The aim of this paper is to research grease and additives' influence on fretting wear of mild steel.
Abstract
Purpose
The aim of this paper is to research grease and additives' influence on fretting wear of mild steel.
Design/methodology/approach
Experiments were performed on a laboratory stand with contact conditions cylinder on flat. The mild steel couples were tested under dry conditions and lubricated with mineral and synthetic greases containing as additives: graphite, molybdenum disulphide, ZDDP and molybdenum dithiocarbamate in different concentrations.
Findings
The results revealed a significant influence of grease consistency and its welding load on the fretting wear of steel couples. Graphite and molybdenum disulphide were effective in a 10 percent concentration. ZDDP additive in a more than 1 percent concentration increased fretting wear. Molybdenum dithiocarbamate was not more effective than molybdenum disulphide powder. Grease lubrication of the fretted couple changed significantly the wear mechanism observed on SEM photographs of fretting scars.
Practical implications
The paper presents some indications of proper selection of grease for fretting prevention.
Originality/value
The influence of the main features of grease on fretting wear was confirmed on the basis of extensive investigation.
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The purpose of this paper is to investigate the properties of the classical goodness of fit test statistics X2, G2, GM2, and NM2 in testing quality of process represented as the…
Abstract
Purpose
The purpose of this paper is to investigate the properties of the classical goodness of fit test statistics X2, G2, GM2, and NM2 in testing quality of process represented as the trinomial distribution with dip null hypothesis and to devise a control chart for the trinomial distribution with dip null hypothesis based on demerit control chart.
Design/methodology/approach
The research involves the linear form of the test statistics, the linear function of counts since the marginal distribution of the counts in any category is binomial or approximated Poisson, in which the uniformly minimum variance unbiased estimator is the linear function of counts. A control chart is used for monitoring student characteristics in Thailand. The control chart statistics based on an average of the demerit value computed for each student as a weighted average lead to a uniformly most powerful unbiased test marginally. The two‐sided control limits were obtained using percentile estimates of the empirical distribution of the averages of the demerit.
Findings
The demerit control chart of the weight set (1, 25, 50) shows a generally good performance, robust to direction of out‐of‐control, mostly outperforms the GM2 and is recommended. The X2, NM2 are not recommended in view of inconsistency and bias. The performance of the demerit control chart of the weight set (1, 25, 50) does not dramatically change between both directions.
Practical implications
None of the multivariate control charts for counts presented in the literature deals with trinomial distribution representing the practical index of the quality of the production/process in which the classification of production outputs into three categories of “good”, “defective”, and “reworked” is common. The demerit‐based control chart presented here can be applied directly to this situation.
Originality/value
The research considers how to deal with the trinomial distribution with dip null hypothesis which no research study so far has presented. The study shows that the classical Pearson's X2, Loglikelihood, modified Loglikelihood, and Neyman modified X2 could fail to detect an “out‐of‐control”. This research provides an alternative control chart methodology based on demerit value with recommended weight set (1, 25, 50) for use in general.
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Jia Jia Lim, Jing Dai and Antony Paulraj
This paper aims to adopt the strategy-structure-performance (SSP) framework to explore how proactive social strategy could motivate firms to collaborate with suppliers on social…
Abstract
Purpose
This paper aims to adopt the strategy-structure-performance (SSP) framework to explore how proactive social strategy could motivate firms to collaborate with suppliers on social sustainability initiatives, and how such collaborative efforts could unlock a win-win opportunity for both noneconomic (social performance) and economic (operational performance) performance. Additionally, drawing on the tenets of the social exchange theory, the different moderating effects of distributive justice and procedural justice on the social collaboration-performance relationship are also examined.
Design/methodology/approach
This study uses survey data collected from 215 manufacturing companies in China. The proposed hypotheses are tested using multiple linear regression models as well as the PROCESS macro within SPSS.
Findings
The results suggest that (1) a proactive social strategy could motivate firms to collaborate with suppliers on joint social activities and (2) social collaboration with suppliers can have a significant positive effect on both social and operational performance. The moderation results suggest that distributive justice has a differential effect on the collaboration-performance link. Particularly, distributive justice strengthens the relationship between social collaboration and operational performance, while it weakens the relationship between social collaboration and social performance. Surprisingly, procedural justice did not have a significant moderating effect on the social collaboration-performance link.
Originality/value
This paper extends the SSP framework to the social sustainability context by not only stressing the importance of proactivity in managing sustainability, but also revealing collaboration as a structural aspect that could achieve superior performance benefits. This study also contributes to sustainable supply chain literature by exploring the moderating roles of justice elements.
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Murtaza Faruquee, Antony Paulraj and Chandra Ade Irawan
The purpose of this study is to investigate the role that communication, trust and digital transformation can play in the relationship between joint problem-solving and supply…
Abstract
Purpose
The purpose of this study is to investigate the role that communication, trust and digital transformation can play in the relationship between joint problem-solving and supply chain resilience. More specifically, the authors try to examine the possibility of digital transformation as a replacement for trust within a joint problem-solving context.
Design/methodology/approach
A survey instrument was developed and administrated to manufacturing firms within the United Kingdom and the United States. Based on data collected from 291 senior managers, multiple linear regressions were conducted through a customized process model to test the proposed hypotheses.
Findings
The results point to the actual impact of digital transformation being far more complicated than the initial benefits that it appears to bring within a supply chain. Thus, technology is only effective when applied within the right context. The authors showcase that the trio of digital transformation, trust and joint problem-solving can be highly valuable to establish supply chain resilience and that further investigation on the interrelationships between these concepts is warranted.
Practical implications
Manufacturing firms that aim to adopt new technologies should not consider advanced digital technologies as an alternative to trust. While digital transformation can improve resource sharing and integration, governance mechanisms–such as trust–will remain the cornerstones of strategic supplier relationships. Therefore, supply chain partners must strive to achieve a balance between trust and the right type of digital technology.
Originality/value
This study contributes to the growing literature focusing on the role that digital transformation can play in developing supply chain capabilities. It adds an early empirical insight on the role of technology and governance in joint problem-solving and supply chain resilience.
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Margarita Georgousopoulou, Max Chipulu, Udechukwu Ojiako and Johnnie Johnson
Current research in the area of risk management within small and medium-sized enterprises (SMEs) appears predisposed towards risk, predominantly dealing with the willingness of…
Abstract
Purpose
Current research in the area of risk management within small and medium-sized enterprises (SMEs) appears predisposed towards risk, predominantly dealing with the willingness of SMEs to take on losses. However, in this pilot study, the authors aim to focus on a different aspect of risk management in SMEs, namely the risk preferences. Risk preferences in this case are regarded as the willingness of SME proprietors to take on risks that are likely to lead to investment gains.
Design/methodology/approach
Data is gathered via a combination of a survey questionnaire and a probability scenario toolset. The authors sampled a total of 150 SME proprietors operating in Greece. The data was analysed using a combination of regression models and binomial tests.
Findings
The results suggest that we cannot, as previous literature suggests, conclude that SME proprietors generally exhibit a negative risk preference.
Originality/value
In light of Greece's recent economic difficulty, and in acknowledgement of the critical role played by SMEs in the Greek economy, this study addresses a topical subject in entrepreneurship research: what are the factors determining investment risk preferences?
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Xianchun Zhang, Zhu Yao, Wan Qunchao and Fu-Sheng Tsai
Time pressure is the most common kind of work pressure that employees face in the workplace; the existing research results on the effect of time pressure are highly controversial…
Abstract
Purpose
Time pressure is the most common kind of work pressure that employees face in the workplace; the existing research results on the effect of time pressure are highly controversial (positive, negative, inverted U-shaped). Especially in the era of knowledge economy, there remains a research gap in the impact of time pressure on individual knowledge hiding. The purpose of this paper is to explore the impact of different time pressure (challenge and hindrance) on knowledge hiding and to explain why there is controversy about the effect of time pressure in the academics.
Design/methodology/approach
The authors collected two waves of data and surveyed 341 R&D employees in China. Moreover, they used regression analysis, bootstrapping and Johnson–Neyman statistical technique to verify research hypotheses.
Findings
The results show that challenge time pressure (CTP) has a significant negative effect on knowledge hiding, whereas hindrance time pressure (HTP) has a significant positive effect on knowledge hiding; job security mediates the relationship between time pressure and knowledge hiding; temporal leadership strengthen the positive impact of CTP on job security; temporal leadership can mitigate the negative impact of HTP on job security.
Originality/value
The findings not only respond to the academic debate about the effect of time pressure and point out the reasons for the controversy but also enhance the scholars’ attention and understanding of the internal mechanism between time pressure and knowledge hiding.
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Antony Paulraj, Christopher Rajkumar, Constantin Blome and Murtaza Faruquee
That knowledge acquisition from external sources can play a pivotal role in product design is a well-known fact. However, knowledge acquisition need not play a pivotal role in…
Abstract
Purpose
That knowledge acquisition from external sources can play a pivotal role in product design is a well-known fact. However, knowledge acquisition need not play a pivotal role in every context; it is also documented to have a dark side (i.e. negative impacts). Specifically, given that product stewardship, by definition, calls on each party in the product life cycle – including suppliers – to share responsibility for the environmental impact of products, the purpose of this study is to answer the question “whether knowledge acquired from suppliers plays a beneficial role in the context of product stewardship?”
Design/methodology/approach
This study focuses on the effect of knowledge acquisition on product stewardship and its subsequent effect on environmental performance. Given that the effect of knowledge acquisition could be moderated by firm-specific and relational factors, this study also considers the moderating role of knowledge exploitation and supplier opportunism. Using primary data, the hypotheses are tested using two-stage hierarchical ordinary least squares regression models involving valid instruments.
Findings
Though extant research doubts that knowledge acquisition will always be beneficial, this study adheres to the tenets of knowledge-based view and hypothesize that knowledge acquisition is pivotal to product stewardship and its subsequent impact on environmental performance. But the results suggest an intriguing double-edged effect of knowledge acquisition; while its direct effect on product stewardship is nonsignificant, it seemed to have a significant positive moderating effect on the relationship between product stewardship and environmental performance. But whenever knowledge exploitation and supplier opportunism are maintained at ideal levels, this double-edged effect of knowledge acquisition is successfully negated.
Originality/value
While knowledge acquisition is key for new product design, its specific role in the product design that incorporates environmental considerations is still not clear. By proposing that knowledge acquisition could instead have a double-edged effect within the unique context of product stewardship, the study makes an invaluable contribution to the extant literature on knowledge management within supply chain relationships.
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Francis Kamewor Tetteh, Dennis Kwatia Amoako, Andrews Kyeremeh, Gabriel Atiki, Francisca Delali Degbe and Prince Elton Dion Nyame
The coronavirus disease 2019 (COVID-19) pandemic represents one of the most significant disruptions to supply chains (SCs), stimulating both practitioners and scholars to seek…
Abstract
Purpose
The coronavirus disease 2019 (COVID-19) pandemic represents one of the most significant disruptions to supply chains (SCs), stimulating both practitioners and scholars to seek ways to enhance supply chain performance (SCP). Recent advancements in technology, particularly supply chain analytics (SCA) technologies, offer promising avenues for mitigating risks associated with SC disruptions like those posed by the COVID-19 pandemic. However, the existing literature lacks a comprehensive analysis of the connection between SCA and healthcare SC (HSC) performance. To address this research gap, we employed the dynamic capability perspective to investigate the mediating roles of supply chain innovation (SCI), resilience (SCR) and flexibility (SCF) in the relationship between SCA and HSC performance. The study further examined the moderating role of a data-driven culture (DDC).
Design/methodology/approach
The proposed model was tested using survey data from 374 managers of healthcare facilities in Ghana. SPSS and Amos were used to analyze the data gathered.
Findings
The results showed that while SCA may drive HSC performance, the presence of SCI, SCR and SCF may serve as channels to drive enhanced HSC performance. Additionally, we also found that different levels of a DDC induce varying effects of SCA on SCI, SCR and SCF.
Research limitations/implications
The study’s results have theoretical and practical implications, offering valuable insights for the advancement of SCA in healthcare literature. They also deepen SC managers’ comprehension of how and when SCA can boost HSC performance. However, as the study was limited to healthcare facilities in Ghana, its findings may not be universally applicable.
Originality/value
This study contributes to the literature by demonstrating that SCI, SCR, SCF and a DDC could serve as transformative mechanisms to reap superior HSC outcomes. This study also offers contemporary guidance to managers regarding SCA investment decisions.
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Faqir Sajjad Ul Hassan, Wajahat Karim, Hassan Ahmed Shah and Naqeeb Ullah Khan
Under the tenets of conservation of resources and role theories, this study has aimed to draw up and test a moderated-mediation model. The model postulates job burnout (JB) as a…
Abstract
Purpose
Under the tenets of conservation of resources and role theories, this study has aimed to draw up and test a moderated-mediation model. The model postulates job burnout (JB) as a mediator between role stress (RS) and organizational commitment (OC) while transformational leadership (TFL) as a moderator to such mediation.
Design/methodology/approach
For this cross-sectional study, multisource field data from the service industry was collected using a convenient sampling procedure. A total of 354 employees participated in the anonymous survey. The proposed model of the study was tested with a hierarchical regression approach using Hayes PROCESS macro.
Findings
The data fitted best for the four-factor measurement model of the study. Afterward, the authors found that RS directly affected employees’ perception of OC. The relationship between RS and OC was partially mediated by JB. The authors ascertained the transformational leader’s buffering role between the RS-JB relationship and the transformational leader’s contingent indirect effect as well.
Originality/value
This research is a first-of-its-kind investigation into enlightening the direct and indirect link via JB between RS and OC and the moderating effect of TFL on such indirect effect in a rarely studied organizational setting of a developing country.
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Henrik Franke, Finn Wynstra, Fabian Nullmeier and Chloe Nullmeier
Managing projects is an important part of operations management, but many projects fail. This study focuses on attribution processes of such disruption from the underrepresented…
Abstract
Purpose
Managing projects is an important part of operations management, but many projects fail. This study focuses on attribution processes of such disruption from the underrepresented perspective of the project manager. The authors consider two types of causes: the more frequently researched environmental uncertainty (i.e. uncontrollable events) and the scarcely researched uncertainty imposed by non-collaborative project sponsors (i.e. other-controllable events).
Design/methodology/approach
The authors test conceptual arguments grounded in attribution theory and the notion of psychological contracts in a scenario-based experiment among 325 practicing project managers.
Findings
The findings indicate that non-collaborative project sponsors negatively affect project managers' motivation, whereas uncontrollable disruptions leave hope to achieve positive future outcomes. This latter effect is further strengthened when project managers have an internal attribution style. They tend to blame the disruption on themselves and generally feel in control of achieving success even if they are not.
Originality/value
These socio-psychological insights nuance the economic idea that uncertainty reduces motivation per se in the context of project disruption appraisal. The authors contribute to the behavioral project management literature and general attribution theory and help guide the allocation of resources during the recovery of failed projects.