Use of hydrated material for dynamic seal faces in shaft seal

Apical seal versus coronal seal

the results of the initial study. It was concluded that the apical fluids, with their primary source being blood serum, diffuse into the empty canal spaces, stagnate, undergo degradation and then act as a physicochemical irritant when they diffuse back into periapical tissues. In support of this theory of stagnation, in 1955 Dow and Ingle showed that the majority of the endodontic failures were...

Sealing Performance of a Mobile AC Compressor Shaft Seal

In the last years, environmental concerns such as the destruction of the ozone layer and global warming led to the demand of tighter air conditioning (AC) systems. The compressor has been identified as the most emissive component of the AC system. Due to its complex structure and sealing mechanism, the shaft seal is the leak-prone part. This paper presents an experimental study of several lip s...

The UNESCO Seal of Excellence for Handicrafts

The UNESCO Seal of Excellence for Handicrafts

Design and analysis of a shaft seal system for the Waste Isolation Pilot Plant

As part of the demonstration of compliance with federal regulations, a shaft seal system has been designed for the Waste Isolation Pilot Plant. The system completely fills the 650-m shafts with components consisting of the common engineering materials, each of which possesses low permeability, longevity, and can be constructed using available technology. Design investigations couple rock mechan...