Asymptotic enumeration of incidence matrices

We discuss the problem of counting {\em incidence matrices}, i.e. zero-one matrices with no zero rows or columns. Using different approaches we give three different proofs for the leading asymptotics for the number of matrices with $n$ ones as $n\to\infty$. We also give refined results for the asymptotic number of $i\times j$ incidence matrices with $n$ ones.Comment: jpconf style files. Presented at the conference "Counting Complexity: An international workshop on statistical mechanics and combinatorics." In celebration of Prof. Tony Guttmann's 60th birthda

Whose problem? Disability narratives and available identities

In this article, the author demonstrates that contemporary cultural disability discourses offer few positive resources for people with impairments to draw upon in constructing positive personal and social identities. Examining the emergence of the Disability Arts Movement in Britain, consideration is given to alternative discourses developed by disabled people who have resisted the passive roles expected of them and developed a disability identity rooted in notions of power, respect and control. It is suggested that these alternative discourses provide an empowering rather than a disabling basis for community development and community arts practice and should be embraced by workers in these fields

Background Paper: How Should We Classify Civil Society?: A Review of Mainstream and Alternative Approaches

This brief analysis reviews mainstream classification schemes before introducing a proposal for classifying civil society actors by their orientation within political theories of civil society

Sensitivity of Black Phosphorus to O2 and Atmosphere Measured by Macroscopic Four-Point Probe

Scientific interest in black phosphorus, a two-dimensional semiconducting allotrope of phosphorus, has increased in the last few years, since it was shown in 2014 to have very good properties for fieldeffect transistors. Unfortunately, practical use of the material is delayed because of its tendency to degrade into a phosphoric oxide when left in air. In this thesis I present the effects of atmospheric air and pure oxygen on the transport properties of bulk black phosphorus with and without light exposure. For continuous measurements carried out by millimeter-scale four-point probe, we see no change in the resistance of bulk samples exposed to air and oxygen, with or without light. I argue that even though we see an intensity shift in the Raman spectroscopy data, indicating oxidation of the black phosphorus samples, our measured resistances remain constant because the surface layers are nearly negligible in four-point measurements of bulk crystals. I then show an estimation for the upper bound of the number of layers affected by degradation as probed by this method, with a maximum of 900 out of 660,000 total probed layers, or about 0.1%