共查询到20条相似文献,搜索用时 15 毫秒
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Abid Karim 《光学学报》2003,23(Z1)
In this paper, a new method is outlined for the estimation of coupling efficiency between a source laser and a WGPD. Internal quantum efficiencies as high as 72% (for 0.15 μm device) and 86.5% (for 0.5 μm device) are achieved. 相似文献
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提出了一种利用激光干涉仪测量光波波长的方法。通过改变在光的传播路径上垂直放置的透明玻璃与光传播方向的角度,使相干光的光程差发生变化;利用干涉条纹与转过角度、透明玻璃厚度之间的关系,通过激光干涉实验能准确测量出光波的波长。 相似文献
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为了建立精确测定X光透镜发散度的实验方法,提出了有效X光源的概念,得到X光束发散度的准确值.推导出了X光束发散度的理论计算公式.零点扫描实验方法证明了理论公式的正确性.晶体转动实验方法测量了X光束的发散度,与理论值符合得很好,晶体转动实验方法应用到对X光透镜发散度的测定可以消除分析晶体不完整性的影响. 相似文献
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A new method to measure the divergence of x-ray beams propagated out from several capillaries is introduced, This new method is based on Bragg's law and is proven efficiently by the experimental measurement with collimators and straight polycapillaries. 相似文献
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S.M. Casey 《Interface Science》1997,5(1):27-34
In this work, methods used to define the misorientation between twograins in a hexagonal crystal are presented. Transformation matricesare generally used to define the misorientation and are found to beconvenient and accurate in most cases. However, in the analysis oflow angle boundaries, it is very difficult to obtain data todetermine the transformation matrix accurately. A new method isdescribed which was developed to overcome this problem and thetechnique is demonstrated using the analysis of a boundary inTi3Al. 相似文献
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精确确定光路中四分之一波片光轴方位的新方法 总被引:1,自引:1,他引:0
为了准确安装四分之一波片,介绍了一种精确确定光路中四分之一波片光轴方位的新方法,并利用米勒矩阵理论分析了影响测量结果的误差因素.测试方法所用的主要理论有米勒矩阵理论、傅里叶分析方法和最小二乘法.该方法利用最小二乘法得到了最优傅里叶系数,利用消光比测试原理实现了检偏棱镜的精确安装,利用反馈环控制系统对步进电机的步进角进行了控制.误差分析表明该方法的测量误差与四分之一波片光轴方位角本身的大小有关.实验结果表明该方法的标准不确定度为0.03. 相似文献
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A new spectrofluorimetric method was developed for the determination of trace amount of 5-hydroxytryptamine (5-HT) in human
urine and serum samples. In the NaAc-HAc buffer solution of pH=5.80, 5-HT can react with formaldehyde-acetylacetone system
to form a new compound which sends yellow green fluorescence at 533nm and the enhanced fluorescence intensity is in proportion
to the concentration of 5-HT. Optimum conditions for the determination of 5-HT were also investigated. The dynamic range and
detection limit for the determination of 5-HT are 5.35×10−7∼1.07×10−4 mol/L and 2.08×10−7 mol/L, respectively. The developed method is simple, practical and can be successfully applied to determination of 5-HT in
human urine and serum samples. Moreover, the enhancement mechanisms of the fluorescence intensity in the 5-HT - formaldehyde-acetylacetone
system have been also discussed. 相似文献
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GONG Lun-Xun PAN Jun-Ting 《理论物理通讯》2008,50(12):1276-1278
In terms of the solutions of the generalized Riccati equation, a new algebraic method, which contains the terms of radical expression of functions f(ξ), is constructed to explore the new exact solutions for nonlinear evolution equations. Being concise and straightforward, the method is applied to nonlinear Klein-Gordon equation, and some new exact solutions of the system are obtained. The method is of important significance in exploring exact solutions for other nonlinear evolution equations. 相似文献
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In terms of the solutions of the generalized Riccati equation,
a new algebraic method, which contains the terms of radical expression of functions f(ξ), is constructed to explore
the new exact solutions for nonlinear evolution equations.
Being concise and straightforward, the method is applied to
nonlinear Klein-Gordon equation, and some new exact solutions
of the system are obtained. The method is of important significance in exploring exact solutions for other nonlinear evolution equations. 相似文献
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优化界面接触、增强界面处载流子传输对于提高钙钛矿电池性能具有重要意义。本研究将适量二甲基亚砜(DMSO)添加到聚(3,4-乙烯二氧噻吩)-聚(苯乙烯磺酸盐)(PEDOT∶PSS)空穴传输层中,改善了空穴传输层的导电性和空穴传输特性,有效提高了反式平面钙钛矿太阳能电池光伏性能。短路电流(Jsc)从21.29 mA/cm2提高到22.15 mA/cm2,填充因子(FF)从76.35%提高到80.09%,转换效率(PCE)从16.02%提高到17.01%。薄膜与器件性能综合测试结果表明,DMSO的掺入使PEDOT∶PSS发生适度相分离,形成更好的PEDOT导电通道,增强了PEDOT∶PSS的导电特性。稳态光致发光光谱呈现出显著的荧光猝灭效应,也表明掺杂DMSO后PEDOT∶PSS的空穴提取能力得到提高,钙钛矿活性层与阳极之间的空穴传输更加顺畅,有助于实现高达80%以上的填充因子。本研究为改善反式平面钙钛矿太阳电池或有机太阳电池光伏性能提供了一种高效、简便的方法,具有很好的现实意义。 相似文献
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新型IPTO(Pr Ti O3掺杂In2O3)薄膜的可见光透过率及导电性可与商业化的ITO薄膜媲美。采用双源电子束设备制备了一种新型的IPTO透明导电薄膜,通过开尔文探针法测试,其功函数为5.14 e V。为验证新型IPTO透明导电阳极对有机电致发光器件性能的影响,将IPTO替代商业化ITO作为阳极制备了有机电致发光器件。基于IPTO阳极的器件的亮度最大值为85 140 cd/m2,外量子效率最大值为3.16%,分别为以ITO为阳极的器件的3倍及1.13倍。这种性能的改善是由于IPTO具有较小的表面粗糙度及较高的功函数,可以降低阳极的注入势垒,有利于电荷向有机层注入,改善了器件内的空穴及电子的注入平衡。 相似文献
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采用溶胶-凝胶法在玻璃基底上制备得到了高透光率,高导电性的掺铝氧化锌薄膜。研究了溶剂对薄膜晶体结构,薄膜厚度,表面形貌,光学性质和电学性质的影响,结果表明:在相同的制备条件下,薄膜的厚度随溶剂沸点的升高而降低;低沸点溶剂制备的薄膜由c轴择优取向的六角纤锌矿结构的晶体构成,且比较致密;所有薄膜可见光区的透光率在85%以上;乙二醇独甲醚为溶剂制备的薄膜电阻率最低,为3.0×1-0 4Ωm。 相似文献
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提出一种利用光反射原理进行小位移量测量的设想 ,并对其进行了原理分析 ,同时给出了实际应用方法 ,最后结合实际应用对其进行了实验验证 ,证明了该原理的可行性和有效性。与机械位移放大法、电阻应变法、压电应变测量等传统小位移量测量方法相比较 ,该方法主要优点是 :对被测位移量干扰小 ,是一种非接触式测量方法 ;位移放大倍数高 ,且便于用户调节 ;测量精度高 ,实现容易 ,成本较低。该方法适合于众多测试场合 相似文献
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氧化铁还原率及金属化率的测量新方法 总被引:1,自引:1,他引:0
用H2及CO还原氧化铁过程中,使用了X-ray粉末衍射和化学分析方法确定了氧化铁及金属铁的定量分析关系。铁素体(αFe)、奥氏体(γFe)、碳化铁(Fe3C)、磁铁矿(Fe3O4)、赤铁矿(Fe2O3)与浮氏体(Fe0.947O)的摩尔强度定量关系的系数分别为0.56,0.56,0.52,0.87和2.57。通过这些系数,可以计算出氧化铁的金属化率和还原率。 相似文献