Equation of state and phonon frequency calculations of diamond at high pressures

The pressure-volume relationship and the zone-center optical phonon frequency of cubic diamond at pressures up to 600 GPa have been calculated based on Density Functional Theory within the Local Density Approximation and the Generalized Gradient Approximation. Three different approaches, viz. a pseudopotential method applied in the basis of plane waves, an all-electron method relying on Augmented Plane Waves plus Local Orbitals, and an intermediate approach implemented in the basis of Projector Augmented Waves have been used. All these methods and approximations yield consistent results for the pressure derivative of the bulk modulus and the volume dependence of the mode Grueneisen parameter of diamond. The results are at variance with recent precise measurements up to 140 GPa. Possible implications for the experimental pressure determination based on the ruby luminescence method are discussed.Comment: 10 pages, 6 figure

Watch with baby: cinema, parenting and community

This article examines the experiences of women attending dedicated screenings in one Glasgow cinema with their babies. Drawing on participant observation and interviews with 25 women, the article explores the possibilities of pleasure that exist in this context, arguing that watching with baby is most consistently experienced as pleasurable when women are able to reconcile their expectations as adult cinema-goers with their new roles as mothers. Pleasure depends less on film choice than on the possibilities for community and for intimacy that are created in the reconfigured cinema space. The emphasis on the cinema space, its organization and the relationships made possible within it is reminiscent of historical accounts of cinema-going and poses something of a challenge to more contemporary accounts of audiences organized around film texts. This study also begins to consider the ways in which this particular leisure practice fits with — and occasionally conflicts with — discourses of ‘good’ parenting in women’s accounts