彩色液晶显示用彩色滤色膜的光学与色度特性

利用可溶性高聚合物和光感剂材料,采用光刻技术制成了用于彩色液晶显示的彩色滤色膜,并对其进行了光学与色度特性的测量.     

Wavelet-modified binary phase-only morphological correlation for color pattern recognition

This paper reports a morphological phase-only correlation technique based on bit-map representation for recognition of color as well as grey images in a hybrid digital-optical correlation architecture. The color image is decomposed into its R, G and B components, and each component is further decomposed into eight disjoint elementary images depending upon the bit-map representation of the color value at each pixel. Bit-map representation of the pixel values of an image reduces the required computational time. A set of twenty-four disjoint wavelet-modified binary phase-only filters (WBPOFs) are generated from these bit-map decomposed images. The target image is similarly decomposed into eight disjoint images each of R, G and B and their digital Fourier transforms multiplied with the corresponding WBPOFs. The product functions thus obtained are added up to form a single resultant product function, whose optical Fourier transformation gives the correlation peaks for the presence of R, G and B components in the image. The single product function overcomes the necessity of obtaining the final optical Fourier transformation of the R, G and B components separately. The novelty of this approach lies in the fact that the WBPOFs synthesized by this procedure are thus able to identify both colored as well as gray images and can tolerate salt-and-pepper noise to a considerable extent.     

高灰度分辨率图像的伪彩色编码

提出了一种基于RGB三基色系统的对高灰度分辨率图像进行伪彩色编码的非线性方法。在该方法中 ,对小于 2 4位灰度分辨率的图像来说 ,任一空间 (x ,y)处的灰度值 f(x ,y)均可用 2 4位二进制数 fi(i=0 ,1,… ,2 3)来表示。通过Ri=f3i,Gi=f3i+1,Bi=f3i+2 (i =0 ,1,… ,7)进行非线性编码 ,得到 3个 8位二进制数R ,G和B ,将其分别乘以KR,KG和KB 规模因子后 ,作为RGB三基色系统的三色系数 ,实现了灰度图像的等密度伪彩色编码。该方法通用性强 ,可实现 1位到 2 4位灰度图像的伪彩色编码 ,并且处理高分辨率灰度图像与处理低分辨率灰度图像的方法是一致的 ,速度也是相同的     

应用数码相机进行绿肥翻压后春玉米氮素营养诊断和产量预测

在绿肥翻压条件下,常规的玉米氮素营养诊断技术存在耗时、费力和可靠性差的缺点。基于数码相机的可见光光谱技术已被广泛应用于大田作物的氮素营养诊断,但尚未见应用于绿肥翻压后的玉米氮素营养诊断。为评价利用图像处理技术进行绿肥翻压后玉米氮素营养诊断和玉米产量预测的可行性,设置了不同施氮水平下的绿肥翻压试验,利用数码相机获取不同生育期玉米冠层数字图像,分析了玉米冠层图像色彩参数与氮素营养诊断指标和成熟期籽粒产量之间的关系。结果表明,绿肥翻压显著改善了玉米的氮素营养,不同生育期的玉米叶绿素含量(SPAD值)、地上部生物量和吸氮量均高于单施化肥处理;绿肥翻压处理下,玉米冠层光谱指数与氮素营养指标间的相关性较单施化肥处理低,且其相关性在不同的生育期有较大变异,其中,12叶期(V12)的蓝光标准化值(B/(R+G+B))与灌浆期(R4)的红光标准化值(R/(R+G+B))与植株氮营养指标相关性较好,二者均与玉米产量间呈显著直线回归关系,回归系数分别为45%和46%。因此,数字图像技术在进行绿肥翻压后玉米氮素营养的诊断和产量预测方面具有应用潜力,但应注意诊断时期和关键指标的选择。     

吖啶橙-罗丹明6G能量转移荧光猝灭法测定维生素B12

研究了吖啶橙(AO)与罗丹明6G(R6G)间发生能量转移的最佳条件,在pH5·0的Na2HPO4-柠檬酸缓冲溶液,十二烷基苯磺酸钠介质中,AO-R6G间发生有效能量转移,使R6G荧光大大增强。维生素B12(VB12)的加入使AO-R6G体系的荧光猝灭,以此建立了利用AO-R6G能量转移荧光猝灭法测定维生素B12的新方法。在优化的实验条件下,维生素B12工作曲线的线性范围为:0~3·0×10-5mol·L-1;检出限为:4·8×10-7mol·L-1;平行6次测定相对标准偏差为0·51%~0·64%;回收率为98·40%~103·62%。该方法的稳定性好,选择性高,用于维生素B12注射液中维生素B12含量的测定,结果满意。     

三片式液晶投影仪的立体视觉研究

基于对三原色信号进行偏振特性的分析,提出了一种在三片式液晶投影显示设备上实现立体显示的新方法。该方法利用红色和蓝色信号光与绿色信号光在偏振方向上正交的特性,在信号通道之间引入视差,实现了三维立体显示。因此这种方法被称为补色偏振体视。介绍了该方法的基本原理,并详细叙述了用PHOTOSHOP软件制作补色偏振立体图对的方法。     

Physics beyond Standard Model: Working group 3 report

This is a summary of the beyond the Standard Model (including model building) working group of the WHEPP-X workshop held at Chennai from January 3 to 15, 2008. Participants: Neelima Agarwal, S K Agarwalla, C S Aulakh, A Belyaev, S S Biswal, B Bhattacharjee, G Bhattacharyya, L Calibbi, D Choudhury, E J Chun, D Das, A De Roeck, N G Deshpande, E Dudas, A Giri, D Grellshceid, R Godbole, S Goswami, M Guchait, M Hirsch, R Kaul, B Kodrani, M C Kumar, A Kundu, Y Mambrini, P Mathews, B Mellado, R Mohanta, S Mohanty, A Nyffeler, S Pakvasa, M K Parida, M Passera, C Petridou, S Poddar, P Poulose, A Rajaraman, G Rajasekaran, V Ravindran, Kumar Rao, D P Roy, Probir Roy, K A Saheb, V H Satheeshkumar, T Schwetz, A Tripathi, R Vaidya and S Vempati     

掺杂8－羟基喹啉铝薄膜的电致发光特性研究

在具有电致发光（ＥＬ）的有机整合染料８－羟基喹啉铝（Ａｌｑ３）中接以染料罗丹明６Ｇ（Ｒ６Ｇ）,用真空热蒸发的方法制备器件,获得了峰值波长５７５ｎｍ的黄色直流薄膜电致发光,从而通过掺杂改变了发光颜色．并在Ａｌｑ３发光层不同区域插入一掺杂薄层（Ａｌｑ３：Ｒ６Ｇ）,利用其发光波长与未掺杂部分（Ａｌｑ３）的不同,以此作为“探测层”,通过对器件光谱及电学特性的测量与分析,探讨了有关发光区域,发光机理,界面对发光影响等基本问题．     

基于无人机可见光谱平台的烤烟氮素营养诊断

利用不同氮肥用量田间试验,分析基于无人机平台的可见光谱诊断技术对烟草氮素营养进行无损评估预测的可行性,明确该技术的最佳颜色参数和方程模型。2018年在江西省安福县开展田间试验,设置不同氮肥用量,分别为0,45,90,135,180和300 kg N·ha-1,于移栽后47 d（团棵期）、移栽后83 d（旺长后期）和移栽后116 d（下部叶成熟期）,利用无人机获取冠层RGB色彩数字图像,同时采集植株样品分析地上部生物量、叶片生物量、地上部氮浓度、叶片氮浓度、叶片SPAD值等氮营养状况指标,对冠层数字图像进行数字化分析,获得颜色指标值,通过颜色指标与烟草氮营养状况指标的相关性分析,筛选适宜的颜色指标并建立氮营养诊断方程。利用不同地块的氮肥用量试验,对氮营养诊断方程拟合精度进行验证。试验结果表明,旺长后期各处理间冠层图像的颜色标准值存在显著差异,团棵期与下部叶成熟期不存在显著差异。在10个颜色指标中,NRI,NGI,G/R,G/(R+B),(G-R)/(R+G+B)和ExG与5个烤烟氮素营养指标均达到极显著相关（p＜0.01)。在归一化颜色指标体系、比颜色指标体系和归一化差分颜色指标体系中选择潜在的最佳颜色参数指标分别为NGI,G/R和ExG。根据不同类型的回归分析结果,确定指数回归作为地上部生物量和叶片生物量的预测模型,线性回归作为地上部氮浓度、叶片氮浓度及叶片SPAD值的预测模型。对潜在的最佳指标进行验证性筛选,G/R对地上部氮浓度和叶片氮浓度的RMSE值分别为0.375 1%和0.249 1%,明显低于NGI和ExG,预测精度最高。用G/R值表示的地上部生物量、叶片生物量、地上部氮浓度、叶片氮浓度、SPAD值预测方程分别为Y=21.785e1.3502G/R,Y=4.057 9e1.937 3G/R,Y=5.039 9G/R-3.333 2,Y=4.281 4G/R-3.802 9,Y=40.168G/R-28.188。因此,基于无人机平台的可见光谱诊断技术在烤烟氮素营养诊断方面具有应用潜力,评估最佳时期为旺长后期,最佳预测参数为G/R值。     

对爱因斯坦模型的修正及考虑热效应的三个通用状态方程

 对固体考虑热效应的爱因斯坦模型进行了修正。指出考虑热效应的通用状态方程中不应该包含零点振动项，方程参数不应该直接取为参考温度下的实验值V_R，B_R，B′_R和γ^G_R，而应该取为零温下的数值V₀，B₀，B′₀和γ^G₀；提出了一种从V_R，B_R，B′_R和γ^G_R求解V₀，B₀，B′₀和γ^G₀的方法。将提出的方法应用于三个典型的通用状态方程，包括Baonza、mMNH和Vinet方程。数值结果表明，利用相同的实验参数对三个方程解出的参数，以及预测的零压和低压下的热物理性质差异很小，而且都与实验数据符合很好。这些结果表明，在零压和低压下预测热物理性质的精确度不足以用来判断各种通用状态方程的适用性。     

Effect of temperature on the sliding wear behavior of laser surface alloyed Ni-base on Al-Mg-Si alloy

The surface microstructures of 6061 Al-Mg-Si alloy coated with laser surface alloyed (LSA) Ni-Cr-B-Si powder and their sliding wear performance have been investigated. Experimental results show that there are three regions, as grayish region (G.R.), dark region (D.R.) and bright region (B.R.), in the pool. The Al₃Ni and Al₃Ni₂ compounds appear in the G.R. and D.R., respectively. The Al-Ni-Cr amorphous structure can be observed in the B.R. The hardness of the LSA specimens is much higher than the Al-matrix. Compared with the Al-matrix, the LSA specimens have excellent sliding wear performance. They have lower friction coefficient and wear rate. The critical temperature of sliding wear resistance of LSA specimen is higher than that of Al-matrix by about 50 °C. The stress relief during thermal treatment will slightly reduce the hardness and the wear resistance of LSA specimens, especially at testing temperature >200 °C.     

掺杂8-羟基喹啉铝薄膜的电致发光特性研究

在具有电致发光(EL)的有机整合染料8-羟基喹啉铝(Alq3)中接以染料罗丹明6G(R6G),用真空热蒸发的方法制备器件,获得了峰值波长575nm的黄色直流薄膜电致发光,从而通过掺杂改变了发光颜色.并在Alq3发光层不同区域插入一掺杂薄层(Alq3:R6G),利用其发光波长与未掺杂部分(Alq3)的不同,以此作为“探测层”,通过对器件光谱及电学特性的测量与分析,探讨了有关发光区域,发光机理,界面对发光影响等基本问题.     

A theoretical study of the regio- and stereoselectivities of non-polar 1,3-dipolar cycloaddition reaction between C-diethoxyphosphoryl-N-methylnitrone and N-(2-fluorophenyl)acrylamide

The 1,3-dipolar cycloadditions (13DC) of C-diethoxyphosphoryl-N-methylnitrone and N-(2-fluorophenyl) acrylamide have been studied using density functional theory (DFT) calculations at B3LYP/6-31G(d) level of theory. Our calculations show that this 13DC reaction takes place with complete ortho regioselectivity with endo stereoselectivity, which favours kinetically the formation of the ortho–endo cycloadduct, in agreement with the experimental observations. The inclusion of solvent effects does not modify the gas-phase selectivities but slightly decreases the reactivity of the reagents. Analysis of the bond order and charge transfer at the transition states indicates that this 13DC reaction takes place via a one-step asynchronous mechanism. Analysis of the DFT global reactivity indices and the Parr functions of the reagents allow us to provide an explanation of the regioselectivity of this 13DC reaction.     

Shape Coexistence for 179Hg in Relativistic Mean-Field Theory

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多光谱大面阵彩色CCD数字航测相机设计

针对大比例尺数字航空测量系统的特点,利用系统高度集成技术,研制了一套大像幅,高分辨率、多光谱的数字航空测量系统.该系统的核心是四台面阵CCD相机,其中一台是9k×9k的大面阵CCD相机,获取全色图像;另三台是2k×2k面阵CCD相机分别获取红(Red,R),绿(Green,G),蓝(Blue,B)三个可见光的图像,通过数据融合实现彩色图像的获取.详细阐述了高分辨、多光谱相机的关键技术及其实现方法.该系统在Y-5遥感飞机上进行了搭载飞行实验,对获取的图像进行处理和分析,获得满意的图像,满足了大比例尺数字航空测量要求.     

Color filters featuring high transmission efficiency and broad bandwidth based on resonant waveguide-metallic grating

A one-dimensional transmission color filter based on a resonant waveguide-metallic subwavelength grating was numerically investigated by employing rigorous coupled-wave analysis (RCWA) and genetic algorithm (GA). The hybrid numerical method is used to determine the optimal parameters (the grating period, filling factor, grating thickness, and waveguide thickness) of two waveguide-grating structures, namely a double-layer resonant waveguide-metallic grating and a triple-layer resonant waveguide-metallic grating. The optical responses of these structures are evaluated and compared in terms of the ideal transmission efficiency aiming at the central wavelengths of 645 nm, 546 nm, and 455 nm of red (R), green (G), and blue (B) lights, respectively, over the visible region (380–780 nm). The results show that the optical performance of the double-layer with silver grating achieves the highest transmission efficiency of 82% (R), 81% (G), and 66% (B); and the largest bandwidth of about 125 nm (R), 118 nm (G), and 85 nm (B). Compared with existing color filters, the proposed device not only obtains a higher transmission and broader bandwidth, but it also suppresses redundant spectral peaks and transmission sidebands.     

Top Quark Flavor Changing Decay t

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Understanding the kinetic solvent effects on the 1,3‐dipolar cycloaddition of benzonitrile N‐oxide: a DFT study

The kinetic solvent effects on the 1,3‐dipolar cycloaddition (13DC) of benzonitrile N‐oxide with cyclopentene [T. Rispens and J. B. F. N. Engberts, J. Phys. Org. Chem. 2005; 18 , 908–917] have been studied using density functional theory (DFT) at the B3LYP/6‐31G(d) level. Solvent effects were analyzed by means of the polarizable continuum model (PCM). The analysis of the potential energy surface shows that this reaction follows an asynchronous concerted mechanism. The topological analysis of the electron localization function (ELF) of the turning points along the reaction pathway explains the diradical nature of mechanism of this reaction. Inclusion of solvent effects does not substantially modify this behavior. The present study points out that, contrary to Diels–Alder reactions, the increase in the solvent polarity leads to a slow inhibition of the 13DC reaction, because of the low polarity of the transition state. Explicit solvation involving the coordination of one water molecule to the dipole puts in evidence the importance of hydrogen bonding in the modest acceleration of this 13DC reaction. These results are in good agreement with experimental outcomes. Copyright © 2011 John Wiley & Sons, Ltd.     

Supersymmetric electro-weak effects ong μ−2

A model independent analysis of the super-symmetric electroweak contribution tog _μ?2 is discussed within the framework ofN=1 Supergravity unified theory. A detailed comparison with existing experiment of two models (R.G. and T.B.) is carried out. The supersymmetric electro-weak contributions are found to be characteristically different and generally larger than the electro-weak contributions of the standard theory, and in many cases significantly larger. Effects of the hidden sector and the photino mass dependence ofg _μ?2 are also investigated. Present data already eliminates some choices of parameters. Reduction of existing experimental errors by a factor of 3 will make contact with most R.G. models and by a factor of 10 with most T.B. models.