Adelaide Research & Scholarship
Adelaide Research & Scholarship (AR&S) is the University of Adelaide’s digital repository. AR&S provides a platform for the collection, organisation, access and preservation of the research and scholarly outputs of the University community in digital formats, as well as digital management of information in physical formats.
University of Adelaide higher degree by research theses are deposited into the AR&S Theses community as part of the final thesis lodgement process.
AR&S also serves as the home of the digital collections of University Library Archives and Special Collections. Items include digitized representations of physical items, such as photographs and full texts, and digital-born materials, allowing worldwide access to our heritage and research collections.
Are you a University of Adelaide researcher who would like your publications in AR&S? See our support page.
Contact us. Please email Library Discovery.
Communities in Adelaide Research & Scholarship
Select a community to browse its collections.
Recent Submissions
Optimizing Chance-Constrained Submodular Problems with Variable Uncertainties
(IOS Press, 2023) Yan, X.; Do, A.V.; Shi, F.; Qin, X.; Neumann, F.; 26th European Conference on Artificial Intelligence (ECAI) (30 Sep 2023 - 4 Oct 2023 : Kraków, Poland); Fujita, H.; Perez-Meana, H.; Hernandez-Matamoros, A.
Chance constraints are frequently used to limit the probability of constraint violations in real-world optimization problems where the constraints involve stochastic components. We study chance-constrained submodular optimization problems, which capture a wide range of optimization problems with stochastic constraints. Previous studies considered submodular problems with stochastic knapsack constraints in the case where uncertainties are the same for each item that can be selected. However, uncertainty levels are usually variable with respect to the different stochastic components in real-world scenarios, and rigorous analysis for this setting is missing in the context of submodular optimization. This paper provides the first such analysis for this case, where the weights of items have the same expectation but different dispersion. We present greedy algorithms that can obtain a high-quality solution, i.e., a constant approximation ratio to the given optimal solution from the deterministic setting. In the experiments, we demonstrate that the algorithms perform effectively on several chance-constrained instances of the maximum coverage problem and the influence maximization problem.
Complete genome sequence of a methicillin-resistant Staphylococcus aureus strain 63-2498, isolated from a diabetic foot infection
(American Society for Microbiology, 2025) Adams, F.G.; Sapula, S.A.; Hart, B.J.; Warner, M.S.; Speck, P.G.; Putonti, C.
Here, we report the complete genome sequence of methicillin-resistant Staphylococcus aureus 63-2498, isolated from an outpatient with a diabetic foot infection. The 2.82 Mbp genome with 2,663 predicted coding sequences was assembled using a hybrid approach combining PacBio HiFi long-read and Illumina short-read sequencing, resulting in one chromosome and three plasmids.
Drought-induced plant microbiome and metabolic enrichments improve drought resistance
(Cell Press, 2025) Li, J.; Liu, H.; Wang, J.; Macdonald, C.A.; Singh, P.; Cong, V.T.; Klein, M.; Delgado-Baquerizo, M.; Singh, B.K.
Plant-microbiome interactions are crucial in maintaining plant health and productivity under stress; however, little is known about these interactions under drought. Here, using wheat as a model, we combine genomics and culture-dependent methods to investigate the interactions between the soil, root, and rhizosphere microbiomes with rhizosphere metabolomes and plant phenotypes. We find that drought conditions promote microbial colonization in plant microbiomes, enriching Streptomyces coeruleorubidus and Leifsonia shinshuensis, while also increasing 4-oxoproline levels in the rhizosphere, potentially attracting S. coeruleorubidus. Consistently, genes facilitating microbial responses to drought, including the N-terminal acetyltransferase rimJ, are enriched, while S. coeruleorubidus and L. shinshuensis reintroduction promotes host drought resistance. Drought-legacy-effect experiments further support these benefits, with increased plant biomass and yield in the subsequent growth cycle under drought. Collectively, this study informs how drought-induced microbial and metabolite enrichments improve plant adaptation to abiotic stresses, potentially informing development of bio-based tools to mitigate drought effects.
Mechanical design of the optical modules intended for IceCube-Gen2
(Sissa Medialab Srl, 2024) Abbasi, R.; Ackermann, M.; Adams, J.; Agarwalla, S.K.; Aguilar, J.A.; Ahlers, M.; Alameddine, J.M.; Amin, N.M.; Andeen, K.; Anton, G.; Argüelles, C.; Ashida, Y.; Athanasiadou, S.; Audehm, J.; Axani, S.N.; Bai, X.; Balagopal, A.V.; Baricevic, M.; Barwick, S.W.; Basu, V.; et al.; 38th International Cosmic Ray Conference (ICRC) (26 Jul 2023 - 3 Aug 2023 : Nagoya, Japan)
IceCube-Gen2 is an expansion of the IceCube neutrino observatory at the South Pole that aims to increase the sensitivity to high-energy neutrinos by an order of magnitude. To this end, about 10,000 new optical modules will be installed, instrumenting a fiducial volume of about 8 km3. Two newly developed optical module types increase IceCube’s current sensitivity per module by a factor of three by integrating 16 and 18 newly developed four-inch PMTs in specially designed 12.5-inch diameter pressure vessels. Both designs use conical silicone gel pads to optically couple the PMTs to the pressure vessel to increase photon collection efficiency. The outside portion of gel pads are pre-cast onto each PMT prior to integration, while the interiors are filled and cast after the PMT assemblies are installed in the pressure vessel via a pushing mechanism. This paper presents both the mechanical design, as well as the performance of prototype modules at high pressure (70 MPa) and low temperature (-40 ◦C), characteristic of the environment inside the South Pole ice.
EBSD mapping of Cu-Fe-sulfides reveal microstructures enriched in critical/precious metals and resolve deformation histories
(Mineralogical Society of America, 2025) King, S.A.; Cook, N.J.; Ciobanu, C.L.; Ehrig, K.; Rodriguez, Y.T.C.; Gilbert, S.; Basak, A.; Kiseeva, K.
Chalcopyrite (CuFeS₂) and bornite (Cu₅FeS₄) from the Olympic Dam Cu-U-Au-Ag deposit (South Australia) are characterized using electron backscatter diffraction (EBSD) to identify microstructures and their correlations with trace element concentrations measured by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Natural chalcopyrite is shown to be a rich source of micro-structural and -textural information, preserving <110> and <001> crystallographic preferred orientations (CPO), {110} and {112} twin systems, grain boundary migration, foam textures, and subgrain boundaries. Selected examples of chalcopyrite illustrate different aspects of its behavior and relationship with bornite across the mineralogically zoned deposit. The oriented stress imposed by brecciation and/or fluid fluxes at Olympic Dam, alongside temperature, pressure, and strain rate, is shown to induce various microstructures preserved in chalcopyrite. Microstructures can, therefore, be used to elucidate sequential stages of low- to medium-temperature (<300 °C) ore evolution. Pyrite microstructures are already routinely used to understand higher temperature ore evolution, and the complementary microstructural study of chalcopyrite coexisting with pyrite has the potential to reveal deformational events across a more complete range of temperatures. Chalcopyrite is particularly well suited to unravel episodes of low- to medium-temperature overprinting in ore systems that lack obvious evidence for post-mineralization deformation. EBSD mapping reveals what appears as single grains of chalcopyrite in reflected light are, in fact, aggregates composed of ∼100 individual grains. In contrast, analyzed bornite displays overwhelming crystallographic homogeneity. Rare instances of misorientation in bornite are all associated with replacement and, if correlated with EBSD analysis of coexisting chalcopyrite and its inclusions (e.g., cobaltite), can be used to discern the origin and evolution of different bornite associations. LA-ICP-MS trace element mapping of chalcopyrite aggregates indicates that grain boundaries host Pb, Bi, Ag, and Sb concentrations, with twin boundaries displaying a weaker concentration of the same elements. Bornite grain boundaries are also enriched in Pb. These observations confirm the critical role played by microstructures in Cu-(Fe)-sulfides as traps for Pb, a non-target contaminant in copper concentrates, as well as new evidence for the physical state of Ag and potential value-added critical metals like Bi and Sb. The preferential occurrence of Pb, Bi, Ag, and Sb along permeable grain boundaries may incentivize efforts to remove contaminants and/or recover by-products via leaching.