The Seal Performance of Compliant Foil Gas Seal Based on Multi-Scale Analysis

Performance evaluation of trapezoidal teeth labyrinth seal

The present paper investigates the effects of the trapezoidal teeth labyrinth seal on the leakage amount in gas turbines. The influences of increasing the number of teeth from 1 to 6 with step 1 and the tip clearance s=0.5 to 7.5 mm on the leakage flow at different pressure ratios of PR=1.5, 2 and 2.5 are examined, comprehensively. The analysis is performed numerically using a Finite-Volume...

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...

Electronic Seal Stamping Based on Group Signature

This paper describes a new electronic official seal stamping based on Group Signature, USB Key. Bill/Contract in Ecommerce must be seal stamped to gain tamper proof and nonrepudiation. The seal stamping control is designed based on the certificate-based public key. This technique is more efficient for generating and verifying individual/group signatures in terms of computational efforts and com...

The UNESCO Seal of Excellence for Handicrafts

The UNESCO Seal of Excellence for Handicrafts