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Article
Publication date: 26 September 2019

Gu Xin, Xiao-Ri Liu, Dong-Kang Cheng, Qing-Ping Zheng, Meng-Han Li, Nan-Nan Sun and Chun-Hua Min

This paper aims to investigate the effect of lubricant viscosity model with improver on friction and lubrication of piston skirt-cylinder liner conjunction.

100

Abstract

Purpose

This paper aims to investigate the effect of lubricant viscosity model with improver on friction and lubrication of piston skirt-cylinder liner conjunction.

Design/methodology/approach

A dynamic calculation model is established for the piston skirt-cylinder liner conjunction of a heavy-duty commercial diesel engine, to explore the effects of two kinds of lube oil viscosity models named after polyalkyle-metacrylate-1 (PAMA1) and styrene-isoprene-copolymer (SICP) improvers on the maximum oil film viscosity, the minimum oil film thickness, the peak oil film pressure, the maximum shear rate, the friction force and the total friction power loss.

Findings

The variation trends with the crank angle of the above parameters are not changed with the difference of improvers, while obvious numerical differences are found except the maximum oil film pressure. The minimum oil film thickness and maximum shear rate of PAMA1 are larger than that of SICP, the maximum oil film viscosity of SICP is larger than that of PAMA1, which indicates that the shear-thinning effect of PAMA1 is greater, the maximum friction force on the piston of SICP is larger than that of PAMA1, and the total friction power consumption is also larger, the average friction power consumptions of SICP and PAMA1 are 385.4 and 262.8 W, respectively, with the relative difference of 31.8 per cent.

Originality/value

The influence of different lubricating oil additive models on the lubrication and friction of piston skirt-cylinder liner conjunction is simulated and analyzed.

Details

Industrial Lubrication and Tribology, vol. 72 no. 1
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 11 June 2020

Sylvie Héroux, Anne Fortin and Céline Goupil

This study aims to identify sociocognitive determinants of managers' adherence to the expense report approval control. A behavioral view of control was adopted, drawing on the…

283

Abstract

Purpose

This study aims to identify sociocognitive determinants of managers' adherence to the expense report approval control. A behavioral view of control was adopted, drawing on the theory of planned behavior.

Design/methodology/approach

Managers authorized to approve subordinates' expense reports in three large organizations were surveyed.

Findings

Results indicate that managers' perception of overall consequences (for the organization or for themselves) resulting from their adherence to the expense report approval control (attitude) and their perception of control over the approval (perceived behavioral control) are positively related to their intention to adhere to the expense report approval control, while their perceived pressures from important referents in that matter (subjective norm) are not.

Research limitations/implications

By adopting a behavioral view of control to examine individual-level adherence, this study contributes to the accounting literature. By focusing on a positive response to control (adherence), it contributes specifically to the literature on control effectiveness and acts as a counterpoint to the abundant literature on negative control responses such as fraud.

Practical implications

Results could help organizations identify motivations and barriers to managers' adherence to expense report approval control. This could help reduce losses, improve asset safeguarding and provide insights into the understanding of behavioral/individual factors that can influence the application of other control policies and procedures.

Originality/value

The study defines and measures the “adherence” construct in a control context.

Details

Journal of Applied Accounting Research, vol. 21 no. 3
Type: Research Article
ISSN: 0967-5426

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