新世纪我国石化工业面临的挑战和对策

叙述我国石化工业的现状，分析存在的差距以及面临的挑战和机遇，并对发展我国石化工业应采取的对策进行了探讨。     

纳米氧化铁化学制备方法研究进展

综述了纳米氧化铁的化学制备方法的研究进展.分析了沉淀法、胶体化学法、溶胶-凝胶法、水热法、水热-反萃法、压力-热晶法、固相法、强迫水解法、冷冻干燥法等不同方法制备超细氧化铁的优缺点.针对目前制备氧化铁存在的一些问题,提出了纳米氧化铁制备应向低成本、粒径可控、颗粒均匀的方向发展.     

积极发展高附加值产品业务是我国石化企业提高市场竞争力的战略选择

阐述了我国石化工业面临的新机遇和新挑战,介绍了国外石化企业发展高附加值产品概况,对我国石化企业如何发展高附加值产品进行了全面分析和思考。     

A dual color images watermarking scheme based on the optimized compensation of singular value decomposition

This paper proposes a novel watermarking algorithm based on the improved compensation of SVD for embedding the color image watermark into the color host image. Firstly, the watermark bit is embedded into 4 × 4 block by modifying the second row first column and the third row first column elements of U component after SVD. Then, the embedded block is compensated by the improved optimization operation for obtaining higher PSNR and larger threshold T. The embedded watermark is extracted from various attacked images by using the relation between the modified elements of U component without resorting to the original data. Moreover, the proposed algorithm overcomes the problem of false positive detection. The experimental results show that the proposed algorithm not only guarantees the invisibility and robustness of the watermark, but also has better performance than other methods mentioned in this paper.     

卧式镗床控制系统设计

目前我国国内的机床大约有90％多还处于老式的继电器控制下.由于继电器控制的机床有耗材、耗能、故障率高的缺陷,从而浪费了很多的人力、物力和财力.如果说把这些机床全部都更新换代,那样会需要很大一笔资金,就目前情况来说是不现实的,所以就有人开始尝试从控制部分的改造方面来下手,将它们的性能提升一个档次,更可以解决它的一些弊端,基于以上情况,作者选择了用PLC来完成卧式镗床的电气控制部分这个题目.经过设计并作了实物的演示,结果证明了设计的成功.     

Development of a Moodle course for schoolchildren’s table tennis learning based on Competence Motivation Theory: Its effectiveness in comparison to traditional training method

Based on Competence Motivation Theory (CMT), a Moodle course for schoolchildren’s table tennis learning was developed (The URL is http://www.bssepp.com, and this course allows guest access). The effects of the course on students’ knowledge, perceived competence and interest were evaluated through quantitative methods. The sample of the study consisted of 32 primary school students, who were randomly assigned to two groups, one of which used the Moodle course (Group M, N = 16) and the other one (Group C, N = 16) didn’t, and the intervention lasted 6 weeks. The result showed that (1) students made significant learning gains and demonstrated statistically significant higher perceived competence by participating in the Moodle course, (2) there was no statistically significant mean difference in table tennis interest between the two intervention groups. These positive effects on knowledge and perceived competence suggest that Moodle can be used as a tool to supplement traditional motor learning.     

多姿态人耳识别的局部线性嵌入及其改进算法

为了提高多姿态人耳识别的准确性,提出了一种改进局部线性嵌入算法的多姿态人耳识别方法。通过曲波变换提取人耳特征,采用改进局部线性嵌入算法对特征进行降维,选择最有利于人耳识别的特征向量;采用RBF神经网络建立人耳分类器实现人耳识别,并采用USTB人耳图像库进行仿真实验。相对于其他方法,该方法获得了更高的人耳识别率,从而验证了算法的有效性。     

石化工业强国战略研究

通过研究我国石化工业发展现状、面临的挑战与机遇,以及世界石化工业发展现状与趋势,建立了石化工业强国指标体系,分析出我国与世界石化强国存在的差距与问题。在此基础上,提出了我国成为石化强国的发展战略、战略目标、重点任务、发展路线图和保障措施与建议。     

依靠技术创新实现我国乙烯工业的有效发展

阐述了世界乙烯工业的发展趋势,论述了我国乙烯工业的发展现状及需求情况,提出了依靠技术创新实现我国乙烯工业有效发展的途径.     

低温水解制备不同晶型的纳米TiO_2

以四氯化钛为原料,通过低温水解法制备出不同物相的纳米TiO_2.研究了不同钛离子浓度、乙醇用量、反应温度和反应时间对纳米TiO_2晶相的影响,利用X射线衍射和拉曼光谱对所得样品进行表征.结果表明,水解过程中钛离子浓度的变化直接影响到产物晶型的改变,在钛离子浓度较高时,乙醇的存在对亚稳相纳米TiO_2的形成具有促进作用.