STUDY OF DEGRADATION MECHANISM AND PACKAGING OF ORGANIC LIGHT EMITTING DEVICES

Organic Light Emitting Devices (OLED) have attracted much attention recently, for their applications in futureFlat Panel Displays and lighting products. However, their fast degradation remained a major obstacle to theircommercialization. Here we present a brief summary of our studies on both extrinsic and intrinsic causes for the fastdegradation of OLEDs. In particular, we focus on the origin of the dark spots by 'rebuilding' cathodes, which confirms thatthe growth of dark spots occurs primarily due to cathode delamination. In the meantime, we recapture the findings from thesearch for suitable OLED packaging materials, in particular polymer composites, which provide both heat dissipation andmoisture resistance, in addition to electrical insulation.

Formation and Evolution of Comets

Although people have studied comets for a long time and used spacecraft to detect comets in a short distance,the formation time and causes of comets are still unresolved.Therefore,according to the formation and evolution law of planets and the dynamic mechanism,the author thoroughly revealed the formation and evolution of comets:A powerful storm cyclone on Neptune,such as the Great Dark Spot,can involve a large number of clouds.These clouds are gradually cooled and compressed in the process of rapidly sinking along the spiral path,and then condense into huge water ice crystals at the bottom of the cyclone;When such a crystal falls into a deep hole filled with liquid hydrogen,it is easy to collide violently with the boulders in the hole,and instantly ignite the liquid hydrogen in the hole.Under the strong push of high-pressure gas,some fragments of the ice crystal can quickly reach a very high initial speed.Especially when the jet direction of the Great Dark Spot is consistent with the direction of Neptune’s revolution speed,such fragments can quickly reach Neptune’s escape speed of 23.56 km/s.Therefore,the fragments can break away from Neptune and enter an elliptical orbit around the sun,becoming a comet.Similarly,when the metal hydrogen at the bottom of a Great Red Spot on Jupiter explodes in a series,the fragments ejected from the Great Red Spot can reach the escape speed of Jupiter of 60 km/s,therefore,such fragments can break away from Jupiter and enter the elliptical orbit around the sun to become comets.Many of these comets can become asteroids in the asteroid belt,which is the formation principle of the asteroid belt.

Detection of oil spills in a complex scene of SAR imagery

We present a method for detecting oil spills in a complex scene of SAR imagery,including segmenting oil spills,and avoiding false alarms.Segmentation is carried out using a multi-time and multi-hierarchical method by dividing the complex sea surface into bright sea and dark sea.Gray-based and edge-based segmentations are done to extract oil spills from bright and dark sea,respectively.The proposed method can extract complete oil spills,obtain better visual results,and increase detection probability more accurately than the traditional method.Based on the surrounding features and the oil spills’features,dark land spots and low contrast dark spots are removed efficiently,thus reducing false alarms.The experimental results demonstrate that the proposed algorithm has fast computation speed,high detection accuracy,and is very useful and effective for detecting oil spills in SAR imagery.