液晶光子晶体可调自准直特性研究

液晶材料光子晶体由于具有可调谐性而得到了广泛的研究,但目前的研究主要集中在可调的光子带隙特性上。详细研究了液晶光子晶体的可调自准直特性。使用平面波展开法分析了液晶旋转角对光子晶体自准直频率的影响,并使用时域有限差分法对光在液晶光子晶体中的传输进行了仿真。结果表明,通过控制液晶旋转角,可以对光子晶体自准直频率进行调节,从而满足不同频率自准直的需要。

Assessment of Seawater Quality Status in Zhongjieshan Archipelago Waters and Its Neighborhood

During the period of November in 2010, we made one complete oceanographic survey on the seas which were near the Zhongjie Mountain Island. The survey was measured through several analytical tools. They were single index method, organic pollution index method and water eutrophication index method respec- tively. The final survey results showed, most of the survey areas were polluted in varying degrees. Among them, the coastal waters were polluted quite heavily. The oil contents in each station were all exceeded to the water quality standard of the first sea water. Except that, the excessive rate of inorganic nitrogen and active phos- phate were respectively to 75% and 67%, 67% of the survey stations were in eutrophic state. The maximum eutrophication index was 2.68, which exists in station 9. 75% of the survey stations were in middle or heavily polluted statement. The maximum pollution index was 4.8, which exists in station 9.