Quadri-tilings of the plane

We introduce {\em quadri-tilings} and show that they are in bijection with dimer models on a {\em family} of graphs $\{R^*\}$ arising from rhombus tilings. Using two height functions, we interpret a sub-family of all quadri-tilings, called {\em triangular quadri-tilings}, as an interface model in dimension 2+2. Assigning "critical" weights to edges of $R^*$, we prove an explicit expression, only depending on the local geometry of the graph $R^*$, for the minimal free energy per fundamental domain Gibbs measure; this solves a conjecture of \cite{Kenyon1}. We also show that when edges of $R^*$ are asymptotically far apart, the probability of their occurrence only depends on this set of edges. Finally, we give an expression for a Gibbs measure on the set of {\em all} triangular quadri-tilings whose marginals are the above Gibbs measures, and conjecture it to be that of minimal free energy per fundamental domain.Comment: Revised version, minor changes. 30 pages, 13 figure

Treatment of head and neck cancer with photodynamic therapy: results after one year

Photodynamic therapy (PDT) is a new and promising treatment modality for the treatment of malignant disease. This paper reports the preliminary experience of our group in the use of this therapy for the treatment of tumours arising in the head and neck. The majority of treatments in these cases have used a second generation systemic photosensitizer, meta-tetrahydroxyphenylchlorin (m-THPC). Two other cases were treated with either Photofrin 2 (a first generation systemic sensitizer) or with the topical photosensitizer, delta-aminolaevulinic acid (delta-ALA).The initial results have been encouraging with good clinical responses evident in patients presenting with a variety of differing tumour types. We feel there is now sufficient evidence of the efficacy of this treatment to warrant a multicentre prospective study into the treatment of early head and neck cancer with PDT

Visualizing classification of natural video sequences using sparse, hierarchical models of cortex.

Recent work on hierarchical models of visual cortex has reported state-of-the-art accuracy on whole-scene labeling using natural still imagery. This raises the question of whether the reported accuracy may be due to the sophisticated, non-biological back-end supervised classifiers typically used (support vector machines) and/or the limited number of images used in these experiments. In particular, is the model classifying features from the object or the background? Previous work (Landecker, Brumby, et al., COSYNE 2010) proposed tracing the spatial support of a classifier’s decision back through a hierarchical cortical model to determine which parts of the image contributed to the classification, compared to the positions of objects in the scene. In this way, we can go beyond standard measures of accuracy to provide tools for visualizing and analyzing high-level object classification. We now describe new work exploring the extension of these ideas to detection of objects in video sequences of natural scenes

DOD contractor profitability, 1980-1984

http://archive.org/details/dodcontractorpro00morsNAN

Dusty Cometary Globules in W5

We report the discovery of four dusty cometary tails around low mass stars in two young clusters belonging to the W5 star forming region. Fits to the observed emission profiles from 24 micron observations with the Spitzer Space Telescope give tail lifetimes < 30 Myr, but more likely < 5 Myr. This result suggests that the cometary phase is a short lived phenomenon, occurring after photoevaporation by a nearby O star has removed gas from the outer disk of a young low mass star (see also Balog et al. 2006; Balog et al. 2008).Comment: 11 pages, 3 figures. Accepted for publication to ApJ Letter

An Archaeological Survey of Friedrich Park, Bexar County, Texas

An archaeological survey of the Friedrich Park property, in north Bexar County, Texas, was conducted by the Center for Archaeological Research, University of Texas at San Antonio. These investigations were made at the request of the Parks and Recreation Department of the City of San Antonio. The field work was undertaken by the authors during the months of May and July, 1975. All field activities were carried out under the terms of State Antiquities Permit No. 83. Friedrich Park is located in northern Bexar County, approximately 10 miles north of IH 410 and west of IH 10. The specific area examined encompassed a total of approximately 200 acres. The purpose of the survey was to ascertain the existence of any historic or archaeological resources which should be preserved in the interest of the park. Once resources were found, the task of the survey team was to evaluate the nature and the significance of the sites

A systematic review of asylum-seeking women's views and experiences of UK maternity care

ObjectiveTo explore and synthesise evidence of asylum-seeking women's experiences of maternity care in the UK.DesignA systematic review and thematic synthesis of peer-reviewed qualitative evidence. Relevant databases were searched from 2000 until 2018. Study quality was appraised using the Critical Appraisal Skills Programme (CASP) qualitative research appraisal tool.Setting and participantsUK-based studies which describe asylum-seeking women's views and experiences of maternity care.FindingsSix studies were included for thematic synthesis. Seven common themes emerged; ‘Communication challenges’, ‘Isolation’, Mental health challenges’, ‘Professional attitudes’, Access to healthcare’, ‘Effects of dispersal’ and ‘Housing challenges’. The review indicated that pregnant asylum seekers face significant barriers to accessing maternity care due to practical issues related to the challenges of their status and lack of knowledge of maternity services, together with professional attitudes.Key conclusions and implications for practiceMandatory provision of interpreter services, together with training for health care professionals could address urgent issues faced by pregnant asylum seekers. Further research and population-specific guidelines are needed to improve care for these women