Science Collected Works - Research Publications
Permanent URI for this collection
Search Results
1 - 10 of 126
-
ItemElectric field enhancement in Au and Ag nanodisks-based photonic crystals: Relevant design insights for efficient SERS substrates(Elsevier, 2023-07)In recent years, noble metal nanoparticle-based periodic nanoarrays (photonic crystals) have received special attention due to their gross potential to achieve exceptionally high Electric-Near Field Enhancement (ENFE) factors for visible light and their prospects as candidates for the fabrication of ultra-sensitive Surface-Enhanced Raman Spectroscopy (SERS) substrates. In this work, we report a simple but exhaustive theoretical analysis of the ENFE in Au and Ag nanodisks-based photonic crystals by Finite-Difference Time-Domain (FDTD) method. Nanostructures with arrays periodicities from 200 to 1000 [nm], nanodisks diameters from 100 to 500 [nm] and thicknesses from 20 to 200 [nm] were studied. Results show that the ENFE is strongly dependent on each one of these geometrical parameters, observing |E/E0|2 factors that can reach up to 1200 for the visible light spectrum. The effects of nanodisks surface curvature-based defects on the ENFE were also analyzed. This kind of defects seem to be also relevant to maximize the ENFE effects, observing that higher surface curvatures tend to considerably attenuate the electric field amplification. Our research provides relevant insights on the design optimization of this kind of photonic crystals to maximize the ENFE effects, which is a critical issue to assess the future fabrication conditions of efficient SERS substrates.
-
ItemConverging Currents: Memories of Migration, Diplomacy and the Gathering Winds of Ngukurr(Simon Normand, 2022)
-
Item
-
Item
-
ItemWho is Country? A Hermeneutic Strategy Toward Philosophical Responsiveness in Australia(Open Humanities Press, 2023)Within Australian society, the term ‘Country’ is used to acknowledge prior and ongoing Indigenous Australian connections to specific lands, waters, and skies, challenging any supposed neutrality of public, cultural, or institutional spaces. However, use of the term ‘Country’ might also slide into unreflective abstraction when disconnected from the nourishing interactions of particular people and places that the term in its fullness can embody. In this paper, we seek to dispel conjectural mists that can surround the notion of ‘Country’ in popular societal use by attending to various relational dynamics which configure and substantiate its meaning. Engaging with Warlpiri (Aboriginal Australian) epistemology and the pedagogic strategies of Warlpiri scholar and co-author, Wanta Jampijinpa Pawu, we propose the seemingly odd question, who is country? as a hermeneutic strategy—an approach which embraces a grounded ontology that ‘lowercases’ meaning as essentially relational and figured within shared identities. We indicate similar tonalities in the contextual hermeneutics of prominent Indigenous Australian theologians, who challenge latent abstractions of theism lurking within pronouncements of meaning as disembodied from real contexts of people and place.
-
ItemNo Preview AvailableSperm Syringe: 3D Sorting Platform for Assisted Reproduction (Adv. Mater. Technol. 9/2022)(Wiley, 2022-09)In article number 2101291, Reza Nosrati and co-workers develop a scalable 3D sorting platform for one-step semen purification and high-quality sperm selection. The Sperm Syringe selects sperm with over 65% improvement in both DNA integrity and morphology, considerably outperforming the current best clinical practices for sperm selection in assisted reproduction.
-
ItemNo Preview AvailableBalancing-sequencing paced assembly lines: a multi-objective mixed-integer linear case study(TAYLOR & FRANCIS LTD, 2023-09-02)
-
ItemNo Preview AvailableAn exact method to incorporate ergonomic risks in Assembly Line Balancing Problems(PERGAMON-ELSEVIER SCIENCE LTD, 2023-09)
-
ItemMorphodynamics of an erodible channel under varying discharge(WILEY, 2021-09-30)Abstract Alluvial channels arise through the interaction between morphology, hydraulics, and sediment transport, known as the ‘fluvial trinity’. Over relatively short timescales where climate and geology are fixed but discharge and sediment supply may vary, this process facilitates adjustments towards steady state, where the system oscillates around a mean condition. The relationship between changes in conditions and geomorphic response may be highly complex and nonlinear, especially in systems with multiple modes of adjustment. This study examines the adjustment of an erodible channel with fixed banks and a widely graded sediment mixture to successive increases in discharge. With each increase in discharge, components of the fluvial trinity adjusted towards a steady state. Particularly at relatively low discharges, adjustments were controlled by intrinsic thresholds and highlighted important morphodynamic processes. Notably, there was a strong interplay between channel morphology and sediment transport, and an effect whereby larger‐than‐average grains controlled channel deformation. These two processes occurred at the bar scale and were highly spatialised, which has two important implications: (1) reach‐averaged representations of process provide only partial insight into morphodynamics; and (2) models of rivers that suppress these process feedbacks and size‐dependent transport may not replicate morphodynamics that typically occur in field conditions. The experiments provide quantitative evidence for conceptual models describing exponential approaches towards steady state and the potential for transiency if disturbance frequency exceeds the recovery time. They also highlight how in natural rivers, particularly those with greater degrees of freedom for adjustment (notably, lateral adjustment and meandering), continuous changes in discharge may lead to nonlinear rather than steady‐state behaviour. In these settings, more holistic analytical frameworks that embrace different aspects of the system are critical in understanding the direction, magnitude and timing of channel adjustments.
-
ItemMovement and ranging behaviour of long-nosed potoroos (Potorous tridactylus) in south-west Victoria, Australia(CSIRO Publishing, 2023)Context. A comprehensive understanding of movements and space use can underpin the effective management of threatened species. GPS dataloggers can collect large amounts of high-quality movement data, and recent advances in statistical approaches allow for robust estimates of home range size to be generated. Until recently, technological and practical constraints have generally restricted the collection of movement data via GPS dataloggers to larger species. However, reductions in the size and weight of GPS dataloggers now allow for this technology to be applied to smaller species. Aims. The aim of this study was to describe the home range and movement patterns of a nationally vulnerable, native Australian ground-dwelling mammal, the long-nosed potoroo (Potorous tridactylus), in south-west Victoria, mainland Australia. Methods. We attached GPS dataloggers to 40 long-nosed potoroos between 2020 and 2022 and estimated home range size using dynamic Brownian Bridge movement models. We evaluated the influence of physiological factors such as body mass and sex on home range size and described patterns of home range overlap between and within sexes. Key results. Mean home range sizes were estimated to be 13.73 ha (95% CI: 10.9–16.6) and 6.67 ha (95% CI: 5.49–7.85) for males and females respectively. Home range size scaled with body mass in males but not females, and ranges were largely overlapping – although there was some evidence of intrasexual spatial partitioning of core range areas in females. Conclusions. Ours is the first application of GPS dataloggers to this species, and our home range estimates are over twice as large as other reported estimates for mainland Australia. Long-nosed potoroos may range across larger areas than previously predicted on mainland Australia. Implications. This knowledge may be used to optimise the management of long-nosed potoroo populations before and after fire – a key threatening process for this species. Our study highlights the value of integrating GPS dataloggers and robust home range estimators when describing the movement ecology of a population.