Study of fiber-optic current sensing based on degree of polarization measurement

A novel fiber-optic current sensing scheme is proposed by converting the Faraday rotation to the optical signal's degree of polarization (DOP) change. In this scheme, the lightwave passes through a fiber resonant cavity multiply and experiences Faraday rotation simultaneously. Its main merit is immunity from the environment disturbance to the fiber used in ordinary Faraday rotation sensor. Brief theoretical analysis and simulation are given to show its basic characteristics. Experimental results are demonstrated and the feasibility of the proposed method is also shown.     

Self－Assembled Monolayers Exposed by Metastable Helium for Nano－Patterning： Octanethiol and Dodecanethiol

A large-area gold pattern with nanoscale edge on muscovite mica was fabricated by using a metastable helium beam and octanethiol (OT) and dodecanethiol (DDT) self-assembled monolayers (SAM), in which the width of edge was typically ～70nm for the OT SAM and ～90nm for the DDT SAM, respectively. The mask was reproduced with high fidelity. Combined the analysis of roughness with grain size, more fiat surface and sharper edge of patterns were obtained by using the shorter chain molecules such as the OT. All the information indicated that the OT SAMs on atomically ttat surfaces can be used as a resist for exposure to metastable atom beams.     

浓碱溶液中铜阳极产物的阴极还原行为研究 Ⅰ. Cu(Ⅰ)产物的阴极还原

采用特定的电势扫描程序测出了浓碱溶液中Cu(Ⅰ)阳极产物的多重还原电流峰.根据各峰之间转化或竞争的关系,提出了亚铜氧化物的吸附成相和溶解沉淀两种途径共存的形成机理.为确定各阴极峰的归属,本文采用了将阴极电流峰与XRD和XPS特征峰进行半定量对比的方法.     

GC／FTIR与GC／MS法联合分析空气中有机污染物

本文采用气相色谱／傅里叶变换红外光谱（ＧＣ／ＦＴＩＲ）和气相色谱／质谱（ＧＣ／ＭＳ）方法联用，分析了某工作间的空气污染物。通过仔细调整ＧＣ／ＦＴＩＲ联用仪中ＧＣ和ＩＲ参数，使有机混合物得到了很好的分离。在未知物的鉴定中，以质谱法定性为主，红外光谱也发挥了特有的作用，使分析结果更加可靠。     

α—卤代桂皮酰哌啶类化合物的NMR及构型研究

本文报道了六对α—卤代桂皮酰哌啶类化合物的~1H—NMR和~(13)C—NMR研究,通过比较不同温度下~1H—NMR谱中派啶环α—H的化学位移和峰形,讨论了构型,构象变化的影响,从而鉴别了各化合物的Z、E构型,并由~(13)C偶合谱中羰基碳与β烯氢的偶合常数~3J_(CCCH)对结果加以论证。     

氟化锂团簇基纳米相薄膜的慢正电子研究

用慢正电子束流装置研究了氟化锂团簇沉积在单晶硅衬底上构成的纳米相薄膜,获得了正电子湮没S参数和有效扩散长度L_eff. 讨论了制备条件(如衬底温度、蒸发速率、惰性气体分压等)对薄膜微观结构的影响.     

Eu（Ⅲ）和Pr（Ⅲ）六氟乙酰丙酮配合物的EXAFS研究

Ｅｕ（Ⅲ）和Ｐｒ（Ⅲ）六氟乙酰丙酮配合物的ＥＸＡＦＳ研究陶冶＊邵学广赵贵文（中国科技大学应用化学系合肥２３００２６）巨新（中国科学院高能物理所北京１０００３９）作为高效的发光和激光材料，稀土β－二酮类配合物得到广泛研究［１］。８０年代末以来，由于它们...     

(Ba,Mg,Sr)O·nAl2O3:Mn2+的合成及发光性质研究

用高温固相反应合成了Ba0.04Mg0.16Sr0.8O@nAl2O3:Mn2+0.07(n=4.1,4.2…4.9)和Ba0.1Mg0.1Sr0.8O@nAl2O3:Mn2+0.07(n=4.1,4.2…4.9)铝酸盐体系发光材料.X射线衍射呈单相,说明生成了完全互溶的连续固溶体.经检测发现Mg2+,Sr2+的引入有效地优化了发光基质,使Mn2+在真空紫外激发下的发射明显增强.在Ba0.04Mg0.16Sr0.8O@nAl2O3:Mn2+0.07体系中,在一定范围内改变Al3+含量(n值)可适当调整激发光谱峰位;适当调整Al3+和Mn2+的含量比可以改变体系的发光强度,以满足等离子平板显示(PDP)技术的需求.