The growth of faults and fracture networks in a mechanically evolving, mechanically stratified rock mass : a case study from Spireslack Surface Coal Mine, Scotland

Fault architecture and fracture network evolution (and resulting bulk hydraulic properties) are highly dependent on the mechanical properties of the rocks at the time the structures developed. This paper investigates the role of mechanical layering and pre-existing structures on the evolution of strike–slip faults and fracture networks. Detailed mapping of exceptionally well exposed fluvial–deltaic lithologies at Spireslack Surface Coal Mine, Scotland, reveals two phases of faulting with an initial sinistral and later dextral sense of shear with ongoing pre-faulting, syn-faulting, and post-faulting joint sets. We find fault zone internal structure depends on whether the fault is self-juxtaposing or cuts multiple lithologies, the presence of shale layers that promote bed-rotation and fault-core lens formation, and the orientation of joints and coal cleats at the time of faulting. During ongoing deformation, cementation of fractures is concentrated where the fracture network is most connected. This leads to the counter-intuitive result that the highest-fracture-density part of the network often has the lowest open fracture connectivity. To evaluate the final bulk hydraulic properties of a deformed rock mass, it is crucial to appreciate the relative timing of deformation events, concurrent or subsequent cementation, and the interlinked effects on overall network connectivity

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Using trained dogs and organic semi-conducting sensors to identify asymptomatic and mild SARS-CoV-2 infections: an observational study

Background A rapid, accurate, non-invasive diagnostic screen is needed to identify people with SARS-CoV-2 infection. We investigated whether organic semi-conducting (OSC) sensors and trained dogs could distinguish between people infected with asymptomatic or mild symptoms, and uninfected individuals, and the impact of screening at ports-of-entry. Methods Odour samples were collected from adults, and SARS-CoV-2 infection status confirmed using RT-PCR. OSC sensors captured the volatile organic compound (VOC) profile of odour samples. Trained dogs were tested in a double-blind trial to determine their ability to detect differences in VOCs between infected and uninfected individuals, with sensitivity and specificity as the primary outcome. Mathematical modelling was used to investigate the impact of bio-detection dogs for screening. Results About, 3921 adults were enrolled in the study and odour samples collected from 1097 SARS-CoV-2 infected and 2031 uninfected individuals. OSC sensors were able to distinguish between SARS-CoV-2 infected individuals and uninfected, with sensitivity from 98% (95% CI 95–100) to 100% and specificity from 99% (95% CI 97–100) to 100%. Six dogs were able to distinguish between samples with sensitivity ranging from 82% (95% CI 76–87) to 94% (95% CI 89–98) and specificity ranging from 76% (95% CI 70–82) to 92% (95% CI 88–96). Mathematical modelling suggests that dog screening plus a confirmatory PCR test could detect up to 89% of SARS-CoV-2 infections, averting up to 2.2 times as much transmission compared to isolation of symptomatic individuals only. Conclusions People infected with SARS-CoV-2, with asymptomatic or mild symptoms, have a distinct odour that can be identified by sensors and trained dogs with a high degree of accuracy. Odour-based diagnostics using sensors and/or dogs may prove a rapid and effective tool for screening large numbers of people

Transcending sovereignty : locating Indigenous peoples in transboundary water law

All people rely upon water for life. Indigenous peoples are especially vulnerable to water conflicts and yet lack recognition in international water law. This thesis adopts Critical Race Theory to examine the intersection between transboundary water law, the doctrine of sovereignty and the international law of Indigenous peoples. The methodology adopted in this thesis includes: (i) a deconstruction of the UN Watercourse Convention and the doctrine of sovereignty; (ii) a review of Indigenous perspectives on sovereignty; and (iii) a proposal for the reconstruction of transboundary water law in a manner that recognizes the internationally affirmed rights of Indigenous peoples. A deconstruction of the UN Watercourse Convention and related discourse reveals that state-centric approaches to transboundary water law fail to recognize Indigenous peoples’ international rights or the pivotal role that Indigenous peoples’ traditional knowledge might play in transcending conflict. Case examples are provided (Columbia River and Tsangpo-Brahmaputra River) that illustrate the vulnerability of Indigenous peoples in the face of state development agreements. The inequities that exist in international water law are rooted in the historical doctrine of sovereignty which has evolved to subordinate Indigenous peoples’ interests to state interests. Indigenous perspectives regarding sovereignty provide a counter-point to the dominant legal discourse and weave an alternate narrative that challenges the myth of objectivity and neutrality that surrounds the doctrine of sovereignty and international law generally. Once we recognize that sovereignty is a social construct, we can recognize our collective ability to reconstruct international laws in a manner that transcends the sovereign discourse and recognizes the rights of Indigenous peoples. Endorsement of the United Nations Declaration on the Rights of Indigenous Peoples (UNDRIP) is indicative of states’ commitment to recognize Indigenous peoples’ rights throughout the international legal system. This thesis concludes by offering a proposal for reconstructing transboundary water law through a return to ethics and coalition building. Future reform should be directed towards (a) articulating an international water ethic with the critical engagement of Indigenous peoples; and (b) ensuring that river basin organizations are established on every transboundary river in a manner consistent with this shared international water ethic.Law, Faculty ofGraduat