Tunnel spectroscopy of localised electronic states in hexagonal boron nitride

Hexagonal boron nitride is a large band gap layered crystal, frequently incorporated in van der Waals heterostructures as an insulating or tunnel barrier. Localised states with energies within its band gap can emit visible light, relevant to applications in nanophotonics and quantum information processing. However, they also give rise to conducting channels, which can induce electrical breakdown when a large voltage is applied. Here we use gated tunnel transistors to study resonant electron tunnelling through the localised states in few atomic-layer boron nitride barriers sandwiched between two monolayer graphene electrodes. The measurements are used to determine the energy, linewidth, tunnelling transmission probability, and depth within the barrier of more than 50 distinct localised states. A three-step process of electron percolation through two spatially separated localised states is also investigated

The impact of ‘exile’ on thought: Plotinus, Derrida and Gnosticism

This article examines the impact of ‘exile’ – as an individual or collective experience – on how human experience is theorized. The relationship between ‘exile’ and thought is initially approached historically by looking at the period that Eric Dodds famously called the ‘age of anxiety’ in late antiquity, i.e. the period between the emperors Aurelius and Constantine. A particular interest is in the dynamics of ‘empire’ and the concomitant religious ferment as a context in which ‘exile’, both experientially and symbolically, appears to assume an overbearing significance. Plotinus’ narrative of emanation and epistrophe as well as a group of narratives often classified as ‘Gnosticism’ are juxtaposed as two radical examples of a wider spiritual trend at the time according to which ‘exile’ could be considered constitutive of human experience. By way of an historical analogy, the insights gained from this study of late antiquity are then used to guide an analysis of the current, ‘restless’ epoch, in which experiences of displacement and exile on a mass scale undermine traditional notions of belonging, thus reviving the gnostic vision of cosmic reality as an alien, exilic environment. The article concludes with a discussion of Jacques Derrida’s work as an example of contemporary gnosticism, in which a ‘metaphysics of exile’ is presented in the disguise of an ‘exile from metaphysics’

Polybius and the Date of the Battle of Panormus

Histor

Health impact assessment for the sustainable futures of Salford

Background: The Salford Health Investment for Tomorrow and the Local Improvement Finance Trust proposals for the comprehensive redevelopment of Salford Royal Hospital and the provision of four integrated primary health and social centres in the City of Salford are a response to the challenge of the NHS Plan to modernise delivery and service provision. The scale of the proposed developments will have a major effect on the quality of life in Salford. This health impact assessment was undertaken to determine how these proposals could be amended to ensure that the impacts are optimised so that potential benefits to Salford’s communities are realised to maximise their health and wellbeing. Method: This involved a comprehensive prospective health impact assessment and a series of interviews with key stakeholders, community organisations, and local people to identify and prioritise potential positive and negative impacts of the proposals. Results and conclusions: The assessment pointed to a wide range of positive and negative impacts that provided the basis of a set of recommendations, which were linked directly to the themes of the Salford Community Plan. These related to setting employment, education, and training opportunities to maximise health and wellbeing and improve quality of life for all communities in Salford within the framework of the plan. In presenting the findings of the health impact assessment and discussing the recommendations, the paper presents a unique approach in health impact assessment reporting by offering perspectives from the assessor and the project’s steering group

New product introduction in smaller manufacturing firms

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