搜索结果: 1-2 共查到“the mid-21st Century”相关记录2条 . 查询时间(0.171 秒)
Space Astronomy for the mid-21st Century: Robotically Maintained Space Telescopes
Space Astronomy the mid-21st Century Robotically Maintained Space Telescopes
font style='font-size:12px;'>
2012/2/24
The historical development of ground based astronomical telescopes leads us to expect that space-based astronomical telescopes will need to be operational for many decades. The exchange of scientific ...
pH of streams in western Finland - a perspective from the Middle Ages into the mid 21st century
acid sulphate soil hydrochemistry acidification ditching land us
font style='font-size:12px;'>
2010/8/11
In the central parts of western Finland, many streams are severely acidified as a result of land-use activities on overburden (soils) capable of producing and ultimately releasing extreme acidity. Con...