四种金龟成虫触角的板形感器和腔锥形感器形态对比

板形感器(placodea sensilla)和腔锥形感器(coeloconica sensilla)是金龟子类害虫最重要的两种嗅感器。本文运用扫描电子显微镜分别对铜绿丽金龟Anomala corpulenta Motschulsky、华北大黑鳃金龟Holotrichia oblita Fald.、棕色鳃金龟Holotrichia titanis Reitter和暗黑鳃金龟Holotrichia parallela Motschulsky的雌雄成虫触角的板形感器和腔锥形感器进行了对比观察。结果表明,四种金龟成虫触角的板形感器和腔锥形感器形态既有相似性,但也存在显著差异,表现出较高的形态多样性,如铜绿丽金龟板形感器表面特化形成龟纹、华北大黑鳃金龟的梭形腔锥形感器等。研究结果丰富了四种金龟的比较形态学理论,也为金龟子的系统分类学研究积累了资料。

Direction-of-arrival estimation for a uniform circular acoustic vector-sensor array mounted around a cylindrical baffle

This work investigates the direction-of-arrival(DOA) estimation for a uniform circular acoustic Vector-Sensor Array(UCAVSA) mounted around a cylindrical baffle.The total pressure field and the total particle velocity field near the surface of the cylindrical baffle are analyzed theoretically by applying the method of spatial Fourier transform.Then the so-called modal vector-sensor array signal processing algorithm,which is based on the decomposed wavefield representations,for the UCAVSA mounted around the cylindrical baffle is proposed.Simulation and experimental results show that the UCAVSA mounted around the cylindrical baffle has distinct advantages over the same manifold of traditional uniform circular pressure-sensor array(UCPSA).It is pointed out that the acoustic Vector-Sensor(AVS) could be used under the condition of the cylindrical baffle and that the UCAVSA mounted around the cylindrical baffle could also combine the anti-noise performance of the AVS with spatial resolution performance of array system by means of modal vector-sensor array signal processing algorithms.