Lumbar spinal loads and muscle activity during a golf swing

This study estimated the lumbar spinal loads at the L4-L5 level and evaluated electromyographic (EMG) activity of right and left rectus abdominis, external and internal obliques, erector spinae, and latissimus dorsi muscles during a golf swing. Four super VHS camcorders and two force plates were used to obtain three-dimensional (3D) kinematics and kinetics of golf swings performed by five male collegiate golfers. Average EMG levels for different phases of golf swing were determined. An EMG-assisted optimization model was applied to compute the contact forces acting on the L4-L5. The results revealed a mean peak compressive load of over six times the body weight (BW) during the downswing and mean peak anterior and medial shear loads approaching 1.6 and 0.6 BW during the follow-through phases. The peak compressive load estimated in this study was high, but less than the corresponding value (over 8 BW) reported by a previous study. Average EMG levels of different muscles were the highest in the acceleration and follow-through phases, suggesting a likely link between co-contractions of paraspinal muscles and lumbar spinal loads.     

Student contribution in asynchronous online discussion: a review of the research and empirical exploration

The increasingly prevalent use of Internet in schools and homes has resulted in asynchronous online discussion becoming an increasingly common means to facilitate dialogue between instructors and students, as well as students and students beyond the boundaries of their physical classrooms. This article is organized into two main sections. In the first section, we review 50 empirical studies in order to identify the factors leading to limited student contribution. Limited student contribution is defined as students making few or no postings, or students exhibiting surface-level thinking or low-level knowledge construction in online discussions. We then identify the various empirically based guidelines to address the factors. In the second section, we discuss three potential guideline dilemmas that educators may encounter: (a) use of grades, (b) use of number of posting guideline, and (c) instructor-facilitation. These are guidelines where previous empirical research shows mixed results when they are implemented. Acknowledging the dilemmas is essential for educators and researchers to make informed decisions about the discussion guidelines they are considering implementing. Finally, we report two exploratory case studies on student-facilitation that we conducted. Using students as facilitators may be an alternative solution to educators who wish to avoid the instructor-facilitation guideline dilemma.     

Understanding Singaporean preschool teachers' beliefs about literacy development: Four different perspectives

Investigating teachers' beliefs may shed light on their activities in the classroom, and in turn, on the pedagogical process itself. It is, however, not easy to study teachers' beliefs empirically. Q-methodology has been used over several disciplines to systematically investigate individuals' points of view on a range of issues. A study involving Q-methodology was conducted in Singaporean preschools to investigate some teachers' perceptions of early literacy development and instruction. The study revealed four viewpoint groups among the 30 preschool teachers who participated in the study, and possible teacher characteristics that distinguish the viewpoints from each other. The results suggest that the differences in viewpoints are indicative of differences in cultural expectations held by various groups of teachers.     

Select Books – the struggle of an independent bookshop

Abstract

This is a first‐hand account of the initial 28 years of Select Books, an independent bookshop, located in Singapore, but with a regional Southeast Asian focus and a global reach. Select Books carved a niche for itself by specializing in books about Southeast Asia and published in Southeast Asia. Its comprehensive and in‐depth book stock gave it an edge over formidable competition at home and abroad. The author relates the difficulties encountered and the novel solutions Select Books employed to overcome administrative problems and sidestep bureaucratic red tape. Select Books operated on all levels of the book trade: as bookseller, distributor, library supplier and publisher. Equally important is its intangible role as a promoter of Southeast Asian authors and their works in Singapore as well as to the first world. Select Books provided a cultural space where authors could meet with their readership. Turning to the broader book community, the author is critical of the Eurocentric mindsets of public and academic institutions in Singapore. She is equally critical of the parochial and prejudiced international market that dismisses books about Asia as insufficiently ‘mainstream’ for their market.     

Dielectrophoretic manipulation of particles in a modified microfluidic H filter with multi-insulating blocks

The conventional microfluidic H filter is modified with multi-insulating blocks to achieve a flow-through manipulation and separation of microparticles. The device transports particles by exploiting electro-osmosis and electrophoresis, and manipulates particles by utilizing dielectrophoresis (DEP). Polydimethylsiloxane (PDMS) blocks fabricated in the main channel of the PDMS H filter induce a nonuniform electric field, which exerts a negative DEP force on the particles. The use of multi-insulating blocks not only enhances the DEP force generated, but it also increases the controllability of the motion of the particles, facilitating their manipulation and separation. Experiments were conducted to demonstrate the controlled flow direction of particles by adjusting the applied voltages and the separation of particles by size under two different input conditions, namely (i) a dc electric field mode and (ii) a combined ac and dc field mode. Numerical simulations elucidate the electrokinetic and hydrodynamic forces acting on a particle, with theoretically predicted particle trajectories in good agreement with those observed experimentally. In addition, the flow field was obtained experimentally with fluorescent tracer particles using the microparticle image velocimetry (μ-PIV) technique.     

Books,Bytes, and Buildings: The Academic Library's Unique Role in Improving Student Success

Student persistence and completion are paramount in higher education, and institutions are employing targeted programs and initiatives to address these concerns. The academic library can play an especially important role in these efforts, given its unique interdisciplinary mission and its integrated instructional programs. With a foundation in both higher education and library and information science literatures, this article describes how one academic library engaged in cross-campus programs, partnerships, and initiatives to contribute to student success efforts. Other libraries may find these examples useful as they consider how to frame their work in the context of their institutions’ student persistence efforts.