搜索结果: 1-6 共查到“大气科学 LED”相关记录6条 . 查询时间(0.078 秒)
地面太阳辐射受大气层、时间、地理、气候等环境因素影响很大，很难及时获得稳定的、可重复的、可控的阳光，无法满足定量实验、仪器标定、性能测试等要求。因此，常采用太阳模拟器作为模拟太阳辐射物理特性与几何特性的实验或定标设备。发光二极管（LED）以其高效环保、安全稳定逐渐成为太阳模拟器的热点光源。目前，LED太阳模拟器主要实现了特定平面上的3A特性以及变化的地面太阳光谱的模拟，在满足一个太阳常数（100m...
Six million years ago, atmospheric shifts led to increased diversity of grassland mammals（图）
Six million years ago atmospheric shifts grassland mammals
2019/10/30
Six million years ago, grass-eating mammals became more diverse in South America. Shifts in tropical atmospheric circulation known as Hadley circulation led to changes in climate and vegetation, espec...
OU-Led Study Links Deep-Time Dust with Major Impacts on Carbon Cycling
OU-Led Deep-Time Dust Carbon Cycling
2015/12/7
A University of Oklahoma-led study links vast amounts of iron-rich dust deposits from the late Paleozoic period of 300 million years ago with implications for major ecosystem fertilization and a massi...
Arctic snow not darkening due to soot,dust,Dartmouth-led study finds
Arctic snow soot dust Dartmouth-led
2015/11/12
For millennia, Greenland's ice sheet reflected sunlight back into space, but satellite measurements in recent years suggest the bright surface is darkening, causing solar heat to be absorbed and surfa...
Study finds sudden shift in “forcing” led to demise of Laurentide ice sheet
forcing led to demise Laurentide ice sheet
2015/7/13
A new study has found that the massive Laurentide ice sheet that covered Canada during the last ice age initially began shrinking through calving of icebergs, and then abruptly shifted into a new regi...
新加坡南洋理工大学研发LED灯光净化空气
新加坡南洋理工大学 LED灯光 净化空气
2013/7/24
新加坡南洋理工大学科研团队开发首款LED灯光驱动的室内空气净化机，可在四小时内消除办公室或住家高达95％的有害气体，从而提高建筑物内的空气质量。
室内有害气体统称“挥发性有机化学物质”，一般从墙壁油漆、新家具、建筑材料或地毯中散发出来，在新建筑或刚翻修不久的建筑物内含量特别高，长期接触可能危害健康，例如眼睛、鼻子和喉咙受刺激，甚至会引发头痛、恶心和不适等。目前清除悬浮微粒主要是用微粒空气过滤器，...