广州口岸截获腹点纹牙甲Dactylosternum abdominale(Fabricius)及腐生昆虫传播探讨

报道了从菲律宾进口的废纸中截获的一种我国无分布的牙甲——腹点纹牙甲Dactylosternum abdominale(Fabricius)。讨论了腐生性昆虫世界性扩散的问题。

某型飞机扩散器接头牙纹损伤的修复

某型飞机扩散器的管嘴接头材料为LF21,在经多个飞行周期后,容易在拆装过程中磕碰损伤牙纹,影响对接的气密性,甚至威胁飞行安全。本文介绍了大修中对该故障的修复情况,此案例可为其他类似故障的修复提供参考。

另类人体的“身份证”

大家都知道,指纹、牙纹是人体的生理“身份证”,其实,人体的生理“身份证”很多,已揭示出的有如下述：

钢琴弦轴漫谈

介绍钢琴弦轴,并详细分析弦轴的纹牙和弦轴尾端倒角,从而提出钢琴弦轴的改进意见。

DACTYLOSTERNUM PUI (COLEOPTERA: HYDROPHILIDAE: SPHAERIDIINAE),A NEW SPECIES IN CHINA

Dactylosternum pui sp. nov. is described from Guangxi, China. It closely related to D. dohertyi Balfour\|Browne but differs from the latter by prosternum very strongly tectiform in middle and sharp carinate medially and with a distinct anteromedian tooth and different aedeagus. The new species can be separable from D. densepunctatum d′Orchymont by tectiform and carinate prosternum and with tooth anteromedially, median femora with dense and short pubescence.