Hybrid capillary-inserted microfluidic device for sheathless particle focusing and separation in viscoelastic flow

A novel microfluidic device which consists of two stages for particle focusing and separation using a viscoelastic fluid has been developed. A circular capillary tube was used for three-dimensional particle pre-alignment before the separation process, which was inserted in a polydimethylsiloxane microchannel. Particles with diameters of 5 and 10 μm were focused at the centerline in the capillary tube, and the location of particles was initialized at the first bifurcation. Then, 5 and 10 μm particles were successfully separated in the expansion region based on size-dependent lateral migration, with ∼99% separation efficiency. The proposed device was further applied to separation of MCF-7 cells from leukocytes. Based on the cell size distribution, an approximate size cutoff for separation was determined to be 16 μm. At 200 μl/min, 94% of MCF-7 cells were separated with the purity of ∼97%. According to the trypan blue exclusion assay, high viability (∼90%) could be achieved for the separated MCF-7 cells. The use of a commercially available capillary tube enables the device to be highly versatile in dealing with particles in a wide size range by using capillary tubes with different inner diameters.     

Voice over distance: a case of podcasting for learning in online teacher education

This paper reports on a case study of an online pre-service teacher education course in a New Zealand university aimed at exploring the potential of student-generated podcasts as a form of interactive formative assessment at a distance. The study was part of a wider two-year funded project with the overall goal of documenting, developing, and disseminating effective and innovative e-learning practice. Findings from lecturer and tutor interviews, student focus group (FG) discussion, and course evaluations indicate that the podcasting task provided opportunities for the course lecturer, tutors, and students to learn and share ideas with one another. The experience empowered students to develop the skills and confidence to initiate more independent inquiry into technologies to support their pedagogical purposes. The study contributes to a better understanding of the skills, dispositions, and knowledge needed to prepare teacher candidates for teaching-learning contexts where information and communication technologies are increasingly pivotal.     

The Relationship Between Psychopathology and Shame in Secondary School Students

This study investigated the relationship between psychopathology and shame. Three hundred and thirty-one Secondary 2 students from Singapore participated in the study. All students completed a self-report questionnaire consisting of the Anxiety and Depression scales of the Behavior Assessment System for Children (BASC), the short version of the Aggression Questionnaire (AQ), and the Internalized Shame Scale (ISS). As predicted, students in the comorbid group at-risk for anxiety, depression and aggression, had significantly higher shame scores compared with at-risk students in all the other three single-disordered groups (anxiety-only, depression-only, or aggression-only) as well as students in the control group. Also, as expected, the control group scored significantly lower compared to all other single-disorder groups and the comorbid group. Implications of these findings with regard to comorbidity of psychopathology and its relationship to shame, classroom interventions, as well as implications pertaining to teachers' and counsellors' work with at-risk students will be discussed.     

Diaspora as method: Inter-Asia Cultural Studies and the Asian Australian Studies Research Network

ABSTRACT

What is the place of the diasporas within the Inter-Asia Cultural Studies movement, and how can Asian diasporas in the West contribute to Inter-Asia's intellectual project of “problematising Asia”? Developing a notion of diaspora as method, this essay highlights the complementary relationship between the Asian Australian Studies Research Network and the Inter-Asia Cultural Studies network. It argues that the Inter-Asia network has much to gain from embracing the Asian Australian diaspora as an interlocutor with shared priorities and concerns, and that Asian Australian studies can also productively learn from Inter-Asia's alternative model of institutionalisation, thereby expanding its theoretical and methodological frames of reference.     

A Problem-based Approach to Learning Economics: An Experiment in Progress at the Ngee Ann Polytechnic

Employers want workers with the skills of life-long learning and problem-solving. Recent efforts emphasize the value of having learning skills embedded within the total curriculum. The problem-based approach to learning has been found to encourage the development of these skills in students as well as to foster in them a deep (as opposed to the surface) approach to learning. The problem bared approach is also seen to foster confidence and initiative, and in some instances the development of teamwork and communication skills. This paper briefly describes the problem-based approach and the attempt currently being made to introduce the approach to business studies students at Ngee Ann Polytechnic in the context of an Economics course. Preliminary results indicate that students had been stimulated to show initiative, and that a large majority found self-learning, communication skills to be a major benefit of the course.     

Education for Sustainable Development in Ethnic Autonomous Areas of China: A Comparison of Two Curriculum Initiatives and Their Educational Implications

This paper examines the educational implications of two curriculum initiatives in China that have produced curricular materials promoting education for sustainable development (ESD) in minority-populated ethnic autonomous areas in China. The two curriculum projects present distinctive discourses, conceptions, models, frameworks and scopes of ESD in the country. Nonetheless, there is a likelihood that the actual implementation of the curriculum initiatives, especially the enactment of the curriculum materials produced, might be thwarted due to structural and systemic educational constraints, an anthropocentric approach to sustainable development, poor teacher support and teacher training, omissions of the affective learning components in curricular contents, as well as loopholes and weaknesses in the development of the curriculum materials themselves.     

Patriotism and National Education: Perceptions of trainee teachers in Singapore

The effective teaching of national education requires from the teacher a sense of commitment and personal conviction. The teacher has to demonstrate confidence in what is said and taught in class and, more importantly, through his or her personal values and convictions. In other words, the teacher is required to be patriotic. This paper examines the different types of patriotism among trainee teachers in Singapore, and how these types of patriotism influence their perceptions of citizenship values, the importance of national education, and the extent to which national education is viewed as government propaganda. The results revealed four homogenous clusters that differed significantly in terms of their perceptions.     

Good and Poor Sources of Educational Aid: A Five-Nation Study

Good and Poor Sources of Educational Aid: A Five-Nation Study College students in five nations (Indonesia, Malaysia, Japan, Australia, the U.S.) were asked their opinions about which nation would be the best and which the poorest source of aid for 10 hypothetical educational-development projects in the Indonesian province of North Sumatra. For the 10 projects as a whole, the majority of respondents in each of the five countries chose an industrialized, formerly colonialist nation as the best source of aid in preference to the two developing nations, Indonesia and Malaysia. Of the three industrialized nations, the United States was selected considerably more often than the second choice, Japan; and Australia was a distant third.     

Accountability through access,authenticity and advocacy when researching with young children

ABSTRACT

Research with children involving their use of digital and mobile technologies either as a methodological tool or in relation to their learning foregrounds emerging ethical issues and practices. This paper explores some of the ethical and practical challenges we faced in studies involving the recruitment of young children as research participants, and where the integrity of these research collaborations was critical. We propose an ethical framework to foreground these challenges that is shaped by a view of children as social actors and experts on their own lives, information and communication technologies as ubiquitous in children’s lives, and ethics as a situated and multifaceted responsibility. This framework has three aspects: access, authenticity and advocacy. We draw on examples from different research projects and use ethically important moments to illustrate how notions of access, authenticity and advocacy can foreground the ethical challenges in teaching–learning research contexts to better consider and offer children greater agency in research collaborations.     

Assessment of the phase synchronization effect in modal testing during operation

The impact-synchronous modal analysis (ISMA), which uses impact-synchronous time averaging (ISTA), allows modal testing to be performed during operation. ISTA is effective in filtering out the non-synchronous cyclic load component, its harmonics, and noises. However, it was found that at operating speeds that coincide with the natural modes, ISMA would require a high number of impacts to determine the dynamic characteristics of the system. This finding has subsequently reduced the effectiveness and practicality of ISMA. Preservation of signatures during ISTA depends on the consistency of their phase angles on every time block but not necessarily on their frequencies. Thus, the effect of phase angles with respect to impact is seen to be a very important parameter when performing ISMA on structures with dominant periodic responses due to cyclic load and ambient excitation. The responses from unaccounted forces that contain even the same frequency as that contained in the response due to impact are diminished with the least number of impacts when the phase of the periodic responses is not consistent with the impact signature for every impact applied. The assessment showed that a small number of averages are sufficient to eliminate the non-synchronous components with 98.48% improvement on simulation and 95.22% improvement on experimental modal testing when the phase angles with respect to impact are not consistent for every impact applied.