Localized removal of layers of metal,polymer, or biomaterial by ultrasound cavitation bubbles

We present an ultrasonic device with the ability to locally remove deposited layers from a glass slide in a controlled and rapid manner. The cleaning takes place as the result of cavitating bubbles near the deposited layers and not due to acoustic streaming. The bubbles are ejected from air-filled cavities micromachined in a silicon surface, which, when vibrated ultrasonically at a frequency of 200 kHz, generate a stream of bubbles that travel to the layer deposited on an opposing glass slide. Depending on the pressure amplitude, the bubble clouds ejected from the micropits attain different shapes as a result of complex bubble interaction forces, leading to distinct shapes of the cleaned areas. We have determined the removal rates for several inorganic and organic materials and obtained an improved efficiency in cleaning when compared to conventional cleaning equipment. We also provide values of the force the bubbles are able to exert on an atomic force microscope tip.     

Are they ready to teach? Student teachers’ readiness for the job with reference to teacher competence frameworks

This is the first report in a series of studies concerning student teachers’ readiness-for-the-job, defined by a framework of 11 international teacher competences (ITCs). Attaining readiness-for-the-job is connected to four characteristics of teacher education, namely; (1) employing the ITCs in day-to-day teaching in initial teacher education, (2) integrating the ITCs in the curricula of teaching programmes, (3) exercising the ITCs through practicum at schools and (4) by teacher educators modelling the ITCs. In the present study, a student sample from four teacher education colleges (n = 226) was surveyed to explore the extent to which students felt ready-for-the-job. The study outlines the degree to which the characteristics of teacher education are associated with student teachers’ readiness-for-the-job. The results identify the critical areas to be developed in these prospective teachers before they can actually become ready-for-the-job, and especially the central role of their teacher educators in shaping their professional competence.     

Implicit sequence learning is preserved in dyslexic children

This study investigates the implicit sequence learning abilities of dyslexic children using an artificial grammar learning task with an extended exposure period. Twenty children with developmental dyslexia participated in the study and were matched with two control groups—one matched for age and other for reading skills. During 3 days, all participants performed an acquisition task, where they were exposed to colored geometrical forms sequences with an underlying grammatical structure. On the last day, after the acquisition task, participants were tested in a grammaticality classification task. Implicit sequence learning was present in dyslexic children, as well as in both control groups, and no differences between groups were observed. These results suggest that implicit learning deficits per se cannot explain the characteristic reading difficulties of the dyslexics.     

Social pressure for religious conformity and anti-gay sentiment among Muslim and Christian youth

Abstract

Research on civic education, for the most part, investigates the alleged outcomes of deliberate civic education programs. Remarkably, few types of research have investigated how the outcomes of group process (e.g. based on religion) in schools, and more specifically, the pressure to conform to in-group norms, relate to civic educational goals (e.g. promoting tolerance for Lesbian, Gay, Bisexual, Transgender people). Against that background, this paper has two objectives. First, we assess social variation in perceived social pressure for religious conformity among Christian and Muslim Youth enrolled in secondary education in Flanders (N?=?2765). Second, we investigate the relationship between perceived social pressure for religious conformity and anti-gay sentiment. Our analyses are guided by social identity theory and rely on multilevel analysis. We find that for both Christian and Muslim youth, anti-gay sentiment is higher among young people who experience higher social pressure through the perceived expectations from talking with significant others about religion.     

Techno-optimism and policy-pessimism in the public sector big data debate

Despite great potential, high hopes and big promises, the actual impact of big data on the public sector is not always as transformative as the literature would suggest. In this paper, we ascribe this predicament to an overly strong emphasis the current literature places on technical-rational factors at the expense of political decision-making factors. We express these two different emphases as two archetypical narratives and use those to illustrate that some political decision-making factors should be taken seriously by critiquing some of the core ‘techno-optimist’ tenets from a more ‘policy-pessimist’ angle. In the conclusion we have these two narratives meet ‘eye-to-eye’, facilitating a more systematized interrogation of big data promises and shortcomings in further research, paying appropriate attention to both technical-rational and political decision-making factors. We finish by offering a realist rejoinder of these two narratives, allowing for more context-specific scrutiny and balancing both technical-rational and political decision-making concerns, resulting in more realistic expectations about using big data for policymaking in practice.     

The educational trajectory of Newly Arrived Migrant Students: Insights from a structural analysis of cultural capital

ABSTRACT

Background: The recent influx of Newly Arrived Migrant Students (NAMS) in Western-European societies poses important educational questions about how best to support migrant students within the education system.

Purpose: We sought to study how elements that are associated with cultural capital – namely a sense of entitlement and strategic knowledge – have relevance to NAMS’ educational trajectories. In studying the process of how cultural capital relates to educational careers, this study argues for a general shift from a resource-focused approach towards a strategy-focused approach to cultural capital.

Sample: We collected data from 33 NAMS from six secondary schools in a city in Flanders (the Dutch-speaking part of Belgium). A maximum difference approach was used: this allowed comparison of NAMS who followed the most academic track (general track) and the least academic track (vocational track) in secondary education in Flanders.

Design and methods: We undertook 33 in-depth biographical interviews during which the NAMS reconstructed their educational trajectories. Data were analysed qualitatively. We used structural approach analysis to identify each narrative’s core structure. These structured fragments were then thematically coded.

Results: Within the categories ‘a sense of entitlement’ and ‘strategic knowledge of the education system’, the analysis detected differences in strategies of action between pupils in the general track and in the vocational track.

Conclusion: The findings offer insights that could support the development of better strategies to guide and support NAMS in education. As NAMS’ integration in the educational system appears to be a stretched and slow process of orientation, studying their trajectory has the potential to deepen our understanding of known mechanisms of the reproduction of inequalities in education.     

Designing the Internet of Things for learning environmentally responsible behaviour

We present two designs in the area of the Internet of Things, utilizing the ontology-driven Smart Objects For Intelligent Applications (SOFIA) Interoperability Platform (IOP). The IOP connects domestic objects in the physical world to the information world, allowing for coaching the behaviour of, or raising awareness in, domestic energy consumption. The concept and architecture of the SOFIA IOP is introduced, in which the domestic objects are knowledge processors connected to a semantic information broker. This broker, using a blackboard design pattern, ontologies, and semantic web technologies, enables interoperability among both digital and physical entities. The two designs based on the SOFIA IOP are presented as examples for coaching with and learning from the Internet of Things. Although both designs are in the area of domestic energy consumption, they can be seen as good starting points towards broader areas of ubiquitous learning enabled by the Internet of Things.     

Practical considerations informing teachers’ technology integration decisions: the case of tablet PCs

The unique characteristics of tablet PCs promise important benefits for education. Yet, little is known about the rationale underlying teachers’ decisions concerning their educational uses within the constraints of daily classroom practice. The current multiple case study investigated the practical considerations informing nine secondary school teachers’ decision-making processes regarding the use of tablet PCs. Stimulated recall interviews revealed 10 criteria underpinning teachers’ instructional decisions. Four criteria influenced the degree of congruence with teachers’ previous practices: familiarity, alignment with course content, opportunities to achieve (new) instructional goals efficiently, and compatibility with established pedagogical beliefs. Costs and benefits of tablet PCs were determined in terms of educational added value, lesson preparation requirements and potential disruptions to the learning environment. Finally, access to a solid technology infrastructure, supportive school policies and knowledge of how to effectively integrate tablet PCs with course content were identified as important pre-conditions for sustainable implementation. Overall, the results suggest that practical concerns constitute a critical element in teachers’ decision making, influencing not only teachers’ intention to adopt tablet PCs, but also the ways in which they use this technology to support instruction.