Errors in oxygen tension measurements caused by halothane.
Halothane, independent of oxygen tension, increased the signal of the gold/silver-silver chloride microelectrode. The output of microelectrodes at different oxygen tensions in the presence of increasing amounts of halothane has been measured. Halothane causes an increase in the electrode signal which is proportional to its concentration. This effect results from the polarographic reduction of halothane. It is concluded that the gold/silver-silver chloride microelectrode cannot be used to measure oxygen tension during halothane anaesthesia.
Halothane interference with pO2 measurements and a method of inhibiting its effects.
The oxygen electrode of a blood-gas analyser (Instrumentation Laboratories Inc. Model 313) responded to halothane, the peak of the response being reached some 30-90 min after exposure. The effect was reduced about ten-fold by placing a silicone-rubber membrane over the polypropylene membrane of the oxygen electrode.
Finite Difference Modeling on the Temperature Field of Substrate in Friction Surfacing
Friction surfacing is an advanced process of great potential, especially in the field of repair and reclamation of worn and damaged components. As a kind of thermal processing technology, the temperature profile and changes of the substrate in friction surfacing are important factors to get coatings of high quality. In this paper, the temperature field of the substrate during the process is simulated by finite difference method. The results are consistent with experiments, reappearing the temperature change of the substrate during friction surfacing, allowing further study on figuration and quality of coatings.