文章针对7.62 mm 53式普通弹的防护,比较了防弹钢板与PE防弹板以及二者复合使用的防弹性能,分别找出了当前技术水平下较为优秀的结构方案和技术方案。在二者复合使用时,比较了不同材料作为迎弹面时防弹性能的差异,并分析了原因。此外,...文章针对7.62 mm 53式普通弹的防护,比较了防弹钢板与PE防弹板以及二者复合使用的防弹性能,分别找出了当前技术水平下较为优秀的结构方案和技术方案。在二者复合使用时,比较了不同材料作为迎弹面时防弹性能的差异,并分析了原因。此外,还比较了多种方案的制造成本,根据测试情况,对各种材料的后续使用给出了有针对性的建议。展开更多
This paper studies the antimicrobial activity of selected engineering materials surfaces at room and chill temperatures. The antimicrobial effects of selected materials surfaces were evaluated by dropping the test pie...This paper studies the antimicrobial activity of selected engineering materials surfaces at room and chill temperatures. The antimicrobial effects of selected materials surfaces were evaluated by dropping the test pieces into prepared cultures of Bacillus spp, Escherichia coli, and Staphylococcus aereus isolated from fruits, animal feaces and natural environment respectively. Bacteria count obtained after 0, 30, 60, 90, 120, 180, 240 and 300 minutes at room temperature and chill condition was taken and compared with their initial count. The amount of live bacteria drops by several orders of magnitude, to zero, on metallic copper and brass within 30 to 300 minutes in both room and chill conditions. In contrast, no reduction is seen in the number of colonies of live bacteria on plastics, ceramic and stainless steel in both room and chill conditions. These results suggest that the selection of metallic copper and brass for touch surfaces in hospitals, surfaces exposed to fruit processing and household utensils can materially assist in reducing bacterial contamination, which should lead to a reduction in the transmission of infectious organisms.展开更多
文摘文章针对7.62 mm 53式普通弹的防护,比较了防弹钢板与PE防弹板以及二者复合使用的防弹性能,分别找出了当前技术水平下较为优秀的结构方案和技术方案。在二者复合使用时,比较了不同材料作为迎弹面时防弹性能的差异,并分析了原因。此外,还比较了多种方案的制造成本,根据测试情况,对各种材料的后续使用给出了有针对性的建议。
文摘This paper studies the antimicrobial activity of selected engineering materials surfaces at room and chill temperatures. The antimicrobial effects of selected materials surfaces were evaluated by dropping the test pieces into prepared cultures of Bacillus spp, Escherichia coli, and Staphylococcus aereus isolated from fruits, animal feaces and natural environment respectively. Bacteria count obtained after 0, 30, 60, 90, 120, 180, 240 and 300 minutes at room temperature and chill condition was taken and compared with their initial count. The amount of live bacteria drops by several orders of magnitude, to zero, on metallic copper and brass within 30 to 300 minutes in both room and chill conditions. In contrast, no reduction is seen in the number of colonies of live bacteria on plastics, ceramic and stainless steel in both room and chill conditions. These results suggest that the selection of metallic copper and brass for touch surfaces in hospitals, surfaces exposed to fruit processing and household utensils can materially assist in reducing bacterial contamination, which should lead to a reduction in the transmission of infectious organisms.
