液晶屏线路中导电粒子压合的自动光学检测研究

在薄膜晶体管液晶显示器线路检测中,常通过对线路中的导电薄膜粒子的计数和定位实现其导电性的自动检测。为了解决窄边框线路中粒子密度增大带来的粒子重叠问题,提出一种采用微分干涉成像和掩模法结合k均值聚类的算法,在分离出粒子的亮、暗部后,结合图像熵值和粒子的凸性准确分割出粒子。讨论了聚类簇选值的影响,通过不同粒子密度、不同粒子尺寸的样本检验本文算法,并与以往的梯度结合灰度的方法进行对比。结果表明:本文算法在粒子密度较小的区域能达到92.6%的识别率,在粒子密度较大的区域也能达到86%的识别率,分别比梯度加灰度的方法提高了9.9%和42.7%。解决了粒子重叠的问题,并且对光场和成像效果有更好的鲁棒性。     

Phenolic Resin/Octa(aminophenyl)-T<Subscript>8</Subscript>-Polyhedral Oligomeric Silsesquioxane (POSS) Hybrid Nanocomposites: Synthesis,Morphology, Thermal and Mechanical Properties

Octa(aminophenyl)-T₈-polyhedral silsesquioxane, 1, can serve as a cross-linking agent for organic polymeric resins. Amino functional groups of 1 can form chemical bonds or hydrogen-bonds to appropriate matrix polymers or resins. Various resole phenolic resin/1 nanocomposites (0, 1, 3, 6, and 12 wt% 1) were prepared. Hydrogen bonding between phenolic hydroxyls and the amino groups of 1 in these nanocomposites were investigated by FT-IR. The aggregation morphologies of 1 within these samples were examined using SEM, TEM, and Wide Angle X-ray Diffraction (WAXD) studies. Small quasispherical nanometer-sized POSS particles which were further aggregated into clusters, like individual grapes in a bunch, formed into phase-separated domains as large as 400 nm in diameter as the loading of 1 increased. These particles exhibited a broad 2θ = 5.8° WAXD peak indicating the presence of some crystalline order within the nanoparticles of 1 making up the aggregates. This corresponds to an average crystalline plane lattice distance of 17.5 Å. However, extraction of the finely powdered nanocomposites by refluxing THF failed to remove 1 indicating the vast majority of 1 must be chemically bound. Thus, the aggregates must have resin within their structure. The storage modulus (E') in both the glassy and rubbery regions, thermal stability, and glass transition temperature of the composites were improved by 1 wt% 1. However, at high loadings of 1, these properties gradually decreased. Surface extractions by THF removed only a portion of the 1 in the surface regions based on X-EDS analyses for Si, suggesting that a portion of 1 might chemically bond into the phenolic resin matrix during the cure. As the loading of 1 increased, the content of 1 at specific surface locations gradually tends to increase and confirmed excellent dispersion of 1 in the micron size-scale at all locations.     

POSS改性有机玻璃研究进展

目的 多面体低聚倍半硅氧烷(POSS)/聚合物复合材料是近年来材料科学领域研究的热点.把具有特殊笼型结构的新型有机-无机纳米粒子POSS用于改性有机玻璃(PMMA),可以提高PMMA的热学、力学和阻燃等性能,从而提升PMMA的使用效能,拓宽其应用领域.方法 通过对文献进行分析,阐明POSS的合成方法、特性和应用,并全面综述POSS改性PMMA的应用研究进展.结论 分析了目前POSS改性PMMA相关研究的不足,并提出了POSS改性PMMA拓展代替钢化玻璃应用于高层建筑和传统透明材料应用包装领域拟解决的关键问题.     

热带边部减薄及凸度控制技术结合的探讨

热轧带钢生产技术对产品厚度、宽度、凸度和中直度已能较好地控制以后,带钢边部减薄（塌边缺陷）的问题越来越受到重视。通过分析各种轧机机组的特点,认为采用CVC轧机或PC轧机与K－WRS轧机结合的技术,既可以大幅度地控制热轧带钢的凸度和平直度,又能消除边部减薄,在获得高质量产品的条件下,可实现更大的自由规程轧制。     

基于BP神经网络的条带刚凸特征回弹预测

为了研究核燃料组件格架的条带刚凸特征的回弹量与压边力、冲压速度、凸凹模间隙、摩擦系数等冲压工艺参数之间的关系,首先,获取包含50个GA拉丁超立方抽样的数据点以及10个随机抽样的数据点的数据集,前者作为训练集、后者作为测试集。将前者输入到BP神经网络进行训练,后者验证训练模型的精度。最后,通过响应面图研究各因素之间的交互作用以及各因素的敏感程度。结果表明:BP神经网络能够有效预测刚凸回弹量与冲压工艺参数之间的关系,相对于其他因素,压边力对回弹量的影响特别明显,冲压速度对回弹量的影响不明显,但与凸凹模间隙和摩擦系数有明显的交互作用。     

计及网损的快速经济调度方法

若网损近似为常数,对机组费用曲线满足凸特性的经济调度可解析求解,而网损实际是随机组功率变动而变动的,使这一解析求解的方法不能直接使用。对此,借助网损与机组功率间存在的线性凸特性的规律,依据潮流方程,提出网损随机组功率变动的快速经济调度算法,该算法将网损变动的经济调度问题转化成网损不变经济调度可解析的序列组合,使其在单调有限次代数计算后获得经济调度最优解。     

多面体低聚倍半硅氧烷纳米杂化材料制备方法研究进展

多面体低聚倍半硅氧烷(POSS)作为一种新型的有机-无机纳米杂化材料,在现代材料科学中显示出潜在的使用价值。不同取代基的POSS具有不同的反应活性,因此制备POSS基纳米复合材料的方法层出不穷。综述了以物理共混法和化学合成法制备POSS基纳米复合材料的研究进展,并展望了今后POSS基纳米杂化材料的发展前景。     

多面体低聚倍半硅氧烷晶粒诱导的聚乳酸结晶行为及性能

通过溶液及熔融两步共混方法,用带有环氧基的多面体低聚倍半硅氧烷(EVOS)对聚乳酸(PLA)进行改性,并对复合材料的力学性能、结晶性能和相态等方面进行了表征。实验结果表明,随着EVOS的加入,PLA冷结晶温度降低,结晶和熔融温度变化不大,结晶热和熔融热下降。1%的EVOS在PLA中实现了纳米尺度的分散,随着EVOS含量增加,球晶尺寸明显增加。当EVOS的添加量为5%时,材料的拉伸强度比纯PLA增加26.2%,达到最大值。     

一类三次曲线的形状分析

基于包络理论与拓扑映射的方法,对一类带有形状参数的三次曲线进行了形状分析,得出了曲线上含有奇点、拐点和曲线为局部凸或全局凸的充分必要条件,这些条件完全由控制多边形和形状参数所决定。进一步讨论了形状参数对形状分布图的影响及其对曲线形状的调节能力。