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Article
Publication date: 27 June 2018

Xia He, Wenling Liao, Guorong Wang, Lin Zhong and Mengyuan Li

The purpose of this study is to investigate the influence of texture on hydrodynamic lubrication performance of slide surface from the perspective of skewness and kurtosis.

302

Abstract

Purpose

The purpose of this study is to investigate the influence of texture on hydrodynamic lubrication performance of slide surface from the perspective of skewness and kurtosis.

Design/methodology/approach

Hydrodynamic lubrication theoretical model of textured surface was established based on two-dimensional Reynolds equation, and finite difference algorithm was used as the numerical approach in the paper. Skewness and kurtosis of surface were obtained by discrete calculation.

Findings

Numerical analysis results show that the influence law of texture types on skewness, kurtosis and hydrodynamic lubrication was the more negative skewness and higher kurtosis, the better hydrodynamic lubrication performance when texture cross section contour and geometric parameters were the same. Similarly, the same influence law of skewness, kurtosis and hydrodynamic lubrication performance by texture cross-section contour was observed. However, it was unable to evaluate the effect of texture angle on hydrodynamic lubrication performance of textured surface from the perspective of skewness and kurtosis.

Originality/value

This paper confirms the feasibility of evaluating influence of texture types and texture cross-section contour on hydrodynamic lubrication performance from the perspective of skewness and kurtosis and provides a way to optimize texture type and texture cross section.

Details

Industrial Lubrication and Tribology, vol. 70 no. 5
Type: Research Article
ISSN: 0036-8792

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Article
Publication date: 26 September 2019

Feng-Xia He, Li Dai, Qisen Chen, Yu Liu and Zhong Luo

Since robot’s structural stiffness is usually less than 1 N/µm, mode coupling chatter occurs frequently during robotic milling process, and chatter frequency is close to the…

360

Abstract

Purpose

Since robot’s structural stiffness is usually less than 1 N/µm, mode coupling chatter occurs frequently during robotic milling process, and chatter frequency is close to the natural frequency of the robot itself. Chatter not only affects the surface quality but also damages the robot and reduces the positioning accuracy. Therefore, it is necessary to predict chatter in robotic machining process.

Design/methodology/approach

A three-dimensional dynamic model for robot’s spatial milling plane is established, and a corresponding stability criterion is obtained. First, the cutting force in milling plane is transformed into the coordinate system of the robot principal stiffness direction based on homogeneous transformation matrix. Then the three-dimensional stability criterion under milling process can be obtained by using system stability analysis. Furthermore, the circle diagram of mode coupling chatter stability is drawn. Each feeding direction’s stability under the two processing forms, referred as spindle vertical milling and spindle horizontal milling, is analyzed.

Findings

The experimental results verify that the three-dimensional stability criterion can avoid chatter by selecting machining feed direction in stable area.

Originality/value

This paper established a three-dimensional dynamic model in robot’s spatial milling plane and proposed a three-dimensional stability criterion according to the Routh criterion. The work is also expected to be an efficient tool in the development of robotic milling technology.

Details

Industrial Robot: the international journal of robotics research and application, vol. 47 no. 1
Type: Research Article
ISSN: 0143-991X

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Article
Publication date: 4 February 2025

Jinghan Xu, Shengguo Xia, Lixue Chen, Anbang Gu, Hongdan Yang and Chengxian Li

The purpose of this paper is to investigate the moving boundary conditions on the sliding armature and rail (A/R) interface. As the computational domains involve both moving and…

5

Abstract

Purpose

The purpose of this paper is to investigate the moving boundary conditions on the sliding armature and rail (A/R) interface. As the computational domains involve both moving and stationary conductors, Lagrangian description and backward difference schemes are adopted for spatial and temporal discretization, arising discontinuities in variables. The proposed formulation can compute the current distribution under high velocities (∼km/s) without numerical oscillations and avoids mesh re-generation, saving computational resources.

Design/methodology/approach

The governing equations in Lagrangian description, backward difference schemes and derivations of moving boundary conditions are shown in detail. The interface matrix is explicitly enforced on the whole domain matrix and pseudocodes are presented for implementation. Moreover, shifted interpolated quantity method is proposed to deal with unevenly sized mesh, which can calculate acceleration scenarios and save computation resources under high velocities. Comparative calculations with previous methods under low velocities are conducted to verify the correctness of computational and physical models.

Findings

The current distributions with constant velocities are consistent with previous two-dimensional and low-velocity studies, further verifying the correctness of the method. The three-dimensional high-velocity results show that the current tends to concentrate near the trailing edge of A/R interface and diffuses into the bulks over time, with higher velocity contributing to less significant current diffusion. The velocity skin effect precedes the magnetic diffusion, conductivity and other factors that influence the current distribution.

Originality/value

The proposed methods can compute the current distributions in railgun under velocity accelerated to over 2,000 m/s, and the results provide more comprehensive understandings of the current evolution process under velocity skin effect in railgun.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 44 no. 1
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 11 January 2023

Peixu He, Amitabh Anand, Mengying Wu, Cuiling Jiang and Qing Xia

The purpose of this paper is to investigate how voluntary citizenship behaviour towards an individual (VCB-I) is linked with vicious knowledge hiding (VKH), and why members…

1233

Abstract

Purpose

The purpose of this paper is to investigate how voluntary citizenship behaviour towards an individual (VCB-I) is linked with vicious knowledge hiding (VKH), and why members, within a mastery climate, tend to participate in less VKH after their engaging in VCB-I. The authors, according to the moral licensing theory, propose that moral licensing mediates the relationship between VCB-I and VKH, and that a mastery climate weakens the hypothesised link via moral licensing.

Design/methodology/approach

This study surveys 455 valid matching samples of subordinates and supervisors from 77 working teams in China at two time points and explores the relationship between VCB and VKH, as well as the underlying mechanism. A confirmatory factor analysis, bootstrapping method and hierarchical linear model were used to validate the research hypotheses.

Findings

The results show that VCB-I has a significant positive effect on VKH; moral credentials play a mediating role in the relationship between VCB-I and VKH; and the mastery climate moderates the positive effect of moral credentials on VKH and the mediating effect of moral credentials. In a high-mastery climate, the direct effect of moral credentials on VKH and the indirect influence of VCB-I on VKH through moral credentials are both weakened, and conversely, both effects are enhanced in a low-mastery climate. However, contrary to the expected hypothesis, moral credits do not mediate the relationship between VCB-I and VKH, which may be due to the differences in the mechanisms between the two moral licensing models.

Originality/value

Prior research has mainly focused on the “victim-centric” perspective to examine the impacts of others’ behaviour on employees’ knowledge hiding. Few works have used the “actor-centric” perspective to analyse the relationship between employees’ prior workplace behaviour and their subsequent knowledge hiding intention. In addition, this study enriches the field research on the voluntary aspects of organisational citizenship behaviour, which differs from its involuntary ones.

Available. Open Access. Open Access
Article
Publication date: 7 December 2017

Xiao-jun Wang, Jian-yun Zhang, Shamsuddin Shahid, Lang Yu, Chen Xie, Bing-xuan Wang and Xu Zhang

The purpose of this paper is to develop a statistical-based model to forecast future domestic water demand in the context of climate change, population growth and technological…

2403

Abstract

Purpose

The purpose of this paper is to develop a statistical-based model to forecast future domestic water demand in the context of climate change, population growth and technological development in Yellow River.

Design/methodology/approach

The model is developed through the analysis of the effects of climate variables and population on domestic water use in eight sub-basins of the Yellow River. The model is then used to forecast water demand under different environment change scenarios.

Findings

The model projected an increase in domestic water demand in the Yellow River basin in the range of 67.85 × 108 to 62.20 × 108 m3 in year 2020 and between 73.32 × 108 and 89.27 × 108 m3 in year 2030. The general circulation model Beijing Normal University-Earth System Model (BNU-ESM) predicted the highest increase in water demand in both 2020 and 2030, while Centre National de Recherches Meteorologiques Climate Model v.5 (CNRM-CM5) and Model for Interdisciplinary Research on Climate- Earth System (MIROC-ESM) projected the lowest increase in demand in 2020 and 2030, respectively. The fastest growth in water demand is found in the region where water demand is already very high, which may cause serious water shortage and conflicts among water users.

Originality/value

The simple regression-based domestic water demand model proposed in the study can be used for rapid evaluation of possible changes in domestic water demand due to environmental changes to aid in adaptation and mitigation planning.

Details

International Journal of Climate Change Strategies and Management, vol. 10 no. 3
Type: Research Article
ISSN: 1756-8692

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Article
Publication date: 20 March 2017

Hongdan Zhao and Qing Xia

The purpose of this paper is to explore the curvilinear relationship between workplace ostracism (supervisor ostracism and co-worker ostracism) and knowledge hoarding by using the…

1999

Abstract

Purpose

The purpose of this paper is to explore the curvilinear relationship between workplace ostracism (supervisor ostracism and co-worker ostracism) and knowledge hoarding by using the conservation of resources theory. In addition, the paper predicts one possible situational context (political skill) that may influence employees’ reaction to ostracism.

Design/methodology/approach

Using a two-wave research design, the authors collected data from 240 samples in a Chinese diversified company. Hierarchical regression models were used to test the hypotheses.

Findings

The authors found that the relationship between workplace ostracism (supervisor ostracism and co-worker ostracism) and knowledge hoarding was U-shaped. Moreover, political skill moderated the linkage between workplace ostracism and knowledge hoarding such that the U-shaped association was stronger for people higher, rather than lower, in political skill.

Originality/value

By exploring a curvilinear relationship between ostracism and knowledge hoarding, the study enriches the knowledge hoarding literature by adding a substantive predictor of knowledge hoarding. The findings can also extend the workplace ostracism literature by providing a new conceptual analysis of interpreting the inconsistent findings involving the influence of workplace ostracism. Moreover, identifying political skill as a moderator can gain a better understanding of when and why an ostracized employee’s knowledge hoarding behavior can be less likely.

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Article
Publication date: 20 June 2022

Tehreem Fatima, Ahmad Raza Bilal, Muhammad Kashif Imran and Arslan Ayub

Coworker relationships are important in every organization and especially in higher educational institutions (HEIs); however, ostracism is one of the factors that deteriorate…

501

Abstract

Purpose

Coworker relationships are important in every organization and especially in higher educational institutions (HEIs); however, ostracism is one of the factors that deteriorate these relationships. This study aims to analyse the impact of coworker ostracism on coworker directed knowledge hiding through the mediating role of relational identification and the moderating role of perceived harming intention.

Design/methodology/approach

A total of 241 teaching faculty members working in HEIs of Lahore were surveyed. By using the bootstrapping technique, mediation and moderated mediation analysis was conducted via PROCESS models 4 and 7.

Findings

The results concluded that perceived harming intention moderates the indirect relationship between coworker ostracism and coworker-directed knowledge hiding through relational identification with coworkers. Such that when more harmful intention is perceived the impact of coworker ostracism on coworker-directed knowledge hiding through reduced relational identification would be stronger.

Practical implications

This study offers managerial implications for HEIs management and faculty for reducing coworker ostracism, improving relational identification and training about attribution techniques to minimize the impact of ostracism on knowledge hiding.

Originality/value

This study has complimented and augmented the research strand of ostracism and knowledge hiding research from emphasizing lateral workplace relationships. Intertwining the Conservation of Resources Theory with Attribution theory a novel insight into the above-stated association is illuminated through the mediating role of relational capital and moderating role of perceived harming intention.

Details

International Journal of Educational Management, vol. 36 no. 6
Type: Research Article
ISSN: 0951-354X

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Article
Publication date: 3 August 2020

Senmao Xia, Yu Xiong, Min Zhang, James Cornford, Yipeng Liu, Ming K. Lim, Dongmei Cao and Fengwen Chen

The purpose of this paper is to empirically explore the mechanisms through which Chinese National Science Parks' (NSPs) services facilitate returnee entrepreneurs' (REs…

417

Abstract

Purpose

The purpose of this paper is to empirically explore the mechanisms through which Chinese National Science Parks' (NSPs) services facilitate returnee entrepreneurs' (REs) acquisition of resources for their new ventures. Resource acquisition is crucial for new ventures, but it inevitably leads to significant costs increase. Although the NSPs offer various services to REs to reduce these costs, they still struggle to find the right mix of services.

Design/methodology/approach

From the transaction cost's perspective, an exploratory multiple-case study was conducted with data collected from six NSPs in China.

Findings

The results reveal that four types of NSP services (mentoring and training, social event, promotion of REs and accreditation of resource holders (RHs)) have both individual and joint effects on reducing REs' resource acquisition costs. Specifically, the “accreditation of RHs” service directly helps REs reduce search costs. The combination of “accreditation of RHs”, “promotion of REs” and “social event” services help REs and RHs to establish guanxi. Further, guanxi, working along with the “mentoring and training” service, helps REs to reduce contracting, monitoring and enforcement costs.

Originality/value

This study is among the first to explore the matching mechanisms between science parks’ services and entrepreneurs' cost reduction. This helps reconcile the inconsistent findings on science parks' effect by explaining why some NSPs are able to provide strong support to REs while others are less successful. In addition, the findings are useful for NSPs to develop the right mix of tailored services for REs. Finally, REs will find this study useful to evaluate which NSP is a more suitable location for their new ventures.

Details

International Journal of Entrepreneurial Behavior & Research, vol. 26 no. 7
Type: Research Article
ISSN: 1355-2554

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Book part
Publication date: 28 October 2024

Miltiadis D. Lytras, Andreea Claudia Serban, Afnan Alkhaldi, Tahani Aldosemani and Sawsan Malik

Digital transformation (DT) has become a top priority for higher education (HE), driven by technological advances such as artificial intelligence (AI), artificial general…

Abstract

Digital transformation (DT) has become a top priority for higher education (HE), driven by technological advances such as artificial intelligence (AI), artificial general intelligence (AGI) and Generative Open AI. It serves as a catalyst for the reshaping of mainstream processes in academic institutions, emphasizing teamwork, collaborative projects and critical thinking in research, learning and assessment strategies. In this chapter, the authors contextualize the use of this DT, highlighting its potential to improve learning experiences, business efficiency and upskill students and faculty. The holistic approach to DT as an enabler of excellence in HE is based on four pillars of excellence and impact: Business process reengineering, learning excellence and skill building, research capacity and innovation and partnership and outlook. DT needs the development of efficient, resilient, flexible and adaptable strategies and a strong collaboration between all the actors involved in the process to ensure the coherence, the sustainability and alignment of the objectives, means and targets with the real needs of the learners, tutors, labor market and society as whole. The authors’ bold proposition consists of a model for the strategy design of DT in universities and colleges organized in three dimensions: understand, strategize, deploy and exploit. Each dimension emphasizes different stages of the process: understanding emerging technologies and their impact on HE, collaboration between stakeholders, strategy and priorities formulation, roadmap of implementation, deployment and exploitation of digital technologies, etc. The ongoing DT in HE will continue to create an extensive shift in educational processes – learning, teaching, research and management. Institutions around the world are taking bold initiatives to adapt to this rapidly changing environment, emphasizing the importance of readiness for technological changes, system development, inclusive and sustainable transformation.

Details

Digital Transformation in Higher Education, Part A
Type: Book
ISBN: 978-1-83549-480-6

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Article
Publication date: 24 April 2024

Zhihong Tan, Ling Yuan, Junli Wang and Qunchao Wan

This study aims to investigate the negative interpersonal antecedents, emotional mediators and boundary conditions of knowledge sabotage behavior.

477

Abstract

Purpose

This study aims to investigate the negative interpersonal antecedents, emotional mediators and boundary conditions of knowledge sabotage behavior.

Design/methodology/approach

The authors collected data from 275 Chinese employees using convenience sampling and snowball sampling across three stages. Subsequently, the authors used both hierarchical regression and bootstrap methods to test the proposed hypotheses.

Findings

The results confirmed that workplace ostracism has positive effects on employee knowledge sabotage behavior both directly and via employee anger. In addition, the authors found that employee bottom-line mentality (BLM) moderates not only the direct effect of workplace ostracism on employee anger but also the indirect effect of employee anger in this context. Employee conscientiousness moderates only the direct effect of workplace ostracism on employee anger and does not moderate the indirect effect.

Originality/value

To the best of the authors’ knowledge, this study not only explores the influence of workplace ostracism on employee knowledge sabotage behavior for the first time but also elucidates the underlying emotional mechanisms (anger) and boundary conditions (employee BLM and conscientiousness) by which workplace ostracism influences employee knowledge sabotage behavior, thus deepening the understanding of how knowledge sabotage emerges in organizations.

Details

Journal of Knowledge Management, vol. 28 no. 5
Type: Research Article
ISSN: 1367-3270

Keywords

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