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Viscoplastic rimming flow instead a rotating cylinder
Get PDFA theoretical analysis is presented for the flow of a Herschel-Bulkley fluid around the inside surface of a rotating cylinder, at rotation speeds for which the fluid largely collects in a prominent pool in the lower part of the cylinder. The analysis, based on lubrication theory, predicts the steady states typically reached after a small number of rotations. The analysis is also modified to consider the drainage of the film around a stationary cylinder, which allows an exploration of the dynamics when a rotating drum is suddenly stopped. The predictions of the theory are compared with experiments in which a Carbopol suspension is rotated inside an acrylic drum
Utilising electrodermal activity sensor signals to quantify nociceptive response during movement activities
No full textObjective:
With an increasingly ageing population and osteoarthritis prevalence, the quantification of nociceptive signals responsible for painful movements and individual responses could lead to better treatment and monitoring solutions. Changes in electrodermal activity (EDA) can be detected via changes in skin conductance (SC) and measured using finger electrodes on a wearable sensor, providing objective information for increased physiological stress response.
Results:
To provide EDA response preliminary data, this was recorded with healthy volunteers on an array of activities while receiving a noxious stimulus. This provides a defined scenario that can be utilised as protocol feasibility testing. Raw signal extraction, processing and statistical analysis was performed using mean SC values on all participant data. The application of the stimuli resulted in a significant average increase (p < 0.05) in mean SC in four out of five activities with significant gender differences (p < 0.05) in SC and self-reported pain scores and large effect sizes. Though EDA parameters are a promising tool for nociceptive response indicators, limitations including motion artifact sensitivities and lack of previous movement-based EDA published data result in restricted analysis understanding. Refined processing pipelines with signal decomposition tools could be utilised in a protocol that quantifies nociceptive response clinically meaningfully
Littlewood and Duffin - Schaeffer-type problems in diophantine approximation
Get PDFGallagher’s theorem describes the multiplicative diophantine approximation
rate of a typical vector. We establish a fully inhomogeneous version of Gallagher’s theorem, a diophantine fibre refinement, and a sharp and unexpected threshold for Liouville fibres. Along the way, we prove an inhomogeneous version of the Duffin–Schaeffer conjecture for a class of nonmonotonic approximation functions
Canguilhem, Dumézil, Hyppolite : Georges Canguilhem and his Contemporaries
No full textIn the original preface to his primary doctoral thesis Folie et déraison, Michel Foucault thanked three men as intellectual mentors and influences on his work. In his inaugural lecture at the Collège de France in December 1970 the same three names were invoked: Georges Canguilhem, Georges Dumézil and Jean Hyppolite. The relation between these figures individually with Foucault has been discussed in varying degrees of detail, but this article explores the intellectual affinities and tensions between the three older men. Canguilhem and Hyppolite had been contemporaries at the École normale supérieure in the 1920s, then colleagues in Strasbourg, and perhaps most visibly they took part in a television interview mediated by Alain Badiou and Dina Dreyfus in 1965. While Dumézil and Hyppolite were colleagues at the Collège de France, they appear never to have discussed each other’s work. Nor does Dumézil discuss Canguilhem, but Canguilhem importantly discusses both Dumézil and Hyppolite. The focus here is on Canguilhem’s review of Foucault’s Les mots et les choses, in which he indicates the understated importance of Dumézil to that book; and a report of a largely unknown seminar from autumn 1970 when Foucault discussed Dumézil’s work and Canguilhem responded. The article then moves to Canguilhem’s engagement with Hyppolite’s work, especially in his analysis of “Hegel en France,” and the tributes he wrote to his friend and colleague following Hyppolite’s 1968 death. Exploring his reading of two of his great contemporaries helps to resituate Canguilhem within wider philosophical debates in the mid-20th century
Reforming corporate criminal liability in English law : lessons and experiences from Canada
No full textAssesses the options put forward by the Law Commission in 2022 for reforming the law on corporate criminal liability, identifies problems with the identification principle underpinning corporate criminal liability, compares the Canadian approach and argues that this would be the most appropriate model for English law to follow
From Realpolitik to Gefühlspolitik : strategically narrating the European Union at the national level
Get PDFStudies on European narratives predominantly focus on which narratives about the EU exist and which are more salient for political actors and audiences. The question remains as to how political actors can strategically utilize those EU narratives at a national level to justify their decision-making and further their objectives. We argue that to render narratives efficacious in convincing audiences of the appropriateness of political decisions, actors engage in Gefühlspolitik – emotional politics – rather than Realpolitik by strategically (re)constructing EU narratives and emphasizing their intersections with national narratives and collective memory to construct emotionally compelling stories and moral imperatives. Therefore, how EU narratives are utilized on a national level is more dependent on the national context and their affective appeal than on their actual content. We demonstrate our argument by looking at the case of the German government narrating the EU during the migration crisis. We show how the government anchored the European peace narrative in German collective memory to construct compelling moral imperatives that significantly narrowed the discursive space and let the German government’s policies appear as apolitical necessities without alternative
Compact lie groups and complex reductive groups
No full textWe show that the categories of compact Lie groups and complex reductive groups (not necessarily connected) are homotopy equivalent topological categories. In other words, the corresponding categories enriched in the homotopy category of topological spaces are equivalent. This can also be interpreted as an equivalence of infinity categories
Coping with information loss and the use of auxiliary sources of data : a report from the NISS Ingram Olkin forum series on unplanned clinical trial disruptions
Get PDFWhile the SARS-CoV-2 (COVID-19) pandemic has led to an impressive and unprecedented initiation of clinical research, it has also led to considerable disruption of clinical trials in other disease areas, with around 80% of non-COVID-19 trials stopped or interrupted during the pandemic. In many cases the disrupted trials will not have the planned statistical power necessary to yield interpretable results. This paper describes methods to compensate for the information loss arising from trial disruptions by incorporating additional information available from auxiliary data sources. The methods described include the use of auxiliary data on baseline and early outcome data available from the trial itself and frequentist and Bayesian approaches for the incorporation of information from external data sources. The methods are illustrated by application to the analysis of artificial data based on the Primary care pediatrics Learning Activity Nutrition (PLAN) study, a clinical trial assessing a diet and exercise intervention for overweight children, that was affected by the COVID-19 pandemic. We show how all of the methods proposed lead to an increase in precision relative to use of complete case data only
The future of decisions from experience : connecting real-world decision problems to cognitive processes
Get PDFIn many important real-world decision domains, such as finance, the environment, and health, behavior is strongly influenced by experience. Renewed interest in studying this influence led to important advancements in the understanding of these decisions from experience (DfE) in the last 20 years. Building on this literature, we suggest ways the standard experimental design should be extended to better approach important real-world DfE. These extensions include, for example, introducing more complex choice situations, delaying feedback, and including social interactions. When acting upon experiences in these richer and more complicated environments, extensive cognitive processes go into making a decision. Therefore, we argue for integrating cognitive processes more explicitly into experimental research in DfE. These cognitive processes include attention to and perception of numeric and nonnumeric experiences, the influence of episodic and semantic memory, and the mental models involved in learning processes. Understanding these basic cognitive processes can advance the modeling, understanding and prediction of DfE in the laboratory and in the real world. We highlight the potential of experimental research in DfE for theory integration across the behavioral, decision, and cognitive sciences. Furthermore, this research could lead to new methodology that better informs decision-making and policy interventions
An efficient post-quantum secure dynamic EPID signature scheme using lattice
No full textEnhanced Privacy ID (EPID) signatures can be viewed as a direct anonymous attestation mechanism with expanded revocation capabilities. When the device’s private key is unknown, the revocation manager can revoke a device based on its signatures. Making these systems post-quantum secure is of great importance due to its widespread application in real-world systems. Boneh et al. first propose two post-quantum EPID signature schemes based on symmetric primitives only. In this work, we propose an EPID signature scheme based on la ttices. To the best of our knowledge, our EPID signature scheme based on lattices is the first strong post-quantum variant of EPID signature scheme which achieves security based on the hardness of standard short integer solution (SIS) problem. Our construction employs an updatable Merkle tree accumulator which provides us the flexibility that our EPID signature scheme supports dynamically joining or revoking of any group members at any time. We provide an estimated efficiency comparison of our EPID signature with the existing similar schemes and we observe that our scheme is comparable with the existing schemes despite the usage of strong post-quantum variant and enjoying post-quantum security