Peyman Taheri, Mahmood Aliofkhazraei, Changiz Dehghanian and Alireza Sabour Rouhaghdam
Plasma electrolytic saturation (PES) treatments were applied on the surface of AISI H13 steel and corrosion resistance of the treated samples was investigated using…
Abstract
Purpose
Plasma electrolytic saturation (PES) treatments were applied on the surface of AISI H13 steel and corrosion resistance of the treated samples was investigated using electrochemical test methods. The aim was to obtain optimal corrosion resistance of the differently treated samples.
Design/methodology/approach
Nitrocarburized and boride layers were produced on AISI H13 steel by the means of the PES technique. Different experimental parameters during each treatment provided different microstructural and electrochemical properties. The techniques used in the present investigation included X‐ray diffraction, SEM, potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS).
Findings
The plasma electrolytic nitrocarburising coating was characterized by lower integrity than a PEB coating. All PES coated steels had a noble electrochemical behavior compared to the untreated steel. Different nano‐structures and morphologies obtained by different experimental parameters produced different electrochemical behaviors.
Practical implications
The results obtained in this research into PES techniques can be used wherever good corrosion resistance with the highest efficiency is required.
Originality/value
The speed of treatment by plasma electrolytic saturation techniques makes this method very suitable for industrial production of components.
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Keywords
The purpose of this paper is to obtain an integrated method for inter-turn short circuit fault detection for the cage-rotor induction machine (CRIM) considering saturation effect…
Abstract
Purpose
The purpose of this paper is to obtain an integrated method for inter-turn short circuit fault detection for the cage-rotor induction machine (CRIM) considering saturation effect.
Design/methodology/approach
The magnetic equivalent circuit (MEC) is proposed for machine modeling and nonlinear B-H curve is considered for saturation effect. The machine has some differential equations which are converted to algebraic type by trapezoidal method. On the other hand, some nonlinear equations are present due to saturation effect. A set of nonlinear algebraic equation should be solved by numerical method. Therefore, the Newton-Raphson technique is used for equation solving during of the considered time step.
Findings
Generally, the operating point of electrical machines is close to the saturation zone due to designing considerations. Moreover, some current and torque harmonics will be produced due to time and space harmonics combination, which cannot be studied when saturation modeling is neglected. Considering both space and time harmonics, a method is proposed for inter-turn short circuit fault detection based on the stator current signatures and the machine performance is analyzed in healthy and faulty cases. In order to obtain the integrated method, two sample machines (two and also four-pole machines) are modeled and finally the accuracy of the proposed method is verified through the experimental results.
Research limitations/implications
The calculations have been done in this work is limited to CRIM considering. However, the presented modeling method can be used for another types of electrical machines by some minor modifications.
Originality/value
Obtaining of an integrated formula for the inter-turn short circuit fault detection which has been presented for first time is the more advantages of present work. Moreover, in order to saturation effect considering, a new method is presented for solving of nonlinear equations which is another novelty of paper.
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Peyman Akhavan, Majid Ramezan and Jafar Yazdi Moghaddam
Current successful and thriving organizations are those which create or gain new knowledge and convert it into applicable methods for improving their activities and performance…
Abstract
Purpose
Current successful and thriving organizations are those which create or gain new knowledge and convert it into applicable methods for improving their activities and performance. Nonetheless, ethics are the key issues in achieving such organizations and gaining success in implementation of supportive systems for aforementioned subjects. The main aim of the present study is therefore to examine the impact of ethical principles on knowledge management processes.
Design/methodology/approach
The present paper tries to study the impact of ethics on knowledge management process according to the model of Nonaka and Takeuchi. To measure this issue, a conceptual model is developed based on literature. In order to examine the validity of the model, employees in some areas of an industrial organization including computer, IT, electronic and mechanic were asked to answer the items in a questionnaire designed for the same research. Structural equation modeling is used to analyze research variables.
Findings
The results show that there is a positive and significant relationship between ethics and knowledge management process. Likewise, there is a direct and significant relationship between ethics and knowledge management processes such as socialization, externalization and combination while the relationship between ethics and internalization is not significant.
Research limitations/implications
Published resources are paramount about knowledge management while they suffer from a systematic regard as well as considering ethics in all knowledge management processes. Therefore, the main limitation of this research is the lack of studies in the field of relation of ethics and knowledge management (KM).
Originality/value
The results extend the understanding of the role of ethical principles in knowledge management processes. Hence, this research can open a new window in science space that is related to knowledge management and ethics.
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XinYing Chew, Raed Alharbi, Khai Wah Khaw and Alhamzah Alnoor
The study is interested in knowing “the role of the organizational structure as a mediating variable of the relationship between the information technology and organizational…
Abstract
Purpose
The study is interested in knowing “the role of the organizational structure as a mediating variable of the relationship between the information technology and organizational communication”.
Design/methodology/approach
The study was conducted in several service companies, and the study adopted the questionnaire as a basic tool for the data collection on the practical side, as 267 opinions were surveyed, in addition to conducting personal interviews, and the normal distribution of data was tested, analyzing, describing and diagnosing study variables, testing correlations and determining direct effects.
Findings
Findings show that there is no direct and significant statistical impact of information technology on organizational communications. Whereas there was a positive, direct and statistically significant impact of information technology on the organizational structure. There was also a positive, direct and statistically significant effect of the organizational structure on organizational communication.
Research limitations/implications
This paper is restricted to the role of the organizational structure as a mediating variable of the relationship between the influence of information technology on organizational communication.
Practical implications
As part of the practical implication, the paper suggests the need to increase support and attention to the importance of information technology in service organizations in order to increase coordination and organizational communication and achieve a high ability to explore and exploit ideas.
Originality/value
Apart from the fact that several companies were engaged, the organizational structures of these companies were engaged too to examine the impacts of Information technology (ICT) on organizational communication.
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Meiqi Lu and Maxwell Fordjour Antwi-Afari
Recent emerging information technologies like digital twin (DT) provide new concepts and transform information management processes in the architecture, engineering and…
Abstract
Purpose
Recent emerging information technologies like digital twin (DT) provide new concepts and transform information management processes in the architecture, engineering and construction (AEC) industry. Although numerous articles are pertinent to DT applications, existing research areas and potential future directions related to the state-of-the-art DT in project operation and maintenance (O&M) are yet to be studied. Therefore, this paper aims to review the state-of-the-art research on DT applications in project O&M.
Design/methodology/approach
The current review adopted four methodological steps, including literature search, literature selection, science mapping analysis and qualitative discussion to gain a deeper understanding of DT in project O&M. The impact and contribution of keywords and documents were examined from a total of 444 journal articles retrieved from the Scopus database.
Findings
Five mainstream research topics were identified, including (1) DT-based artificial intelligence technology for project O&M, (2) DT-enabled smart city and sustainability, (3) DT applications for project asset management, (4) Blockchain-integrated DT for project O&M and (5) DT for advanced project management. Subsequently, research gaps and future research directions were proposed.
Originality/value
This study intends to raise awareness of future research by summarizing the current DT development phases and their impact on DT implementation in project O&M among researchers and practitioners.