ORCID Profile
0000-0002-2659-9459
Current Organisations
Arizona State University
,
The Cyprus Institute
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Energy Generation, Conversion and Storage Engineering | Nanomaterials | Functional Materials | Nanotechnology not elsewhere classified | Nanotechnology | Mechanical Engineering | Numerical Modelling and Mechanical Characterisation
ANZSRC Socio-Economic Objective (SEO)
Hydrogen-based Energy Systems (incl. Internal Hydrogen Combustion Engines) | Solar-Thermal Energy | Hydrogen Storage | Expanding Knowledge in Technology |
Related Links
Publications
Application of a Compound Parabolic Concentrator to a Multi-Source High-Flux Solar Simulator
Publisher: OSA
Date: 2018
Optical Design of a Heliostat Field for a High-Temperature Receiver–Reactor
Publisher: OSA
Date: 2018
Modelling of solar thermochemical reaction systems
Publisher: Elsevier BV
Date: 11-2017
Thermochemical CO2 splitting performance of perovskite coated porous ceramics
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0RA02353A
Abstract: A representative volume of LCMA coated porous SiC showing a maximum of 23% shrinkage when subject to high-temperature CO 2 conversion redox reactions. This results in significant structural changes including a reduction in specific surface area.
Quantifying Catch Rates, Shark Abundance and Depredation Rate at a Spearfishing Competition on the Great Barrier Reef, Australia
Publisher: MDPI AG
Date: 18-10-2022
Abstract: We developed and applied a method to quantify spearfisher effort and catch, shark interactions and shark depredation in a boat-based recreational spearfishing competition in the Great Barrier Reef Marine Park in Queensland. Survey questions were designed to collect targeted quantitative data whilst minimising the survey burden of spearfishers. We provide the first known scientific study of shark depredation during a recreational spearfishing competition and the first scientific study of shark depredation in the Great Barrier Reef region. During the two-day spearfishing competition, nine vessels with a total of 33 spearfishers reported a catch of 144 fish for 115 h of effort (1.25 fish per hour). A subset of the catch comprised nine eligible species under competition rules, of which 47 pelagic fish were weighed. The largest fish captured was a 34.4 kg Sailfish (Istiophorus platypterus). The most common species captured and weighed was Spanish Mackerel (Scomberomorus commerson). The total weight of eligible fish was 332 kg and the average weight of each fish was 7.1 kg. During the two-day event, spearfishers functioned as citizen scientists and counted 358 sharks (115 h effort), averaging 3.11 sharks per hour. Grey Reef Sharks (Carcharhinus amblyrhynchos) comprised 64% of sightings. Nine speared fish were fully depredated by sharks as spearfishers attempted to retrieve their catch, which equates to a depredation rate of 5.9%. The depredated fish included four pelagic fish and five reef fish. The shark species responsible were Grey Reef Shark (C. amblyrhynchos) (66%), Bull Shark (Carcharhinus leucas) (11%), Whitetip Reef Shark (Triaenodon obesus) (11%) and Great Hammerhead (Sphyrna mokarran) (11%). There were spatial differences in fish catch, shark sightings and rates of depredation. We developed a report card that compared average catch of fish, sightings of sharks per hour and depredation rate by survey area, which assists recreational fishers and marine park managers to assess spatio-temporal changes. The participating spearfishers can be regarded as experienced (average 18 days a year for average 13.4 years). Sixty percent of interviewees perceived that shark numbers have increased in the past 10 years, 33% indicated no change and 7% indicated shark numbers had decreased. Total fuel use of all vessels was 2819 L and was equivalent to 6.48 tons of greenhouse gas emissions for the competition.
Gas–Solid Reactions: Theory, Experiments and Case Studies Relevant to Earth and Planetary Processes
Publisher: Mineralogical Society of America
Date: 11-2018
Cyclic oxygen exchange capacity of Ce-doped V2O5 materials for syngas production via high-temperature thermochemical-looping reforming of methane
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1RA02234B
Abstract: Cerium doping into the V 2 O 5 lattice forms a reversible V 2 O 3 /VO redox pair after sequential methane partial oxidation and CO 2 /H 2 O splitting reactions and produces syngas (H 2 , CO) with fast rates and high oxygen exchange capacity.
Mesoporous silica-encaged ultrafine ceria–nickel hydroxide nanocatalysts for solar thermochemical dry methane reforming
Publisher: AIP Publishing
Date: 04-04-2022
DOI: 10.1063/5.0082365
Abstract: Reforming of methane to produce synthesis gas for the Fischer–Tropsch process provides an alternative to fossil fuels. Silica-encaged ceria–nickel hydroxide catalysts were produced by an in situ synthesis method to obtain ultrafine bimetallic species dispersed evenly within the mesoporous silica matrix. Dry reforming and reduction-oxidation cycling was undertaken with the materials. Catalysts with high content of nickel showed good activity during dry reforming, with conversions rates close to equilibrium in equimolar conditions. Insignificant deactivation of the catalysts was observed over 5 h and 50 h of reaction at 900 °C. Syngas production via reduction–oxidation cycling was shown to be insignificant as compared to continuous catalytic reforming.
The effect of sodium dodecyl sulfate and dodecyltrimethylammonium chloride on the kinetics of CO2 hydrate formation in the presence of tetra-n-butyl ammonium bromide for carbon capture applications
Publisher: Elsevier BV
Date: 07-2021
Optics of solar central receiver systems: a review
Publisher: The Optical Society
Date: 19-05-2016
DOI: 10.1364/OE.24.00A985
Improving mechanical and life cycle environmental performances of recycled CFRP automotive component by fibre architecture preservation
Publisher: Elsevier BV
Date: 12-2023
Hydrogen as an energy vector
Publisher: Elsevier BV
Date: 03-2020
Electrospun Manganese-Based Perovskites as Efficient Oxygen Exchange Redox Materials for Improved Solar Thermochemical CO2 Splitting
Publisher: American Chemical Society (ACS)
Date: 07-03-2019
Structural Rearrangement in LSM Perovskites for Enhanced Syngas Production via Solar Thermochemical Redox Cycles
Publisher: American Chemical Society (ACS)
Date: 26-06-2020
An urban ecohydrological model to quantify the effect of vegetation on urban climate and hydrology (UT&C v1.0)
Publisher: Copernicus GmbH
Date: 31-01-2020
Abstract: Abstract. Increasing urbanization is likely to intensify the urban heat island effect, decrease outdoor thermal comfort, and enhance runoff generation in cities. Urban green spaces are often proposed as a mitigation strategy to counteract these adverse effects, and many recent developments of urban climate models focus on the inclusion of green and blue infrastructure to inform urban planning. However, many models still lack the ability to account for different plant types and oversimplify the interactions between the built environment, vegetation, and hydrology. In this study, we present an urban ecohydrological model, Urban Tethys-Chloris (UT& C), that combines principles of ecosystem modelling with an urban canopy scheme accounting for the biophysical and ecophysiological characteristics of roof vegetation, ground vegetation, and urban trees. UT& C is a fully coupled energy and water balance model that calculates 2 m air temperature, 2 m humidity, and surface temperatures based on the infinite urban canyon approach. It further calculates the urban hydrological fluxes in the absence of snow, including transpiration as a function of plant photosynthesis. Hence, UT& C accounts for the effects of different plant types on the urban climate and hydrology, as well as the effects of the urban environment on plant well-being and performance. UT& C performs well when compared against energy flux measurements of eddy-covariance towers located in three cities in different climates (Singapore, Melbourne, and Phoenix). A sensitivity analysis, performed as a proof of concept for the city of Singapore, shows a mean decrease in 2 m air temperature of 1.1 ∘C for fully grass-covered ground, 0.2 ∘C for high values of leaf area index (LAI), and 0.3 ∘C for high values of Vc,max (an expression of photosynthetic capacity). These reductions in temperature were combined with a simultaneous increase in relative humidity by 6.5 %, 2.1 %, and 1.6 %, for fully grass-covered ground, high values of LAI, and high values of Vc,max, respectively. Furthermore, the increase of pervious vegetated ground is able to significantly reduce surface runoff.
A method for in situ measurement of directional and spatial radiosity distributions from complex-shaped solar thermal receivers
Publisher: Elsevier BV
Date: 05-2020
On groundwater fluctuations, evapotranspiration, and understory removal in riparian corridors
Publisher: American Geophysical Union (AGU)
Date: 05-2009
DOI: 10.1029/2008WR007152
Experimental evaluation of an indirectly-irradiated packed-bed solar thermochemical reactor for calcination–carbonation chemical looping
Publisher: Elsevier BV
Date: 07-2023
Ecohydrologic role of solar radiation on landscape evolution
Publisher: American Geophysical Union (AGU)
Date: 02-2015
DOI: 10.1002/2014WR016169
Thermal transport and chemical conversion in single reacting sorbent particles
Publisher: Wiley
Date: 23-04-2021
DOI: 10.1002/AIC.17267
Abstract: The effects of particle size and carbon dioxide concentration on chemical conversion in engineered spherical particles undergoing calcium oxide looping are investigated. Particles are thermochemically cycled in a furnace under different carbon dioxide concentrations. Changes in composition due to chemical reactions are measured using thermogravimetric analysis. Gas composition at the furnace exit is evaluated with mass spectroscopy. A numerical model of thermal transport phenomena developed previously is adapted to match the physical system investigated in the present study. The model is used to elucidate effects of reacting medium characteristics on particle temperature and reaction extent. Experimental and numerical results show that (1) an increase in particle size results in a decrease in carbonation extent, and (2) the carbonation step consists of fast and slow reaction regimes. The reaction rates in the fast and slow carbonation regimes increase with increasing carbon dioxide concentration. The effect of carbon dioxide concentration and the distinction between the fast and slow regimes become more pronounced with increasing particle size.
Numerical modelling of radiation absorption in a novel multi-stage free-falling particle receiver
Publisher: Elsevier BV
Date: 2020
Optical and radiative characterisation of alumina–silica based ceramic materials for high-temperature solar thermal applications
Publisher: Elsevier BV
Date: 09-2021
High-efficiency Wavelength Tunable Monolayer LED with Hybrid Continuous-pulsed Injection
Publisher: Research Square Platform LLC
Date: 30-11-2020
DOI: 10.21203/RS.3.RS-110731/V1
Abstract: High-efficiency and wavelength-tunable light emitting diode (LED) devices will play an important role in future advanced optoelectronic systems. Traditional semiconductor LED devices typically have a fixed emission wavelength that is determined by the energy of the emission states. Here, we developed a novel high-efficiency and wavelength-tunable monolayer WS 2 LED device, which operates in the hybrid mode of continuous-pulsed injection. This hybrid injection enables highly enhanced emission efficiency ( 20 times) and the effective size of emission area ( 5 times) at room temperature. The emission wavelength of WS 2 monolayer LED device can be tuned over more than 40 nm by driving AC voltages, from exciton emission to trion emission, and further to defect emissions. The quantum efficiency of defect electroluminescence (EL) emission is measured to be more than 24.5 times larger than that from free exciton and trion EL emissions. The separate carrier injection in our LED also demonstrate advantage in allowing to visualize and distinguish defect species in real space. Those defects are assigned to be negatively charged defects. Our results open a new route to develop high-performance and wavelength-tunable LED devices for future advanced optoelectronic applications.
Design improvement of compact double-pipe heat exchangers equipped with tube-side helical insert and annulus-side helical strip: Hydrothermal and exergy analyses
Publisher: Elsevier BV
Date: 05-2021
Hierarchical learning of statistical regularities over multiple timescales of sound sequence processing: A dynamic causal modelling study
Publisher: Cold Spring Harbor Laboratory
Date: 13-09-2019
DOI: 10.1101/768846
Abstract: The nervous system is endowed with predictive capabilities, updating neural activity to reflect recent stimulus statistics in a manner which optimises processing of expected future states. This process has previously been formulated within a predictive coding framework, where sensory input is either “explained away” by accurate top-down predictions, or leads to a salient prediction error which triggers an update to the existing prediction when inaccurate. However, exactly how the brain optimises predictive processes in the stochastic and multi-faceted real-world environment remains unclear. Auditory evoked potentials have proven a useful measure of monitoring unsupervised learning of patterning in sound sequences through modulations of the mismatch negativity component which is associated with “change detection” and widely used as a proxy for indexing learnt regularities. Here we used dynamic causal modelling to analyse scalp-recorded auditory evoked potentials collected during presentation of sound sequences consisting of multiple, nested regularities and extend on previous observations of pattern learning restricted to the scalp level or based on single-outcome events. Patterns included the regular characteristics of the two tones presented, consistency in their relative probabilities as either common standard ( p = .875) or rare deviant ( p = .125), and the regular rate at which these tone probabilities alternated. Significant changes in connectivity reflecting a drop in the precision of prediction errors based on learnt patterns were observed at three points in the sound sequence, corresponding to the three hierarchical levels of nested regularities: (1) when an unexpected “deviant” sound was encountered (2) when the probabilities of the two tonal states altered and (3) when there was a change in rate at which probabilities in tonal state changed. These observations provide further evidence of simultaneous pattern learning over multiple timescales, reflected through changes in neural activity below the scalp. Our physical environment is comprised of regularities which give structure to our world. This consistency provides the basis for experiential learning, where we can increasingly master our interactions with our surroundings based on prior experience. This type of learning also guides how we sense and perceive the world. The sensory system is known to reduce responses to regular and predictable patterns of input, and conserve neural resources for processing input which is new and unexpected. Temporal pattern learning is particularly important for auditory processing, in disentangling overlapping sound streams and deciphering the information value of sound. For ex le, understanding human language requires an exquisite sensitivity to the rhythm and tempo of speech sounds. Here we elucidate the sensitivity of the auditory system to concurrent temporal patterning during a sound sequence consisting of nested patterns over three timescales. We used dynamic causal modelling to demonstrate that the auditory system monitors short, intermediate and longer-timescale patterns in sound simultaneously. We also show that these timescales are each represented by distinct connections between different brain areas. These findings support complex interactions between different areas of the brain as responsible for the ability to learn sophisticated patterns in sound even without conscious attention.
High-temperature optical and radiative properties of alumina–silica-based ceramic materials for solar thermal applications
Publisher: Elsevier BV
Date: 08-2022
Eco‐geomorphic implications of hillslope aspect: Inferences from analysis of landscape morphology in central New Mexico
Publisher: American Geophysical Union (AGU)
Date: 07-2008
DOI: 10.1029/2008GL034477
Thermodynamic Analyses of Fuel Production via Solar-Driven Non-stoichiometric Metal Oxide Redox Cycling. Part 1. Revisiting Flow and Equilibrium Assumptions
Publisher: American Chemical Society (ACS)
Date: 03-09-2018
Redox Performance of Ceria–Vanadia Mixed-Phase Reticulated Porous Ceramics for Solar Thermochemical Syngas Production
Publisher: American Chemical Society (ACS)
Date: 05-10-2021
Liquid fuel production via supercritical water gasification of algae: a role for solar heat integration?
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1SE01615F
Abstract: Algal biomass is an attractive feedstock for carbon-neutral fuel production due to high growth rates and its potential to be farmed in artificial ponds on non-arable land.
Performance of a novel cold thermal storage material in an emulated air conditioning system using different storage strategies
Publisher: Elsevier BV
Date: 08-2019
Thermodynamic Analyses of Fuel Production via Solar-Driven Non-stoichiometric Metal Oxide Redox Cycling. Part 2. Impact of Solid–Gas Flow Configurations and Active Material Composition on System-Level
Publisher: American Chemical Society (ACS)
Date: 03-09-2018
Contrasting precipitation seasonality influences evapotranspiration dynamics in water‐limited shrublands
Publisher: American Geophysical Union (AGU)
Date: 02-2016
DOI: 10.1002/2015JG003169
Optical analysis of a solar thermochemical system with a rotating tower reflector and a receiver–reactor array
Publisher: Optica Publishing Group
Date: 17-06-2020
DOI: 10.1364/OE.389924
Abstract: We propose a concept of a rotating tower reflector (TR) in a beam-down optical system to alternate concentrated solar irradiation of an array of solar receiver–reactors, realizing multi-step solar thermochemical redox cycles. Optical and radiative characteristics of the proposed system are explored analytically and numerically by Monte-Carlo ray-tracing simulations. We study the effects of the system geometrical and optical parameters on the optical and radiative performance. TR axis is required to be tilted for accommodating the receiver–reactor array, resulting in reduced optical efficiency. We demonstrate that the annual optical efficiency of a baseline system with the receiver–reactor located south of the tower decreases from 46% to 37% for the axis tilt angle of TR increasing from 2° to 20°. The optical analysis conducted in this study provides a general formulation to enable predictions of required gain of thermal-to-chemical efficiency of the receiver–reactor array for obtaining improved overall solar-to-chemical efficiency of the solar thermochemical plant.
Radiation Characteristics of a Particle Curtain in a Free-Falling Particle Solar Receiver
Publisher: American Society of Mechanical Engineers
Date: 09-07-2017
DOI: 10.1115/HT2017-5117
Abstract: Radiation absorption by a particle curtain formed in a solar free falling particle receiver is investigated using a Eulerian-Eulerian granular two-phase model to solve the two-dimensional mass and momentum equations (CFD). The radiative transfer equation is subsequently solved by the Monte-Carlo (MC) ray-tracing technique using the CFD results to quantify the radiation intensity through the particle curtain. The CFD and MC results provide reliable opacity predictions and are validated with the experimental results available in literature. The particle curtain was found to absorb the solar radiation efficiently for smaller particles at high flowrates due to higher particle volume fraction and increased radiation extinction. However, at low mass-flowrates the absorption efficiency decreases for small and large particles.
Thermodynamic Guiding Principles for Designing Nonstoichiometric Redox Materials for Solar Thermochemical Fuel Production: Ceria, Perovskites, and Beyond
Publisher: Wiley
Date: 24-03-2021
Abstract: Two‐step solar thermochemical water splitting is a promising pathway for renewable fuel production due to its potential for high thermal efficiency via full‐spectrum sunlight utilization. Such a promise critically relies on simultaneous innovation in the redox materials and the reactor systems. Most prior efforts on material design are focused on improving the fuel yield at lower reduction temperatures. However, developing materials with both high fuel output and efficiency remains a key challenge, requiring a rigorous understanding of the effects of material thermodynamic properties. Herein, a generic thermodynamic framework is described to decipher the material effects by studying both the state‐of‐the‐art and hypothetical materials within a counterflow reactor system. A global efficiency map is presented for redox materials, revealing inevitable tradeoffs among competing factors such as thermal losses, sweep gas and oxidizer demand, solid preheating, and reduction enthalpy. The choice of the most efficient material is closely linked to the system conditions. Ceria‐based materials outperform perovskites under most scenarios, and the optimal hypothetical materials tend to favor higher reduction enthalpies and entropies than existing materials. This work offers a valuable material design roadmap to identify solutions toward efficient solar fuel production.
Enhanced oxygen exchange capacity in nano-structured vanadia–ceria multi-phase oxygen carriers for solar thermal fuel production
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA06471K
Abstract: Developing an efficient redox material is a fundamental and crucial step in sustainable hydrocarbon fuel production via solar energy-driven thermochemical redox cycles.
High-Temperature Gas–Solid Reactions in Industrial Processes
Publisher: Mineralogical Society of America
Date: 11-2018
Highly efficient and durable solar thermal energy harvesting via scalable hierarchical coatings inspired by stony corals
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1EE03028K
Abstract: Stony coral morphology inspires ultra-stable sunlight absorber structure with highest reported absorptance for high-temperature solar thermal applications.
A sodium boiler and phase-change energy storage system
Publisher: AIP Publishing
Date: 2019
DOI: 10.1063/1.5117588
Numerical and experimental investigation of a novel multi-stage falling particle receiver
Publisher: AIP Publishing
Date: 2019
DOI: 10.1063/1.5117542
Earth-abundant transition metal oxides with extraordinary reversible oxygen exchange capacity for efficient thermochemical synthesis of solar fuels
Publisher: Elsevier BV
Date: 08-2018
Modelling of bubble growth and detachment in nucleate pool boiling
Publisher: Elsevier BV
Date: 03-2023
Climate Change Impacts on Net Ecosystem Productivity in a Subtropical Shrubland of Northwestern México
Publisher: American Geophysical Union (AGU)
Date: 02-2018
DOI: 10.1002/2017JG004361
Heat transfer in directly-irradiated high-temperature solid–gas flows laden with polydisperse particles
Publisher: Elsevier BV
Date: 10-2022
Radiative properties of non-stoichiometrically reduced Ceria
Publisher: OSA
Date: 2017
Coral-inspired hierarchical structures for sunlight harvesting
Publisher: Research Square Platform LLC
Date: 21-09-2021
DOI: 10.21203/RS.3.RS-919328/V1
Abstract: Concentrating solar thermal (CST) is an efficient renewable energy technology with low-cost thermal energy storage. CST relies on wide-spectrum solar thermal absorbers that must withstand high temperatures ( 700°C) for many years, but state-of-the-art coatings have poor optical stability. Here, we show that the largely overlooked macro-scale morphology is key to enhancing both optical resilience and light trapping. Inspired by stony-coral morphology, we developed a hierarchical coating with three tuneable length-scale morphologies: nano- (~ 120 nm), micro- (~ 3 µm) and macro-scales ( 50 µm). Our coating exhibits outstanding, stable solar-weighted absorptance of 97.75 ± 0.04% after ageing at 850°C for more than 2,000 hours. The scalability of our coating is demonstrated on a commercial solar thermal receiver, paving the way for more reliable high-performance solar thermal systems.
Lattice Expansion in Optimally Doped Manganese Oxide: An Effective Structural Parameter for Enhanced Thermochemical Water Splitting
Publisher: American Chemical Society (ACS)
Date: 20-09-2019
Techno-economic assessment of solid–gas thermochemical energy storage systems for solar thermal power applications
Publisher: Elsevier BV
Date: 04-2018
Contribución del estrato arbustivo a los flujos de agua y CO2 de un matorral subtropical en el Noroeste de México
Publisher: Instituto Mexicano de Tecnologia del Agua
Date: 09-2020
Spectral radiative properties of three-dimensionally ordered macroporous ceria particles
Publisher: Elsevier BV
Date: 08-2014
Mechanistic modelling of bubble growth in sodium pool boiling
Publisher: Elsevier BV
Date: 05-2023
Investigation of novel hydroxyapatite-doped CaO material for calcination-carbonation thermochemical energy storage
Publisher: Author(s)
Date: 2018
DOI: 10.1063/1.5067125
An urban ecohydrological model to quantify the effect of vegetation on urban climate and hydrology (UT&C v1.0)
Publisher: Copernicus GmbH
Date: 05-09-2019
DOI: 10.5194/GMD-2019-225
Abstract: Abstract. Increasing urbanization is likely to intensify the urban heat island effect, decrease outdoor thermal comfort and enhance runoff generation in cities. Urban green spaces are often proposed as a mitigation strategy to counteract these adverse effects and many recent developments of urban climate models focus on the inclusion of green and blue infrastructure to inform urban planning. However, many models still lack the ability to account for different plant types and oversimplify the interactions between the built environment, vegetation, and hydrology. In this study, we present an urban ecohydrological model, Urban Tethys-Chloris (UT& C), that combines principles of ecosystem modelling with an urban canopy scheme accounting for the biophysical and ecophysiological characteristics of roof vegetation, ground vegetation and urban trees. UT& C is a fully coupled energy and water balance model that calculates 2 m air temperature, 2 m humidity, and surface temperatures based on the infinite urban canyon approach. It further calculates all urban hydrological fluxes, including transpiration as a function of plant photosynthesis. Hence, UT& C accounts for the effects of different plant types on the urban climate and hydrology, as well as the effects of the urban environment on plant well-being and performance. UT& C performs well when compared against energy flux measurements of eddy covariance towers located in three cities in different climates (Singapore, Melbourne, Phoenix). A sensitivity analysis, performed as a proof of concept for the city of Singapore, shows a mean decrease in 2 m air temperature of 1.1 °C for fully grass covered ground, 0.2 °C for high values of leaf area index (LAI), and 0.3 °C for high values of Vc,max (an expression of photosynthetic activity). These reductions in temperature were combined with a simultaneous increase in relative humidity by 6.5 %, 2.1 %, and 1.6 %, for fully grass covered ground, high values of LAI, and high values of Vc,max, respectively. Furthermore, the increase of pervious vegetated ground is able to significantly reduce surface runoff. These results show that urban greening can lead to a decrease in urban air temperature and surface runoff, but this effect is limited in cities characterized by a hot, humid climate.
Efficient ceria nanostructures for enhanced solar fuel production via high-temperature thermochemical redox cycles
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA02187E
Abstract: The flame-made nanostructured agglomerates achieved ca. 200% higher syngas production rates and the highest redox capacity so far reported for ceria.
Development of ASTRI high-temperature solar receivers
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4984354
Optical alignment and radiative flux characterization of a multi-source high-flux solar simulator
Publisher: Elsevier BV
Date: 04-2022
Hydrothermal characteristics of fluid flow in a circular tube fitted with free rotating axial-turbine-type swirl generators: Design, swirl strength, and performance analyses
Publisher: Elsevier BV
Date: 03-2022
Concentration-Dependent Solar Thermochemical CO 2 /H 2 O Splitting Performance by Vanadia–Ceria Multiphase Metal Oxide Systems
Publisher: American Association for the Advancement of Science (AAAS)
Date: 2020
Abstract: The effects of V and Ce concentrations (each varying in the 0–100% range) in vanadia–ceria multiphase systems are investigated for synthesis gas production via thermochemical redox cycles of CO 2 and H 2 O splitting coupled to methane partial oxidation reactions. The oxidation of prepared oxygen carriers is performed by separate and sequential CO 2 and H 2 O splitting reactions. Structural and chemical analyses of the mixed-metal oxides revealed important information about the Ce and V interactions affecting their crystal phases and redox characteristics. Pure CeO 2 and pure V 2 O 5 are found to offer the lowest and highest oxygen exchange capacities and syngas production performance, respectively. The mixed-oxide systems provide a balanced performance: their oxygen exchange capacity is up to 5 times higher than that of pure CeO 2 while decreasing the extent of methane cracking. The addition of 25% V to CeO 2 results in an optimum mixture of CeO 2 and CeVO 4 for enhanced CO 2 and H 2 O splitting. At higher V concentrations, cyclic carbide formation and oxidation result in a syngas yield higher than that for pure CeO 2 .
Supplementary material to "An urban ecohydrological model to quantify the effect of vegetation on urban climate and hydrology (UT&C v1.0)"
Publisher: Copernicus GmbH
Date: 05-09-2019
Radiation Absorption in a Particle Curtain Exposed to Direct High-Flux Solar Irradiation
Publisher: ASME International
Date: 26-06-2018
DOI: 10.1115/1.4040290
Abstract: Radiation absorption is investigated in a particle curtain formed in a solar free-falling particle receiver. An Eulerian–Eulerian granular two-phase model is used to solve the two-dimensional mass and momentum equations by employing computational fluid dynamics (CFD) to find particle distribution in the curtain. The radiative transfer equation (RTE) is subsequently solved by the Monte Carlo (MC) ray-tracing technique to obtain the radiation intensity distribution in the particle curtain. The predicted opacity is validated with the experimental results reported in the literature for 280 and 697 μm sintered bauxite particles. The particle curtain is found to absorb the solar radiation most efficiently at flowrates upper-bounded at approximately 20 kg s−1 m−1. In comparison, 280 μm particles have higher average absorptance than 697 μm particles (due to higher radiation extinction characteristics) at similar particle flowrates. However, as the absorption of solar radiation becomes more efficient, nonuniform radiation absorption across the particle curtain and hydrodynamic instability in the receiver are more probable.
Ecohydrology of root zone water fluxes and soil development in complex semiarid rangelands
Publisher: Wiley
Date: 25-09-2006
DOI: 10.1002/HYP.6333
Effects of atmospheric teleconnections on seasonal precipitation in mountainous regions of the southwestern U.S.: A case study in northern New Mexico
Publisher: American Geophysical Union (AGU)
Date: 12-2005
DOI: 10.1029/2005GL023759
The implications of geology, soils, and vegetation on landscape morphology: Inferences from semi-arid basins with complex vegetation patterns in Central New Mexico, USA
Publisher: Elsevier BV
Date: 04-2010
Thermodynamic Analyses of Fuel Production Via Solar-Driven Ceria-Based Nonstoichiometric Redox Cycling: A Case Study of the Isothermal Membrane Reactor System
Publisher: ASME International
Date: 08-01-2019
DOI: 10.1115/1.4042228
Abstract: A thermodynamic model of an isothermal ceria-based membrane reactor system is developed for fuel production via solar-driven simultaneous reduction and oxidation reactions. Inert sweep gas is applied on the reduction side of the membrane. The model is based on conservation of mass, species, and energy along with the Gibbs criterion. The maximum thermodynamic solar-to-fuel efficiencies are determined by simultaneous multivariable optimization of operational parameters. The effects of gas heat recovery and reactor flow configurations are investigated. The results show that maximum efficiencies of 1.3% (3.2%) and 0.73% (2.0%) are attainable for water splitting (carbon dioxide splitting) under counter- and parallel-flow configurations, respectively, at an operating temperature of 1900 K and 95% gas heat recovery effectiveness. In addition, insights on potential efficiency improvement for the membrane reactor system are further suggested. The efficiencies reported are found to be much lower than those reported in literature. We demonstrate that the thermodynamic models reported elsewhere can violate the Gibbs criterion and, as a result, lead to unrealistically high efficiencies. The present work offers enhanced understanding of the counter-flow membrane reactor and provides more accurate upper efficiency limits for membrane reactor systems.
Friedman method kinetic analysis of CaO-based sorbent for high-temperature thermochemical energy storage
Publisher: Elsevier BV
Date: 06-2019
Effect of non-stoichiometry on optical, radiative, and thermal characteristics of ceria undergoing reduction
Publisher: The Optical Society
Date: 19-03-2018
DOI: 10.1364/OE.26.00A360
Evaluation of Nexrad Stage III Precipitation data over a semiarid region.
Publisher: Wiley
Date: 02-2006
Vegetation and terrain drivers of infiltration depth along a semiarid hillslope
Publisher: Elsevier BV
Date: 12-2018
DOI: 10.1016/J.SCITOTENV.2018.07.052
Abstract: An improved understanding of the drivers controlling infiltration patterns in semiarid regions is of key importance, as they have important implications for ecosystem productivity, retention of resources and the restoration of degraded areas. The infiltration depth variability (ΔInf) in vegetation patches at the hillslope scale can be driven by different factors along the hillslope. Here we investigate the effects of vegetation and terrain attributes under hypothesis that these attributes exert a major control in ΔInf within the patches. We characterise the ΔInf within vegetation patches at a semiarid hillslope located at the Jornada Experimental Range at dry antecedent conditions preceding two winter frontal rainfall events. We measured these events that are typical during winter conditions, and are characterised by low intensity (0.67 and 4.48 mm h
Amine infused hydrogel-based CO2 gas storage technology for CO2 hydrate-based cold thermal energy storage
Publisher: Elsevier BV
Date: 11-2021
Optical analysis of a multi-aperture solar central receiver system for high-temperature concentrating solar applications
Publisher: Optica Publishing Group
Date: 12-2020
DOI: 10.1364/OE.404867
Abstract: A multi-aperture solar central receiver system is optically analyzed for increasing the net power to the receiver in a wide temperature range of 600–1800 K. A model system comprises a tower, a multi-aperture receiver with compound parabolic concentrators, and heliostat sub-fields. Optical modeling is performed using in-house developed Monte-Carlo ray-tracing programs. The heliostat sub-field geometrical configuration, the number of receiver apertures and optical properties of reflective surfaces are varied in the parametric study. Increasing the number of apertures from one to four increases the maximum net receiver power from 116 MW to 332 MW. The use of more than four apertures results in only limited further gain of the net receiver power but significantly decreases the overall optical efficiency and the solar-to-thermal efficiency. The optimal temperature for the maximized annual solar-to-exergy efficiency is found in the range of 1100–1200 K. This optimal temperature decreases slightly with an increasing number of apertures.
Long-term thermal stability and failure mechanisms of Pyromark 2500 for high-temperature solar thermal receivers
Publisher: Elsevier BV
Date: 10-2022
Reflective optics for redirecting convergent radiative beams in concentrating solar applications
Publisher: Elsevier BV
Date: 10-2019
Related Organisations
Massachusetts Institute Of Technology
Location: United States of America
Related Funding Activities
Linkage Projects - Grant ID: LP200300577
Start Date: 09-2022
End Date: 09-2026
Amount: $654,642.00
Funder: Australian Research Council
View Funded ActivityLinkage Projects - Grant ID: LP170101239
Start Date: 02-2019
End Date: 12-2023
Amount: $440,000.00
Funder: Australian Research Council
View Funded Activity