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。     

Effect of 3-Aminopropyltriethoxysilane on polycarbonate based waterborne polyurethane transparent coatings

A series of waterborne polyurethane (WPU) dispersions modified with different contents of 3-aminopropyltriethoxysilane (APTES) were synthesized based on poly(1,6-hexyl 1,2-ethylcarbonate) diol (PHEC) and isophorone diisocyanate (IPDI), and the films were obtained by casting the dispersions on Teflon molds. Effects of APTES content on the particle size and viscosity of the dispersions were studied. The structure and properties of the resulting films were investigated by Fourier transform infrared spectroscopy, wide angle X-ray diffraction measurement, dynamic mechanical analysis, thermogravimetric analysis and mechanical testing. The experimental results showed that the incorporation of APTES played an important role in the enhancement of the water and toluene resistance and mechanical properties of the SPU films. Young's moduli and ultimate tensile strengths were improved from 8.0 to 451 MPa and 6.5–19 MPa respectively as the APTES content increased from 1 wt.% to 20 wt.%. The ability of scratch resistance was enhanced, when the content of APTES increased to 20 wt.%, the 3H pencil could not mar the surface. Moreover, the transmittance spectra indicated that the coatings showed high transparence.     

R6401裂解汽油加氢二段反应器损伤和裂纹分析

对某厂３０万吨／年乙烯装置裂解汽油二段反应器锻焊接管（Ａ１８２－Ｆ３２１）与筒体相连角焊缝区裂纹的探伤、检验和分析得出,上述裂纹或位于角焊缝筒体侧熔合区（９例接管）,或位于角焊缝金属中（４例接管）,两种类型裂纹分别由角焊缝筒体侧熔合区焊缝一侧形成较宽的马氏体带和增碳带引起的脆化（５００ＨＶ）及角焊缝金属中含量较高的δ铁素体转变成σ相引起的危化（ＡＫ为６￣２４Ｊ）所诱发。不适当的焊接材料和焊接工艺是     

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.     

有限总体的广义压缩型预测

利用线性模糊的广义压缩最小二乘估计，提出了有限总体的广义压缩型预测。它是一个很大的预测类，包含了许多有偏预测，并且在预测均方误差意义下，得到了在参数的某个空间上，广义压缩型预测优于最佳线性无偏预测的充要条件。     

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.     

土木工程深基坑施工中风险控制的动态管理

土木工程深基坑施工全过程都存在风险,尤其是在城市闹市中心或周边环境复杂条件下,因此,实施动态管理,如清理地下障碍物、控制设计变更、强化数据管理、把握作业节奏、管理好材料质量,更换不合格的分包队伍,积极应对特殊气象条件对基坑的影响,才有可能实现对基坑风险的有效控制：     

加快结构调整合理利用资源实现我国石化工业的可持续发展

深入分析了我国石化工业的现状以及未来20年所面临的机遇与挑战,提出了增强我国石化工业国际竞争力和实现可持续发展的战略措施。