项目教学法在《可编程控制器技术》实训课程中的实践

文章讲述了项目教学法的概念,《可编程控制器技术》实训课程的特点以及实施项目教学的意义,并对课程进行教学案例设计。     

可编程控制器的维护及检修技术探讨

可编程控制器是专为在工业环境下应用设计的一种数字运算操作的电子系统,所以它的正常工作对于工业生产是十分重要的。通过可编程控制器故障实例分析了可编程控制器日常维护和检修的内容、方法、步骤和注意事项。     

基于FPGA的微波炉控制器的设计

基于FPGA的微波炉控制器以现场可编程门阵列FPGA为载体,使用硬件描述语言VHDL编程实现各底层模块的功能。顶层采用图形输入完成设计。主要阐述模块化设计的思想和状态的描述方法,以及它们在硬件描述语言中的应用,并给出了其在QuartusⅡ开发系统下的仿真结果。该微波炉控制器结构简单、功能灵活,并具有在线可重复编程的特点。     

PLC中不同编程方法在设计中的应用

针对十字路口的交通指挥系统,采用可编程控制器中的梯形图编程设计、SFC语句编程设计、仿STL指令编程设计等不同的设计方法来满足系统要求。几种不同的设计方法适用于不同的设计人员和硬件条件,编程人员可根据自己对可编程控制器的熟悉情况并结合现场控制要求选择不同的编程设计方法。     

可编程控制器控制交通信号的设计与实现

可编程程序逻辑控制器（PLC,Programmable Logic Controller）,乃是一种固态电子装置,主要利用输入/输出装置的回授信号及储存程序,控制机械或程序的操作。在自动化系统中,PLC因为具备价格便宜、系统稳定及环境适应性佳的特点,一直为自动化业界所采用。可编程程序逻辑控制器的设计与研发具有很高的实用价值。     

基于plc的校园音乐喷泉及水工系统的设计

根据大连大学校园地理特点,设计基于plc可编程控制器的音乐喷泉及人工循环河流系统。采用音频频率作为喷泉控制信号;利用可编程plc及变频技术实现了喷泉组样式及快慢的控制,此外从节能的角度系统中还设计了水利发电并网系统及污水再利用系统。     

基于CPLD的并网光伏发电控制器设计

运用可编程逻辑器件CPLD设计了一款并网光伏发电控制器。该控制器由CPLD开发平台、温度传感器、接口电路组成,充电采用PWM方式控制。该控制器具有自动运行、双向切换的功能,可杜绝孤岛效应,并可对蓄电池的充放电进行保护。     

用于电梯控制模型设计的可编程控制器的教与学

针对可编程控制器教学中存在的问题,提出一种以设计基于S7-300 PLC的电梯控制系统为任务的教学模式,以达到学生主动参与,较快掌握可编程控制器原理及应用方法之目的。     

PLC实训教学的新思路与实践

针对可编程控制器系统性和实践性的特点,我们提出了开展PLC实验的新方案,并加以实践。指导学生以PLC为核心,从控制系统的知识结构出发,设计交流调速系统。实践结果表明,学生经过训练,专业素质有了很大提高,达到了知识与能力的有机统一。     

电梯PLC控制系统的组态模拟设计

应用三菱FX0N可编程控制器编写的一个三层电梯的控制系统,利用MCGS组态软件制作人机对话界面,检验电梯PLC控制系统的运行情况。实践证明,PLC可编程控制器和MCGS组态软件结合有利于PLC控制系统的设计、检测,具有良好的应用价值。     

Left-behind children: teachers’ perceptions of family-school relations in rural China

Large-scale rural-urban migration in China has left rural schools with large proportions of left-behind children whose parents are away working in the city. This has a huge impact on family-school relations and poses a burden on teachers. This study draws on 42 interviews with teachers working in two rural schools. This article argues that teachers’ negative narratives about antagonistic family-school relations are driven by the gaps between their culturally embedded traditional models of family-school relations and the reality, with implications for the expanded role of schools and that of grandparents as caregivers. This article further discusses the implications of these findings for rural schools and draws heavily on Western models of family-school relations in a comparative perspective.     

略论高校文科成绩评定的公正性

本文研究高校文科成绩评定的公正性 ,分别从三个方面展开论述。一、公正的客观性和主观性。本部分主要解构了影响公正的客观性和主观性的因素。二、公正的绝对性和相对性。本部分将公正分为高级层面和初级层面 ,并探讨了公正率的量化方法。三、公正的主动性和被动性。本部分主要研究教师和教育管理部门在评分公正性方面的不同的支配作用     

不对称三相调压器

叙述不对称三相调压的原理和介绍不对称三相调压器电压的分析;给出了该调压器电压的计算公式.     

研究性学习的一个案例

本文是研究性学习的一个案例,在课堂教学中具有很强的操作性,目的在于用案例的形式来揭示研究性在课堂教学中的程序,供同行们参考,权作抛砖引玉。     

The Complexity of Disengagement with Education and Learning: A Case Study of Young Offenders in a Secure Custodial Setting in England

Abstract

This study explored the nature of disengagement in young people serving custodial sentences. This was in order to gain new theoretical insights into strategies for their reengagement with education. This is because 90% of young offenders who drop out of school prior to incarceration are reportedly disengaged (dropout being an indicator of disengagement). This paper reports on a qualitative ethnographic case study in one secure children’s home in England. Semi-structured interviews with 16 incarcerated young people were conducted from which five participated in in-depth case studies along with teachers and care staff. Data were collected as participants engaged with a learning opportunity over a period of time. Extending emerging theory of disengagement, findings showed that disengagement oscillated between both active and passive forms within the same individual and pointed to the need for a range of strategies needed for reengagement. This paper suggests that disengagement is complex where the physical and social context shapes how disengagement manifests. This has pedagogical implications for education in custodial settings and other at-risk children in alternative or mainstream education provision.     

How to ‘future-proof’ the use of space in universities by integrating new digital technologies

This paper examines how digital technologies shape the use of space in universities with a particular focus on the implications on organisational level. In order to maximise the potential of new technologies, I argue that universities will have to reconsider their use of space. This includes addressing the impact of new technologies on pedagogies, on facilities and on students. This paper discusses seven organisational consequences, with an aim to guide estate planning and strategic investment in campus buildings and facilities.     

神经可塑性理论与智力教育

本文介绍了Dennis提出的智力理论的一种新理论--神经可塑性理论,该理论认为智力的发展是随着大脑神经网络的可塑性的发展而发展的,同时此理论可以解释许多其它智力理论不能解释的智力现象.本文还讨论了神经可塑性理论对当前智力教育的一些启示.     

马克思股票市场价值理论探析

本文概述了马克思对股票市场价值的理论分析,并选择股票上市价格对该分析进行实证检验.检验结论是,股票上市价格与公司预期收益、预期收益可靠度和股票需求量呈显著正相关关系,与其供给量和市场利息率呈显著负相关关系,这一结论验证了马克思的理论分析.     

What's in Your Box? Promoting Self-Reflection and Analysis of External Influences on Gender Expression and Sexual Orientation Attitudes

This lesson plan is designed to stimulate awareness and reflection on personal attitudes toward gender expression and sexual orientation. Participants are guided to identify and analyze how external influences from various socialization agents shape gender and sexual orientation norms and, consequently, personal attitudes about gender expression and sexual orientation. This lesson introduces a box as a metaphor for a human being, with the intention of enlightening participants that humans are dynamic beings with unique characteristics that do not necessarily fit in neat boxes. This lesson plan describes how to achieve these goals in college classrooms and with other adult learners.