新型半导体光催化剂-Cu_2O制备和性能研究

半导体光催化氧化技术由于具有价廉、环境友好等优点,被认为在有机污水处理领域具有很好的应用前景。近十年来,P型半导体氧化亚铜以其无毒、价廉、太阳光响应及性能稳定等优点成为一种备受关注的新型光催化材料。本文综述了目前湿法制备氧化亚铜方法以及改性技术,同时介绍了氧化亚铜在光催化氧化处理水中有机污染物和分解水制备氢气两方面的应用研究现状,并对氧化亚铜今后的研究方向提出几点建议。     

凯文·哈特诗歌语言中的解构主义

解构是读和写的双重活动,从多角度入手,引出文本中意义的冲突力量,从而展现文本表面上的统一和谐与实际上的不统一不和谐,揭示其内部的矛盾。一个文本可以被解读为具有跟它表面意义相去甚远的意义。本文试图通过诗人凯文.哈特的作品来阐述诗歌自身的解构:尽管我们不停地追寻着意义变化的踪迹,但最终还是永远也找不到意义的归宿,意义没有终极。     

Improved stabilization criteria for fuzzy systems under variable sampling

This paper investigates the problem of stabilization for fuzzy sampled-data systems with variable sampling. A novel Lyapunov–Krasovskii functional (LKF) is introduced to the fuzzy systems. The benefit of the new approach is that the LKF develops more information about actual sampling pattern of the fuzzy sampled-data systems. In addition, some symmetric matrices involved in the LKF are not required to be positive definite. Based on a recently introduced Wirtinger-based integral inequality that has been shown to be less conservative than Jensen’s inequality, much less conservative stabilization conditions are obtained. Then, the corresponding sampled-data controller can be synthesized by solving a set of linear matrix inequalities (LMIs). Finally, an illustrative example is given to show the feasibility and effectiveness of the proposed method.     

确定电子资源评价指标模糊权重的可行方法

本文应用模糊理论中的模糊关系和模糊转换法来处理专家群体对电子资源评价指标重要性的问卷调查和数据分析。以基于重心的解模糊化方法确定模糊权重值,充分利用专家所给出的评判信息,将提高最终评测结果的可信度。     

计算机专业硬件教学现状分析与对策

针对目前计算机专业教学中“重软轻硬”的现象,分析了目前计算机专业硬件教学的现状,并提出了解决的策略。     

论《左传》委婉语的构成方式

《左传》中保留着极为丰富的委婉语,这些委婉语的大量使用反映出春秋时期的修辞艺术已达到较高水平。《左传》委婉语的构成方式有三种:一是替换语词,包括替换为表谦敬类语词以及替换为语义相关类语词;二是转化语句,包括转化为请求性、假设性以及询问性语句;三是赋诗引用,包括赋诗引诗以及引用熟语(谚语)。     

高中通用技术教学中如何激发学生的学习兴趣

高中通用技术课程是一门全新的课程,是对我国普通高中课程体系的完善,其集实践性、技术性、抽象性于一身。由于通用技术在高考中不占分值,学生学习兴趣不高,导致教学效率较低,学生无法灵活运用所学知识和技术的现象,不利于学生的全面发展。     

应用德尔菲法构建城市体育产业竞争力指标体系

本文通过构建城市体育产业竞争力评价指标体系,详细叙述了德尔菲法及其各指标的应用过程和方法。其中一级指标4个,二级指标26个,研究结果表明,德尔菲法适合于城市体育产业竞争力评价指标体系的构建,在德尔菲法的应用全过程中如何识别和检验专家所设计的指标体系一致性是工作中的难点。     

Keeping their attention: Classroom practices associated with behavioral engagement in first grade mathematics classes in China and the United States

This study investigated variation in students’ behavioral engagement across mathematics classes in China and the United States. Student behavioral engagement was examined along with two aspects of the classroom (group size and teacher instructions given about classroom behavior). Video observational data were collected and coded over 1051 time intervals in 35-minute mathematics sessions in Chinese classrooms (n = 8) and comparable American classrooms (n = 7). Latent growth analyses revealed that overall, behavioral engagement declined over time, although the drop-off was dramatically sharper in American classrooms relative to Chinese classrooms. In addition, larger group size and the timing of teacher instructions (given before versus after the behavior) were significantly associated with increased engagement. This study revealed compelling cultural differences as well as patterns in student and teacher behaviors associated with students engaging in on-task behaviors in the classroom. Implications for ways to promote effective classroom behavior are discussed.     

当前我国老年教育的问题与反思

本文拟对我国现代老年教育的主要问题进行分析,在坚持"以人为本"的老年教育核心理念下,提出解决建议。