The purpose of this paper is to assess state-of-the-art techniques for quantifying flow distortion in the inlets of turbofan engines, particularly with respect to the prospects…
Abstract
Purpose
The purpose of this paper is to assess state-of-the-art techniques for quantifying flow distortion in the inlets of turbofan engines, particularly with respect to the prospects for future flight applications.
Design/methodology/approach
To adequately characterize the flow fields of complex aircraft inlet distortions, the author has incorporated laser velocimetry techniques, namely, stereoscopic particle image velocimetry (PIV) and Doppler velocimetry based on filtered Rayleigh scattering (FRS), into inlet distortion studies.
Findings
Overall, the results and experience indicate that the pathway for integration of FRS technologies into flight systems is clearer and more robust than that of PIV.
Practical implications
While always a concern, the topic of inlet distortion has grown in importance as contemporary airframe designers seek extremely compact and highly integrated inlets. This research offers a means for gaining new understanding of the in situ aerodynamic phenomena involved with complex inlet distortion.
Originality/value
This paper presents unique applications of turbofan inlet velocimetry methods while providing an original assessment of technological challenges involved with progressing advanced velocimetry techniques for flight measurements.
Details
Keywords
K. Todd Lowe, Raul Otero and Wing Ng
The purpose of this paper is to present an acoustics-based method for measuring turbofan nozzle exhaust thrust, while assessing the potential of scaling the methods for in-flight…
Abstract
Purpose
The purpose of this paper is to present an acoustics-based method for measuring turbofan nozzle exhaust thrust, while assessing the potential of scaling the methods for in-flight measurements.
Design/methodology/approach
Although many methods proposed for achieving in-flight thrust measurements involve complicated, sensitive and expense instruments, an acoustics-based approach is discussed that greatly simplifies the technology development pathway to in-flight applications.
Findings
Results are provided for a minimum set of sensors applied in the exhaust of a research turbofan engine at Virginia Tech, showing the difference in acoustics-measured thrust and nozzle thrust found by integrating thermocouple and Kiel probe measurements to be less than 6 per cent at the maximum fan speed examined.
Practical implications
Measuring accurate thrust values in flight will prove immediately valuable for installed thrust validation and engine health monitoring. Acoustics-based methodologies are attractive because of the robustness and low cost of sensors and sources. The value of in-flight thrust measurements, along with the benefits of acoustic approaches, makes the current topic of great interest for further development.
Originality/value
This paper presents unique applications of a time-of-flight acoustic thrust sensor, while providing an original assessment of technological challenges involved with the progression of the technique for in-flight measurements.
Details
Keywords
Sebastian J. Lowe, Lily George and Jennifer Deger
This chapter looks at what it means to set out to do anthropological research with tangata whenua (New Zealanders of Māori descent; literally, ‘people of the land’), from the…
Abstract
This chapter looks at what it means to set out to do anthropological research with tangata whenua (New Zealanders of Māori descent; literally, ‘people of the land’), from the particular perspective of a Pākehā (New Zealander of non-Māori descent – usually European) musical anthropologist with an interest in sound-made worlds. In late 2017, Lowe was awarded funding for a conjoint PhD scholarship in anthropology at James Cook University, Australia, and Aarhus University, Denmark. However, following advice from several colleagues in Aotearoa New Zealand, Lowe decided to assess the viability of the project with his prospective Māori and non-Māori collaborators prior to officially starting his PhD candidature. Throughout this process of pre-ethics (Barrett, 2016), Lowe met with both Māori and non-Māori to discuss the proposed PhD project; a ‘listening in’ to his own socio-historical positioning as a Pākehā anthropologist within contemporary Aotearoa New Zealand. This approach to anthropological research is in response to George (2017), who argues for a new politically and ethnically aware mode of anthropology that aims to (re)establish relationships of true meaning between anthropology and Māori in Aotearoa New Zealand.
Details
Keywords
Sara E. Green, Rosalyn Benjamin Darling and Loren Wilbers
This paper presents an updated summary of a meta-analysis of qualitative research on parenting children with disabilities published over the last 50 years. In this summary, we…
Abstract
Purpose
This paper presents an updated summary of a meta-analysis of qualitative research on parenting children with disabilities published over the last 50 years. In this summary, we explore whether shifts in academic discourse and changes in professional training are reflected in research on parenting and/or the experiences of parents who are the subject of such research. The detailed findings of the original analysis were published in Volume 7 of Research in Social Science and Disability.
Methodology/approach
An extensive literature search was conducted, and 79 peer-reviewed qualitative studies on the experience of parenting a child with a disability were included in the sample. Themes were extracted from the reviewed literature and compared across decades.
Findings
The findings of the present review suggest that some aspects of the parenting experience have changed very little. In particular, parents continue to experience negative reactions such as stress and anomie, especially early in their children’s lives, and socially imposed barriers such as unhelpful professionals and a lack of needed services continue to create problems and inspire an entrepreneurial response. In addition, stigmatizing encounters with others continue to be a common occurrence. In contrast to earlier decades, studies conducted in more recent years have begun to use the social model of disability as an analytic frame and also increasingly report that parents are questioning and challenging the concept of “normal” itself.
Originality/value
Additional improvements are needed in professional education and services to reduce the negative reactions experienced by parents of children with disabilities. The findings of this meta-analysis can serve as a guide to future research on parenting children with disabilities.
Details
Keywords
Tessa Withorn, Carolyn Caffrey, Joanna Messer Kimmitt, Jillian Eslami, Anthony Andora, Maggie Clarke, Nicole Patch, Karla Salinas Guajardo and Syann Lunsford
This paper aims to present recently published resources on library instruction and information literacy providing an introductory overview and a selected annotated bibliography of…
Abstract
Purpose
This paper aims to present recently published resources on library instruction and information literacy providing an introductory overview and a selected annotated bibliography of publications covering all library types.
Design/methodology/approach
This paper introduces and annotates English-language periodical articles, monographs, dissertations, reports and other materials on library instruction and information literacy published in 2018.
Findings
The paper provides a brief description of all 422 sources, and highlights sources that contain unique or significant scholarly contributions.
Originality/value
The information may be used by librarians and anyone interested as a quick reference to literature on library instruction and information literacy.
Details
Keywords
Sara E. Green, Rosalyn Benjamin Darling and Loren Wilbers
This chapter reviews qualitative research on parenting children with disabilities published over the last 50 years to explore whether shifts in academic discourse and changes in…
Abstract
Purpose
This chapter reviews qualitative research on parenting children with disabilities published over the last 50 years to explore whether shifts in academic discourse and changes in professional training have affected research on parenting and/or the experiences of parents who are the subject of such research.
Methodology/approach
An extensive literature search was conducted, and 78 peer-reviewed, qualitative studies on the experience of parenting a child with a disability were included in the sample. Themes were extracted from the reviewed literature and compared across decades.
Findings
The findings of the present review suggest that some aspects of the parenting experience have changed very little. In particular, parents continue to experience negative reactions such as stress and anomie, especially early in their children’s lives, and socially imposed barriers such as unhelpful professionals, and a lack of needed services continue to create problems and inspire an entrepreneurial response. In addition, stigmatizing encounters with others continue to be a common occurrence. In contrast to earlier decades, studies conducted in more recent years have begun to use the social model of disability as an analytic frame and also increasingly report that parents are questioning and challenging the concept of “normal” itself.
Social/practical implications
Additional improvements are needed in professional education and services to reduce the negative reactions experienced by parents of children with disabilities.
Originality/value of chapter
The findings of this meta-analysis can serve as a guide to future research on parenting children with disabilities.
Details
Keywords
Claudia M. Van der Heijde and Beatrice I. J. M. Van der Heijden
The purpose of this chapter is to draw attention to employability being an important social innovation that potentially thrives with transformational leadership, partly depending…
Abstract
Purpose
The purpose of this chapter is to draw attention to employability being an important social innovation that potentially thrives with transformational leadership, partly depending on certain personal characteristics such as managerial role and personality.
Methodology/Approach
The study was carried out among pairs of employees (314) and immediate supervisors (334) working at a large Dutch company that produces building materials. We made use of Linear Regression and Structural Equation Modeling to test our hypothesis and explore our assumptions with regard to the research model.
Findings
We have found that transformational leadership is positively related to employee and supervisor ratings of employability. Furthermore, there is some indication that transformational leadership enhances employability in some situations, demonstrating differences between categories of workers with and without a managerial function. Moreover, it appeared that after controlling for personality, only the positive relationship between transformational leadership and supervisor ratings of employability, remained for the workers not having a managerial function.
Research Limitations/Implications
Our study design comprised a cross-sectional approach and therefore future longitudinal research is necessary to investigate causal relationships between transformational leadership, personality, and employability.
Practical Implications
In terms of individual career development practices, our outcomes should be translated into increased attention for aligning leadership style to meet the requirements of all types of employees across the life-span.
Social Implications
By providing more insight into the increased importance of transformational leadership for certain groups of workers, this contribution is intended to come up with opportunities for increasing the employability for different types of workers.
Originality/Value
This chapter draws attention to the fact that transformational leadership can be a useful tool for stimulating employability of workers. Worker characteristics such as personality, work role (e.g., managerial role) and other life-span factors always have to be taken into account for a customized approach, given the uniqueness of each and every employee.