Sb，In，P掺杂对SnO_2薄膜透明导电性能的影响(英文)

采用溶胶凝胶(Sol-Gel)技术制备了SnO2:(Sb,In)透明导电薄膜,优化了制备工艺参数,获得了最佳制备条件,研究表明,4%的铟掺杂有效地改善了薄膜的内部结构,使得紫外-可见光的透过率显著增加;7%的锑掺杂释放出了更多的载流子,使薄膜的方块电阻降低,2%的磷掺杂因准连续杂质能带的形成进一步提高了薄膜的电导率.Sb、In、P的掺入使得SnO2薄膜的紫外-可见光的透过率达83%,方块电阻达38Ω/□     

Effect of solvent volume on the physical properties of undoped and fluorine doped tin oxide films deposited using a low-cost spray technique

Undoped and fluorine doped tin oxide films were deposited from starting solutions having different values of solvent volume (10-50 ml) by employing a low cost and simplified spray technique using perfume atomizer. X-ray diffraction studies showed that there was a change in the preferential orientation from (2 1 1) plane to (1 1 0) plane as the volume of the solvent was increased. The sheet resistance (R_sh) of undoped SnO₂ film was found to be minimum (13.58 KΩ/□) when the solvent volume was lesser (10 ml) and there was a sharp increase in R_sh for higher values of solvent volume. Interestingly, it was observed that while the R_sh increases sharply with the increase in solvent volume for undoped SnO₂ films, it decreases gradually in the case of fluorine doped SnO₂ films. The quantitative analysis of EDAX confirmed that the electrical resistivity of the sprayed tin oxide film was mainly governed by the number of oxygen vacancies and the interstitial incorporation of Sn atoms which in turn was governed by the impinging flux on the hot substrate. The films were found to have good optical characteristics suitable for opto-electronic devices.     

质子衰变实验进展

按照粒子物理标准模型理论,重子数是绝对守恒的.而大统一理论(GUTs)明确地否定了重子数的对称性,预言质子会衰变成更轻的次粒子.文章论述了质子衰变的物理概念、基本探测条件和主要实验现状,并在探测方法的探讨和探测技术的改进方面融入了一些想法.目前一般认为质子的寿命为τp>1032年左右.质子衰变的探测,对于新理论模型的验证、宇宙学和粒子物理学的发展具有重要意义.     

27,28P+28Si总反应截面增强及可能相关的机制

测量了27,28P和相应同中子异位素在28Si靶上的中能反应截面.测得N=12和13同中子异位素的反应截面在Z=15处突然增大.对Z≤14同中子异位素和28P的实验数据结果可以用改进的光学极限近似的Glauber理论很好地描述.28P的反应截面能够用扩大核芯以改进的Glauber理论来解释.但是,用改进光学极限和少体近似的Glauber理论却低估了27P的实验数据.理论分析表明,扩大的核芯加质子晕可能是响应27P+28Si反应截面增强的机制. The reaction cross sections of~(27,28)P and the corresponding isotones on Si target were measured at intermediate energies. The measured reaction cross sections of the N=12 and 13 isotones show an abrupt increase at Z=15. The experimental results for the isotones with Z≤14 and~(28)P can be described well by the modified Glauber theory of the optical limit approach. The enhancement of the reaction cross section for~(28)P could be explained by the modified Glauber theory with an enlarged core. Theoretical ana...     

PEMFC气体扩散层干燥过程孔隙网络模拟

本文采用三维孔隙网络模型从孔隙尺度上对质子交换膜燃料电池气体扩散层中水分蒸发的干燥过程进行了模拟,并考虑了阴极流道的影响.计算结果表明毛细力在气体扩散层的干燥过程中起主要作用,气相从阴极流道底部开始,以沿气体扩散层厚度方向侵入为先,直到到达气体扩散层底部,随后气相才向流道肩部水平延伸侵入.蒸发速率随气体扩散层中水饱和度...     

Proton coupled electron transfer reaction of phenols with excited state ruthenium(II) – polypyridyl complexes

The reaction of phenols with the excited state, *[Ru(bpy)₃]²⁺ (E₀ = 0.76 V) and *[Ru(H₂dcbpy)₃]²⁺, (dcbpy = 4,4′‐dicarboxy‐2,2′‐bipyridine) (E₀ = 1.55 V vs. SCE) complexes in CH₃CN has been studied by luminescence quenching technique and the quenching is dynamic. The formation of phenoxyl radical as a transient is confirmed by its characteristic absorption at 400 nm. The k_q value is highly sensitive to the change of pH of the medium and ΔG⁰ of the reaction. Based on the treatment of k_q data in terms of energetics of the reaction and pH of the medium, proton coupled electron transfer (PCET) mechanism has been proposed for the reaction. Copyright © 2010 John Wiley & Sons, Ltd.     

Subluminal and superluminal propagation in Er<Superscript>3+</Superscript> doped fiber Bragg grating

The method to pump the FBG written into an Er³⁺-doped optical fiber is proposed to decrease or increase the group velocity of a probing pulse based on the fact that a pump-induced process changes the refractive index and dispersion associated with the ⁴I_15/2-⁴I_13/2 transition in Er³⁺-doped optical fiber. The system equations are derived. The group velocity modification is numerically demonstrated and discussed with the effects of an optical pump power, fiber Bragg grating length, doping concentration of Er³⁺ ions, and modulation amplitude of the grating.     

透明导电氧化物的原理、问题与研究分析

现代光电子产品和能源技术都大量使用透明导电氧化物（TCO）薄膜.由于太阳能电池、平板显示器、发光二极管、短波长激光器、节能玻璃窗等应用领域日益增长的需求,TCO薄膜获得了越来越广泛的应用.文章总结了TCO薄膜的功能原理、应用需求和当前的研究方向,重点分析了p型TCO薄膜研究所要解决的关键问题（其中包括掺杂非对称性,性能退化与缺陷的生成,结构和变化的关系）,指出了p型TCO薄膜制备的关键因素,研究的热点问题和蕴藏的研究机会.     

低电感大电流长寿命同轴型电容器

介绍了一种应用于高功率脉冲源的低电感、高通流能力、长寿命的同轴型电容器。通过理论计算,综合考虑电容器的工作电压、电感、通流能力、与开关的连接方式等,确定了电容器的芯子结构、绝缘子结构及电极结构。通过设计实验线路,测试了电容器的电压、电感、通流能力、寿命等参数。实验结果表明：电容器电容量1.5 μF,工作电压100 kV,工作电流250 kA,峰值电流大于300 kA,电容器电感小于20 nH,储能密度205 J/L,工作寿命大于6 000次。     

有限长带电导体直线的电荷分布

通过3种方式给出有限长带电导体直线的电荷密度分布,结果表明电荷分布并不均匀.