Qi Zheng Li, Yu Zuo, Jing Mao Zhao, Yu Ming Tang, Xu Hui Zhao and Jin Ping Xiong
By adding a Ce salt and an Nd salt to an anodizing electrolyte, modified anodic films are obtained on aluminum surfaces. This paper aims to study the effects of rare‐earth…
Abstract
Purpose
By adding a Ce salt and an Nd salt to an anodizing electrolyte, modified anodic films are obtained on aluminum surfaces. This paper aims to study the effects of rare‐earth elements on the corrosion resistance of the anode film.
Design/methodology/approach
The crystalline film was studied by X‐ray diffraction. The methods of scanning electron microscope, energy dispersive X‐ray analysis, electrochemical polarization, and electrochemical impedance spectroscopy (EIS) were used to characterize the properties of the films.
Findings
After rare‐earth element modification, the pores of the porous layer were very evidently smaller, the anodic film was more compact, and the thickness and hardness of the films had increased. The corrosion resistance of the anodic films modified with rare‐earth elements clearly was improved in neutral, acidic, and basic NaCl solutions. Ce showed a better effect than Nd in increasing the corrosion resistance of the films, and the film modified with Ce+Nd showed the highest corrosion resistance. EIS analysis showed that the impedances of both the barrier layer and porous layer of the anodic films increased after modification with the rare‐earth elements, indicating that the anodizing process was affected by the presence of the rare‐earth elements.
Originality/value
The results presented in this paper offer a foundation for further research and application of rare‐earth elements in aluminum anodic oxide films.
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Yida Liu, Jie Zhao, Xiaoyu Yang, Yanhong Gu and Zihao Yang
The purpose of this paper is to improve the corrosion resistance of the 6061-Al alloy as the battery pack material for electric vehicles, and the nano-SiC/MAO composite coating…
Abstract
Purpose
The purpose of this paper is to improve the corrosion resistance of the 6061-Al alloy as the battery pack material for electric vehicles, and the nano-SiC/MAO composite coating was prepared.
Design/methodology/approach
The corrosion resistance of coatings was evaluated by the global electrochemical test, and the local electrochemical impedance spectroscopy (LEIS) was used to study the local corrosion mechanism. The laser confocal microscope, scanning electron microscope and X-ray diffractometer (XRD) were used to characterise coatings.
Findings
Results showed that the impedance of nano-SiC/MAO coating was 1–2 times higher than MAO coating, and the main corrosion product was Al(OH)3. LEIS results showed that the impedance of the nano-SiC/MAO coating was two times higher than the MAO coating. The defective SiC/Micro-arc oxidation coating still had high corrosion resistance compared to the MAO coating.
Originality/value
The physical model of the local corrosion mechanism for SiC/MAO composite coating in “cavity-fracture collapse” mode was proposed.
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Yuanhang Yang, Gang Feng, Yanhong Gu, Jie Zhao and Jian Liang
Aluminum alloy is susceptible to chloride ion attack in sea water, resulting in pitting damage and hence serious security risks for the related applications. To improve the…
Abstract
Purpose
Aluminum alloy is susceptible to chloride ion attack in sea water, resulting in pitting damage and hence serious security risks for the related applications. To improve the corrosion resistance of Al alloy, micro-arc oxidation (MAO) technology has been developed to produce a protective dense oxide layer on top of Al alloy. However, the mechanism of MAO-induced corrosion resistance is still not fully understood, particularly on local corrosion issue. This paper aims to focus on comprehensively studying the corrosion-resistance mechanism by a series of technologies.
Design/methodology/approach
The corrosion behavior of samples was studied by open circuit potential (OCP), potentiodynamic polarization (PDP), electrode impedance spectroscopy (EIS) and localized electrode impedance spectroscopy (LEIS) tests in NaCl solution.
Findings
The MAO-coated Al alloy shows a more positive corrosion potential and a higher corrosion current density compared to the untreated counterpart, indicating a significantly enhanced corrosion-resistance. The study of surface morphology and structure also suggest significantly enhanced corrosion-resistance due to the MAO treatment.
Originality/value
Based on the results, a new corrosion model was proposed to describe the influence of MAO treatment on the corrosion process and corrosion mechanism of Al alloy, providing insights on the design of the corrosion-resistance coating for metallic alloys in marine applications.
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Shan Liu, Jing Tan, Hongyi Mao and Yeming Gong
With increasing globalization, supply chain management in various national cultures requires understanding. This study aims to examine the moderating effects of individualistic…
Abstract
Purpose
With increasing globalization, supply chain management in various national cultures requires understanding. This study aims to examine the moderating effects of individualistic and uncertainty avoidance cultures on the relationship between supply chain integration (SCI) and different dimensions of firm performance (i.e. flexibility and financial).
Design/methodology/approach
This study collected 124 pairwise survey data from supply chain and senior managers of retail firms in 35 countries. Hofstede’s national culture index was used to examine the moderating effects. Structural equation modeling and regression analysis were used to test the model.
Findings
Results corroborate that in a higher uncertainty avoidance culture, the positive influence of SCI on flexibility performance is stronger, but that on financial performance is weaker. By contrast, individualism reduces the positive influence of SCI on financial performance, but does not moderate that on flexibility performance.
Originality/value
This paper proposes a contingent model for SCI-performance relationships by integrating the relational view and the national cultural perspective. Critical national cultural dimensions moderate the effects of SCI on flexibility and financial performance. Therefore, operational managers should design differential SCI strategies in various cultural settings.
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Guangqian Ren, Man Jing, Li Liu and Minna Zheng
Can state-owned equity participation inhibit private enterprises’ greenwashing behavior? If so, what are the mechanisms involved? Is there any difference in the impact of…
Abstract
Purpose
Can state-owned equity participation inhibit private enterprises’ greenwashing behavior? If so, what are the mechanisms involved? Is there any difference in the impact of state-owned equity participation on private enterprises’ greenwashing behavior in different contexts? The answers to the above questions not only fill the existing research gaps but also provide new research ideas for greenwashing governance in developing countries.
Design/methodology/approach
Using a sample of Chinese A-share listed private enterprises from 2011 to 2022, we examine the impact of state-owned equity participation on private enterprises’ greenwashing behavior.
Findings
The results suggest that state-owned equity participation can significantly inhibit private enterprises’ greenwashing behavior. Mechanism analysis shows that state-owned equity participation suppresses private enterprises’ greenwashing behavior by alleviating financing constraints through the resource effect and reducing managerial myopia through the governance effect. Moderating effect analysis indicates that media attention can strengthen the inhibitory effect of state-owned equity participation on private enterprises’ greenwashing behavior. Heterogeneity analysis shows that the inhibitory effect of state-owned equity participation on private enterprises’ greenwashing behavior is more significant in areas with a low degree of marketization and non-heavy-polluting industries.
Originality/value
The findings enrich the governance factors of private enterprises’ greenwashing conduct from the standpoint of diverse shareholders, assist developing countries in formulating more specific policy goals and provide important insights into global environmental governance practices.
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Futao Zhao, Zhong Yao, Jing Luan and Hao Liu
The purpose of this paper is to propose a methodology to construct a stock market sentiment lexicon by incorporating domain-specific knowledge extracted from diverse Chinese media…
Abstract
Purpose
The purpose of this paper is to propose a methodology to construct a stock market sentiment lexicon by incorporating domain-specific knowledge extracted from diverse Chinese media outlets.
Design/methodology/approach
This paper presents a novel method to automatically generate financial lexicons using a unique data set that comprises news articles, analyst reports and social media. Specifically, a novel method based on keyword extraction is used to build a high-quality seed lexicon and an ensemble mechanism is developed to integrate the knowledge derived from distinct language sources. Meanwhile, two different methods, Pointwise Mutual Information and Word2vec, are applied to capture word associations. Finally, an evaluation procedure is performed to validate the effectiveness of the method compared with four traditional lexicons.
Findings
The experimental results from the three real-world testing data sets show that the ensemble lexicons can significantly improve sentiment classification performance compared with the four baseline lexicons, suggesting the usefulness of leveraging knowledge derived from diverse media in domain-specific lexicon generation and corresponding sentiment analysis tasks.
Originality/value
This work appears to be the first to construct financial sentiment lexicons from over 2m posts and headlines collected from more than one language source. Furthermore, the authors believe that the data set established in this study is one of the largest corpora used for Chinese stock market lexicon acquisition. This work is valuable to extract collective sentiment from multiple media sources and provide decision-making support for stock market participants.
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Dangshu Wang, Zhimin Guan, Jing Wang, Menghu Chang, Licong Zhao and Xinxia Wang
This study aims to solve the problem of high output voltage fluctuation and low efficiency caused by the misalignment of the magnetic coupling structure in the wireless charging…
Abstract
Purpose
This study aims to solve the problem of high output voltage fluctuation and low efficiency caused by the misalignment of the magnetic coupling structure in the wireless charging system for electric vehicles. To address these issues, this paper proposes a dual LCC-S wireless power transfer (WPT) system based on the double-D double-layer quadrature (DDDQ) coil, which can realize the anti-misalignment constant voltage output of the system.
Design/methodology/approach
First, this paper establishes the equivalent circuit of a WPT system based on dual LCC-S compensation topology and analyzes its constant-voltage output characteristics and the relationship between system transmission efficiency and coupling coefficient. 1. Quadruple D (Ahmad et al., 2019) and double-D quadrature pad (DDQP) (Chen et al., 2019) coils have good anti-misalignment in the transverse and longitudinal directions, but the magnetic induction intensity in the center of the coils is weak, making it difficult for the receiving coil to effectively couple to the magnetic field energy. 2. Based on the double-D quadrature (DDQ) structure coil that can eliminate the mutual inductance between coupling coils and cross-coupling, Gong et al. (2022a) proposed a parameter optimized LCC-LC series-parallel hybrid topology circuit, which ensures that the output current fluctuation is controlled within 5% only when the system is misaligned within the 50% range along the X direction, achieving constant current output with anti-misalignment. The magnetic coupling structure’s finite element simulation model is established to analyze the change in magnetic induction intensity and the system’s anti-misalignment characteristics when the coil offsets along the x and y axes. Finally, an experimental prototype is developed to verify the constant voltage output performance and anti-misalignment performance of the system, and the proposed anti-misalignment system is compared with the systems in existing literature, highlighting the advantages of this design.
Findings
The experimental results show that the system can achieve a constant voltage output of 48V under a time-varying load, and the output voltage fluctuates within ±5% of the set value within the range of ±60 mm lateral misalignment and ±72 mm longitudinal misalignment.
Originality/value
Based on the dual LCC-S WPT system, the mutual inductance between the same side coils is reduced by adding decoupling coils, and the anti-misalignment characteristics and output power of the system are improved in a certain range. It is aimed at improving the stability of the system output and transmission efficiency.
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Yu Qin, Jing Qin and Chengwei Liu
This study aims to examine the evolution of spatial–temporal patterns in China’s hotel industry from 1978 to 2018.
Abstract
Purpose
This study aims to examine the evolution of spatial–temporal patterns in China’s hotel industry from 1978 to 2018.
Design/methodology/approach
A database comprising over 140,000 hotels with more than 30 rooms was created. The exploratory spatial–temporal data analysis (ESTDA) method, based on space–time cube model, was used to explore and visualize the spatial–temporal pattern of hotels.
Findings
The Chinese hotel industry can be divided into two development stages, namely, a large hotel-dominant stage before 2000 and a small–medium-sized hotel-dominant stage after 2000. China’s prefecture-level cities were clustered into four tiers. The higher the tier, the earlier the city will initiate hotel development. The Chinese hotel industry has four continuous hotspots (the Yangtze River Delta, Pearl River Delta, Bohai Rim and Sichuan and Chongqing) and some temporary hotspots.
Research limitations/implications
This study lacks quantitative investigation, which could show the underlying mechanism of the evolution of the Chinese hotel industry.
Originality/value
This study is the first to investigate China’s hotel evolution over 40 years by applying big data and the ESTDA method. The systematic and evolutionary exploration will enable hotel researchers to understand the spatial–temporal nature of hotel distribution better. Introducing the ESTDA method into tourism and hotel research also provides an additional tool to researchers. Hotel investors and operators, city and tourism planners and market regulators can learn from the evolution of location patterns to make better where and when decisions.
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Lei Qi, Bing Liu and Kaixian Mao
In the background of the post-financial crisis era and the transition of China’s economic development, the frequent occurrence of workplace deviant behavior in the economic field…
Abstract
Purpose
In the background of the post-financial crisis era and the transition of China’s economic development, the frequent occurrence of workplace deviant behavior in the economic field, such as stealing and bribery, caused a huge impact on the enterprise. In recent years, the deviant behavior of employees has been increased noticeably. The purpose of this study is to explore the influence of paternalistic leadership on employee deviant behavior in workplace. To have a deep understanding of the relationship between paternalistic leadership and employee deviant behavior, the author’s design rule-oriented ethical climate and self-interest-oriented ethical climate as two mediators in this research model.
Design/methodology/approach
Based on social learning theory and stressor-emotion model, this study conducts an investigation of influence mechanism between paternalistic leadership and workplace deviant behavior. Time-lagged data was collected from 226 employees from six cities in China. To test the hypothesis that the authors developed in this paper, the authors use empirical models from the existing literature about paternalistic leadership on employee deviant behavior. They establish multiple linear regressions to test the hypotheses.
Findings
This study reveals the direct effect of authoritarian leadership on employee deviant behavior and the moderated roles of benevolent leadership and moral leadership, also analysis the mediated mechanism of self-interest-oriented ethical climate and rule-oriented ethical climate. The results show that the higher the degree of authority leaders show in the organization, the easier to stimulate workplace deviance of employee, self-interest-oriented ethical climate and rule-oriented ethical climate play mediated role between authoritarian leadership and workplace deviant behavior. The interaction of benevolent leadership and moral leadership with authoritarian leadership can weaken the self-interest-oriented ethical climate but has nothing to do with rule-oriented ethical climate.
Originality/value
This study has three main contributions to the previous literature. First, this study explores the relationship between authoritarian leadership and employee workplace deviance, which could enrich the research on these negative behaviors in the Chinese context. Second, this study unpacks the “black box” in which authoritarian leadership influences employee workplace deviant behavior. Third, this study further examines the impacts of different combinations of the three factors of paternalistic leadership.
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Gaoming Zhang, Yong Zhao and Jing Lei
Over the past few decades China's higher education has gone through dramatic growth and multiple rounds of reforms accompanied by a remarkable amount of financial investment, all…
Abstract
Purpose
Over the past few decades China's higher education has gone through dramatic growth and multiple rounds of reforms accompanied by a remarkable amount of financial investment, all aiming at developing world‐class universities to grow innovative talents. Yet the outcomes so far have been disappointing. This paper aims to investigate this issue.
Design/methodology/approach
By reviewing and analyzing selected educational reforms in higher education in China, this article discusses the reasons of the gap between the massive input for innovation in higher education in China and abysmal results. This paper also reports and analyzes a case that challenges central control and the gaokao system.
Findings
Central control and the gaokao, the infamous college entrance exam, are the bedrocks of China's higher education and also the culprit for China's failure to cultivate innovative talents. Unless they are fundamentally changed it is unlikely that China will have the higher education system it dreams of having.
Originality/value
This article provides an overview of China's efforts to cultivate innovative talents by strategically investing in building world‐class higher education institutions (HEIs) and analyzes the reasons behind the apparent gap between its massive input and the abysmal results achieved.