Search results
1 – 10 of 16Qingchao Sun, Xiaokai Mu, Bo Yuan, Jiawen Xu and Wei Sun
This paper aims to distinguish the relationship between the morphology characteristics of different scales and the contact performance of the mating surfaces. Also, an integrated…
Abstract
Purpose
This paper aims to distinguish the relationship between the morphology characteristics of different scales and the contact performance of the mating surfaces. Also, an integrated method of the spectrum analysis and the wavelet transform is used to separate the morphology characteristics of the actual machined parts.
Design/methodology/approach
First, a three-dimensional (3D) surface profilometer is used to obtain the surface morphology data of the actual machined parts. Second, the morphology characteristics of different scales are realized by the wavelet analysis and the power spectral density. Third, the reverse modeling engineering is used to construct the 3D contact models for the macroscopic characteristics. Finally, the finite element method is used to analyze the contact stiffness and the contact area of the 3D contact model.
Findings
The contact area and the nominal contact pressure Pn have a nonlinear relationship in the whole compression process for the 3D contact model. The percentage of the total contact area of the macro-scale mating surface is about 70 per cent when the contact pressure Pn is in the range of 0-100 MPa, and the elastic contact area accounts for the vast majority. Meanwhile, when the contact pressure Pn is less than 10MPa, the influence factor (the relative error of contact stiffness) is larger than 50 per cent, so the surface macro-scale morphology has a weakening effect on the normal contact stiffness of the mating surfaces.
Originality/value
This paper provides an effective method for the multi-scale separation of the surface morphology and then lays a certain theoretical foundation for improving the surface quality of parts and the morphology design.
Details
Keywords
Huimei Zhang, Jiawen Zhang, Yan Zhang, Xu Ye, Yuanyuan Li and Ping Wang
In this paper, a new flexible piezoresistive pressure sensor which uses non-woven fabric as the flexible substrate and sliver nanowires (AgNWs) as the conductive materials was…
Abstract
Purpose
In this paper, a new flexible piezoresistive pressure sensor which uses non-woven fabric as the flexible substrate and sliver nanowires (AgNWs) as the conductive materials was reported.
Design/methodology/approach
The compression test of the pressure sensors was carried out at different compression frequencies and found that the sensors had more than 5,000 times reusability at high frequency.
Findings
When pressure sensors were applied to different parts of the human body, such as fingers, elbows, knees and throat, the sensors respond differently to different degrees of movement.
Originality/value
The proposed pressure sensor has broad application prospects in the human motion detection.
Details
Keywords
Jian Liu, Mengyao Xu, Wenxiong Xi, Jiawen Song, Shibin Luo and Bengt Ake Sunden
Endwall film cooling protects vane endwall by coolant coverage, especially at the leading edge (LE) region and vane-pressure side (PS) junction region. Strong flow impingement and…
Abstract
Purpose
Endwall film cooling protects vane endwall by coolant coverage, especially at the leading edge (LE) region and vane-pressure side (PS) junction region. Strong flow impingement and complex vortexaa structures on the vane endwall cause difficulties for coolant flows to cover properly. This work aims at a full-scale arrangement of film cooling holes on the endwall which improves coolant efficiency in the LE region and vane-PS junction region.
Design/methodology/approach
The endwall film holes are grouped in four-holes constructal patterns. Three ways of arranging the groups are studied: based on the pressure field, the streamlines or the heat transfer field. The computational analysis is done with the k-ω SST model after validating the turbulence model properly.
Findings
By clustering the film cooling holes in four-holes patterns, the ejection of the coolant flow is stronger. The four-holes constructal patterns also improve the local coolant coverage in the “tough” regions, such as the junction region of the PS and the endwall. The arrangement based on streamlines distribution can effectively improve the coolant coverage and the arrangement based on the heat transfer distribution (HTD) has benefits by reducing high-temperature regions on the endwall.
Originality/value
A full-scale endwall film cooling design is presented considering interactions of different film cooling holes. A comprehensive model validation and mesh independence study are provided. The cooling holes pattern on the endwall is designed as four-holes constructal patterns combined with several arrangement choices, i.e. by pressure, by heat transfer and by streamline distributions.
Details
Keywords
Feng Dong, Xiao Wang and Jiawen Chen
This study aims to investigate the impact of family ownership on cooperative research and development (R&D). Drawing on the ability and willingness paradox framework in family…
Abstract
Purpose
This study aims to investigate the impact of family ownership on cooperative research and development (R&D). Drawing on the ability and willingness paradox framework in family business research, the authors suggest that family ownership influences cooperative R&D via two opposing mechanisms: power concentration and wealth concentration. It also deepens the current understanding of the boundary conditions of informal institutions for the impact of family ownership on cooperative R&D by investigating the moderating role of political ties.
Design/methodology/approach
The authors analyze a panel of 610 Chinese manufacturing family firms and 2,127 firm-year observations from 2009 to 2017. Fixed effects regression analysis is used to test the hypotheses, with the two-stage Heckman model to address sample selection bias.
Findings
The research findings indicate that family ownership has an inverted U-shaped relationship with cooperative R&D and political ties moderate the relationship in such a way that the inverted U-shaped relationship will be steeper in firms with more political ties than in firms with fewer political ties.
Practical implications
Family ownership influences firms’ cooperative R&D through the positive effect of power concentration and the negative effect of wealth concentration. Family owners should, therefore, take advantage of concentrated power, for instance, by adapting quickly and committing sufficient resources to cooperative R&D opportunities, while controlling path-dependent relationship development caused by concentrated family wealth. The effect of political ties on the relationship between family ownership and cooperative R&D is found to be a double-edged sword.
Originality/value
This study extends the ability and willingness paradox framework and provides novel insights into cooperative R&D in family businesses by integrating power concentration and wealth concentration associated with family ownership. Moreover, this study provides a contingency perspective and introduces the moderating role of political ties in shaping cooperative R&D in family firms.
Details
Keywords
Lijun Dong, Naichao Chen, Jiawen Liang, Tingting Li, Zhanlin Yan and Bing Zhang
The purpose of this study is to provide an in-depth understanding about the indoor-orbital electrical inspection robot, which is useful for motivating the further investigation on…
Abstract
Purpose
The purpose of this study is to provide an in-depth understanding about the indoor-orbital electrical inspection robot, which is useful for motivating the further investigation on the inspection of electrical equipment. Currently, electric energy has a strong correlation with the economic development of the country. Intelligent substations play an important role in the transmission and distribution of the electricity; the maintenance of the substation has attracted intensive attention due to the requirement of reliability and safety. The indoor-orbital electrical inspection robot has increasingly become the main tool to realize the unmanned. Hence, a systematic review is conducted systematically reviewing the current technical status of the indoor-orbital electrical inspection robot and discuss the existed problems.
Design/methodology/approach
In this paper, the most essential achievements in the field of indoor-orbital electrical inspection robots were reported to present the current status, and the mechanical structures and key inspective technologies were also discussed.
Findings
Four recommendations are provided from the analyzed review, which have made constructive comments on the overall structural design, functionality, intelligence and future development direction of the indoor-orbital electrical inspection robot, respectively.
Originality/value
To the best of the authors’ knowledge, this is the first systematic review study on indoor-orbital electrical inspection robots; it fills the theoretical gap and proffers design ideas and directions for the development of the indoor-orbital electrical inspection robot.
Details
Keywords
Ying Jiang, Junyun Liao, Jiawen Chen, Yanghong Hu and Peng Du
Users' knowledge sharing provides valuable resources for brand community participants and is, therefore, critical for the viability of virtual brand communities. Drawing from both…
Abstract
Purpose
Users' knowledge sharing provides valuable resources for brand community participants and is, therefore, critical for the viability of virtual brand communities. Drawing from both self-determination theory (SDT) and psychological ownership theory, the paper aims to investigate the impact of fulfillment of three basic psychological needs on brand users' knowledge-sharing behavior and examines psychological ownership as a mediator.
Design/methodology/approach
Survey data consisting of 316 valid responses were collected from users of Huawei Pollen Club Community. Confirmatory factor analysis (CFA) confirmed the reliability and validity of measures, and hierarchical linear regression and bootstrapping were used to test all hypotheses.
Findings
Fulfillment of the need for autonomy, relatedness and competence in a virtual brand community boosts users' psychological ownership and has a positive influence on their knowledge-sharing behavior. Furthermore, psychological ownership partially mediates the relationships between the fulfillment of psychological needs and knowledge-sharing behavior. In addition, the authors found that when users participate in more offline brand activities, the positive impact of the fulfillment of the need for relatedness on psychological ownership is strengthened, while the positive impact of the fulfillment of the need for autonomy on psychological ownership is weakened.
Originality/value
The paper contributes to the existing literature by exploring the relationships between fulfilling users' three basic psychological needs and their knowledge-sharing behavior through the mediating role of psychological ownership. The authors also provide insight into how offline brand activities interact with the fulfillment of psychological needs in virtual brand communities.
Details
Keywords
Jiawen Chen, Pengfei Li and Linlin Liu
This study aims to examine the employment practices of family firms in emerging markets. Drawing from the social exchange theory, the authors propose that transgenerational…
Abstract
Purpose
This study aims to examine the employment practices of family firms in emerging markets. Drawing from the social exchange theory, the authors propose that transgenerational control intention enhances the motivation for family owners to engage in favorable employment practices as inducement for future contribution of employees.
Design/methodology/approach
Multilevel regression models were applied to test the hypotheses with a sample of 3033 Chinese private family firms.
Findings
The results show that the employment practices of family firms are positively associated with transgenerational control intention, and the effect of transgenerational control intention is contingent on regional social trust.
Originality/value
This study highlights the role of transgenerational control intention of family owners in motivating favorable employment in family firms. The study adds nuance to the variances in employment behaviors of family firms as well as the family owner-employee exchange relationship in emerging markets.
Details
Keywords
This study aims to empirically analyze the impact of technological innovation on the quantity and quality of employment in the hospitality industry.
Abstract
Purpose
This study aims to empirically analyze the impact of technological innovation on the quantity and quality of employment in the hospitality industry.
Design/methodology/approach
Using the data of 30 provinces in China from 2010 to 2020, this paper makes an empirical analysis through the fixed effect model.
Findings
The results show that process innovation has a significant positive impact on employment quantity, while product innovation has a significant negative impact on employment quantity. The creative effect of process innovation and the substitution effect of product innovation offset each other, so in the long run, the impact of technological innovation on employment quantity is not significant. However, technological innovation has significantly improved the employment quality of the hospitality industry.
Practical implications
Because technological innovation has replaced part of the labor force, hospitality could guide the labor force in a positive direction. To promote innovation and retain talents, hotels should train employees’ digital thinking and attract high-skilled talents.
Originality/value
This research is unique in using process innovation and product innovation as the main measurement indicators of technological innovation, unlike previous studies that often relied on technological progress to conclude.
Details
Keywords
Jiawen Chen, Han Wu and Xiaotao Yao
The purpose of this paper is to examine firms’ early adoption decision regarding new practices, and what social factors – that is social status and political legitimacy – may…
Abstract
Purpose
The purpose of this paper is to examine firms’ early adoption decision regarding new practices, and what social factors – that is social status and political legitimacy – may influence decision processes under ambiguity.
Design/methodology/approach
The study examines outside director presence among publicly listed firms in China between 1991 and 2000, using discrete time – event history analysis based on observation of 770 firms.
Findings
Social status negatively influences early adoption decisions through the expectation of status enhancement, while political legitimacy is also influential because early adoptions are more attractive to firms in need of political access. Moreover, a firm’ political legitimacy moderates the effect of social status, due to their resource dependence on different stakeholders.
Originality/value
This study’s findings provide important insights for research on diffusion models of new practices by identifying the social processes during early diffusion, and articulating different effects of status and legitimacy. It further emphasizes the sociopolitical perspectives and social motives of governance structure changes in emerging economies.
Details
Keywords
Junyun Liao, Jiawen Chen and Fei Jin
Recent years have witnessed the popularity of social free sampling (SFS). That is, firms on social commerce platforms (e.g. Amazon Vine and Pconline Try) offer free sample…
Abstract
Purpose
Recent years have witnessed the popularity of social free sampling (SFS). That is, firms on social commerce platforms (e.g. Amazon Vine and Pconline Try) offer free sample products for consumers' applications, and the selected applicants are required to write a product trial report on the sites as a return. The main advantage of SFS is to leverage users' product trial reports to increase product exposure and attract prospective consumers. Thus, product trial reports play a central role in SFS. Despite that scholars have examined the rating bias of product trial reports in recent years' knowledge concerning how product trial reports influence user (i.e. readers of product trial reports) engagement remains sparse. To address the research gap, this paper aims to examine the drivers of user engagement with product trial reports.
Design/methodology/approach
This study utilized the Poisson regression model to analyze 3,419 trial reports collected from a well-known Chinese SFS site.
Findings
Based on the ELM model, the empirical results indicate that product rating, vividness, opinion balance, and reputation of the trial user are positively associated with user engagement. However, longer reports and reports with higher emotional intensity lead to weaker user engagement. Furthermore, product prices strengthen the positive impact of opinion balance but weaken the positive impact of trial users' reputations.
Originality/value
This study is among one of the first studies to investigate the impact of trial reports on user engagement in SFS. It yields actionable guidelines for SFS campaigns.
Details