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1 – 10 of over 2000
Article
Publication date: 1 March 1993

C.C. LEE and D.H. CHIEN

An integration algorithm for effective and accurate integration of the Fourier—Bessel integral temperature solution of a five‐layer structure with a circular embedded source is…

Abstract

An integration algorithm for effective and accurate integration of the Fourier—Bessel integral temperature solution of a five‐layer structure with a circular embedded source is reported. The circular source solution has the form of a single integration rather than the double integration of a solution for the structure with a rectangular source. Using the circular source solution, the computation time for temperature calculation is reduced by a factor of 10 compared with the rectangular source solution. To reduce the computation time further, this integration algorithm transforms the single integration into a fast‐converging simple summation. The effectiveness of this algorithm is most evident when the point of calculation is far from the source. Based on the solution and algorithm, a software program PAMICE has been written. An important application for the solution and integration algorithm is the use of a circular source instead of a square one as unit source to produce the unit thermal profile for real‐time thermal design of integrated circuits having large number of sources. The solution is also valuable for the thermal study and analysis of devices having circular sources such as power transistors and light emitting diodes. The algorithm can be applied to other similar solutions arising from structures with circular sources.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 12 no. 3
Type: Research Article
ISSN: 0332-1649

Article
Publication date: 4 July 2016

Moses M. Solomon, Saviour A. Umoren, Aniekemeabasi U. Israel and Idongesit G. Etim

The purpose of this paper is to evaluate the performance of polypropylene glycol (PPG), as a corrosion inhibitor for aluminium corrosion in 0.5 M H2SO4 solution at 303-333 K and…

Abstract

Purpose

The purpose of this paper is to evaluate the performance of polypropylene glycol (PPG), as a corrosion inhibitor for aluminium corrosion in 0.5 M H2SO4 solution at 303-333 K and the effect of addition of iodide ions on the corrosion inhibition efficacy of PPG.

Design/methodology/approach

The corrosion inhibition performance of PPG alone and on addition of iodide ions in the acid medium was evaluated using weight loss and electrochemical [electrochemical impedance spectroscopy (EIS), linear polarisation resistance (LPR) and potentiodynamic polarization (PDP)] methods as well as surface analysis approach at 303-333 K. The morphology of the corroding aluminium surface without and with the additives was visualised using scanning electron microscopy (SEM). The trend of inhibition efficiency with temperature was used to propose the mechanism of inhibition and type of adsorption.

Findings

Results obtained showed that PPG moderately retarded the corrosion of Al in 0.5 M H2SO4 solution. Addition of KI to PPG is found to synergistically improve the inhibitive ability of PPG. From the variation of inhibition efficiency, K_ads, and E_a, with rise in temperature, physisorption mechanism is proposed for the adsorption of PPG and PPG + KI onto the Al surface in 0.5 M H2SO4 solution. Polarisation results showed that PPG and PPG + KI acted as mixed type inhibitor. The adsorption of PPG and PPG + KI, respectively, onto the metal surface followed El-Awady et al. adsorption isotherm model. SEM and water contact angle analysis confirmed the adsorption of PPG and PPG + KI on Al surface.

Research limitations/implications

The research is limited to aqueous acid environment in aerated condition, and all tests were performed under static conditions.

Practical implications

The use of PPG as corrosion inhibitor for Al corrosion in acidic medium were reported for the first time. The results suggest that iodide ions could be used to enhance corrosion protection ability of PPG which could find practical application in corrosion control in aqueous acidic environment. The data obtained would form part of database on the synergistic effect of iodide ions addition to polymer to control acid-induced corrosion of metal.

Originality/value

The use of PPG as corrosion inhibitor for Al corrosion in acidic medium were reported for the first time. The results suggest that iodide ions could be used to enhance corrosion protection ability of PPG which could find practical application in corrosion control in aqueous acidic environment. The data obtained would form part of database on the synergistic effect of iodide ions addition to polymer to control acid-induced corrosion of metal.

Details

Pigment & Resin Technology, vol. 45 no. 4
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 22 May 2007

Michael Robinson

The purpose of this paper is to offer a number of reflections based on the personal experience of working as a librarian in Vietnam.

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Abstract

Purpose

The purpose of this paper is to offer a number of reflections based on the personal experience of working as a librarian in Vietnam.

Design/methodology/approach

The approach is subjective and is based on the author's observations and conclusions as a project consultant to several philanthropic projects in Vietnam.

Findings

The paper briefly describes these library projects and then discusses some of the more significant professional and personal challenges and rewards they involved.

Practical implications

The paper provides some practical guidance on approaches to project management across cultures and on issues specific to library project management and consulting in Vietnam.

Originality/value

The paper is both a contribution to the small body of literature on the impact of philanthropic assistance and projects on libraries in Vietnam, as well as a personal narrative on the experience of working as a professional librarian in another culture.

Details

Library Management, vol. 28 no. 4/5
Type: Research Article
ISSN: 0143-5124

Keywords

Article
Publication date: 1 February 2000

W.B. Tsai, W.W. Lin and C.C. Chieng

This study evaluates low Reynolds number models of turbulence for numerical computations on the heat transfer and fluid flow behavior in a rectangular channel with…

Abstract

This study evaluates low Reynolds number models of turbulence for numerical computations on the heat transfer and fluid flow behavior in a rectangular channel with streamwise‐periodic ribs mounted on one of the principal walls. The models include k − ε models of Launder and Sharma (1974), Chien (1982), k − ε model of Lin and Hwang (1998), Wilcox’s k−ω model (Wilcox, 1994) and Durbin’s model k − ε −v2 (Durbin, 1995). The numerical results show that all these models can predict the flowfield reasonably well, and the inclusion of the Yap term (Yap, 1987) in the ε – equation (or ε – equation) can further improve the prediction in these k − ε models, k − ε model and k − ε − v2 model. However, these models behave differently in heat transfer computations. The k − ω model leads to too low a level of heat transfer and turbulence. Among these k − ε models and the k − ε model, Lin’s model with the Yap term predicts the heat transfer level best. Durbin’s model with extra v2, f equations and the Yap term exhibits further improvement.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 10 no. 1
Type: Research Article
ISSN: 0961-5539

Keywords

Article
Publication date: 1 February 1996

Jaroslav Mackerle

Presents a review on implementing finite element methods on supercomputers, workstations and PCs and gives main trends in hardware and software developments. An appendix included…

Abstract

Presents a review on implementing finite element methods on supercomputers, workstations and PCs and gives main trends in hardware and software developments. An appendix included at the end of the paper presents a bibliography on the subjects retrospectively to 1985 and approximately 1,100 references are listed.

Details

Engineering Computations, vol. 13 no. 1
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 10 October 2016

Hsiu-Chuan Lee, Chih-Hsiang Hsu and Cheng-Yi Chien

The purpose of this paper is to investigate volatility spillovers across the interest rate swap markets of the G7 economies, and then the authors investigate whether spillovers of…

Abstract

Purpose

The purpose of this paper is to investigate volatility spillovers across the interest rate swap markets of the G7 economies, and then the authors investigate whether spillovers of swap markets contain useful information to explain subsequent stock price movements.

Design/methodology/approach

This study uses the short- and long-term swap spread volatility of the G7 countries to explore the spillover effects of international swap markets, and then investigates the relationship between swap and stock markets. The authors use the generalized VAR approach suggested by Diebold and Yilmaz (2012) to study spillovers of international swap markets. The Granger-causality tests are employed to examine the linkage of interest rate swap and stock markets.

Findings

This paper shows that a moderate spillover effect exists for the short- and long-term swap markets. Moreover, the results show that the short- and long-term swap markets of France and Germany have a larger impact on other countries’ swap markets than that of other countries’ swap markets on the French and German swap markets. Finally, the results indicate that the total volatility spillovers for the long-term swap markets have a larger influence on the total volatility spillover index of stock markets and the global stock market volatility than that of the short-term swap markets.

Originality/value

Prior literature has used impulse response and variance decomposition analyses to investigate international swap markets linkages. However, the results depend on the ordering of variables. This study uses the framework of Diebold and Yilmaz (2012) to overcome the ordering issue, and thus the authors can compute directional spillovers. This paper is the first study to explore the linkage of the total volatility spillover of swap markets and the stock markets.

Details

Managerial Finance, vol. 42 no. 10
Type: Research Article
ISSN: 0307-4358

Keywords

Article
Publication date: 11 April 2016

Robert Gregory

The purpose of this paper is to discuss the causes and circumstances of what has become systemic corruption in Vietnam, and the reasons why the moves taken by the regime to combat…

Abstract

Purpose

The purpose of this paper is to discuss the causes and circumstances of what has become systemic corruption in Vietnam, and the reasons why the moves taken by the regime to combat it have been largely ineffective so far.

Design/methodology/approach

The paper offers a commentary based on published secondary sources.

Findings

The paper concludes that the immediate prospects for any substantial reduction in the level of corruption in Vietnam appear to be bleak. Endemic corruption, especially in the form of elite rent-seeking, is likely to remain strong. However, the paper sketches two more possible scenarios on anti-corruption prospects in the country for the intermediate future.

Originality/value

The paper relies on secondary sources in providing a macro-level discussion of corruption in Vietnam.

Details

Asian Education and Development Studies, vol. 5 no. 2
Type: Research Article
ISSN: 2046-3162

Keywords

Book part
Publication date: 9 June 2022

Sylvia Nabila Azwa Ambad

Social entrepreneurship has played a significant role in reducing unemployment and poverty, fixing other social issues and environmental concerns. Although there is an increasing…

Abstract

Social entrepreneurship has played a significant role in reducing unemployment and poverty, fixing other social issues and environmental concerns. Although there is an increasing concern on social entrepreneurship by the public sector, practitioner and scholars, there are still limited studies on predicting the intention to become a social entrepreneur. Thus, investigating social entrepreneurship intention using a systematic literature review (SLR) approach is crucial due to the lack of systematisation and categorisation in this field. Therefore, this study aims to conduct a SLR to identify the antecedents of social entrepreneurial intention (SEI) used by the previous research. In this sense, this chapter carries out a systematic review of the literature on social entrepreneurship intentions. The review is guided by the PRISMA Statement (Preferred Reporting Items for Systematic reviews and Meta-Analyses). After the identification and screening process, only 56 articles were qualified for further analysis. This SLR focused on articles that are using quantitative research and in the English language published in Scopus. Although there is no limitation in the timeline, the search string results found that the related articles were published between 2010 and 2020. From the thematic analysis, nine main themes were found. The themes are categorised based on the antecedents of SEI used by previous research. There are nine antecedents found: (1) perceived desirability and feasibility, (2) attitude, subjective norms and perceived behavioural control, (3) prior experience, (4) emotional factors, (5) self-efficacy, (6) personality, (7) support systems, (8) skills and competencies and (9) motivational factors. Further analysis of the themes has resulted in ten sub-themes. This chapter's contribution includes offering a clearer picture of the antecedents of social entrepreneurial intention that is still at its infancy stage. Additionally, this chapter managed to identify the research gaps and proposed future research agenda.

Article
Publication date: 16 June 2021

Mao-Feng Kao, Min-Jeng Shiue and Chien-Hao Tseng

This study aims to examine the Taiwan setting, where audit partners’ names are presented in the audit report and where audit committee formation is voluntary in the initial stage…

Abstract

Purpose

This study aims to examine the Taiwan setting, where audit partners’ names are presented in the audit report and where audit committee formation is voluntary in the initial stage of audit committee reform. This paper investigates the effects of the formation of voluntary audit committees on the selection of individual audit partners, and, in turn, the audit quality. This contrasts with previous studies investigating the relationship between audit committees and auditor selection at the audit firm level.

Design/methodology/approach

This paper samples all of Taiwan’s publicly listed firms for the period 2007–2012 and uses Heckman’s (1979) two-stage estimation model to achieve our objectives.

Findings

Using different characteristics of individual engagement partners as proxies for a higher quality auditor, the main empirical results show that voluntary audit committee formation is positively related to an industry specialist lead partner and a lead partner that has a larger number of clients. In addition, this paper also finds that voluntary audit committee formation has a positive impact on audit quality (proxied by discretionary accruals). The results suggest that the voluntary formation of an audit committee contributes positively to both auditor selection and audit quality. Furthermore, an additional test shows that the main empirical results are robust to a validity threat that firms that have good corporate governance prior to the formation of voluntary audit committees tend to select high-quality audit partners.

Originality/value

The paper contributes to the audit committee literature in the following ways: this paper takes advantage of Taiwan’s unique setting, where forming an audit committee is not compulsory in the initial stage of audit committee reform, to investigate the voluntary audit committee, auditor selection and audit quality; this paper expands on Abbott and Parker’s (2000) study of audit committee characteristics and auditor selection at the audit firm level by examining this relationship at the individual audit partner level; this paper responds to the call by Church et al. (2008) and DeFond and Francis (2005) who propose more studies on audit quality at the individual engagement partner level.

Details

Managerial Auditing Journal, vol. 36 no. 4
Type: Research Article
ISSN: 0268-6902

Keywords

Book part
Publication date: 30 November 2020

Edem M. Azila-Gbettor, Robert J. Blomme, Ad Kil and Ben Q. Honyenuga

The study examines organization citizenship behavior (OCB) as a mediating variable between instrumental work values (IWVs) and organizational performance; and group differences…

Abstract

The study examines organization citizenship behavior (OCB) as a mediating variable between instrumental work values (IWVs) and organizational performance; and group differences between family manager and nonfamily manager for integrated models in family hotels. Data were collected from 189 hotels (n = 921) ranging from budget to three-star family hotels in Ghana using questionnaire administered conveniently. Data were analyzed using structural equation modeling. Work value positively influences OCB and organizational performance of family hotels. OCB mediates the relationship between work values and organizational performance. The study also found significant support for group differences between family and nonfamily firms for IWVs and mediating effect of OCB on the relationship between IWVs and performance.

1 – 10 of over 2000