Yun Su, Hui Wang, Guangju Liu, Yunyi Wang, Jianlin Liu and Miao Tian
The paper aims to reveal the relationship among energy efficiency, thermal comfort and thermal regulation of electrically heated footwear and to investigate influencing factors on…
Abstract
Purpose
The paper aims to reveal the relationship among energy efficiency, thermal comfort and thermal regulation of electrically heated footwear and to investigate influencing factors on the energy efficiency and thermal comfort.
Design/methodology/approach
A finite volume model was proposed to simulate the two-dimensional heat transfer in electrically heated footwear (EHF) under an extremely cold condition. The model domain consists of three-layer footwear materials, a heating pad, a sock material, an air gap and skin tissues. Model predictions were verified by experimental data from cold-contact exposure. Then the influencing factors on the energy efficiency and thermal comfort were investigated through parametric analysis.
Findings
The paper demonstrated that the skin temperature control (STC) mode provided superior thermal comfort compared to the heating pad temperature control (HPTC) mode. However, the energy efficiency for the HPTC mode with a heating temperature of 38 °C was 18% higher than the STC mode. The energy efficiency of EHF while reaching the state of thermal comfort was strongly determined by the arrangement and connection of heating elements, heating temperature, thickness and thermal conductivity of footwear materials.
Originality/value
The findings obtained in this paper can be used to engineer the EHF that provides optimal thermal comfort and energy efficiency in cold environments.
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Enhui Yan, Jianlin Wu and Jibao Gu
The purpose of this paper is to investigate how complementors’ marketing capability and technology capability affect their performance. Drawing on social capital theory, the…
Abstract
Purpose
The purpose of this paper is to investigate how complementors’ marketing capability and technology capability affect their performance. Drawing on social capital theory, the authors examine platform network centrality as a mediator and platform reputation as a moderator of the relationships between these two capabilities and complementor performance.
Design/methodology/approach
This study collects data by questionnaire from 154 Chinese firms adopting e-commerce platforms. Hierarchical multiple regression is used to test the hypotheses of this study.
Findings
This study finds that complementors’ marketing capability and technology capability positively affect performance by increasing their platform network centrality. Moreover, platform reputation positively moderates the relationship between platform network centrality and complementor performance, and it strengthens the mediating role of platform network centrality.
Originality/value
This paper emphasizes the critical role of marketing capability and technology capability on complementor performance. It explores the improvement path of complementor performance from the perspective of network position, which is a key element for complementors to effectively leverage their capabilities to build competitive advantage.
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Lixin Sheng, Jianlin Wu and Jibao Gu
Drawing from the resource-based view (RBV), this study aims to develop a parsimonious model in the context of digital platforms that links strategic network resources (SNR) and…
Abstract
Purpose
Drawing from the resource-based view (RBV), this study aims to develop a parsimonious model in the context of digital platforms that links strategic network resources (SNR) and firm performance through considering dynamic capabilities (DC) as important mediating mechanisms. In addition, we also investigate how platform monitoring shapes the relationship between SNR and DC.
Design/methodology/approach
This study uses the survey data from 162 firms in eastern China.
Findings
The findings indicate that both two DC dimensions (i.e., sensing and reconfiguring) significantly mediate the relationship of SNR-performance. Moreover, platform monitoring positively moderates the relationship of SNR and sensing as well as SNR and reconfiguring.
Originality/value
With these findings, this study advances SNR and digital platform research and provides insights into how to transform SNR into superior performance through DC.
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Jibao Gu, Jun Song and Jianlin Wu
The purpose of this paper is to examine how abusive supervision affects employee creativity, incorporating departmental identification as a mediator and face as a moderator based…
Abstract
Purpose
The purpose of this paper is to examine how abusive supervision affects employee creativity, incorporating departmental identification as a mediator and face as a moderator based on social identity theory.
Design/methodology/approach
The study sample consisted of 207 full-time employees in China.
Findings
Results indicate that abusive supervision is negatively related to employee creativity and this relationship is fully mediated by departmental identification. In addition, face held by employees plays a moderating role: the direct effect of abusive supervision on departmental identification and the mediating effect of departmental identification are stronger when face is low rather than high.
Practical implications
This study also has major practical implications for organizations. First, the organizations should fully understand the harmfulness of abusive supervision and try to avoid abusive behaviors. Second, the organizations could enhance employee creativity by promoting departmental identification. Third, employees who hold low face should get more attention and support.
Originality/value
This study makes several theoretical implications. First, findings contribute to enriching one’s understanding of the relationship between abusive supervision and employee creativity in China. Second, the domain of abusive supervision is expanded by empirically testing departmental identification as a crucial psychological mechanism explaining the abusive supervision – employee creativity relationship. Third, this study also advances one’s understanding of social identity process by examining empirically moderating effects of cultural value in the relationship between abusive supervision and employee creativity.
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Sang Xiong, Jia Si, Jianlin Sun, Hao Wu, Hongchen Dong and Chao Zhang
Corrosion inhibitors for copper immersed in emulsion were investigated by experiments and theoretical calculations, and this study aims to propose a new inhibition mechanism of…
Abstract
Purpose
Corrosion inhibitors for copper immersed in emulsion were investigated by experiments and theoretical calculations, and this study aims to propose a new inhibition mechanism of the inhibitors having protective effects for copper corrosion.
Design/methodology/approach
Adsorption behavior of penta-heterocycles (thiophene, 1,2,5-oxadiazole, furan, 2 H-1,2,3-triazole, pyrrole and 1,2,5-thiadiazole) as corrosion inhibitors for copper immersed in oil-in-water (O/W) emulsions was investigated by weight loss, electrochemical tests, morphological characterization and theoretical calculations.
Findings
The orders of inhibition effect are furan < pyrrole < thiophene < 1,2,5-oxadiazole < 2H-1,2,3-triazole < 1,2,5-thiadiazole, and 1,2,5-thiadiazole at 0.5 mM has the best inhibition effect for copper immersed in emulsion. The results of scanning probe microscope, scanning electron microscope and electrochemical test show that a protective barrier can be formed on the surface of copper substrate with six corrosion inhibitors, thus effectively inhibiting the corrosion of copper mainly through chemisorption and following Langmuir’s adsorption isotherm.
Originality/value
Quantum chemical and molecular dynamic simulations demonstrate that all these compounds attached to Cu matrix with a flat-adsorption mode to prevent the emulsion corrode copper. Adsorbed inhibitors act as a barrier at Cu matrix to block corrosion and improve hydrophobicity.
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Lei Cao, Jianlin Cai, Cheng Wang, Tianyou Yang, Wei Zhou and Liwu Wang
The purpose of this study is to describe and observe the influence of boundary slip associated with an arbitrary entrainment angle on the contact lubrication properties of…
Abstract
Purpose
The purpose of this study is to describe and observe the influence of boundary slip associated with an arbitrary entrainment angle on the contact lubrication properties of ellipses.
Design/methodology/approach
Based on the modified Reynolds equation, the boundary slip of any angle is considered in the elliptic contact, and numerical simulation is carried out. In the above calculation, the progressive mesh densification method is used, which greatly reduces the computation time.
Findings
The results indicate that the variation of film thickness corresponding to different entrainment angles is distinct from those without considering boundary slip. In addition, boundary slip reduces the central film thickness and minimum film thickness, which makes the hydrodynamic pressure distribution smoother.
Originality/value
The present study focuses on the specific condition with the arbitrary direction of rolling and sliding velocity found in hypoid gears and worm, and some other components. The influence of boundary slip associated with arbitrary entrainment angle on the lubrication film thickness in elliptical contacts is first revealed, which improves a good understanding of elastohydrodynamic lubrication characteristics.
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Xiaoping Lin, Xiaoyan Li, Jiming Yao, Xianghong Li and Jianlin Xu
To develop electrode materials for supercapacitor with superior electrochemical performance and simple preparation process, the purpose of this study is to prepare flexible…
Abstract
Purpose
To develop electrode materials for supercapacitor with superior electrochemical performance and simple preparation process, the purpose of this study is to prepare flexible CC/NiS/a-NiS electrodes with self-supporting structure by loading hydrothermally synthesized a-NiS particles along with nano-NiS on carbon cloth by electroplating method.
Design/methodology/approach
The effects of current densities, temperatures and pH values on the loading amount and uniformity of the active substances during the plating process were investigated on the basis of optimization of surface morphology, crystalline structure and electrochemical evaluation as the cyclic voltammetry curves, constant current charge–discharge curves and AC impedance.
Findings
The a-NiS particles on CC/NiS/a-NiS were mostly covered by the plated nano-NiS, which behaved as a bulge and provided a larger specific surface area. The CC/NiS/a-NiS electrode prepared with the optimized parameter exhibited a specific capacitance of 115.13 F/g at a current density of 1 A/g and a Coulomb efficiency of 84% at 5 A/g, which is superior to that of CC/NiS electrode prepared by electroplating at a current density of 10 mA/cm2, a temperature of 55°C and a pH of 4, demonstrating its fast charge response of the electrode and potential application in wearable electronics.
Originality/value
This study provides an integrated solution for the development of specifically structured NiS-based electrode for supercapacitor with simple process, low cost and high electrochemical charge/discharge performance, and the simple and easy-to-use method is also applicable to other electrochemically active composites.
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Jun Song, Jianlin Wu and Jibao Gu
The purpose of this paper is to test the moderating role of work-related stressors on the relationship between voice behavior and the voicer’s creative performance.
Abstract
Purpose
The purpose of this paper is to test the moderating role of work-related stressors on the relationship between voice behavior and the voicer’s creative performance.
Design/methodology/approach
The sample comprised 781 full-time employees from 16 companies covering six industries in the central region of China. Hierarchical moderated regression analyses were used to test the hypotheses.
Findings
Results showed that voice behavior had significant positive effect on creative performance. The positive relationship between voice behavior and creative performance was stronger for employees with low challenge stressors as well as for employees with high hindrance stressors.
Research limitations/implications
This study employs a cross-sectional design with data collected from the same source.
Practical implications
The findings suggest that employees should be encouraged to voice out their opinions and ideas. Work-related stressors should be treated differently to expand the effects of voice behavior on creative performance.
Originality/value
This study is one of the few to establish boundary conditions from the contextual perspective on the effect of voice behavior on employee performance. Considering whether work-related stressor is a challenge or a hindrance could possibly result in a better understanding of the role of work-related stressors in the voice behavior-creative performance relationship. An empirical evidence is provided for the positive relationship between voice behavior and employee performance outcomes.
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Juan Guo, Yanfeng Han, Shouan Chen, Jianlin Cai and Haiming Dai
This paper aims to identify the role of the wall slip on the dynamic characteristics of the multi-groove water-lubricated bearing considering rough contact, including stiffness…
Abstract
Purpose
This paper aims to identify the role of the wall slip on the dynamic characteristics of the multi-groove water-lubricated bearing considering rough contact, including stiffness and damping coefficients of the water film and contact stiffness coefficient of the asperity contact.
Design/methodology/approach
The modified perturbed average Reynolds equations with the wall slip are derived, and the calculated perturbed hydrodynamic pressures are integrated to obtain the stiffness and damping coefficients of the water film. The elastic-plastic contact model of Kogut and Etsion is used to determine the contact stiffness coefficient.
Findings
Numerical results reveal that the wall slip has the more significant impact on the water film stiffness coefficients compared with the damping and contact stiffness coefficients. When the slip angle lies in a reasonable range, the lubrication performance can be effectively improved, especially in the mixed lubrication condition. In addition, it is worth emphasizing that the abrupt change of the water film stiffness coefficients occurs at the region II (pressure zone) in this study.
Originality/value
The influence mechanism of the wall slip on the dynamic characteristics of the water-lubricated bearing considering rough contact is first revealed.
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Chang Dong, Jianlin Sun, Zixuan Cheng and Yuqing Hou
The purpose of this paper is to synthesize a microemulsion and investigate its tribological properties as lubricant. Magnesium alloy warm rolling experiments were conducted…
Abstract
Purpose
The purpose of this paper is to synthesize a microemulsion and investigate its tribological properties as lubricant. Magnesium alloy warm rolling experiments were conducted. Surface morphology was observed and wear form was summarized. The composition of surface residues was analyzed, which sheds light on the lubrication mechanism of microemulsion.
Design/methodology/approach
A microemulsion was prepared with a proper amount of oil, surfactant, cosurfactant, water and other additives for magnesium alloy strip warm rolling. Tribological properties, such as maximum non-seizure load (PB), friction coefficient (μ) and wear scar diameter (D) of the microemulsion were measured and compared with those of emulsion and rolling oil on an MR-10A four-ball tribotester. The extreme pressure anti-wear coefficients (O) were calculated and compared. Warm rolling experiments were carried out on a Ф 170/400 × 300 mm four-high rolling mill at 240°C to compare the finish rolling thickness and surface quality of rolled AZ31B magnesium alloy strip under four lubrication states, namely, no lubrication, rolling oil, microemulsion and emulsion. The surface morphology after warm rolling was observed with confocal laser scanning microscope and scanning electron microscope, respectively. The composition of surface residues was analyzed with energy dispersive spectrometry and X-Ray photoelectron spectroscopy.
Findings
Surface morphology indicated that pitting wear, adhesive wear and ploughing wear were three main forms of wear in magnesium alloy warm rolling. Microemulsion had excellent lubrication properties with less residual oil remaining. Two types of adsorption layers formed on magnesium alloy strip surface were responsible for lubrication properties. MgSO4 and magnesium stearate in the reaction layer played a key role in anti-wear and friction-reduction in warm rolling.
Originality/value
The study is original and gives valuable information on lubrication mechanism of microemulsion in warm rolling of magnesium alloy strips.