November 2010

Rotor angle stability analysis of a distributed generator connected to distribution network

This paper describes the rotor angle stability analysis of a distributed generators connected to a 10 kv distribution network consisting of wind generators, microturbines, and CHP plants. The distribution network being modeled in Matlab/Simulink/Sim Power-system takes into account detailed dynamic models of the generators. Fault simulations at various locations are investigated. For the studied cases, the critical...

Author(s): T. Ananthapadmanabha, A. D. Kulkarni, ManojKumar Pujar, H. Pradeep and S. Chetan

November 2010

A new scheme of image watermarking based on fuzzy clustering theory

Digital watermarking technology has the advantages of easy implementation and capability of providing wide security services such as copyright protection, authentication and secret communication. In this paper, a novel image watermarking approach based on embedding watermarks in different domains, without any distortion of the watermarked image is used. In the spatial domain, the processing method is based on...

Author(s): Sameh Oueslati, , Adnane Cherif and Bassel Solaiman

November 2010

A feed antenna for dielectric spheres lens in the Ka band

In this paper, a feed antenna for dielectric spheres lens in the Ka band, which is a circularly polarized short dielectric rod antenna, is presented. The structure combines with circular polarizer and short dielectric rod antenna skilfully. The circular polarizer with dielectric septum realizes the circular polarization. The short dielectric rod antenna achieves the high gain. Compared with the long dielectric rod...

Author(s): Yinfang Xu, Yongjun Xie, Zhenya Lei and Chao Deng