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Article
Publication date: 25 June 2020

Jan Kühn, Andreas Bartel and Piotr Putek

The thermally extended Tellinen model (Kühn et al., to appear) is here investigated and equipped with a hysteresis loss model, while preserving its simple structure.

Abstract

Purpose

The thermally extended Tellinen model (Kühn et al., to appear) is here investigated and equipped with a hysteresis loss model, while preserving its simple structure.

Design/methodology/approach

As in the original model, these approaches are based upon phenomenal observations and measured saturation curves. The authors start with the original model and step-by-step add their extensions, such that in the end they can apply the extended model in a finite element method (FEM) simulation. During the process, care is taken to ensure that the applicability in a FEM simulation is not impaired, in terms of memory requirements and computing power.

Findings

In comparison to the original model, this extended model needs some further requirements and so is a little bit more limited in its application. It is in itself coherent and well defined. The authors provide an on-the-fly algorithm computation of hysteresis losses. First numerical results for a coupled field/thermal system show expected behavior.

Originality/value

The original model (Tellinen, 1998) does not take temperature into account. It includes a model for calculating hysteresis losses, but it differs largely from the approach presented here. The thermal extension is now also equipped with an on-the-fly method for hysteresis losses. Furthermore, the authors provide some analysis of simple, stable loops.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 40 no. 2
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 1 July 2014

Timo Hülsmann, Andreas Bartel, Sebastian Schöps and Herbert De Gersem

The purpose of this paper is to develop a fast and accurate analytic model function for the single-valued H-B curve of ferromagnetic materials, where hysteresis can be disregarded…

Abstract

Purpose

The purpose of this paper is to develop a fast and accurate analytic model function for the single-valued H-B curve of ferromagnetic materials, where hysteresis can be disregarded (normal magnetization curve). Nonlinear magnetoquasistatic simulations demand smooth monotone material models to ensure physical correctness and good convergence in Newton's method.

Design/methodology/approach

The Brauer model has these beneficial properties, but is not sufficiently accurate for low and high fields in the normal magnetization curve. The paper extends the Brauer model to better fit material behavior in the Rayleigh region (low fields) and in full saturation. Procedures for obtaining optimal parameters from given measurement points are proposed and tested for two technical materials. The approach is compared with cubic spline and monotonicity preserving spline interpolation with respect to error and computational effort.

Findings

The extended Brauer model is more accurate and even maintains the computational advantages of the classical Brauer model. The methods for obtaining optimal parameters yield good results if the measurement points have a distinctive Rayleigh region.

Originality/value

The model function for ferromagnetic materials enhances the precision of the classical Brauer model without notable additional simulation cost.

Details

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 33 no. 4
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 15 November 2011

Markus Clemens, Sebastian Scho¨ps, Herbert De Gersem and Andreas Bartel

The space discretization of eddy‐current problems in the magnetic vector potential formulation leads to a system of differential‐algebraic equations. They are typically time…

Abstract

Purpose

The space discretization of eddy‐current problems in the magnetic vector potential formulation leads to a system of differential‐algebraic equations. They are typically time discretized by an implicit method. This requires the solution of large linear systems in the Newton iterations. The authors seek to speed up this procedure. In most relevant applications, several materials are non‐conducting and behave linearly, e.g. air and insulation materials. The corresponding matrix system parts remain constant but are repeatedly solved during Newton iterations and time‐stepping routines. The paper aims to exploit invariant matrix parts to accelerate the system solution.

Design/methodology/approach

Following the principle “reduce, reuse, recycle”, the paper proposes a Schur complement method to precompute a factorization of the linear parts. In 3D models this decomposition requires a regularization in non‐conductive regions. Therefore, the grad‐div regularization is revisited and tailored such that it takes anisotropies into account.

Findings

The reduced problem exhibits a decreased effective condition number. Thus, fewer preconditioned conjugate gradient iterations are necessary. Numerical examples show a decrease of the overall simulation time, if the step size is small enough. 3D simulations with large time step sizes might not benefit from this approach, because the better condition does not compensate for the computational costs of the direct solvers used for the Schur complement. The combination of the Schur approach with other more sophisticated preconditioners or multigrid solvers is subject to current research.

Originality/value

The Schur complement method is adapted for the eddy‐current problem. Therefore, a new partitioning approach into linear/non‐linear and static/dynamic domains is proposed. Furthermore, a new variant of the grad‐div gauging is introduced that allows for anisotropies and enables the Schur complement method in 3D.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 30 no. 6
Type: Research Article
ISSN: 0332-1649

Keywords

Book part
Publication date: 1 October 2008

Solomon W. Polachek and Konstantinos Tatsiramos

Who works, how much one works, and what one earns are the cornerstones of labor economics. However, determining the answers to these questions can be tricky because many factors…

Abstract

Who works, how much one works, and what one earns are the cornerstones of labor economics. However, determining the answers to these questions can be tricky because many factors are involved in estimating labor supply, explaining the implications of labor demand, and determining the resulting earnings. This volume contains 13 chapters on these components of the labor market. Five deal directly with labor supply; four deal with labor demand, most notably the effect of cyclical demand fluctuations; and the remaining four deal with compensation, particularly wages, wage distributions, and fringe benefits.

Details

Work, Earnings and Other Aspects of the Employment Relation
Type: Book
ISBN: 978-1-84950-552-9

Book part
Publication date: 21 May 2007

Solomon W. Polachek and Oliver Bargain

Understanding how worker well-being is distributed across the population is of paramount importance. With such knowledge policy makers can devise efficient strategies to improve…

Abstract

Understanding how worker well-being is distributed across the population is of paramount importance. With such knowledge policy makers can devise efficient strategies to improve social welfare. This volume contains 13 chapters on topics enhancing our comprehension of inequality across workers. The issues addressed deal directly with the economic institutions that affect individual and family earnings distributions. The themes explored include job training, worker and firm mobility, minimum wages, wage arrears, unions, collective bargaining, unemployment insurance, and schooling. Among the questions answered are: To what extent do greater work hours of women mitigate the widening family earnings distribution? To what extent does deunionization widen the distribution of earnings? Do computers really cause a widening of the earnings distribution? How would the Russian wage distribution change if one accounted for wage arrears? How much of job creation and job destruction comes about because of business relocation? To what extent does maternal education increase children's education? Why do increases in the minimum wage fail to substantially decrease employment as economic theory would predict? And, to what extent do job skills matter for low-income workers?

Details

Aspects of Worker Well-Being
Type: Book
ISBN: 978-1-84950-473-7

Article
Publication date: 20 June 2023

Janet Kyogabiirwe Bagorogoza, Jaap van den Herik, Andrea de Waal and Bartel van de Walle

The study examines the mediating effect of knowledge management (KM) in the relationship between the high-performance organisation (HPO) framework and high performance in…

Abstract

Purpose

The study examines the mediating effect of knowledge management (KM) in the relationship between the high-performance organisation (HPO) framework and high performance in financial institutions (FIs) in Uganda. The paper aims to develop a framework that promotes high performance in the FIs.

Design/methodology/approach

The conceptual model was tested on a sample of 28 financial instituitions using structural equation model.

Findings

The findings revealed that the high-performance framework is significantly related to high performance and KM is related high performance. KM mediates the relationship between the high-performance framework and high performance.

Research limitations/implications

The findings revealed that the high-performance framework is significantly related to high performance and KM is related high performance. KM mediates the relationship between the high-performance framework and high performance.

Practical implications

The findings revealed that the high-performance framework is significantly related to high performance and KM is related high performance. KM mediates the relationship between the high-performance framework and high performance.

Originality/value

This study makes several empirical and theoretical contributions, addressing the gap in the literature about the role of the HPO framework in strategic management. This study tests the relationship between the HPO and the firm's performance by taking the mediating effects of KM. The designed model highlights a significant organisational performance approach that can influence the finance sector positively.

Details

International Journal of Productivity and Performance Management, vol. 73 no. 4
Type: Research Article
ISSN: 1741-0401

Keywords

Open Access
Article
Publication date: 24 August 2020

Hui Huang, Daniele Leone, Andrea Caporuscio and Sascha Kraus

The present article aims at rising stream of literature about intellectual capital in healthcare organizations, by exploring how knowledge-based activities are designed to promote…

4490

Abstract

Purpose

The present article aims at rising stream of literature about intellectual capital in healthcare organizations, by exploring how knowledge-based activities are designed to promote innovation and create value. This process concerns not only buyers and sellers of industrial products/services but, more widely, larger networks of healthcare actors which include patients, payers and health institutions.

Design/methodology/approach

To answer the research question, we adopted a conceptual approach aimed at reaching overall comprehension of healthcare innovation mechanisms. We have tracked the pivotal extant studies for catching the roots and dynamics at the base of diffusion of healthcare innovation. This article demonstrates, based on previous literature and theoretical speculations, the contribution that innovative knowledge-based activities (e.g. market access approach) make to intellectual capital in healthcare organizations to promote innovation and create value.

Findings

The results show that three knowledge-based activities of the healthcare ecosystem shape the basis of the proposed conceptual framework. First, a value co-creation strategy to develop capabilities for each health stakeholder is intended as human capital. Second, the market access approach to promote innovation is reported to the relational capital. Third, a digital servitization strategy is referred to the structural capital.

Research limitations/implications

This paper provides implications for the stream of literature about intellectual capital in healthcare organizations. It aims at exploring three knowledge-based activities as value co-creation, market access and digital servitization that respond to different intellectual capital levels components (human, relational, structural).

Originality/value

This article provides a conceptual framework based on the linkage of two fundamental streams of management studies, which correspond to innovation diffusion and intellectual capital management. This offers a more solid conceptualization for managing intellectual capital in healthcare organizations with respect to previous studies and creates value in the ecosystem.

Details

Journal of Intellectual Capital, vol. 22 no. 2
Type: Research Article
ISSN: 1469-1930

Keywords

Open Access
Book part
Publication date: 14 December 2023

Stefan Prigge and Katharina J. Mengers

This chapter presents the current research status of family constitutions from an economics perspective. It locates the family constitution as part of the family and business…

Abstract

This chapter presents the current research status of family constitutions from an economics perspective. It locates the family constitution as part of the family and business governance structure of a family firm and the owner family. The typical structure and content of a family constitution are introduced. The chapter focuses on the status of research about family constitutions and provides a structured map for future research. With regard to extant research, it must be stated that the stock of literature is small. The contributions to literature are categorized in surveys; conceptual contributions; survey data; small sample, qualitative, empirical studies; and big sample, quantitative, empirical studies. The latter group includes three studies with a separate family constitution variable. This small number symbolizes that the family constitution still is an under-researched area. Therefore, family constitution research is far away from being able to answer central questions of advice-seeking owner families like, for example, whether a family constitution affects family performance, firm performance, or both; or whether the development process of a family constitutions disposes of an effect on family or firm performance separately from the hypothesized effect of the family constitution document.

Article
Publication date: 12 February 2018

Christian Ritzel, Andreas Kohler and Stefan Mann

The purpose of this paper is to determine if the institutional quality of developing countries (DCs) and least-developed countries (LDCs) contributes to a significant increase in…

Abstract

Purpose

The purpose of this paper is to determine if the institutional quality of developing countries (DCs) and least-developed countries (LDCs) contributes to a significant increase in the utilization rate of the Swiss generalized system of preferences in the agro-food sector.

Design/methodology/approach

The authors use state of the art regression techniques accounting for zero values to identify if the institutional quality – separately depicted by the Worldwide Governance Indicators, the Index of Economic Freedom and the Human Development Index – can contribute in overcoming non-tariff barriers (NTBs) to trade.

Findings

The institutional quality exerts a consistent positive effect on the level of utilization of trade preferences.

Research limitations/implications

Swiss food trade represents, of course, only a very small share of world trade, therefore it would be worthwhile to extend the analysis to other countries and sectors.

Practical implications

Industrialized countries’ development policies should more strongly focus on capacity building in DCs and LDCs to strengthen trade-related institutions.

Originality/value

The study focuses on an often underemphasized element in international trade relations – the role of the institutional quality in overcoming NTBs to trade.

Details

International Journal of Social Economics, vol. 45 no. 2
Type: Research Article
ISSN: 0306-8293

Keywords

Book part
Publication date: 28 June 2017

Kajsa Asplund, Pernilla Bolander and Andreas Werr

Performance management can play an important role in the implementation of strategic change, by aligning employees’ mindsets and behavior with organizational goals. However, the…

Abstract

Performance management can play an important role in the implementation of strategic change, by aligning employees’ mindsets and behavior with organizational goals. However, the ways in which employees react to change efforts aided by performance management practices are far from straight-forward. In this chapter, we develop a conceptual framework for understanding employees’ reactions to strategic change as a consequence of their occupational identities and their performance management outcome. We further apply the framework to an empirical study of a strategic change initiative in a school organization that was supported by a new performance management practice. We show how variations in perceived identity threat translate into four distinct patterns of emotional and behavioral reactions, where only one represents whole-hearted change acceptance. The study contributes to our understanding of individual- and group-level heterogeneity in reactions to strategic change, and also to a more nuanced conception of identity threat.

Details

Research in Organizational Change and Development
Type: Book
ISBN: 978-1-78714-436-1

Keywords

1 – 10 of 57