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Article
Publication date: 1 December 2023

Yunhao Zhang, Chunlei Shao, Jing Kong, Junwei Zhou and Jianfeng Zhou

This paper aims to prevent gasket sealing failure in engineering, accurately predict gasket life, extend system life and improve sealing reliability. The accelerated life test…

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Abstract

Purpose

This paper aims to prevent gasket sealing failure in engineering, accurately predict gasket life, extend system life and improve sealing reliability. The accelerated life test method of flexible graphite composite–reinforced gaskets is established, the life distribution law of flexible graphite composite–reinforced gaskets is revealed, and the life prediction method of flexible graphite composite–reinforced gaskets with different allowable leakage rates is proposed, which can provide a reference for the life prediction of other types of gaskets.

Design/methodology/approach

In this study, flexible graphite composite–reinforced gaskets were tested for long-term high-temperature sealing performance on a multi-sample gasket accelerated life test rig. The data were also analyzed using the least squares method and the K-S hypothesis calibration method. A gasket time-dependent leakage model and an accelerated life model were also developed. Constant stress-accelerated life tests were conducted on flexible graphite composite–reinforced gaskets. On this basis, a gasket life prediction method at different allowable leakage rates was proposed.

Findings

The life distribution law of flexible graphite composite–reinforced gaskets is revealed. The results show that the life of the gasket obeys the Weibull distribution. The time-correlated leakage model and accelerated life model of the gasket were established. And the accelerated life test method of the flexible graphite composite–reinforced gasket was established. The life distribution parameters, accelerated life model parameters and life estimates of gaskets were obtained through tests. On this basis, a gasket life prediction method under different leakage rates was proposed, which can be used as a reference for other types of gaskets.

Practical implications

The research in this paper can better provide guidance for the use and replacement of gaskets in the project, which is also very meaningful for predicting the leakage condition of gaskets in the bolted flange connection system and taking corresponding control measures to reduce energy waste and pollution and ensure the safe operation of industrial equipment.

Originality/value

A multi-specimen gasket-accelerated life test device has been developed, and the design parameters of the device have reached the international advanced level. The life distribution law of the flexible graphite composite–reinforced gasket was revealed. The accelerated life test method for the flexible graphite composite–reinforced gasket was established. The life prediction method of the flexible graphite composite–reinforced gasket under different allowable leakage rates was proposed.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2023-0254/

Details

Industrial Lubrication and Tribology, vol. 76 no. 1
Type: Research Article
ISSN: 0036-8792

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Breaking the Zero-Sum Game
Type: Book
ISBN: 978-1-78743-186-7

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Article
Publication date: 15 February 2013

Yat Hung Chiang, Jing Li, Tracy N.Y. Choi and King Fai Man

The purpose of this paper is to investigate whether a few leading Hong Kong construction firms are also efficient contractors. Theoretically, market leaders can exploit the virtue…

759

Abstract

Purpose

The purpose of this paper is to investigate whether a few leading Hong Kong construction firms are also efficient contractors. Theoretically, market leaders can exploit the virtue of economy of scale, learning curve and cost leadership to consolidate their competitiveness. However, if market share is key success factor for firms to become and stay competitive, smaller contractors will be further marginalized if the construction market continues to shrink as Hong Kong's economy approaches maturity. Hence the research question is: Have a few leading contractors been taking advantage of their market size to be efficient in Hong Kong?

Design/methodology/approach

Based on the Data Envelopment Analysis Assurance Region (DEA_AR) model, the efficiency scores of 17 major Hong Kong contractors are compiled over the last ten years. DEA is a non‐parametric approach to examine the relative efficiency among different firms, in terms of output/input ratios. Unlike traditional I‐O analysis which relies on a static table of coefficients, DEA does not require any priori and usually subjective weights for inputs or outputs.

Findings

The results identify efficient contractors, among which the three leading ones (China State Construction, Shui On Construction and Yau Lee Holdings) have captured the majority of housing construction contract values. Nevertheless, only China State Construction has ranked consistently as most efficient over time. The efficiency scores of Shui On Construction have decreased successively from 2002 to 2009, and it has been the least efficient contractor from 2006 to 2009. Yau Lee Holdings has a V‐curve of efficiency scores.

Originality/value

This study represents the first attempt to adopt a DEA_AR model to evaluate construction contractors' efficiency, which reduces the number of zeroes and the variation in weights for estimation and enhances the adequacy for individual contractor's efficiency scores, compared to other types of DEA models such as the CCR model and the BCC model.

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Journal of Facilities Management, vol. 11 no. 1
Type: Research Article
ISSN: 1472-5967

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Article
Publication date: 6 July 2012

Yat Hung Chiang, Jing Li, Tracy N.Y. Choi and King Fai Man

The purpose of this study is to present and compare the productive efficiency of China Mainland and China Hong Kong contractors, and to identify and investigate the components and…

1052

Abstract

Purpose

The purpose of this study is to present and compare the productive efficiency of China Mainland and China Hong Kong contractors, and to identify and investigate the components and sources of their efficiency under different economic and institutional environments.

Design/methodology/approach

Data envelopment analysis (DEA) is a non‐parametric approach to examine the relative efficiency among different firms. This study employs DEA based Malmquist Productivity Index (MPI) to compile the efficiency scores of 20 construction companies listed in the Hong Kong Exchange and Clearing Limited (HKEx) from 2004 to 2010.

Findings

A decomposition of MPI suggests that catch‐up effect has contributed more to contractor's efficiency than frontier‐shift effect. Compared to their Mainland counterparts, Hong Kong contractors have higher MPI mainly due to higher efficiency scores in catch‐up effect.

Practical implications

Hong Kong contractors have advantage over Mainland contractors in their managerial and strategic capabilities. Hence Hong Kong contractors should lever on their managerial expertise in accounting, financing and legal services when exporting their services. Meanwhile, Mainland contractors should improve their efficiency by making the most use of their technological and human resources, thus improving upon their international entrepreneurship.

Originality/value

This study is the first attempt to apply MPI to compare the productive efficiency of listed contractors in China Mainland and China Hong Kong. The findings contribute to the body of knowledge for productive efficiency measurement.

Details

Journal of Facilities Management, vol. 10 no. 3
Type: Research Article
ISSN: 1472-5967

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Article
Publication date: 9 February 2010

Simon Chak‐keung Wong and Gloria Jing Liu

This study aims to examine how the perceptions of hospitality and tourism management (HTM) undergraduates about their parental influences predict their career choice intention…

8718

Abstract

Purpose

This study aims to examine how the perceptions of hospitality and tourism management (HTM) undergraduates about their parental influences predict their career choice intention with regard to the hospitality and tourism (H&T) industry in China.

Design/methodology/approach

A self‐administered questionnaire containing 22 parental influence attributes was given to both junior and senior students studying HTM programmes. Primary research on students' perceptions of parental influences on career choice has been undertaken in ten universities across five cities in China, with 566 valid samples acquired as a result.

Findings

Three out of six parental influential factors derived from 22 attributes are determined as being the salient predictors for students' H&T career choice intention. Those three factors are “perceived parental supports of the H&T industry”, “perceived parental career concerns about welfare and prestige”, and “perceived parental barriers to career choice”. Demographic differences in parental influential factors are also revealed in the study.

Research limitations/implications

The findings need to be confirmed by further evidence from other countries with different cultures. Future research should investigate students studying different majors, or at various educational levels. The variables of internship experience and colleges or universities being attended also deserve more attention. Another interesting topic would be to study parental influences on career choice from the parents' perspectives.

Originality/value

The knowledge obtained from the study will increase the very limited understanding of the effects of perceived parental influences on career choice, which might then lead to more attraction and recruitment of students to the H&T industry in China.

Details

International Journal of Contemporary Hospitality Management, vol. 22 no. 1
Type: Research Article
ISSN: 0959-6119

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Article
Publication date: 12 October 2012

Chaoqun Ma, Lan Liu, Junbo Wang and Jing Chen

The purpose of this paper is to examine the risk of inefficiency of China's stock index futures market by investigating the opportunity and profitability of exchange‐traded fund…

850

Abstract

Purpose

The purpose of this paper is to examine the risk of inefficiency of China's stock index futures market by investigating the opportunity and profitability of exchange‐traded fund (ETF) arbitrage. The explanation of behavioral risk to market efficiency is examined.

Design/methodology/approach

Based on cost‐of‐carry model, some assumptions about market efficiency were examined, and statistical tests were implemented to support the findings.

Findings

In China, borrowing and lending interest rates are quite different; dividends are small and paid in an irregular manner; and short sale cannot be used in arbitrage by all investors. It is found that the Chinese index futures market is far from efficient.

Originality/value

With reference to the empirical study, this is believed to be the first application of behavioral study to the study of market efficiency. The analysis of the statistics about Chinese index futures market and the algorithm parameters are very valuable for in‐depth understanding of the emerging markets.

Details

Kybernetes, vol. 41 no. 10
Type: Research Article
ISSN: 0368-492X

Keywords

Available. Content available
Book part
Publication date: 18 August 2017

Abstract

Details

Breaking the Zero-Sum Game
Type: Book
ISBN: 978-1-78743-186-7

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Article
Publication date: 1 January 1992

DW Taylor and KC Liu

Financial performance measures of State‐owned enterprise in China have assumed a more diverse role as a result of reform programmes which have introduced greater degrees of…

271

Abstract

Financial performance measures of State‐owned enterprise in China have assumed a more diverse role as a result of reform programmes which have introduced greater degrees of operating management autonomy, market responsibility and profit sharing incentives at the enterprise level. This paper reviews the changing role of accounting performance criteria in meeting the needs of operating managers of State enterprise who have an increased decision‐making autonomy, while also maintaining the needs of government bureaus for financial performance criteria related to economic planning and control at the regional and national levels. Using a case study of a State‐owned department store in Guangzhou, an assessment is made of the conceptual and practical difficulties facing China's policy‐makers in setting accounting ratio performance indicators for State commercial enterprises. An alternative set of primary financial performance indicators for such enterprises is constructed by considering approaches adopted in other socialist countries.

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Asian Review of Accounting, vol. 1 no. 1
Type: Research Article
ISSN: 1321-7348

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Article
Publication date: 17 September 2021

Wang Zhizhong, Han Chao, Guosheng Huang, Han Bin and Han Bin

The deposition of particles onto a substrate during the cold spraying (CS) process relies on severe plastic deformation, so there are various micro-defects induced by insufficient…

507

Abstract

Purpose

The deposition of particles onto a substrate during the cold spraying (CS) process relies on severe plastic deformation, so there are various micro-defects induced by insufficient deformation and severe crushing. To solve the problems, many post-treat techniques have been used to improving the quality by eliminating the micro-defects. This paper aims to help scholars and engineers in this field a better and systematic understand of CS technology by summarizing the post-treatment technologies that have been investigated recently years.

Design/methodology/approach

This review summarizes the types of micro-defects and introduces the effect of micro-defects on the properties of CS coating/additive manufactured, illustrates the post-treatment technologies and its effect on the microstructure and performances, and finally outlooks the future development trends of post-treatments for CS.

Findings

There are significant discoveries in post-treatment technology to change the performance of cold spray deposits. There are also many limitations for post-treatment methods, including improved performance and limitations of use. Thus, there is still a strong requirement for further improvement. Hybrid post-treatment may be a more ideal method, as it can eliminate more defects than a single method. The proposed ultrasonic impact treatment could be an alternative method, as it can densify and flatten the CS deposits.

Originality/value

It is the first time to reveal the influence factors on the performances of CS deposits from the perspective of microdefects, and proposed corresponding well targeted post-treatment methods, which is more instructive for improving the performances of CS deposits.

Details

Rapid Prototyping Journal, vol. 28 no. 2
Type: Research Article
ISSN: 1355-2546

Keywords

Available. Open Access. Open Access
Article
Publication date: 7 August 2018

Libo Yan

The purpose of this paper is to apply what can be learned from the emergence of nature tourism to understand some current and future trends of tourism.

2215

Abstract

Purpose

The purpose of this paper is to apply what can be learned from the emergence of nature tourism to understand some current and future trends of tourism.

Design/methodology/approach

This study adopted the evolutionary paradigm for investigation.

Findings

The emergence of nature tourism in early medieval China can be attributed to four major factors, including transformation of value orientations, seeking longevity, interest in suburbs and population migration.

Research limitations/implications

Historical studies help understand the current and future trends. When the contributing factors for nature tourism are linked to the contemporary world, it can be found that these factors are still playing a part in shaping tourism trends or patterns in their original or alternative forms. These trends or patterns are worthy of scholarly investigations.

Originality/value

This paper offers a comprehensive understanding of the origins of nature tourism.

Details

Journal of Tourism Futures, vol. 4 no. 3
Type: Research Article
ISSN: 2055-5911

Keywords

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