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Article
Publication date: 1 April 1995

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…

36

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.

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COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 14 no. 4
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 7 September 2015

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).

343

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.

Details

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 34 no. 5
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 3 June 2019

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…

780

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.

Details

Information & Computer Security, vol. 27 no. 3
Type: Research Article
ISSN: 2056-4961

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Article
Publication date: 1 April 1995

A. Kost

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…

114

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.

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COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 14 no. 4
Type: Research Article
ISSN: 0332-1649

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Book part
Publication date: 12 September 2018

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.

Details

Contemporary Challenges of Climate Change, Sustainable Tourism Consumption, and Destination Competitiveness
Type: Book
ISBN: 978-1-78756-343-8

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Article
Publication date: 2 September 2021

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…

560

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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Article
Publication date: 1 June 2002

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…

269

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.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 21 no. 2
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 1 February 1995

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…

119

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.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 14 no. 2/3
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 15 May 2009

Tim Held

This bibliography aims to give citations and annotations for a core selection of sources on the information and learning commons trend in academic libraries.

2354

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

Reference Services Review, vol. 37 no. 2
Type: Research Article
ISSN: 0090-7324

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Book part
Publication date: 18 September 2024

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.

Details

The Emerald Handbook of Tourism Economics and Sustainable Development
Type: Book
ISBN: 978-1-83753-709-9

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