基于AT89C51系列单片机的倒计时器制作研究

倒计时器应用十分广泛,在制作倒计时器时多采用纯数字电路和模拟电路,电路复杂功能单一。如今微控技术应用十分广泛,采用单片机控制器制作倒计时器电路十分简单,功能齐全并且可以扩展其他功能。气短数码显示电路采用直接与单片机接口连接方式更加节省电路。成本低、功能灵活、使用方便等优势,更加巩固了单片机技术在电子产品制作中的不可替代的作用。     

CAI课件的多种人机界面模式

基于CAI课件人机界面的研究现状,探讨了利用超文本技术和人工智能技术设计生动、有趣、友好的CAI课件界面的方法。     

Unix下PROC开发ORACLE库的接口方法

利用数据库嵌入SQL访问的理论,研究了使用Pro C/C++在UNIX环境下开发ORACLE数据库接口程序的过程,得到了利用PROC集开发ORACLE接口程序的方法。并用一个实际例子说明如何具体开发ORA CLE数据库接口程序。     

基于无线网络的计算机接口实验平台设计

计算机专业的学生在进行计算机接口实验时,需要选择一个合适的实验平台,而无线网络作为一种新型的通讯方式,得到愈来愈多的应用。在计算机接口实验中,应用无线网络技术,使得接口实验平台的应用更加广泛。     

图书情报业务与信息市场

发展信息服务，走向信息市场，是当前图书情报事业发展的主要任务，通过加强信息宣传，扩大影响力，加速献信息资源和新技术转化，开展参考咨询和形式多样的信息服务，来推动图书情报业的繁荣发展。     

物理光学实验仿真平台的开发

为了提高学习者的学习兴趣和积极性,打破传统物理光学实验受时间和场地的限制,利用Matlab图形用户界面的设计与开发功能,制作了简洁美观、可拓展性强的物理光学实验仿真平台,实现了对多个经典光学实验的计算机仿真,包括光学拍、球面波干涉、杨氏干涉、等倾干涉、等厚干涉、夫琅和费衍射、菲涅耳衍射、光栅衍射、空间滤波、光的偏振和全息照相等.实验结果表明,该平台具有实验参数可灵活设置和良好的人机交换功能,并且通过mcc编译可以脱离Matlab环境使用.     

Numerical Analysis of the Stability of Embankment Slope Reinforced with Piles

The effects of stabilizing piles on the stability of an embankment slope are analyzed by numerical simulation. The shear strength reduction method is used for the analysis, and the soil - pile interaction is simulated with zero-thickness elasto-plastic interface elements. Effects of pile spacing and pile position on the safety factor of slope and the behavior of piles under these conditions are given. The numerical analysis indicates that the positions of the pile have significant influence on the stability of the slope, and the pile needs to be installed in the middle of the slope for maximum safety factors. In the end, the soil arching effect closely associated with the space between stabilizing piles is analyzed. The results are helpful for design and construction of stabilizing piles.     

论短信文学的文体特征及意义

短信文学以一种不同于传统文学的全新姿态出现在人们的面前。在文体学、语言学、传播学、文化学、社会学等多方面都有丰富的意义。     

一种三维数值方法及其应用分析

为了提高包含有交界面的三维复杂流动问题的求解精度，将二维坐标系中的Youngs算法公式推广到三维坐标系应用，根据流体体积分数的定义，在二维直角坐标系Youngs算法的基础上，把介质分界面近似为平面，通过引入修正系数，实现了Youngs算法在三维坐标系中的应用，给出计算方法，并编写程序进行算例验证，数值模拟了具有复杂边界的空中爆炸形成冲击波的形成和传播过程，通过数值试验，证明了Youngs算法在三维坐标系中成功的应用．     

Does STES‐Oriented Science Education Promote 10th‐Grade Students’ Decision‐Making Capability?

Today’s society is continuously coping with sustainability‐related complex issues in the Science‐Technology‐Environment‐Society (STES) interfaces. In those contexts, the need and relevance of the development of students’ higher‐order cognitive skills (HOCS) such as question‐asking, critical‐thinking, problem‐solving and decision‐making capabilities within science teaching have been argued by several science educators for decades. Three main objectives guided this study: (1) to establish “base lines” for HOCS capabilities of 10th grade students (n = 264) in the Israeli educational system; (2) to delineate within this population, two different groups with respect to their decision‐making capability, science‐oriented (n = 142) and non‐science (n = 122) students, Groups A and B, respectively; and (3) to assess the pre‐post development/change of students’ decision‐making capabilities via STES‐oriented HOCS‐promoting curricular modules entitled Science, Technology and Environment in Modern Society (STEMS). A specially developed and validated decision‐making questionnaire was used for obtaining a research‐based response to the guiding research questions. Our findings suggest that a long‐term persistent application of purposed decision‐making, promoting teaching strategies, is needed in order to succeed in affecting, positively, high‐school students’ decision‐making ability. The need for science teachers’ involvement in the development of their students’ HOCS capabilities is thus apparent.