An optical readout uncooled infrared (IR) imaging detector of bimaterial cantilever array using knife-edge filter operation (KEFO) is demonstrated. The angle change of each cantilever in a focal plane array (FPA...An optical readout uncooled infrared (IR) imaging detector of bimaterial cantilever array using knife-edge filter operation (KEFO) is demonstrated. The angle change of each cantilever in a focal plane array (FPA) can be simultaneously detected with a resolution of 10.5 degree. A deformation magnifying substrate-free micro-cantilever unit with multi-fold interval metaUized legs is specially designed and modeled. A FPA with 160×160 pixels is fabricated and thermal images with noise equivalent temperature difference (NETD) of 400 mK are obtained by this imaging detector.展开更多
尽管普遍认为高山生态系统对气候变化的响应非常敏感,但很少有研究探究气候变化对高山植被生产力和土壤侵蚀的影响.基于古生态学记录,探究了全新世中期以来处于东亚季风影响区的太白山高海拔区植被生产力和土壤侵蚀的演变.高分辨率高山...尽管普遍认为高山生态系统对气候变化的响应非常敏感,但很少有研究探究气候变化对高山植被生产力和土壤侵蚀的影响.基于古生态学记录,探究了全新世中期以来处于东亚季风影响区的太白山高海拔区植被生产力和土壤侵蚀的演变.高分辨率高山湖沼记录显示,植被生产力与年平均温度密切相关,而土壤侵蚀主要受到东亚夏季风所带来的降水的影响.即在5800~4000cal. a BP期间,年平均温度较低而夏季降水充沛,高山生态系统表现为低的植被生产力且土壤侵蚀严重.但是,从4000cal. a BP开始,年平均温度升高而夏季降水减少,植被生产力显著提高且土壤侵蚀减缓.这些结果表明,古生态学记录可为研究较长时间尺度上的生态系统服务提供有力证据,可帮助制定气候变化下的生态系统可持续发展政策.展开更多
基金This work is supported by National Natural Science Foundationof China (Grant No. 10232030,50076040,10472111)NationalBasic Research Program of China (2006CB300404).
文摘An optical readout uncooled infrared (IR) imaging detector of bimaterial cantilever array using knife-edge filter operation (KEFO) is demonstrated. The angle change of each cantilever in a focal plane array (FPA) can be simultaneously detected with a resolution of 10.5 degree. A deformation magnifying substrate-free micro-cantilever unit with multi-fold interval metaUized legs is specially designed and modeled. A FPA with 160×160 pixels is fabricated and thermal images with noise equivalent temperature difference (NETD) of 400 mK are obtained by this imaging detector.
文摘尽管普遍认为高山生态系统对气候变化的响应非常敏感,但很少有研究探究气候变化对高山植被生产力和土壤侵蚀的影响.基于古生态学记录,探究了全新世中期以来处于东亚季风影响区的太白山高海拔区植被生产力和土壤侵蚀的演变.高分辨率高山湖沼记录显示,植被生产力与年平均温度密切相关,而土壤侵蚀主要受到东亚夏季风所带来的降水的影响.即在5800~4000cal. a BP期间,年平均温度较低而夏季降水充沛,高山生态系统表现为低的植被生产力且土壤侵蚀严重.但是,从4000cal. a BP开始,年平均温度升高而夏季降水减少,植被生产力显著提高且土壤侵蚀减缓.这些结果表明,古生态学记录可为研究较长时间尺度上的生态系统服务提供有力证据,可帮助制定气候变化下的生态系统可持续发展政策.