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Article
Publication date: 4 February 2014

Sheri Kurgin, Jean M. Dasch, Daniel L. Simon, Gary C. Barber and Qian Zou

The purpose of this paper is to compare the performance of single- and dual-channel minimum quantity lubrication (MQL) for reaming spool bores in an automotive transmission valve…

500

Abstract

Purpose

The purpose of this paper is to compare the performance of single- and dual-channel minimum quantity lubrication (MQL) for reaming spool bores in an automotive transmission valve body.

Design/methodology/approach

Machining experiments are conducted under various parameters for both single- and dual-channel MQL. Comparison metrics include part surface temperature, spindle power consumption and hole quality. Experimental data from traditional through-tool flood coolant are provided as a baseline for spindle power consumption and part quality.

Findings

The results show that with proper tooling and machining parameters, dual-channel MQL can perform equivalently or better than flood coolant. Single-channel MQL was not deemed suitable for this machining application.

Practical implications

The results of the study show that MQL can be successfully applied for precision reaming of aluminum and can provide guidance in developing an MQL system.

Originality/value

Few studies have been performed for reaming holes in general, and very few studies have been performed for reaming with MQL. Reaming is a critical operation used to create holes with precise quality. No study was found in the literature review that directly compared the performance of single- and dual-channel MQL delivery systems.

Details

Industrial Lubrication and Tribology, vol. 66 no. 1
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 21 September 2012

Sheri Kurgin, Jean M. Dasch, Daniel L. Simon, Gary C. Barber and Qian Zou

The purpose of this paper is to evaluate the cooling ability of minimum quantity lubrication (MQL) cutting fluid.

1243

Abstract

Purpose

The purpose of this paper is to evaluate the cooling ability of minimum quantity lubrication (MQL) cutting fluid.

Design/methodology/approach

An experimental system is devised to find the heat transfer coefficient of MQL under simulated reaming conditions. Cooling rate of the specimen is measured with an infrared camera. The effect of air pressure and oil volume on cooling rate is tested. Metal cutting tests are performed to evaluate the effect of heat transfer coefficient on workpiece temperature.

Findings

Convective heat transfer coefficient for MQL increases with increasing air pressure. Oil volume has an indeterminate effect on the heat transfer coefficient; however, it is a dominant factor for controlling temperature during reaming.

Practical implications

The results of the study can provide guidance to optimize the temperature controlling ability of MQL for production.

Originality/value

There is limited information available in literature regarding the heat transfer coefficient of metal working fluids, particularly for MQL. In particular, experiments designed to investigate the effect of air pressure and oil volume on the heat transfer coefficient of the mist have not been previously documented. This information may be used to improve the overall cooling ability of MQL mist, thus increasing its effectiveness at controlling tool wear and maintaining part quality. The other major contribution of this work is to separate the role of the cooling and lubrication for controlling temperature while reaming aluminum. Prior to this study, there has been relatively little research performed for the reaming metal cutting operation, and still less for reaming with MQL. The nature of how metal working fluids control temperature is not fully understood, and this work provides insight as to whether cooling or lubrication plays the dominant role for reaming.

Details

Industrial Lubrication and Tribology, vol. 64 no. 6
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 15 March 2010

Rebecca Checkley, Nick Hodge, Sue Chantler, Lisa Reidy and Katie Holmes

This paper focuses on accessing the experiences of three boys who are on the autism spectrum to identify what using a voice output communication aid (VOCA), within a classroom…

352

Abstract

This paper focuses on accessing the experiences of three boys who are on the autism spectrum to identify what using a voice output communication aid (VOCA), within a classroom setting, means to them. The methods used to identify the boys' perspectives are described and evaluated. Establishing these through direct methods of engagement proved problematic but working with parents and school staff as ‘expert guides’ provided a rich insight into what using a VOCA appeared to mean to the boys. The findings suggest that using a computer‐based VOCA can be viewed by children with autism as a pleasurable and motivating activity. This technology also seems to offer the potential for a much broader developmental impact for these children than that currently recognised within the research literature.

Details

Journal of Assistive Technologies, vol. 4 no. 1
Type: Research Article
ISSN: 1754-9450

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Article
Publication date: 11 January 2022

Binbin Su, Xianghe Zou and Lirong Huang

This paper aims to investigate the squeeze film lubrication properties of hexagonal patterned surface inspired by the epidermis structure of tree frog’s toe pad and numerically…

174

Abstract

Purpose

This paper aims to investigate the squeeze film lubrication properties of hexagonal patterned surface inspired by the epidermis structure of tree frog’s toe pad and numerically explore the working mechanism of hexagonal micropillar during the acquisition process of high adhesive and friction for wet contacts.

Design/methodology/approach

A two-dimensional elastohydrodynamic numerical model is employed for the squeezing contacts. The pressure distribution, load carrying capacity and liquid flow rate of the squeeze film are obtained through a simultaneous solution of the two-dimensional Reynolds equation and elasticity deformation equations.

Findings

Higher pressure is found to be longitudinally distributed across individual hexagonal pillar, with pressure peak emerging at the center of hexagonal pillar. Expanding the area density and shrinking the channel depth or initial film thickness will improve the magnitude of squeezing pressure. Relatively lower pressure is generated inside interconnected channels, which reduces the load carrying capacity of the squeeze film. Meanwhile, the introduction of microchannel is revealed to downscale the total mass flow rate of squeezing contacts.

Originality/value

This paper provides a good proof for the working mechanism of surface microstructures during the acquisition process of high adhesive and friction for wet contacts.

Details

Industrial Lubrication and Tribology, vol. 74 no. 1
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 1 April 2003

Georgios I. Zekos

Aim of the present monograph is the economic analysis of the role of MNEs regarding globalisation and digital economy and in parallel there is a reference and examination of some…

101260

Abstract

Aim of the present monograph is the economic analysis of the role of MNEs regarding globalisation and digital economy and in parallel there is a reference and examination of some legal aspects concerning MNEs, cyberspace and e‐commerce as the means of expression of the digital economy. The whole effort of the author is focused on the examination of various aspects of MNEs and their impact upon globalisation and vice versa and how and if we are moving towards a global digital economy.

Details

Managerial Law, vol. 45 no. 1/2
Type: Research Article
ISSN: 0309-0558

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Article
Publication date: 1 April 1977

THE Reference Department of Paisley Central Library today occupies the room which was the original Public Library built in 1870 and opened to the public in April 1871. Since that…

432

Abstract

THE Reference Department of Paisley Central Library today occupies the room which was the original Public Library built in 1870 and opened to the public in April 1871. Since that date two extensions to the building have taken place. The first, in 1882, provided a separate room for both Reference and Lending libraries; the second, opened in 1938, provided a new Children's Department. Together with the original cost of the building, these extensions were entirely financed by Sir Peter Coats, James Coats of Auchendrane and Daniel Coats respectively. The people of Paisley indeed owe much to this one family, whose generosity was great. They not only provided the capital required but continued to donate many useful and often extremely valuable works of reference over the many years that followed. In 1975 Paisley Library was incorporated in the new Renfrew District library service.

Details

Library Review, vol. 26 no. 4
Type: Research Article
ISSN: 0024-2535

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Article
Publication date: 1 April 1973

Current issues of Publishers' Weekly are reporting serious shortages of paper, binders board, cloth, and other essential book manufacturing materials. Let us assure you these…

144

Abstract

Current issues of Publishers' Weekly are reporting serious shortages of paper, binders board, cloth, and other essential book manufacturing materials. Let us assure you these shortages are very real and quite severe.

Details

Reference Services Review, vol. 1 no. 4
Type: Research Article
ISSN: 0090-7324

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Book part
Publication date: 1 January 2005

Lan Xia and Kent B. Monroe

Abstract

Details

Review of Marketing Research
Type: Book
ISBN: 978-0-85724-723-0

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Article
Publication date: 30 November 2012

Rebecca Checkley, Lisa Reidy, Sue Chantler, Nick Hodge and Katie Holmes

This naturalistic study adapted exploratory school practice in order to support empirically‐informed decision making in the provision of augmentative and alternative communication…

667

Abstract

Purpose

This naturalistic study adapted exploratory school practice in order to support empirically‐informed decision making in the provision of augmentative and alternative communication (AAC) technologies for children with autism.

Design/methodology/approach

Research was conducted with three boys with autism and little speech, as part of a curricular literacy lesson. A mixed method approach, involving observational coding and staff diaries, identified how the boys used computer‐based voice output communication aids (VOCAs), also called speech generating devices (SGDs) and how the technology impacted on their communication and language. The boys were observed in initial lessons (“baseline” sessions), without the VOCA present and in sessions in which the VOCA was available (“intervention” sessions).

Findings

VOCAs were used for two main communicative purposes; naming and giving information, with aids being used primarily to support curricular, task‐related communication. Existing modes of communication continued to be used when access to the VOCA was available. In addition, all three boys showed an increase in Mean Length of Utterance (MLU) after the VOCA was introduced. The findings suggest that computer‐based VOCA technology can augment children's communicative participation in lesson activities. Specific patterns of change were also recorded in the boys' communication, suggesting individualised responses to this technology.

Originality/value

This paper extends the empirical base for clinical decision making by reporting the use of high tech VOCAs by school age children with autism for additional forms of communication, beyond those described elsewhere. It adds to the evidence that interventions which include access to a computer VOCA can have a positive impact on the language complexity of children with autism. It describes the potential of VOCAs to provide an enabling and inclusive technology in a classroom setting.

Details

Journal of Assistive Technologies, vol. 6 no. 4
Type: Research Article
ISSN: 1754-9450

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Article
Publication date: 1 February 2003

Daniel M. Shapiro, Eric Gedajlovic and Carolyn Erdener

Much of the extant literature on the Chinese Family Firm highlights the unique cultural heritage and social context in which they are embedded as primary determinants of their…

1000

Abstract

Much of the extant literature on the Chinese Family Firm highlights the unique cultural heritage and social context in which they are embedded as primary determinants of their strategic behavior. In contrast, few studies have examined the strategic behavior of Chinese Family Firms from an economic perspective. In this paper, we address this gap in the literature by applying Dunning's eclectic theory of the MNE to the Chinese Family Firm. In doing so, we generate a series of testable propositions. We suggest that although the strategic behavior of Chinese Family Firms will differ significantly from those of classic Western MNEs, they are nonetheless amenable to interpretation according to Dunning's analytical constructs of ownership (O), internalization (I) and locational (L) advantages. More specifically, we find that like the classic Western MNE, the Chinese Family Firm can be understood as a viable mechanism for capitalizing on particular configurations of OLI advantages in international markets.

Details

The International Journal of Organizational Analysis, vol. 11 no. 2
Type: Research Article
ISSN: 1055-3185

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