Automatic recognition of serial numbers in bank notes

This paper presents a new topic of automatic recognition of bank note serial numbers, which will not only facilitate the prevention of forgery crimes, but also have a positive impact on the economy. Among all the different currencies, we focus on the study of RMB (renminbi bank note, the paper currency used in China) serial numbers. For evaluation, a new database NUST-RMB2013 has been collected from scanned RMB images, which contains the serial numbers of 35 categories with 17,262 training samples and 7000 testing samples in total. We comprehensively implement and compare two classic and one newly merged feature extraction methods (namely gradient direction feature, Gabor feature, and CNN trainable feature), four different types of well-known classifiers (SVM, LDF, MQDF, and CNN), and five multiple classifier combination strategies (including a specially designed novel cascade method). To further improve the recognition accuracy, the enhancements of three different kinds of distortions have been tested. Since high reliability is more important than accuracy in financial applications, we introduce three rejection schemes of first rank measurement (FRM), first two ranks measurement (FTRM) and linear discriminant analysis based measurement (LDAM). All the classifiers and classifier combination schemes are combined with different rejection criteria. A novel cascade rejection measurement achieves 100% reliability with less rejection rate compared with the existing methods. Experimental results show that MQDF reaches the accuracy of 99.59% using the gradient direction feature trained with gray level normalized data; the cascade classifier combination achieves the best performance of 99.67%. The distortions have been proved to be very helpful because the performances of CNNs boost at least 0.5% by training with transformed samples. With the cascade rejection method, 100% reliability has been obtained by rejecting 1.01% test samples.     

基于风险的区域水安全评价模糊数随机模拟模型

针对用三角模糊数定量描述水安全系统各指标的风险等级和风险重要性的现有方法的运算尚不够严谨,实现过程较为复杂,所得综合风险评价值只是一实数值,没有指明综合风险评价值本身所具有的不确定性等问题,在基于系统脆弱性的区域水安全风险评价指标体系建立的基础上,采用随机模拟方法模拟三角模糊数,把三角模糊数及其函数之间的运算简化为普通的实数之间的运算,建立了基于三角模糊数随机模拟的水安全系统综合风险评价模型（RWSA-SSTFN）。研究表明,以置信区间形式表示的RWSA-SSTFN评价结果比现有常规方法在可靠性方面提供了更多信息,能反映受多种不确定性因素综合影响的水安全系统综合风险评价的客观实际情况;RWSA-SSTFN概念直观,方法简便通用,在具有随机性、模糊性和数据资料不精确等多种不确定性因素综合作用的各种资源环境安全系统综合风险评价问题中具有推广应用价值。     

高、低能X射线数字成像内视仪的研制

提出了利用闪烁屏和科学级CCD相机研制适用于高、低能工业X射线成像检测内视仪的方法。结合科研工作中对内视仪性能的要求，研究了闪烁屏和科学级CCD的性能，设计了CCD的驱动电路、制冷电路和微机EPP方式远距离数据快速采集电路和相应软件。研制了完整的仪器并进行了实验，和常用的X射线数字成像系统相比，具有对比灵敏度和空间分辨率高，图像质量好的特点。     

桩端岩土差异对超长桩影响的对比研究

分析了3种类型桩端岩土有差异的8根超长灌注桩的对比试验资料，包括进入基岩和不入基岩的对比试验桩各1根，桩端有沉渣和无沉渣的对比试验桩各1根，桩端沉渣厚度不同的对比试验桩各1根，桩端有无高压注浆的对比试验桩各1根。分析结果表明，桩端岩土由软层转向硬层时，超长桩的荷载．沉降曲线会由陡直转向平缓，极限状态时的破坏由趋于刺入破坏转向趋于整体剪切破坏，桩型由纯摩擦桩转向端承摩擦桩，说明桩端岩土特性对超长桩的承载性状有大的影响；桩端岩土由软层转向硬层时，桩极限承载力的提高主要体现在极限端阻力的提高，极限端阻力的提高可用含端阻力增强系数的公式来表示：桩端高压注浆超长桩还可看成是超长扩底桩，它的极限端阻力除可用端阻力增强系数表达外，也可暂用一般扩底桩极限端阻力的形式来表达：入硬层超长桩(如长径比为82时)还可是端承摩擦桩，它具有很大的承载潜力，一般认为其端阻力小是因为取的桩顶沉降值过于保守造成的。对入硬层超长桩取较大桩顶沉降值时的桩承载力是可行的，此时只要把相邻桩基础的沉降差控制在一定的范围内，使之不产生过大的不均匀沉降即可。     

Small target detection combining regional stability and saliency in a color image

In this paper, we will address the issue of detecting small target in a color image from the perspectives of both stability and saliency. First, we consider small target detection as a stable region extraction problem. Several stability criteria are applied to generate a stability map, which involves a set of locally stable regions derived from sequential boolean maps. Second, considering the local contrast of a small target and its surroundings, we obtain a saliency map by comparing the color vector of each pixel with its Gaussian blurred version. Finally, both the stability and saliency maps are integrated in a pixel-wise multiplication manner for removing false alarms. In addition, we introduce a set of integration models by combining several existing stability and saliency methods, and use them to indicate the validity of the proposed framework. Experimental results show that our model adapts to target size variations and performs favorably in terms of precision, recall and F-measure on three challenging datasets.     

肉制品主要组分对Surfactin抑制蜡样芽孢杆菌芽孢效果的影响研究

高温杀菌后的肉制品在贮藏货架期中发生腐败变质,主要原因是由于其中残存少量芽孢导致的,为了最大限度保障肉制品的安全,探讨Surfactin对芽孢的灭活效果。研究肉制品不同组分对Surfactin抑制芽孢的影响,旨在为其科学使用奠定理论依据。通过设计肉制品中常见食品组分NaCl、蛋白质和脂肪的不同浓度,检测残存芽孢存活数量,评价不同浓度Surfactin对蜡样芽孢杆菌芽孢存活的抑制效果。研究结果表明,NaCl、牛血红蛋白、亚油酸对Surfactin灭活蜡样芽孢杆菌芽孢有不同程度的影响。在低浓度Surfactin时,低浓度NaCl(1%)有保护芽孢不被灭活效应,而高浓度NaCl(3%~9%)则有促进芽孢被灭活效应,显示出协同效应。而在高浓度Surfactin时,只有9%NaCl浓度显示出协同效应。蛋白质表现出一定程度的保护作用,脂肪只有在高浓度组(25%以上)才显示出对芽孢的保护效应。     

空气幕隔离法通风除尘技术在落砂机上的应用

采用“空气幕隔离法通风除尘技术”，成功地治理了铸造车间震动落砂机工作时产生含有ＳｉＯ２粉尘的污染问题，取得了理想的使用效果。     

枪械的点射精度与模拟试验枪架

设计能近似模拟人体特性的模拟试验枪架以排除射手的主观神经——心理影响对客观反映枪械的点射性能有重要意义 .本文介绍了模拟试验枪架的设计思想及其性能特点 ,并根据对不同枪械进行对比射击实验的结果 ,对模拟枪架的性能、点射精度的概念及评定不同枪械点射性能优劣的方法进行了讨论 .     

Magnetic resonance imaging of glioma with novel APTS-coated superparamagnetic iron oxide nanoparticles

We report in vitro and in vivo magnetic resonance (MR) imaging of C6 glioma cells with a novel acetylated 3-aminopropyltrimethoxysilane (APTS)-coated iron oxide nanoparticles (Fe₃O₄ NPs). In the present study, APTS-coated Fe₃O₄ NPs were formed via a one-step hydrothermal approach and then chemically modified with acetic anhydride to generate surface charge-neutralized NPs. Prussian blue staining and transmission electron microscopy (TEM) data showed that acetylated APTS-coated Fe₃O₄ NPs can be taken up by cells. Combined morphological observation, cell viability, and flow cytometric analysis of the cell cycle indicated that the acetylated APTS-coated Fe₃O₄ NPs did not significantly affect cell morphology, viability, or cell cycle, indicating their good biocompatibility. Finally, the acetylated APTS-coated Fe₃O₄ nanoparticles were used in magnetic resonance imaging of C6 glioma. Our results showed that the developed acetylated APTS-coated Fe₃O₄ NPs can be used as an effective labeling agent to detect C6 glioma cells in vitro and in vivo for MR imaging. The results from the present study indicate that the developed acetylated APTS-coated Fe₃O₄ NPs have a potential application in MR imaging.