初中化学预学单的设计与思考

本文从初中化学中基本概念和理论、元素化合物、化学计算和化学实验四个知识板块,分别讨论了预学单的设计.     

浅析“人肉搜索”的实质、利弊及引导策略

＂人肉搜索＂在当前已成为热门的社会话题,从一种单纯的网络文化现象逐渐到对现实社会生活产生越来越大的影响。鉴于人们对于＂人肉搜索＂的实质存在诸多误解,文章将对其相关的一些概念、内容进行厘定,分析此现象的利弊并提出可能的规范和引导措施。     

关于语言礼貌本体属性的思考

文章讨论了语用学研究范畴内礼貌的定义、本质、功能等内容,是语言礼貌现象研究中尚未完全明确的问题,旨在探索语言礼貌的本体属性,为建立全方位语言礼貌及语用原则理论奠定基础。     

Computed tomography using level set method and algebraic reconstruction technique

In this paper, a novel reconstruction technique based on level set method and algebraic reconstruction technique is proposed for multiphase flow computed tomography (CT) system. The curvature-driven noise reduction method is inserted into the conventional iteration procedure of algebraic reconstruction technique to improve the image quality and convergence speed with limited projection data. By evolving the image as a set of iso-intensity contours after each updation, the sufficient number of iterations for acceptable results is reduced by 80%-90%, while the image quality is enhanced obviously. Quantitative evaluation of image quality is given by using both relative image error and correlation coefficient. The resultant images can be utilized to detect flow regimes for monitoring industrial multiphase flow. Laboratory results demonstrate the feasibility of the proposed method. Phantoms of four typical flow regimes can be reconstructed from few-view projection data efficiently, and the corresponding image errors and correlation coefficients are acceptable for the cases tested in this paper.     

Resistance partial factor and reliability of cast ball-and-socket support joint

Considering the uncertainty of material performance, geometric characteristic and analysis method, the analysis of statistical parameters of the resistance of cast ball-and-socket support joints and the reliability analysis are carried out by JC method (improved first-order second-moment method) based on the relevant experimental data. Results show that the resistance partial factor of the joint increases with the increase of the reliability index. The resistance partial factors are suggested corresponding to the reliability index under different load combinations. Moreover, the suggested resistance partial factor is adopted in reliability design, and it is found that the reliability index of the joint is larger than the target reliability index. The optimal load combination is the one in which live load plays an important control role. Finally, based on the suggested resistance partial factors, the reliability analysis of cast ball-and-socket support joints of a project is conducted.     

Length-based vehicle classification in multi-lane traffic flow

For the realtime classification of moving vehicles in the multi-lane traffic video sequences, a length-based method is proposed. To extract the moving regions of interest, the difference image between the updated background and current frame is obtained by using background subtraction, and then an edge-based shadow removal algorithm is implemented. Moreover, a thresholding segmentation method for the region detection of moving vehicle based on location search is developed. At the estimation stage, a registration line is set up in the detection area, then the vehicle length is estimated with the horizontal projection technique as soon as the vehicle leaves the registration line. Lastly, the vehicle is classified according to its length and the classification threshold. The proposed method is different from traditional methods that require complex camera calibrations. It calculates the pixel-based vehicle length by using uncalibrated traffic video sequences at lower computational cost. Furthermore, only one registration line is set up, which has high flexibility. Experimental results of three traffic video sequences show that the classification accuracies for the large and small vehicles are 97.1% and 96.7% respectively, which demonstrates the effectiveness of the proposed method.     

信息技术与会展专业体验式教学

近年来,我国会展教育发展迅猛,会展教育已进入特色办学的差异化竞争阶段,培养多层次、多样化的应用型会展人才是会展教育发展的主流模式。在现阶段,基于信息技术的会展实验室是解决会展专业内涵建设的关键之一,同时也是体验式教学一个重要载体。此外,结合上海应用技术学院开发会展教学信息系统的经历总结了开发会展教学软件的经验。     

开展综合设计性实验 培养大学生创新能力

结合高等学校自身情况,从大学生进行设计性实验角度阐述如何培养新时代下大学生的创新能力,并通过探讨大学生自主设计性实验的开展,对大学实验教学提出一定建议。     

试析教育咨询委员会的性质、职能及运行

<国家中长期教育改革和发展纲要>中明确提出"成立教育咨询委员会,为教育改革和发展提供咨询论证,提高重大教育决策的科学性".教育咨询委员会性质、职能的定位会影响其运行的有效性.论文立足于已有的相关研究,从性质、职能和运行三个方面对教育咨询委员会进行剖析,以合理定义和构建教育咨询委员会,使其为科学化教育决策服务.     

Bilingualism Narrows Socioeconomic Disparities in Executive Functions and Self-Regulatory Behaviors During Early Childhood: Evidence From the Early Childhood Longitudinal Study

Socioeconomic status (SES) and bilingualism have been shown to influence executive functioning during early childhood. Less is known, however, about how the two factors interact within an individual. By analyzing a nationally representative sample of approximately 18,200 children who were tracked from ages 5 to 7 across four waves, both higher SES and bilingualism were found to account for greater performance on the inhibition and shifting aspects of executive functions (EF) and self-regulatory behaviors in classroom. However, only SES reliably predicted verbal working memory. Furthermore, bilingualism moderated the effects of SES by ameliorating the detrimental consequences of low-SES on EF and self-regulatory behaviors. These findings underscore bilingualism's power to enrich executive functioning and self-regulatory behaviors, especially among underprivileged children.