In the fields of engineering, especially in heat transfer area, contribution fluid flows through different channels is remarkable. Among available shapes channel, sinusoidal wavy are considered more efficient areas such as cooling electronic devices, boilers, biomedical applications, etc., due to their increased recirculation capability mixing flowing fluids - which increases performance, conse...

The performance of the turbo codes can be improved by varying parameters such as block size, code polynomial structure and constraint length. This paper proposes a new asymmetric turbo codes that consists of parallel concatenated component codes with mixed type generator polynomials and also different constraint lengths. This scheme optimizes the BER performance of asymmetric turbo codes of bot...

A theoretical formulism based on the boundary matching technique has been proposed to study the systematic of an asymmetric waveguide coupler. Same formulism is applicable to a symmetric coupler. The equivalent parallel coupling length to account for the coupling in the two S-shaped regions in the input and the output of the coupler is obtained from the coupler geometry and is dealt with more a...

Social networks can have asymmetric relationships. In the online social network Twitter, a follower receives tweets from a followed person but the followed person is not obliged to subscribe to the channel of the follower. Thus, it is natural to consider the dissemination of information in directed networks. In this work we use the mean-field approach to derive differential equations that descr...

Article history: Received 11 August 2009 Available online 11 December 2009 Submitted by P.G. Lemarie-Rieusset