用微带六端口测量微波复反射系数的研究

设计了一种平面对称结构的微带六端口用来测量微波复反射系数,对测量的原理进行了分析,获得了较好的实验结果。     

Recent patterns and mechanisms of carbon exchange by terrestrial ecosystems.

Knowledge of carbon exchange between the atmosphere, land and the oceans is important, given that the terrestrial and marine environments are currently absorbing about half of the carbon dioxide that is emitted by fossil-fuel combustion. This carbon uptake is therefore limiting the extent of atmospheric and climatic change, but its long-term nature remains uncertain. Here we provide an overview of the current state of knowledge of global and regional patterns of carbon exchange by terrestrial ecosystems. Atmospheric carbon dioxide and oxygen data confirm that the terrestrial biosphere was largely neutral with respect to net carbon exchange during the 1980s, but became a net carbon sink in the 1990s. This recent sink can be largely attributed to northern extratropical areas, and is roughly split between North America and Eurasia. Tropical land areas, however, were approximately in balance with respect to carbon exchange, implying a carbon sink that offset emissions due to tropical deforestation. The evolution of the terrestrial carbon sink is largely the result of changes in land use over time, such as regrowth on abandoned agricultural land and fire prevention, in addition to responses to environmental changes, such as longer growing seasons, and fertilization by carbon dioxide and nitrogen. Nevertheless, there remain considerable uncertainties as to the magnitude of the sink in different regions and the contribution of different processes.     

准噶尔盆地车排子地区古近系层序地层与岩性圈闭预测

为了探究车排子地区古近系层序地层发育规律和地层展布特征,应用经典层序地层学的原理和方法,通过对地震、钻井、测井和露头资料的综合分析,进行井间对比及井-震结合对比,详细研究了古近系层序的划分及特征。在车排子地区古近系识别出2个三级层序、4个体系域。研究区构造为一大型斜坡,可见小型坡折带,坡折带之下低位体系域发育,低位体系域与水进体系域由首次湖泛面分开,高位体系域不发育或不被识别。低位体系域以发育扇三角洲水下分流河道为特征,而水进体系域以滨浅湖相泥岩和粉砂岩沉积为主。地层发育受物源、古地形、气候和湖平面升降的控制,在研究区首次建立了古近系层序地层格架,并在层序地层格架内对研究区进行有利区带的预测,对车排子地区古近系地层寻找以岩性圈闭为主的非构造油气藏将起重要指导作用。     

The red impurity in trypan blue

Zusammenfassung Isolierung und Strukturaufklärung der roten Komponente des teratogenen und karzinogenen Farbstoffs Trypanblau: 8-ammo-2-(3, 3-Dimethylbiphenyl-4azo)-naphth-1-ol-3,6-Disulphonsäure.