Search results

1 – 10 of over 274000
Article
Publication date: 17 April 2023

Grzegorz Kostro, Michal Michna, Filip Kutt and Roland Ryndzionek

Calculating the stator end-winding leakage inductance, taking into account the rotor, is difficult due to the irregular shape of the end-winding. The end-winding leakage may…

Abstract

Purpose

Calculating the stator end-winding leakage inductance, taking into account the rotor, is difficult due to the irregular shape of the end-winding. The end-winding leakage may distribute at the end of the active part and the fringing flux of the air gap. The fringing flux belongs to the main flux but goes into the end-winding region. Then, not all the magnetic flux occurring in the end region is the end-winding leakage flux. The purpose of this paper was to find a method to accurately separate the leakage from the total flux, taking into account the rotor.

Design/methodology/approach

In this paper, two methods based on energy calculation are presented. Both methods require the assumption that the machine is symmetrical. The first method depends on the total leakage inductance and the machine’s active region length. The second method is based on the energy stored in the end region of the machine. In this case, removing the energy produced by the fringing flux of the air gap is necessary. The model should have a volume-closing fringing flux to remove the part of energy belonging to the end of the air gap.

Findings

The method presented in the paper does not require rotor removal. The values of the end-winding leakage inductance computed based on the proposed method were compared with values computed using the method with the removed rotor. The computations show that the proposed method is closest to the results from the method presented in the literature. Results obtained in the first method present that rotor influence on the value of end-winding leakage inductance exists. The model of the stator end-winding described in the paper is general. Therefore, the proposed methods are suitable for calculating the end-winding leakage inductance of other electric machines.

Originality/value

The method presented in the paper considers the rotor in end-winding leakage inductance calculation. It is not necessary to remove the rotor as in the similar method presented in the literature. The authors elaborated a parametric model with a volume-closing fringing flux to remove the part of energy belonging to the end of the air gap. The authors also elaborated their 3D model of the machine winding for calculations in Opera 3D.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 42 no. 4
Type: Research Article
ISSN: 0332-1649

Keywords

Book part
Publication date: 11 August 2016

Charles P. Cullinan, Xiaochuan Zheng and Elena Precourt

We assess whether smaller investors are more likely to hold shares of closed-end funds that invest more heavily in illiquid securities. We also examine the relationship between…

Abstract

We assess whether smaller investors are more likely to hold shares of closed-end funds that invest more heavily in illiquid securities. We also examine the relationship between the liquidity of the securities held in the portfolios of closed-end mutual funds (portfolio liquidity) and the liquidity of the closed-end funds’ shares (fund-share liquidity). Using a sample of 1,619 fund-years from 2010 to 2012, we find that smaller investors are more likely than institutional investors to own closed-end funds. We also find that the liquidity of closed-end funds’ portfolios is positively associated with the liquidity of the funds’ shares. Our findings are consistent with the “liquidity benefits” notion that closed-end funds are a means for smaller investors to invest in less liquid securities. In addition, our findings are consistent with the “valuation skepticism” notion which indicates that, due to the difficulty of objectively valuing illiquid securities, different perceptions of the value of illiquid securities held in funds’ portfolios may result in greater fund-share liquidity.

Details

The Spread of Financial Sophistication through Emerging Markets Worldwide
Type: Book
ISBN: 978-1-78635-155-5

Keywords

Book part
Publication date: 30 November 2017

Eva Boxenbaum, Thibault Daudigeos, Jean-Charles Pillet and Sylvain Colombero

This chapter examines how proponents of industrialization used multiple modes of communication to socially construct the rational myth of industrialization in the French…

Abstract

This chapter examines how proponents of industrialization used multiple modes of communication to socially construct the rational myth of industrialization in the French construction sector after World War II. We illuminate the respective roles of visual and verbal communication in this process. Our findings suggest that actors construct rational myths according to the following step-by-step method: first, they use visuals to suggest associations between new practices and valuable purposes; then they use verbal text to establish the technical rationality of certain practices; and lastly, they employ both verbal and visual communications to convey their mythical features.

Details

Multimodality, Meaning, and Institutions
Type: Book
ISBN: 978-1-78743-332-8

Keywords

Book part
Publication date: 11 July 2014

Matthew Wood, Chris Welter, Kendall Artz and Steven W. Bradley

Entrepreneurship research has paid little attention to variance in entrepreneurial opportunities, instead choosing to treat them as homogenous. Thus, the field has failed to…

Abstract

Entrepreneurship research has paid little attention to variance in entrepreneurial opportunities, instead choosing to treat them as homogenous. Thus, the field has failed to acknowledge that there are significant variations in means–ends conceptualizations giving rise to different types of opportunities. Further, researchers and educators have not fully considered that the type of opportunity being pursued has implications for which entrepreneurial actions are required to realize a successful outcome. We address these issues in this chapter by distinguishing means–ends combinations such that four types of opportunities – replication, reinterpretation, revelation, and revolution – are introduced. This matrix leads to propositions regarding differing actions that would be emphasized as a function of the type opportunity under consideration (e.g., legitimacy building, knowledge assimilation, market demand, and resource acquisition). The net effect is an improved understanding of how variations in means–ends conceptualizations influence how entrepreneurs interpret their particular opportunity, which in turn drives the actions they take as they attempt to turn their vision into reality. This improved understanding has important implications for entrepreneurship education and we suggests a number of possible changes to pedagogy that flow from our framework. We believe that these changes will bring added richness and value to the classroom.

Details

Innovative Pathways for University Entrepreneurship in the 21st Century
Type: Book
ISBN: 978-1-78350-497-8

Keywords

Book part
Publication date: 12 January 2021

Roger Friedland

In this paper, I compare Theodore Schatzki’s practice theory, the existential phenomenology of Martin Heidegger upon whom Schatzki drew in its formation, and my own theory of…

Abstract

In this paper, I compare Theodore Schatzki’s practice theory, the existential phenomenology of Martin Heidegger upon whom Schatzki drew in its formation, and my own theory of institutional logics which I have sought to develop as a religious sociology of institution. I examine how Schatzki and I both differently locate our thinking at the level of practice. In this essay I also explore the possibility of appropriating Heidegger’s religious ontology of worldhood, which Schatzki rejects, in that project. My institutional logical position is an atheological religious one, poly-onto-teleological. Institutional logics are grounded in ultimate goods which are praiseworthy “objects” of striving and practice, signifieds to which elements of an institutional logic have a non-arbitrary relation, sources of and references for practical norms about how one should have, make, do or be that good, and a basis of knowing the world of practice as ordered around such goods. Institutional logics are constellations co-constituted by substances, not fields animated by values, interests or powers.

Because we are speaking against “values,” people are horrified at a philosophy that ostensibly dares to despise humanity’s best qualities. For what is more “logical” than that a thinking that denies values must necessarily pronounce everything valueless? Martin Heidegger, “Letter on Humanism” (2008a, p. 249).

Details

On Practice and Institution: Theorizing the Interface
Type: Book
ISBN: 978-1-80043-413-4

Keywords

Book part
Publication date: 25 November 2019

Candace Jones, Ju Young Lee and Taehyun Lee

Microfoundations of institutions are central to constructing place – the interplay of location, meaning, and material form. Since only a few institutional studies bring…

Abstract

Microfoundations of institutions are central to constructing place – the interplay of location, meaning, and material form. Since only a few institutional studies bring materiality to the fore to examine the processes of place-making, how material forms interact with people to institutionalize or de-institutionalize the meaning of place remains a black box. Through an inductive and historical study of Boston’s North End neighborhood, the authors show how material practices shaped place-making and institutionalized, or de-institutionalized, the meaning of the North End. When material practices symbolically encoded meanings of diverse audiences into the church, it created resonance and enabled the building’s meanings to withstand environmental change and become institutionalized as part of the North End’s meaning as a place. In contrast, when the material practices restricted meaning to a specific audience, it limited resonance when the environment changed, was more likely to be demolished and, thus, erased rather than institutionalized into the meaning of the North End as a place.

Details

Microfoundations of Institutions
Type: Book
ISBN: 978-1-78769-127-8

Keywords

Book part
Publication date: 15 October 2016

The logical function of accounting ends is that of stimulating and directing appropriate accounting actions as means toward those ends. These ends should be tested for…

Abstract

The logical function of accounting ends is that of stimulating and directing appropriate accounting actions as means toward those ends. These ends should be tested for desirability, whereas the means should be tested for suitability. The pairing of ends and means should be based on realistic and convincing reasons. Furthermore, rather than being expressions of values, account data are symbols of quantitative pictures of overt transaction experience. As such, dual entries express the relationship of an intended effort on the enterprise and the consideration necessary to generate the transaction. A logically coordinated body of accounting theory, along these lines, should generate a logically coordinated body of technical actions.

Details

A. C. Littleton’s Final Thoughts on Accounting: A Collection of Unpublished Essays
Type: Book
ISBN: 978-1-78635-389-4

Abstract

Details

The Natural Economic Science
Type: Book
ISBN: 978-1-78973-220-7

Book part
Publication date: 13 August 2014

Jeroen Meijerink, Joost ten Kattelaar and Michel Ehrenhard

The purpose of this study is to explore the use of shared services by end-users and why this may conflict with the use as intended by the shared service center (SSC) management.

Abstract

Purpose

The purpose of this study is to explore the use of shared services by end-users and why this may conflict with the use as intended by the shared service center (SSC) management.

Methodology/approach

By applying structuration theory, this empirical study draws on qualitative data obtained from semi-structured interviews with managers and end-users of an SSC. This SSC is part of a Dutch subsidiary of a multinational corporation that produces professional electronics for the defense and security market.

Findings

We find two main types of shared services usage by end-users which were not intended by the SSC management: avoidance and window-dressing. These forms of unintended usage were the result of contradictions in social structures related to the centralization and decentralization models as appropriated by end-users and management.

Implications

Our findings show that the benefits of shared services depends on how well contradictions in managers’ and end-users’ interpretive schemes, resources, and norms associated with centralization and decentralization models are resolved.

Originality/value

A popular argument in existing studies is that the benefit of shared services follows from the design of the SSC’s organizational structure. These studies overlook the fact that shared services are not always used as their designers intended and, therefore, that success depends on how the SSC’s organizational structure is appropriated by end-users. As such, the originality of this study is our focus on the way shared services are used by their end-users in order to explain why SSCs succeed or fail in reaping their promised benefits.

Details

Shared Services as a New Organizational Form
Type: Book
ISBN: 978-1-78350-536-4

Keywords

Abstract

Details

Review of Marketing Research
Type: Book
ISBN: 978-0-85724-727-8

1 – 10 of over 274000