A Sea Change in Eta Carinae

Major stellar-wind emission features in the spectrum of Eta Car have recently decreased by factors of order 2 relative to the continuum. This is unprecedented in the modern observational record. The simplest, but unproven, explanation is a rapid decrease in the wind density.Comment: 11 pages, 3 figures, accepted for publication in ApJ

Permutations and foster problems: two puzzles or one?

How are permutation arguments for the inscrutability of reference to be formulated in the context of a Davidsonian truth-theoretic semantics? Davidson (1979) takes these arguments to establish that there are no grounds for favouring a reference scheme that assigns London to ‘Londres’, rather than one that assigns Sydney to that name. We shall see, however, that it is far from clear whether permutation arguments work when set out in the context of the kind of truth-theoretic semantics which Davidson favours. The principle required to make the argument work allows us to resurrect Foster problems against the Davidsonian position. The Foster problems and the permutation inscrutability problems stand or fall together: they are one puzzle, not two

1-Hyperreflexivity and Complete Hyperreflexivity

The subspaces and subalgebras of B(H) which are hyperreflexive with constant 1 are completely classified. It is shown that there are 1-hyperreflexive subspaces for which the complete hyperreflexivity constant is strictly greater than 1. The constants for \bC T \otimes B(H) are analyzed in detail.Comment: 41 page

Finitely Correlated Representations of Product Systems of C∗C^*-Correspondences over Nk\mathbb{N}^k

We study isometric representations of product systems of correspondences over the semigroup $\mathbb{N}^k$ which are minimal dilations of finite dimensional, fully coisometric representations. We show the existence of a unique minimal cyclic coinvariant subspace for all such representations. The compression of the representation to this subspace is shown to be complete unitary invariant. For a certain class of graph algebras the nonself-adjoint \textsc{wot}-closed algebra generated by these representations is shown to contain the projection onto the minimal cyclic coinvariant subspace. This class includes free semigroup algebras. This result extends to a class of higher-rank graph algebras which includes higher-rank graphs with a single vertex.Comment: 34 pages; Introduction extended; to appear in the Journal of Functional Analysi

Community Economic Development Initiative (CEDI) Programme Evaluation

Shotton Colliery Community Economic Development Initiative (CEDI) began in 2007. It is one of three CEDI areas funded through the Single Programme. CEDI builds on a previous County Durham-wide programme, Settlement Renewal Initiatives (SRIs), which ended in 2006. Shotton Colliery CEDI receives funding from One North East, the Neighbourhood Renewal Fund and the Shotton Investment Pot. The aim of CEDI is to improve the local economy in Shotton Colliery by designing projects to support local people and businesses. The emphasis is on removing barriers to employment, supporting skills and training, and stimulating business growth. CEDI’s outcomes are: 1. New economic activity contributing to diversification in the local economy; 2. Enhance the contribution made by the settlement to the local economy; 3. Reduced unemployment and worklessness; 4. Increased skill levels and educational attainment; 5. Improved access to employment through addressing multiple barriers such as poor health, childcare responsibilities and transport; 6. Increased economic opportunities through enhancing the built and natural environment. CEDI outcomes are organised into four themes: community enterprise; reducing worklessness; education, training and skills, and business support and stimulating entrepreneurship. Projects to achieve the outcomes include the development of community enterprises such as a community café, increasing the range of leisure, welfare and learning opportunities offered by the community centre, improved broadband access for the area, and initiatives to support unemployed people and encourage business growth. Shotton Partnership 2000 Ltd oversees the CEDI along with partner agencies including Shotton Parish Council and Easington District Council. It commissioned this independent evaluation in November 2007. The evaluation had the following objectives: to consider the effectiveness of the delivery of Shotton CEDI against the outputs and outcomes included in the project’s approval; to examine the particular circumstances that exist in Shotton and which may have impacted on the delivery of CEDI; and to recommend potential activities and outcomes that would be of benefit to the community of Shotton and match the aspirations of those supporting the initiative in its continuation

Wiki use that increases communication and collarboration motivation

Communication and collaboration can be readily enabled by the use of many ICT tools. Wikis are one such platform that provides the opportunity for students to work on group projects without the barriers that arise from traditional group work. Whilst wiki use is becoming more common, its use in education is patchy and pedagogical reasoning and evaluation of such use is under explored. This paper addresses the gap in pedagogy and evaluation in the context of accounting studies. A traditional assessment task of writing an essay that involved a research and knowledge component was redesigned to enable groups to communicate and collaborate at a distance using a wiki. Through participant observation and student reflections of the group project, a wiki was found to be an effective platform to communicate and collaborate on a group project and enabled different barriers to be broken down. Wikis provide ubiquitous access to group work, organisation and version control, levels the playing field for dominant and shy students, and provides transparency for non-performers and high achievers.Robyn Davidso

Realism, modernism, and the spectre of Trotsky, part 2: Greenberg

No abstract available

In perspective: Tom Nairn

The 1960s saw an upsurge of separatist nationalisms at the core of the capitalist system, with the movements in Catalonia, Eskudai, Occitania, Quebec, Scotland, Wallonia and Wales all making their first serious impact during that decade. Nationalist demands went on to play a role-—although by no means the most important role--in the social upheavals which shook the capitalist system between 1968 and 1976. And although none of them succeeded in establishing new states, several--Catalonia, Quebec and, more recently, Scotland--gained a significant degree of formal autonomy within the state framework of the dominant nation. These events inspired a number of important studies of nationalism, the majority of which appeared in two clusters. The first appeared between 1977 and 1982 and the second between 1989 and 1992, following a further and, in terms of establishing new states, more successful revival of nationalist aspiration in Eastern Europe. Whatever criticisms might be levelled at these works the best have nevertheless helped to advance our understanding of the phenomenon in important, if partial, ways. Only a minority of these studies approached the question from an avowedly Marxist perspective. One of them was by the Scottish writer Tom Nairn, who is regarded by many as the foremost modern theoretician of the subject

My career in molecular biology

Norman Davidson's training as a physical chemist led him to make key early contributions to the chemistry of DNA. He described the details of DNA denaturation and renaturation, concepts that still form the basis for understanding hybridization. He also applied the single-molecule resolution of the electron microscope to describing the chemistry of circular DNA, mapping specific genes, and characterizing heteroduplexes. The latter became a dominant tool for the study of nucleic acids and contributed to our knowledge of transcription, polyadenylation, and retroviral structure. The advent of cDNA cloning and restriction enzymes enabled Davidson to describe the diversity of Drosophila actin genes and to isolate the gene encoding cAMP phosphodiesterase. Davidson then turned his attention to neuroscience and participated in cDNA cloning, oocyte expression, and structure-function studies of nicotinic acetylcholine receptors, voltage-gated sodium channels, a GABA transporter, a G protein-gated potassium channel, and calcium channels. His interests also extended to synaptic plasticity, and he helped to define the role of neuronal nitric oxide synthase and of trkB receptors. His final experiments concerned the role of protein kinase A in long-term potentiation. (The abstract was written posthumously by a colleague.