THE value of the T-piece principle in reducing the resistance an anaesthetic apparatus offers to respiration is well established. Unfortunately the commonly used Ayre's (1937) T-piece cannot be connected directly to the endotracheal tube. The angled connectors and pieces of rubber tubing which must be interposed markedly increase the resistance of the apparatus to respiration. To overcome this ...

This paper focuses on two aspects of piece resolution in backward chaining for conceptual graph rules 13]. First, as conceptual graphs admit a rst-order logic interpretation, inferences can be proven by classical theorem provers. Nevertheless, they do not use the notion of piece, which is a graph notion. So we deene piece resolution over a class of rst-order logical formulae: the logical rules....