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Rodney Stewart is Professor and Deputy Head of School (Research) at the School of Engineering and Built Environment based at Griffith University, Gold Coast City, Queensland Australia. He is an expert in engineering, construction and environmental engineering and management research. His current particular area of research focus is digital utility transformation. Professor Stewart is leading industry collaborative research projects that seek to integrate 'big data' metering and monitoring technologies and associated expert systems into infrastructure, particularly in the water and energy utility sector, to better manage these critical resources and better integrate contemporary solutions such as renewable energy and decentralised water supply.
Understanding the residential adoption decision of battery energy storage systems (BESSs) is central to the implementation of successful intervention policies. However, when the residential solar photovoltaics (PV) becomes a widely accepted technology across a society, accurately modelling the behaviour shows a higher degree of complexity. In this vein, the uptake pathway of BESS and PV coupled with BESS (PV–BESS) would predictably exhibit similar attitudinal traits to that of PV consumption. This notion implies that the antecedent PV decision can be regarded as the past behaviour of the BESS adopter by creating attitudinal implications. The PV use status also yields a higher degree of heterogeneity through the emergence of four new household groups and the inherent imbalances in the involvement of the interwoven financial, technical, sociodemographic, and psychological predictors. This perspective employs the Reasoned Action Approach (RAA) to allegorise a decision-making model of BESS and PV–BESS adoption behaviour in a mature PV market (Australia). It argues that the particularised background factors will likely shape the individual’s attitudes and perceived norms for intention, and showcases affordability and the use of PV as the two control components that dictate the final decision.
Mohammad Alipour; Rodney A. Stewart; Oz Sahin. Beyond the Diffusion of Residential Solar Photovoltaic Systems at Scale: Allegorising the Battery Energy Storage Adoption Behaviour. Energies 2021, 14, 5015 .
AMA StyleMohammad Alipour, Rodney A. Stewart, Oz Sahin. Beyond the Diffusion of Residential Solar Photovoltaic Systems at Scale: Allegorising the Battery Energy Storage Adoption Behaviour. Energies. 2021; 14 (16):5015.
Chicago/Turabian StyleMohammad Alipour; Rodney A. Stewart; Oz Sahin. 2021. "Beyond the Diffusion of Residential Solar Photovoltaic Systems at Scale: Allegorising the Battery Energy Storage Adoption Behaviour." Energies 14, no. 16: 5015.
Most accidents in the aviation, maritime, and construction industries are caused by human error, which can be traced back to impaired mental performance and attention failure. In 1596, Du Laurens, a French anatomist and medical scientist, said that the eyes are the windows of the mind. Eye tracking research dates back almost 150 years and it has been widely used in different fields for several purposes. Overall, eye tracking technologies provide the means to capture in real time a variety of eye movements that reflect different human cognitive, emotional, and physiological states, which can be used to gain a wider understanding of the human mind in different scenarios. This systematic literature review explored the different applications of eye tracking research in three high-risk industries, namely aviation, maritime, and construction. The results of this research uncovered the demographic distribution and applications of eye tracking research, as well as the different technologies that have been integrated to study the visual, cognitive, and attentional aspects of human mental performance. Moreover, different research gaps and potential future research directions were highlighted in relation to the usage of additional technologies to support, validate, and enhance eye tracking research to better understand human mental performance.
Daniel Martinez-Marquez; Sravan Pingali; Kriengsak Panuwatwanich; Rodney Stewart; Sherif Mohamed. Application of Eye Tracking Technology in Aviation, Maritime, and Construction Industries: A Systematic Review. Sensors 2021, 21, 4289 .
AMA StyleDaniel Martinez-Marquez, Sravan Pingali, Kriengsak Panuwatwanich, Rodney Stewart, Sherif Mohamed. Application of Eye Tracking Technology in Aviation, Maritime, and Construction Industries: A Systematic Review. Sensors. 2021; 21 (13):4289.
Chicago/Turabian StyleDaniel Martinez-Marquez; Sravan Pingali; Kriengsak Panuwatwanich; Rodney Stewart; Sherif Mohamed. 2021. "Application of Eye Tracking Technology in Aviation, Maritime, and Construction Industries: A Systematic Review." Sensors 21, no. 13: 4289.
Australian housing affordability is influenced by both housing supply and demand factors. These factors include lengthy construction and planning process. The affordability crisis affects the housing rental sector, which accommodates more than 20 % of Australian household. This research developed a system dynamics model to simulate demography-linked affordable rental housing demand and supply in South East Queensland (SEQ). A Prefabricated Offsite Construction (OSC) housing supply strategy is compared with a traditional building approach (BAU) to investigate the effectiveness of OSC techniques to reduce informational asymmetries during development planning stages to deliver better affordable rental housing is linked to housing needs in SEQ. The model focuses on demographic groups housing demand of one, two- and three-bedroom apartment units and examines how reductions in the development process, through OSC methods, influence the efficiency of Government supported affordable rental housing supply schemes. Overall, the study finds that reduced planning and construction timeframes through OSC methods may improve demography-linked rental housing supply by approximately 6.6 % overall compared to BAU in SEQ. For 1,2- and 3-bedroom apartment demand, OSC strategies are expected to improve supply efficiency by 8.7 %, 8.4 % and 9.2 %, respectively. Optimal OSC strategies were assessed and found that flexibility in development sizes have an outsized positive effect. The study has implications for Government supported affordable rental housing strategies, including the build to rent sector.
Stefen MacAskill; Sherif Mostafa; Rodney A. Stewart; Oz Sahin; Emiliya Suprun. Offsite construction supply chain strategies for matching affordable rental housing demand: A system dynamics approach. Sustainable Cities and Society 2021, 73, 103093 .
AMA StyleStefen MacAskill, Sherif Mostafa, Rodney A. Stewart, Oz Sahin, Emiliya Suprun. Offsite construction supply chain strategies for matching affordable rental housing demand: A system dynamics approach. Sustainable Cities and Society. 2021; 73 ():103093.
Chicago/Turabian StyleStefen MacAskill; Sherif Mostafa; Rodney A. Stewart; Oz Sahin; Emiliya Suprun. 2021. "Offsite construction supply chain strategies for matching affordable rental housing demand: A system dynamics approach." Sustainable Cities and Society 73, no. : 103093.
Business cases often strain to identify enough benefits to cover costs of digital water metering (DWM), consisting of advanced metering infrastructure and data analytics. An Australian study in 2020 identified 77 benefits of DWM, potentially generating cost savings and customer satisfaction improvements. Modeling software makes projections of monetary savings over the DWM project life cycle and considers customer satisfaction improvements linked to DWM deployment. Leasing meters may provide lower entry costs, shifting risks to the supplier and avoiding lock-in of today's technology for long periods to achieve acceptable returns on investment.
Ian Monks; Rodney A. Stewart; Oz Sahin; Robert Keller. Building Compelling Business Cases for Digital Water Metering. Journal AWWA 2021, 113, 64 -75.
AMA StyleIan Monks, Rodney A. Stewart, Oz Sahin, Robert Keller. Building Compelling Business Cases for Digital Water Metering. Journal AWWA. 2021; 113 (5):64-75.
Chicago/Turabian StyleIan Monks; Rodney A. Stewart; Oz Sahin; Robert Keller. 2021. "Building Compelling Business Cases for Digital Water Metering." Journal AWWA 113, no. 5: 64-75.
Water security is an issue across the world as communities face ageing infrastructure, population increases and climate change. The application of digital water metering (DWM) to properties has had a demonstrable impact on water savings at the property and network levels, on efficiencies within water utilities, as well as on improvements to customer satisfaction scores. Gathering and processing near-real-time water usage data is very important for both end-users and utilities, as well as demand and supply management planning. The potential contribution of DWM to the three pillars of water sustainability (environmental, economic development and social equity) is often overlooked. In Australia and other jurisdictions water utilities are facing up to the challenge of climate change. However, business cases promoting DWM are often unsuccessful because the benefit side falls short of the cost side. This study sought to identify possible DWM benefits not previously considered through an extensive review of academic and industry literature, and then to view those benefits through the lens of sustainability. The 77 identified benefits of DWM were catalogued and a taxonomy was created. The study elicited the opinions of experts, before quantifying them, thus identifying two distinct contexts of benefit value; subsequently, it surveyed the views of customers and developed a stochastic model of benefit value. The model, named DWM360, was applied to the project data of a large metropolitan water utility in Australia to model their DWM proposal for cost savings, contribution to sustainability and uplift in customer satisfaction. This paper presents a novel focus on how the benefits of DWM assist water sustainability. It considers differing social norms that impact consumer acceptance of changes in metering and water charges. The study will be of interest to researchers as well as practitioners looking to identify sustainability aspects of DWM.
Ian Monks; Rodney A. Stewart; Oz Sahin; Robert J. Keller. Taxonomy and model for valuing the contribution of digital water meters to sustainability objectives. Journal of Environmental Management 2021, 293, 112846 .
AMA StyleIan Monks, Rodney A. Stewart, Oz Sahin, Robert J. Keller. Taxonomy and model for valuing the contribution of digital water meters to sustainability objectives. Journal of Environmental Management. 2021; 293 ():112846.
Chicago/Turabian StyleIan Monks; Rodney A. Stewart; Oz Sahin; Robert J. Keller. 2021. "Taxonomy and model for valuing the contribution of digital water meters to sustainability objectives." Journal of Environmental Management 293, no. : 112846.
Cross-departmental collaboration, one of the most salient administrative reforms, has been promoted to resolve cross-jurisdictional administration issues over the previous three decades. Nearly all previous empirical studies have examined the direct impact of cross-departmental collaboration on organizational performance without accounting for the indirect effects of managerial practices. Using data from the Federal Highway Administration, this study develops an integrated structural equation modeling and Bayesian network model used to examine both direct and indirect impacts of cross-departmental collaboration on organizational performance. The structural model indicates that cross-departmental collaboration has a direct effect on organizational performance and indirect effects through its influence on resource acquisition and knowledge creation. The scenario-based simulation suggests the optimal integration of managerial actions to improve agency performance, which is achieved by encouraging cross-departmental collaboration and supporting the knowledge creation process. Finally, implications are provided to present practical managerial actions from the Federal Highway Administration as an exemplar for other highway agencies.
Warit Wipulanusat; Jirapon Sunkpho; Rodney Stewart. Effect of Cross-Departmental Collaboration on Performance: Evidence from the Federal Highway Administration. Sustainability 2021, 13, 6024 .
AMA StyleWarit Wipulanusat, Jirapon Sunkpho, Rodney Stewart. Effect of Cross-Departmental Collaboration on Performance: Evidence from the Federal Highway Administration. Sustainability. 2021; 13 (11):6024.
Chicago/Turabian StyleWarit Wipulanusat; Jirapon Sunkpho; Rodney Stewart. 2021. "Effect of Cross-Departmental Collaboration on Performance: Evidence from the Federal Highway Administration." Sustainability 13, no. 11: 6024.
To meet rising energy demands, power plant operations will expand, influencing the interactions between the water–energy nexus and society. However, a major challenge is integration of social dimensions within electricity generation. To address this, we generate a baseline dataset using US public data (2014–2019) from the Energy Information Administration and US Bureau of Labor Statistics. We identify the rate of energy consumed, CO2, SO2 and NOx emissions generated, and water used per MWh net electricity as well as employee wellbeing per unit MW capacity during electricity generation. Rates of energy consumption (MMBtu/MWh) decreased 4.9%, but water consumption and withdrawal (m3/MWh) both increased 0.93% and 0.31%, respectively. Emissions of CO2, SO2 and NOx decreased 22.64%, 75% and 25% MT/MWh, respectively. Thermoelectric cooling withdrawal and consumption is led by natural gas (50.07%, 38.31%), coal (29.61%, 25.07%), and nuclear energies (13.55%, 18.99%). Electric power generation contributes 0.06 injuries–illnesses/TWh and 0.001 fatalities/TWh, of which fossil fuels contributed 70% and 15%, respectively. Fossil fuels led in average annual employment (0.02 employees/MW) with low cost salaries (USD 0.09/MW) likely due to high collective capacity, which is declining. Estimated rates in this study and framework will aid power industry transition and operational decision makers.
Gabriela Shirkey; Megan Belongeay; Susie Wu; Xiaoguang Ma; Hassan Tavakol; Annick Anctil; Sandra Marquette-Pyatt; Rodney Stewart; Parikith Sinha; Richard Corkish; Jiquan Chen; Ilke Celik. An Environmental and Societal Analysis of the US Electrical Energy Industry Based on the Water–Energy Nexus. Energies 2021, 14, 2633 .
AMA StyleGabriela Shirkey, Megan Belongeay, Susie Wu, Xiaoguang Ma, Hassan Tavakol, Annick Anctil, Sandra Marquette-Pyatt, Rodney Stewart, Parikith Sinha, Richard Corkish, Jiquan Chen, Ilke Celik. An Environmental and Societal Analysis of the US Electrical Energy Industry Based on the Water–Energy Nexus. Energies. 2021; 14 (9):2633.
Chicago/Turabian StyleGabriela Shirkey; Megan Belongeay; Susie Wu; Xiaoguang Ma; Hassan Tavakol; Annick Anctil; Sandra Marquette-Pyatt; Rodney Stewart; Parikith Sinha; Richard Corkish; Jiquan Chen; Ilke Celik. 2021. "An Environmental and Societal Analysis of the US Electrical Energy Industry Based on the Water–Energy Nexus." Energies 14, no. 9: 2633.
As rooftop solar photovoltaic (PV) adoption in Australia is exponentially growing in the past decade, there is a need to promote effective product stewardship for PV panels reaching their end-of-life (EoL). This paper presents the development of a System Dynamics (SD) model for managing EoL rooftop PV panels based on the circular economy concept. Four stages of the SD modelling process include problem scoping and variable identification, model conceptualisation, SD model development, and scenario analysis. Stakeholder engagement is central to this research as the system under study is underpinned by high uncertainties and limited data availability. Four socio-technical transition pathways examined in this study include market-driven growth, conservative development, shared responsibility, and disruptive change. The simulation results indicated an improvement of collection and recovery performance when a stringent product stewardship scheme is enabled and improvement of installers’ participation in the collection program. This study argued that a system of shared responsibility will be capable of balancing techno-economic motivations of stakeholders across the supply chain to participate in the recovery scheme, while being less disruptive to PV adoption. Under this scenario, a gradual change in regulatory requirements (e.g. recovery target and material recovery rate requirements) is introduced to allow a period of industry and market development.
Hengky K. Salim; Rodney A. Stewart; Oz Sahin; Michael Dudley. Dynamic modelling of Australian rooftop solar photovoltaic product stewardship transition. Waste Management 2021, 127, 18 -29.
AMA StyleHengky K. Salim, Rodney A. Stewart, Oz Sahin, Michael Dudley. Dynamic modelling of Australian rooftop solar photovoltaic product stewardship transition. Waste Management. 2021; 127 ():18-29.
Chicago/Turabian StyleHengky K. Salim; Rodney A. Stewart; Oz Sahin; Michael Dudley. 2021. "Dynamic modelling of Australian rooftop solar photovoltaic product stewardship transition." Waste Management 127, no. : 18-29.
Monitoring and understanding the dissolved organic matter (DOM) cycle in a drinking water reservoir is crucial to water authorities, since most water treatment practices aim to remove DOM to prevent the formation of potentially harmful disinfection by-products. A vertical profiling system (VPS) installed in reservoirs can continuously detect the fluorescent DOM (fDOM) and determine the fDOM transport process. Although the VPS can interprete fDOM concentrations, water treatment operators still collect and rely upon DOM datasets that are manually sampled throughout the year. A long-term historical database provides an opportunity to develop a three-dimensional fDOM prediction model. In the present study, we collected and analysed VPS and sampling data and developed and assessed an innovative coupled data-driven and process-based model. These models were able to forecast future fDOM in both temperate and extreme weather conditions. Modelling scenario analysis concluded that deeper layers of the reservoir as well as areas close to the riverine zone had higher fDOM concentrations than any other zones during storm events. Simulated fDOM can be a proxy for dissolved organic carbon concentration. The model also determined that inflow creeks were predominant fDOM sources during storm events and continuing winds transported the fDOM from bottom to surface water layers. This study has implications for reservoir and water treatment plant operators seeking to gain a better understanding of the DOM cycle in a reservoir and to more efficiently manage DOM removal.
Xinchen Wang; Hong Zhang; Edoardo Bertone; Rodney A. Stewart; Sara P. Hughes. Coupled data-driven and process-based model for fluorescent dissolved organic matter prediction in a shallow subtropical reservoir. Environmental Modelling & Software 2021, 141, 105053 .
AMA StyleXinchen Wang, Hong Zhang, Edoardo Bertone, Rodney A. Stewart, Sara P. Hughes. Coupled data-driven and process-based model for fluorescent dissolved organic matter prediction in a shallow subtropical reservoir. Environmental Modelling & Software. 2021; 141 ():105053.
Chicago/Turabian StyleXinchen Wang; Hong Zhang; Edoardo Bertone; Rodney A. Stewart; Sara P. Hughes. 2021. "Coupled data-driven and process-based model for fluorescent dissolved organic matter prediction in a shallow subtropical reservoir." Environmental Modelling & Software 141, no. : 105053.
This paper systematically reviewed system dynamics applications in water resource management with respect to spatial factors, research aims, modelling sub-systems and model calibration and validation methods. Decision-making context, consideration of climate change, scenarios or management measures were also examined. Results showed that the critical conceptual system dynamics model development phases are often neglected with only 40% of reviewed articles developing causal loop diagrams, and only three studies identifying system archetypes. Most reviewed publications applied scenario-based approaches (82%) to evaluate the effectiveness of management measures, whilst a minority of studies (1.8%) considered water management optimisation. Structure behaviour and behaviour-pattern tests (52%) were mostly applied to evaluate the validity of the model structure and accuracy of the behaviour's pattern, though model validation was not conducted in 12% of the studies. Finally, an integrated system dynamics modelling framework was proposed, exploring opportunities for integration of system dynamics with other modelling tools based on the strengths and limitations of system dynamics modelling; this framework can be used to enhance the simulation and optimisation for future water resource management and planning in the context of climate change and socio-economic development.
Thuc D. Phan; Edoardo Bertone; Rodney A. Stewart. Critical review of system dynamics modelling applications for water resources planning and management. Cleaner Environmental Systems 2021, 2, 100031 .
AMA StyleThuc D. Phan, Edoardo Bertone, Rodney A. Stewart. Critical review of system dynamics modelling applications for water resources planning and management. Cleaner Environmental Systems. 2021; 2 ():100031.
Chicago/Turabian StyleThuc D. Phan; Edoardo Bertone; Rodney A. Stewart. 2021. "Critical review of system dynamics modelling applications for water resources planning and management." Cleaner Environmental Systems 2, no. : 100031.
Advanced householder profiling using digital water metering data analytics has been acknowledged as a core strategy for promoting water conservation because of its ability to provide near real-time feedback to customers and instil long-term conservation behaviours. Customer profiling based on household water consumption data collected through digital water meters helps to identify the water consumption patterns and habits of customers. This study employed advanced customer profiling techniques adapted from the machine learning research domain to analyse high-resolution data collected from residential digital water meters. Data analytics techniques were applied on already disaggregated end-use water consumption data (e.g., shower and taps) for creating in-depth customer profiling at various intervals (e.g., 15, 30, and 60 min). The developed user profiling approach has some learning functionality as it can ascertain and accommodate changing behaviours of residential customers. The developed advanced user profiling technique was shown to be beneficial since it identified residential customer behaviours that were previously unseen. Furthermore, the technique can identify and address novel changes in behaviours, which is an important feature for promoting and sustaining long-term water conservation behaviours. The research has implications for researchers in data analytics and water demand management, and also for practitioners and government policy advisors seeking to conserve valuable potable-water resources.
Shamsur Rahim; Khoi Anh Nguyen; Rodney Anthony Stewart; Damien Giurco; Michael Blumenstein. Advanced household profiling using digital water meters. Journal of Environmental Management 2021, 288, 112377 .
AMA StyleShamsur Rahim, Khoi Anh Nguyen, Rodney Anthony Stewart, Damien Giurco, Michael Blumenstein. Advanced household profiling using digital water meters. Journal of Environmental Management. 2021; 288 ():112377.
Chicago/Turabian StyleShamsur Rahim; Khoi Anh Nguyen; Rodney Anthony Stewart; Damien Giurco; Michael Blumenstein. 2021. "Advanced household profiling using digital water meters." Journal of Environmental Management 288, no. : 112377.
In recent years, titanium dioxide (TiO2) has increasingly been used as an inorganic ultraviolet (UV) filter for sun protection. However, nano-TiO2 may also pose risks to the health of humans and the environment. Thus, to adequately assess its potential adverse effects, a comprehensive understanding of the behaviour and fate of TiO2 in different environments is crucial. Advances in analytical and modelling methods continue to improve researchers’ ability to quantify and determine the state of nano-TiO2 in various environments. However, due to the complexity of environmental and nanoparticle factors and their interplay, this remains a challenging and poorly resolved feat. This paper aims to provide a focused summary of key particle and environmental characteristics that influence the behaviour and fate of sunscreen-derived TiO2 in swimming pool water and natural aquatic environments and to review the current state-of-the-art of single particle inductively coupled plasma mass spectrometry (SP-ICP-MS) approaches to detect and characterise TiO2 nanoparticles in aqueous media. Furthermore, it critically analyses the capability of existing fate and transport models to predict environmental TiO2 levels. Four particle and environmental key factors that govern the fate and behaviour of TiO2 in aqueous environments are identified. A comparison of SP-ICP-MS studies reveals that it remains challenging to detect and characterise engineered TiO2 nanoparticles in various matrices and highlights the need for the development of new SP-ICP-MS pre-treatment and analysis approaches. This review shows that modelling studies are an essential addition to experimental studies, but they still lack in spatial and temporal resolution and mostly exclude surface transformation processes. Finally, this study identifies the use of Bayesian Network-based models as an underexplored but promising modelling tool to overcome data uncertainties and incorporates interconnected variables.
Simone Heilgeist; Ryo Sekine; Oz Sahin; Rodney Stewart. Finding Nano: Challenges Involved in Monitoring the Presence and Fate of Engineered Titanium Dioxide Nanoparticles in Aquatic Environments. Water 2021, 13, 734 .
AMA StyleSimone Heilgeist, Ryo Sekine, Oz Sahin, Rodney Stewart. Finding Nano: Challenges Involved in Monitoring the Presence and Fate of Engineered Titanium Dioxide Nanoparticles in Aquatic Environments. Water. 2021; 13 (5):734.
Chicago/Turabian StyleSimone Heilgeist; Ryo Sekine; Oz Sahin; Rodney Stewart. 2021. "Finding Nano: Challenges Involved in Monitoring the Presence and Fate of Engineered Titanium Dioxide Nanoparticles in Aquatic Environments." Water 13, no. 5: 734.
Coral reef ecosystems provide a broad spectrum of essential ecological, economic and cultural services for Small Island Developing State (SIDS) communities. However, coral reef communities are increasingly threatened by the adverse impacts of human activities at both global and local scales. This study aims to develop an integrated dynamic assessment framework to evaluate coral reef conditions under different adaptation and climate change scenarios, and their consequential economic impacts in the small island community of Port Resolution on Tanna Island in Vanuatu. Our assessment framework follows a sequential multilayered modelling approach that uses System Dynamics (SD) coupled with Bayesian Network (BN) modelling to deal with the complexity and dynamicity of socioeconomic and environmental systems, and impacts from trans-discipline variables. The BN incorporated existing data and expert knowledge to project the future conditions of coral reefs under different scenario settings, and to parametrise and quantify the SD model where the existing data and information was insufficient. The SD was then used to simulate the dynamic relationship between coral reef condition and the economic benefits derived from its ecosystem services under different climate change (i.e. RCPs) and management scenarios through to 2070. Our findings show that sustainable community-based conservation management strategies are key to preserving the flow of coral reef ecosystem services under RCP 2.6 and 6.0. Importantly, we demonstrate that the implementation of an integrated portfolio of management strategies better protects ecosystem services provided by coral reefs and maximises the total economic benefits achieved over the long-term despite a temporary and short-term economic loss due to high initial capital investments and income reduction due to fishing and tourism restrictions.
Mehdi Hafezi; Rodney A. Stewart; Oz Sahin; Alyssa L. Giffin; Brendan Mackey. Evaluating coral reef ecosystem services outcomes from climate change adaptation strategies using integrative system dynamics. Journal of Environmental Management 2021, 285, 112082 .
AMA StyleMehdi Hafezi, Rodney A. Stewart, Oz Sahin, Alyssa L. Giffin, Brendan Mackey. Evaluating coral reef ecosystem services outcomes from climate change adaptation strategies using integrative system dynamics. Journal of Environmental Management. 2021; 285 ():112082.
Chicago/Turabian StyleMehdi Hafezi; Rodney A. Stewart; Oz Sahin; Alyssa L. Giffin; Brendan Mackey. 2021. "Evaluating coral reef ecosystem services outcomes from climate change adaptation strategies using integrative system dynamics." Journal of Environmental Management 285, no. : 112082.
An environmental life cycle assessment (LCA) methodology was applied to compare the conventional SWRO desalination process to two contemporary low-pressure membrane desalination processes: an osmotic dilution desalination (ODD) and a mixing dilution desalination (MDD). The ODD process combines a forward osmosis (FO) membrane and a low-pressure RO membrane (LPRO) in a hybrid (FO-RO) configuration. The MDD process couples the ultrafiltration (UF) with LPRO in a hybrid UF-RO configuration. SimaPro™ was used to conduct the LCA study. CML environmental impact assessment method was used to evaluate 11 environmental impact categories. Results from LCIA reveal the strong dependency of environmental impacts on the clean in place (CIP) process in dilution desalination systems while the energy flow in the standalone RO shows almost similar levels of dependency of environmental impacts instead of CIP process. Overall, the ODD process with FO-RO hybrid membrane technology has the highest environmental impact. The normalised comparison LCIA indicates that standalone RO has the lowest total environmental impacts as the fossil fuel is considered as the main source of power generator. Compared to conventional SWRO, the MDD process coupled with hybrid UF-RO technology had a lowest contribution to global warming and ozone layer depletion but had higher impacts to marine and aquatic resource depletion. Scenarios substituting the conventional with renewable energy sources to power the water treatment options favoured the MDD process coupled with hybrid UF-RO technology and prove the hybrid UF-RO process as the most environmentally favourable comparing to the conventional SWRO and hybrid FO-RO.
Pirooz Pazouki; Hangyong Ray Lu; Ali El Hanandeh; Wahidul Biswas; Edoardo Bertone; Fernanda Helfer; Rodney A. Stewart. Comparative environmental life cycle assessment of alternative osmotic and mixing dilution desalination system configurations. Desalination 2021, 504, 114963 .
AMA StylePirooz Pazouki, Hangyong Ray Lu, Ali El Hanandeh, Wahidul Biswas, Edoardo Bertone, Fernanda Helfer, Rodney A. Stewart. Comparative environmental life cycle assessment of alternative osmotic and mixing dilution desalination system configurations. Desalination. 2021; 504 ():114963.
Chicago/Turabian StylePirooz Pazouki; Hangyong Ray Lu; Ali El Hanandeh; Wahidul Biswas; Edoardo Bertone; Fernanda Helfer; Rodney A. Stewart. 2021. "Comparative environmental life cycle assessment of alternative osmotic and mixing dilution desalination system configurations." Desalination 504, no. : 114963.
Increasing demand for metals used in clean energy technologies including electric vehicles has led to an increased demand in certain metals such as nickel, cobalt and manganese. This has in turn led to an expanding interest in deep‐seabed mining (DSM) of polymetallic nodule deposits that contain these exact metals. The main concerns about DSM relate to the incomplete information available about the environmental risks associated with seabed mineral extraction. Key uncertainties need to be systematically addressed to refine environmental impact predictions and establish effective mitigation measures. Adaptive management is an iterative process for reducing the uncertainty that can be applied by both mining companies and regulatory bodies. This Brief Commentary reviews the key opportunities and challenges to operationalising adaptive management in DSM projects and highlights the need for a framework to move from theory to practice. The discussion proposes a systems approach to adaptive management, which could help to guide the environmental management of deep‐sea mineral extraction. This article is protected by copyright. All rights reserved.
Jayden Hyman; Rodney A. Stewart; Oz Sahin. Adaptive Management of Deep‐Seabed Mining Projects: A Systems Approach. Integrated Environmental Assessment and Management 2021, 1 .
AMA StyleJayden Hyman, Rodney A. Stewart, Oz Sahin. Adaptive Management of Deep‐Seabed Mining Projects: A Systems Approach. Integrated Environmental Assessment and Management. 2021; ():1.
Chicago/Turabian StyleJayden Hyman; Rodney A. Stewart; Oz Sahin. 2021. "Adaptive Management of Deep‐Seabed Mining Projects: A Systems Approach." Integrated Environmental Assessment and Management , no. : 1.
Research into the benefits of digital water metering (DWM) identified many benefits that were previously unrevealed in the literature. Many benefits are tangible and more easily quantified. Others, like a possible change in customer satisfaction (CS), are not. The objective of this study was to quantify any potential changes to CS from switching from conventional meters to DWM. The findings of a questionnaire survey of 178 customers determined a current average-CS score of 5.8 (0 (low) to 10 (high) scale); positive shifts in CS levels to individual DWM benefits of between 0.4 and 3.0; and, we demonstrated a prototype CS change prediction model that DWM implementation would derive a long-term CS step-change. The developed survey measurement items will benefit water utilities seeking to ascertain the benefits of DWM. The study will be of interest to researchers and water industry practitioners measuring CS and those developing business cases for DWM projects.
Ian Robert Monks; Rodney A. Stewart; Oz Sahin; Robert J. Keller; Peter Prevos. Towards understanding the anticipated customer benefits of digital water metering. Urban Water Journal 2021, 18, 137 -150.
AMA StyleIan Robert Monks, Rodney A. Stewart, Oz Sahin, Robert J. Keller, Peter Prevos. Towards understanding the anticipated customer benefits of digital water metering. Urban Water Journal. 2021; 18 (3):137-150.
Chicago/Turabian StyleIan Robert Monks; Rodney A. Stewart; Oz Sahin; Robert J. Keller; Peter Prevos. 2021. "Towards understanding the anticipated customer benefits of digital water metering." Urban Water Journal 18, no. 3: 137-150.
A reliable simulation of the manganese cycle in water supply system is essential for timely and effective manganese treatment strategies. A data-driven model estimating manganese levels in the treated water was developed through a threshold-based approach using raw water and supernatant return manganese levels. This data-driven model and a three-dimensional manganese cycle model for the source reservoir were integrated to simulate the overall manganese variations from the lake to the treated water. A decision support system based on the developed data-driven model was established to allow operators to react to situations that could result in elevated levels of manganese in the treated water. Scenario analyses were completed to examine the manganese variations in the reservoir, raw water and treated water due to different precipitations and wind conditions and to allow the identification of optimal strategies for manganese management from the reservoir to the water supply system.
Fuxin Zhang; Hong Zhang; Edoardo Bertone; Rodney Stewart; Kelvin O’Halloran; Geoff Hamilton; Kathy Cinque. Integrated modelling and management of manganese for a conventional potable water treatment plant. Journal of Water Process Engineering 2020, 39, 101860 .
AMA StyleFuxin Zhang, Hong Zhang, Edoardo Bertone, Rodney Stewart, Kelvin O’Halloran, Geoff Hamilton, Kathy Cinque. Integrated modelling and management of manganese for a conventional potable water treatment plant. Journal of Water Process Engineering. 2020; 39 ():101860.
Chicago/Turabian StyleFuxin Zhang; Hong Zhang; Edoardo Bertone; Rodney Stewart; Kelvin O’Halloran; Geoff Hamilton; Kathy Cinque. 2020. "Integrated modelling and management of manganese for a conventional potable water treatment plant." Journal of Water Process Engineering 39, no. : 101860.
Additive manufacturing facilitates the design of porous metal implants with detailed internal architecture. A rationally designed porous structure can provide to biocompatible titanium alloys biomimetic mechanical and biological properties for bone regeneration. However, increased porosity results in decreased material strength. The porosity and pore sizes that are ideal for porous implants are still controversial in the literature, complicating the justification of a design decision. Recently, metallic porous biomaterials have been proposed for load-bearing applications beyond surface coatings. This recent science lacks standards, but the Quality by Design (QbD) system can assist the design process in a systematic way. This study used the QbD system to explore the Quality Target Product Profile and Ideal Quality Attributes of additively manufactured titanium porous scaffolds for bone regeneration with a biomimetic approach. For this purpose, a total of 807 experimental results extracted from 50 different studies were benchmarked against proposed target values based on bone properties, governmental regulations, and scientific research relevant to bone implants. The scaffold properties such as unit cell geometry, pore size, porosity, compressive strength, and fatigue strength were studied. The results of this study may help future research to effectively direct the design process under the QbD system.
Daniel Martinez-Marquez; Ylva Delmar; Shoujin Sun; Rodney A. Stewart. Exploring Macroporosity of Additively Manufactured Titanium Metamaterials for Bone Regeneration with Quality by Design: A Systematic Literature Review. Materials 2020, 13, 4794 .
AMA StyleDaniel Martinez-Marquez, Ylva Delmar, Shoujin Sun, Rodney A. Stewart. Exploring Macroporosity of Additively Manufactured Titanium Metamaterials for Bone Regeneration with Quality by Design: A Systematic Literature Review. Materials. 2020; 13 (21):4794.
Chicago/Turabian StyleDaniel Martinez-Marquez; Ylva Delmar; Shoujin Sun; Rodney A. Stewart. 2020. "Exploring Macroporosity of Additively Manufactured Titanium Metamaterials for Bone Regeneration with Quality by Design: A Systematic Literature Review." Materials 13, no. 21: 4794.
A comprehensive review was conducted to assess the current state of monitoring approaches for primary faecal indicator bacteria (FIB) E. coli and enterococci. Approaches were identified and examined in relation to their accuracy, ability to provide continuous data and instantaneous detection results, cost, environmental awareness regarding necessary reagent release or other pollution sources, in situ monitoring capability, and portability. Findings showed that several methods are precise and sophisticated but cannot be performed in real-time or remotely. This is mainly due to their laboratory testing requirements, such as lengthy sample preparations, the requirement for expensive reagents, and fluorescent tags. This study determined that portable fluorescence sensing, combined with advanced modelling methods to compensate readings for environmental interferences and false positives, can lay the foundations for a hybrid FIB sensing approach, allowing remote field deployment of a fleet of networked FIB sensors that can collect high-frequency data in near real-time. Such sensors will support proactive responses to sudden harmful faecal contamination events. A method is proposed to enable the development of the visioned FIB monitoring tool.
Kane L. Offenbaume; Edoardo Bertone; Rodney A. Stewart. Monitoring Approaches for Faecal Indicator Bacteria in Water: Visioning a Remote Real-Time Sensor for E. coli and Enterococci. Water 2020, 12, 2591 .
AMA StyleKane L. Offenbaume, Edoardo Bertone, Rodney A. Stewart. Monitoring Approaches for Faecal Indicator Bacteria in Water: Visioning a Remote Real-Time Sensor for E. coli and Enterococci. Water. 2020; 12 (9):2591.
Chicago/Turabian StyleKane L. Offenbaume; Edoardo Bertone; Rodney A. Stewart. 2020. "Monitoring Approaches for Faecal Indicator Bacteria in Water: Visioning a Remote Real-Time Sensor for E. coli and Enterococci." Water 12, no. 9: 2591.
A mobile monitoring station was developed to measure nitrate and physicochemical water quality parameters remotely, in real-time, and at very high frequencies (thirty minutes). Several calibration experiments were performed to validate the outputs of a real-time nutrient sensor, which can be affected by optical interferences such as turbidity, pH, temperature and salinity. Whilst most of these proved to play a minor role, a data-driven compensation model was developed to account for turbidity interferences. The reliability of real-time optical sensors has been questioned previously; however, this study has shown that following compensation, the readings can be more accurate than traditional laboratory-based equipment. In addition, significant benefits are offered by monitoring waterways at high frequencies, due to rapid changes in analyte concentrations over short time periods. This, combined with the versatility of the mobile station, provides opportunities for several beneficial monitoring applications, such as of fertiliser runoff in agricultural areas in rural regions, aquaculture runoff, and waterways in environmentally sensitive areas such as the Great Barrier Reef.
Martin Jason Luna Juncal; Timothy Skinner; Edoardo Bertone; Rodney A. Stewart. Development of a Real-Time, Mobile Nitrate Monitoring Station for High-Frequency Data Collection. Sustainability 2020, 12, 5780 .
AMA StyleMartin Jason Luna Juncal, Timothy Skinner, Edoardo Bertone, Rodney A. Stewart. Development of a Real-Time, Mobile Nitrate Monitoring Station for High-Frequency Data Collection. Sustainability. 2020; 12 (14):5780.
Chicago/Turabian StyleMartin Jason Luna Juncal; Timothy Skinner; Edoardo Bertone; Rodney A. Stewart. 2020. "Development of a Real-Time, Mobile Nitrate Monitoring Station for High-Frequency Data Collection." Sustainability 12, no. 14: 5780.