This study aims to explain the impact of the Beijing Olympic Games 2008 on China's image in the international TV media. It applies agenda-setting theory to analyse foreign…
This study aims to explain the impact of the Beijing Olympic Games 2008 on China's image in the international TV media. It applies agenda-setting theory to analyse foreign TV coverage of the Olympics in nine countries. Using Rivenburgh's national image richness construct, it attempts to make sense of the coverage before and after Beijing 2008, particularly its impact on the image of the host country. The study concludes that the breadth and attribution of China's image remained relatively stable, that these factors did not improve China's national image directly but that indirectly they raised awareness of China in the international media and framed the host country's image more clearly.
The problem of port and starboard ambiguity will exist when only utilize the vector or scalar parameters. Meanwhile, the amplitude-phase error between the vector and…
The problem of port and starboard ambiguity will exist when only utilize the vector or scalar parameters. Meanwhile, the amplitude-phase error between the vector and scalar can also cause this problem. In this paper, a compound MEMS vector hydrophone which contains cilia vector microstructure and piezoelectric ceramic tube has been presented to solve the problem. Compared with traditional MEMS vector hydrophone, the compound MEMS vector hydrophone can realize the measurement of sound pressure and vibration velocity simultaneously.
A compound MEMS vector hydrophone has been presented. The unipolar directivity of the combined signal which combine the acoustic pressure and vibration velocity is used to achieve the direction of arrival (DOA). This paper introduced the working principle and the target detection mechanism of the compound vector hydrophone. The amplitude and phase error are analyzed and corrected in the standing wave tube. After that, the authors use beam-forming algorithm to estimate the DOA.
The experimental results in the standing wave tube and the external field verified the vector hydrophone's directional accuracy up to 1 and 5 degrees, respectively.
The research of compound vector hydrophone plays an important role in marine acoustic exploration and engineering applications.
This research provides a basis for MEMS hydrophone directivity theory. The compound vector hydrophone has been applied in the underwater location, with a huge market potential in underwater detection systems.