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Influence of moisture on coal apparent permeability and CO2 sequestration capacity: Coupled effects of hygroscopic swelling and water film
No full textMoisture is spread throughout the coal seams, significantly influencing coalbed methane extraction efficiency and CO2 sequestration capacity. However, existing research often neglects the impact of moisture on gas migration behavior. This study develops an apparent permeability evolution model for binary gases based on the three competing mechanisms of effective stress, gas-induced matrix strain and thermal swelling, and considering the dual role of water on fracture aperture. On this basis, the thermo-hydro-mechanical coupled gas mass transfer theory is constructed. The theory was utilized to obtain the relationship between gas-induced matrix strain and fracture water film thickness under varying water content conditions. And the mechanism of moisture’s role in characterizing the evolution of apparent permeability, CH4 recovery and CO2 storage is further discussed. Results indicate that moisture significantly suppresses the competitive adsorption behavior of binary gases within coal seams, leading to a notable reduction in matrix strain. Simultaneously, increased water content intensifies the development of water film along fracture walls. Additionally, through fixed-point monitoring method, it was elucidated that the apparent permeability of coalbeds showed a more obvious decreasing trend with the increase of water content, but the evolution of dramatic showed a significant decrease. Meanwhile, both CH4 recovery and CO2 cumulative storage capacities also exhibit a downward trajectory as water content levels increase. Inspired by these observations, the principles and advantages of intermittent pressurized CO2 injection are discussed, offering novel theoretical insights to support CO2 sequestration methods in deep, water-bearing coalbeds
Repurposing the Knutsford-1 borehole as a deep borehole heat exchanger with consideration of palaeoclimate corrections to heat flow in the Cheshire Basin
Get PDFSubsurface thermal data from UK boreholes typically lack palaeoclimatic corrections, leading to underestimations in heat flow. This can significantly affect predicted geothermal resources and system performance, creating a false perception of energy limitations. This study evaluates the impact of palaeoclimate corrections on geothermal performance in an onshore setting; focusing on the potential for a well to be re-entered and repurposed as a deep borehole heat exchanger (DBHE). Using the Knutsford-1 borehole, this re-evaluation for palaeoclimatic impacts on heat flow shows that corrected heat flows (52 mW/m2) exceed uncorrected values (46 mW/m2). In a steady state conductive model, temperature predictions based on the corrected heat flow align more closely to the recorded temperature data. Moreover, transient DBHE simulations using OpenGeoSys software over 25 years reveal a minimum 17 kW increase in thermal yield, highlighting the operational implications and benefits of these corrections. With thousands of legacy boreholes worldwide, integrating palaeoclimate corrections into geothermal assessments could reveal substantial untapped energy potential. By unlocking previously overlooked geothermal potential, this research highlights how accurate subsurface (re)assessments can transform legacy infrastructure into a cost-effective, sustainable energy source – demonstrating that with better data and a more holistic approach, existing wells can support low-carbon heat production
The book trade of Aberdeen and the North-East before the eighteenth century
No full textNo abstract available
Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos
Get PDFThis paper presents the expected sensitivity to the neutrino oscillation parameters of the Hyper-Kamiokande long-baseline program. The Hyper-Kamiokande experiment, currently under construction in Japan, will measure the oscillations of accelerator-produced neutrinos with thousands of selected events per sample: this corresponds to an increase of statistics of a factor 25–100 with respect to recent results from the currently-running long-baseline neutrino oscillation experiment in Japan, T2K. In the most favorable scenario we will achieve the discovery of Charge-Parity (CP) violation in neutrino oscillation at 5 σ C.L. in less than 3 years. With 10 years of data-taking, and assuming a neutrino : antineutrino beam running ratio of 1:3, a CP violation discovery at 5 σ C.L. is possible for more than 60% of the actual values of the CP-violating phase, δ CP . Moreover, we will measure δ CP with a precision ranging from 20 ∘ , in the case of maximal CP violation, to 6 ∘ , in the case of CP conservation. We aim to achieve a 0.5% resolution on the Δ m 32 2 parameter, and a resolution between 3% and 0.5% on the sin 2 θ 23 parameter, depending on its true value. These results are obtained by extending the analysis methods of T2K with dedicated tuning to take into account the Hyper-Kamiokande design: the larger far detector, the more powerful beam, the upgraded near detector ND280, and the planned additional Intermediate Water Cherenkov Detector
Haptic sound for trauma storytelling in a cinematic virtual reality poetic documentary – The Road to Yesterday
Get PDFCinematic Virtual Reality (CVR) documentaries offer new possibilities for narrating trauma, yet their narrative grammar remains underdeveloped. This article examines how haptic sound supports trauma storytelling in my autobiographical CVR practice, The Road to Yesterday (2025). Drawing on Marks's concept of haptic perception, I develop a haptic sound framework grounded in the materiality of sound, low-frequency resonance, spatialised ambience and vibration-based haptics to explore how haptic sound can evoke embodied access to traumatic memory beyond linguistic or cognitive representation. I further argue that, within the documentary context, animated re-enactment and sound design beyond realism do not replicate reality but constitute an inquiry into reality and trauma. These nonrepresentational strategies offer an aesthetic buffer that creates distance from forced identity substitution or overstating “experiencing the other,” thereby reducing the risk of improper witnessing. The Road to Yesterday positions the immersant as a proximate third-person witness, maintaining psychological autonomy while enabling ethical witnessing. The findings suggest that multisensory approaches, particularly haptic sound, may help mediate traumatic experience and open a potential therapeutic space. In contexts where mourning rituals are disrupted, such as pandemic-era bereavement, CVR can facilitate symbolic closure and sustain continuing bonds through sensory and imaginative engagement
Realising VCD for untwisted automorphism groups of RAAGs
Get PDFThe virtual cohomological dimension of Out(Fₙ ) is given precisely by the dimension of the spine of Culler–Vogtmann Outer space. However, the dimension of the spine of untwisted Outer space for a general right-angled Artin group AΓ does not necessarily match the virtual cohomological dimension vcd(U (AΓ)) of the untwisted subgroup U (AΓ ) ≤ Out(AΓ). Under certain graph-theoretic conditions, we perform an equivariant deformation retraction of this spine to produce a new contractible cube complex upon which U (AΓ) acts properly and cocompactly. Furthermore, we give conditions for when the dimension of this complex realises the virtual cohomological dimension of U (AΓ). We finish with two applications of our construction; in particular we show that the difference between the dimension of the untwisted spine and vcd(U (AΓ)) can be arbitrarily large
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