title: An Investigation into Landing Approach Visual Illusions

authors: Reynolds, Natalie Beth

subjects: aviation

abstract: This experiment was designed to examine aspects of human visual perception during approaches to a runway. The runway width illusion has commonly been reported to contribute to the dangerous tendency of pilots to fly low approaches to runways that are wide and high approaches to runways that are narrow. Attempts to prevent the runway width illusion have not attempted to identify the ideal location for an indicator of altitude. Thus the present experiment examined the effect of varying runway width and manipulated scenes in order to determine whether the runway width illusion was present and where participants were focusing their attention in the scenes. Thirty-two non-pilot participants and 3 pilots took part in the experiment and viewed static and dynamic scenes of runways that were narrow (30.48m), medium (60.96m) or wide (91.44m) at one of three viewing heights low (30.48m), medium (45.72m) or high (60.96m). After viewing scenes, participants were required to estimate their altitude and aim-point. The results of this experiment revealed that participants were fairly inaccurate at estimating altitude and were inclined to overestimate aim-point, however the data also indicated that there was a robust runway width illusion that was present across static and dynamic trials and in both altitude and aim-point data. The standard marking on the runway in an attempt to prevent the runway width illusion was not effective at preventing incorrect altitude estimations but did assist participants to estimate aim-point. It was also found that the objects that participants' most commonly reported using to estimate altitude in the visual scene were located in the lower segment of the scenes.

text: An Investigation into Landing Approach Visual Illusions This experiment was designed to examine aspects of human visual perception during approaches to a runway. The runway width illusion has commonly been reported to contribute to the dangerous tendency of pilots to fly low approaches to runways that are wide and high approaches to runways that are narrow. Attempts to prevent the runway width illusion have not attempted to identify the ideal location for an indicator of altitude. Thus the present experiment examined the effect of varying runway width and manipulated scenes in order to determine whether the runway width illusion was present and where participants were focusing their attention in the scenes. Thirty-two non-pilot participants and 3 pilots took part in the experiment and viewed static and dynamic scenes of runways that were narrow (30.48m), medium (60.96m) or wide (91.44m) at one of three viewing heights low (30.48m), medium (45.72m) or high (60.96m). After viewing scenes, participants were required to estimate their altitude and aim-point. The results of this experiment revealed that participants were fairly inaccurate at estimating altitude and were inclined to overestimate aim-point, however the data also indicated that there was a robust runway width illusion that was present across static and dynamic trials and in both altitude and aim-point data. The standard marking on the runway in an attempt to prevent the runway width illusion was not effective at preventing incorrect altitude estimations but did assist participants to estimate aim-point. It was also found that the objects that participants' most commonly reported using to estimate altitude in the visual scene were located in the lower segment of the scenes.

year: 2007

title: Predicting chitosan particle size produced by electrohydrodynamic atomization

authors: Hu, Jung-Feng

subjects: chitosan

abstract: The effect of processing variables on the size of chitosan nanoparticles produced by electrohydrodynamic atomization was investigated. The size was strongly affected by process variables such as surface tension, conductivity and flow rate of chitosan solution, applied voltage and distance between the electrodes. A simple scaling law to quantitatively correlate the droplet size and process variables was developed by dimensional analysis and used to predict the diameter of particles produced under a given set of conditions. The model predictions agreed reasonably well with the experimental results.

text: Predicting chitosan particle size produced by electrohydrodynamic atomization The effect of processing variables on the size of chitosan nanoparticles produced by electrohydrodynamic atomization was investigated. The size was strongly affected by process variables such as surface tension, conductivity and flow rate of chitosan solution, applied voltage and distance between the electrodes. A simple scaling law to quantitatively correlate the droplet size and process variables was developed by dimensional analysis and used to predict the diameter of particles produced under a given set of conditions. The model predictions agreed reasonably well with the experimental results.

year: 2012

title: New Zealand history is Maori history: Tikanga as the ethical foundation of historical scholarship In Aotearoa New Zealand

authors: Mahuika, Nepia

subjects: Arts & Humanities

abstract: IT SHOULD COME AS NO SURPRISE TO FIND that New Zealand history is Māori history. In 1987 when Tipene O’Regan stated that the ‘the past belongs to all New Zealanders, but first it is ours’, he was drawing attention to New Zealand history’s foundation in Māori history.1 Thinking about New Zealand history as Māori history does not mean denying the histories of European, Asian and Pasifika immigrants, but draws attention to the notion that ‘settler’ aspirations to claim ‘Aotearoa’ as home occur within a much broader narrative of indigenous occupation and struggle.2 Indeed, how can New Zealand history be the story of ‘here’ when it has ‘othered’ indigenous narratives that speak to the heart of what it is to belong in the land of the long white cloud? Yes, New Zealand history is Māori history – and that presents a problem for tangata whenua self-determination. Likewise, for Pākehā, it is an issue because until New Zealand history recognizes and enables the centrality of Māori history it will always fail to articulate the collective ‘us’ that is so often assumed in the discourse of ‘full and final settlement’.3 In its current form it will never be able to ethically or adequately account for the shaping of a New Zealand identity that finds ‘composure’ in the story of how Pākehā became ‘native’ New Zealanders.4 For Māori, these issues are keenly felt, because while New Zealand history has always been about us, it has predominantly been articulated on the colonizers’ terms. In the ‘discursive constructions’ that are New Zealand histories, the indigenous have regularly been culturally appropriated, dislocated and misrepresented.5 Even when Māori have turned their back on the writing of New Zealand history it has been, and will still be, a history of being or becoming ‘native’. Yes, New Zealand history is Māori history – so why does it feel like the story of Pākehā settlers?

text: New Zealand history is Maori history: Tikanga as the ethical foundation of historical scholarship In Aotearoa New Zealand IT SHOULD COME AS NO SURPRISE TO FIND that New Zealand history is Māori history. In 1987 when Tipene O’Regan stated that the ‘the past belongs to all New Zealanders, but first it is ours’, he was drawing attention to New Zealand history’s foundation in Māori history.1 Thinking about New Zealand history as Māori history does not mean denying the histories of European, Asian and Pasifika immigrants, but draws attention to the notion that ‘settler’ aspirations to claim ‘Aotearoa’ as home occur within a much broader narrative of indigenous occupation and struggle.2 Indeed, how can New Zealand history be the story of ‘here’ when it has ‘othered’ indigenous narratives that speak to the heart of what it is to belong in the land of the long white cloud? Yes, New Zealand history is Māori history – and that presents a problem for tangata whenua self-determination. Likewise, for Pākehā, it is an issue because until New Zealand history recognizes and enables the centrality of Māori history it will always fail to articulate the collective ‘us’ that is so often assumed in the discourse of ‘full and final settlement’.3 In its current form it will never be able to ethically or adequately account for the shaping of a New Zealand identity that finds ‘composure’ in the story of how Pākehā became ‘native’ New Zealanders.4 For Māori, these issues are keenly felt, because while New Zealand history has always been about us, it has predominantly been articulated on the colonizers’ terms. In the ‘discursive constructions’ that are New Zealand histories, the indigenous have regularly been culturally appropriated, dislocated and misrepresented.5 Even when Māori have turned their back on the writing of New Zealand history it has been, and will still be, a history of being or becoming ‘native’. Yes, New Zealand history is Māori history – so why does it feel like the story of Pākehā settlers?

year: 2015