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- Bengtsson, Samuel N., et al.
(författare)
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Free induction decay in the extreme ultraviolet
- 2015
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Ingår i: Proceedings of Frontiers in Optics 2015, FIO 2015. - 9781943580033
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Konferensbidrag (refereegranskat)abstract
- We present an experimental study of controlled Free Induction Decay (FID) in the extreme ultraviolet regime excited by High-order Harmonics. The control is done by applying a delayed infrared pulse.
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- Buckley, Jeffrey, 1992-, et al.
(författare)
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A comparison of swedish and Irish secondary students conceptions of engineers and engineering using the draw-an-engineer test
- 2019
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Ingår i: ASEE Annual Conference and Exposition, Conference Proceedings. - : American Society for Engineering Education.
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Konferensbidrag (refereegranskat)abstract
- Women are significantly underrepresented in engineering and engineering related disciplines. One area where this is clearly illustrated is in the percentage of females enrolled in higher education engineering courses. The 2016 data on enrolment by field from the Organization for Economic Co-operation and Development (OECD) shows that the maximum percentage of female enrolment in “engineering and engineering trades” education at Bachelors, Masters, and Doctoral level in OECD countries is 28.33% in Sweden. As this form of education is likely to lead to a career in an engineering related field, there is a clear need to understand the factors which influence female students' decisions to enroll in higher education engineering courses. There are many influences on students' choices to pursue specific career paths. For example, how students conceive a particular discipline or career will influence this decision, as what they believe it to involve will likely affect their interest in engaging with it. In engineering, students often have misconceptions regarding what it means to be an engineer and the Draw-an-Engineer Test (DAET) has frequently been used to investigate these misconceptions. Studies using DAET have found that young students typically conceive engineers to be male, with the majority of male students typically representing engineers as male, but, with female students drawing more frequent but still relatively small proportions of female engineers. However, at least with the original “Draw a” instrument, the Draw-a-Scientist Test (DAST), children's drawings of scientists have been found to be becoming more gender diverse over time. In this study, the DAET is used in a comparative study between Sweden and Ireland. These countries were selected as according to the 2016 OECD data on higher education enrolment, Sweden has the highest representation of female engagement with engineering in higher level education (28.33%), while Ireland has one of the lowest (14.13%). The study cohort (ntotal = 513; nIreland = 302; nSweden = 211) in the context of both countries includes students who are approximately 15 years old. This age is of cultural significance in both countries as students are at a juncture in second level education where they must make a choice on what they will study at upper secondary level, which will consequently have an impact on their decision on what to study should they choose to progress to higher level education. Results are presented in relation to participants engineering stereotypes in terms of gender and the nature of engineering activities, and also in terms of their level of interest in engineering. Importantly, the results indicate that in order to understanding engineering stereotypes and young people's interest in becoming an engineer, the complex relationship between a student's gender, cultural context, and conception of engineering must be considered.
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- Doyle, Andrew, 1992-, et al.
(författare)
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Theorising the role of engineering education for society : Technological activity in context?
- 2019
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Ingår i: ASEE Annual Conference and Exposition, Conference Proceedings. - : American Society for Engineering Education.
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Konferensbidrag (refereegranskat)abstract
- This paper establishes a theoretical position from which to analyse and reason about the difficulties associated with closing the gap between the provision of engineering education in universities and the needs of society. Broadly speaking, the disparity between societal expectations and university graduate profiles highlights that despite achieving success in university; recently graduated engineers are often under-prepared for their initial years in the workplace. Continuing reports of this disparity suggest that current efforts have not succeeded in sufficiently closing this gap. As an antecedent to reforming engineering education policy or advocating a new pedagogical approach, we first theorise the role of engineering education for society. In adopting lessons from the philosophy of technology and how this has influenced the discourse surrounding K-12 technology education, the relationship between technological activity and technological knowledge is considered as a vessel though which to articulate engineering education. Through situating engineering disciplines as different contexts for technology, the need for engineering students to develop an ontological position towards engineering as technological activity, emerges as important. In this view, we hold that a fluid epistemological boundary for engineering disciplines necessitates perspectives on how to enact engineering, as doing engineering in authentic contexts is advocated to support the well-established practices around learning about discipline specific declarative knowledge. The foregrounding of an understanding of engineering as technological activity, founded on (but not limited to) well-established discipline specific knowledge is framed as an 'ontology-based curriculum'. We conclude the paper with a discussion of some of the prevailing challenges to operationalising this conception of engineering education for society.
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- Hoff, D., et al.
(författare)
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Quantum Beat Spectroscopy of Helium Photoelectrons
- 2023
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Ingår i: 2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023. - 9798350345995
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Konferensbidrag (refereegranskat)abstract
- The availability of broadband extreme ultraviolet light sources allows for investigation of electron wave-packets from high lying bound states in atoms [1,2]. The dynamics of these states can be mapped out in the ionization continuum with an overlapping infrared field, which may also uncover new, light induced, dressed states [3]. Here, we carry out a complete characterization of these electron wave-packets using a small number of attosecond pulses.
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- Nguyen, Sang N., et al.
(författare)
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Methodology for predicting the threat of runway debris impact to large transport aircraft
- 2012
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Konferensbidrag (refereegranskat)abstract
- Large transport aircraft are particularly susceptible to impact damage from runway debris thrown up by the landing gear. A methodology was developed to predict the trajectories of stones lofted by the nose wheel and subjected to aerodynamics forces due to the wake behind the nose landing gear and beneath the aircraft. In conjunction with finite element modeling of the stone/ground/tire contact mechanics, a Matlab model was used to perform a stochastic prediction of the trajectories of runway stones to generate impact threat maps which showed the relative likelihood of stones impinging upon various areas on the underside of a C-130 Hercules. The impact envelopes for the C-130 extended 2.4 to 17.5 meters behind the nose wheel and two meters either side of the center of the aircraft. The impact threat maps were especially sensitive to the values of the coefficients of lift and drag acting on the stone during its flight.
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