Ontario Ministry of Transportation

About: Ontario Ministry of Transportation is a government organization based out in Toronto, Ontario, Canada. It is known for research contribution in the topics: Poison control & Asphalt. The organization has 4652 authors who have published 3882 publications receiving 59011 citations.

Measuring railway performance with adjustment of environmental effects, data noise and slacks

Abstract: Conventional data envelopment analysis (DEA) approaches (e.g., CCR model, 1978; BCC model, 1984) do not adjust the environmental effects, data noise and slacks while comparing the relative efficiency of decision-making units (DMUs). Consequently, the comparison can be seriously biased because the heterogeneous DMUs are not adjusted to a common platform of operating environment and a common state of nature. Although Fried et al. (2002, Journal of Productivity Analysis, 17, 157–174) attempted to overcome this problem by proposing a three-stage DEA approach, they did not account for the slack effects and thus also led to biased comparison. In measuring the productivity growth, Fare et al. (1994, American Economic Review, 84, 66–83) proposed a method to calculate the input or output distance functions. Similarly, they did not take environmental effects, statistical noise and slacks into account and thus also resulted in biased results. To correct these shortcomings, this paper proposes a four-stage DEA approa...

Development of the nbri rapid mortar bar test leading to its use in north america

Abstract: After publication of a rapid mortar bar test method by Oberholster and Davies in 1986 for detection of reactive aggregates, international interest was stimulated. In Canada, a draft CSA test method was prepared. The authors also proposed an ASTM method which was successfully balloted as a proposal standard (ASTM P214) in 1989. Evaluation on many U.S. and Canadian aggregates have been positive with the exception of some alkali-reactive aggregates associated with strained quartz. The development of this rapid method in North America is reviewed along with results of interlaboratory testing and suggested expansion limits at alternate ages based on testing of a group of aggregates of known field performance. (A) For the covering abstract see IRRD 871351.