Abstract: The damping characteristic of fly ash filled fiber reinforced epoxy resin was examined by varying the fly ash concentration from 0 to 30% by weight. Dynamic Mechanical Analyzer (DMA) was used to determine the temperature dependency of damping factor (tan δ). The testing was done under 3-point bending mode with frequency input of 10Hz at ramp rate of 5°C/min. The unsilanized and silanized fly ash concentration effect was compared and fly ash concentration limit for better damping property was ascertained. It was found that the glass transition temperature (Tg) and tan δ values improved with addition of fly ash up to certain point beyond which any further addition decreased Tg and tan δ. However the storage modulus and loss modulus increase with an increase in fly ash concentration. It was also found that silanized fly ash had lower tan δ value as compared to unsilanized fly ash.

• Publication Date: 11-Aug-2012
• DOI: 105
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Abstract: Mutual Authentication in the multi server environment of an organization, done at the transport layer, becomes complex when communication is done over the public link. Secure Shell protocol is the de facto standard and is deployed over the public network, for determining identity of client and server through Password-based key exchange schemes like AuthA and DH-EKE etc. This password based key exchange schemes and their multiple modes of operation are secure under the computational Diffie-Hellman intractability assumption but could not withstand security requirements and are vulnerable to attacks. So the paper focuses on additional tier of security for transport layer security protocol by using Fingerprint for mutual authentication in the multi server environment of an organization along with the Password. With the help of two identity parameters password and fingerprint, an ideal password authentication scheme would be generated.

• Publication Date: 23-Jun-2012
• DOI: 104
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