教学时序:学理澄清与实践超越——以"先教后学"与"先学后教"模式为例

"先教后学"与"先学后教"两种教学模式的纷争,本质上是教学时序的研究不足所导致的误解误用.教与学的先后次序应归属于教学时序,是指教学过程中教学各要素安排的先后顺序及其逻辑关系.实践超越策略在于辩证看待教学时序之于教学活动的客观影响与实践价值;树立良好的时序思维,统筹协调教与学的先后次序;依据教学活动的总体态势,强化教学时序的规划意识;增强教学时序调控能力,提升运用教学时序的灵活度以及综合考虑教学时间的其他构成要素,为教学时序的整体优化提供保障.     

冲突性新闻叙事时序性选择的心理效应分析

后现代叙事理论着重探究的是社会历史和意识形态等因素是如何影响叙事结构的,媒介产品作为一种叙事,其原则与技巧自然对社会现实产生作用力,尤其是冲突性新闻中,镜头选择和呈现的叙事策略产生了不同的受阅体验,长此而形成的某种刻板印象对社会秩序的良性循环构成了一种潜在的威胁。因此,本文重点分析冲突性新闻传播中镜头不同时序性呈现带来的不同收视体验及其所产生的深刻影响。     

压电超声马达

本文介绍几种典型的压电超声马达的结构和运行原理,并简要说明国内外研究的进展情况。     

Semi On-line Scheduling Problem for Maximizing the Minimum Machine Completion Time on m Identical Machines

In this paper, a semi on-line version on m identical machines M1 , M2, …, Mm ( m ≥ 3 ) was considered, where the processing time of the largest job is known in advance. Our goal is to maximize the minimum machine load, an NPLS algorithm was presented and its worst-case ratio was proved to be equal to m - 1 which is the best possible value. It is concluded that if the total processing time of jobs is also known to be greater than (2 m - 1 )Pmax where pmax is the largest job‘s processing time, then the worstcase ratio is 2 - 1/m.     

双积分A/D转换器工作原理的演示实验装置的设计

选用基本元件设计一种实验电路装置，通过各关键点时序波形观测，展示双积分式A／D转换器工作原理。     

Time Collocation Method for Structural Dynamic Problems

In order to achieve highly accurate and efficient numerical calculations of structural dynamics, time collocation method is presented. For a given time interval, the numerical solution of the method is approximated by a polynomial. The polynomial coefficients are evaluated by solving alge-braic equation. Once the polynomial coefficients are evaluated, the numerical solutions at any time in the interval can be easily calculated. New formulae are derived for the polynomial coefficients, which are more practical and succinct than those previously given. Two structural dynamic equations are calculated by the proposed method. The numerical solutions are compared with the traditional fourth-order Runge-Kutta method. The results show that the method proposed is highly accurate and computationally efficient. In addition, an important advantage of the method is the simplicity in software programming.     

方正奥思多媒体创作工具的研究与应用

从多媒体课件制作入手，通过对方正奥思的深入研究和具体应用，详细阐述了利用方正奥思创作多媒体的特点及制作技巧，以促进广泛利用方正奥思多媒体创作工具．     

多状态控制信号发生电路

本文详细地介绍了利用译码器和计数器这两种不同的逻辑器件来产生多路顺序控制信号的原理电路及其工作过程；在本电路的设计过程中很好地体现了组合逻辑电路设计与时序逻辑电路设计二者之间的有机结合。     

学校教育类期刊发排文章的原则

学校教育类期刊面向教师或学生，刊物质量不仅关系到期刊社的生存与发展，而且与培养祖国建设者有着重大关系。教育类期刊办得好坏与发排文章关系密切。因此，发排文章应遵循实用性、时效性、时序性、均衡性、重点优先、对刊物发表意见的文稿优先的原则，同时，还要遵守国家期刊出版的有关规定。