The Dynamic Characteristics of Silicone Rubber Isolator

The dynamic stiffness and the specific damping energy, as well as the vibration response characteristics of a silicone rubber isolator were researched. The results of the vibration test showed that the silicone rubber isolator was excellent in the performance of vibration control. The dynamic stiffness and the damping characteristics were non-linear. From the comparison between experimental results and simulation analysis, the displacement transmissibility characteristics of the isolator were obtained. As a result, the dynamic characteristics of the isolator could be accurately described by the quadratic type non-linear terms at small amolitude.

糠醛肟醚衍生物的合成及抑菌活性

进一步探究呋喃环在农药研究领域的应用,以糠醛为原料设计合成了13个糠醛肟醚衍生物,并通过核磁共振氢谱、核磁共振碳谱、高分辨质谱对其结构进行表征确证。生物活性测试结果表明:部分目标化合物对柑橘溃疡病菌和水稻白叶枯病菌具有一定抑制活性。其中,2-呋喃甲醛-0-(3-三氟甲基苄基)(31)的抑制率较为突出。在质量浓度为50和100μg/mL时,对柑橘溃疡病菌的抑制率分别为56.0%和74.0%,其EC_(50)为35.1μg/mL优于对照药剂噻唑锌(63.7μg/mL)。化合物31具有进一步研究的价值。