ORCID Profile
0000-0003-3722-027X
Current Organisation
University of Southern Queensland
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Aerospace Engineering | Hypersonic Propulsion and Hypersonic Aerodynamics |
Publisher: Springer Science and Business Media LLC
Date: 14-12-2013
Publisher: Elsevier BV
Date: 2020
Publisher: Edward Elgar Publishing
Date: 14-07-2023
Publisher: IOP Publishing
Date: 26-07-2017
Publisher: Springer Science and Business Media LLC
Date: 11-12-2017
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 11-2021
DOI: 10.2514/1.A35062
Publisher: Wiley
Date: 02-2021
DOI: 10.1111/MAPS.13622
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 10-2016
DOI: 10.2514/1.T4820
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 04-2017
DOI: 10.2514/1.T4787
Publisher: IOP Publishing
Date: 03-2019
Publisher: Springer Science and Business Media LLC
Date: 12-11-2017
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 2015
DOI: 10.2514/1.T4309
Publisher: Wiley
Date: 17-08-2020
DOI: 10.1111/ISJ.12305
Publisher: EDP Sciences
Date: 05-2018
DOI: 10.1051/0004-6361/201732225
Abstract: Context. Determining the source regions of meteorites is one of the major goals of current research in planetary science. Whereas asteroid observations are currently unable to pinpoint the source regions of most meteorite classes, observations of meteors with camera networks and the subsequent recovery of the meteorite may help make progress on this question. The main caveat of such an approach, however, is that the recovery rate of meteorite falls is low ( %), implying that the meteoritic analogues of at least 80% of the observed falls remain unknown. Aims. Spectroscopic observations of incoming bolides may have the potential to mitigate this problem by classifying the incoming meteoritic material. Methods. To probe the use of spectroscopy to determine the meteoritic analogues of incoming bolides, we collected emission spectra in the visible range (320–880 nm) of five meteorite types (H, L, LL, CM, and eucrite) acquired in atmospheric entry-like conditions in a plasma wind tunnel at the Institute of Space Systems (IRS) at the University of Stuttgart (Germany). A detailed spectral analysis including a systematic line identification and mass ratio determinations (Mg/Fe, Na/Fe) was subsequently performed on all spectra. Results. It appears that spectroscopy, via a simple line identification, allows us to distinguish the three main meteorite classes (chondrites, achondrites and irons) but it does not have the potential to distinguish for ex le an H chondrite from a CM chondrite. Conclusions. The source location within the main belt of the different meteorite classes (H, L, LL, CM, CI, etc.) should continue to be investigated via fireball observation networks. Spectroscopy of incoming bolides only marginally helps precisely classify the incoming material (iron meteorites only). To reach a statistically significant s le of recovered meteorites along with accurate orbits ( ) within a reasonable time frame (10–20 years), the optimal solution may be the spatial extension of existing fireball observation networks.
Publisher: Springer Science and Business Media LLC
Date: 22-06-2020
Publisher: Springer Science and Business Media LLC
Date: 11-2021
DOI: 10.1007/S12567-021-00396-Y
Abstract: This article presents the full operational experimental capabilities of the plasma wind tunnel facilities at the Institute of Space Systems at the University of Stuttgart. The simulation of the aerothermodynamic environment experienced by vehicles entering the atmosphere of Earth is attempted using three different facilities. Utilizing the three different facilities, the recent improvements enable a unique range of flow conditions in relation to other known facilities. Recent performance optimisations are highlighted in this article. Based on the experimental conditions demonstrated a corresponding flight scenario is derived using a ground-to-flight extrapolation approach based on local mass-specific enthalpy, total pressure and boundary layer edge velocity gradient. This shows that the three facilities cover the challenging parts of the aerothermodynamics along the entry trajectory from Low Earth Orbit. Furthermore, the more challenging conditions arising during interplanetary return at altitudes above 70 km are as well covered.
Publisher: American Astronomical Society
Date: 08-03-2017
Publisher: American Institute of Aeronautics and Astronautics
Date: 13-06-2014
DOI: 10.2514/6.2014-2250
Publisher: Edward Elgar Publishing
Date: 14-07-2023
Publisher: Elsevier BV
Date: 11-2020
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 02-2013
DOI: 10.2514/1.J051867
Publisher: AIP Publishing
Date: 03-2021
DOI: 10.1063/5.0040801
Abstract: This article describes a novel high frame rate emission spectroscopy setup developed for measurements in high enthalpy flow fields. The optical setup and the associated hardware arrangements are described in detail followed by test case data to demonstrate the capability of recording spectral images at 1 kHz frame rate. The new system is based on a classical Czerny–Turner spectrograph but with a particular setup for high frame rate detection using a Generation II intensifier coupled with a high-speed camera. The high frame rate spectral images acquired enable, for the first time, investigation of the spatial distribution and temporal tracking and evolution of molten droplets of an ablating s le. In this paper, an ex le is shown from ablating meteorite s les tested in a high enthalpy plasma flow field corresponding to a flight scenario at an altitude of 80 km. This new instrumental configuration allows emission spectroscopic analysis of transient phenomena simulated in the high enthalpy ground test facilities with kHz resolution. The particular feature of this system is the ability to measure very faint spectral lines at high temporal and spatial resolution.
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 07-2016
DOI: 10.2514/1.T4695
Publisher: American Institute of Aeronautics and Astronautics (AIAA)
Date: 03-2021
DOI: 10.2514/1.J059590
Publisher: Elsevier BV
Date: 11-2017
Publisher: Oxford University Press (OUP)
Date: 2019
Abstract: In a changing climate, southern hemisphere mammals are predicted to face rising temperatures and aridity, resulting in food and water shortages, which may further challenge already constrained energetic demands. Especially semelparous mammals may be threatened because survival of the entire population depends on the success of a single breeding event. One of these species, the yellow-footed antechinus, Antechinus flavipes, a small, heterothermic marsupial mammal, commences reproduction during winter, when insect prey is limited and energetic constraints are high. We examined the inter-relations between thermal and foraging biology of free-ranging A. flavipes and examined whether they use torpor for energy conservation, despite the fact that reproduction and torpor are considered to be incompatible for many mammals. Females used torpor during the reproductive season, but patterns changed with reproductive status. Prior to breeding, females used frequent (86% of days), deep and long torpor that was more pronounced than any other reproductive group, including pre-mating males (64% of days). Pregnant females continued to use torpor, albeit torpor was less frequent (28% of days) and significantly shorter and shallower than before breeding. Parturient and lactating females did not express torpor. During the mating period, males reduced torpor use (24% of days). Pre-reproductive females and pre-mating males were the least active and may use torpor to minimize predator exposure and enhance fat deposition in anticipation of the energetic demands associated with impending mating, gestation and lactation. Reproductive females were most active and likely foraged and fed to promote growth and development of young. Our data show that A. flavipes are balancing energetic demands during the reproductive season by modifying torpor and activity patterns. As the timing of reproduction is fixed for this genus, it is probable that climate change will render these behavioural and physiological adaptations as inadequate and threaten this and other semelparous species.
Start Date: 2020
End Date: 2022
Funder: Australian Research Council
View Funded ActivityStart Date: 2017
End Date: 2019
Funder: Deutsche Forschungsgemeinschaft
View Funded ActivityStart Date: 12-2023
End Date: 12-2028
Amount: $1,009,570.00
Funder: Australian Research Council
View Funded ActivityStart Date: 04-2020
End Date: 06-2024
Amount: $392,310.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2022
End Date: 12-2025
Amount: $551,000.00
Funder: Australian Research Council
View Funded Activity