西藏谢通门县雄村铜(金)矿矿石物质成分研究及其意义

西藏谢通门县雄村铜(金)矿是新发现的超大型细脉浸染型铜(金)矿.通过详细的岩石学、矿石学研究,表明矿石类型主要分为氧化矿石、次生硫化物矿石和细脉浸染状硫化物矿石三大类型.矿石主要为细脉浸染状.主要金属矿物为黄铜矿、黄铁矿、磁铁矿、磁黄铁矿,其次是辉铜矿等.主要非金属矿物为石英,约占矿物总量的60%～70%;其次是红柱石、钾长石、斜长石、黑云母、白云母、绢云母、绿帘石、石榴子石等.矿石主成矿元素以Cu为主,伴生有用组分为Au,Ag,Zn和Pb等.     

Activity patterns and habitat use of pudu deer (Pudu puda) in a mountain forest of south-central Chile

The pudu (Pudu puda) is a small, endemic deer, and the only native ungulate found in Chilean and Argentinean temperate forests. Its ecology, including its double role as an herbivore and as a prey, is poorly known. Therefore, it is pressing to gain a better understanding of the pudu given that its habitat is being transformed rapidly by anthropogenic causes. On a coastal mountain range in south-central Chile, we conducted a habitat use study and examined the activity patterns of the pudu using camera traps. The study area was a large native forest patch, surrounded by commercial plantations which would not constitute a habitat for this deer. Using a sampling effort of 7559 camera days, we found that this deer was largely nocturnal with little activity during daytime. The pudu selected Araucaria forests, and avoided Nothofagus forests. These behaviours suggest that the pudu traded off habitat use patterns and activity time to avoid predation, mainly by puma which is the top predator in the rich local community of carnivores occurring in the latter habitat.     

冲击电流计空气阻尼的讨论

分析了冲击电流计空气阻尼的原因，并通过实验测量，计算出空气阻尼的大小