Digital Commons Network^™

Soil Seed Banks Of Fringing Salt Lake Vegetation In Arid Western Australia - Density, Composition And Implications For Postmine Restoration Using Topsoil, Eddie J. Van Etten, Brett Neasham, Sarah Dalgleish

Research outputs 2014 to 2021

Although studies of seed banks in arid ecosystems are commonplace, they are lacking for the large arid zone of Western Australia. Across the six major plant communities fringing a large salt lake within this zone, topsoil (0-5 cm depth) was collected from 12 to 36 sites per community. Samples were dried, spread out on a bed of vermiculite in seedling trays and placed in a well-watered glasshouse to determine the readily germinable component of the soil seed bank. Subsamples of topsoil were treated with smoke water, hot water or flooding to help determine seed bank of species with dormancy mechanisms. …

Exploring The Role Of Parents In Supporting Recreational Book Reading Beyond Primary School, Margaret K. Merga

Research outputs 2014 to 2021

Levels of aliteracy have been found to rise in adolescence, and this article explores the potential influence of parents on this trend. The views of adolescent students who took part in semi-structured interviews for the West Australian Study in Adolescent Book Reading (WASABR) provide insight into how parental support may change in the adolescent years. Student perspectives support earlier findings that there is an expiration of parental encouragement in many cases, though this sometimes occurs as children are avid readers and thus the support is no longer deemed necessary. The experiences of students with parents who provided continued encouragement into …

Young Australian Adults’ Reactions To Viewing Personalised Uv Photoaged Photographs, Lori L. Presti, Paul Chang, Myra F. Taylor

Research outputs 2014 to 2021

Background: Despite two nationwide sun-protection awareness campaigns, young Australian adults continue to sunbathe. Since their primary motivation for tanning is appearance enhancement, it may well be that campaigns that highlight the negative effects of tanning on appearance are more effective than campaigns that emphasise the health risks associated with sun exposure.Aims: This study aims to explore young adults’ reactions to viewing a photoaged photograph of the sun damage already visible in their facial image.Methods: Semi-structured interviews were conducted with seven females and three males aged 20-30 years. The interview transcripts were transcribed verbatim and were then subjected to Interpretive Phenomenological …

The Use Of Unregulated Staff: Time For Regulation?, Christine M. Duffield, Di E. Twigg, Judith D. Pugh, Gemma Evans, S Dimitrelis, Michael A. Roche

Research outputs 2014 to 2021

Internationally, shortages in the nursing workforce, escalating patient demands, and financial constraints within the health system have led to the growth of unlicensed nursing support workers. Recently, in relation to the largest publicly funded health system (National Health Service), it was reported that extensive substitution of registered nurses with unskilled nursing support workers resulted in inadequate patient care, increased morbidity and mortality rates, and negative nurse outcomes. We argue that it is timely to consider regulation of nursing support workers with their role and scope of practice clearly defined. Further, the addition of these workers in a complementary model of …

Identification Of Unknowns Within A Probabilistic System: The Diagnostic Value Of Attributes, D W. Goodall

Research outputs 2014 to 2021

Using a data base underpinned by probability considerations in which a variety of attributes, some of which may be quantitative, are recorded for a number of “operational taxonomic units” (OTUs), a key system is described by which an unnamed specimen may quickly be identified. The concept of “diagnostic power” is introduced, by which each attribute is evaluated in terms of its potential contribution to identifying the unnamed specimen. Besides coverage of different types of attributes and the introduction of “diagnostic power”, the system has the advantages of incorporating multiple values of an attribute for each OTU and offering short-cuts to …

Metals In Commonly Eaten Groceries In Western Australia: A Market Basket Survey And Dietary Assessment, Anna Callan, Andrea Hinwood, Amanda Devine

Research outputs 2014 to 2021

Children’s dietary exposure to metals has received limited attention in Australia. This study undertook a market basket survey and analysed 253 food and beverages for metals. These data were used in conjunction with recent average diet data for children in Western Australia to model dietary metals exposure, with mean metals intakes calculated for boys and girls aged 8, 12, 13 and 16 years. Results show that for some metals, including cadmium, nickel and manganese, dietary intake guidelines have been exceeded in younger children. The mean modelled cadmium intake in children aged 8 years was almost 60% of the World Health …

Remote Beehive Monitoring Using Acoustic Signals, Amro Qandour, Iftekhar Ahmad, Daryoush Habibi, Mark Leppard

Research outputs 2014 to 2021

Recent developments in Wireless Sensor Networks (WSNs) have led to their use in remote data acquisition and automatic data analysis applications, which have proven to be an invaluable tool in a diverse range of fields including biosecurity. Further indications have been found that honeybee health can be monitored and determined through the use of acoustic analysis. In this paper, we present a system that has the ability to remotely detect the presence of pest infestation on a colony of honeybees by comparing the acoustic fingerprint of a hive to a fingerprint of known status. This will aid the goals of …

Dystonia Type 6 Gene Product Thap1: Identification Of A 50 Kda Dna-Binding Species In Neuronal Nuclear Fractions, Maitane Ortiz-Virumbrales, Marta Ruiz, Eugene Hone, Georgia Dolios, Rong Wang, Andrika Morant, Jessica Kottwitz, Laurie J. Ozelius, Sam Gandy, Michelle Ehrlich

Research outputs 2014 to 2021

Mutations in THAP1 result in dystonia type 6, with partial penetrance and variable phenotype. The goal of this study was to examine the nature and expression pattern of the protein product(s) of the Thap1 transcription factor (DYT6 gene) in mouse neurons, and to study the regional and developmental distribution, and subcellular localization of Thap1 protein. The goal was accomplished via overexpression and knock-down of Thap1 in the HEK293T cell line and in mouse striatal primary cultures and western blotting of embryonic Thap1-null tissue. The endogenous and transduced Thap1 isoforms were characterized using three different commercially available anti-Thap1 antibodies and validated …

Recent Developments In R.F. Magnetron Sputtered Thin Films For Ph Sensing Applications - An Overview, Devendra Maurya, Ali Sardarinejad, Kamal Alameh

Research outputs 2014 to 2021

pH sensors are widely used in chemical and biological applications. Metal oxides-based pH sensors have many attractive features including insolubility, stability, mechanical strength, electrocatalyst and manufacturing technology. Various metal oxide thin films prepared by radio frequency (R.F.) magnetron sputtering have attractive features, including high pH sensitivity, fast response, high resolution, good stability and reversibility as well as potential for measuring pH under conditions that are not favourable for the commonly used glass electrodes-based pH sensors. In addition, thin film pH sensors prepared by R.F. magnetron sputtering offer many advantages, such as ease of packaging, low cost through the use of …

A Combination Of Physical Activity And Computerized Brain Training Improves Verbal Memory And Increases Cerebral Glucose Metabolism In The Elderly, Tejal Shah, Giuseppe Verdile, Hamid R. Sohrabi, A Campbell, E Putland, C Cheetham, S Dhaliwal, M Weinborn, P Maruff, D Darby, Ralph N. Martins

Research outputs 2014 to 2021

Physical exercise interventions and cognitive training programs have individually been reported to improve cognition in the healthy elderly population; however, the clinical significance of using a combined approach is currently lacking. This study evaluated whether physical activity (PA), computerized cognitive training and/or a combination of both could improve cognition. In this nonrandomized study, 224 healthy community-dwelling older adults (60-85 years) were assigned to 16 weeks home-based PA (n = 64), computerized cognitive stimulation (n = 62), a combination of both (combined, n = 51) or a control group (n = 47). Cognition was assessed using the Rey Auditory Verbal Learning …

Analogue Angels And Digital Diamonds: Tracing The Origins Of New Media Art, John C. Ryan

Research outputs 2014 to 2021

This paper explores the key vocabularies, themes, ideas, artistic movements, and technological innovations contributing to the development of the digital arts over time. As new media theorists have argued, one of the defining features of the digital arts is the break-down of divisions between art forms, and between art and society (for example, Manovich 2001, 2005). This paper outlines how digital processes intersect with aesthetic and conceptual forms. Relevant frameworks, such as materiality, embodiment, hybridity, interactivity, and narrativity, form the origins of the genre. Digital artworks, like digital media, are interactive, participatory, dynamic, and customizable, incorporating shifting data flows and …

The Transformation Of Archival Philosophy And Practice Through Digital Art, John C. Ryan

Research outputs 2014 to 2021

In many ways, digital practices have precipitated remarkable changes in the global accessibility of art. However, the digital revolution has also radically influenced the conservation processes surrounding art, including archiving, preserving, and remembering. This paper explores the conservation of digital (or “variable media”) artworks for the future benefit of culture, with particular peference to creators and viewers of art, as well as participants in interactive artworks. More specifically, this paper focuses on the philosophical and technical approaches adopted by creators, conservators, and philosophers involved in the preservation of variable media artworks. Issues of programming, interoperability between archival systems, and enhanced …

Student Perceptions Of Online Interactive Versus Traditional Lectures; Or How I Managed Not To Fall Asleep With My Eyes Open, John A. O'Rourke, Susan J. Main, Martin G. Cooper

Research outputs 2014 to 2021

Universities are increasingly experimenting with the online domain to connect with busy and digital-savvy students and counter the decline in face-to-face lecture attendance More often than not universities are offering videoed lectures or PowerPoints with lecturer voice-overs as a way of delivering content. Evidence suggests that while these techniques may provide the flexibility required, some content needs more personalised delivery. In this article the authors explore the development and delivery of an online lecture format. Using a combination of video, text and interactive cell technology, this online offering was trialed in a unit focused on the education of students with …

Bastard Immigrants: Asylum Seekers Who Arrive By Boat And The Illegitimate Fear Of The Other, Lelia R. Green, Anne Aly

Research outputs 2014 to 2021

The human capacity to marginalise and discriminate against others on the basis of innate and constructed characteristics is evident from the long history of discrimination against people whose existence is ‘illegitimate’, defined as being outside the law. What is inside or outside the law depends upon the context under consideration. For example, in societies such as ancient Greece and the antebellum United States, where slavery was legal, people who were constructed as ‘slaves’ could legitimately be treated very differently from ‘citizens’: free people who benefit from a range of human rights (Northup). The discernment of what is legitimate from that …

Beyond Madness: Ways To Foster Nonviolence In Human Systems, Marilyn J. Palmer

Research outputs 2014 to 2021

Positioned as an epilogue to the themed edition of Social Alternatives on the nature and politics of madness in contemporary Australian society, this article has been inspired by the narratives and analyses of the contributors to this edition. It aims to go beyond madness to explore _strategies of resistance to the violence of marginalisation, humiliation and incarceration which often comes before and after a diagnosis of madness. Proposed strategies for resistance include studying up and speaking back to the oppressors; improving the capacity of bystanders to intervene; holding a structural analysis of power and resistance to support social change work; …

Tracing The Maddening Effects Of Abuses Of Authority: Rationalities Gone Violent In Mental Health Services And Universities, Marilyn J. Palmer, Dyann Ross

Research outputs 2014 to 2021

Organisations such as mental health systems and universities can be places where violence is part of the business as usual and hence taken-for-granted functionality of the workplaces. The paper challenges dominant perceptions of who is mad and what is dangerous to unsettle the largely unquestioned legitimacy of indirect and mainly, but not always, non-coercive forms of organisational power. To enable this analysis the research and language of domestic violence is presented to help anchor the nature of organisational violence so that it doesn’t get ignored or deferred as non-problematic, as something that just happens somehow separate from peoples’ actions or …

Solar Energy Harvesting Clear Glass For Building-Integrated Photovoltaics, Kamal Alameh, Mikhail Vasiliev, Ramzy Alghamedi, Mohammad Alam, V. Rosenberg

Research outputs 2014 to 2021

We propose and demonstrate the concept of an energy-harvesting clear glass panel based on the use of all-inorganic luminophores embedded into a lamination layer in conjunction with low-emissivity coatings and CIS solar cells. Most of the visible solar radiation is transmitted through the laminated glass panel while UV radiation is down-converted and guided together with a part of infrared radiation to the edges for conversion to electricity by solar cells integrated at the edges of the glass panel. Experimental results demonstrate that a 10cmx10cm energy-harvesting clear glass can pass about 70% of the visible solar radiation, block 90% of UV …

The Internet And The Google Age: Introduction, Jonathan D. James

Research outputs 2014 to 2021

No abstract provided.

Biomineralization Of Carbonates In Modern Microbial Sediments And Its Implications For Co₂ Sequestration, Varun Gnanaprian Paul

Doctoral Dissertations

"Several bacterial species influence carbonate mineral precipitation by modifying pH, alkalinity, Ca²⁺ activity and by providing nucleation sites for mineralization. Two studies have been undertaken to explore microbial influence in the mineralization of carbonates. In the first study, the ability of sulfate-reducing bacteria (SRB) to induce carbonate mineralization was investigated as a means to enhance mineral sequestration of CO₂. Sulfate-reducing bacteria enriched from hypersaline Storr's Lake, The Bahamas; Lake Estancia, New Mexico; and Great Salt Plains Lake, Oklahoma, were tested in reactors under varying CO₂ concentrations. Carbonate mineral precipitation was achieved only in reactors with Lake Estancia SRB community and …

Cerium-Based Conversion Coatings On Magnesium Alloys, Carlos E. Castaño

Doctoral Dissertations

"This research is primarily focused on gaining a better understanding of the deposition and corrosion behavior of cerium-based conversion coatings (CeCCs) on AZ31B and AZ91D Mg alloys. Deposition of homogenous and protective CeCCs was highly dependent on the surface preparation steps. The best results were obtained when Mg samples underwent grinding, acid cleaning, and alkaline cleaning processes. This reduced the number of active cathodic sites and promoted the formation of a protective Al-rich Mg oxide/hydroxide layer. Electrochemical properties of the CeCCs were also strongly correlated with morphological, microstructural, and chemical characteristics. Protective CeCCs were deposited on both AZ31 and AZ91 …

Graphite Aerogels And The Formation Mechanism Of Unusual Micron-Sized Rod And Helical Structures, Clarissa Ann Wisner

Doctoral Dissertations

"Pyrolysis at 800 ºC under argon has shown that polyimide (PI), polyacrylonitrile (PAN), polydicyclopentadiene (DCPD) and polybenzoxazine (PBO) aerogels are all viable alternatives to traditional resorcinol-formaldehyde (RF) aerogels as precursors to amorphous carbon aerogels. Subsequent high temperature pyrolysis at 2300 ºC of such carbon aerogels under helium has shown that amorphous carbon from PI and PBO yields the highest degree of graphitization, whereas from RF aerogels yields the lowest.

Those two types of graphite aerogels include also a high concentration of micron-size columnar and helical (screw-like) structures, whose formation is favored by macroporosity and high nitrogen retention in the 800 …

Investigation Of Fluids Flow Behavior In Nano-Scale Channels By Using Optic Imaging System, Qihua Wu

Doctoral Dissertations

"Tight gas and shale gas reservoirs are characterized to have small pores with diameters in nanometer (nm) range. The physics of fluid flow in nanopores is poorly understood. Knowing the fluid flow behavior in the nano-range channels is of major importance for stimulation design, gas production optimization and calculations of the relative permeability of gas in tight shale gas systems. In this work, a lab-on-chip approach for direct visualization of the fluid flow behavior in nano-scale channels was developed using an advanced epi-fluorescence microscopy method combined with a nano-fluidic chip. The nanofluidic chips with different dimensions were designed and fabricated. …

Preformed Particle Gel Transport Through Fractures, Hao Zhang

Doctoral Dissertations

"Polymer gel treatment is one of the most cost-effective methods to control water production in mature oil fields. The main objective of gel treatments is to reduce water or gas flow through high-permeability channels or fractures without damaging productive zones. Preformed particle gels (PPGs) have been applied for conformance control because they can overcome some potential drawbacks inherent in an in-situ gelation system.

In this study, lab experiments were performed to quantify PPG propagation through fractures and fracture-like channels by using screen models and open fracture models. The main findings in these experiments can guide the selection of best particle …

Seismic Anisotropy And Mantle Flow Beneath Africa And Arabia, Ahmed Abdalla Elsheikh

Doctoral Dissertations

"In spite of numerous studies, the mechanisms for the rifting, uplifting, and volcanism on the African plate remain enigmatic. The most popular hypotheses proposed for explaining these tectonic phenomena involve edge-driven small-scale mantle convection and the thermal or dynamic effects of one or more mantle plumes. In this study we use continental scale shear-wave splitting (SWS) measurements to provide additional constraints on the various models of rifting, uplifting, and volcanism of the Cameroon Volcanic Line (CVL) and the Arabian plate. The splitting of P-to-S converted phases at the core-mantle boundary on the receiver side (XKS including PKS, SKKS, and SKS) …

Synthesis Of Radioactive And Nonradioactive Nanostructures Through Radiolytic And Wet Chemistry, Jessika Viviana Rojas Marin

Doctoral Dissertations

"In this work the synthesis of non radioactive and radioactive nanoparticles (NPs) through radiolytic and wet chemistry was studied. Non radioactive NPs of rhenium, iridium, and rhodium were synthesized from aqueous solutions containing the metal salt precursors by gamma irradiation. The solutions were irradiated to generate reducing species that led to the nucleation and growth of the nanoparticles. Amorphous rhenium oxide nanoparticles with average sizes ranging from 10 nm to 55 nm were obtained. Metallic iridium and rhodium nanoparticles were produced in polyvinyl-pyrrolidone (PVP) having narrow particle size distributions and average particle sizes from 2 nm to 6 nm. The …

Maximum Crosstalk Estimation And Modeling Of Electromagnetic Radiation From Pcb/High-Density Connector Interfaces, Matthew Scott Halligan

Doctoral Dissertations

"This dissertation explores two topics pertinent to electromagnetic compatibility research: maximum crosstalk estimation in weakly coupled transmission lines and modeling of electromagnetic radiation resulting from printed circuit board/high-density connector interfaces. Despite an ample supply of literature devoted to the study of crosstalk, little research has been performed to formulate maximum crosstalk estimates when signal lines are electrically long. Paper one illustrates a new maximum crosstalk estimate that is based on a mathematically rigorous, integral formulation, where the transmission lines can be lossy and in an inhomogeneous media. Paper two provides a thorough comparison and analysis of the newly derived maximum …

Identifying And Overcoming The Barriers To Sustainable Construction, Cristin Szydlik

Doctoral Dissertations

"Sustainable construction has become increasingly more prevalent over the last decade. All federal and most state government buildings are mandated to achieve Leadership in Energy and Environmental Design (LEED) certification (at the silver level at a minimum). Although sustainable construction is increasingly more common, there are still barriers to the successful completion of a sustainable project, specifically with regards to projects achieving LEED certification. There are still holes in the guidance on how to successfully achieve LEED certification. Even though government agencies have mandated LEED certification, the existing barriers are preventing buildings from achieving certification, which can delay the building …

Local Liquid Velocity Measurement Of Trickle Bed Reactor Using Digitial Industrial X-Ray Radiography, Khairul Anuar Mohd Salleh

Doctoral Dissertations

"Trickle Bed Reactors (TBRs) are fixed beds of particles in which both liquid and gas flow concurrently downward. They are widely used to produce not only fuels but also lubrication products. The measurement and the knowledge of local liquid velocities (VLL) in TBRs is less which is essential for advancing the understanding of its hydrodynamics and for validation computational fluid dynamics (CFD). Therefore, this work focused on developing a new, non-invasive, statistically reliable technique that can be used to measure local liquid velocity (V_LL) in two-dimensions (2-D). This is performed by combining Digital Industrial X-ray Radiography (DIR) and …

Plant Uptake Of Environmental Contaminants: Applications In Phytoscreening, Matthew Alan Limmer

Doctoral Dissertations

"Plants interact directly with their surroundings, extracting nutrients and water from the subsurface to support growth and development of the plant. Through the roots, plants also exude and uptake numerous chemicals. Many of the pathways can also be used by environmental contaminants to be translocated to above ground plant tissues. Such uptake of contaminants has proven useful in remediation and phytoscreening - the use of plants to delineate contaminant plumes. Sampling of trees at contaminated field sites has been used to identify areas of groundwater contaminated with a variety of chlorinated solvents. The use of plants as contaminant biosensors requires …

Phosphate-Doped Borosilicate Enamel Coating Used To Protect Reinforcing Steel From Corrosion, Xiaoming Cheng

Doctoral Dissertations

"Phosphate-doped sodium borosilicate glasses were developed for enamel coatings to provide corrosion protection for reinforcing steel in concrete. Phosphates have low solubilities in borosilicate glasses, generally less than about 4 mol%, and are incorporated mainly as isolated PO₄^3- and P₂O₇^4- anions, along with some borophosphate bonds. With the addition of P₂O₅, the silicate network is repolymerized and tetrahedral borates are converted to trigonal borates, because the phosphate anions scavenge sodium ions from the borosilicate network. The addition of Al₂O₃ significantly increases the solubility of P₂O …