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Ground penetrating radar antennas used for voids detection in the tunnel are almost ground-coupled, which leads to a slow detection speed, and also was greatly affected by the surrounding environment and operation factors, to improve the detection speed and reduce the effect of surrounding environment, the air-coupled antenna, Vivaldi antenna I was chosen, and a series improvement were proposed, finally...
Open innovation emphasis on integration of internal and external innovation resources, and on the external marketing channels of new products or new technologies to improve firms' innovation ability. According to the properties of open innovation, this paper divides the manufacturing industries into three catalogs. Using Tobit regression analysis, this paper empirically verifies the impact of industry...
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