Catrin Pedder Jones, Annemarie Lodder and Chris Papadopoulos
Previous research has found that international students can experience poor mental health, low levels of life satisfaction, self-esteem and high levels of loneliness when studying…
Abstract
Purpose
Previous research has found that international students can experience poor mental health, low levels of life satisfaction, self-esteem and high levels of loneliness when studying in a foreign country. No study has directly compared these between international and home students studying in the UK. The paper aims to discuss these issues.
Design/methodology/approach
A total of 247 students completed an online survey at the University of Bedfordshire.
Findings
The hypothesis that international students experience higher loneliness, lower self-esteem, lower life satisfaction and poorer general mental health than home students was rejected. Home students had significantly lower self-esteem, life satisfaction and general mental health scores. Black ethnicity and home student status significantly predicted general mental health and self-esteem in regression analyses. The predictive utility of home student status was maintained when other variables were controlled for in regression models.
Originality/value
This research suggests that the UK universities should ensure that both home and international students are adequately supported for their mental health.
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Athanasios C. Chasalevris and Chris A. Papadopoulos
The purpose of this paper is to present a method for early crack detection in rotating shafts. A rotor-bearing system, consisting of an elastic rotor mounted on fluid film…
Abstract
Purpose
The purpose of this paper is to present a method for early crack detection in rotating shafts. A rotor-bearing system, consisting of an elastic rotor mounted on fluid film bearings, is used to detect the presence of the crack at a depth of around 5 percent of shaft radius. The fluid film bearings, the shaft and the crack introduce coupled bending vibrations both in the horizontal and vertical plane. Experimental time series of the rotor composite response under normal steady-state operation are uncoupled, to develop a signal processing procedure able to reveal the presence of the crack.
Design/methodology/approach
The variation of the coupling property that a crack (breathing or not) or a cut (always open) introduces into the system and the localization of the coupling in the time domain is a concept proposed as a means to detect transverse surface cracks in rotating shafts. This consideration is combined with the concept of external excitation for the development of an additional crack-sensitive response during system normal operation. Using an external excitation of an active magnetic bearing of specific duration, frequency and amplitude, the method uses this coupling variation during rotation.
Findings
The method is simple, quick and effective for early crack detection, being able to detect cracks as shallow as 5 percent of the shaft radius while the system is under normal operation, and can even be applied real-time. Experimental verification uses a simple elastic rotor with a cut mounted on fluid film bearings, with the cut producing similar coupling phenomena as an opened crack. Experimental results are encouraging.
Originality/value
The method used is simple, quick and effective for early crack detection, being able to detect cracks as shallow as 5 percent of the shaft radius while the system is under normal operation, and can even be applied real-time.
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Michael G. Papanikolaou, Michael G. Farmakopoulos and Chris A. Papadopoulos
Wear in journal bearings occurs when the operating conditions (high load, high temperature, low angular velocity or low viscosity), downgrade the ability of the bearing to carry…
Abstract
Purpose
Wear in journal bearings occurs when the operating conditions (high load, high temperature, low angular velocity or low viscosity), downgrade the ability of the bearing to carry load. The wear depth increases because the rotor comes in contact with the bearing surface. Wear in journal bearings affects their characteristics because of its influence on the thickness of the fluid film. This influence can be detected in the dynamic behavior of the rotor and especially in the dynamic stiffness and damping coefficients. The paper aims to discuss these issues.
Design/methodology/approach
In this paper, the effect of wear on the rotor dynamic stiffness and damping coefficients (K and C) of a short journal bearing is investigated. K and C in this work are estimated by using two methods a semi-analytical method and finite element (FE) analysis implemented in the ANSYS software.
Findings
The main goal of this research is to make the identification of wear in journal bearings feasible by observing the alternation of their dynamic coefficients. Both of the methods implemented are proven to be useful, while FE analysis can provide more accurate results.
Originality/value
This paper is original and has not been published elsewhere.
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Mary Henderson and Richard Majors
This chapter explores the importance of early autism spectrum disorder (ASD) assessment and diagnosis to facilitate early treatment. This chapter will have a particular focus on…
Abstract
This chapter explores the importance of early autism spectrum disorder (ASD) assessment and diagnosis to facilitate early treatment. This chapter will have a particular focus on ASD assessment and diagnosis within a Black and Minority Ethnic (BME) context. We propose using a Cultural Competence framework to process, analyze, assessment, and diagnosis results/findings. BME assessments/diagnoses can be delayed by up to 18 months longer when compared to Whites.
ASD Assessment aims to assess certain developmental traits in individuals to identify ASD which is a developmental disability. Autism is a spectrum condition which can manifest differently in each diagnosed individual. There are core features necessary for an ASD diagnosis to be made. These include among other traits: poor eye contact, abnormality in body language: for example, gestures, difficulties with social communication and social interaction, often they exhibit repetitive patterns of behavior, have obsessional interests, rigid thinking patterns, and have an aversion to certain sounds and textures and an unusual interest in sensory satisfaction.
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Yuhang Zhang, Chang Liu, Tingting Xu, Yan Huang and Liangyan Tao
The technical level of aircraft failure analysis plays a special role in ensuring the safety of civil aviation flight. Using appropriate methods for functional failures analysis…
Abstract
Purpose
The technical level of aircraft failure analysis plays a special role in ensuring the safety of civil aviation flight. Using appropriate methods for functional failures analysis can provide a reliable reference for aircraft safety. The purpose of this paper is to provide a new and comprehensive measure based on conventional functional hazard analysis (FHA) and grey system theory to analysis and evaluate the class that each failure belongs to.
Design/methodology/approach
This paper integrates multiple methods including the FHA, the fixed weight cluster, the Delphi method and the analytic hierarchy process (AHP). To begin with, use FHA method to sort out the corresponding failure states of a certain system from the perspective of function and determine the evaluation index. And then using group decision and AHP, determine the expert weight and index weight in the fixed weight cluster. The fixed weight cluster function is used to determine the grey class to which a certain functional failure belongs in the complex system.
Findings
In the past, the risk assessment of aircraft was mostly dominated by the subjective judgment of the experts, but it was not possible to give an objective observation score for each failure state. This paper addresses the problem efficiently as well as the feature of “little data, poor information.” The risk degree of each failure state can ultimately be replaced by a quantitative value.
Research limitations/implications
This paper uses the idea of clustering in grey system theory to evaluate the risk of landing gear system. In the expert evaluation stage, different experts evaluated the impact degree of the aircraft's failure caused by its functions, so the final risk classification is subjective to some extent.
Practical implications
This study analyzed the different conditions of the landing gear, including the front wheel steering, front wheel damping, front wheel steering system, brake system fault information and so on. It can effectively divide the different failure states and their effects, which is helpful to improve the safety of aircraft landing gear system and provide some useful methods and ideas for studying the safety of aircraft systems.
Social implications
Based on the FHA analysis process and the grey system theory, this paper determines various potential risks and their consequences of various functions according to the hierarchy, so as to carry out further detailed analysis on the risks that may occur under various functional conditions and take certain measures to prevent them. It is helpful to improve the risk management and control ability of aircraft in the actual flight process and to guarantee the safety of people's lives and property.
Originality/value
This paper is a pioneer in integrating the FHA method and the grey system theory, which exactly can be used to address the problem with the character of “little data, poor information.” The model established in this paper for the defects of FHA can effectively improve the accuracy of FHA, which is of great significance for the study of safety. In this paper, a case about landing gear system is given to illustrate the effectiveness of the model.
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R. J. Hamer Ltd. announce that Mr. Keith Stoodley has been appointed to the post of technical director.
Alan Beazley, Chris Ball and Kate Vernon
Ageing demographics are impacting employers around the world and, for many organisations, there are strong business reasons to develop strategies for managing the age profiles of…
Abstract
Ageing demographics are impacting employers around the world and, for many organisations, there are strong business reasons to develop strategies for managing the age profiles of their workplaces. Societal ageing is not necessarily bad news for business: older workers can be a valuable resource for employers in terms of skills, in-house knowledge and flexibility. Further, as populations age, businesses are delivering goods and services to an ageing market, and older workers can be a valuable resource. While ageing demographics can provide opportunities for the business community, there are significant challenges facing employers. For example, balancing the career interests and expectations of older and younger workers will necessitate new approaches to workforce planning, performance management and team building. As skilled workers become more scarce, employers need to also find ways to make better use of the talents and capabilities of older unemployed people. This chapter is written by representatives of employer networks in Europe and Asia. We discuss innovative approaches to age diversity of organisations on both continents. These include approaches to phased retirement, lifelong learning, flexible retirement and mentoring. In the final section, we suggest a research agenda which will generate practical knowledge for businesses which want to better manage workplace ageing. A business-focused research agenda includes improving the understanding of generations in the East and West, the intersection of age and other forms of diversity, lifelong learning, joblessness and providing the business case for businesses of different forms.
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Sadrudin A. Ahmed, Alain d’Astous and Christian Champagne
This article presents the results of a survey of 202 male Taiwanese consumers. In this study, consumer judgements of two technological products varying in their level of…
Abstract
This article presents the results of a survey of 202 male Taiwanese consumers. In this study, consumer judgements of two technological products varying in their level of complexity made in highly, moderately, and newly industrialised countries were obtained in a multi‐attribute context. The results show that the country‐of‐origin image of moderately and newly industrialised countries was less negative for technologically simpler products (i.e. a television) than they were for technologically complex products (i.e. a computer). It appears that the negative image of moderately and newly industrialised countries can be attenuated by making Taiwanese consumers more familiar with products made in these countries and/or by providing them with other product‐related information such as brand name and warranty. Newly industrialised countries were perceived more negatively as countries of design than as countries of assembly, especially in the context of making technologically complex products. The image of foreign countries as producers of consumer goods was positively correlated with education. The more familiar consumers were with the products of a country, the more favourable was their evaluation of that country. Consumer involvement with purchasing a technologically complex product such as a computer was positively associated with the appreciation of products made in moderately industrialised countries. Managerial and research implications are derived from these results.
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Thalia Anthony, Juanita Sherwood, Harry Blagg and Kieran Tranter