约束条件下的广义最小二乘估计

本文仿造约束最小二乘估计和广义最小二乘估计的推导方法．给出约束条件下的广义最小二乘估计。     

Excel在酸雨统计分析中的应用

将microsoft公司office系列软件Excel强大的计算、公式编辑、数据统计和绘图功能,应用在酸雨统计分析中,通过计算机自动运算和图表处理,方法简捷、快速、高效,便于从数据中分析出所需要的信息。     

闻一多留美提前归国原因探析

留美诗人闻一多在未取得学位的情况下提前归国,学界对此一直倾向于用爱国主义情感的驱动来加以阐释。本文更侧重诗人的个人世界,从他对文学的执着、对文化冲突的不适以及情感归依三方面入手,探析其归国的内在动因。     

一类非线性时滞系统的自适应动态面控制

针对一类严格反馈非线性时滞系统,提出了一种自适应神经网络动态面控制方案。通过引入一阶滤波器,避免了传统反演设计中的＂计算膨胀＂问题。通过构造恰当的Lyapunov-Krasovskii函数,对未知时滞项进行了补偿。此外,基于Lyapunov稳定性理论,证明了闭环系统所有信号半全局一致最终有界。最后,仿真实例表明了所提控制方案的有效性。     

王棻诗中的近代意识

传统读经讲经的王棻,生活在近世中西两种社会和两种文化激烈碰撞之际,其诗作中流露出＂西学东渐＂这一时代特色原本自然,量虽不大,却是一种进步。     

鱼腥草水培营养液的筛选

采用水培方式研究了6种常用营养液配方对鱼腥草生长和品质的影响,探讨了鱼腥草水培适宜的营养液配方。结果表明,6种营养液配方对水培鱼腥草生长无显著影响,但对其可溶性糖含量和叶绿素含量有显著影响。水培鱼腥草可溶性糖含量以霍格兰配方最高,较对照增加179．26％;叶绿素含量以霍格兰配方最高,较对照增加56．15％。鱼腥草水培营养液配方以霍格兰配方较为适宜。     

经济可持续增长的路径选择——以制度创新为视角

可持续增长是在为避免世界经济二次探底,确保经济的持续复苏的背景下提出来的。中国也面临着可持续增长的问题,其中制度创新可以继续作为经济可持续增长的助推器,因为中国在改革开放后的两次大规模制度创新都极大的推动了经济增长。当前制度创新的途径可以从公平竞争制度创新完全释放非公有制经济的活力、城镇化制度创新促进国内市场延伸、社会保障制度创新拉动消费以促进经济可持续增长等方面展开。     

河南省永夏煤田煤及天然焦资源的综合研究

天然焦作为一种新的绿色替代能源日益受到重视.探讨了永夏煤田的成矿地质特征,岩浆侵入对煤层的影响,煤和天然焦的物理化学特征.结果表明,用煤田地质和物探、钻探综合方法能够准确、快速的划分煤和天然焦.对于准确、快速计算煤和天然焦的地质储量、节约工程经费、节约工期、进一步详细勘探、井田设计等都具有一定的现实意义.     

Enhancement of Anatomical Education Using Augmented Reality: An Empirical Study of Body Painting

Students in undergraduate premedical anatomy courses may experience suboptimal and superficial learning experiences due to large class sizes, passive lecture styles, and difficult-to-master concepts. This study introduces an innovative, hands-on activity for human musculoskeletal system education with the aim of improving students’ level of engagement and knowledge retention. In this study, a collaborative learning intervention using the REFLECT (augmented reality for learning clinical anatomy) system is presented. The system uses the augmented reality magic mirror paradigm to superimpose anatomical visualizations over the user’s body in a large display, creating the impression that she sees the relevant anatomic illustrations inside her own body. The efficacy of this proposed system was evaluated in a large-scale controlled study, using a team-based muscle painting activity among undergraduate premedical students (n = 288) at the Johns Hopkins University. The baseline knowledge and post-intervention knowledge of the students were measured before and after the painting activity according to their assigned groups in the study. The results from knowledge tests and additional collected data demonstrate that the proposed interactive system enhanced learning of the musculoskeletal system with improved knowledge retention (F_(10,133) = 3.14, P < 0.001), increased time on task (F_(1,275) = 5.70, P < 0.01), and a high level of engagement (F_(9,273) = 8.28, P < 0.0001). The proposed REFLECT system will be of benefit as a complementary anatomy learning tool for students.