Quantification of Methane Emissions from Cold Heavy Oil Production with Sand Extraction in Alberta and Saskatchewan, Canada.

Cold heavy oil production with sand (CHOPS) is an extraction process for heavy oil in Canada, with the potential to lead to higher CH venting than conventional oil sites, that have not been adequately characterized. In order to quantify CH emissions from CHOPS activities, a focused aerial measurement campaign was conducted in the Canadian provinces of Alberta and Saskatchewan in June 2018. Total CH emissions from each of 10 clusters of CHOPS wells (containing 22-167 well sites per cluster) were derived using a mass balance computation algorithm that uses in situ wind data measurement on board aircraft.

Persistence with cholinesterase inhibitor therapy for dementia: an observational administrative health database study.

Objective: To determine if choice of drug and ease of administration affect persistence of therapy with cholinesterase inhibitors (ChEIs) for treatment of dementia.

Methods: An observational administrative health database study was conducted in 5622 patients aged >or=65 years who received a new prescription for donepezil (DON), rivastigmine (RIV) or galantamine (GAL) from February to May 2006. Patients were followed for 1 year from initiation of therapy to determine percentage persistence and days of therapy.