The effect of textile air permeability on the drag of high-speed winter sports apparel

In a number of sport disciplines characterized by high velocities, aerodynamic performance of sports apparel is a concern. The goal is often to reduce the aerodynamic drag force and thereby increase speed. In the design of optimized competition apparel the fabric properties will be very important. One fabric property which has traditionally been considered an influencing parameter on aerodynamic performance is the air permeability. In this paper the effect of air-permeability, treated as an independent variable, upon aerodynamic drag on a bluff body is investigated. Similar multilayer textiles with internal membranes regulating air permeability were tested on cylindrical models in wind tunnel experiments in order to identify a possible relation between air-permeability and drag force. A weak dependence of flow transition on air-permeability could be found, but this could be considered to have a limited effect on the aerodynamic performance of sports garments.     

Expertise seeking: A review

Expertise seeking is the activity of selecting people as sources for consultation about an information need. This review of 72 expertise-seeking papers shows that across a range of tasks and contexts people, in particular work-group colleagues and other strong ties, are among the most frequently used sources. Studies repeatedly show the influence of the social network – of friendships and personal dislikes – on the expertise-seeking network of organisations. In addition, people are no less prominent than documentary sources, in work contexts as well as daily-life contexts. The relative influence of source quality and source accessibility on source selection varies across studies. Overall, expertise seekers appear to aim for sufficient quality, composed of reliability and relevance, while also attending to accessibility, composed of access to the source and access to the source information. Earlier claims that seekers disregard quality to minimise effort receive little support. Source selection is also affected by task-related, seeker-related, and contextual factors. For example, task complexity has been found to increase the use of information sources whereas task importance has been found to amplify the influence of quality on source selection. Finally, the reviewed studies identify a number of barriers to expertise seeking.     

Developing Students’ Reflections on the Function and Status of Mathematical Modeling in Different Scientific Practices: History as a Provider of Cases

Mathematical models and mathematical modeling play different roles in the different areas and problems in which they are used. The function and status of mathematical modeling and models in the different areas depend on the scientific practice as well as the underlying philosophical and theoretical position held by the modeler(s) and the practitioners in the extra-mathematical domain. For students to experience the significance of different scientific practices and cultures for the function and status of mathematical modeling in other sciences, students need to be placed in didactical situations where such differences are exposed and made into explicit objects of their reflections. It can be difficult to create such situations in the teaching of contemporary science in which modeling is part of the culture. In this paper we show how history can serve as a means for students to be engaged in situations in which they can experience and be challenged to reflect upon and criticize, the use of modeling and the significance of the context for the function and status of modeling and models in scientific practices. We present Nicolas Rashevsky’s model of cell division from the 1930s together with a discussion of disagreement between him and some biologists as one such episode from the past. We illustrate how a group of science students at Roskilde University, through their work with this historical case, experienced that different scientific cultures have different opinions of the value of a model as an instrument for gaining scientific knowledge; that the explanatory power of a model is linked not only to the context of its use, but also to the underlying philosophical and theoretical position held by the modeler(s) and the scientists discussing the model and its use. The episode’s potential to challenge students to reflect upon and criticize the modeling process and the function of models in an extra mathematical domain is discussed with respect to the notions of internal and external reflections.     

An Arendtian perspective on inclusive education: towards a reimagined vocabulary

Inclusive education currently appears to be undergoing a crisis and re-examination. This paper presents a new approach to thinking about inclusiveness in the school context. Many positions within inclusive education seem to take political, social and ethical perspectives as a starting point, which has allowed inclusive movements and initiatives around the world to succumb to neo-liberal policy-making and has neglected the development of an educational vocabulary that is theoretically and conceptually appropriate for confronting teachers’ central concerns regarding inclusive practices. The concepts of suspension, bearing with strangers and enlarged thought inspired by Hannah Arendt provide a basis for a re-imagining of inclusive education and for outlining a future school in which inclusiveness is embedded in the very way we think and position ourselves as teachers and pupils.     

Marketing/R&D integration in the pharmaceutical industry

Integrating marketing and R&D inputs is one of the fundamental challenges in managing innovation. In the pharmaceutical industry, considering its reputed ‘technology push’ model of innovation, the challenge of integrating marketing and R&D could hardly be greater. Thus, the recent trend among pharmaceutical firms of implementing Marketing/R&D integrating mechanisms calls for upgrading our conceptualization of the innovation process in this industry. It also raises important questions regarding Marketing's contribution in new product development, and how to organize to assure that contribution is leveraged. We use the case of a pharmaceutical firm which recently implemented Marketing/R&D integrating mechanisms to examine Marketing's new roles. We find that the extreme conditions surrounding innovation in the pharmaceutical industry, notably the need to cope with Knightean uncertainty, highlight important contributions of Marketing input in R&D that deserve more attention. We suggest that Marketing's most important contribution under these conditions lies in ‘not getting it wrong’ rather than ‘getting it right,’ in setting minimum criteria in project evaluations rather than definite targets, and in refocusing the attention of R&D staff through the very process of providing this input. Given the value of these contributions, modern pharmaceutical firms would indeed be ill advised to think of drug discovery as merely a linear process. Drug development has become an interactive process where the timing, type and impact of Marketing involvement is balanced and managed via certain organizational mechanisms throughout the R&D process, which is an iterative one.     

Best entry points for structured document retrieval—Part I: Characteristics

Structured document retrieval makes use of document components as the basis of the retrieval process, rather than complete documents. The inherent relationships between these components make it vital to support users’ natural browsing behaviour in order to offer effective and efficient access to structured documents. This paper examines the concept of best entry points, which are document components from which the user can browse to obtain optimal access to relevant document components. In particular this paper investigates the basic characteristics of best entry points.     

The Model Size Effect in SEM: Inflated Goodness-of-Fit Statistics Are Due to the Size of the Covariance Matrix

The size of a model has been shown to critically affect the goodness of approximation of the model fit statistic T to the asymptotic chi-square distribution in finite samples. It is not clear, however, whether this “model size effect” is a function of the number of manifest variables, the number of free parameters, or both. It is demonstrated by means of 2 Monte Carlo computer simulation studies that neither the number of free parameters to be estimated nor the model degrees of freedom systematically affect the T statistic when the number of manifest variables is held constant. Increasing the number of manifest variables, however, is associated with a severe bias. These results imply that model fit drastically depends on the size of the covariance matrix and that future studies involving goodness-of-fit statistics should always consider the number of manifest variables, but can safely neglect the influence of particular model specifications.     

Perceived learning,critical elements and lasting impacts on university-based wilderness educational expeditions

This study examined participants’ perceptions of learning, critical elements, and lasting impacts of their wilderness expeditions. Fifty-seven students, who completed a for-credit wilderness canoe expedition between 1993 and 2007 at the Augustana Campus, University of Alberta, participated in the investigation. Perceived learning most commonly related to nature and place appreciation, outdoor skills, group living, and self-awareness. Critical elements for learning were the experiential approach, group living, and nature and place immersion. In terms of lasting impacts of the expedition, perceived learning had changed since the expedition for 88% of students, especially in the areas of self-awareness, group living, and greater appreciation of the experience, due to reflection and the passage of time. Furthermore, the expedition had a lasting impact on students’ personal and professional lives, especially related to life experience, nature appreciation, confidence, and skill development. The findings support the notion that wilderness educational expeditions can provide significant and long-lasting learning (uniquely in the area of nature and place appreciation). Finally, because of the nature of educational expeditions, they lend themselves to the implementation of sound experiential pedagogical practices that promote active, engaged, and relevant learning.     

Beyond motivation: history as a method for learning meta-discursive rules in mathematics

In this paper, we argue that history might have a profound role to play for learning mathematics by providing a self-evident (if not indispensable) strategy for revealing meta-discursive rules in mathematics and turning them into explicit objects of reflection for students. Our argument is based on Sfard’s theory of Thinking as Communicating, combined with ideas from historiography of mathematics regarding a multiple perspective approach to the history of practices of mathematics. We analyse two project reports from a cohort of history of mathematics projects performed by students at Roskilde University. These project reports constitute the experiential and empirical basis for our claims. The project reports are analysed with respect to students’ reflections about meta-discursive rules to illustrate how and in what sense history can be used in mathematics education to facilitate the development of students’ meta-discursive rules of mathematical discourse.