Bruit aérien et équité environnementale dans les quatre plus grandes métropoles canadiennes

Previous environmental equity studies have examined the spatial distribution of aircraft noise across cities. Their findings show that, in several cities, visible minorities and low-income populations are most affected by aircraft noise. In contrast, one study concludes that well-off populations are the most affected. These contradictory findings support the use of a comparative approach for several cities. The aim of this study is twofold. First, we want to identify if there are groups in the population that are in a situation of inequity to aircraft noise exposure in Toronto, Montréal, Vancouver, and Calgary. Then, we want to check if the exposure to the aircraft noise of the different groups varies significantly from one metropolis to another. We use the recommended noise exposure contour maps in Canada: the Noise Exposure Forecasts. Next, four variables are extracted from the 2016 Statistics Canada census at a fine-scale level (dissemination areas): that is, the percentages of low-income, visible minorities, 0- to 15-year-old, and 65-year-old and over populations. The results of a mixed effects logistic regression model show that environmental inequities in terms of exposure to aircraft noise for the four population groups are not consistent from city to city.     

Is Unresolved Inflammatory Angiogenesis a Mechanism for the Delayed Development of Skeletal Lesions in Syphilis?

A recently described case of putative early tertiary syphilis in a young adult male from 6th century Anglo‐Saxon England exhibits a distinctive endocranial pathology. A case–control study using both clinical and archaeological materials was performed to investigate a possible association of the pathology with syphilis. Scanning electron microscopy and microcomputed tomography were used to image the syphilitic case and normal cranial material. Although the pathology does seem to have an association with syphilis (OR = 13.14), the sample size is small, and the authors caution against overinterpretation of the results. The study confirms observations by other authors suggesting the lesion has some association with a range of pathological conditions. Any association with syphilis seems to be restricted to the early tertiary stages and is possibly absent in the later stages of the disease. The morphological differences present in the samples observed by scanning electron microscopy and microcomputed tomography illustrate the abnormal nature of the vascularity within the syphilitic cranium. The widespread presence of similar lesions within other tubular bones leads the authors to propose hypothesis that unresolved angiogenesis is the underlying mechanism behind the skeletal changes in tertiary syphilis. This angiogenic model accounts for several diverse characteristics in the progression of skeletal disease resulting from infection by spirochetes of the Treponema pallidum family. Copyright © 2012 John Wiley & Sons, Ltd.     

A Spatial-Temporal Analysis of Health Care and Mortality Inequalities in China

Two geographers specializing in China TYalyze that country's health care inequality from 1990 to 2008, for the purpose of: (1) examining spatial-temporal variations of health care inequality at multiple scales (the regional, provincial, and county levels); (2) exploring whether economic growth and transition to a market economy have exacerbated the unevenness of health care; and (3) analyzing the impact of health care inequality on health outcomes, especially mortality. The authors apply GIS-based spatial statistical methods to detect spatial-temporal patterns of health care, and use multilevel regression to examine the linkages between health care, mortality, and regional economic inequality, and ultimately to assess the sensitivity of health care inequality to geographic scale and examine whether reforms implemented to date have resulted in more equitable access to health care. The paper also demonstrates how the concurrent transitions of decentralization, marketization, globalization, and urbanization in China have interactively contributed to health care inequality and mortality.     

A Geospatial Analysis of China's Exports, 1991-2008

Three Taiwan-based economists employ a range of exploratory spatial data analysis tools (e.g., Moran's I and LISA statistics) to investigate trends in the growth of China's exports over the period 1991-2008. A particular focus is on the detection of spatial correlations between China and 40 export destination countries in major world regions. Emphasis in the paper on the key years of 1991, 2001, 2006, and 2008 has enabled the authors to analyze the impacts on China's trade of such major events as the country's accession to the World Trade Organization and the global economic crisis of 2008-2009. The results of the spatial analysis reveal the continuing importance of the U.S. and Asian countries in China's export trade (despite changes in the character of trade relations) and identify the spatial outliers (e.g., in Latin America) that may serve as the basis for new export markets for China in the future.     

Is it time to start worrying more about growing regional inequalities in Canada?

Much has been written recently about the rise of within-country inequality and growing imbalances of regional fortunes in the United States and the European Union. In this paper, we apply a novel geo-visualization technique that combines local indicators of spatial association with directional statistics to a unique dataset in order to explore the spatial dimensions of regional income inequalities in Canada from 1981 to 2016. After describing a pattern of growing spatial divergence among regions, we briefly discuss the need for the federal government to explore new types of place-sensitive development policies.