基于OpenCV的照度不均匀图像的阈值分割

介绍了一种利用开源视觉库OpenCV在Visual Studio 2005环境下实现图像阈值分割的方法。首先利用双立方插值法估算图像的光照分布,去除不均匀光照,再利用Otsu方法对图像进行阈值分割。实验表明,对传统阈值分割法难以处理的不均匀光照图像能达到良好的分割效果。     

锅炉化学清洗缓蚀效果的研究

采用HCl-IMC-NH4F体系,对模拟锅炉进行化学清洗,当HCl质量分数为5%,IMC-5质量分数为0.3%,NH4F浓度为3g/L,温度为60-80℃时,清洗5h,缓蚀效率达99%以上。     

大型硫磺制酸装置建设的体会

介绍400kt/a硫磺制酸装置的建设体会，包括设计方案确定、工程建设的网络化管理及工程质量控制。装置如期投资，运行稳定可靠。     

Preparation,properties, and anticorrosion application of poly(methyl methacrylate)/montmorillonite nanocomposites coating on brass via solution polymerization

The aim of this study is to improve the anticorrosive property of 7Cu3Zn brass. The methyl‐methacrylate (MMA) monomer solution, modified with fluorine radical and silicone, was used as the polymer matrix to mix with the different percentages of modified montmorillonite (MMT) loading and to exfoliate the lamellar structure of MMT on a nanometer scale during the solution polymerization process, and then form a thin nanocomposites coating on brass as a protective layer. The structural characterization was examined using Fourier transform infrared spectroscopy, X‐ray diffraction (XRD), and transmission electron microscope (TEM). The anticorrosive property of nanocomposites was evaluated using potentiodynamics polarization and electrochemical impedance spectra. The results show that the d‐spacing of MMT was increased, and both exfoliation and intercalation microstructure were observed. Moreover, with the MMT loading increase, the appearance of the intercalation microstructure was more remarkable as a result of silicate layers aggregation. The 1.0 wt %‐coated brass coupons presented the optimistic property of anticorrosion, whose oxygen permeability, corrosion current (i_corr), polarization resistance (R_p), and corrosion rate (R_corr) were 3.5 g/(m²°h), 6.86 nA/cm², 5.81 × 10⁵ Ω°cm², and 0.103 × 10^?3 mm/year, respectively. These results indicate that nanocomposites have potential for anticorrosion application. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 4135–4143, 2007     

褐煤半焦中挥发分对半焦脱灰效果的影响

以云南弥勒褐煤为原料，采用中低温干馏对褐煤进行炭化处理，使褐煤中的大部分水分和挥发分气化除去得到褐煤半焦．控制褐煤炭化条件——炭化终温、炭化时间，得到挥发分含量不同的褐煤半焦，采用絮凝法脱灰，研究半焦的脱灰效果，得到适合脱灰的合理的半焦成分．脱灰后将低灰半焦压制成型，可代替木炭作为硅冶炼还原剂，解决木炭资源缺乏的问题．     

一种新型添加剂在降低卷烟主流烟气一氧化碳中的应用

用 60 %的酒精按重量比 1 0 :1萃取天然食品原料柠檬油或甜橙油中水溶性的香味物质 ,与钾盐一起配成溶液 ,作为卷烟添加剂使用到卷烟中 ;卷烟主流烟气中一氧化碳含量采用非散射红外法测定。结果表明 :本添加剂能有效降低主流烟气中一氧化碳含量 ,并能较好地维持卷烟原有的风味 ,是值得推广应用的一种新型卷烟减害添加剂。     

Synthesis and characterization of 2-cetyl-3-20 keto acid(N-ethyl perfluorinated octyl sulfonamide) N-ethyl ester

2-Cetyl-3-20 keto acid(N-ethyl perfluorinated octyl sulfonamide) N- ethyl ester was synthesized by the reaction of N-ethyl-N-hydroxyethyl perfluorinated octyl sulfonamide and alky ketene dimer. The experimental results show that the yield of products can be 89% when the molar ratio of perfluorinated octyl sulfonamide to ketene dimer is 1:1.1 and the reaction lasts about four hours at 80 °C. The structure of the product was characterized by FTIR and ¹HNMR. The product can dissolve in polar solvents such as NMP, DMAC, THF, DMSO, CHCl₃, and 10% weight-loss temperature measured by TGA is 202 °C. Funded by the National High-Tech Foundation(No. 2003 AA305920)     

数字签名技术在检察机关电子政务中的研究与应用

数字签名技术原理中的椭圆曲线与其他密码体制相比具有很强优越性,其应用前景很广阔。本文重点讨论基于椭圆曲线数字签名算法（ECDSA）在检察机关电子政务中的应用,通过将ECDSA算法应用到XML数字签名方案中,最后这套方案在检察机关电子政务系统中得到了实际应用。     

端羟基丁腈橡胶的合成

在１０Ｌ和５０Ｌ不锈钢聚合釜中，以合成端羟基丁腈橡胶（ＨＴＢＮ）为目的，用Ｈ２Ｏ２作引发剂、乙醇作溶剂，研究了本二烯（Ｂｄ）和丙烯腈（ＡＮ）的溶液共聚合。结果表明，在ＡＮ／Ｂｄ为１０／９０，１５／８５，２０／８０，Ｈ２Ｏ２用量为４．０／８．０ｇ，乙醇用量为７０－８０克，１１０－１２０℃和１２０－１５０ｍｉｎ的聚合条件下，可以得到Ｍ。为２３００－４２００、羟值（ＫＯＨ）为４０．０－８０．０ｍｇ／ｇ、     

Singular points detection based on multi-resolution in fingerprint images

The singular points of fingerprints, namely core and delta, play an important role in fingerprint recognition and classification systems. Several traditional methods have been proposed; however, these methods cannot achieve the reliable and accurate detection of poor-quality fingerprints. In this paper, an algorithm is proposed which combines improved Poincaré index and multi-resolution analysis to detect singular points. Conventional Poincaré index method is improved on the basis of the Zero-pole Model analysis to detect singular points with different resolutions. A model is presented to extract the multi-resolution information of the fingerprint pattern; this model divides fingerprint image into nonoverlapping blocks corresponding to different block sizes on the basis of wavelet functions to compute multiple resolution directional fields, and block position shifting is performed on these resolution levels to capture the features of the ridge direction patterns, where the corresponding shifting intervals are based on Sampling theorem. The relationship of singularities detected by improved Poincaré index in different resolution directional fields is used to confirm singular points accurately and reliably. The combination of local and global information makes our algorithm more robust to noise than methods that use local information only, and the existence of this algorithm increases the insight into the nature of singular points extraction. The accuracy and reliability of the method are demonstrated by experiment on database NIST-4, public fingerprint databases FVC02 DB1 and DB2.