ORCID Profile
0000-0003-1222-6384
Current Organisation
University of Wollongong
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Manufacturing engineering | Tribology | Mining engineering | Manufacturing processes and technologies (excl. textiles) |
Publisher: Society of Exploration Geophysicists of Japan
Date: 21-11-2013
Publisher: American Geophysical Union (AGU)
Date: 03-2020
DOI: 10.1029/2019JB019011
Abstract: The composition of the lower continental crust is well studied but poorly understood because of the difficulty of s ling large portions of it. Petrological and geochemical analyses of this deepest portion of the continental crust are limited to the study of high‐grade metamorphic lithologies, such as granulite. In situ lower crustal studies require geophysical experiments to determine regional‐scale phenomena. Since geophysical properties, such as shear wave velocity (Vs), are nonunique among different compositions and temperatures, the most informative lower crustal models combine both geochemical and geophysical knowledge. We explored a combined modeling technique by analyzing the Basin and Range and Colorado Plateau of the United States, a region for which plentiful geochemical and geophysical data are available. By comparing seismic velocity predictions based on composition and thermodynamic principles to ambient noise inversions, we identified three compositional trends in the southwestern United States that reflect three different geologic settings. The Colorado Plateau (thick crust), Northern Basin and Range (medium crust), and Southern Basin and Range (thin crust) have intermediate, intermediate‐mafic, and mafic deep crustal compositions. Identifying the composition of the lower crust depends heavily on its temperature because of the effect it has on rock mineralogy and physical properties. In this region, we see evidence for a lower crust that overall is intermediate‐mafic in composition (53.7 7.2 wt.% SiO ) and notably displays a gradient of decreasing SiO with depth.
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 08-2020
Publisher: Zenodo
Date: 2018
Publisher: Inderscience Publishers
Date: 2021
Publisher: ENGG Journals Publications
Date: 30-06-2017
Publisher: Elsevier BV
Date: 08-2017
Publisher: American Geophysical Union (AGU)
Date: 15-04-1996
DOI: 10.1029/96GL00739
Publisher: Trans Tech Publications, Ltd.
Date: 10-03-2017
DOI: 10.4028/WWW.SCIENTIFIC.NET/JERA.29.45
Abstract: Polycrystalline Diamond Compact (PDC) cutters have been popularly used in recent times due to their resistance against mechanical and thermal wear. This paper was focused on interface geometries between the substrate and the diamond table. Various types of interfaces were designed, to investigate how different interface geometries influence distribution of stress and strain under shear loading. The interface geometries examined in this paper included castle interface, dent interface, honeycomb interface and chase interface. Parallel to the interface, shear loading was applied to the top of diamond table to mimic the shear loading component from the rock cutting. To apply the shear loading, two locations were considered for each of the geometries. These locations differed depending on the interface features. Stress and strain distribution and values across different interface geometries were analysed with the aid of 3D Finite Element Method (FEM). The numerical simulations indicated that stress and strain magnitudes and distribution patterns varied in relation to different geometries. Some substrates showed relatively lower plastic strain representing higher durability of the geometries. Concentration of stress and strain distribution showed the areas where one could expect weakness. It also implies that rotating the PDC cutter assemblies around their cylindrical axis helps avoiding fatigue of interface elements in regions of high stress concentration and thus, preventing premature failure of interface elements.
Publisher: Inderscience Publishers
Date: 2020
Publisher: Research Square Platform LLC
Date: 07-02-2023
DOI: 10.21203/RS.3.RS-2557207/V1
Abstract: We propose a non-ordinary state-based (NOSB) peridynamics models for (i) stress concentration in a plate with a hole under static loading, (ii) blast induced dynamic brittle fracture process and (iii) subsurface blast induced damage in steel reinforced concrete. In this model formulation, fractures take their own natural paths. Damage is captured through a scalar damage variable that transits from an intact state of the material to the fully damaged state in a sharp yet smooth manner. The proposed blast formulation considers the effect of conversion of a material state from solid (explosives reactants) to gaseous state (products) during shock wave detonation. The pressure in explosive gas is evaluated using an equation of state. The interaction between gas and rock is modelled using extrapolated stress based on the considerations of stress continuity and numerical stability at the solid-gas interface. The equations that govern the mechanical deformation and damage, are in the form of coupled integrodifferential equations derived based on the Hamilton’s principle. Proposed formulation captures the initial radial cracks and spall fracture in the rock medium under explosive induced both shock energy and gas energy, and the subsurface damaged zone in the steel reinforced concrete medium. The simulation results of all the three peridynamics models are compared and validated with published results.
Publisher: Wiley
Date: 08-03-2020
Publisher: ARMA
Date: 25-06-2023
Publisher: CRC Press
Date: 28-06-2023
Publisher: Australian Centre for Geomechanics, Perth
Date: 2008
Publisher: Springer Science and Business Media LLC
Date: 26-11-2013
Publisher: Springer Science and Business Media LLC
Date: 15-02-2022
Publisher: Elsevier BV
Date: 04-2021
Publisher: CRC Press
Date: 03-06-2021
Publisher: Wiley
Date: 25-07-2023
DOI: 10.1111/GEB.13735
Abstract: We have little understanding of how communities respond to varying magnitudes and rates of environmental perturbations across temporal scales. BioDeepTime harmonizes assemblage time series of presence and abundance data to help facilitate investigations of community dynamics across timescales and the response of communities to natural and anthropogenic stressors. BioDeepTime includes time series of terrestrial and aquatic assemblages of varying spatial and temporal grain and extent from the present‐day to millions of years ago. BioDeepTime currently contains 7,437,847 taxon records from 10,062 assemblage time series, each with a minimum of 10 time steps. Age constraints, s ling method, environment and taxonomic scope are provided for each time series. The database includes 8752 unique s ling locations from freshwater, marine and terrestrial ecosystems. Spatial grain represented by in idual s les varies from quadrats on the order of several cm 2 to grid cells of ~100 km 2 . BioDeepTime in aggregate currently spans the last 451 million years, with the 10,062 modern and fossil assemblage time series ranging in extent from years to millions of years. The median extent of modern time series is 18.7 years and for fossil series is 54,872 years. Temporal grain, the time encompassed by in idual s les, ranges from days to tens of thousands of years. The database contains information on 28,777 unique taxa with 4,769,789 records at the species level and another 271,218 records known to the genus level, including time series of benthic and planktonic foraminifera, coccolithophores, diatoms, ostracods, plants (pollen), radiolarians and other invertebrates and vertebrates. There are to date 7012 modern and 3050 fossil time series in BioDeepTime. SQLite, Comma‐separated values.
Publisher: Elsevier BV
Date: 12-2013
Publisher: Elsevier BV
Date: 04-1999
Publisher: Inderscience Publishers
Date: 2020
Publisher: IntechOpen
Date: 18-03-2020
Publisher: Australian Centre for Geomechanics, Perth
Date: 2010
Publisher: Elsevier BV
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 18-10-2022
DOI: 10.1007/S42461-022-00690-1
Abstract: This paper presents the optimum auxiliary fan(s) location to control air recirculation in dead-end workings where diesel-powered vehicles operate. Investigations were conducted with various secondary fan locations from the dead-end crosscut with varying the intake air quantities using a 30 m 3 /s capacity twin 75 kW auxiliary fan and 45 m 3 /s capacity twin 110 kW auxiliary fan to control air recirculation and DPM. The results showed that if the drive intake airflow rate matches the fan capacity, air recirculation will occur even when the fan is located 10 m away from the crosscut entry. Results also showed that if the intake drive air quantity was greater than or equal to 150% of fan capacity, no recirculation was observed when the twin 75 kW fan location was at least 5 m and the twin 110 kW fan location was at least 10 m away from the dead-end crosscut access.
Publisher: Elsevier BV
Date: 10-2017
Publisher: IEEE
Date: 2017
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 2022
DOI: 10.2139/SSRN.4149505
Publisher: CRC Press
Date: 03-06-2021
Publisher: Springer Science and Business Media LLC
Date: 24-08-2019
Publisher: Australian Centre for Geomechanics, Perth
Date: 2005
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2020
Publisher: Elsevier BV
Date: 02-1996
Publisher: Elsevier BV
Date: 07-2011
Publisher: IEEE
Date: 04-2016
Publisher: Australian Centre for Geomechanics, Perth
Date: 2013
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 12-2019
Publisher: ENGG Journals Publications
Date: 31-08-2017
Publisher: Elsevier BV
Date: 08-2023
Publisher: SAGE Publications
Date: 10-09-2014
Abstract: Retrospective cohort study. Lumbosacral transitional vertebrae (LSTV) are a common congenital anomaly, and they can be accurately identified on anteroposterior (AP) radiographs of the lumbosacral spine. This study attempts to determine the prevalence of this congenital anomaly and to increase awareness among all clinicians to reduce the risk of surgical and procedural errors in patients with LSTV. A retrospective review of 5,941 AP and lateral lumbar radiographs was performed. Transitional vertebrae were identified and categorized under the Castellvi classification. The prevalence of LSTV in the study population was 9.9%. Lumbarized S1 and sacralized L5 were seen in 5.8 and 4.1% of patients, respectively. LSTV are a common normal variant and can be a factor in spinal surgery at incorrect levels. It is essential that all clinicians are aware of this common congenital anomaly.
Publisher: Inderscience Publishers
Date: 2020
Publisher: Glowny Instytut Gornictwa (Central Mining Institute)
Date: 11-04-2021
Publisher: Elsevier BV
Date: 09-2018
Publisher: Springer Science and Business Media LLC
Date: 31-03-2022
Publisher: Springer Science and Business Media LLC
Date: 19-04-2020
Location: Australia
Start Date: Start date not available
End Date: End date not available
Funder: Australian Coal Association Research Program
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Funder: Australian Coal Association Research Program
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Funder: Australian Coal Association Research Program
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Funder: Australian Mineral Industry Research Association Limited
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Funder: Australian Coal Association Research Program
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Funder: Australia-India Strategic Research Fund
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Funder: National Institute of Advanced Industrial Science and Technology
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Funder: Minerals Council of Australia
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Funder: Board of Research in Nuclear Sciences
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End Date: End date not available
Funder: Department of Atomic Energy, Government of India
View Funded ActivityStart Date: 05-2023
End Date: 05-2028
Amount: $4,969,602.00
Funder: Australian Research Council
View Funded Activity