Search results

1 – 10 of 328
To view the access options for this content please click here
Article
Publication date: 13 September 2011

K. Svendsen and S.T. Hagen

The purpose of this paper is to describe a model that can be used in the estimation of thermal fatigue limited service life of induction coils.

Abstract

Purpose

The purpose of this paper is to describe a model that can be used in the estimation of thermal fatigue limited service life of induction coils.

Design/methodology/approach

Previous work indicates that the temperature of the cross section of an induction coil can be used to estimate thermal fatigue limited service life. This paper presents a model for estimating these temperatures based on a coupled model. Joule losses modelled in Flux2D are coupled with cooling modelled in Fluent3D. These models are controlled and combined by Python scripts that iterate the heat transfer and temperatures of heat exchange regions between the two domains.

Findings

The combined model is shown to converge nicely. The model is also applied to an optimization problem where a high power loss, copper region is surrounding a wedge‐shaped cooling channel. The point of the wedge was replaced by a radius that was optimized. The optimum was considered where the thermal fatigue service life is maximized, i.e. where the peak deviation from mean temperature in the cross section was at a minimum. The results show that the optimum corner radii are small, typically 0.25‐0.5 mm.

Originality/value

This is the first paper where the full model is presented and used to optimize specific cases.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 30 no. 5
Type: Research Article
ISSN: 0332-1649

Keywords

To view the access options for this content please click here
Book part
Publication date: 5 November 2021

Ugo Guarnacci

This chapter is in line with the strand of literature on urban environmental stewardship and examines how cities around the world have been teaming up with each other in…

Abstract

This chapter is in line with the strand of literature on urban environmental stewardship and examines how cities around the world have been teaming up with each other in order to foster cocreation and codeployment of nature-based solutions (NBS) to tackle global environmental challenges and promote climate-resilient communities. This chapter describes such an effort that cities made to build international alliances and networks as a new wave of “city diplomacy.” Indeed, recent environmental negotiations at the global level on sustainable development and climate change have proven how cities of different size, with diverse socioeconomic and environmental conditions, were able to put NBS on the agenda and show their transformative power for the common good. Throughout the chapter, the European policy context is always placed at the meso level, between the macro (international arena) and the micro (city) dimensions, in order to demonstrate how the European Union has been instrumental in connecting the global, regional, and local agendas on NBS for renaturing cities.

Details

Nature-Based Solutions for More Sustainable Cities – A Framework Approach for Planning and Evaluation
Type: Book
ISBN: 978-1-80043-637-4

Keywords

To view the access options for this content please click here
Article
Publication date: 20 October 2020

Cláudia Pinho, Mário Franco and Luis Mendes

Based on the technology acceptance model (TAM), this study aims to determine the influence of personality traits on the acceptance and usage of Web portals in Portuguese…

Abstract

Purpose

Based on the technology acceptance model (TAM), this study aims to determine the influence of personality traits on the acceptance and usage of Web portals in Portuguese universities.

Design/methodology/approach

To this end, a quantitative study was conducted using structural equation modelling and a structured questionnaire, directed to teaching and non-teaching staff in Portuguese universities.

Findings

The results obtained from 338 valid responses indicate a positive influence between personality traits and the use of Web portals.

Practical implications

The study emphasizes the importance of usefulness and ease of use of Portuguese universities’ Web portals. It contributes to developing the literature about the process of information technology (IT) acceptance and use and users’ personality traits.

Originality/value

This study is innovative by contributing to the theory of personality traits and TAM in the context of Portuguese universities. The results reinforce the literature on TAM and the big five model, and on IT and Web portals in particular, which has been little explored in the academic context.

Details

Information and Learning Sciences, vol. 121 no. 11/12
Type: Research Article
ISSN: 2398-5348

Keywords

To view the access options for this content please click here
Book part
Publication date: 12 November 2018

Carol Azungi Dralega and Hilde G. Corneliussen

This chapter reports from a qualitative study on how identity categories, including gender and ethnicity, are experienced and constructed through video gaming among…

Abstract

This chapter reports from a qualitative study on how identity categories, including gender and ethnicity, are experienced and constructed through video gaming among immigrant youth in Norway. The aim here is to explore the manifestations and contestations of gendered power and hegemonic practices among the young immigrant girls and boys. This chapter builds on research about everyday media use especially video games, and our analysis is based on theories of hegemony, power, gender, and ethnicity. Three key findings are observed from the study: (a) video games acting as a bridge between ethnic minority boys (not so much with the girls) and ethnic Norwegians, (b) hegemonic gendered practices, emphasizing the “otherness,” in particular for girls adhering to the category of gamer, and finally, to a lesser degree, (c) marginalization within video games on the basis of being a non-Western youth in a Western context. As such the study simultaneously not only confirms but also challenges dominant discourses on video games by suggesting that, although some positive strides have been made, the claims of a post-gender neutral online world, or celebrations of an inclusive and democratic online media culture, especially video gaming, are still premature.

Details

Media and Power in International Contexts: Perspectives on Agency and Identity
Type: Book
ISBN: 978-1-78769-455-2

Keywords

To view the access options for this content please click here
Article
Publication date: 7 October 2014

Kirsi Helkala and Tone Hoddø Bakås

The purpose of this paper is to extend the results of a Norwegian password security survey. Research, especially in the early 21st century, has shown that education is…

Abstract

Purpose

The purpose of this paper is to extend the results of a Norwegian password security survey. Research, especially in the early 21st century, has shown that education is needed to change people’s behaviour regarding password generation, management and storage. As our daily routines and duties have become more dependent on electronic services in the last decade, one could think that qualitative education is nowadays given to users. This survey is to verify that assumption.

Methodology

A nation-wide demographic survey among employees in Norway with a sample of 1,003 respondents at the ages of 18-64 years was conducted in October 2012.

Findings

The results show that the education or proper guidance seldom is given leading to the outdated users’ behaviour.

Research limitations

The results of the study are limited to the employed only and they do not explain behaviour of students, teenagers or children.

Social implications

During the current year, the results of the study have been discussed several times in national media and, hopefully, have an impact to employees’ behaviour. The results have also been used in the National Security Month campaign in October 2013.

Originality/value

The questionnaire itself is not unique. However, the large amount of respondents gives higher value to the results.

Details

Information Management & Computer Security, vol. 22 no. 4
Type: Research Article
ISSN: 0968-5227

Keywords

Content available
Book part
Publication date: 14 January 2019

Morgan R. Clevenger and Cynthia J. MacGregor

Abstract

Details

Business and Corporation Engagement with Higher Education
Type: Book
ISBN: 978-1-78754-656-1

To view the access options for this content please click here
Book part
Publication date: 29 August 2017

Philip M. Nichols

In its most basic usage, “corruption” means a change from functional or good to dysfunctional or bad. This definition is far too broad to be of use to scholars or…

Abstract

In its most basic usage, “corruption” means a change from functional or good to dysfunctional or bad. This definition is far too broad to be of use to scholars or policymakers, who need a more precise, shared definition so that they can communicate meaningfully with one another. Scholars and policymakers have developed scores of definitions, which this chapter briefly explains. Within this galaxy of definitions, scholars and policymakers have tended to favor one definition, which this chapter calls the “general definition.” The general definition describes organizational corruption as: the abuse or misuse of power or trust for self-interested purposes rather than the purposes for which power or trust was given. This chapter discusses and illustrates the general definition. The chapter concludes by pointing out that the general definition is only one definition. In many places, the public is deeply concerned with phenomena such as undue influence, which should also be taken into consideration as a form of corruption even though it falls outside of the general definition.

Details

The Handbook of Business and Corruption
Type: Book
ISBN: 978-1-78635-445-7

Keywords

To view the access options for this content please click here
Article
Publication date: 29 November 2018

Jesse Alves da Cunha and Yudhvir Seetharam

Opinions have been divided on whether there is a rational explanation to the reason behind seasoned equity offerings (SEOs) or whether the explanation lies within the…

Abstract

Purpose

Opinions have been divided on whether there is a rational explanation to the reason behind seasoned equity offerings (SEOs) or whether the explanation lies within the behavioural intricacies attributed to stock market participants. The paper aims to discuss these issues.

Design/methodology/approach

This study investigates the long-run performance of firms conducting SEOs on the Johannesburg Stock Exchange (JSE) over the period of 1998–2015, by examining the return performance and operating performance of firms, along with the impact of investor sentiment on these variables.

Findings

The results of this study are inconsistent with the existing literature, which argues that the long-run performance of issuing firms signalled an initial underreaction to SEOs buoyed by over-optimistic investors.

Research limitations/implications

Instead, the long-run performance of issuing firms is adequately explained by the rational models centred on the risk-return framework, implying that investors are reacting swiftly to SEOs in an unbiased fashion.

Originality/value

Investor sentiment does not materially influence the long-run share performance or operating performance of issuing firms, casting doubt on the ability of the market timing theory to explain the long-run performance of SEOs. The authors thus find that SEO performance cannot be explained by behavioural-based reasoning, in contrast to some asset pricing studies on the JSE which indicate the role of sentiment in explaining returns.

Details

International Journal of Emerging Markets, vol. 13 no. 5
Type: Research Article
ISSN: 1746-8809

Keywords

To view the access options for this content please click here
Article
Publication date: 31 January 2020

Stefan Schubotz and Bernard Nacke

The purpose of this study is now to optimize the coil in a way that its lifetime is increased. In the industry, induction hardening of rotationally symmetrical workpieces…

Abstract

Purpose

The purpose of this study is now to optimize the coil in a way that its lifetime is increased. In the industry, induction hardening of rotationally symmetrical workpieces in a single-shot process is a common method. Owing to only partial superimposition of the workpiece areas to be heated by the inductor, high power densities are frequently needed there. These lead to local hot spots, amounting to an intensive material stress in the copper and often result in short lifetime of the inductor.

Design/methodology/approach

In this elaboration, some numerically analysed approaches are presented that can be used to reduce mechanical stresses in the single-shot inductor and thus increase the service life.

Findings

It has been found out that changing the coil profiles has a strong influence on its lifetime. Besides that, the heat transfer coefficient between coil and coolant plays a big role and needs to be considered when the coil is dimensioned.

Originality/value

The lifetime of the coil is an important factor and often requested from the customers. Broken coils create a lot of extra costs and can generate downtime. Therefore, many customers that are struggling with thermal fatigue are interested in approaches that prolong the coil lifetime.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 39 no. 1
Type: Research Article
ISSN: 0332-1649

Keywords

To view the access options for this content please click here
Article
Publication date: 26 June 2019

Abdul Rehman, Zhang Deyuan, Sehresh Hena and Abbas Ali Chandio

The purpose of this paper is to investigate and explore the connection between aquaculture and capture fisheries production and economic growth in Pakistan. Fisheries play…

Abstract

Purpose

The purpose of this paper is to investigate and explore the connection between aquaculture and capture fisheries production and economic growth in Pakistan. Fisheries play an important role in Pakistan’s national economy, and Pakistan has sufficient fishery resources to be developed. Most of the population in the coastal areas depends on fisheries for their livelihood.

Design/methodology/approach

This research was based on time series data of aquaculture and capture fisheries production and the analysis of their relationship with economic growth in Pakistan. The study used an autoregressive distributed lag (ARDL) bounds testing approach to check the dynamic causality between the study variables.

Findings

The results showed that aquaculture and capture fisheries production have had a positive effect on the economic growth in Pakistan.

Practical implications

Better infrastructure for the fishing industry, increased government expenditure on facilities and financial support for the fish farmers could contribute to economic growth in the future. Recommendations for improvements in these areas have been made.

Originality/value

By using an ARDL bounds testing approach, this study contributes to the literature regarding fisheries production and economic growth in Pakistan.

Details

British Food Journal, vol. 121 no. 8
Type: Research Article
ISSN: 0007-070X

Keywords

1 – 10 of 328