水溶性芴与噻吩共聚物的合成及蛋白质对其荧光猝灭的影响

采用Suzuki偶合方法合成了含羧酸基团的新型阴离子型水溶性绿光的9,9’-二丙酸钠芴(DPF)和噻吩(TH)共聚物,聚合物分子量约为9000左右,具有较好的水溶性(5 mg/mL).研究了共聚物在不同pH水溶液中的荧光性质,结果表明当pH ＜4时,羧基以COOH形式存在,造成共聚物溶解度降低并产生聚集,荧光减弱;当p...     

卷积神经网络在气体泄漏超声识别中的应用

为了克服现有气体泄漏检测方法的不足,提出一种基于卷积神经网络的气体泄漏超声信号识别方法。在设计卷积神经网络网络结构时,通过多次预训练确定网络层数、卷积核数目和尺寸、全连接层神经元数目。同时,选择Inception模块平衡网络宽度和深度,防止过拟合的同时提高网络对尺度的适应性。通过输气管道泄漏实验平台模拟工况中常见的阀门泄漏和垫片泄漏,利用短时傅里叶变换进行时频图表征,在此基础上,建立二分类模型和不同泄漏类型的三分类模型。结果表明,相比二分类模型,不同泄漏类型的三分类模型识别准确率有所降低,添加Inception模块可以有效提高三分类模型的性能。     

薄膜生长荧光显微图像实时采集与分析系统

设计了一套具有一定实用意义和科学价值的薄膜生长荧光显微图像实时采集与分析系统,可以实现透明衬底上有机荧光分子薄膜生长的实时原位监测。进一步阐明了系统的硬件构筑思路和软件设计架构,并依据薄膜的形貌特征,给出8个主要生长信息参数及其求取算法,并利用自行搭建的实验系统,针对联六苯(p-6P)分子在云母衬底上的纳米纤维生长过程,得出了其准一维的线性生长规律。该系统作为重要的薄膜生长成像监测技术,有望在薄膜与衬底表面相互作用和衬底微区结构特性研究等方面起到积极的作用。     

Efficient top-emitting white organic light emitting device with an extremely stable chromaticity and viewing-angle

In this paper,we report on the fabrication of a top-emitting electrophosphorescent p-i-n white organic lightemitting diode on the basis of a low-reflectivity Sm/Ag semi-transparent cathode together with a thickness-optimized ZnS out-coupling layer.With a 24-nm out-coupling layer,the reflectivity of the cathode is reduced to 8% at 492 nm and the mean reflectivity is 24% in the visible area.By introducing an efficient electron blocking layer tris(1phenylpyrazolato,N,C2 ’)iridium(III)(Ir(ppz) 3) to confine the exciton recombination area,the current efficiency and the colour stability of the device are effectively improved.A white emission with the Ir(ppz) 3 layer exhibits a maximum current efficiency of 9.8 cd/A at 8 V,and the Commission Internationale de L’Eclairage(CIE) chromaticity coordinates are almost constant during a large voltage change of 6 V-11 V.There is almost no viewing angular dependence in the spectrum when the viewing angle is no more than 45,with a CIE x,y coordinate variation of only(±0.0025,±0.0008).Even at a large viewing angle(75),the CIE x,y coordinate change is as small as(±0.0087,±0.0013).     

一种时序逻辑网络的快速设计方法

引用1984年尹克震提出的“开关函数的反演公式”,采用伪随机序列技术的思想,提出移位寄存器型时序逻辑网络的一种快速设计方法。     

渐变折射率光纤标量近似的微扰修正方法

在弱波导近似下,计及了折射率梯度的影响,把▽ε看作微扰项,应用微扰理论,给出了修正到任一级近似的标量场方程,建立了一级修正解的一般表达式,并给出了相关参量的确定方法。最后,以抛物线折射率剖面单模光纤为例,给出了简要分析结果。     

Xe偶－偶同位素低激发态性质的IBM2描述

通过考虑同类核子相干对Ｓρ、Ｄρ间的四极相互作用，在ＩＢＭＺ中对Ｘｅ偶一偶同位素１１６Ｘｅ—１３２Ｘｅ的低激发态能谱和Ｅ２跃过几率进行了理论分析．计算结果有效地改善了ＩＢＭ中这些核的准γ带能谱的Ｓｔａａｓｅｒｉｎｇ现象，较精确地描述了实验观察到的低激发态的性质．     

Structural Stability of CaCuMn6O12 under High Pressure and Low Temperature

In situ high pressure energy-dispersive x-ray synchrotron radiation diffraction and resistance experiments are carried out on CaCuMn6O12. Its crystal structure is stable in the measured pressure range. The equation of state of CaCuMn6O12 is obtained from the V/Vo - P relationship （V and Vo are the volumes at pressure P and at atmosphere）. The bulk modulus Bo is calculated based on the Birch-Murnaghan equation. Low temperature x-ray diffraction shows no phase transition occurring down to 160K.     

Local Modulation of Double Electromagnetically Induced Transparency Spectrum

The double electromagnetically induced transparency induced by two coupling fields can be realized in a fourlevel tripod-type atom. Such double transparency spectra can be locally modulated by using the weak coherent fields to perturb the coupling transitions. These investigations within this scheme can be independent of Doppler broadening by properly orienting these fieds.     

风险敏感性控制在CEV模型的应用研究

假设股票的价格遵循CEV过程,经济因子满足两个相互独立的布朗运动,运用风险敏感性随机最优控制理论得到新的结论,最后对于简化的模型,得到最优长期增长率的解析解.