Screening of plane S waves by an array of rigid piles in poroelastic soil   总被引：2，自引：0，他引：2  

Yuan-qiang Cai  Guang-ya Ding  Chang-jie Xu 《浙江大学学报(A卷英文版)》2008,9(5):589-599

An array of rigid piles used as a screening barrier for plane shear （S） waves is investigated in a homogeneous unbounded space. The dynamic poroelastic theory of Biot is employed, under the assumption of an incompressible solid grain. Using Fourier-Bessel series, the problem of multiple scattering is solved by imposing continuity conditions and equilibrium conditions at the soil-pile interfaces with the translational addition theorem. A parametric analysis is conducted to investigate the influence of the permeability of poroelastic soil, separation between piles, number of piles and frequency of incident waves on screening effectiveness of the barrier, and the results are compared with those in an elastic soil medium. Computed results show that the intrinsic permeability of the soil medium displays an apparent effect on the screening of plane S waves.  相似文献   

A metasynthesis of the complementarity of culturally responsive and inquiry‐based science education in K‐12 settings: Implications for advancing equitable science teaching and learning          下载免费PDF全文

Julie C. Brown 《科学教学研究杂志》2017,54(9):1143-1173

Employing metasynthesis as a method, this study examined 52 empirical articles on culturally relevant and responsive science education in K‐12 settings to determine the nature and scope of complementarity between culturally responsive and inquiry‐based science practices (i.e., science and engineering practices identified in the National Research Council's Framework for K‐12 Science Education). The findings from this study indicate several areas of complementarity. Most often, the inquiry‐based practices Obtaining, Evaluating, and Communicating Information, Constructing Explanations and Designing Solutions, and Developing and Using Models were used to advance culturally responsive instruction and assessment. The use and development of models, in particular, allowed students to explore scientific concepts through families’ funds of knowledge and explain content from Western science and Indigenous Knowledge perspectives. Moreover, students frequently Analyzed and Interpreted Data when interrogating science content in sociopolitical consciousness‐raising experiences, such as identifying pollution and asthma incidences in an urban area according to neighborhood location. Specific inquiry‐based practices were underutilized when advancing culturally responsive science instruction, though. For example, Using Mathematics and Computational Thinking and Engaging in Argument from Evidence were infrequently encountered. However, culturally responsive engineering‐related practices were most often connected with these, and thus, represent potential areas for future complementarity, particularly as the United States embraces the Next Generation Science Standards. In considering innovative directions for advancing equitable science education, several possibilities are discussed in light of the findings of this study.© 2017 Wiley Periodicals, Inc. J Res Sci Teach 54:1143–1173, 2017  相似文献   

从文化视野看孙中山三民主义     

史艺军  宋晓敏 《辽宁师范大学学报(社会科学版)》2005,28(3):121-124

孙中山是中国早期先进知识分子对中西化认识的集大成，他在西方明和中国旧明相撞击的过程中全面阐发了三民主义的化宗旨，把西方先进化和中国传统优秀化相结合，并部分借鉴了近代马克思主义学说。他的化探索对于我们建设当代中国特色社会主义化是一种有益的启示。  相似文献   

试论唐传奇的诗意结构与诗意美     

孙超  杨世明 《四川师范学院学报》2005,(3):22-26

唐传奇与唐诗，并称为“一代之奇”。它为何具有无穷的艺术魅力呢？本文试图通过“诗意结构”理论的提出和阐释来回答。唐传奇的诗意结构主要体现在其“幻设的诗性”、“存在的诗根”和“人性的诗魂”这三个意蕴层面上。三者和谐统一在作品中所产生的艺术效果——“诗意美”是唐传奇艺术魅力的核心。  相似文献   

高校学生评教中师生间认知性冲突的实证研究     

丁福兴 《河南职业技术师范学院学报(职业教育版)》2005,(5):9-12

本研究采用自编问卷对苏州科技学院的1 000名学生及400名教师进行了调查,以考察他们在学生评教诸多问题上的认知性差异与冲突.经过对两个样本在各个项目上的均值差异显著性检验,结果表明:师生之间存在着价值性与程序性两类认知性冲突,且在价值性认知冲突上表现出根本性的分歧,而在程序性认知冲突上表现出较高的相容性.  相似文献   

Windows显示过渡效果基本原理     

陈雄峰 《闽江学院学报》2003,24(2):39-42

本针对Windows显示区编程时只能控制矩形区域及Windows显示函数的特点，总结出利用缓冲区、区域几何划分、象素RGB值控制等方法实现显示区几种种区域单一效果、棋盘划分、几何形状的原理。  相似文献   

“这”、“那”类的隐性回指     

王道英  贺筠 《成都师专学报》2005,24(4):84-88

“这”、“那”指代词本身没有固定的含义，它们的意义随所指对象的变化而变化。“这”、“那”隐性回指最主要的特征在于指示代词的所指不是明显地出现，而是隐含（implicit）在语句的隐性所指对象中，是一种语义上的衔接。回指项替换先行项以后，意义也会随之改变，这给语言的理解造成一定的困难。本文通过对一百万字语言资料的考察，主要探讨“这”、“那”类包括型、联想型和总括型三类隐性回指的所指规律或倾向性规律。  相似文献   

深化对劳动价值论的认识   总被引：1，自引：0，他引：1  

娄先革 《焦作大学学报》2005,19(3):27-28

劳动价值论是马克思主义政治经济学的基石，没有劳动价值论，就没有马克思主义政治经济学。在科学技术获得重大发展的今天，劳动价值论也应随时代的发展而发展，我们也应根据现实的需要，深化对劳动价值论的认识。只有这样，才能体现马克思主义与时俱进的品质。  相似文献   

基于经验学习理论的我国开放大学先前学习认定实践的反思     

蒋广宇 《成人教育》2021,41(1):82-87

随着高等教育的普及和终身学习理念的传播,英美等国开始对学习者的先前学习成果进行评价并为其提供相对应的教育课程和学分,逐步形成了各自的先前学习认定模式。我国开放大学也已经开始在小范围内开展先前学习认定的实践探索,但由于缺乏理论指导,存在着诸多问题和困难,急需对已开展的先前学习认定的实践进行梳理和反思。基于“经验学习理论”对开放大学先前学习认定实践中的核心问题进行回应和反思,是解决实践中存在的困惑和问题,推动我国开放大学先前学习认定实践进一步开展的重要依据,也为我国构建学习型社会提供实践参考。  相似文献   

智能时代高校课程思政的设计理论与方法     

谢幼如  邱艺  黄瑜玲  章锐 《电化教育研究》2021,42(4):76-84

研究根据教育部有关文件精神,面向智能时代教育信息化发展方向,直击高校课程思政建设中存在的专业教育和思政教育“两张皮”问题,明晰课程思政建设的价值导向和功能作用;以课程与教学论为指导,强调“智能+”赋能思维方式转变,突出智能技术赋能教学创新,形成智能时代课程思政的设计理论;提出了确定课程思政目标、重构课程思政内容、选择课程在线平台、开发课程思政资源、建设课程思政基地、开展课程思政活动、实施课程思政评价的智能时代课程思政设计方法,以期为新时代我国高校全面推进课程思政建设、落实立德树人根本任务、构建“三全育人”大格局提供理论指导和实践借鉴。  相似文献