A 21st century metropolitan green belt

The Metropolitan Green Belt (henceforth MGB) has been proposed since the late nineteenth century but was first realised in the 1930s, and expanded under Abercrombie’s 1944 Greater London Plan. After decades of growth the MGB measures 5,160 square kilometres and covers parts of 68 local districts and London boroughs. Local planning authorities do have the power to modify the MGB through ad hoc reviews, although only in ‘exceptional circumstances’. These can include a shortage of housing land (though this alone doesn’t guarantee that change will be permitted). An early reason for proposing a MGB was to give access to the countryside but later it was to physically constrain the growth of London. The current aims of the policy are set out in the National Planning Policy Framework (NPPF), which says that “The fundamental aim of Green Belt policy is to prevent urban sprawl by keeping land permanently open”. To do this it seeks to check unrestricted sprawl of large built up areas, keep neighbouring towns from merging, safeguard the countryside from encroachment, preserve the setting and special character of historic towns and promote urban regeneration by encouraging the recycling of derelict and other urban land. Despite the name, Green Belt is not an environmental designation — in fact Duncan Sandys, the minister responsible for its expansion in the 1950s, said Green Belt land did not have to be green or even particularly attractive, as its purpose was to stop urban development. However, government guidance suggests that after establishing a Green Belt, the local authority might want to improve public access, provide recreation opportunities or improve the appearance or quality of the land — but actual use or enjoyment of the Green Belt is clearly seen as an incidental benefit of the policy. In the post-war period there was a two-pronged approach to directing development in South East England: the MGB constrained the supply of land, and at the same time New Towns were created to house people dispersed from larger cities including London. This link between state planned constraint and development (and the cross regional approach), although never perfectly realised, has long since been broken

Queer Spiritual Spaces

Drawn from extensive, new and rich empirical research across the UK, Canada and USA, Queer Spiritual Spaces investigates the contemporary socio-cultural practices of belief, by those who have historically been, and continue to be, excluded or derided by mainstream religions and alternative spiritualities. As the first monograph to be directly informed by 'queer' subjectivities whilst dealing with divergent spiritualities on an international scale, this book explores the recently emerging innovative spaces and integrative practices of queer spiritualities. Its breadth of coverage and keen critical engagement mean it will serve as a theoretically fertile, comprehensive entry point for any scholar wishing to explore the queer spiritual spaces of the twenty-first century

On the characteristic connection of gwistor space

We give a brief presentation of gwistor space, which is a new concept from G_2 geometry. Then we compute the characteristic torsion T^c of the gwistor space of an oriented Riemannian 4-manifold with constant sectional curvature k and deduce the condition under which T^c is \nabla^c-parallel; this allows for the classification of the G_2 structure with torsion and the characteristic holonomy according to known references. The case with the Einstein base manifold is envisaged.Comment: Many changes since first version, including title; Central European Journal of Mathematics, 201

Rigid upper bounds for the angular momentum and centre of mass of non-singular asymptotically anti-de Sitter space-times

We prove upper bounds on angular momentum and centre of mass in terms of the Hamiltonian mass and cosmological constant for non-singular asymptotically anti-de Sitter initial data sets satisfying the dominant energy condition. We work in all space-dimensions larger than or equal to three, and allow a large class of asymptotic backgrounds, with spherical and non-spherical conformal infinities; in the latter case, a spin-structure compatibility condition is imposed. We give a large class of non-trivial examples saturating the inequality. We analyse exhaustively the borderline case in space-time dimension four: for spherical cross-sections of Scri, equality together with completeness occurs only in anti-de Sitter space-time. On the other hand, in the toroidal case, regular non-trivial initial data sets saturating the bound exist.Comment: improvements in the presentation; some statements correcte

Persistence with anti-tumour necrosis factor therapies in patients with psoriatic arthritis: observational study from the British Society of Rheumatology Biologics Register

Objectives. To evaluate the risk–benefit profile of anti-TNF therapies in PsA and to study the predictors of treatment response and disease remission [disease activity score (DAS)-28 < 2.6]. Methods. The study included PsA patients (n = 596) registered with the British Society for Rheumatology Biologics Register (BSRBR). Response was assessed using the European League against Rheumatism (EULAR) improvement criteria. Univariate and multivariate logistic regression models were developed to examine factors associated with EULAR response and disease remission using a range of covariates. Poisson regression was used to calculate incidence rate ratios (IRRs) for serious adverse events (SAEs) vs seronegative RA controls receiving DMARDs, adjusting for age, sex and baseline co-morbidity. Results. At baseline, the mean (s.d.) DAS-28 was 6.4 (5.6). Of the patients, 70.3% were EULAR responders at 12 months. At 6 months, older patients [adjusted odds ratio (OR) 0.97 per year; 95% CI 0.95, 0.99], females (adjusted OR 0.51; 95% CI 0.34, 0.78) and patients on corticosteroids (adjusted OR 0.45; 95% CI 0.28, 0.72) were less likely to achieve a EULAR response. Over 1776.2 person-years of follow-up (median 3.07 per person), the IRR of SAEs compared with controls was not increased (0.9; 95% CI 0.8, 1.3). Conclusions. Anti-TNF therapies have a good response rate in PsA, and have an adverse event profile similar to that seen in a control cohort of patients with seronegative arthritis receiving DMARD therapy

From hermitean clifford analysis to subelliptic dirac operators on odd dimensional spheres and other CR manifolds

We show that the two Dirac operators arising in Hermitian Clifford analysis are identical to standard differential operators arising in several complex variables. We also show that the maximal subgroup that preserves these operators are generated by translations, dilations and actions of the unitary n-group. So the operators are not invariant under Kelvin inversion. We also show that the Dirac operators constructed via two by two matrices in Hermitian Clifford analysis correspond to standard Dirac operators in euclidean space. In order to develop Hermitian Clifford analysis in a different direction we introduce a sub elliptic Dirac operator acting on sections of a bundle over odd dimensional spheres. The particular case of the three sphere is examined in detail. We conclude by indicating how this construction could extend to other CR manifolds.publishe

Dispersal distances and migration rates at the arctic treeline in Siberia – a genetic and simulation-based study

A strong temperature increase in the Arctic is expected to lead to latitudinal treeline shift. This tundra–taiga turnover would cause a positive vegetation–climate feedback due to albedo decrease. However, reliable estimates of tree migration rates are currently lacking due to the complex processes involved in forest establishment, which depend strongly on seed dispersal. We aim to fill this gap using LAVESI, an individual-based and spatially explicit Larix vegetation simulator. LAVESI was designed to simulate plots within homogeneous forests. Here, we improve the implementation of the seed dispersal function via field-based investigations. We inferred the effective seed dispersal distances of a typical open-forest stand on the southern Taymyr Peninsula (northern central Siberia) from genetic parentage analysis using eight nuclear microsatellite markers. The parentage analysis gives effective seed dispersal distances (median ∼10&thinsp;m) close to the seed parents. A comparison between simulated and observed effective seed dispersal distances reveals an overestimation of recruits close to the releasing tree and a shorter dispersal distance generally. We thus adapted our model and used the newly parameterised version to simulate south-to-north transects; a slow-moving treeline front was revealed. The colonisation of the tundra areas was assisted by occasional long-distance seed dispersal events beyond the treeline area. The treeline (∼1&thinsp;tree&thinsp;ha−1) advanced by ∼1.6&thinsp;m&thinsp;yr−1, whereas the forest line (∼100&thinsp;trees&thinsp;ha−1) advanced by only ∼0.6&thinsp;m&thinsp;yr−1. We conclude that the treeline in northern central Siberia currently lags behind the current strong warming and will continue to lag in the near future.</p