The traditional maintenance scheduling strategies of multi-component systems may result in maintenance shortage or overage, while system degradation information is often ignored…
Abstract
Purpose
The traditional maintenance scheduling strategies of multi-component systems may result in maintenance shortage or overage, while system degradation information is often ignored. The purpose of this paper is to propose a multi-phase model that better integrates degradation information, dependencies and maintenance at the tactical level.
Design/methodology/approach
This paper proposes first a maintenance optimization model for multi-component systems with economic dependence and structural dependence. The cost of combining maintenance activities is lower than that of performing maintenance on components separately, and the downtime cost can be reduced by considering structural dependence. Degradation information and multiple maintenance actions within scheduling horizon are considered. Moreover, the maintenance resources can be integrated into the optimization model. Then, the optimization model adopting one maintenance activity is extended to multi-phase optimization model of the whole system lifetime by taking into account the cost and the expected number of downtime.
Findings
The superiority of the proposed method compared with periodic maintenance is demonstrated. Thus, the values of both integrated degradation information and considering dependencies are testified. The advantage of the proposed method is highlighted in the cases of high system utilization, long maintenance durations and low maintenance costs.
Originality/value
Few studies have been carried out to integrate decisions on degradation, dependencies and maintenance. Their considerations are either incomplete or not realistic enough. A more comprehensive and realistic multi-phase model is proposed in this paper, along with an iterative solution algorithm for it.
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Drawing on conservation of resources theory, this study explores the relationships of decent work (DW) with in-role performance (IRP) and organizational citizenship behavior…
Abstract
Purpose
Drawing on conservation of resources theory, this study explores the relationships of decent work (DW) with in-role performance (IRP) and organizational citizenship behavior toward the organization (OCBO) by focusing on the mediating role of career satisfaction (CS) and the moderating role of supervisor ostracism (SO).
Design/methodology/approach
Hypotheses were tested using latent moderated structural equations method with two-wave data from 376 employees in a South China industrial park.
Findings
DW is positively associated both directly and indirectly, via the mediation of CS, with IRP and OCBO; the positive relationship between DW and CS is negatively moderated by SO.
Practical implications
The findings show that employee performance can be improved by implementing discernible DW activities that foster CS, but that this effect can be weakened by SO. It is, therefore, critical to create a DW environment for employees and lessen the incidence of SO in the organization.
Originality/value
This research enriches the literature by addressing the previously unexplored relationship between DW and employee performance by focusing on the mediating role of CS and the moderating role of SO.
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Jixin Han, Haibang Zhang, Juncai Sun, Wenyuan Zhao and Jinlong Cui
The purpose of this study is to improve the surface electrical conductivity and corrosion resistance of AISI430 stainless steel (430 SS) as bipolar plates for direct formic acid…
Abstract
Purpose
The purpose of this study is to improve the surface electrical conductivity and corrosion resistance of AISI430 stainless steel (430 SS) as bipolar plates for direct formic acid fuel cell (DFAFC).
Design/methodology/approach
The niobium diffusion layers have been successfully synthesized on 430 SS substrate by the plasma surface diffusion alloying technique under different diffusion alloying time.
Findings
The surface morphology of Nb-modified 430 SS prepared under the diffusion alloying time of 2 h is more homogeneous, relatively sleek and compact without surface micropore and other common surface blemishes. The potentiostatic and potentiodynamic polarization measurements manifest that Nb-modified 430 SS prepared under the diffusion alloying time of 2 h enormously ameliorate the corrosion resistance of bare 430 SS compared with other Nb-modified 430 SS samples and its corrosion current density is maintained at −1.4 µA cm−2 in simulated anodic environment of DFAFC (0.05 M H2SO4 + 2 ppm HF + 10 M formic acid at 50 °C).
Originality/value
The effect of diffusion alloying time on the corrosion resistance and surface conductivity of Nb-modified 430 SS has been carefully studied. The Nb-modified 430 SS samples prepared at the diffusion alloying time of 2 h have the best surface electrical conductivity and corrosion resistance in the simulated anodic environment of DFAFC.