Detecting and measuring rings in banknote images

Various intelligent systems show a rapidly growing potential use of visual information processing technologies. This paper presents an example of employing visual information processing technologies for detecting and measuring rings in banknote images. The size of the rings is one of parameters used to inspect the banknote printing quality. The approach developed consists of two phases. In the first phase, based on histogram processing and data clustering, image areas containing rings are localized and edges of the rings are detected. Then, in the second phase, applying the hard and possibilistic spherical shell clustering to the extracted edge pixels the ring centre and radii are estimated. The experimental investigations performed have shown that even highly occluded rings are robustly detected. Several prototypes of the system developed have been installed in two banknote printing shops in Europe.     

Fabrication of high-performance Y2O3 stabilized hafnium dioxide refractories

Y₂O₃ stabilized HfO₂ ceramics with 5 mol% and 8 mol% Y₂O₃, respectively, were successfully fabricated by pressureless sintering at 1600 °C for 1 h. The phase distribution and transformation, microstructure, and relative density were investigated for Y₂O₃ stabilized HfO₂ ceramics. Cubic phase was observed in the Y₂O₃ stabilized hafnium dioxide while pure HfO₂ showed monoclinical phase only. The SEM images of fractured surface indicated two kinds of structures existed in modified HfO₂, the solid solution region and uniform polygon grains, and some holes caused by Kirkendall effect. Refractoriness test showed that high temperature volumetric stability of the material can be effectively enhanced by adding Y₂O₃ into HfO₂.     

硼酸-柠檬酸法测定苦荞粉中黄酮类化合物的含量

研究了用硼酸-柠檬酸法测定苦荞粉中黄酮类化合物的含量,考察了该方法的稳定性,精密度及回收率情况,并将该方法与硝酸铝比色法进行了比较。结果表明:用硼酸-柠檬酸法测定苦荞粉中黄酮类化合物的含量时稳定性良好,精密高,标准偏差为0.36%,黄酮类化合物的回收率达98.6%,准确度高;相较于硝酸铝比色法操作更方便、简洁和实用,是测定苦荞粉中总黄酮含量的一种实用性较强的方法,利用该方法测得苦荞粉中黄酮类化合物的含量为1.37%。     

弯销和特殊斜销抽芯压铸模设计

铸件带有深腔,开模时铸件容易包紧在定模型芯上,并最终留在定模,给取件带来困难,模具设计时采用了具有延时作用的特殊斜销,消除了铸件对定模型芯的包紧力,从而使铸件留在动模。模具使用情况良好,所生产的零件能满足精度和表面粗糙度的要求。     

核桃营养价值及功能活性研究进展

综述了核桃的营养价值、功能活性的研究进展,并对我国核桃产业发展进行了展望,以期对核桃产业化发展带来新的动力。     

40%戊唑·多菌灵SC的高效液相色谱分析方法

采用高效液相色谱法测定40%戊唑·多菌灵SC,使用C18色谱柱,以V(乙腈)∶V(水)=80∶20为流动相,在柱温45℃、波长277 nm、流速1.0 mL/min的色谱条件下进行分析。戊唑醇和多菌灵的标准偏差分别为0.084和0.075,相对标准偏差分别为0.28%和0.73%,线性相关系数分别为0.9993和0.9995,平均回收率分别为99.36%和99.96%,方法达到了分析的要求。     

基于AHP的市场比较法研究

市场比较法是房地产估价中运用较多的方法之一,文章针对房地产状况修正,分析了AHP在该方法中的应用,实现了合理的确定房地产状况修正因素的权重,使得所确定的比准价格更具有指导意义。     

离心式冷水机组变工况运行性能分析研究

以单级离心式制冷压缩机的性能曲线为基础,分析了单级离心式冷水机组的变工况运行性能,在给定的非标准工况下,综合比较了压缩机-换热器-膨胀节流装置在各种配置下的运行性能.从数据对比,说明电子膨胀阀对于离心式冷水机组的变工况运行适应性最好,手动/半自动可调膨胀节流孔板可兼顾变工况性能与制造成本,而固定式膨胀节流装置从综合能效比来讲运行经济性较差.     

H.264编码技术和发展趋势

自2003年推出H．264视音频编解码标准以来，H．264迅速在Internet网和视音频领域得到普及与推广。阐述H．264的定义、H．264编码技术的主要特点与改进及其应用前景和发展趋势。     

液体原药被制备成农药水乳剂稳定性研究

把液体原药制备成水乳剂时,在乳化剂用量不变的情况下,加入溶剂的多少会影响油相密度、分散液滴的粒径（使用不同乳化剂所受影响程度不同）和水乳分散体系的黏度,进而影响水乳分散体系的稳定性。加入溶剂越多油相密度越小,体系黏度越大,分散液滴的平均粒径越小。因此一般情况下把液体原药制备成水乳剂,溶剂加入多一些,即油相比例大一些,有利于制剂分散体系稳定。