Objective: The aim of this paper is to determine potentially modifiable factors associated with the high proportion of patients who are readmitted to adolescent psychiatric units. Method: The case notes of 112 adolescents admitted over 1 year to an acute adolescent psychiatry unit were reviewed. Socio-demographic and clinical variables were compared between those who were readmitted over a 12-month period post discharge and those who were not. Results: The readmission rate over a 12-month period was 31%. Males were significantly more likely to be readmitted. No other statistically significant predictors of readmission were identified. There was a trend towards readmission for those with bipolar disorder and a trend away from readmission for those with adjustment disorders. A history of sexual abuse and cluster B personality traits were significantly related to a history of previous admission, but not with subsequent readmission. Conclusions: Readmission is influenced by a number of factors, which may not be easily identified by a chart review. Prospective studies which follow-up adolescents for several years after discharge are needed.

All-reflective interferometric gravitational-wave detector configurations with a diffraction grating as a power beam splitter have been proposed to reduce thermal lensing. We demonstrate the use of a diffraction grating as a polarization beam splitter in a zero-area polarization Sagnac interferometer.

Figure 1: Closeup of Neill Blomkamp's Elysium. c 2013 CTMG.During Neill Blomkamp's sci-fi epic Elysium (Fig.1), we experienced severe noise issues when ray-tracing the glossy reflections and heavy indirect lighting on the colossal habitat, within a tight production schedule. We present a new solution to the common issue of ray-traced noise, drastically reducing render times by expanding the use of a temporal filter to attenuate the weighting of a non-local means algorithm which selectively refines it's result.

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