ORCID Profile
0000-0001-9792-4143
Current Organisation
Australian National University
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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)
Petroleum and Reservoir Engineering | Resources Engineering and Extractive Metallurgy | Artificial Intelligence and Image Processing | Synchrotrons; Accelerators; Instruments and Techniques | Image Processing | Other Physical Sciences | Computational Fluid Dynamics | Petroleum And Reservoir Engineering | Fluid Physics | Condensed Matter Imaging | Topology And Manifolds | Condensed Matter Physics | Classical Physics | Applied Mathematics not elsewhere classified | Timber, Pulp and Paper | Complex Physical Systems | Instruments And Techniques | Image Processing | Statistical Mechanics, Physical Combinatorics and Mathematical Aspects of Condensed Matter | Functional Materials | Manufacturing Engineering | Manufacturing Processes and Technologies (excl. Textiles) | Carbon Sequestration Science | Composite and Hybrid Materials | Surfaces and Structural Properties of Condensed Matter | Classical and Physical Optics | Condensed Matter Physics—Structural Properties | Condensed Matter Characterisation Technique Development | Physical Sciences Not Elsewhere Classified
ANZSRC Socio-Economic Objective (SEO)
Oil and Gas Extraction | Oil and gas | Oil and Gas Exploration | Management of Greenhouse Gas Emissions from Electricity Generation | Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Soils not elsewhere classified | Medical instrumentation | Earth sciences | Physical sciences | Mathematical sciences | Scientific instrumentation | Fabricated Metal Products not elsewhere classified | Information Processing Services (incl. Data Entry and Capture) | Expanding Knowledge in the Earth Sciences | Wood, Wood Products and Paper not elsewhere classified | Scientific Instruments | Expanding Knowledge in the Information and Computing Sciences | Reconstituted products (e.g. chipboard, particle board) |
Related Links
Publications
Experimental Verification of Effect of Size on Drainage Capillary Pressure Computed from Digitized Tomographic Images
Publisher: Trans Tech Publications, Ltd.
Date: 02-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/JERA.1.1
Abstract: This paper presents comparisons between drainage capillary pressure curves computed directly from 3D micro-tomographic images (micro-CT) and laboratory measurements conducted on the same core s les. It is now possible to calculate a wide range of petrophysical and transport properties directly from micro-CT images or from equivalent network models extracted from these images. Capillary pressure is sensitive to rock microstructure and the comparisons presented are the first direct validation of image based computations. The measured data include centrifuge and mercury injection drainage capillary pressure for fired Berea, Bentheimer and Obernkirchner sandstones and unfired Mount Gambier carbonate. The measurements cover a wide range of porosities and permeabilities. The measurements were made on core s les with different diameters (2.5 cm, 1.5 cm, 1 cm and 0.5 cm) to assess the effect of up-scaling on capillary pressure measurements. The smallest diameter s les were also used to obtain the 3D micro-CT images. Good agreement was obtained between the experimental measurements and direct computations on 3D micro-CT images.
Liquid distribution and cohesion in wet granular assemblies beyond the capillary bridge regime
Publisher: IOP Publishing
Date: 12-11-2008
Characterizing saline uptake and salt distributions in porous limestone with neutron radiography and X-ray micro-tomography
Publisher: SAGE Publications
Date: 30-01-2013
Abstract: S les of Savonnières limestone subjected to repeated wetting–drying cycles were investigated by both neutron radiography and X-ray micro-tomography to collect information on saline uptake and salt precipitation. Capillary uptake of water, 1.4 molal sodium sulphate and 5.8 molal sodium chloride solution was visualized with neutron radiography. The liquid penetration coefficients and diffusivities were determined and are markedly lower for the salt solutions than for water, due to the higher surface tension and viscosity of salt solutions. Halite distributions were derived from neutron radiographs. Porosity analysis of X-ray tomographic datasets allowed quantifying thenardite distributions and porosity decrease due to salt crystallization.
Determination of Local Diffusion Coefficients and Their Directional Anisotropy in Shale, and Relations to Local Mineralogy and Organic Matter Content, From Dynamic Micro-CT Imaging and Microscopy
Publisher: American Association of Petroleum Geologists
Date: 2017
Three-dimensional analysis of cortical bone structure using X-ray micro-computed tomography
Publisher: Elsevier BV
Date: 08-2004
Invasion Percolation on Correlated and Elongated Lattices
Publisher: Springer Science and Business Media LLC
Date: 2001
Improving dynamic tomography, through maximum a posteriori estimation
Publisher: SPIE
Date: 11-09-2014
DOI: 10.1117/12.2061604
Geometric Alignment Of Cone-Beam Helical-Trajectory Micro-Tomography Data Using a PI-Line Difference Metric
Publisher: Oxford University Press (OUP)
Date: 08-2018
Improving spatial-resolution in high cone-angle micro-CT by source deblurring
Publisher: SPIE
Date: 11-09-2014
DOI: 10.1117/12.2062415
Invasion percolation with long-range correlations: First-order phase transition and nonuniversal scaling properties
Publisher: American Physical Society (APS)
Date: 05-2000
Abstract: We present the results of extensive Monte Carlo simulations of the invasion percolation model with trapping (TIP) with long-range correlations, a problem which is relevant to multiphase flow in field-scale porous media, such as oil reservoirs and groundwater aquifers, as well as flow in rock fractures. The correlations are generated by a fractional Brownian motion characterized by a Hurst exponent H. We employ a highly efficient algorithm for simulating TIP, and a novel method for identifying the backbone of TIP clusters. Both site and bond TIP are studied. Our study indicates that the backbone of bond TIP is loopless and completely different from that of site TIP. We obtain precise estimates for the fractal dimensions of the s le-spanning cluster (SSC), the minimal path, and the backbone of site and bond TIP, and analyze the size distribution of the trapped clusters, in order to identify all the possible universality classes of TIP with long-range correlations. For site TIP with H > 1/2 the SSC and its backbone are compact, indicating a first-order phase transition at the percolation threshold, while the minimal paths are essentially straigth lines. For H < 1/2 the SSC, its backbone, and the minimal paths are all fractal with fractal dimensions that depend on the Hurst exponent H. The fractal dimension of the loopless backbone for bond TIP is much less than that of site TIP for any H.
Impact of wettability alteration on 3D nonwetting phase trapping and transport
Publisher: Elsevier BV
Date: 03-2016
Nonuniversality of invasion percolation in two-dimensional systems
Publisher: American Physical Society (APS)
Date: 07-02-2002
Bound-vector solitary waves in isotropic nonlinear dispersive media
Publisher: The Optical Society
Date: 09-1993
DOI: 10.1364/OL.18.001406
Effect of Saturation and Image Resolution on Representative Elementary Volume and Topological Quantification: An Experimental Study on Bentheimer Sandstone Using Micro-CT
Publisher: Springer Science and Business Media LLC
Date: 04-2021
Stable topological spatial solitons in optical parametric oscillators
Publisher: The Optical Society
Date: 07-1997
DOI: 10.1364/OL.22.000970
Abstract: We predict that nearly resonant optical parametric oscillators support stable topological spatial solitons as a result of the interplay between diffraction and parametric lification due to chi((2)) nonlinearities. Robust soliton stripes are observed in two transverse dimensions. Their stability is ensured by the phase-sensitive nature of the underlying parametric process.
Bayesian approach to time-resolved tomography
Publisher: The Optical Society
Date: 24-07-2015
DOI: 10.1364/OE.23.020062
Domain walls of linear polarization in isotropic Kerr media
Publisher: Elsevier BV
Date: 09-1997
Assessment of bone ingrowth into porous biomaterials using MICRO-CT
Publisher: Elsevier BV
Date: 05-2007
DOI: 10.1016/J.BIOMATERIALS.2007.01.046
Abstract: The three-dimensional (3D) structure and architecture of biomaterial scaffolds play a critical role in bone formation as they affect the functionality of the tissue-engineered constructs. Assessment techniques for scaffold design and their efficacy in bone ingrowth studies require an ability to accurately quantify the 3D structure of the scaffold and an ability to visualize the bone regenerative processes within the scaffold structure. In this paper, a 3D micro-CT imaging and analysis study of bone ingrowth into tissue-engineered scaffold materials is described. Seven specimens are studied in this paper a set of three specimens with a cellular structure, varying pore size and implant material, and a set of four scaffolds with two different scaffold designs investigated at early (4 weeks) and late (12 weeks) explantation times. The difficulty in accurately phase separating the multiple phases within a scaffold undergoing bone regeneration is first highlighted. A sophisticated three-phase segmentation approach is implemented to develop high-quality phase separation with minimal artifacts. A number of structural characteristics and bone ingrowth characteristics of the scaffolds are quantitatively measured on the phase separated images. Porosity, pore size distributions, pore constriction sizes, and pore topology are measured on the original pore phase of the scaffold volumes. The distribution of bone ingrowth into the scaffold pore volume is also measured. For early explanted specimens we observe that bone ingrowth occurs primarily at the periphery of the scaffold with a constant decrease in bone mineralization into the scaffold volume. Pore size distributions defined by both the local pore geometry and by the largest accessible pore show distinctly different behavior. The accessible pore size is strongly correlated to bone ingrowth. In the specimens studied a strong enhancement of bone ingrowth is observed for pore diameters>100 microm. Little difference in bone ingrowth is measured with different scaffold design. This result illustrates the benefits of microtomography for analyzing the 3D structure of scaffolds and the resultant bone ingrowth.
Mapping permeability in low-resolution micro-CT images: A multiscale statistical approach
Publisher: American Geophysical Union (AGU)
Date: 06-2016
DOI: 10.1002/2015WR018454
Effect of network topology on relative permeability
Publisher: Springer Science and Business Media LLC
Date: 04-2004
A statistical analysis of the effects of pressure, temperature and salinity on contact angles in CO2 -brine-quartz systems
Publisher: Elsevier BV
Date: 11-2015
Efficiently engineering pore-scale processes: The role of force dominance and topology during nonwetting phase trapping in porous media
Publisher: Elsevier BV
Date: 05-2015
The effect of displacement rate on imbibition relative permeability and residual saturation
Publisher: Elsevier BV
Date: 06-2006
Morse theory and persistent homology for topological analysis of 3D images of complex materials
Publisher: IEEE
Date: 10-2014
Structure and deformation correlation of closed-cell aluminium foam subject to uniaxial compression (vol 60, pg 3604, 2012)
Publisher: Elsevier BV
Date: 09-2012
Simulation of mercury porosimetry on correlated grids: Evidence for extended correlated heterogeneity at the pore scale in rocks
Publisher: American Physical Society (APS)
Date: 12-1998
Pore-scale characterization of carbonates using x-ray microtomography
Publisher: Society of Petroleum Engineers (SPE)
Date: 15-12-2005
DOI: 10.2118/90368-PA
Abstract: A reservoir carbonate core plug has been imaged in 3D across a range of length scales using high resolution X-ray microtomography (μ-CT). Data from the original 40-mm diameter plug was obtained at the vug scale (42 μm resolution) and allows the size, shape and spatial distribution of the disconnected vuggy porosity, ϕvug = 3.5% to be measured. Within the imaged volume over 32,000 separate vugs are identified and a broad vug size distribution is measured. Higher resolution images, down to 1.1 μm resolution, on subsets of the plug exhibit interconnected porosity and allow one to measure characteristic, intergranular pore size. Pore scale structure and petrophysical properties (permeability, drainage capillary pressure, formation factor, and NMR response) are derived directly on the highest resolution tomographic dataset. We show that data over a range of porosity can be computed from a single plug fragment. Data for the carbonate core is compared to results derived from 3D images of clastic cores and strong differences noted. Computations of permeability are compared to conventional laboratory measurements on the same core material with good agreement. This demonstrates the feasibility of combining digitized images with numerical calculations to predict properties and derive cross-correlations for carbonate lithologies.
Devices written by colliding spatial solitons: a coupled mode theory approach
Publisher: Elsevier BV
Date: 10-1993
Time-Lapsed Visualization and Characterization of Shale Diffusion Properties Using 4D X-ray Microcomputed Tomography
Publisher: American Chemical Society (ACS)
Date: 02-01-2018
Remobilization of residual non-aqueous phase liquid in porous media by freeze - Thaw cycles
Publisher: American Chemical Society (ACS)
Date: 28-03-2011
DOI: 10.1021/ES200151G
Abstract: The pore-scale behavior of a nonaqueous phase liquid (NAPL) trapped as residual contamination in a porous medium, subject to freeze-thaw cycles, was investigated by X-ray microcomputed tomography. It is shown that freeze-thaw cycles cause significant NAPL remobilization in the direction of the freezing front, due to the rupture and transport of a significant proportion of (supposedly entrapped) larger multipore NAPL ganglia. Significant NAPL remains in place, however, due to substantial ganglion fragmentation into single- and subpore ganglia. The contraction of branched ganglia into more rounded forms, especially near the top surface, is also observed. Three freezing-induced mechanisms are proposed to explain the results. The findings have important implications for NAPL contamination in cold regions, and for the behavior of water-hydrocarbon systems on the Earth and other planets.
Theory and Algorithms for Constructing Discrete Morse Complexes from Grayscale Digital Images
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2011
Mapping forces in a 3D elastic assembly of grains
Publisher: Elsevier BV
Date: 2012
Polarization domain walls in diffractive or dispersive Kerr media
Publisher: The Optical Society
Date: 15-01-1994
DOI: 10.1364/OL.19.000096
An x-ray tomography facility for quantitative prediction of mechanical and transport properties in geological, biological and synthetic systems.
Publisher: SPIE
Date: 26-10-2004
DOI: 10.1117/12.559200
Linear iterative near-field phase retrieval (LIPR) for dual-energy x-ray imaging and material discrimination
Publisher: The Optical Society
Date: 26-10-2018
Extended modulational instability and new type of solitary wave in coupled nonlinear Schrödinger equations
Publisher: Elsevier BV
Date: 02-1994
Developing a virtual materials laboratory
Publisher: Elsevier BV
Date: 12-2007
Nonparaxiality stabilizes three-dimensional soliton beams in Kerr media
Publisher: The Optical Society
Date: 12-1998
DOI: 10.1364/OL.23.001820
Abstract: On the basis of simple physical arguments involving energy flows and power invariants, we show that nonparaxiality stabilizes (1+2D) soliton beams in Kerr media.
Elastic and flow properties of carbonate core derived from 3D X ray-CT images
Publisher: Society of Exploration Geophysicists
Date: 2008
DOI: 10.1190/1.3059394
3D mapping of deformation in an unconsolidated sand: A micro mechanical study
Publisher: Society of Exploration Geophysicists
Date: 09-2012
Imaged-based multiscale network modelling of microporosity in carbonates
Publisher: Geological Society of London
Date: 04-06-2015
DOI: 10.1144/SP406.9
Optimized x-ray source scanning trajectories for iterative reconstruction in high cone-angle tomography
Publisher: SPIE
Date: 04-10-2016
DOI: 10.1117/12.2238297
Virtual materials design: Properties of cellular solids derived from 3D tomographic images
Publisher: Wiley
Date: 04-2005
Three-dimensional imaging of multiphase flow in porous media
Publisher: Elsevier BV
Date: 08-2004
Standing localized modes in nonlinear lattices
Publisher: American Physical Society (APS)
Date: 10-1994
An adaptive volumetric flux boundary condition for lattice Boltzmann methods
Publisher: Elsevier BV
Date: 10-2020
Techniques for image enhancement and segmentation of tomographic images of porous materials
Publisher: Elsevier BV
Date: 08-2004
Polymeric foam properties derived from 3D images
Publisher: Elsevier BV
Date: 08-0002
Techniques in helical scanning, dynamic imaging and image segmentation for improved quantitative analysis with X-ray micro-CT
Publisher: Elsevier BV
Date: 04-2014
Collisions, steering, and guidance with spatial solitons
Publisher: The Optical Society
Date: 04-1993
DOI: 10.1364/OL.18.000482
Abstract: By colliding two self-guided beams (solitons), we generate one, two, three, four, or possibly more stable solitons for a broad class of nonlinear material that spans threshold to power-law nonlinearities. This reproduction is shown to depend critically on beam stability, on the standard waveguide parameter V, and on a scaled angular beam separation theta/theta(c). The beams can also annihilate one another or create a stable beam from two unstable beams. Beam steering is possible by differentially changing soliton power or phase. Also, the colliding solitons induce versatile optical devices for the switching and steering of small-signal beams.
Structure and deformation correlation of closed-cell aluminium foam subject to uniaxial compression
Publisher: Elsevier BV
Date: 05-2012
Discretization limits of lattice-Boltzmann methods for studying immiscible two-phase flow in porous media
Publisher: Wiley
Date: 27-02-2020
DOI: 10.1002/FLD.4822
Polarized dark solitons in isotropic Kerr media
Publisher: American Physical Society (APS)
Date: 04-1997
Spectral information from photon statistics in x-ray radiography and computed tomography
Publisher: American Physical Society (APS)
Date: 14-07-2022
Observations of nonwetting phase snap-off during drainage
Publisher: Elsevier BV
Date: 11-2018
Virtual core laboratory: Properties of reservoir rock derived from X-ray CT images
Publisher: Society of Exploration Geophysicists
Date: 2003
DOI: 10.1190/1.1817572
The elliptically polarized fundamental vector soliton of isotropic Kerr media
Publisher: Elsevier BV
Date: 10-1994
Bark water uptake through lenticels increases stem hydration and contributes to stem swelling
Publisher: Wiley
Date: 09-10-2023
DOI: 10.1111/PCE.14733
3D X-Ray Source Deblurring in High Cone-Angle Micro-CT
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2015
The effects of manufacturing parameters on geometrical and mechanical properties of copper foams produced by space holder technique
Publisher: Elsevier BV
Date: 2014
High-resolution helical cone-beam micro-CT with theoretically-exact reconstruction from experimental data
Publisher: Wiley
Date: 19-09-2011
DOI: 10.1118/1.3633900
Abstract: In this paper we show that optimization-based autofocus may be used to overcome the instabilities that have, until now, made high-resolution theoretically-exact tomographic reconstruction impractical. To our knowledge, this represents the first successful use of theoretically-exact reconstruction in helical micro computed tomography (micro-CT) imaging. We show that autofocus-corrected, theoretically-exact helical CT is a viable option for high-resolution micro-CT imaging at high cone-angles (∼50°). The elevated cone-angle enables better utilization of the available X-ray flux and therefore shorter image acquisition time than conventional micro-CT systems. By using the theoretically-exact Katsevich 1PI inversion formula, we are not restricted to a low-cone-angle regime we can in theory obtain artefact-free reconstructions from projection data acquired at arbitrary high cone-angles. However, this reconstruction method is sensitive to misalignments in the tomographic data, which result in geometric distortion and streaking artefacts. We use a parametric model to quantify the deviation between the actual acquisition trajectory and an ideal helix, and use an autofocus method to estimate the relevant parameters. We define optimal units for each parameter, and use these to ensure consistent alignment accuracy across different cone-angles and different magnification factors. The tomographic image is obtained from a set of virtual projections in which software correction for hardware misalignment has been applied. We make significant modifications to the autofocus method that allow this method to be used in helical micro-CT reconstruction, and show that these developments enable theoretically-exact reconstruction from experimental data using the Katsevich 1PI (K1PI) inversion formula. We further demonstrate how autofocus-corrected, theoretically-exact helical CT reduces the image acquisition time by an order of magnitude compared to conventional circular scan micro-CT. Autofocus-corrected, theoretically-exact cone-beam reconstruction is a viable option for reducing acquisition time in high-resolution micro-CT imaging. It also opens up the possibility of efficiently imaging long objects.
Foliar water uptake enables embolism removal in excised twigs of Avicennia marina
Publisher: Wiley
Date: 07-12-2023
DOI: 10.1111/NPH.18613
Abstract: Embolism refilling is thought to require relaxation of xylem tension, and it is unclear whether and how tall trees or plants growing in arid or saline soils recover from embolism. We tested whether foliar water uptake could enable embolism refilling in dehydrated twigs of the grey mangrove ( Avicennia marina ). Four dehydrated twigs were imaged by laboratory‐based micro‐computed tomography before and after wetting leaves. Emboli were observed in dehydrated stems and leaves. Embolism decreased with increasing distance from the cut end of stems, suggesting that stem emboli were caused by cutting. A significant ( P = 0.026) c . 80% reduction in the embolised area was observed in leaves between the start and the end of the experiment (29 ± 10 h after wetting). Embolus diameter was unaffected by wetting. Embolism refilling occurred slowly, in stems embolised by cutting and leaves embolised by cutting and/or dehydration. The lack of response of embolus diameter to wetting suggests that capillarity was not the main mechanism for refilling. Results show that excised twigs of A . marina are able to recover from embolism by absorption of atmospheric water and call for studies under natural conditions.
An auto-focus method for generating sharp 3D tomographic images
Publisher: SPIE
Date: 19-08-2010
DOI: 10.1117/12.860285
X-ray imaging and analysis techniques for quantifying pore-scale structure and processes in subsurface porous medium systems
Publisher: Elsevier BV
Date: 2013
PI-Line Difference for Alignment and Motion-Correction of Cone-Beam Helical-Trajectory Micro-Tomography Data
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2020
Bifurcation phenomena and multiple soliton-bound states in isotropic Kerr media
Publisher: American Physical Society (APS)
Date: 04-1994
Quantitative properties of complex porous materials calculated from X-ray mu CT images - art. no. 631811
Publisher: SPIE
Date: 31-08-2006
DOI: 10.1117/12.679205
Digital core analysis: Characterizing reservoir quality through thin sandstone layers in heterolithic rocks
Publisher: Elsevier BV
Date: 11-2020
Trapping thresholds in invasion percolation
Publisher: American Physical Society (APS)
Date: 21-11-2002
Direct and stochastic generation of network models from tomographic images; effect of topology on residual saturations
Publisher: Springer Science and Business Media LLC
Date: 2002
The correlation of pore morphology, interconnectivity and physical properties of 3D ceramic scaffolds with bone ingrowth
Publisher: Elsevier BV
Date: 03-2009
DOI: 10.1016/J.BIOMATERIALS.2008.10.056
Abstract: In the design of tissue engineering scaffolds, design parameters including pore size, shape and interconnectivity, mechanical properties and transport properties should be optimized to maximize successful inducement of bone ingrowth. In this paper we describe a 3D micro-CT and pore partitioning study to derive pore scale parameters including pore radius distribution, accessible radius, throat radius, and connectivity over the pore space of the tissue engineered constructs. These pore scale descriptors are correlated to bone ingrowth into the scaffolds. Quantitative and visual comparisons show a strong correlation between the local accessible pore radius and bone ingrowth for well connected s les a cutoff accessible pore radius of approximately 100 microM is observed for ingrowth. The elastic properties of different types of scaffolds are simulated and can be described by standard cellular solids theory: (E/E(0))=(rho/rho(s))(n). Hydraulic conductance and diffusive properties are calculated results are consistent with the concept of a threshold conductance for bone ingrowth. Simple simulations of local flow velocity and local shear stress show no correlation to in vivo bone ingrowth patterns. These results demonstrate a potential for 3D imaging and analysis to define relevant pore scale morphological and physical properties within scaffolds and to provide evidence for correlations between pore scale descriptors, physical properties and bone ingrowth.
Robust pore size analysis of filamentous networks from three-dimensional confocal microscopy
Publisher: Elsevier BV
Date: 12-2008
Iterative reconstruction optimisations for high angle cone-beam micro-CT
Publisher: SPIE
Date: 11-09-2014
DOI: 10.1117/12.2062450
Effect of network topology on two-phase imbibition relative permeability
Publisher: Springer Science and Business Media LLC
Date: 02-2007
Ground-truth verification of dynamic x-ray micro-tomography images of fluid displacement
Publisher: SPIE
Date: 17-10-2012
DOI: 10.1117/12.929410
Pore network modelling of two-phase flow in porous rock: The effect of correlated heterogeneity
Publisher: Elsevier BV
Date: 02-2001
Relative permeability from tomographic images; effect of correlated heterogeneity
Publisher: Elsevier BV
Date: 09-2003
Imaging of metallic foams using X-ray micro-CT
Publisher: Elsevier BV
Date: 07-2009
Tomographic image analysis and processing to simulate micro-petrophysical experiments
Publisher: SPIE
Date: 19-08-2010
DOI: 10.1117/12.860293
Fast high-resolution micro-CT with exact reconstruction methods
Publisher: SPIE
Date: 19-08-2010
DOI: 10.1117/12.860298
Dynamic tomography with a priori information
Publisher: The Optical Society
Date: 08-07-2011
DOI: 10.1364/AO.50.003685
Effect of fluid topology on residual nonwetting phase trapping: Implications for geologic CO2 sequestration
Publisher: Elsevier BV
Date: 12-2013
Dual-energy iterative reconstruction for material characterisation
Publisher: SPIE
Date: 11-09-2014
DOI: 10.1117/12.2062442
Geometrical frustration in amorphous and partially crystallized packings of spheres
Publisher: American Physical Society (APS)
Date: 02-10-2013
Techniques for high-fidelity X-ray micro-tomography of additively manufactured metal components
Publisher: Informa UK Limited
Date: 24-06-2020
International survey of COVID-19 management strategies
Publisher: Oxford University Press (OUP)
Date: 20-11-2020
Abstract: While in idual countries have gained considerable knowledge and experience in coronavirus disease of 2019 (COVID-19) management, an international, comparative perspective is lacking, particularly regarding the measures taken by different countries to tackle the pandemic. This paper elicits the views of health system staff, tapping into their personal expertise on how the pandemic was initially handled. From May to July 2020, we conducted a cross-sectional, online, purpose-designed survey comprising 70 items. Email lists of contacts provided by the International Society for Quality in Health Care, the Italian Network for Safety in Health Care and the Australian Institute of Health Innovation were used to access healthcare professionals and managers across the world. We snowballed the survey to in iduals and groups connected to these organizations. Key outcome measures were attitudes and information about institutional approaches taken media communication how acute hospitals were re-organized primary health organization personal protective equipment and staffing and training. A total of 1131 survey participants from 97 countries across the World Health Organization (WHO) regions responded to the survey. Responses were from all six WHO regions 57.9% were female and the majority had 10 or more years of experience in healthcare almost half (46.5%) were physicians and all other major clinical professional groups participated. As the pandemic progressed, most countries established an emergency task force, developed communication channels to citizens, organized health services to cope and put in place appropriate measures (e.g. pathways for COVID-19 patients, and testing, screening and tracing procedures). Some countries did this better than others. We found several significant differences between the WHO regions in how they are tackling the pandemic. For instance, while overall most respondents (71.4%) believed that there was an effective plan prior to the outbreak, this was only the case for 31.9% of respondents from the Pan American Health Organization compared with 90.7% of respondents from the South-East Asia Region (SEARO). Issues with swab testing (e.g. delay in communicating the swab outcome) were less frequently reported by respondents from SEARO and the Western Pacific Region compared with other regions. The world has progressed in its knowledge and sophistication in tackling the pandemic after early and often substantial obstacles were encountered. Most WHO regions have or are in the process of responding well, although some countries have not yet instituted widespread measures known to support mitigation, for ex le, effective swab testing and social control measures.
Rapidly converging multigrid reconstruction of cone-beam tomographic data
Publisher: SPIE
Date: 03-10-2016
DOI: 10.1117/12.2238267
Investigation of supercritical CO2 mass transfer in porous media using X-ray micro-computed tomography
Publisher: Elsevier BV
Date: 2023
Morphological clues to wet granular pilestability
Publisher: Springer Science and Business Media LLC
Date: 10-02-2008
DOI: 10.1038/NMAT2117
Abstract: When a granular material such as sand is mixed with a certain amount of liquid, the surface tension of the latter bestows considerable stiffness to the material, which enables, for ex le, sand castles to be sculpted. The geometry of the liquid interface within the granular pile is of extraordinary complexity and strongly varies with the liquid content. Surprisingly, the mechanical properties of the pile are largely independent of the amount of liquid over a wide range. We resolve this puzzle with the help of X-ray microtomography, showing that the remarkable insensitivity of the mechanical properties to the liquid content is due to the particular organization of the liquid in the pile into open structures. For spherical grains, a simple geometric rule is established, which relates the macroscopic properties to the internal liquid morphologies. We present evidence that this concept is also valid for systems with non-spherical grains. Hence, our results provide new insight towards understanding the complex physics of a large variety of wet granular systems including land slides, as well as mixing and agglomeration problems.
On the challenges of measuring interfacial characteristics of three-phase fluid flow with x-ray microtomography
Publisher: Wiley
Date: 19-01-2014
DOI: 10.1111/JMI.12106
Abstract: Synchrotron-based x-ray computed microtomography contributes high-resolution, three-dimensional observations to investigations of multiphase fluid transport in porous media. Pore-scale observations are valuable to the development and validation of new theory, as well as numerical models. Computed microtomography has been used previously to measure fluid content and interfacial areas in systems containing two fluids (air-water, oil-water) and to a limited extent to measure fluid content and entrapped fluid morphology in systems containing three fluids (air-oil-water). This study addresses challenges that arise when imaging three-phase flow in spreading systems. The first challenge is related to wettability alteration. Observations reported herein suggest that the wettability of solid surfaces changed over the course of a three-fluid phase flow experiment, a phenomenon that has not been observed in similar, previously conducted two-fluid phase experiments. Follow-up experiments showed that wettability alteration is significant when oil-solid contact is combined with x-ray exposure, and is not reversed with a conventional cleaning procedure. The second challenge arises in segmenting three-phase images, and thereby obtaining data from which various measures can be quantified with sufficient accuracy. Partial volume effects and blur often cause the grey-scale values of different fluids to overlap and appropriate steps must be taken to avoid ambiguity at phase boundaries. A comparison of images collected at standard resolution (10.6 microns voxel(-1) ) to those collected at a higher resolution (5.3 microns voxel(-1) ) showed that saturation measurements are within 5% of each other, but interfacial areas for three-phase systems may be underestimated at standard resolution by as much as 25%.
Considerations for high-magnification high-cone-angle helical micro-CT
Publisher: SPIE
Date: 17-10-2012
DOI: 10.1117/12.929304
Polarization instability, multistability and transverse localized structures in Kerr media
Publisher: Elsevier BV
Date: 08-1994
Local diffusion coefficient measurements in shale using dynamic micro-computed tomography
Publisher: Elsevier BV
Date: 11-2017
Coproduction of healthcare services—from concept to implementation
Publisher: Oxford University Press (OUP)
Date: 28-09-2023
Space-Filling X-Ray Source Trajectories for Efficient Scanning in Large-Angle Cone-Beam Computed Tomography
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 09-2018
Grain-based characterisation and acoustic wave propagation in a sand packing subject to triaxial compression
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4811995
Extending reference scan drift correction to high-magnification high-cone-angle tomography
Publisher: The Optical Society
Date: 15-12-2011
DOI: 10.1364/OL.36.004809
Bimodal counterpropagating spatial solitary-waves
Publisher: Elsevier BV
Date: 11-1993
Mono and di-substituted BODIPY with electron donating carbazole, thiophene, and 3,4-ethylenedioxythiophene units
Publisher: Elsevier BV
Date: 05-2018
Topological Persistence for Relating Microstructure and Capillary Fluid Trapping in Sandstones
Publisher: American Geophysical Union (AGU)
Date: 2019
DOI: 10.1029/2018WR022780
Abstract: Results from a series of two‐phase fluid flow experiments in Leopard, Berea, and Bentheimer sandstones are presented. Fluid configurations are characterized using laboratory‐based and synchrotron based 3‐D X‐ray computed tomography. All flow experiments are conducted under capillary‐dominated conditions. We conduct geometry‐topology analysis via persistent homology and compare this to standard topological and watershed‐partition‐based pore‐network statistics. Metrics identified as predictors of nonwetting fluid trapping are calculated from the different analytical methods and are compared to levels of trapping measured during drainage‐imbibition cycles in the experiments. Metrics calculated from pore networks (i.e., pore body‐throat aspect ratio and coordination number) and topological analysis (Euler characteristic) do not correlate well with trapping in these s les. In contrast, a new metric derived from the persistent homology analysis, which incorporates counts of topological features as well as their length scale and spatial distribution, correlates very well ( R 2 = 0.97) to trapping for all systems. This correlation encompasses a wide range of porous media and initial fluid configurations, and also applies to data sets of different imaging and image processing protocols.
Volume conservation of the intermediate phase in three-phase pore-network models
Publisher: Springer Science and Business Media LLC
Date: 05-2005
Correction of beam hardening artefacts in microtomography for samples imaged in containers
Publisher: SPIE
Date: 11-09-2014
DOI: 10.1117/12.2062393
Skeletonization and Partitioning of Digital Images Using Discrete Morse Theory
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2015
Imaging Mean Energy of X-ray Spectra through Intensity Variation in Radiographs with an Example Application to Beam Hardening Correction.
Publisher: Oxford University Press (OUP)
Date: 08-2018
Image processing of multiphase images obtained via X-ray microtomography: A review
Publisher: American Geophysical Union (AGU)
Date: 04-2014
DOI: 10.1002/2014WR015256
Micro-CT facility for imaging reservoir rocks at pore scales
Publisher: Society of Exploration Geophysicists
Date: 2003
DOI: 10.1190/1.1817625
Polarization-domain solitary waves of circular symmetry in Kerr media
Publisher: The Optical Society
Date: 15-06-1994
DOI: 10.1364/OL.19.000859
Abstract: We present a new class of dark circularly symmetric solitary wave in bulk, self-defocusing Kerr media. The waves comprise two orthogonally polarized fields mutually guiding each other and forming separate polarization domains. The stability of these new solutions and the dynamics of related structures are briefly investigated.
Multi-resolution radiograph alignment for motion correction in X-ray micro-tomography
Publisher: SPIE
Date: 03-10-2016
DOI: 10.1117/12.2238259
High cone-angle x-ray computed micro-tomography with 186 GigaVoxel datasets
Publisher: SPIE
Date: 04-10-2016
DOI: 10.1117/12.2238258
Cancelling soliton interaction in singlemode optical fibres
Publisher: Institution of Engineering and Technology (IET)
Date: 1993
DOI: 10.1049/EL:19930786
Reprojection Alignment for Trajectory Perturbation Estimation in Microtomography
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2018
X-ray micro-tomography applications of relevance to the petroleum industry
Publisher: AIP
Date: 2007
DOI: 10.1063/1.2723640
Invasion percolation: new algorithms and universality classes
Publisher: IOP Publishing
Date: 30-11-1999
Percolating length scales from topological persistence analysis of micro-CT images of porous materials
Publisher: American Geophysical Union (AGU)
Date: 2016
DOI: 10.1002/2015WR017937
Digital core analysis: Improved connectivity and permeability characterization of thin sandstone layers in heterolithic rocks
Publisher: Elsevier BV
Date: 10-2020
Digital rock physics: 3D imaging of core material and correlations to acoustic and flow properties
Publisher: Society of Exploration Geophysicists
Date: 2009
DOI: 10.1190/1.3064143
Linear elastic properties of granular rocks derived from Xray-CT images
Publisher: Society of Exploration Geophysicists
Date: 2007
DOI: 10.1190/1.2792823
Reliable automatic alignment of tomographic projection data by passive auto-focus
Publisher: Wiley
Date: 09-08-2011
DOI: 10.1118/1.3609096
Abstract: The authors present a robust algorithm that removes the blurring and double-edge artifacts in high-resolution computed tomography (CT) images that are caused by misaligned scanner components. This alleviates the time-consuming process of physically aligning hardware, which is of particular benefit if components are moved or swapped frequently. The proposed method uses the experimental data itself for calibration. A parameterized model of the scanner geometry is constructed and the parameters are varied until the sharpest 3D reconstruction is found. The concept is similar to passive auto-focus algorithms of digital optical instruments. The parameters are used to remap the projection data from the physical detector to a virtual aligned detector. This is followed by a standard reconstruction algorithm, namely the Feldk algorithm. Feldk et al. [J. Opt. Soc. Am. A 1, 612-619 (1984)]. An ex le implementation is given for a rabbit liver specimen that was collected with a circular trajectory. The optimal parameters were determined in less computation time than that for a full reconstruction. The ex le serves to demonstrate that (a) sharpness is an appropriate measure for projection alignment, (b) our parameterization is sufficient to characterize misalignments for cone-beam CT, and (c) the procedure determines parameter values with sufficient precision to remove the associated artifacts. The algorithm is fully tested and implemented for regular use at The Australian National University micro-CT facility for both circular and helical trajectories. It can in principle be applied to more general imaging geometries and modalities. It is as robust as manual alignment but more precise since we have quantified the effect of misalignment.
Vector soliton associated with polarization modulational instability in the normal-dispersion regime
Publisher: American Physical Society (APS)
Date: 04-1994
Dynamic Micro-CT Imaging of Diffusion in Unconventionals
Publisher: Society of Petroleum Engineers
Date: 2015
DOI: 10.2118/178617-MS
Bifurcations of the dark soliton and polarization domain walls in nonlinear dispersive media
Publisher: American Physical Society (APS)
Date: 05-1994
X-ray attenuation models to account for beam hardening in computed tomography
Publisher: Optica Publishing Group
Date: 07-10-2020
DOI: 10.1364/AO.402304
Abstract: We introduce a beam-hardening correction method for lab-based X-ray computed tomography (CT) by modifying existing iterative tomographic reconstruction algorithms. Our method simplifies the standard Alvarez–Macovski X-ray attenuation model [ Phys. Med. Biol. 21 , 733 ( 1976 ) ] and is compatible with conventional (i.e., single-spectrum) CT scans. The sole modification involves a polychromatic projection operation, which is equivalent to applying a weighting that more closely matches the attenuation of polychromatic X-rays. Practicality is a priority, so we only require information about the X-ray spectrum and some constants relating to material properties. No other changes to the experimental setup or the iterative algorithms are necessary. Using reconstructions of simulations and several large experimental datasets, we show that this method is able to remove or reduce cupping, streaking, and other artefacts from X-ray beam hardening and improve the self-consistency of projected attenuation in CT. When the assumptions made in the simplifications are valid, the reconstructed tomogram can even be quantitative.
Flow rate impacts on capillary pressure and interface curvature of connected and disconnected fluid phases during multiphase flow in sandstone
Publisher: Elsevier BV
Date: 09-2017
Analysis of 3D bone ingrowth into polymer scaffolds via micro-computed tomography imaging
Publisher: Elsevier BV
Date: 09-2004
Elastic and transport properties of cellular solids derived from three-dimensional tomographic images
Publisher: The Royal Society
Date: 18-04-2006
Abstract: We describe a three-dimensional imaging and analysis study of eight industrial cellular foam morphologies. The foam morphologies were generated by differing industrial processing methods. Tomograms are acquired on an X-ray micro-computed tomography facility at scales of approximately equal to at resolutions down to 7 μm. The image quality is sufficient in all cases to measure local structure and connectivity of the foamed material, and the field of view large enough to calculate a range of material properties. Phase separation into solid and porous components is straightforward. Three-dimensional structural characteristics are measured directly on the porous and solid phases of the images. A number of morphological parameters are obtained, including pore volume-to-surface-area ratio, connectivity, the pore and solid phase size distributions defined by maximal sphere openings and chord length measurements. We further calculate the pore size distribution associated with capillary pressure via simulating of mercury drainage on the digital images. The binarized microstructures are used as a basis for calculations of transport properties (fluid permeability, diffusivity and thermal conductivity) and elastic moduli. From the data, we generate property–porosity relationships for the range of foam morphologies imaged and quantitatively analyse the effects of porosity and microstructure on the resultant properties of the foams. We compare our numerical data to commonly used theoretical and empirical property–porosity relationships. For thermal conductivity, we find that the numerical results agree extremely well with an empirical expression based on experimental data of various foams. The upper Hashin–Shtrikman bound also provides an excellent prediction of the data across all densities. From simulation of the diffusivity, we can define the tortuosity of the pore space within the cellular solid. We find that different processing methods lead to strong variations in the tortuosity of the pore space of the foams. For elastic properties, our results show that for the Young modulus, E , both the differential effective medium theory and the classical correlation give a good correlation. Assuming a constant Poisson's ratio leads to reasonable agreement. The best correlation for is given by assuming a slight variation in as a linear function of porosity. The permeability of the foams varies over three orders of magnitude. Correlations for permeability based on the classical Kozeny–Carman equation lead to reasonable agreement, except at the lowest porosities. Permeability estimations based on mercury porosimetry give excellent agreement for all foams.
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