N95口罩是医疗工作者预防呼吸道疾病传播的核心设备。N95对感染传播的防护效果取决于口罩与佩戴者的贴合度,这与佩戴者的面部尺寸有关。 由中国学者团队近日在环境卫生领域SCI期刊 Journal of Occupational and Environmental Hygiene 发布的文章 Study on the relationship between the fitness of three types of N95 re ...
科学家解决了几十年的显微镜问题 诸平 Fig. 1 The experimental setup by Daan Boltje and Ernest van der Wee. The lens of the light microscope (bottom right) is surrounded by air and looks through a glass plate at the small sphere. On top of the glass plate, the sample is placed in a drop ...