation was not observed, consistent with the high hydrodynamic shear near the pore constriction and the high magnetization of aggregates. The theoretical approach is also used to calculate the relative importance of transport mechanisms over a range of geometries and experimental conditions extending well beyond our own experiments. TRPS is emerging as a versatile form of resistive pulse sensing, while magnetic beads are widely used in biotechnology and sensing applications. 相似文献
223.
Maria Pampaka Julian Williams Graeme Hutcheson Geoff Wake Laura Black Pauline Davis Paul Hernandez‐Martinez 《British Educational Research Journal》2012,38(3):473-496
We address the current concerns about teaching‐to‐the‐test and its association with declining dispositions towards further study of mathematics and the consequences for choice of STEM subjects at university. In particular, through a mixed study including a large survey sample of over 1000 students and their teachers, and focussed qualitative case studies, we explored the impact of ‘transmissionist’ pedagogic practices on learning outcomes. We report on the construction and validation of a scale to measure teachers’ self‐reported pedagogy. We then use this measure in combination with the students’ survey data and through regression modelling we illustrate significant associations between the pedagogic measure and students’ mathematics dispositions. Finally, we discuss the potential implications of these results for mathematics education and the STEM agenda. 相似文献
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Leigh N. Wood Glyn Mather Peter Petocz Anna Reid Johann Engelbrecht Ansie Harding Ken Houston Geoff H. Smith Gillian Perrett 《International Journal of Science and Mathematics Education》2012,10(1):99-119
We report on an international study about mathematics students’ ideas of how they will use mathematics in their future study
and careers. This builds on our previous research into students’ conceptions of mathematics. In this paper, we use data from
two groups of students studying mathematics: those who participated in an in-depth interview and those who completed an open-ended
questionnaire. We found that their responses could be grouped into four categories: don’t know; procedural skills; conceptual
skills; and professional skills. Although some students held clear ideas about the role of mathematics, many were not able
to articulate how it would be used in their future. This has implications for their approach to learning and our approach
to teaching. 相似文献
226.
Geoff Brindley 《通化师范学院学报》2005,(4)
Introduction TERMINOLOGY AND KEY CONCEPTS The term assessment refers to a variety of ways of collecting information on a learner‘ s language ability or achievement. Although testing and assessment are often used interchangeably, the latter is an umbrella term encompassing measurement instruments administered on a ‘one-off‘ basis such as tests, as well as qualitative methods of monitoring and recording student learning such as observation, simulations of project work. Assessment is also distinguished from... 相似文献
227.
Geoff Walton Mark Childs Gordana Jugo 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(3):1060-1086
The aim of the project was to motivate school students to learn about the national literature of their own and others’ countries. Engagement was fostered via the creation of digital artefacts (or “e-artefacts”) such as online comic strips, live videos or animations. The pedagogical rationale was based on Papert’s constructionism and Bloom’s revised taxonomy. Participatory action research put school teachers at the centre of the research process. School teachers from five schools (Croatia, Denmark, Poland, Sweden and the UK) chose their own pedagogical approaches for classroom activities. Data on how teachers viewed the use of e-artefacts in their classroom practice were gathered using focus groups. Teachers in all five schools identified the same process for relating texts to activities: involving a close reading of the text, collaborative formatting for the e-artefact, and points for reflection and discussion. Students and staff were not only more excited with studying the literature, learners also showed improvement in language learning. Teachers also reported that specific students showed noticeable increases in self-efficacy and classroom participation. By providing alternative means for students to excel and show competencies beyond academic capabilities, more students feel included and valued. Furthermore, the process of creating e-artefacts demanded greater reflection from students, which was a result of greater engagement with the materials. Finally, including the creation of e-artefacts in the curriculum, while maintaining more traditional approaches, offers a more inclusive and rewarding provision of learning for both students and staff. 相似文献
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Aaron C.T. Smith Bob Stewart Sunny Oliver-Bennetts Sharyn McDonald Lynley Ingerson Alastair Anderson Geoff Dickson Paul Emery Fiona Graetz 《Sport Management Review》2010,13(3):181-197
This article reports on 11 narrative-based case histories which sought to: (1) uncover the attitudes of players and athletes to drugs in sport, and (2) explore contextual factors influencing the formation of those attitudes as informed by social ecology theory. Overall, participants viewed the use of banned performance-enhancing substances as cheating, ‘hard’ non-performance-enhancing recreational or illicit substances as unwise, legal non-performance-enhancing substances as acceptable, and legal performance-enhancing substances as essential. In short, attitudes were sometimes quite libertarian, and contingent upon first, the legality of the substance, and second, its performance impact. Results also indicated that athletes’ attitudes about drugs were fundamentally shaped by sport's culture. Other significant factors included its commercial scale, closely identifiable others, early experiences and critical incidents of players and athletes, and their level of performance. 相似文献