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Article
Publication date: 8 January 2018

Yun He, Fanghong Sun and Xuelin Lei

This study aims to obtain diamond-coated mechanical seals with improved sealing performance and considerable cost. To achieve this purpose, the study focuses on depositing…

Abstract

Purpose

This study aims to obtain diamond-coated mechanical seals with improved sealing performance and considerable cost. To achieve this purpose, the study focuses on depositing uniform, wear-resistant and easily polished diamond coatings on massive mechanical seals in a large-scale vacuum chamber.

Design/methodology/approach

The computational fluid dynamics simulation test and its corresponding deposition experiment are carried out to improve the uniformity of diamond films on massive mechanical seals. The polishing properties and sealing performance of mechanical seals coated with three different diamond films (microcrystalline diamond [MCD], nanocrystalline diamond [NCD] and microcrystalline/nanocrystalline diamond [MNCD]) and uncoated mechanical seals are comparatively studied using the polishing tests and dynamic seal tests to obtain the optimized diamond coating type on the mechanical seals.

Findings

The substrate rotation and four gas outlets distribution are helpful for depositing uniform diamond coatings on massive mechanical seals. The MNCD-coated mechanical seal shows the advantages of high polishing efficiency in the initial polishing process and excellent wear resistance and self-lubrication property in the follow-up polishing period because of its unique composite diamond film structures. The MNCD-coated mechanical seal shows the longest working life under dry friction condition, about 14, 1.27 and 1.9 times of that for the uncoated, MCD and NCD coated mechanical seals, respectively.

Originality/value

The effect of substrate rotation and gas outlets distribution on temperature and gas flow field during diamond deposition procedure is simulated. The MNCD-coated mechanical seal exhibits a superior sealing performance compared with the MCD-coated, NCD-coated and uncoated mechanical seals, which is helpful for decreasing the operating system shut-down frequency and saving operating energy consumption.

Details

Industrial Lubrication and Tribology, vol. 70 no. 1
Type: Research Article
ISSN: 0036-8792

Keywords

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Article
Publication date: 8 May 2018

Ling-Yun He, Bingdong Hou and Hua Liao

Rural energy policy is a critical measure to fight the long-standing poverty issue in China. Energy poverty, per se, is one important yet too often neglected dimension of…

Abstract

Purpose

Rural energy policy is a critical measure to fight the long-standing poverty issue in China. Energy poverty, per se, is one important yet too often neglected dimension of poverty, and one of the biggest challenges in rural China during the 40-year rural reform. Reducing energy poverty is one of the poverty alleviation tasks and the goals of energy transition in the rural areas. The purpose of this paper is to evaluate the status of energy poverty in China, discussing the challenges of energy poverty reduction, and then proposing the potential measures.

Design/methodology/approach

Using various data (including the authors’ survey data), this paper analyzes the volume and structure of energy use, and affordability of energy for the rural households, then examines the impacts of energy poverty on health, social and productivity, and finally discusses the infrastructure, cognitive ability, culture, income, etc., that shape the challenges to energy poverty reduction.

Findings

In addition to raising the household income, it is urgently needed to enforce the collaborations among government departments, and to improve the energy infrastructure according to local conditions, helping the residential environment cognition.

Originality/value

Energy poverty is almost a too often neglected issue in rural China. Few in existing literature comprehensively investigate this critically important social economic problem. This paper contributes to the profound understanding in energy poverty and the possible approaches to alleviate it.

Details

China Agricultural Economic Review, vol. 10 no. 2
Type: Research Article
ISSN: 1756-137X

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Article
Publication date: 4 November 2013

Ilhong Yun, Seung-Gon Kim, Sejong Jung and Shahin Borhanian

Using a sample of male police officers in South Korea, the purpose of this paper is to examine whether police stressors revealed in the western literature are also…

Abstract

Purpose

Using a sample of male police officers in South Korea, the purpose of this paper is to examine whether police stressors revealed in the western literature are also applicable in the South Korean context.

Design/methodology/approach

Officers stationed at 16 frontline substations in a large metropolitan city reported the frequency with which they had been exposed to seven classes of police stressors and perceived somatization symptoms.

Findings

Work-family conflict and victimization at the hands of citizens were revealed as the significant predictors of officers’ stress-related somatization symptoms. Unlike western studies, the present study did not reveal moderating effects of coping strategies and social support. Stressors’ effects on somatization symptoms, however, were mediated by destructive coping strategies.

Originality value

This study contributes to the comparative literature on police stress.

Details

Policing: An International Journal of Police Strategies & Management, vol. 36 no. 4
Type: Research Article
ISSN: 1363-951X

Keywords

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Article
Publication date: 22 February 2021

Bai Yun, Zhao Yue and Zhou Yaolin

This study aims to identify the prominent topics, the distribution and association characteristics of topics and the topic evolutionary trends of Documentary Heritage…

Abstract

Purpose

This study aims to identify the prominent topics, the distribution and association characteristics of topics and the topic evolutionary trends of Documentary Heritage Preservation and Conservation (DHPAC) research in China.

Design/methodology/approach

Keywords of relevant papers in China National Knowledge Infrastructure (CNKI) were extracted as the data source in this study. First, frequency and co-occurrence of keywords of the selected papers were obtained by using SATI. Second, co-word network indicators were calculated with the Pajek software. Then, VOSviewer was applied to optimize the visualization of the sub-communities. Finally, a topics evolution map of this research field was implemented by CorTexT.

Findings

The research topics of DHPAC research in China were unbalanced but distinct. Topics of DHPAC research in China possessed inconspicuous orientation and consistency. The core topics had less influence on the overall network. A research system had formed with archival conservation and ancient books conservation as the core research directions. Research in this field had formed four continuous evolutionary paths about ancient books conservation, salvage conservation, archival conservation and archives conservation technology science with topics fusion and differentiation coexisting. Attentions on “ancient books conservation”, “paper relics conservation”, “electronic record”, “digitization”, “minority”, “documents in the republic of China” had increased during the past two decades and new hot topics of DHPAC research kept appearing in China.

Originality/value

This study synthesized and analyzed the research results of DHPAC research in China from a more comprehensive perspective and revealed the topic structure and longitudinal evolution process intuitively with co-word analysis and social network analysis, which can assist researchers to improve research systematization, discover new research directions and seek cooperative research path.

Details

Library Hi Tech, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0737-8831

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Article
Publication date: 6 June 2016

Fu-li Zhou, Xu Wang, Yun Lin, Yan-dong He and Nan Wu

The purpose of this study is to investigate the research on the influence of tech-innovation behavior on tech-innovation performance for Chinese manufacturing enterprises…

Abstract

Purpose

The purpose of this study is to investigate the research on the influence of tech-innovation behavior on tech-innovation performance for Chinese manufacturing enterprises. Environmental performance has been taken into consideration with the green manufacturing and sustainability philosophy being a hotspot.

Design/methodology/approach

To verify the hypotheses and assumptions, a questionnaire was designed and a semi-structured interview was conducted for data collection. In addition, structural equation modeling (SEM) is applied to verify the influence model through assessing the fitting indexes based on the 317 questionnaire responses in the form of Likert-type scale.

Findings

Tech-innovation behavior and activity from direction, mode and investment behavior dimensions show their different positive influences on tech-innovation performance. This paper has creatively taken environmental tech-innovation performance into consideration, as well as economic performance. This investigation has provided the interpretation for each individual enterprise from three dimensions when conducting tech-innovation activity.

Research limitations/implications

Tech-innovation behavior, which has been a subject of extended discussion during recent decades, is the effective activity or action for tech-innovation. However, there have not been any studies on the environmental performance influence study, as well as the economic performance from these three dimensions and framework.

Practical implications

As this paper discusses the tech-innovation performance influence study from three dimensions, individual enterprises can choose the corresponding action for the proper tech-innovation path, especially for small- and medium-sized enterprises.

Originality/value

This study helps managers recognize tech-innovation activities for better tech-innovation performance based on the empirical study.

Details

International Journal of Innovation Science, vol. 8 no. 2
Type: Research Article
ISSN: 1757-2223

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Article
Publication date: 2 February 2021

Alex Cockain

This article documents accounts of the tactics parents and siblings of autistic persons in Hong Kong deploy to manage social encounters. This article aims to consider the…

Abstract

Purpose

This article documents accounts of the tactics parents and siblings of autistic persons in Hong Kong deploy to manage social encounters. This article aims to consider the impact of such tactics and their enmeshment with factors that combine to limit satisfactory outcomes and outlines a project intent upon contriving dialogue between persons.

Design/methodology/approach

This qualitative project elicited stories and accounts (or narratives) produced by persons involved in encounters involving autistic persons. This project also intervened in these encounters.

Findings

Persons involved in social encounters are de-fused, in the sense of being disconnected. The emotions persons experience through these encounters (e.g. and especially anxiety) remain hidden. Dialogue has the capacity to re-fuse, not only reconnecting but also rejecting unsatisfactory arrangements.

Originality/value

The dialogue produced in the article may extend beyond the specific circumstances and persons considered, potentially reducing the barriers and distances between autistic persons and others.

Details

Tizard Learning Disability Review, vol. 26 no. 1
Type: Research Article
ISSN: 1359-5474

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Article
Publication date: 31 August 2012

Ling‐Yun He and Wen‐Si Xie

There is a distinct separation of price discovery from pricing power in China's sugar spot and futures markets. The purpose of this paper is to identify the reasons and…

Abstract

Purpose

There is a distinct separation of price discovery from pricing power in China's sugar spot and futures markets. The purpose of this paper is to identify the reasons and provide plausible explanations for this stylized phenomenon. Therefore, the research may deepen the understandings of the operational mechanisms and internal efficiency of China's sugar spot and futures markets.

Design/methodology/approach

The authors analyze the historical spot and futures price time series from China's sugar spot market and China's Zhengzhou Commodity Exchange (CZCE) within a co‐integration framework.

Findings

It is found that China's sugar spot market has the pricing power, even though the futures market leads the spot market in price discovery. The phenomenon of observed separation of price discovery in spot market from pricing power in futures market may be caused by: irrational speculation in CZCE sugar futures market; oligopoly and local government politics; or the operational efficiency of the wholesale spot market, especially for its comparative advantages of information accessibility in the sugar producing areas. The results are compared with other empirical findings in many other commodities markets to obtain deeper understandings.

Originality/value

The paper uncovers and provides the earliest econometric evidence of the observed stylized phenomenon and also provides plausible explanations for this phenomenon.

Details

China Agricultural Economic Review, vol. 4 no. 3
Type: Research Article
ISSN: 1756-137X

Keywords

Content available
Article
Publication date: 28 August 2009

Abstract

Details

China Agricultural Economic Review, vol. 1 no. 4
Type: Research Article
ISSN: 1756-137X

Abstract

Details

China Agricultural Economic Review, vol. 10 no. 1
Type: Research Article
ISSN: 1756-137X

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Article
Publication date: 2 July 2018

Usamah F. Alfarhan and Samir Al-Busaidi

The purpose of this paper is to explain prevalent earnings differentials in Gulf Cooperation Council’s (GCC’s) private sectors between skilled local and migrant labor and…

Abstract

Purpose

The purpose of this paper is to explain prevalent earnings differentials in Gulf Cooperation Council’s (GCC’s) private sectors between skilled local and migrant labor and provide estimates of potential price distortions to underlie future market-based corrective policies that increase participation of locals in private employment.

Design/methodology/approach

The paper uses an individual-level data set on workers’ earnings and productivity-related characteristics to decompose estimated earnings differentials at the mean level and at various percentiles of the earnings distribution via well-established decomposition approaches.

Findings

Results show that the real earnings differential between locals and Asians decreases at higher earnings, while that between locals and non-GCC Arabs are relatively stable. Both are characterized by overpayment of locals, that is, self-inflicted by current nationalization policies. Higher earnings of Westerners are due to their superior productivity-related characteristics.

Research limitations/implications

Due to the lack of official individual-level data on workers’ productivity-related characteristics, this paper is compelled to utilize an open-source primary data set. Despite the data set’s ability to reproduce officially published aggregates and produce sound econometric results, findings are not entirely proof against sampling bias.

Practical implications

The paper demonstrates that the failure of GCC’s nationalization policies is self-inflicted by the current quota system and by the lack of legislative frameworks that ensure equal pay for equal work. Effective nationalization ought to be market based, rather than by fiat.

Originality/value

The paper is the first to analyze GCC’s private earnings differentials at the individual level and provides micro-econometric evidence on existing price distortions.

Details

International Journal of Manpower, vol. 39 no. 4
Type: Research Article
ISSN: 0143-7720

Keywords

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