1,672 research outputs found

    New spaces of food justice [Editorial]

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    Kinematics of Multigrid Monte Carlo

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    We study the kinematics of multigrid Monte Carlo algorithms by means of acceptance rates for nonlocal Metropolis update proposals. An approximation formula for acceptance rates is derived. We present a comparison of different coarse-to-fine interpolation schemes in free field theory, where the formula is exact. The predictions of the approximation formula for several interacting models are well confirmed by Monte Carlo simulations. The following rule is found: For a critical model with fundamental Hamiltonian H(phi), absence of critical slowing down can only be expected if the expansion of in terms of the shift psi contains no relevant (mass) term. We also introduce a multigrid update procedure for nonabelian lattice gauge theory and study the acceptance rates for gauge group SU(2) in four dimensions.Comment: 28 pages, 8 ps-figures, DESY 92-09

    The use of routine outcome measures in two child and adolescent mental health services: a completed audit cycle

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    Background: Routine outcome measurement (ROM) is important for assessing the clinical effectiveness of health services and for monitoring patient outcomes. Within Child and Adolescent Mental Health Services (CAMHS) in the UK the adoption of ROM in CAMHS has been supported by both national and local initiatives (such as government strategies, local commissioning policy, and research). Methods: With the aim of assessing how these policies and initiatives may have influenced the uptake of ROM within two different CAMHS we report the findings of two case-note audits: a baseline audit conducted in January 2011 and a re-audit conducted two years later in December 2012-February 2013. Results: The findings show an increase in both the single and repeated use of outcome measures from the time of the original audit, with repeated use (baseline and follow-up) of the Health of the Nation Outcome Scale for Children and Adolescents (HoNOSCA) scale increasing from 10% to 50% of cases. Re-audited case-notes contained more combined use of different outcome measures, with greater consensus on which measures to use. Outcome measures that were applicable across a wide range of clinical conditions were more likely to be used than symptom-specific measures, and measures that were completed by the clinician were found more often than measures completed by the service user. Conclusions: The findings show a substantial improvement in the use of outcome measures within CAMHS. These increases in use were found across different service organisations which were subject to different types of local service priorities and drivers

    Collective memories, place-framing and the politics of imaginary futures in sustainability transitions and transformation

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    A geographical perspective is crucial to understanding sustainability transitions and transformation, but previous research on place framing in sustainability transitions and transformation has had a marked focus on the politics of the future and its performativity in the present. This paper analyzes place-framing in sustainability transitions and transformation by examining how the conflicting collective memories of a place and the framings of the future of this place interact and lead to the justification of particular forms of socio-material development, land use and sustainability of the peri-urban spaces of the city of Sogamoso, Colombia. Based on 38 semi-structured interviews, we identify three distinct assemblages of future visions, collective memories and place frames, which we call urban development, recovering tradition, and cultural revitalization. The analysis shows that place framing is an exercise through which collective memories and future visions are connected and co-constituted in a spatio-temporal ‘dialogue’: collective memories, future visions and place frames are processes of social construction activated in the attempt to shape or contest sustainability transitions and transformation. We contend that the existence and mobilization of collective memories—and their critical influence on future visions—are a core aspect of the politics of place framing fundamental to the socio-material processes of sustainability transitions and transformation. Furthermore, a politics of place-making in sustainability transitions and transformation involves acknowledging and negotiating collective memories of the past as much as future visions. This suggests ways to critically counterbalance the marked future orientation taken in recent years by sustainability science and transition studies

    Multigrid Monte Carlo Algorithms for SU(2) Lattice Gauge Theory: Two versus Four Dimensions

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    We study a multigrid method for nonabelian lattice gauge theory, the time slice blocking, in two and four dimensions. For SU(2) gauge fields in two dimensions, critical slowing down is almost completely eliminated by this method. This result is in accordance with theoretical arguments based on the analysis of the scale dependence of acceptance rates for nonlocal Metropolis updates. The generalization of the time slice blocking to SU(2) in four dimensions is investigated analytically and by numerical simulations. Compared to two dimensions, the local disorder in the four dimensional gauge field leads to kinematical problems.Comment: 24 pages, PostScript file (compressed and uuencoded), preprint MS-TPI-94-
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