The effects of water movement on the corrosion of non‐ferrous metals isreviewed in the light of the recent literature and of experimental workin progress at the Admiralty…
Abstract
The effects of water movement on the corrosion of non‐ferrous metals isreviewed in the light of the recent literature and of experimental workin progress at the Admiralty Materials Laboratory.
PROGRAMME AT OLYMPIA. Arrangements to ensure a varied and interesting programme during the four days of the Conosion and Metal Finishing Exhibition at Olympia, London, from…
Abstract
PROGRAMME AT OLYMPIA. Arrangements to ensure a varied and interesting programme during the four days of the Conosion and Metal Finishing Exhibition at Olympia, London, from November 29 to December 2 have been completed. Apart from the obvious attraction of the stands which are representative of all that is being done in the struggle against corrosion, there are to be two symposia, one organised by the Corrosion Group of the Society of Chemical Industry and the other by the Plastics Institute, and also film shows during each morning and afternoon of the exhibition except for the opening morning and when the symposia are in progress.
Ali Karevan, Kong Fah Tee and Mohammadreza Vasili
This study presents a reliability-based and sustainability-informed maintenance optimization model for telecommunications equipment. It considers several risk attributes…
Abstract
Purpose
This study presents a reliability-based and sustainability-informed maintenance optimization model for telecommunications equipment. It considers several risk attributes associated with sustainability dimensions (i.e. social, economic and environmental aspects).
Design/methodology/approach
Many companies have developed long-term strategies to promote higher resource utilization, which has led to a paradigm shift in the role of maintenance. In parallel, reliability has been recognized as a fundamental factor in characterizing the optimal blend of maintenance strategies for a given system. It is essential for accurate failure prediction, which contributes toward more efficient use of all resources.
Findings
The corresponding subattributes are identified based on expert opinions and then incorporated into the proposed model. Subsequently, using the multiobjective particle swarm optimization (MOPSO), the proposed sustainability risks together with the maintenance costs are optimized, and the proper blend of maintenance strategies is identified.
Originality/value
Effective management of all human and natural resources, which are particularly emphasized by the concept of sustainability, has attracted much attention in recent years. However, contributions that effectively apply this concept in maintenance problems are very few and very few studies have attempted to quantify sustainability.
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Phillips, J. has drawn the distinction between wrongful dismissal at common law and unfair dismissal under statute. He points out the considerable difference which exists between…
Abstract
Phillips, J. has drawn the distinction between wrongful dismissal at common law and unfair dismissal under statute. He points out the considerable difference which exists between the position at common law and the position under statute. “The common law” he says “is concerned merely with the contractual relationship between the parties, whereas a complaint of unfair dismissal…is concerned with the statutory right of an employee not to be unfairly dismissed.” There thus exists a fundamental difference between the two concepts, both of which are in their different circumstances important. In this monograph, it is proposed to treat the common law of wrongful dismissal. Statutory unfair dismissal will be the subject of discussion in a future monograph.
Arash Arianpoor and Mahsa Toorchi
The present study aims to investigate the impact of manager conservatism on innovation and capital expenditures especially the moderating role of the crisis caused by the COVID-19…
Abstract
Purpose
The present study aims to investigate the impact of manager conservatism on innovation and capital expenditures especially the moderating role of the crisis caused by the COVID-19 outbreak for companies listed on the Tehran Stock Exchange (TSE).
Design/methodology/approach
The present study investigated information about 178 companies in 2014–2022. In this study, the CEO’s signature was a psychological proxy of conservatism. Modified multiple regression analysis was used to investigate the moderating role of COVID-19. The present study also used the Generalized Method of Moments (GMM) to address endogeneity issues.
Findings
The results showed that manager conservatism has a positive and significant effect on capital expenditures, while manager conservatism negatively impacts firm innovation. In addition, COVID-19 significantly strengthens the impact of manager conservatism on capital expenditures and firm innovation. Hypothesis testing based on robustness checks confirmed these results.
Originality/value
This study aims to investigate the impact of manager conservatism, as a personality trait, on capital expenditures and innovation. These aspects have not been thoroughly explored in the existing literature. Additionally, it is important to consider the perceived threat of COVID-19, known to have a greater effect on conservatives. This study seeks to examine the interactive role of manager conservatism and COVID-19 on investment in capital expenditures and innovation. The present findings will not only benefit managers and policymakers in both developing and developed countries but will also provide valuable insights into decision-making processes related to capital expenditures and innovation during critical conditions such as the COVID-19 outbreak.
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Rana Jafarpisheh, Mehdi Karbasian and Milad Asadpour
The purpose of this study is to propose a hybrid reliability-centered maintenance (RCM) approach for mining transportation machines of a limestone complex, a real case in Esfahan…
Abstract
Purpose
The purpose of this study is to propose a hybrid reliability-centered maintenance (RCM) approach for mining transportation machines of a limestone complex, a real case in Esfahan, Iran.
Design/methodology/approach
Criteria for selecting critical machines were collected within literature and selected by decision-makers (DCs), and critical machines have been identified using the preference ranking organization method for enrichment of evaluations (PROMETHEE). Also, multi-criteria decision-making (MCDM) methods were used in addition to failure mode, effects and criticality analysis (FMECA) for selecting and prioritizing high-risk failures as well as optimizing the RCM performance. More specifically, the criteria of severity, detectability and frequency of occurrence were selected for risk assessment based on the previous studies, and were weighted using the analytic hierarchy process (AHP) method. Also, the technique for order of preference by similarity to ideal solution (TOPSIS) has been applied to prioritize failures' risk. Finally, the critical failures were inserted in the RCM decision-making worksheet and the required actions were determined for them.
Findings
According to the obtained values from PROMEHTEE method, the machine with code 739-7 was selected as the first priority and the most critical equipment. Further, based on results of TOPSIS method, the failure mode of “Lubrication hole clogging in crankpin bearing due poor quality oil,” “Deformation of main bearing due to overwork” and “The piston ring hotness due to unusual increase in the temperature of cylinder” have the highest risks among failure modes, respectively.
Originality/value
RCM has been deployed in various studies. However, in the current study, a hybrid MCDM-FMECA has been proposed to cope with high-risk failures. Besides, transportation machineries are one of the most critical equipment in the mining industry. Due to noticeable costs of this equipment, effective and continuous usage of this fleet requires the implementation of proper maintenance strategy. To the best of our knowledge, there is no research which has used RCM for transportation systems in the mining sector, and therefore, the innovation of this research is employment of the proposed hybrid approach for transportation machineries in the mining industry.
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In 2011, the World Bank announced its intention to conduct a holistic review and reform of its procurement framework. This reform was intended to ensure that its procurement…
Abstract
In 2011, the World Bank announced its intention to conduct a holistic review and reform of its procurement framework. This reform was intended to ensure that its procurement system, which is the means through which the Bank disburses developmental loans and grants is in line with modern trends in procurement, is flexible enough to respond to unforeseen challenges and is coherent. This paper examines both how Bank procurement has evolved since the first formal regulations were issued in 1964 and the implications of the recent reforms for the Bank and its borrowers. Readers will see that ongoing reforms evidence a significant change for the Bank's approach to procurement and its relationship with its borrowers and will dramatically affect the way the Bank-funded procurements are conducted.
Isobel Claire Gormley and Thomas Brendan Murphy
Ranked preference data arise when a set of judges rank, in order of their preference, a set of objects. Such data arise in preferential voting systems and market research surveys…
Abstract
Ranked preference data arise when a set of judges rank, in order of their preference, a set of objects. Such data arise in preferential voting systems and market research surveys. Covariate data associated with the judges are also often recorded. Such covariate data should be used in conjunction with preference data when drawing inferences about judges.
To cluster a population of judges, the population is modeled as a collection of homogeneous groups. The Plackett-Luce model for ranked data is employed to model a judge's ranked preferences within a group. A mixture of Plackett- Luce models is employed to model the population of judges, where each component in the mixture represents a group of judges.
Mixture of experts models provide a framework in which covariates are included in mixture models. Covariates are included through the mixing proportions and the component density parameters. A mixture of experts model for ranked preference data is developed by combining a mixture of experts model and a mixture of Plackett-Luce models. Particular attention is given to the manner in which covariates enter the model. The mixing proportions and group specific parameters are potentially dependent on covariates. Model selection procedures are employed to choose optimal models.
Model parameters are estimated via the ‘EMM algorithm’, a hybrid of the expectation–maximization and the minorization–maximization algorithms. Examples are provided through a menu survey and through Irish election data. Results indicate mixture modeling using covariates is insightful when examining a population of judges who express preferences.
Denise Chapman and Evan Ortlieb
This chapter explores how preservice teachers can use videos via social media to organize their ideas and enhance their understanding of content and pedagogical practices. It…
Abstract
Purpose
This chapter explores how preservice teachers can use videos via social media to organize their ideas and enhance their understanding of content and pedagogical practices. It exemplifies how teacher development programs must embrace and become more in tune with societal practices and norms.
Methodology/approach
The methods of data collection for this study consist of participant observation of in-class activities (descriptive field notes reconstructing dialogue and activities), an open-ended questionnaire, and a focus group interview.
Findings
Five primary themes were revealed that describe preservice teachers’ scholarly experiences using Pinterest: igniting digital serendipity, Pinterest critic in relation to their thinking, Organizing and nesting knowledge, Picky pinning researcher, and Expert distributor of knowledge.
Practical implications
Teacher educators should consider how participants demonstrated a sense of pride in their scholarly creations and some began displaying modest amounts of expertise and characteristics of leadership within their local community both online and in-person.
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This article surveys the literature dealing with theory and applications of life cycle costing (LCC). It deals with the literature published in the last 25 years and provides 667…
Abstract
This article surveys the literature dealing with theory and applications of life cycle costing (LCC). It deals with the literature published in the last 25 years and provides 667 references.