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Article
Publication date: 16 August 2021

Bifeng Yin, Xuefeng Wang, Bo Xu, Gongyin Huang and Xin Kuang

The purpose of this paper was to improve the frictional wear resistance properties of piston skirts caused by the low viscosity lubricant by studying the tribological…

Abstract

Purpose

The purpose of this paper was to improve the frictional wear resistance properties of piston skirts caused by the low viscosity lubricant by studying the tribological performance of three novel coating materials.

Design/methodology/approach

Comparative tribological examinations were performed in a tribological tester using the ring-block arrangement under two viscosity lubricants, the loading force was applied as 100 N, the speed was set to 60 r/min and the testing time was 180 min.

Findings

Under low viscosity lubricant, the friction coefficient and wear of the three coatings all increase, and the friction coefficient and wear of the PTFE coating are the largest, while the MoS2 coating has the lowest friction coefficient and wear. Under low viscosity lubricant, the friction coefficient of the MoS2 coating is 2.1%–5.4% and 20.0%–24.3% lower than that of the SiO2 and PTFE coating, respectively. The friction coefficient and wear fluctuation rate of the MoS2 coating is the smallest when the lubricant viscosity decreases, which indicates that the MoS2 coating has excellent stability and adaptability under low viscosity lubricant.

Originality/value

To reduce the piston skirt wear caused by low viscosity lubricant in heavy-duty diesel engines, the friction and wear adaptability of three novel composite coating materials for piston skirts were compared under 0 W-20 low viscosity lubricant, which could provide a guidance for the application of wear-resistant materials for heavy-duty diesel engine piston skirt.

Details

Industrial Lubrication and Tribology, vol. 73 no. 6
Type: Research Article
ISSN: 0036-8792

Keywords

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Article
Publication date: 1 September 2006

Xuefeng Wang and Richard Lihua

This paper seeks to address issues of sustainability in the rapid urbanization in China with examination of knowledge management factors in the creation of new Chinese cities.

Abstract

Purpose

This paper seeks to address issues of sustainability in the rapid urbanization in China with examination of knowledge management factors in the creation of new Chinese cities.

Design/methodology/approach

A case study was undertaken at Zhengdong New District along with semi‐structured interview mixed with evaluation and content analyses of successful knowledge management factors as the analytical approach.

Findings

This study explores the ongoing revolution of building new cities and towns in China, and highlights the importance of knowledge‐based development in achieving sustainable development. Following the establishment of the theory and model of the knowledge city, it explores the features of knowledge city in practice. Focusing on the case study of Zhengdong New District, Zhengzhou, Henan Province, it examines the factors of knowledge management in the creation of the new city. However, it is believed that the strategic development plan was made following the principles of sustainability. Furthermore, it has been accepted that the strategic plan reflexes the framework and sustains various features of the knowledge city, which could be seen as the embryo of knowledge city in China. In the meantime, it has to be recognised that the outcome of the evaluation of Zhengdong New District, which has been discussed in this paper, is merely the audit of what is currently happening in the first phase of the project and reflexes the current issues, and might give impact to the implementation of municipal government strategy in the future.

Originality/value

This paper concludes that, while the local authority is endeavouring to build a physically modern city, it might have overlooked the importance of using knowledge management principles as a tool to promote social, cultural, and environmental sustainability. Yet the analysis in this paper demonstrates that it is not impossible to use knowledge management framework as a tool to assist policy makers governing the creation of a new city in a sustainable way. The discussion in this paper is expected to be thought‐provoking in a holistic understanding of the theoretical perspective of knowledge city and further research into this field in the Chinese context.

Details

Journal of Technology Management in China, vol. 1 no. 3
Type: Research Article
ISSN: 1746-8779

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Article
Publication date: 17 September 2020

Zhe Li and Megan Rainville

The purpose of this study is to examine the relationship between independent director military service and monitoring effectiveness, focusing on chief executive officer…

Abstract

Purpose

The purpose of this study is to examine the relationship between independent director military service and monitoring effectiveness, focusing on chief executive officer (CEO) compensation.

Design/methodology/approach

The authors identify independent directors with military experience using BoardEx data. The authors focus on the level of CEO compensation. The methods used include panel data estimation, propensity score matching analysis and instrumental variable analysis.

Findings

The authors find more powerful CEOs are more likely to appoint independent directors with past military service to the board. Boards with a larger proportion of independent directors with military experience tend to award higher levels of CEO compensation. Moreover, the positive relationship between independent directors with military experience and executive compensation is stronger when the CEO is more powerful.

Originality/value

This paper examines a relatively unexplored director background, directors with military experience, and finds this type of independent director is associated with weak monitoring. The authors contribute to the literature examining the effect of executive and board member military experience on corporations. The authors identify weak monitoring of powerful CEOs as a potential weakness of directors with military experience. This drawback should be considered before appointing a director with military experience to the board.

Details

International Journal of Managerial Finance, vol. 17 no. 4
Type: Research Article
ISSN: 1743-9132

Keywords

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Article
Publication date: 2 August 2019

Chengtao Wang, Wei Li, Yuqiao Wang, Xuefeng Yang, Shaoyi Xu, Kunpeng Li and Yunyun Zhao

The purpose of this paper is to predict quantitative level of stray current leaking to the buried metallic structure by establishing convolution neural network (CNN) model.

Abstract

Purpose

The purpose of this paper is to predict quantitative level of stray current leaking to the buried metallic structure by establishing convolution neural network (CNN) model.

Design/methodology/approach

First, corrosion experimental system of buried metallic structure is established. The research object of this paper is the polarization potential within 110 min, CNN model is used to predict the quantitative level of stray current leakage using the data from corrosion experimental system further. Finally, results are compared with the method using BP neural network.

Findings

Results show that the CNN model has better predictive effect and shorter prediction time than the BP model, the accuracy of which is 82.5507 per cent, and the prediction time is shortened by more than 10 times.

Originality/value

The established model can be used to forecast the level of stray current leakage in the subway system effectively, which provides a new theoretical basis for evaluating the stray current corrosion hazard of buried metallic structure.

Details

Anti-Corrosion Methods and Materials, vol. 66 no. 4
Type: Research Article
ISSN: 0003-5599

Keywords

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Article
Publication date: 4 September 2017

Wang Chengmin, Yang Xuefeng, Cai Xiguang, Ma Tao, Li Yunxi and Song Peilong

This paper aims to thrash out friction and wear properties of automobile brake lining reinforced by lignin fiber and glass fiber in braking process.

Abstract

Purpose

This paper aims to thrash out friction and wear properties of automobile brake lining reinforced by lignin fiber and glass fiber in braking process.

Design/methodology/approach

ABAQUS finite element software was used to analyze thermo-mechanical coupled field of friction materials. XD-MSM constant speed friction testing machine was used to test friction and wear properties of friction material. Worn surface morphology and mechanism of friction materials were observed by using scanning electron microscope.

Findings

The results show that when the temperature was below 350°C, worn mechanism of MFBL was mainly fatigue wear and abrasive wear, and worn mechanism of GFBL was mainly fatigue wear because MFBL contained lignin fiber. Therefore, it exhibits better mechanical properties and friction and wear properties than those of GFBL.

Originality/value

Lignin fiber can improve mechanical properties and friction and wear properties of the automobile brake lining.

Details

Industrial Lubrication and Tribology, vol. 69 no. 5
Type: Research Article
ISSN: 0036-8792

Keywords

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Article
Publication date: 13 November 2017

Xing Wang and Xuefeng Shao

This paper aims to seek the optimal proportion of female executives in corporate management teams, and to analyze the threshold effect of the proportion of female…

Abstract

Purpose

This paper aims to seek the optimal proportion of female executives in corporate management teams, and to analyze the threshold effect of the proportion of female executives on the enterprise market value and enterprise management performance by using a panel threshold regression model. The purpose of this paper is to obtain the optimal interval, during which female executives exert positive effects on enterprise market value and enterprise management performance.

Design/methodology/approach

Based on the data of listed companies in SSE from 2003 to 2012, this paper conducts theoretical and empirical analysis by using a panel threshold regression model.

Findings

This paper proves that the proportion of female executives has a threshold effect on the enterprise market value and enterprise management performance. The results show that the proportion of female executives has an optimal interval. In other words, during the 53.8-68.4 percent interval, the proportion of female executives exerts the least negative effect on the enterprise market value and the most positive effect on the enterprise management performance.

Originality/value

In this paper, the non-linear relationship between female executives, enterprise market value and enterprise management performance has been verified, and the optimization interval of the female executives’ proportion has been figured out as well.

Details

Journal of Organizational Change Management, vol. 30 no. 7
Type: Research Article
ISSN: 0953-4814

Keywords

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Article
Publication date: 8 August 2018

Gang Wang, Xiaohui Liu, Changhong Mi, Huijuan Fan, Bo Xu and Xuefeng Bai

The purpose of this study was to investigate the microstructural evolution and hydrolytic stability of poly(phenylborosiloxane) (PPhBS) to further use and develop the…

Abstract

Purpose

The purpose of this study was to investigate the microstructural evolution and hydrolytic stability of poly(phenylborosiloxane) (PPhBS) to further use and develop the oligomers as heat-resistant modifiers.

Design/methodology/approach

PPhBS was synthesized by direct co-condensation of boric acid (BA) and phenyltriethoxysilane (PTEOS). The structural evolution of PPhBS at high temperature was investigated by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential thermal analysis (DTA), in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and 29Si nuclear magnetic resonance (NMR) spectroscopy. In addition, the change in the morphology of the PPhBS powder was examined to demonstrate the evolution of the chemical bonds, and the hydrolytic stability of PPhBS was investigated by a combination of X-ray diffraction (XRD) analysis, measurement of the mass loss in water and FTIR spectroscopy.

Findings

The results revealed that a cross-linking network was gradually formed with increasing temperature through the condensation of the residual hydroxyl groups in PPhBS, and the Si-OH and B-OH bonds remained even at a high temperature of 450°C. Furthermore, heat treatment improved the hydrolytic stability of the oligomer. The hydrolysis of the B-O-B bonds in PPhBS was reversible, whereas the Si-O-Si and Si-O-B bonds were highly resistant to hydrolysis.

Practical implications

The prepared PPhBS can be used as a heat-resistant modifier in adhesives, sealants, coatings and composite matrices.

Originality/value

Investigation of the structural evolution of a polyborosiloxane at high temperature by DRIFTS is a novel approach that avoided interference from moisture in the air. The insoluble mass fraction and the FTIR spectrum of PPhBS washed with water were used to investigate the hydrolytic stability of PPhBS.

Details

Pigment & Resin Technology, vol. 47 no. 4
Type: Research Article
ISSN: 0369-9420

Keywords

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Article
Publication date: 25 January 2013

Xuejun Wang, Koshi Maeda and Xuefeng Mao

This paper aims to determine whether domestic cotton support permitted by the current or potential World Trade Organization (WTO) rules would be sufficient to compensate…

Abstract

Purpose

This paper aims to determine whether domestic cotton support permitted by the current or potential World Trade Organization (WTO) rules would be sufficient to compensate the cost to China's cotton farmers if the sliding scale duty (SSD) on cotton imports is removed.

Design/methodology/approach

The simulation was conducted using a static spatial equilibrium model (SEM) of the world cotton market. First, a base model was specified to provide a good representation of the world cotton market's conditions. Second, simulations were conducted to evaluate the effects of replacing the SSD and subsidizing cotton producers pursuant to the current or potential WTO rules on domestic cotton support.

Findings

The results of the simulations suggest that China's cotton farmers are bound to incur losses. In either case, cotton subsidies permitted by the current or potential WTO rules are not sufficient to compensate for the cost to China's cotton producers if the SSD is eliminated.

Research limitations/implications

It should be pointed out that these findings could suffer from a bias, primarily because the authors assumed that the WTO's blue box subsidies have no incentives for farmers to produce, and no substitution between cotton and alternative products. Thus, additional work is needed to reflect a more realistic situation in future studies.

Originality/value

The simulation estimation contributes to a better understanding of the issue of whether China should replace the current SSD with cotton subsidies to protect cotton producers.

Details

China Agricultural Economic Review, vol. 5 no. 1
Type: Research Article
ISSN: 1756-137X

Keywords

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Article
Publication date: 7 September 2010

Xiaoyun Liu, Wanchun Luo, Xuefeng Mao, Xiuqing Wang and Xian Xin

The paper aims to assess the impact of agricultural output changes on the general price level over time with China as an example.

Abstract

Purpose

The paper aims to assess the impact of agricultural output changes on the general price level over time with China as an example.

Design/methodology/approach

A simple numerical global general equilibrium (GE) model of two regions (China and the rest of the world) and three commodities (agriculture, manufacturing goods, and services) is used to assess the impacts of agricultural output changes on the overall economy price changes. The numerical GE model of this paper consists of production, final consumption, and market clear conditions. The results are generated with the GE model calibrated to aggregated China's input‐output tables of 1987, 1997, and 2005.

Findings

The results suggest that China witnessed a declining influence of agricultural output changes on general price changes. The contribution of given agricultural output change on the general price change in 2005 was merely less than 60 percent of that in 1987, which in turn implies that macro policies targeting to curb general inflation via boosting agricultural output will be less effective as those of 20 years ago.

Practical implications

China's policy makers should rely less and less on promoting agricultural output policies to fight against general inflation and should resort to non‐agricultural policies.

Originality/value

The paper argues that the influence of agriculture on the China's general price indices has been weakening along with China's economic development with a numerical GE model calibrated to aggregated China's input‐output tables of 1987, 1997, and 2005.

Details

China Agricultural Economic Review, vol. 2 no. 3
Type: Research Article
ISSN: 1756-137X

Keywords

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Article
Publication date: 1 June 2015

Fen Liu, Xuefeng Zhao, Patrick Y.K. Chau and Qing Tang

The purpose of this paper is to examine how consumers’ value evaluation and personality factors influence consumers’ intention to adopt mobile coupon (M-coupon…

Abstract

Purpose

The purpose of this paper is to examine how consumers’ value evaluation and personality factors influence consumers’ intention to adopt mobile coupon (M-coupon) applications in China. The moderating effect of gender on the relationships between personality factors and consumers’ adoption intention is also tested.

Design/methodology/approach

This study conducted a survey to collect data from M-coupon application users. In total, 271 valid responses were analyzed using structural equation modeling (SEM) technology.

Findings

The results indicate that perceived value, personal innovativeness, and coupon proneness positively affect consumers’ acceptance of M-coupon applications. Personal innovativeness has more positive impact on behavioral intention for males than for females. However, the differential effects of coupon proneness on behavioral intention are not significant between males and females. In addition, the findings show that perceived convenience, perceived enjoyment, and perceived money savings positively influence perceived value, whereas perceived fees and perceived privacy risk negatively influence it.

Practical implications

This study helps M-coupon application providers to identify who is positive toward their services and how to improve consumers’ perceived value of the services, eventually expanding their user base.

Originality/value

Prior studies mainly focussed on the usage behavior of M-coupons and overlooked the important role of M-coupon applications in promoting M-coupon use. This research fills this gap. The research findings offer insights into the factors influencing consumers’ behavioral intention to adopt M-coupon applications. Besides, the results of gender’s moderating effect advance the understanding of the differences in males’ coupon usage intentions between the contexts of M-coupon applications and paper-based coupon services, which enrich couponing research.

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