Fluorinated gases pharmaceutical industries, as well as in refrigeration when combined with other gases. PFCs were commonly used as fire extinguishants in the past and are still found in older fire protection systems. They are also a by-product of the aluminium smelting process. Sulphur hexafluoride (SF) is used primarily as an insulation gas. It can be found in high-voltage switchgear and is used in the production of magnesium. HFCs were developed in the 1990s to substitute substances such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). As these substances were found to deplete the ozone layer, the Montreal Protocol lays down provisions for them
The Montreal School the texts. The Montreal School The Montreal School, as its name suggests, is a school of thought in the field of organizational communication. It was initiated by James R. Taylor and colleagues in the Department of Communication at the Université de Montréal. It origin can be traced back to the introduction in 1987 of a new doctoral program bringing together three major French-language universities in Montreal, the Université de Montréal, the Université du Québec à Montréal, and Concordia University. The Montreal School has had, and continues to have, a global resonance in Europe ) as well as on the American