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1 – 10 of 335Xiaonan Chen, Shiyong Chu, Guanglin Zhang, Xuanyou Chen, Jun Huang and Mingxu Yi
General aviation aircraft has a wide range of applications, and effective cost management is one of the hot spots in the research of general aviation manufacturers. The purpose of…
Abstract
Purpose
General aviation aircraft has a wide range of applications, and effective cost management is one of the hot spots in the research of general aviation manufacturers. The purpose of this paper is to build a flexible engineering method to predict maintenance cost of general aviation aircraft.
Design/methodology/approach
To establish a reasonable general aviation aircraft maintenance cost prediction model, it is necessary to analyze the influencing factors and extract the main components of maintenance cost. The maintenance cost is divided by engineering method, and the estimation model of each component cost is established. Then, the general aviation aircraft maintenance cost model is obtained. The results show that the relative error of this method is between 13% and 20%, which has a good estimation accuracy and can be effectively used to estimate the maintenance cost of general aviation aircraft.
Findings
The maintenance cost plays an important role in the life cycle cost of general aviation aircraft. Accurate cost prediction method is of great significance to the optimal design of general aviation aircraft. However, there are few prediction models suitable for maintenance cost, the proposed approach is meaningful and quite desirable.
Originality/value
To some extent, this method overcomes the shortage of the work on maintenance cost prediction for general aviation aircraft. The model established in this paper has certain generality, which can provide some reference for general aviation aircraft design and operation enterprises.
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Miroslav Šplíchal, Miroslav Červenka and Jaroslav Juracka
This study aims to focus on verifying the possibility of monitoring the condition of a turboprop engine using data recorded by on-board avionics Garmin G1000. This approach has…
Abstract
Purpose
This study aims to focus on verifying the possibility of monitoring the condition of a turboprop engine using data recorded by on-board avionics Garmin G1000. This approach has potential benefits for operators without the need to invest in specialised equipment. The main focus was on the inter-turbine temperature (ITT). An unexpected increase in temperature above the usual value may indicate an issue with the engine. The problem lies in the detection of small deviations when the absolute value of the ITT is affected by several external variables.
Design/methodology/approach
The ITT is monitored by engine sensors and stored by avionics 1× per second onto an SD card. This process generates large amount of data that needs to be processed. Therefore, an algorithm was created to detect the steady states of the engine parameters. The ITT value also depends on the flight parameters and surrounding environment. As a solution to these effects, the division of data into clusters that represent the usual flight profiles was tested. This ensures a comparison at comparable ambient pressures. The dominant environmental influence then remain at the ambient air temperature (OAT). Three OAT compensation methods were tested in this study. Compensation for the standard atmosphere, compensation for the standard temperature of the given flight level and compensation for the speed of the generator, where the regression analysis proved the dependence between the ambient temperature and the speed of the generator.
Findings
The influence of ambient temperature on the corrected ITT values is noticeable. The best method for correcting the OAT appears to be the use of compensation through the revolutions of the compressor turbine NG. The speed of the generator depends on several parameters, and can refine the corrected ITT value. During the long-term follow-up, the ITT differences (delta values) were within the expected range. The tested data did not include the behaviour of the engine with a malfunction or other damage that would clearly verify this approach. Therefore, the engine monitoring will continue.
Practical implications
This study presents a possible approach to turbine engine condition monitoring using limited on board avionic data. These findings can support the development of an engine condition monitoring system with automatic abnormality detection and low operating costs.
Originality/value
This article represent a practical description of problems in monitoring the condition of a turboprop engine in an aircraft with variable flight profiles. The authors are not aware of a similar method that uses monitoring of engine parameters at defined flight levels. Described findings should limit the influence of ambient air pressure on engine parameters.
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Essam Mansour, Ahmed Shehata and Abdelrahman Farrag
The purpose of this study is to explore the information-seeking behavior of Egyptian physicians serving in COVID-19 isolation hospitals.
Abstract
Purpose
The purpose of this study is to explore the information-seeking behavior of Egyptian physicians serving in COVID-19 isolation hospitals.
Design/methodology/approach
A sample of 91 physicians serving in Egyptian isolation hospitals answered the study questionnaire.
Findings
Demographically, more than half of respondents were males. Over one-third of them are holding Doctor of Medicine (M.D), followed by one-third holding Master of Medicine (MMed). Respondents' age ranged from 30 to 60 years. Internal medicine is the most common specialty, accounting for nearly half of all physicians, followed by chest medicine and intensive care medicine. The information-seeking behavior of these three groups in their regular work is believed to be different, but since all of the participants are working in COVID-19 isolation hospitals, they should have the same information resources, Internet access and the same needs relevant to COVID-19 in order to make accurate clinical decisions. The physicians used traditional and electronic information sources to fulfill their information needs, the most important of which were to make a specific research, find an answer to a specific case, and deliver a medical lecture. Colleagues, coworkers, nurses and pharmacists were the most important channels pursued by Egyptian physicians to obtain information.
Originality/value
This study is the first study that focuses on investigating the information-seeking behavior of Egyptian physicians serving in isolation hospitals. Any findings resulted from this study may serve as a noteworthy reference that may be useful to the Egyptian health sector, experts, researchers, as well as policymakers in establishing strategic decisions for making the understating much better.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/OIR-08-2020-0350
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William C. Curran and Matt C. Danbrook
Child welfare services (CWSs) globally continue to absorb high rates of children living with or suspected of fetal alcohol spectrum disorder (FASD). Such high prevalence rates…
Abstract
Purpose
Child welfare services (CWSs) globally continue to absorb high rates of children living with or suspected of fetal alcohol spectrum disorder (FASD). Such high prevalence rates render CWS with major ethical and moral dilemmas of meeting complex needs. Currently, many jurisdictions are challenged by diagnostic capacity and cost implications of formal FASD diagnosis. This paper aims to recommend a screening protocol to address management gap between FASD initial presentation and formal diagnosis.
Design/methodology/approach
This is a follow-up paper from a grounded-theory study of a sample (N = 18) of child welfare social workers (CWSWs), allied health professionals and foster parents. A stepwise protocol was developed through systematical interpretation of the final data.
Findings
The application of a five-step screening protocol would greatly support CWSW in meeting the needs of children with suspected FASD. This CWSWs-led assessment model incorporates a clinical evaluation to exclude neurodevelopmental conditions caused by known genetic disorders, followed by behavioral and neurocognitive psychosocial assessments.
Research limitations/implications
This study had several limitations. Firstly, as a specific social work-based sample, it is not necessarily representative of the wider population of social workers globally due to different cultural responses to FASD in CWSs. The transferability of findings will have to be considered due to cultural variations concerning FASD.
Practical implications
By offering a management and nonlabeling approach, this five-step screening protocol offers a delineated pathway for CWSW and addresses the major professional frustrations while seeking to plan safe care for a child suspected of having FASD.
Social implications
The research offers a pragmatic low-cost to society to alleviate the mounting social and monetary implications of FASD. A large percentage of children impacted by prenatal alcohol exposure do not qualify under formal clinical diagnostic guidelines. Leaving these children without intervention is problematic. The recommendation of this study addresses this critical gap in services. The primary aim is to alleviate the burden on this cohort of vulnerable children by offering nonlabeling neurodevelopmental screening.
Originality/value
The direct implications of FASD and how it impacts CWS are well documented. However, few studies focus on the critical interface of FASD and the role of CWSW responsible for planning their safe care. This paper offers a novel pragmatic and functional multistep protocol to aid CWSW in this complex area of practice.
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Robert Wapshott and Oliver Mallett
This chapter argues for the unrealised potential value of methodologies derived from a critical realist research philosophy in the field of entrepreneurship studies. Critical…
Abstract
This chapter argues for the unrealised potential value of methodologies derived from a critical realist research philosophy in the field of entrepreneurship studies. Critical realism offers methodological alternatives that, through the generation of new insights into social relations, social structures and key generative mechanisms, can offer significant value for entrepreneurship researchers. Reflecting on their personal experiences researching from a critical realist perspective in entrepreneurship studies, the authors explore how this research philosophy can extend the field of inquiry and promote new perspectives. The chapter explores this in relation to the specific topic of enterprise policy and demystifies some aspects of critical realism by setting out some of its basic principles to demonstrate their potential to develop new insights. Further, this approach can create significant impact, for example, through the development of effective interventions. The chapter concludes by identifying implications for enterprise policy development, implementation and evaluation.
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Thalia Anthony, Juanita Sherwood, Harry Blagg and Kieran Tranter
Angela M. Kaufman-Parks, Monica A. Longmore, Wendy D. Manning and Peggy C. Giordano
The majority of emerging adults in the United States spend time in cohabiting unions. Prior research has suggested that higher levels of sexual non-exclusivity may exist among…
Abstract
The majority of emerging adults in the United States spend time in cohabiting unions. Prior research has suggested that higher levels of sexual non-exclusivity may exist among those in cohabiting relationships compared to marital unions. Although these basic patterns have been explored in prior work, research examining the potential reasons why levels of sexual non-exclusivity differ by union status has been limited. Drawing on a relational perspective and using the fifth wave of data from the Toledo Adolescent Relationships Study (TARS), the present study found that higher levels of sexual non-exclusivity in cohabiting relationships were explained by intimate relationship characteristics and sexual histories rather than sociodemographic factors, partner heterogamy, or partner- and couple-level drug use. These findings highlighted that understanding the higher rates of sexually non-exclusive experiences in cohabiting relationships, compared to marital relationships, requires attention to specific dynamics of the intimate partnership and prior relational experiences of both partners. The study concluded that cohabitation has a unique place in emerging adults’ relationship landscape and may set the groundwork for future relationship functioning.
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Shima Yazdani and Esmail Lakzian
Currently, waste is regarded as a symptom of inefficiency. The generation of waste is a human activity, not a natural one. Currently, landfilling and incinerating wastes are…
Abstract
Currently, waste is regarded as a symptom of inefficiency. The generation of waste is a human activity, not a natural one. Currently, landfilling and incinerating wastes are common waste management techniques; but the use of these methods, in addition to wasting raw materials, causes damage to the environment, water, soil, and air. In the new concept of “Zero Waste” (ZW), waste is considered a valuable resource. A vital component of the methodology includes creating and managing items and procedures that limit the waste volume and toxicity and preserve and recover all resources rather than burning or burying them. With ZW, the end of one product becomes the beginning of another, unlike a linear system where waste is generated from product consumption. A scientific treatment technique, resource recovery, and reverse logistics may enable the waste from one product to become raw material for another, regardless of whether it is municipal, industrial, agricultural, biomedical, construction, or demolition. This chapter discusses the concept of zero landfills and zero waste and related initiatives and ideas; it also looks at potential obstacles to put the ZW concept into reality. Several methods are presented to investigate and evaluate efficient resource utilization for maximum recycling efficiency, economic improvement through resource minimization, and mandatory refuse collection. One of the most practical and used approaches is the Life Cycle Assessment (LCA) approach, which is based on green engineering and the cradle-to-cradle principle; the LCA technique is used in most current research, allowing for a complete investigation of possible environmental repercussions. This approach considers the entire life cycle of a product, including the origin of raw materials, manufacturing, transportation, usage, and final disposal, or recycling. Using a life cycle perspective, all stakeholders (product designers, service providers, political and legislative agencies, and consumers) may make environmentally sound and long-term decisions.
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