Special data-reduction procedures for prairie network meteor photographs

Data reduction procedures for obtaining trajectory and luminosity data from meteor photograph

A theoretical study of meteoric trajectories and processes, including examination of the incidence and characteristics of photographic meteors by reduction of about 600 data points

Automatic reduction procedure for photographic meteor data - star identificatio

Lost City meteorite - It's recovery and a comparison with other fireballs

Photographic and trajectory data for Lost City meteor and establishment of calibration of mass scale of other meteor

Damage Development During Pin Loading Of A Hole In A Quasi-Isotropic Carbon Fibre Reinforced Epoxy Composite

Damage development and progression was monitored by acoustic emission during pin loading of a hole in a quasi-isotropic Hexcel F593/T300 W2G 190 carbon fibre reinforced epoxy composite. Analysis of the acoustic emissions showed that failure was initiated by fibre matrix debonding, followed by fibre fracture, and subsequent matrix cracking. Sections taken through the specimens at varying intervals between the initial acoustic emission and final catastrophic failure confirmed this sequence of events. Good agreement was obtained between the load at the onset of failure and that predicted by finite element modelling

Leveraging the online environment to remove barriers to student learning in large first year foundation subjects

This work is part of a larger three year project aimed at disseminating good practice in online learning and teaching throughout the Faculty of Science at The University of New South Wales (UNSW). Dissemination is based on a template Blackboard Vista site created for a large first year Materials Science course (Allen, Crosky, McAlpine, Hoffman and Monroe, 2006). A project group comprising members of several schools in the Science Faculty has been formed to manage the overall project and project funds have been used to employ an educational developer to work with academic teaching staff to modify and implement the template into courses from different schools across the faculty. The focus of the group is on large classes with a view to getting maximum impact (improved outcomes for the largest number of students). Fundamentals of Physics is one of the first courses to modify and implement the template as part of this project

Microbiologically influenced corrosion of cable bolts in underground coal mines: The effect of Acidithiobacillus ferrooxidans

Reports on corrosion failure of cable bolts, used in mining and civil industries, have been increasing in the past two decades. The previous studies found that pitting corrosion on the surface of a cable bolt can initiate premature failure of the bolt. In this study, the role of Acidithiobacillus ferrooxidans (A. ferrooxidans) bacterium in the occurrence of pitting corrosion in cable bolts was studied. Stressed coupons, made from the wires of cable bolts, were immersed in testing bottles containing groundwater collected from an underground coal mine and a mixture of A. ferrooxidans and geomaterials. It was observed that A. ferrooxidans caused pitting corrosion on the surface of cable bolts in the near-neutral environment. The presence of geomaterials slightly affected the pH of the environment; however, it did not have any significant influence on the corrosion activity of A. ferrooxidans. This study suggests that the common bacterium A. ferrooxidans found in many underground environments can be a threat to cable bolts’ integrity by creating initiation points for other catastrophic failures such as stress corrosion cracking

Application of Onset Theory to Onset of Transverse Cracking in Fabric Composites

A paper presented at ICCM-19 included a methodology for application of Onset Theory to the prediction of microcracking in the transverse plies of orthogonal [0/90] fabric laminates. This paper applies the methodology to predict damage locations and laminate strains for failure of plain weave fabric specimens manufactured from two material systems – HTS40/RTM6 and T300/CYCOM970. The laminate strains are first dehomogenised to define local strains in the tow architecture of the fabric. This is achieved using meso-mechanical unit cell analysis in which the resin and tows are modelled as continua. For a selection of predefined critical locations in the tow bundles, the strains are further dehomogenised using an identical procedure as the one defined for the uni-directional specimens in the previous applications. The influence of matrix plasticity and temperature dependent mechanical and thermal properties of the RTM6 resin are applied in the dehomogenisation procedure. The Onset theory predictions for damage locations were compared to those obtained from microscopic surveys of partially failed plain weave fabric specimens

Second International Conference on Performance-based and Lifecycle Structural Engineering (PLSE 2015)

Elementary kenaf fibres were separated by the HNO3 treatment and the H2O2/CH3COOH treatment. It was found that the HNO3 treatment caused fibre fragmentation causing a decrease in the fibre length and an increase in the fibre defect density. However, the H2O2/CH3COOH treatment was not strong as the HNO3 treatment and this had much less effect on the fibre length and the fibre defects. The fibres had an average length of 0.2 mm and 2.3 mm and an aspect ratio of 15 and 179 for the HNO3 treated fibres and the H2O2/CH3COOH treated fibres, respectively. The defect density of the HNO3 treated fibres and the H2O2/CH3COOH treated fibres was 21 and 14 defects/mm, respectively. Both the treatments removed lignin, pectin and waxes. They also increased cellulose crystallinity in the fibres, especially for the HNO3 treatment. However, these treatments resulted in some oxidation of cellulose to occur