A Quantum Watermark Protocol

Quantum watermarking is the technique which embeds the invisible quantum signal such as the owner’s identification into quantum multimedia data (such as audio, video and image) for copyright protection. In this paper, a watermark strategy for quantum images is proposed based on flexible representation for quantum images (FRQI). Compared with the former strategy, which can only be used to verify the identity of the true owner of a carrier image, the proposed method can be used to find out who is the real owner, and our strategy’s capacity reaches the largest. It is impossible for anyone except the copyrighter to clear off or extract the watermark images.     

Immunoassays Based on Surface-Enhanced Fluorescence using Gap-Plasmon-Tunable Ag Bilayer Nanoparticle Films

A novel gap-plasmon-tunable Ag bilayer nanoparticle film for immunoassays is demonstrated. Different from a traditional Ag monolayer nanoparticle film, a desired number of polyelectrolyte (PEL) layers are deposited on the nanoparticles before the self-assembly of a second Ag nanoparticle layer. Interestingly, by controlling the number of the PEL interlayers, the gap plasmon between the two Ag nanoparticle layers can be tuned across the visible spectral range. The ability of the presented Ag bilayer nanoparticle films in fluorescence enhancement has been examined experimentally. A maximal enhancement of around 15.4 fold was achieved when 7 layers of polyelectrolyte were used. When this optimal Ag bilayer nanoparticle film was applied to fluorescence immunoassay, a performance with approximately 3.3-fold enhancement was obtained compared with that performed on a traditional glass substrate. The experimental results suggest that the presented gap-plasmon tunable Ag bilayer nanoparticle films have great potential in fluorescence-based immunoassays. The method of the bilayer-film construction presented here also provides new insights into the rational design of the plasmonic substrates.     

Novel method for laser focal point positioning on the cover slip for TPP-based microfabrication and detection of the cured structure under optical microscope

Detection of a single cured structure in two-photon photopolymerization (TPP) based microstructure fabrication requires the laser focal spot to be exactly positioned on the cover slip. This is due to the fact that if the laser focal position is not exactly on the cover slip, the structure may not stick to the cover slip and flow away with the liquid during the washing and developing stages. In this paper, we report a scheme of laser spot positioning for the implementation of TPP process and the detection of a single cured microstructure under an optical microscope. For this, a novel yet very simple approach is devised and an uncomplicated procedure is developed. Experimental results are also included to prove the worthiness of the devised method.     

大气遥感远紫外光谱仪绝对光谱辐照度响应度定标方法研究

主要针对可应用于空间高层大气遥感的远紫外光谱仪的光谱辐照度响应度定标方法进行研究。针对远紫外波段光谱测试标准装置少,实验系统所需真空度高,实验稳定性难以维持,传统漫反射板和积分球辐亮度定标方法在远紫外波段局限性大、难以利用等特点,研究了适用于远紫外光谱仪器的光谱辐照度绝对辐射定标方法,搭建了相应的真空实验系统,以一台远紫外光谱仪原理样机为对象对研究方法进行了实验验证。实验系统以标准氘灯、真空紫外单色仪和准直系统组成照射系统,将出射准直光辐照度用标准探测器进行标定,三者共同组成了标准光谱辐照度光源;利用该光源照射原理样机并读出相应信号,最终获得光谱辐照度响应度,从而实现了利用标准探测器进行照度传递的远紫外光谱仪器绝对光谱辐射定标,有效的进行了仪器定标。该方法定标不确定度约为7.7%,对远紫外波段空间高层大气遥感光谱仪的地面辐射定标研究具有重要意义。     

110kV冷绝缘高温超导电缆在故障电流下的温度计算与分析

研究了110kV冷绝缘高温超导电缆失超时,故障电流的分流情况,并以此为依据,建立了电缆在故障电流下失超时,温升与时间关系的计算模型;通过MATLAB对计算模型进行了求解,并对求解结果进行了分析;计算出了电缆在不同故障电流下,温度上升到不同值所需要的时间,进一步明确了故障电流的大小对电缆温升的影响。     

常压介质阻挡放电的特性研究及应用前景

常压介质阻挡放电由于其具有均匀、散漫、稳定,而且不需要真空系统等优点,正日益受到人们的重视和研究。文章给出了常压介质阻挡放电的研究进展,包括实验装置、实验条件、放电机理以及最新的诊断方法,还介绍它在材料表面改性、环境工程、食品加工等方面的应用前景。     

热泵热水器变工况性能的无量纲对比态分析法

本文介绍一种热泵热水器性能的无量纲对比态分析法,该方法采用不同工况的热泵热水器性能参数与标准设计工况的参数对比的无量纲参数来描述实际工况性能。分别导出了理论和实际的描述热泵热水器变工况性能的无量纲表达式,给出了环境气温从-5～40℃,进水温度从5～30℃的无量纲性能曲线,以及两种型号的实验机的结霜温度区的实验结果无量纲对比性能。研究发现,热泵热水器的对比热水流量m_w是体现变工况性能的极为敏感和重要的参数,只有用m_w和COP相结合,才能全面反映热泵性能。     

直流稳压电源波形演示器制作说明

直流稳压电源可以将交流电压变换为直流电压,并使之稳定,在我们现实生活中应用很广泛,在实验中我们利用的电学知识,设计制造了一种直流稳压电源。本文简要介绍了这种直流稳压电源波形演示器的设计目的和电路原理,重点阐述了它的制作流程、滤波和稳压原理以及性能测试输出波形。     

有ITO透明导电膜的平面分层介质系统的电磁波性能理论研究

理论研究了有ITO(indium tin oxide)透明导电膜的多层平面分层介质系统的电磁性能，给出的理论曲线和实测曲线符合很好.多层平面分层介质系统的电磁性能与ITO膜(方块电阻为8Ω)所在界面位置和平面分层介质系统层数及各层厚度等有关.优化设计了一种含有ITO透明导电膜的厚度仅7.35mm的四层平面分层介质系统，其在8—18GHz频段内电磁波反射性能很好.作为多层平面分层系统中的ITO导电膜，其方块电阻应低于30Ω，并且越小，其反射性能越好. 关键词： 多层平面介质系统 电磁性能 ITO透明导电膜