Hydrogen can act as an energy store to balance supply and demand in the renewable sector. storage subsurface porous media could deliver high capacities but volume of recoverable hydrogen is unknown. We imaged displacement capillary trapping by brine a Clashach sandstone core at 2–7 MPa pore fluid pressure using X-ray computed microtomography. saturation obtained during drainage numbers <10−7 was ∼50% independent pressure. recovery secondary imbibition number 2.4 × 10−6 systematically...

Additive manufacturing has been a breakthrough therapy for the pharmaceutical industry raising opportunities long-quested properties, such as controlled drug-delivery. The aim of this study was to explore geometrical capabilities selective laser sintering (SLS) by creating spiked (tapered-edged) drug-loaded specimens administration in colon. Poly(vinyl alcohol) (PVA) used binding material and loperamide hydrochloride incorporated active ingredient. Printing feasible without addition agent or...

Flexible polyurethane foam composites with enhanced stiffness and energy dissipation have been prepared via a facile layer-by-layer assembly approach.The composite foams consisted of naturally abundant nanoclay/chitosan multilayers (up to six) deposited onto the struts dip-coating.The were characterised using infrared spectroscopy, scanning electron microscopy, elemental mapping μ-CT scanning.Quasi-static mechanical compression 6 bilayers showed 202% increase in 33% enhancement damping loss...

Hydrogen can act as an energy store to balance supply and demand in the renewable sector. storage subsurface porous media could deliver high capacities but volume of recoverable hydrogen is unknown. We imaged displacement capillary trapping by brine a Clashach sandstone cylinder at 2-7 MPa pore fluid pressure using X-ray computed microtomography. saturation obtained during drainage numbers &lt;10-7 was ~50% independent injection pressure. Fluid configuration space indicative water wetting...

: Abstract The installation of displacement piles in chalk involves the crushing, remoulding and densifying material under pile tip. This remoulded forms an annulus around installed pile. Shaft friction can be expected to significantly affected by characteristics this annulus. However, research on its attributes mechanisms behind origin is scarce. paper explores use non-destructive 3D X-ray computed tomography (XCT) imaging determine changes bulk density associated with crushing during...

Gas bubble in aquatic sediments has a significant effect on its geophysical and geomechanical properties. Recent studies have shown that methane gas hydrate can coexist hydrate–bearing sediments. Accurate calibration understanding of the fundamental processes regarding such coexisting dynamics is essential for characterization hazard mitigation. We conducted high-resolution synchrotron imaging formation from water-saturated sand. While previous focused evolution, here we focus dynamics. used...

Low- and medium-density White Chalk often destructures during civil engineering works, forming a putty that exhibits problematic low strengths in the short term but may build-up strength with time. The underlying mechanisms control mechanical performance of material are not well understood. This paper explores prospect developing framework to characterise behaviour chalk putty. To this end, triaxial tests were carried out using low- reconstituted chalks produced by different methods. Using...

Penetration of open- and closed-ended model piles into intact chalk, a soft calcareous rock, was investigated using microfocus X-ray computed tomography (XCT). Three-dimensional images the specimens showed that crushed densified chalk in their path, creating annulus around shaft, region compressed destructured below tip, fractures across cemented regions specimen. Laser-diffraction particle-size analyses after exhumation limited difference with laboratory-remoulded which suggested thorough...

Methane (CH4) hydrate dissociation and CH4 release are potential geohazards currently investigated using X-ray computed tomography (XCT). Image segmentation is an important data processing step for this type of research. However, it often time consuming, computing resource-intensive, operator-dependent, tailored each XCT dataset due to differences in greyscale contrast. In paper, investigation carried out U-Nets, a class Convolutional Neural Network, segment synchrotron images CH4-bearing...

Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Science. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing an older version [v1]Go new versionU-Net Segmentation Methods Variable-Contrast XCT Images of Methane-Bearing SandAuthorsFernando JesusAlvarez-BorgesiDOliver N. F.KingiDB.NMadhusudhaniDThomasConnolleyiDMarkBashamSharif I.AhmediDSee...

Real-time 3D microstructure changes in prepreg laminates during curing was observed using widely available X-ray Computed Tomography (XCT) hardware at high temporal resolution (2 min) and spatial (25 µm voxel size). The methodology demonstrated a cylindrical convection oven with an internal diameter of 100 mm, heating rate 2°C/min, maximum operating temperature 135°C, integrated vacuum line. technique applied to three representative carbon fibre reinforced epoxy samples having flat, tapered...

The one-dimensional (1D) normal compression behaviour of low–medium density chalk is investigated by way high-pressure oedometer tests on intact and reconstituted specimens. Test results reveal that a single 1D line (NCL) exists for chalks within the assessed range, feature has not been reported previously. Laser diffraction particle-size analyses scanning electron microscopy indicate ‘uniqueness’ NCL may be associated with comparable grain shapes size distributions, to breakage. These...

: Abstract Small-displacement pile driving in chalk produces an annulus of crushed and remoulded putty-like material through which shaft friction is believed to be mobilised. Ultimate assumed a function the effective angle putty interface radial stress acting on shaft. The mechanisms that affect magnitude latter are not well understood. It hypothesised levels attained during mobilisation related change void ratio takes place as structured becomes installation. Therefore, general notion...

Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Other. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v2]U-Net Segmentation Methods Variable-Contrast XCT Images of Methane-Bearing Sand Using Small Training DatasetsAuthorsFernando JesusAlvarez-BorgesiDOliver N....

Neutron and X-ray computed tomography (NCT XCT, respectively) are imaging techniques that increasingly applied in geomechanics research. They used to non-destructively reveal different microstructural aspects of geomaterials: XCT is often observe/quantify differences density or porosity, while NCT reveals the presence distribution hydrogenous materials such as water. The correlated use for geotechnics research its infancy. To this date, very few experiments have been carried out combine both...

The process of constructing and backfilling a seabed trench disturbs the soil. properties this disturbed soil their variation with time are important for design pipelines cables. Recent research has examined trenched backfilled soils via laboratory testing, but limited field data exists to corroborate that work. This paper introduces new dataset in situ CPT testing investigate backfill properties, from two project locations North Sea. At each site series CPTs have been conducted within as...

&amp;lt;p&amp;gt;Zero carbon energy generation from renewable sources can reduce climate change by mitigating emissions. A major challenge of is the imbalance between supply and demand. To overcome imbalances, subsurface storage hydrogen in porous media&amp;lt;sub&amp;gt;&amp;lt;/sub&amp;gt;is suggested as a large-scale economic solution, yet its mechanisms are not fully understood. Important unknowns effect high migration potential small mobile molecule volume recoverable...

X-ray computed tomography (XCT) is regularly employed in geomechanics to non-destructively measure the solid and pore fractions of soil rock from reconstructed 3D images. With increasing availability high-resolution XCT imaging systems, researchers now seek microfabric parameters such as number area interparticle contacts, which can then be used inform behaviour modelling techniques. However, recent research has evidenced that conventional image processing methods consistently overestimate...