Road transport has become by far the major source of environmental pollution and traffic congestion in urban areas. Though a lot of research has been done to investigate the functional relationship linking air quality and air pollution from transport, a further improvement in the knowing of this relationship is needed. The aim of this study was to analyze this relationship and to develop a more...

7 The effects of entrained air on microstructure and transport properties of concrete with up to 11.5% air at different w/c 8 ratios, curing and conditioning regimes were investigated. It was found that air voids disrupt the packing of cement and 9 increase the heterogeneity of the microstructure. The width of the affected interface is around 30 μm. Gaseous 10 diffusivity and permeability are i...

The air transport sector has never been consistently profitable. Further the true nature of the air transport market has long been hidden beneath a maze of regulations and controls. These have to some extent been gradually relaxed in many markets over the past twenty years, at least as far as operations are concerned. Fixed infrastructure, however, remains heavily regulated. There still remains...

canister desorption is a widely used technique to measure the gas content of coal. the gas content data, when normalized to volume/weight and multiplied by coal seam mass, is used to estimate the gas in place in an area around the cored hole. however, the gas content and the percentage of each constituent are likely to be influenced by trapped air in the canister at the time of the coal enclosu...

BACKGROUND Little is known about the risks of urgent air-medical transport used in regionalized health care systems. We sought to determine the incidence of in-transit critical events and identify factors associated with these events. METHODS We conducted a population-based, retrospective cohort study using clinical and administrative data. We included all adults undergoing urgent air-medical...

In this work, back trajectories of air masses arriving in Toronto were classified into distinct transport patterns by cluster analysis and, for the first time, by a neural network (Adaptive Resonance Theory—ART-2a). Different similarity criteria were used by the two classification techniques, the former relying on the Euclidean distances between trajectories, the latter on the Euclidean angles ...