Critical properties of the Kitaev-Heisenberg model

We study critical properties of the Kitaev-Heisenberg model on the honeycomb lattice at finite temperatures which might describe the physics of the quasi two-dimensional compounds, Na$_2$IrO$_3$ and Li$_2$IrO$_3$. The model undergoes two phase transitions as a function of temperature. At low temperature, thermal fluctuations induce magnetic long-range order by order-by-disorder mechanism. Magnetically ordered state with the spontaneously broken $Z_6$ symmetry persists up to a certain critical temperature. We find that there is an intermediate phase between the low-temperature ordered phase and the high-temperature disordered phase. The finite-sized scaling analysis suggests that the intermediate phase is a critical Kosterlitz-Thouless phase with continuously variable exponents. We argue that the intermediate phase has been actually observed above the low-temperature magnetically ordered phase in Na$_2$IrO$_3$, and likely in Li$_2$IrO$_3$.Comment: 5 pages, 6 figure

How we came to eye tracking animation: A cross-disciplinary approach to researching the moving image

In this article, three researchers from a large cross-disciplinary team reflect on their individual experiences of a pilot study in the field of eye tracking and the moving image. The study – now concluded – employed a montage sequence from the Pixar film Up (2009) to determine the impact of narrative cues on gaze behaviour. In the study, the researchers’ interest in narrative was underpinned by a broader concern with the interaction of top-down (cognitive) and bottom-up (salient) factors in directing viewers’ eye movements. This article provides three distinct but interconnected reflections on what the aims, process and results of the pilot study demonstrate about how eye tracking the moving image can expand methods and knowledge across the three disciplines of screenwriting, screen theory and eye tracking. It is in this way both an article about eye tracking, animation and narrative, and also a broader consideration of cross-disciplinary research methodologies

Treatment utilization and outcomes in elderly patients with locally advanced esophageal carcinoma: A review of the National Cancer Database

For elderly patients with locally advanced esophageal cancer, therapeutic approaches and outcomes in a modern cohort are not well characterized. Patients ≥70 years old with clinical stage II and III esophageal cancer diagnosed between 1998 and 2012 were identified from the National Cancer Database and stratified based on treatment type. Variables associated with treatment utilization were evaluated using logistic regression and survival evaluated using Cox proportional hazards analysis. Propensity matching (1:1) was performed to help account for selection bias. A total of 21,593 patients were identified. Median and maximum ages were 77 and 90, respectively. Treatment included palliative therapy (24.3%), chemoradiation (37.1%), trimodality therapy (10.0%), esophagectomy alone (5.6%), or no therapy (12.9%). Age ≥80 (OR 0.73), female gender (OR 0.81), Charlson-Deyo comorbidity score ≥2 (OR 0.82), and high-volume centers (OR 0.83) were associated with a decreased likelihood of palliative therapy versus no treatment. Age ≥80 (OR 0.79) and Clinical Stage III (OR 0.33) were associated with a decreased likelihood, while adenocarcinoma histology (OR 1.33) and nonacademic cancer centers (OR 3.9), an increased likelihood of esophagectomy alone compared to definitive chemoradiation. Age ≥80 (OR 0.15), female gender (OR 0.80), and non-Caucasian race (OR 0.63) were associated with a decreased likelihood, while adenocarcinoma histology (OR 2.10) and high-volume centers (OR 2.34), an increased likelihood of trimodality therapy compared to definitive chemoradiation. Each treatment type demonstrated improved survival compared to no therapy: palliative treatment (HR 0.49) to trimodality therapy (HR 0.25) with significance between all groups. Any therapy, including palliative care, was associated with improved survival; however, subsets of elderly patients with locally advanced esophageal cancer are less likely to receive aggressive therapy. Care should be taken to not unnecessarily deprive these individuals of treatment that may improve survival

Target: Wellbeing Evaluation - Annual Report (2010)

Target: Wellbeing (TWB) aims to help people across the North West live healthier and happier lives. TWB is delivered through a portfolio of community based programmes and projects, and has been funded by the National Lottery for the period October 2007 to March 2012 through the Big Lottery Fund, with funding linked to health outcomes. This evaluation update of the TWB portfolio provides reach analysis and evidence of behaviour change from the ten local programmes between January 2009 and August 2010, and provides an update to last year’s Target: Wellbeing Evaluation – Annual Report February 2010. The analysis relates to the area based community projects within the TWB portfolio and covers the TWB participants and their evidence of behaviour change. Reach analysis is produced via the registration database with behaviour change evidence from analysis of welcome and exit questionnaires. Forty-four projects have contributed responses to this evaluation, about half of the total number, and sixty-six have used the participant database, contributing to the reach analysis