漂白机械浆白度稳定性的研究进展

综术字国外漂白机械浆稳定性的研究进展,主要包括漂白机浆光致黄化机理的研究动态和漂白机械浆白度稳定性的几技术等。     

基于电视图像的目标识别与目标辐射特性的关系分析

介绍了基于电视图像对目标的识别原理,以及RGB颜色空间向HIS空间和灰度值之间的转换关系,并从理论上计算了信号处理对目标的色调、色度、亮度和反射率变化范围的要求.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

保持图像亮度的自适应局部对比度增强

目前保持亮度的局部直方图均衡算法用于对比度增强时,大多以亮度均值和中值为图像的亮度分割点,这些方法能较好地保持图像的亮度,但同时也会产生局部过增强。为此提出了一种亮度误差最小的自适应局部对比度增强算法,根据亮度均值绝对误差自适应的选择最佳亮度分割点,然后用保持亮度的双直方图均衡算法对被分割的子图像进行均衡,最后用滤波器消除块效应。实验结果表明,该算法不仅保持了输入图像的亮度,同时也实现了局部对比度增强。     

Multi-coating inhomogeneities approach for the effective thermo-electro-elastic properties of piezoelectric composite materials

This work presents a micromechanics-based model to predict the effective thermo-electro-elastic properties of a piezoelectric composite materials containing ellipsoidal multi-coated inhomogeneities. A finite element analysis is also performed for two-phase piezoelectric composite materials using ABAQUS finite element software. The results obtained from the multi-coating homogenization method show good agreement with the existing experimental results and the finite element results. The inhomogeneities’s shape effect as well as the poling direction and the coating effects are investigated. The results show that a proper choice of materials and inhomogeneities’s geometry can lead to the desired thermo-electro-elastic properties.     

Q235钢中温无黄烟化学抛光工艺

低碳钢在双氧水系抛光液中化学抛光时,双氧水易分解,温度不易控制,而在硝酸系抛光液中化学抛光会产生黄烟且能耗较大。为此,研制了一种新型无黄烟低碳钢中温化学抛光液对Q235钢化学抛光,考察了化学抛光液组成及温度、时间对抛光质量的影响。结果表明:使用本工艺的化学抛光试样表面平整、粗糙度低,光亮度达3～4级;获得最佳抛光质量的化学抛光工艺为120～250mL/LH3PO4,100～200mL/LH2SO4,40～80g/LNaNO3,10～40g/LNaCl,20g/L复合添加剂,55～65℃,2～5min。     

能见度自动化计算方法

一种新的基于图像边缘处理的能见度自动计算方法被提出。它首先对大气科学中定义的能见度进行简化,接着对地面标记物边界区域提取边缘梯度、对比度、亮度等图像内在特征并针对这些特征利用简化的能见度定义进行计算,最后根据预定义的阈值定量地判定地面预设标志物的可见性从而实现计算能见度。一个能见度自动计算系统模型被建立,通过实验与实际观察结果的数据对比,验证了其算法的可行性和有效性,与已有算法相比其算法在计算的可靠性和有效性方面具有明显改善。     

对纸浆白度现状的几点看法

提高纸浆的白度对改善纸页的外观及印刷性能等没有什么可置疑的，问题是在提高纸浆白度的背后有一些值得注意的问题，如：漂白化学药剂的过多投入、漂白段数的增加及其相应设备及一些基础设施的增加、纸浆漂白损失的增大以及随之而来的对植物纤维资源的浪费、过多的漂白废液的排放对环境过程造成的负效应等等。困而对纸浆白度的掌握应有一个度的考虑。     

Some effects of sound, background brightness, and economic status on the perceived size of coins and discs.

"Rich" and "poor" children estimated the size of coins and discs under sound vs. no sound conditions and 2 levels of background brightness. Contrary to prediction, no relation was found to exist between sound level and size estimation, although such a relation did exist for background brightness. The findings failed to replicate the data of Bruner and Goodman, whereas they were in substantial agreement with those of Carter and Schooler. These results were as follows: (a) large coins tended to be judged larger, and small coins judged smaller than neutral discs of comparable size; and (b) no differential effect was observed on the stimations of coins and discs as a function of economic status. There was, however, a reliable tendency for the children of lower economic status to everestimate both coins and discs when compared with those of higher status. (17 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Tracking with a differential brightness display: II. Peripheral tracking.

Tracking performances were compared using a differential brightness display (DBD) and a conventional positional display when both displays were moved to the periphery. Results of a previous study and the present study have shown that performance with the positional display was superior to performance with the DBD when the S looked directly at them. As the displays were moved to the peripheral visual areas (15°, 30°, and 45° eccentricity) the reverse of this was true, performances with the DBD were superior. This was reflected both in the actual performance scores and the amount of time S spent looking toward the displays. These results were interpreted in terms of the underlying physiology of the retina and control movements. (PsycINFO Database Record (c) 2010 APA, all rights reserved)