R. Zwingel, L. Jänicke, M. Stichler and A. Kost
While optimizing highly utilized induction machines — e.g. for traction applications — the problem of cooling is of importance. The necessary cooling ducts in the rotor lead to…
Abstract
While optimizing highly utilized induction machines — e.g. for traction applications — the problem of cooling is of importance. The necessary cooling ducts in the rotor lead to saturation problems in the rotor iron. As there exist no analytical means for solving the resulting nonlinear field problem, the effects on the magnetic field have to be investigated by numerical methods. This paper presents the application of the adaptive 2D finite element method for a study of the cooling ducts' effects.
Yoshifumi Okamoto, Akihisa Kameari, Koji Fujiwara, Tomonori Tsuburaya and Shuji Sato
– The purpose of this paper is the realization of Fast nonlinear finite element analysis (FEA).
Abstract
Purpose
The purpose of this paper is the realization of Fast nonlinear finite element analysis (FEA).
Design/methodology/approach
Nonlinear magnetic field analysis is achieved by using Newton-Raphson method implemented by relaxed convergence criterion of Krylov subspace method.
Findings
This paper mathematically analyzes the reason why nonlinear convergence can be achieved if the convergence criterion for linearized equation is relaxed.
Research limitations/implications
The proposed method is essential to reduce the elapsed time in nonlinear magnetic field analysis of quasi-stationary field.
Practical implications
The proposed method is able to be extended to not only static field but also time domain FEA strongly coupled with circuit equation.
Social implications
Because the speedup of performance evaluation of electrical machines would be achieved using proposed method, the work efficiency in manufacturing would be accelerated.
Originality/value
It can be seen that the nonlinear convergence can be achieved if the convergence criterion for linearized equation is relaxed. The verification of proposed method is demonstrated using practical nonlinear magnetic field problem.
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Mark Glenn Evans, Ying He, Iryna Yevseyeva and Helge Janicke
This paper aims to provide an understanding of the proportions of incidents that relate to human error. The information security field experiences a continuous stream of…
Abstract
Purpose
This paper aims to provide an understanding of the proportions of incidents that relate to human error. The information security field experiences a continuous stream of information security incidents and breaches, which are publicised by the media, public bodies and regulators. Despite the need for information security practices being recognised and in existence for some time, the underlying general information security affecting tasks and causes of these incidents and breaches are not consistently understood, particularly with regard to human error.
Design/methodology/approach
This paper analyses recent published incidents and breaches to establish the proportions of human error and where possible subsequently uses the HEART (human error assessment and reduction technique) human reliability analysis technique, which is established within the safety field.
Findings
This analysis provides an understanding of the proportions of incidents and breaches that relate to human error, as well as the common types of tasks that result in these incidents and breaches through adoption of methods applied within the safety field.
Originality/value
This research provides original contribution to knowledge through the analysis of recent public sector information security incidents and breaches to understand the proportions that relate to human error.
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Keywords
The development of electrical machines is nowadays closely related to the knowledge of the electromagnetic fields throughout the different parts of a machine. Although a machine…
Abstract
The development of electrical machines is nowadays closely related to the knowledge of the electromagnetic fields throughout the different parts of a machine. Although a machine is often of complicated geometrical structure and of different, mostly nonlinear materials, modern numerical methods and the related software allow calculation of the fields in 2D models and several 3D cases precisely enough in order to derivate from them quantities like energy density distribution, the torque behaviour and characteristics like load and no load. The paper will at first compare numerical methods suited for electromagnetic field calculation in electrical machines. The following topic deals with adaptive mesh generation playing an important role to save computer memory and cpu time. Then examples like a Switched Reluctance Machine, an Asynchronous Machine and a Stepping Motor are shown concerning the results of field calculation. It is shown that anisotropy may have to be taken into account, and finally it is shown that field calculation enables the shape optimization of a machine.
Fabian Weber, Maria Juschten, Carina Fanninger, Christiane Brandenburg, Alexandra Jiricka-Pürrer, Christina Czachs and Wiebke Unbehaun
With an increase in hot days, tropical nights, and heat waves, assumedly more residents of large cities will seek rest and recreation in higher-altitude tourism destinations…
Abstract
With an increase in hot days, tropical nights, and heat waves, assumedly more residents of large cities will seek rest and recreation in higher-altitude tourism destinations during the summer. This phenomenon is referred to as the revival of ‘Sommerfrische’ (summer freshness or summer retreat). This chapter examines the impact of climate change on summer tourism in the Alps by urban residents. It scrutinizes the historical perception of the term Sommerfrische, as well as the understanding and perception of this term today, based on an extensive literature review and two focus-group discussions. The findings form the basis for specifying the attributes that can be used to describe a modern form of Sommerfrische. The results indicate that today’s understanding of what Sommerfrische could be and the attributes of Sommerfrische travel are very different from the historical phenomenon. Nowadays, summer excursions and short trips to destinations close to cities are considered to be Sommerfrische as long as they have escape from the heat as a common motive. The results demonstrate the broad interest of urban residents in Sommerfrische and also suggest avenues for further research on the adaptative behavior of town-dwellers in hot summers with respect to the extent of their actual and potential future travel behavior.
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Mohammad Olfat, Sajjad Shokouhyar, Sadra Ahmadi and Seyed Mohammad Mahdi Ghaderi
This study utilized “social cognitive theory” to compare the impacts of organizational members' hedonic and work-related use of public social networks (SNs) and enterprise social…
Abstract
Purpose
This study utilized “social cognitive theory” to compare the impacts of organizational members' hedonic and work-related use of public social networks (SNs) and enterprise social networks (ESNs) on job satisfaction.
Design/methodology/approach
The participants comprised 240 employees who were able to simultaneously use SNs and ESNs in the workplace with regard to both hedonic and work-related motives. The measurement and structural models were evaluated using partial least squares structural equations modeling (PLS-SEM).
Findings
The results show that organizational members' hedonic and work-related use of public SNs enhances job satisfaction. However, the hedonic and work-related use of ESNs has negative and positive impacts on job satisfaction respectively.
Originality/value
The main theoretical contribution of this study lies in showing that employees' use of social networks does not necessarily entail detrimental or beneficial consequences and depending on different factors the outcomes are different. Following a comprehensive review of the literature, users' incentives and platforms emerged as two different factors contributing to the outcomes arising from the use of social networks in the workplace. Although a few studies have explored the impacts of organizational members' use of social networks on job satisfaction, none have done so in relation to different user incentives and platforms.
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Irina Munteanu, Catalin Ciobotaru and Daniel Ioan
The numerical solution of electromagnetic field nonlinear problems requires successive building and solving of linear systems of equations. This is the most time–consuming part…
Abstract
The numerical solution of electromagnetic field nonlinear problems requires successive building and solving of linear systems of equations. This is the most time–consuming part, especially for large problems. Both fast linear solvers and efficient nonlinear iterative algorithms, are critical for the overall efficiency of the nonlinear electromagnetic field solver. This paper presents an analysis of a variety of techniques that can be efficiently used to reduce the solution time of nonlinear magnetic field equations in large finite element method (FEM) problems.
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N. TAKAHASHI, T. NAKATA and H. MORISHIGE
Thirteen computer codes developed by eleven groups are applied to the benchmark problem 20 (3‐D static force problem) for the TEAM Workshop. The solutions are compared with each…
Abstract
Thirteen computer codes developed by eleven groups are applied to the benchmark problem 20 (3‐D static force problem) for the TEAM Workshop. The solutions are compared with each other and with experimental results.
This bibliography aims to give citations and annotations for a core selection of sources on the information and learning commons trend in academic libraries.
Abstract
Purpose
This bibliography aims to give citations and annotations for a core selection of sources on the information and learning commons trend in academic libraries.
Design/methodology/approach
Articles, books, and web sites relevant to this topic were found in the Library, Information Science & Technology Abstracts database; Library Literature Index; WorldCat; and on the internet. Sources were chosen that contribute to an overview of the concepts or cover practical considerations in implementation.
Findings
Libraries are developing best practices as they experiment with learner‐centered service models, but they apply these best practices differently according to their unique needs. Early implementations focus on technology and access, while later implementations focus on more collaborations surrounding learner‐centered pedagogies.
Research limitations/implications
This bibliography selects from English language books, web sites, and peer reviewed journals about US, British, Canadian, and Oceania academic libraries, large and small.
Originality/value
This survey of the literature will help librarians and administrators understand the theoretical trends and collaboration that influence how libraries can change service, space, and technology to meet emerging needs.
Details
Keywords
Xuan-Hoa Nghiem, Huong Trang Pham, Thu Giang Nguyen and Thi Kim Duyen Nguyen
Climate change has been universally recognized as a major threat to human well-being, necessitating a comprehensive transformation of people's activities. Various measures have…
Abstract
Climate change has been universally recognized as a major threat to human well-being, necessitating a comprehensive transformation of people's activities. Various measures have been proposed to contain climate change among which the green transformation grabs special attention, thanks to its desirable properties. Within the green transformation process, green tourism comes to prominence with huge potential. As one of the largest carbon emitters, the transition towards green tourism may offer substantial benefits not only for tourism companies but also for the whole economy. Yet, most studies tend to focus on the adverse effects of tourism on climate change while overlooking the potential impact of climate change on tourism. This chapter clarifies the feedback relationship between climate change and tourism and makes some recommendations.