Aida Guerra, Dan Jiang and Xiangyun Du
Student engagement has become increasingly significant in sustainability education for engineers because it enables future engineers to develop competencies, knowledge and values…
Abstract
Purpose
Student engagement has become increasingly significant in sustainability education for engineers because it enables future engineers to develop competencies, knowledge and values relevant to acting for sustainability. Therefore, this paper aims to examine characteristics of student engineer engagement with sustainability and to discuss the meanings of this concept.
Design/methodology/approach
To build a more holistic picture of student engineer engagement with sustainability, this study followed a literature review approach to search, screen and appraise relevant journal articles on this topic. As a result of this research, 30 articles were identified as eligible.
Findings
Based on the theoretical framework for student engagement with sustainability, newly synthesized here, and the content analysis of the 30 papers included in this study, four patterns of engagement were identified: intrapersonal engagement, inter-relational engagement, engagement as connection and disconnection and situated engagement.
Practical implications
This review provides practical recommendations about how to support the engagement of student engineers with sustainability at the levels of the individual, staff, educational programmes and associated curricula. Future research directions are also discussed.
Originality/value
This study contributes a theoretical framework synthesizing student engagement theory with sustainability education. It also describes current characteristics of student engineers’ engagement with sustainability.
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Kang Yan, Hulin Li, Ning Ding, Dan Jiang and Xianghui Meng
Friction and wear are very important factors in predicting the performance of journal bearings, particularly under heavy load in start-up processes. However, there are few…
Abstract
Purpose
Friction and wear are very important factors in predicting the performance of journal bearings, particularly under heavy load in start-up processes. However, there are few relevant studies on the numerical model. This study aims to establish a transient-mixed lubrication model to predict the performance of journal bearings, focusing on the friction and wear behavior under heavy load during start-up.
Design/methodology/approach
The average Reynold equation, three-dimensional energy equation, shear stress model for friction and Archard model for wear are coupled in the transient model by finite difference method. The linear wear simulation method is bought out to reduce the update times and the calculation time.
Findings
The different start-up accelerations and linear wear times set are compared and discussed, which indicates a reasonable start-up acceleration is necessary for journal bearings under heavy load during start-up, and setting linear wear times is an effective method to reduce the simulation time significantly. Furthermore, the wear profile in the start-up process spreads in both the clearance and circumferential directions, but mainly in the clearance direction, which increases the minimum film thickness and affects the friction performance.
Originality/value
This study is of great significance for the numerical prediction of the transient performance of journal bearings during start-up considering friction and wear.
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Yanzhen Wang, Zhongwei Yin, Dan Jiang, Gengyuan Gao and Xiuli Zhang
Water lubrication is significant for its environmental friendliness. Composite journal bearing is liable to deform for the huge pressure of water film. This paper aims to study…
Abstract
Purpose
Water lubrication is significant for its environmental friendliness. Composite journal bearing is liable to deform for the huge pressure of water film. This paper aims to study the influence of elastic deformation on how lubrication functions in water-lubricated journal bearings and to provide references for designing composite journal bearings.
Design/methodology/approach
The combination of computational fluid dynamics and fluid-structure interaction is adopted in this paper to study the lubrication performance of water-lubricated compliant journal bearings. The influences of elasticity modulus and Poisson’s ratio on load-carrying capacity and elastic deformation are studied for different rotational speeds. Predictions in this work are compared with the published experimental results, and the present work agrees well with the experimental results.
Findings
A reference whether elastic deformation should be considered for composite journal bearings is proposed under different working conditions. Besides, a reference to determine water-lubricated plain journal bearings dimensions under different loads and rotational speeds is developed with the effect of both elastic deformation and cavitation being accounted.
Originality/value
The present research provides references as to whether elastic deformation should be considered in operation and to determine compliant journal bearings’ dimensions in the design process.
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Gao Gengyuan, Yin Zhongwei, Jiang Dan and Zhang Xiuli
The purpose of this paper is to improve hydrodynamic load-carrying capacity of a water-lubricated journal bearing by a new bush structure. Water-lubricated bearing is becoming…
Abstract
Purpose
The purpose of this paper is to improve hydrodynamic load-carrying capacity of a water-lubricated journal bearing by a new bush structure. Water-lubricated bearing is becoming more and more popular since it is environmentally friendly and saves energy. However, contrary to oil and grease-lubricated bearings, water-lubricated bearing is limited in many situations due to its low hydrodynamic load-carrying capacity.
Design/methodology/approach
The present article proposes a new bearing bush, with a transition-arc structure, which is favorable for increasing hydrodynamic load-carrying capacity. Hydrodynamic load-carrying capacity was calculated by means of three-dimensional computational fluid dynamics (3-D CFD) analysis. Several variants of a journal bearing with a transition-arc structure of different dimensions are analyzed, while the radial clearance of the bearing, eccentricity ratio and the velocity of the journal remain unchanged.
Findings
The results show that obvious changes are found in hydrodynamic load-carrying capacity of a water-lubricated journal bearing. For different width over diameter (L/D) bearing ratios, the relationship between hydrodynamic load-carrying capacity and the magnitude of the transition-arc structure dimension is researched.
Originality/value
The research presented here leads to a design reference guideline that could be used by the designer engineer to design smart journal bearings for improving the hydrodynamic load-carrying capacity.
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Juanda Surya and Dian Kartika Rahajeng
The purpose of this study is to examine the effect of the religiosity of the chief executive officer (CEO) on Indonesian banks’ performance.
Abstract
Purpose
The purpose of this study is to examine the effect of the religiosity of the chief executive officer (CEO) on Indonesian banks’ performance.
Design/methodology/approach
The research method used was a review of the annual reports of banking companies in Indonesia from 2015 to 2019 and a web-based search to determine the religiosity of the CEOs. This study comprised 88 banking companies in Indonesia that come under the supervision of the Financial Services Authority.
Findings
The results of this study show that banks led by religious CEOs had better financial performance, as measured by their ROA and ROE, than those led by not very spiritual CEOs. These results indicate the importance of religiosity in organizations, especially at the top management level, for achieving better bank performance.
Practical implications
This research results show that religiosity plays an essential role in the banking business sector. This research adds to the literature on CEOs’ characteristics based on their religiosity and the concomitant effect on banking performance.
Originality/value
This study shows how individual religious beliefs influence the corporate behavior of top management, particularly the CEOs, and why this is crucial for organizational decision-making. This study measures an individual's religiosity (i.e. a CEO) based on that individual's actions in their workplace environment.
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HuLin Li, Zhongwei Yin, Dan Jiang and YongJin Li
The purpose of this paper is to achieve attractive fabric composites with excellent tribological performance and investigate the wear mechanisms of these fabric composites sliding…
Abstract
Purpose
The purpose of this paper is to achieve attractive fabric composites with excellent tribological performance and investigate the wear mechanisms of these fabric composites sliding against bearing steel pins under dry sliding process.
Design/methodology/approach
Five different weave density composites were prepared, and the tribological behaviors of these composites were studied at different testing conditions. Scanning electron microscopy, laser microscopy (three-dimensional profile measurements) and energy-dispersive X-ray spectrometry were used to analyze the worn surface morphology, wear volume and elemental content of the transfer films, respectively.
Findings
The composite weave density serves an important influence on tribological behavior. Generally, the wear rate of each composite increased with increasing weave density, and the friction coefficient of each composite decreased with increasing weave density.
Originality/value
Nanoparticle-filled hybrid polytetrafluoroethylene/Kevlar fabric composites with proper weave density have exhibited superior tribological properties in dry sliding conditions. The results that obtained in this paper may offer a reference for others who intend to achieve attractive fabric composites with excellent tribological performance.
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Yongsheng Xiao, Lizhen Huang and Jianjiang Zhou
The purpose of this paper is to solve the azimuth sensitivity of a high-resolution range profile (HRRP), which is one of the biggest obstacles faced by a radar automatic target…
Abstract
Purpose
The purpose of this paper is to solve the azimuth sensitivity of a high-resolution range profile (HRRP), which is one of the biggest obstacles faced by a radar automatic target recognition (RATR) system.
Design/methodology/approach
Aimed at addressing the shortcomings of the equal angular-sector segmentation based on the scatterer model, an adaptive angular-sector segmentation is proposed on the basis of grey incidence analysis (GIA).
Findings
The main conclusions reached are as follows. First, the adaptive angular-sector segmentation in terms of GIA is suitable for RATR based on the HRRP; and, second, the adaptive angular-sector segmentation based on the type-B degree of grey incidence model is better than the Deng-Si degree of grey incidence model and the degree of grey slope incidence model.
Practical implications
The outcome obtained in this paper can be selected for the RATR application.
Originality/value
This paper has been built on the basis of previous research achievements, and a new RATR method of adaptive angular-sector segmentation is presented based on the GIA.
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Jagdeep Singh and Harwinder Singh
The purpose of this paper is to review the literature and provide an overview of the history, evolution and existing research on continuous improvement (CI). It reviews a large…
Abstract
Purpose
The purpose of this paper is to review the literature and provide an overview of the history, evolution and existing research on continuous improvement (CI). It reviews a large number of research papers in this field and presents the overview of various CI implementation practices demonstrated by manufacturing organizations globally.
Design/methodology/approach
The paper systematically categorizes the published literature, analyzes and reviews it methodically.
Findings
The paper reveals the important concepts, case studies and surveys in concerned with CI methodology. The contributions of CI programmes towards improving manufacturing performance of the organizations and CI values that underlies continuous improvement have also been highlighted.
Practical implications
The literature on classification of CI has so far been very limited. The paper reviews a large number of papers in this field and presents the overview of various CI practices demonstrated by manufacturing organizations globally. Further the future implications have also been discussed for the smooth and effective implementation of CI practices in manufacturing organizations.
Originality/value
The paper contains a comprehensive listing of publications on the field in question and their classification. It will be useful to researchers, professionals and others concerned with this subject to understand the significance of CI methodology.
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Jagdeep Singh, Harwinder Singh and Amit Kumar
The purpose of this paper is to uncover the significance of green supply chain management (GSCM) to study the impact lean practices, namely, Kaizen and innovation management…
Abstract
Purpose
The purpose of this paper is to uncover the significance of green supply chain management (GSCM) to study the impact lean practices, namely, Kaizen and innovation management practices on organizational sustainability.
Design/methodology/approach
The subject of green supply chains attracts a growing interest in academic and professional literature since 1990. Questionnaire survey and structured interviews (set of questions) among the industrial professionals and academicians of northern India region have been performed to ascertain the significance of GSCM toward organizational sustainability. Structural equation modeling, Cronbach’s alpha, z-test, correlation and t-test have been used to ascertain the significance of lean practices toward sustaining organization by taking the mediating effect of GSCM.
Findings
The results signify the negative potential of combined Kaizen, innovation management and government policies on environmental thinking through supply chain. The innovation management strategies and Kaizen individually has positive influence on environment supply chain but government policies should be improved to improve the positive impact on environmental thinking through supply chain by decreasing pollution. Economic performance, environmental performance and competitive performance are significantly improved by implementing Kaizen and innovation management through GSCM.
Research limitations/implications
The research is limited to northern India. Moreover, selection of industry and academic organizations has been done on convenient sampling technique.
Originality/value
The paper demonstrates the application of lean techniques, namely, Kaizen and innovation management practices, showing how it can bring real breakthroughs in organizational sustainability through GSCM.