Weak localization and small anomalous Hall conductivity in ferromagnetic Weyl semimetal Co2TiGe.

Several cobalt-based Heusler alloys have been predicted to exhibit Weyl Semimetal behavior due to time reversal symmetry breaking. Co2TiGe is one of the predicted ferromagnetic Weyl semimetals. In this work, we report weak localization and small anomalous Hall conductivity in half-metallic Co2TiGe thin films grown by molecular beam epitaxy. The longitudinal resistivity shows semimetallic behavior. Elaborate analysis of longitudinal magnetoconductance shows the presence of a weak localization quantum correction present even up to room temperature and reduction in dephasing length at lower temperature. Negative longitudinal magnetoresistance is observed from 5 to 300 K, but at 300 K magnetoresistance becomes positive above 0.5 T magnetic field. The anomalous Hall effect has been investigated in these thin films. The measured anomalous Hall conductivity decreases with increasing temperature, and a small anomalous Hall conductivity has been measured at various temperatures which may be arising due to both intrinsic and extrinsic mechanisms.

Utilization of Prostate Cancer Quality Metrics for Research and Quality Improvement: A Structured Review.

BACKGROUND: The shift toward value-based care in the United States emphasizes the role of quality measures in payment models. Many diseases, such as prostate cancer, have a proliferation of quality measures, resulting in resource burden and physician burnout. This study aimed to identify and summarize proposed prostate cancer quality measures and describe their frequency and use in peer-reviewed literature. METHODS: The PubMed database was used to identify quality measures relevant to prostate cancer care, and included articles in English through April 2018. A gray literature search for other documents was also conducted. After the selection process of the pertinent articles, measure characteristics were abstracted, and uses were summarized for the 10 most frequently utilized measures in the literature. RESULTS: A total of 26 articles were identified for review. Of the 71 proposed prostate cancer quality measures, only 47 were used, and less than 10% of these were endorsed by the National Quality Forum. Process measures were most frequently reported (84.5%). Only 6 outcome measures (8.5%) were proposed-none of which were among the most frequently utilized. CONCLUSION: Although a high number of proposed prostate cancer quality measures are reported in the literature, few were assessed, and the majority of these were non-endorsed process measures. Process measures were most commonly assessed; outcome measures were rarely evaluated. In a step to close the quality chasm, a "top 5" core set of quality measures for prostate cancer care, including structure, process, and outcomes measures, is suggested. Future studies should consider this comprehensive set of quality measures.

Technical efficiency of nursing homes: do five-star quality ratings matter?

This study investigates associations between five-star quality ratings and technical efficiency of nursing homes. The sample consists of a balanced panel of 338 nursing homes in California from 2009 through 2013 and uses two-stage data envelopment (DEA) analysis. The first-stage applies an input oriented variable returns to scale DEA analysis. The second-stage uses a left censored random-effect Tobit regression model. The five-star quality ratings i.e., health inspections, quality measures, staffing available on the Nursing Home Compare website are divided into two categories: outcome and structure form of quality. Results show that quality measures ratings and health inspection ratings, used as outcome form of quality, are not associated with mean technical efficiency. These quality ratings, however, do affect the technical efficiency of a particular nursing home and hence alter the ranking of nursing homes based on efficiency scores. Staffing rating, categorized as a structural form of quality, is negatively associated with mean technical efficiency. These findings show that quality dimensions are associated with technical efficiency in different ways, suggesting that multiple dimensions of quality should be included in the efficiency analysis of nursing homes. They also suggest that patient care can be enhanced through investing more in improving care delivery rather than simply raising the number of staff per resident.

Cost efficiency of nursing homes: do five-star quality ratings matter?

Nursing homes may respond to the pressure to reduce costs by reducing quality of care, so the two are related. This study examines the determinants of nursing home costs and cost efficiency, and investigates how various measures of nursing home care quality influence both of these. It applies a one-step stochastic frontier approach to a large panel of California nursing homes surveyed between 2009 and 2013. Quality is measured by three different ratings available on the Nursing Home Compare website: rating on quality measures, rating on the health inspection, and rating on staffing levels. Results show that the rating on quality measures, an outcome-based measure of quality, is inversely related to costs but unrelated to mean cost efficiency. In other words, a better rating on quality measures is associated with lower nursing home costs. The health inspection rating is not associated with either costs or mean cost efficiency. The rating for staffing levels, a structural measure of quality, is negatively associated with cost efficiency. These findings reveal that different measures of quality have different relationships with costs and cost efficiency. The findings suggest that better quality outcomes in nursing homes may be achievable with fewer resources and/or improved care procedures, which in turn should reduce nursing home costs.