Radiation fields from polygonal sources

The calculation of the radiation field D(x, y, z) produced by a uniform polygonal source is of considerable practical importance. Fock showed that there are advantages in replacing the traditional surface integral by a contour integral, using Stokes' theorem. This innovation, however, has not yet penetrated very deeply. It seemed worthwhile, therefore, to systematize the procedure and to show how easily results can be obtained by the Fock method. An incidental conclusion of the paper is that the radiation field from a polygonal source often differs by less than one per cent from the field produced by a circular disk of the same area. Thus the simple disk formula can often be substituted for the more complicated polygonal formula.     

Building National Capacity for Research Mentor Training: An Evidence-Based Approach to Training the Trainers

Research mentor training (RMT), based on the published Entering Mentoring curricula series, has been shown to improve the knowledge and skills of research mentors across career stages, as self-reported by both the mentors engaged in training and their mentees. To promote widespread dissemination and empower others to implement this evidence-based training at their home institutions, we developed an extensive, interactive, multifaceted train-the-trainer workshop. The specific goals of these workshops are to 1) increase facilitator knowledge of an RMT curriculum, 2) increase facilitator confidence in implementing the curriculum, 3) provide a safe environment to practice facilitation of curricular activities, and 4) review implementation strategies and evaluation tools. Data indicate that our approach results in high satisfaction and significant confidence gains among attendees. Of the 195 diverse attendees trained in our workshops since Fall 2010, 44% report implementation at 39 different institutions, collectively training more than 500 mentors. Further, mentors who participated in the RMT sessions led by our trained facilitators report high facilitator effectiveness in guiding discussion. Implications and challenges to building the national capacity needed for improved research mentoring relationships are discussed.     

Enriching preservice teachers’ critical reflection through an international videoconference discussion

The concepts of reflection and reflective practice have become the core of many teacher education programmes, with critical reflection as the goal for many teacher educators. This study examined the use of a videoconference discussion in an instructional methodology course as a means to enrich the process of reflection and encourage critical reflection. Critical action research methodology was used by the researchers to evaluate the addition of videoconferencing to a model of scaffolded reflection which was already part of the course. The findings suggest that the introduction of a videoconference discussion to the scaffolded reflection model enriched critical reflection on four topics: technology use, multicultural curriculum and instruction, censorship of web-based resources, and accountability and assessment. The discussion of these topics allowed the preservice teachers to think about their own agency, and the affordances and constraints of their school context. Implications for using videoconferencing for critical reflection are provided for teacher educators.     

At a Crossroads or Caught in the Crossfire?

This study of crime reporting shows that keeping crime records secret hurts democratic consolidation. While many reporters and journalism experts interviewed claimed to value the presumption of innocence, at the same time, many skirted legal restrictions and ethical codes. Police and prosecutors supplied leaks, and reporters sought further information from witnesses. This porous secrecy leads to publication of rumors and unreliable eye-witness accounts. Four exacerbating factors affect this reporting method: widespread “clientelism,” a partisan news media, an alternative definition of “public interest,” and weak professionalism.     

Peer Assessment of Group Projects in Civil Engineering

This article traces one university's approaches of peer assessment to develop fair and reliable systems of mark distribution resulting from group projects and to adapt one model to the specific requirements of civil engineering. It is the result of a two and a half years' experience with peer assessment in classes of different combinations of size, entry qualifications and experience. Initially, the methods devised by Goldfinch & Raeside (1990) were used; the relevance and drawbacks of this two‐part method of assessment in the field of civil engineering are discussed and new ideas are proposed. That article had suggested that the model is transferable. It has proved to be the case and in this discipline, that project diaries which the tutor uses to allocate individuals a mark, offer a unique alternative to Part 1 of the assessment process.     

The mind of a plagiarist

The ease with which material may be ‘copied and pasted’ from the Internet into written work is raising concern in educational institutions, and particularly in those disciplines that use online sources and methods in their curriculum. A case of ‘serial plagiarism’ is discussed, in the work of a graduate student in an online distance education program. The complexity of the student’s thinking is emphasized, and the manner in which the case was handled by the teacher and the university. The use of an online plagiarism‐checking technology (Turnitin.com) and the value of such services are discussed. The case illustrates the importance of explaining the precise nature of plagiarism to students, of providing clear warnings about its consequences and of developing a careful institutional approach to plagiarism detection and prevention.     

Individual differences in language performance after cochlear implantation at one to three years of age: child, family, and linguistic factors

Language skills were investigated in a multicultural sample of 13 prelingually deaf children (11 profoundly deaf from birth) who received cochlear implants between 14 and 38 months of age; average duration of implant use was 49 months. Individual postimplant language skills ranged from extremely delayed to age appropriate. On average, skills varied across domains: on vocabulary, several children functioned in the average range compared with hearing peers, but all were below that range on a test emphasizing syntax (CELF-P). Children with preimplant hearing experience had the highest scores on all language measures. Excluding these children, age of implantation (range 14 to 27 months) associated inversely and significantly with CELF-P scores, even when nonverbal IQ was controlled. Qualitative analyses indicated higher child language achievement associated with parents' reports of lengthy, in-depth processes to decide about cochlear implantation. Such reports may indicate high levels of ongoing parent involvement with child and programming.