Lars Kielhorn, Thomas Rüberg and Jürgen Zechner
Electrical machines commonly consist of moving and stationary parts. The field simulation of such devices can be demanding if the underlying numerical scheme is solely based on a…
Abstract
Purpose
Electrical machines commonly consist of moving and stationary parts. The field simulation of such devices can be demanding if the underlying numerical scheme is solely based on a domain discretization, such as in the case of the finite element method (FEM). This paper aims to present a coupling scheme based on FEM together with boundary element methods (BEMs) that neither hinges on re-meshing techniques nor deals with a special treatment of sliding interfaces. While the numerics are certainly more involved, the reward is obvious: the modeling costs decrease and the application engineer is provided with an easy-to-use, versatile and accurate simulation tool.
Design/methodology/approach
The authors present the implementation of a FEM-BEM coupling scheme in which the unbounded air region is handled by the BEM, while only the solid parts are discretized by the FEM. The BEM is a convenient tool to tackle unbounded exterior domains, as it is based on the discretization of boundary integral equations (BIEs) that are defined only on the surface of the computational domain. Hence, no meshing is required for the air region. Further, the BIEs fulfill the decay and radiation conditions of the electromagnetic fields such that no additional modeling errors occur.
Findings
This work presents an implementation of a FEM-BEM coupling scheme for electromagnetic field simulations. The coupling eliminates problems that are inherent to a pure FEM approach. In detail, the benefits of the FEM-BEM scheme are: the decay conditions are fulfilled exactly, no meshing of parts of the exterior air region is necessary and, most importantly, the handling of moving parts is incorporated in an intriguingly simple manner. The FEM-BEM formulation in conjunction with a state-of-the-art preconditioner demonstrates its potency. The numerical tests not only reveal an accurate convergence behavior but also prove the algorithm to be suitable for industrial applications.
Originality/value
The presented FEM-BEM scheme is a mathematically sound and robust implementation of a theoretical work presented a decade ago. For the application within an industrial context, the original work has been extended by higher-order schemes, periodic boundary conditions and an efficient treatment of moving parts. While not intended to be used under all circumstances, it represents a powerful tool in case that high accuracies together with simple mesh-handling facilities are required.
Details
Keywords
The NEA began its ascent as a political force slowly. In the early 1960s, NEA leaders had rejected efforts to create a political role for the Association. In fact, in 1960, NEA…
Abstract
The NEA began its ascent as a political force slowly. In the early 1960s, NEA leaders had rejected efforts to create a political role for the Association. In fact, in 1960, NEA leaders – sensitive to members’ desire for an organization focused on professionalism – summarily rejected a suggestion to adopt a theme of “Every Teacher a Politician” (Berube, 1988).
Sidney Weil, Nicholas McGuigan, Thomas Kern and Baiding Hu
This study aims to examine students' perceptions of the use of asynchronous discussion forums to facilitate case‐based learning in financial accounting, measuring whether…
Abstract
Purpose
This study aims to examine students' perceptions of the use of asynchronous discussion forums to facilitate case‐based learning in financial accounting, measuring whether students' perceptions of the benefits of using online discussion forums are related to – and can be predicted from – students' demographic profiles. The paper commences by briefly reviewing the case study‐based learning literature, followed by an in‐depth review of the use of asynchronous discussion forums as a delivery platform. These pedagogical approaches are then linked to the emerging needs and learning styles of the current generation of “digital” students.
Design/methodology/approach
The study, which is questionnaire‐based, uses data collected from two New Zealand universities. A choice modelling approach is used to analyse the data in order to correlate students' preferences for online discussion forum usage with their profiles.
Findings
The findings of the study indicate that students perceive numerous benefits to be associated with case‐based online discussions, including learning from other students' opinions and perspectives, the opportunity to debate issues critically, encouragement to think independently, a heightened awareness of their communication ability and assisting them to revise prior‐held views of accounting. These findings, supported by students' comments, suggest that the use of asynchronous discussion forums has created a social discourse of learning, assisting in the construction of a community of practice in financial accounting. The choice modelling analysis of the results indicates that the students most likely to be positively disposed towards discussion groups are older, male, domestic students, who have English as a first language. Of the international student respondents, Asian students perceive the forum as being most useful.
Originality/value
The study provides evidence that accounting students perceive value from the use of asynchronous discussion forums. Furthermore, the choice modelling identifies which particular groups of students may benefit most from the use of online discussion forums. The findings suggest that accounting educators may gainfully employ this learning technique in their courses as a means of developing critical thinking skills, building a heightened awareness of the student's ability to communicate and enhancing overall student engagement and participation in course work.
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Safdar Khan, Sujood, Asad Rehman, Saima Kareem and Ramzi Al Rousan
This systematic literature review (SLR) seeks to thoroughly investigate and synthesize existing research primarily focused on the role and impact of livestreaming technologies in…
Abstract
Purpose
This systematic literature review (SLR) seeks to thoroughly investigate and synthesize existing research primarily focused on the role and impact of livestreaming technologies in the events industry. The review aims to uncover key trends and strategies associated with the integration of livestreaming in several event settings, including conferences, concerts and virtual events.
Design/methodology/approach
Employing a systematic approach, this review involves a meticulous search of the Scopus database and relevant literature using a predefined search string. The search is tailored to capture studies that specifically address livestreaming, with a focus on events such as conferences, concerts and other public gatherings.
Findings
This SLR uncovers the findings related to various aspects of livestreaming at events. Key areas of interest include the strategies employed by event organizers, audience experiences, technical requirements, monetization models, social media integration and the suitability of livestreaming in different event categories. By synthesizing the findings from the selected studies, this review provides an integrated framework of how livestreaming technologies impact event management, engagement and overall audience satisfaction.
Research limitations/implications
While striving for comprehensiveness, this SLR acknowledges potential limitations inherent in the available literature. Variability in research methodologies, publication biases and evolving technologies may introduce limitations. Additionally, the scope is limited to English-language publications within the specified subject areas. These limitations will be transparently discussed to guide future studies and promote the efficient utilization of livestreaming technologies in the events industry.
Originality/value
The originality of this SLR hinges on its thorough examination of the current state of knowledge on livestreaming technologies in events. The identification of trends and strategies will offer valuable insights for both scholars and practitioners, guiding future research directions and informing strategic decision-making in the dynamic field of event management.