At the 2nd China (Shanghai) International Technology Import and Export Fair held recently, a number of scientific research projects exhibited by Fudan University, Tongji University and Shanghai Jiaotong University were unveiled. In the Hall 2 of the Shanghai Stock Exchange, the university exhibition area, which is composed of many colleges and universities, has become a highlight of the exhibition.
Square dance is popular among many middle-aged and elderly people, but the music is too loud and disturbs the people, causing more and more disputes. The active directional loudspeaker developed by Prof. Ma Jianmin from the Department of Mechanics of Fudan University has attracted much attention at the exhibition. According to the principle of parametric array, this device self-demodulates high-directional audible sound by using the nonlinear interaction of sound waves propagating in the air; then, the air will quickly filter the high-frequency signal, and the audible sound signal thereon will be It will naturally filter out and realize the directional propagation like audible sound image laser. It can be widely used in the fields of guiding blindness, navigation channel and air traffic command. It is a high-tech directional launching system with strong practicability. The noise nuisance problem provides a solution to the best of both worlds. At present, the active directional loudspeaker has just completed the "laboratory sample" trial production. After the appearance of the Shanghai Stock Exchange, it has attracted many companies to contact and cooperate.
Professor Liu Erzhen from Tongji University and his team's deep-penetrating communication equipment that penetrated the 300-meter rock formation were also the major scientific achievements of the exhibition. The two days of exhibition have attracted the attention and reports of many media. This type of communication equipment is small in size and easy to move. It can effectively penetrate media such as rock formations, coal mines, mud, ice, sea water and metal. The penetration depth can reach several hundred meters. If it is used in practice, it will be mine disaster in the future. In the rescue of life to win precious time. At the exhibition, Professor Liu hopes to carry out more cooperation with relevant enterprises and research institutes to jointly bring this research result to the market.
“In the past, the scientific research results of colleges and universities were often limited to laboratories. We have less understanding of the market, and many valuable scientific research results are difficult to get out of the 'ivory tower' and get practical production applications.†Fudan University Science and Technology Department Technology Transfer Center Zhu Xingfei, the person in charge, said, “As a university, we now need to use the exhibition platform like the Shanghai Stock Exchange to have more understanding of the society and market needs.â€
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