Investigation of the Periodic Microstructure Induced by a 355nm UV Polarized Laser on a Polyimide Surface

We investigate a periodic microstructure induced by a 355nm ultraviolet polarized laser on a polyimide surface and the dependence of the structures on laser parameters.Laser-induced periodic surface structures (LIPSS) of sub-micrometre size were generated on three kinds of polyimide films by a polarized Nd:YAG laser of 355nm within a wide range of laser fluence.The chemical structure of the polyimide,the film-making process,the number of laser pulses and the laser fluence greatly influenced the formation of LIPSS.The periodicity of LIPSS was decided by the wavelength,the incidence angle of the laser beam and the apparent refractive index of the material.     

一种合成量子点的新方法

由于在光计算、光学信息处理等方词的潜在应用前景,半导体材料的光学非线性性质始终受到广泛关注。量子尺寸效应对半导体性能的影响引起了人们极大的兴趣。除了量子阱和超晶格结构外,在半导体的超微粒方面也进行了大量的研究。有关超微粒材料的四波混频,吸收谱带兰移、载流子弛豫及光学双稳态的实验结果已有报道。     

铜激光倍频光亚微米投影光刻系统的设计和实验研究

为了研究波长在２５５．３ｎｍ的铜蒸气激光倍频在亚微米光刻中的可行性，设计了带宽为１ｎｍ的１：１折反射式投影光刻物镜和一个带散射板的光管式均匀照相系统，获得了０．６μｍ的光刻分辨率。此结果表明，铜激光倍频光可作为亚微米光刻的照明光源。     

负载型铑羰基簇催化剂对二氧化碳甲烷化催化性能的研究

利用Rh_4(CO)_(12)制备了负载于γ-Al_2O_3的金属催化剂,考察了它对二氧化碳加氢甲烷化反应的催化活性,并与由RhCl_3制得的催化剂进行比较,发现由铑羰基簇制得的催化剂有较高的催化活性,存在着明显的簇效应.利用小角X-射线衍射分析了催化剂表面的铑粒子分布状态,结果表明,由Rh_4(CO)_(12)制得的催化剂其载体表面金属铑原子有较大的聚集度,且这种聚集度的适当增大对应着铑CO_2甲烷化产率的相应提高,为簇效应的存在提供了佐证.     

3种常用超细颗粒粒径测试方法的比对研究

采用聚苯乙烯球形颗粒,对3种常用颗粒粒径测试仪器扫描电子显微镜（SEM）、原子力显微镜（AFM）、光子相关光谱仪（PCS）的测试结果进行比对,结果表明,对于球形颗粒,3种测试方法所得到的颗粒粒径具有一致性.     

紫外光谱法测定甲壳素的脱乙酰化值

用紫外光谱测定甲壳素脱乙酰程度，该法快速简便，重现性好，试样无需特殊处理。     

氧化与还原条件下伊通河长春区段沉积物重金属形态特征的对比研究

利用改进的Tessier连续萃取法研究了伊通河长春市自由大桥处不同深度沉积物样品在氧化及还原条件下Cu,Pb,Zn和Ni的形态变化规律,同时分析了沉积物样品中酸可挥发性硫(Acid volatile sulfide,AVS)和同时提取重金属(Simultaneous extract metals,SEM)的含量. 实验结果表明，样品经干燥、研磨处理后,Cu有机/硫化物结合态比例减少40%,锰氧化物结合态的比例显著增加; Pb,Zn和Ni 3种元素有机/硫化物结合态比例均略有下降,变化幅度小于Cu,并重新分配到不同的化学相中. 通过SEM中各金属含量与有机/硫化物结合态中金属含量的对比可知,还原性沉积物中Cu除了与硫化物结合外,很大一部分是以有机物形态存在的,Pb,Zn,Ni,Fe和Mn则主要以硫化物形态存在,各元素形态分析均不同程度地受到萃取剂的影响.     

Experimental Test of 7.8GHz Power Extractor Using Dielectric Loaded Rectangular Waveguide Structures

We report on experimental test of a 7.8 GHz power extractor using a dielectric loaded rectangular waveguide structure. This work is conducted at the Argonne wakefield accelerator （AWA） facility. The wakefield is excited by an electron beam travelling through a dielectric loaded rectangular waveguide, and the generated rf power is then subsequently extracted with a properly designed rf coupler. In the experiment, 30 MW of output power is excited by a 66nC single electron bunch, and wakefield superposition by a train consisting of four bunches is also demonstrated. Both the results agree well with theoretical predictions.     

电流变液制动的演示实验

叙述了SiO2／P微囊复合颗粒的制备方法,介绍了演示电流变产应的实验装置及演示过程。