光子扫描隧道显微镜光场模拟与分析

采用“分割光束”的方法模拟计算了光子扫描隧道显微镜样品表面近场光强。用平面波对一维结构光盘进行的初步计算结果表明其表面近场光强分布相当复杂，一般情况下近场光强分布并不能真实地描述表面结构，近场光强受到表面结构很强的调制，当针尖与样品间距增大时，光强分布上会迭加上一些微小的波动。光强分布和样品表面结构之间会产生位移，这可能影响利用扫描近场光学显微进行纳加工和定位，将数值计算结果与他人的实验结果进行了     

QUANTUM CONNECTION BETWEEN THE IONS IN DIFFERENT TRAPS

In this paper, we suggest a way to perform coherent quantum arithmetic operation on the ions in different traps by interaction-free measurement. The physical processes and implementation steps of the controlled-NOT operation are carefully investigated. This method is, in effect, to connect different ion tr a ps into one larger integral quantum register. Thus the more complex logic operat ions, as well as the quantum algorithm such as the Shor algorithm whose realizat ion needs thousands of pubits, perhaps will be implemented through this way. It is also pointed out that this method is potentially useful in quantum cryptograp hy and quantum communication.     

关于尿素抽提结晶中的络合物分离问题

尿素可與較大分子的直鏈烃及其衍生物,如醇類、酮類及酯类等,生成晶體絡合物,在通常條件下相當穩定。利用這種性質的分離方法,可以除去石油餾分中的正構烴,以降低該餾分的凝固點,因此該方法無論在中油及重油加工上都是很有發展前途的。該方法所用設備簡單,反應在常溫、常壓下進行,但迄今在石油工業中尚未廣泛應用。在技術上的原因是由