Optimal design of micro-dimples on crankpin bearing surface for improving engine’s lubrication and friction

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Renqiang Jiao ◽  
Vanliem Nguyen ◽  
Vanquynh Le ◽  
Vancuong Bui
Keyword(s):  
Optimal Design ◽  
Slip Surface ◽  
Asperity Contact ◽  
Bearing Surface ◽  
Content Type ◽  
Multi Objective Genetic Algorithm ◽  
Lubrication Performance ◽  
Study Results ◽  
Micro Dimples ◽  
The Impact

Purpose The purpose of this paper is to investigate the optimal design of micro-dimples on the bearing surface of the crankpin bearing (CB) to ameliorate the engine’s lubrication and friction (ELF). Design/methodology/approach A hydrodynamic model of the CB considering the influence of the asperity contact is built under the impact of the dynamic loading of the slider-crank-mechanism. The micro-dimples on non-slip surface of the bearing are designed and optimized based on the lubrication model and multi-objective genetic algorithm. The performance of optimal micro-dimples on ameliorating the ELF is analyzed and compared with that of optimal CB dimensions via the reduction of the solid contact force, friction force and friction coefficient between the crankpin and bearing surfaces; and the increase of the oil film pressure. Findings The optimal design of micro-dimples on the bearing surface may not only greatly ameliorate the ELF but also make the rotation of the crankpin inside the bearing more stable in comparison with the optimization of CB dimensions. Originality/value This study results not only clearly ameliorates the ELF but also can be applied to the slip/non-slip surface pairs of other journal bearings to enhance their lubrication performance.

Design and optimization of textures on the surface of crankpin bearing to improve lubrication efficiency and friction power loss of engine

2020 ◽  
pp. 135065012094200
Author(s):  
Zhenpeng Wu ◽  
Vanliem Nguyen ◽  
Vanquynh Le ◽  
Xuanlong Le ◽  
Vancuong Bui
Keyword(s):  
Power Loss ◽  
Asperity Contact ◽  
Bearing Surface ◽  
Film Pressure ◽  
Oil Film ◽  
Design And Optimization ◽  
Friction Power ◽  
Study Results ◽  
The Impact ◽  
Oil Film Pressure

The study proposes a design and optimization of textures on the surface of crankpin bearing to improve the lubrication efficiency and friction power loss (LE-FPL). A hydrodynamic lubrication model of crankpin bearing considering the impact of the external dynamic load and micro asperity contact is established. Based on the established model, the lubrication textures designed on the bearing surface are then simulated and optimized through the algorithms developed in Matlab environment and multi-objective optimization method. Increasing the oil film pressure and reducing the contact force ( Wac) in the asperity contact region, friction force ( Ff), and friction coefficient ( µ) of crankpin bearing are the objective functions to evaluate the LE-FPL. The study results indicate that the lubrication textures designed on the bearing surface have an obvious effect on improving the LE-FPL. Especially, with the optimized textures, the maximum oil film pressure is greatly increased by 44.8% while the maximum values of Wac and Ff are significantly reduced by 22% and 25%. Consequently, the lubrication textures added on the surface of crankpin bearing can greatly improve the LE-FPL.

Are atheist consumers less ethical? Investigating the role of religiosity and atheism on consumer ethics

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Denni Arli ◽  
Tuyet-Mai Nguyen ◽  
Phong Tuan Nham
Keyword(s):  
Consumer Ethics ◽  
Intrinsic Religiosity ◽  
Content Type ◽  
Ethical Behaviors ◽  
Segmentation Analysis ◽  
Study Results ◽  
Unethical Behaviors ◽  
The Usa ◽  
Using Data ◽  
The Impact

Purpose There is a perception that non-religious consumers are less ethical than religious consumers. Studies found prejudices against atheists around the world and assumed that those who committed unethical behavior were more likely to be atheists. Hence, first, the purpose of this study is to investigate the effect of consumers’ intrinsic religiosity, extrinsic religiosity and atheism on consumers’ ethical beliefs. Second, this study attempts to segment consumers and identify differences between these segments. Design/methodology/approach Using data from 235 study participants in the USA and 531 in Vietnam. Subsequently, a two-step cluster approach was used to identify segments within these samples. Findings The study results show consumers’ intrinsic religiosity negatively influences all consumers’ unethical beliefs. Similarly, atheism also negatively influences all consumers’ unethical beliefs. This study also complements other studies exploring consumer ethics in developing countries. In addition, the segmentation analysis produced unique segments. The results from both samples (USA and Vietnam) indicated that non-religious consumers are less likely to accept various unethical behaviors compared to religious consumers. Religious consumers are not necessarily more ethical and atheism consumers are not necessarily less ethical. In the end, are implications for business ethics, religious and non-religious leaders on how to view the impact of beliefs on consumer ethical behaviors. Originality/value This is one of the first few studies investigating the impact of atheism on consumer ethics. The results of this study further extend the knowledge of study in consumer ethics by comparing consumers’ religiosity and atheism.

How does reverse factoring affect operating performance? An event study of Chinese manufacturing firms

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yongyi Shou ◽  
Jinan Shao ◽  
Weijiao Wang
Keyword(s):  
Event Study ◽  
Cost Efficiency ◽  
Operating Performance ◽  
Manufacturing Firms ◽  
Content Type ◽  
Performance Effect ◽  
Study Results ◽  
Operating Margin ◽  
The Impact ◽  
The Relationship

PurposeAs a popular supply chain finance (SCF) strategy, reverse factoring has been widely adopted by buyer firms. However, the extant literature provides scant empirical evidence on the performance effect of reverse factoring. The purpose of this study is to seek to narrow this gap by empirically examining the relationship between reverse factoring and operating performance and the contingency conditions of this relationship.Design/methodology/approachBased on a sample of 167 announcements of reverse factoring implementation made by publicly listed Chinese manufacturing firms between 2014 and 2018, this paper employs a long-term event study approach to analyze the operating performance effect of reverse factoring as well as the moderating effects of production and innovation capabilities.FindingsThe event study results indicate that reverse factoring has a positive effect on buyer firms' operating performance in terms of cost efficiency and operating margin. In addition, both production and innovation capabilities positively moderate the relationship between reverse factoring and operating margin. However, neither of them moderates the relationship between reverse factoring and cost efficiency.Originality/valueThis is the first study that empirically examines the impact of reverse factoring on operating performance based on secondary data. Furthermore, it sheds light on the SCF literature by providing insights into the contingency effects of production and innovation capabilities, which also extends our understanding of the application of extended resource-based view in SCF research.

Generation Z and intention to use the digital library: does personality matter?

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
M.A. Sanjeev ◽  
Shahnaz Khademizadeh ◽  
Thangaraja Arumugam ◽  
D.K. Tripathi
Keyword(s):  
Technology Adoption ◽  
Digital Library ◽  
Five Factor Model ◽  
Equation Modeling ◽  
Content Type ◽  
Independent Variables ◽  
Generation Z ◽  
Study Results ◽  
The Impact ◽  
Adoption Intention

Purpose This study aims to evaluate the role of personality in digital library systems (DLS) adoption intention among Generation Z (Gen-Z) students. The study uses the unified theory of acceptance and use of technology-2 and the five-factor model to investigate personality’s influence on Gen-Z’s DLS adoption intention. Design/methodology/approach The study is a descriptive causal investigation based on primary data collected through a self-administered survey using pre-validated tools. The study uses structural equation modeling to investigate personality dimensions’ direct and moderating effect on the dependent, independent variables and their relation. Findings The study results indicate that personality has no significant influence on Gen-Z’s DLS adoption, suggesting the ubiquity and inevitability of technology in current times. Also, only performance expectancy had a considerable impact on DLS adoption among Gen-Z going to college – a deviation from past studies where multiple independent variables have influenced DLS adoption when examined from different technology adoption model angles. Research limitations/implications The current research is done on Gen-Z, and thus the results are ideographic to the cohort. Practical implications The results of the study can be used to effectively design and communicate technology-enabled information solutions among the Cohort. Social implications The results of the study help better understand the factors affecting the technology adoption intentions of Gen-Z. Such understanding can help in better design and implementation of technology-enabled solutions for the cohort, maximizing such system adoption and its effective and efficient utilization. Originality/value The study explores the impact of personality on DLS adoption intentions, hitherto unexplored. The research also focuses on Gen-Z – a cohort born in a technology-enabled world whose attitude and preferences towards technology might differ. The study’s findings will help understand the influence of personality on DLS adoption among the Gen-Z and can be used to design, promote and evaluate such systems.

Implementing capabilities-based quality management and marketing strategies to improve business performance

2016 ◽  
Vol 33 (8) ◽  
pp. 1124-1137 ◽  
Author(s):  
Satish Mehra ◽  
Joshua T. Coleman
Keyword(s):  
Quality Management ◽  
Marketing Strategy ◽  
Organizational Performance ◽  
Management Practices ◽  
Retail Banking ◽  
Marketing Strategies ◽  
Content Type ◽  
Quality Management Practices ◽  
Study Results ◽  
The Impact

Purpose The purpose of this paper is to study the impact of successfully coordinating infrastructural capabilities, such as technology, and structural capabilities, such as people, on the performance of service businesses. Effective coordination of these two types of capabilities is shown to impact the implementation of quality management practices and the design of marketing strategy, both of which when utilized properly, lead to enhanced organizational performance. Design/methodology/approach The authors surveyed retail banking firms for this study to analyze empirical data on infrastructural and structural capabilities. Results were corroborated on the basis of in-depth interviews with several banking managers to provide real world verification of the findings. Findings Results indicate that both infrastructural and structural capabilities positively impact the design of marketing strategy, while only structural capabilities impact the implementation of quality management practices. Both, successfully implemented quality management ideals and a well-designed marketing strategy, are shown to enhance overall organizational performance. Research limitations/implications Research was conducted on a specific sector of the service industry, the banking sector. Also, the relatively small size of the study sample may have impacted the outcome of research applicability in some large businesses. Continuously emerging financial regulations could not be incorporated in the study. On the positive side, strong managerial feedback provides guidance toward adopting the study results, and lays the foundation for future research. Originality/value As today’s rapidly evolving society pushes people out of service encounters, replacing them with efficient and cost-saving technology, roles of both the people and the technology in an organization must be fully understood. This paper shows that, despite the exponential growth of technological innovation, both people and technology are critical to enhancing organizational performance through sound quality management practices and supportive marketing strategies.

scholarly journals An empirical investigation of workplace factors affecting lean performance

2018 ◽  
Vol 67 (2) ◽  
pp. 278-296 ◽  
Author(s):  
Ilias Vlachos ◽  
Evangelia Siachou
Keyword(s):  
Organizational Culture ◽  
Knowledge Acquisition ◽  
Continuous Improvement ◽  
Negative Impact ◽  
Hierarchical Regression ◽  
Content Type ◽  
Factors Affecting ◽  
Study Results ◽  
Workplace Factors ◽  
The Impact

Purpose The purpose of this paper is to identify workplace factors with an impact on lean performance (LP). This can lead to better LP outcomes, thus facilitating organizations to smoothly move from the conventional to lean management. Design/methodology/approach The direct effects of training, knowledge acquisition and organizational culture are empirically investigated using data from 126 managers employed at a global company, which recently has improved its LP. Study’s hypotheses were analyzed with hierarchical regression models. Findings The findings suggest that not all of the aforementioned workplace factors holistically affect LP. Only organizational culture is associated to the four LP variables (i.e. continuous improvement, waste, ergonomy and product quality). Training and knowledge acquisition offer partially effects on LP with training to contribute mostly to predicting continuous improvements. Knowledge acquisition alone, has significant yet negative impact on both continuous improvement and ergonomy. Even more, when training is combined with knowledge acquisition the results are different. Originality/value As this study highlights the impact of workplace practices on LP, attributes mainly importance to the distinct effects that each of the aforementioned factors has on the four distinct LP variables. Although the study results reflect a particular case, its recommendations could facilitate practitioners to achieve better lean outcomes.

The role of perceived social media agility in customer engagement

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
David Gligor ◽  
Sıddık Bozkurt
Keyword(s):  
Social Media ◽  
Online Survey ◽  
Positive Impact ◽  
Customer Engagement ◽  
Measurement Scale ◽  
Content Type ◽  
Study Results ◽  
Seeking Behavior ◽  
The Impact

Purpose The concept of agility has been applied to several domains to help firms develop the capability to quickly adjust their operations to cope and thrive in environments characterized by frequent changes. Despite the soaring number of social media users and the benefits associated with agility in other domains, the application of agility in a social media context has yet to be explored. Further, little is known about how agility in a social media context impacts desirable customer-related attributes, such as customer engagement and customer-based brand equity (CBBE). This paper aims to address this gap by adapting the construct to social media (i.e. perceived social media agility) and exploring its impact on customer engagement and CBBE. Design/methodology/approach This paper conducted an online survey with 200 adult subjects. This paper used multivariate regression analyzes to empirically test a scale for perceived social media agility and explore its impact on CBBE and customer engagement, along with the moderating role of customer change-seeking behavior. Findings The study results show that perceived social media agility directly and indirectly (through customer engagement) positively influences CBBE. Also, results show that the positive impact of perceived social media agility on CBBE is further magnified for customers high on change-seeking. However, customer change-seeking does not affect the strength or direction of the impact of perceived social media agility on customer engagement. Originality/value This paper contributes to social media literature by adapting and testing a measurement scale for the construct of perceived social media agility and exploring its role in enhancing customer engagement and CBBE.

Interactive radio, social network sites and development in Africa: a literature review study

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Marcos Komodromos
Keyword(s):  
Social Network ◽  
Literature Review ◽  
Mass Communication ◽  
Social Network Sites ◽  
Sub Saharan Africa ◽  
Agriculture Education ◽  
African Countries ◽  
Content Type ◽  
Study Results ◽  
The Impact

Purpose The technology determinism theory facilitated in assessing the impact of interactive radio and social network sites (SNSs) on development factors such as education, agriculture, health, and governance, by conducting an integrative and comprehensive literature review focusing on African countries. This paper aims to conduct this literature review to provide comprehensive empirical evidence on the impact of interactive radio and SNSs on development in Africa. Design/methodology/approach This study examined articles that were retrieved from online databases including EBSCOhost, Elsevier, Science Direct, SAGE Journals, Springer and Wiley Online Library. The keywords used included interactive radio, radio, development in Africa, SNS, agriculture, education, health, peace and governance. Search phrases were formulated using boolean operators “AND” and “OR.” Findings Study results revealed that interactive radio and SNSs improve knowledge among farmers and allow the dissemination of information on innovative agricultural techniques, which supports the adoption of sustainable practices. Interactive radio promotes political accountability because the strategies provide the voiceless and powerless communities with a platform to express themselves. This paper discovers that the incorporation of SNS with existing multimedia communication facilitates the dissemination of health-related information on illnesses such as Ebola, HIV, hypertension, diabetes and Polio, and interactive radio and SNS promote education among marginalized communities and under-served rural schools. Research limitations/implications The findings on the impact of interactive radio and SNSs do not represent all 54 countries in Africa. Although the studies included in this literature review were conducted in several countries such as South Africa, Nigeria, Somalia, Kenya, Malawi, Ghana, Tanzania, Uganda and Zambia, this limited the generalizability of the findings and recommendations. Also, the other potential limitation is that using the inclusion-exclusion criteria could have resulted in bias when selecting the studies to include in the review. Practical implications The paper might serve as a valuable source of information for students, academics and entrepreneurs where the impact of interactive radio and SNSs on agriculture, education, health and governance, which are core determinants of development in Africa, has been assessed for further case studies in this area. Social implications The use of interactive radio has helped in decreasing health issues caused by a deficiency in vitamin A among children in sub-Saharan Africa. Originality/value The development of sustainable and effective interactive radio programs is dependent on the collaboration of the core stakeholders such as governmental ministries, donor organizations and the mass communication sector. Numerous open sources on technology radio stations are available to employ social media managers to help in the application of knowledge.

The mediating effects of program loyalty in loyalty rewards programs: an experimental design in coffee shops

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Pınar Başgöze ◽  
Yaprak Atay ◽  
Selin Metin Camgöz ◽  
Lydia Hanks
Keyword(s):  
Experimental Design ◽  
Customer Loyalty ◽  
Perceived Value ◽  
Deep Understanding ◽  
Loyalty Program ◽  
Content Type ◽  
Value Perception ◽  
Study Results ◽  
The Impact ◽  
The Relationship

PurposeThe purpose of this study is to evaluate the impact of reward structure on the customer's value perception of the program, loyalty to the program and loyalty to the firm.Design/methodology/approachA 2 (type of reward) x 2 (timing of redemption) between subjects experimental design was conducted. In addition, the indirect effect of the customer's value perception of the program on loyalty to the firm via loyalty to the program is tested with Hayes and Preacher's mediation procedure.FindingsStudy results indicated that type of reward has a positive impact on the perceived value of a loyalty program. Program loyalty mediates the relationship between the perceived value of the loyalty program and customer loyalty, as well as the relationship between type of reward and customer loyalty.Originality/valueThe findings of this study demonstrate the importance of the type and timing of loyalty program rewards on customer perceptions of the value of the loyalty program. In addition, this study is a step forward in providing a deep understanding of the impact of such perceptions on loyalty. These findings fill a number of research gaps and provide tangible guidance for practitioners.

Celebrity endorsements and branding strategies: event study from India

2015 ◽  
Vol 24 (6) ◽  
pp. 633-645 ◽  
Author(s):  
Saravana Jaikumar ◽  
Arvind Sahay
Keyword(s):  
Event Study ◽  
Economic Value ◽  
Abnormal Returns ◽  
Celebrity Endorsements ◽  
Stock Market Returns ◽  
Content Type ◽  
Study Results ◽  
Branding Strategies ◽  
The Impact ◽  
Corporate Brands

Purpose – The purpose of this study is to evaluate the economic value of celebrity endorsements to Indian firms based on their branding strategy – corporate or house-of-brands – and their “congruence” or “fit” with the celebrity. The overall economic value of endorsements to firms in India, a moderately collectivist culture, is also assessed. Design/methodology/approach – Standard “event study” methodology is used to evaluate the economic value of endorsements under different branding strategies (47 endorsement announcements – 25 corporate brands and 22 house-of-brands). The impact of the level of congruence (assessed using brand personality scales) on abnormal returns is also examined. Findings – Event study results indicate significant positive abnormal returns for corporate brands and insignificant returns to house-of-brands. Moreover, the level of congruence is found to have an insignificant effect on endorsement announcement returns. Overall, celebrity endorsements result in positive economic value to Indian firms. Originality/value – This study evaluates the differences in the effectiveness of celebrity endorsements (which might form a significant part of advertising costs) to firms following different branding strategies. Findings from this study indicate that celebrity endorsement announcements from house-of-brands do not lead to any significant stock market returns (in terms of market value). Further, contrary to current literature, the results indicate that the congruence between brand and celebrity has no impact on returns to endorsements in India, warranting further examination of whether congruence or likeability is important in endorsements.

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