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1.
现代许多工业中都需要对温度参数进行有效控制,以实现产品性能优化.通过编程,将温度控制与单片机的使用相结合,可以达到性能优化的目的.本文主要研究了利用单片机对炉温进行自动控制的设计方案.  相似文献   

2.
现代许多工业中都需要对温度参故进行有效控制,以实现产品性能优化。通过编程,将温度控制与单片机的使用相结合,可以达到性能优化的目的。本主要研究了利用单片机对炉温进行自动控制的设计方案。  相似文献   

3.
根据最小均方误差原理,对数字通信系统中获得码元同步的信号提出了一种码元判决算法,并对其进行了优化.此算法在信噪比很低的情况下,能很好地还原出原数字信号,具有高保真与强抗噪性能,且运算量小,易于高速单片机及DSP实现.以ATMEL公司AVR单片机ATMEGA16L芯片为例,给出了优化前后的算法运行时间.  相似文献   

4.
目前单片机课程实践教学主要以课内实验的方式进行,实践教学体系不完善,同时也缺乏对实践教学进行考核与评价等环节。针对此种情况,笔者认为应该对单片机课程实践教学进行改革:应构建单片机课程实践教学体系,优化单片机课程实践教学的方法和手段,调整单片机课程实践教学的内容,完善对单片机课程实践教学进行考核与评价的体系。  相似文献   

5.
文章首先介绍了单片机技术的发展,单片机课程的历史沿革,从中可以看出传统的单片机教学遇到了极大的挑战,已经难以适应现代电子信息企业和学生的需求。针对此问题,对单片机课程进行了一系列的改革,包括实施理实一体化教学、项目式教学,同时对课程内容进行了优化。  相似文献   

6.
单片机在家用电器上应用越来越广泛,根据洗衣机系统性能自动化需求,分析性能指标,设计出基于单片机为内核的洗衣机控制系统总体架构,分别设计出控制系统的硬件电路部分和软件部分,利用keil uvision和Proteus进行电路仿真,其结果满足出洗衣机性能自动化需求,实现一款基于单片机的洗衣机控制系统的设计和功能验证,同时对其他单片机控制系统设计具有借鉴作用。  相似文献   

7.
本文基于单片机,对其控制下的红外线自动门控制系统设计进行了研究。通过分析红外自动门控制系统的MC68HCIIK4的单片机,并且对于控制系统的外围电路重新进行设计,从而对于单片机MC68HCIIK4的片内资源进行有效规划和利用,最大程度降低系统的复杂程度,从而大幅提高系统安全性能和稳定性能。并且当我们在对于红外线自动门的控制系统设计环节中,使用双元件型的热释电红外传感器,控制自动门开关。  相似文献   

8.
锁存器利用其典型的三态特性,应用于诸多电子控制领域.据此,本文以单片机为核心控制器件,对锁存器在单片机系统组成中的分时复用功能及单片机控制应用中I/O口的扩展与优化,进行了分析研究.结果表明:合理使用锁存器在传输数据信息时呈现的一致性、暂存性、高阻性的逻辑特性,可以更有效优化控制领域中的电子设计,简化硬件电路结构.  相似文献   

9.
锁存器利用其典型的三态特性,应用于诸多电子控制领域.据此,本文以单片机为核心控制器件,对锁存器在单片机系统组成中的分时复用功能及单片机控制应用中I/O口的扩展与优化,进行了分析研究.结果表明:合理使用锁存器在传输数据信息时呈现的一致性、暂存性、高阻性的逻辑特性,可以更有效优化控制领域中的电子设计,简化硬件电路结构.  相似文献   

10.
单片机课程教学改革研究与实践   总被引:2,自引:0,他引:2  
本文针对我国高校单片机教学的现状,从调整培养目标,优化教学内容,加强师资队伍建设,改革教学方式和方法等方面对单片机教学的改革进行了系统的研究与实践.通过实践教学效果表明,这些方法是行之有效的.  相似文献   

11.
利用TEC(电热制冷器),在CO3激光器1060nm波长的温度控制电路中,提高控制精度、降低功耗、增加功率,提高集成度,设计波长的热电温度控制原理及理论分析。  相似文献   

12.
Refutation text is potentially more effective than standard text for conceptual change. Learning from text and graphic is also potentially superior to learning from text alone. In two studies, we investigated the effectiveness of both a refutation text and a refutation graphic for promoting high school students’ conceptual change learning about season change, as well as their metacognitive awareness of conceptual conflict and knowledge revision. In both studies, participants were randomly assigned to one of four conditions: (1) standard text with standard graphic, (2) standard text with refutation graphic, (3) refutation text with standard graphic, or (4) refutation text with refutation graphic. Both studies had a pretest, immediate post-test, and delayed post-test design and involved students with an initial common misconception about the causes of season change. In Study 2, explicit relevance instructions to observe the important illustration were given to the participants. In both studies, refutation text with refutation graphic was not more beneficial than other instructional materials, either at immediate or delayed post-test. In Study 1, more stable conceptual change learning emerged in readers of the refutation text with standard graphic compared to readers in the control condition. In Study 2, readers of the standard text with refutation graphic performed as well as readers of the refutation text with standard graphic. In addition, more readers of the refutation text with either graphic showed metacognitive awareness of their knowledge change compared to readers in the control condition. Educational implications underline the importance of relevance instructions for guiding readers toward the graphic and of the design of text-graphic pairing to sustain knowledge revision.  相似文献   

13.
In the process of designing teaching materials for learning problem solving in technology education, domain-specific design specifications are considered important elements to raise learning outcomes with these materials. Two domain-specific design specifications were drawn up using a four-step procedure and were applied to improve existing teaching-learning packages. The study focused on a construction problem (open-ended) and an explanation problem (constrained). Construction material (fischertechnik) was used to solve the problems. In two experiments, these newly designed teaching materials were compared with the existing teaching materials. In all, 600 pupils participated in these experiments. In the experiment with the construction problem, no learning gains were made at all: the small gain in quality of the product made by the pupils cost too much time. In the experiment with the explanation problem, the quality of the pupils' product was significantly better in less time. It is argued that strongly structured teaching materials for constrained problems are more suitable for learners with little experience with construction material.  相似文献   

14.
谢欣晨 《英语沙龙》2014,(11):63-63
残酷世界: 你好?很冒昧地给你写这封信,希望你不要介意。 纵观我22年的人生,你虽残酷,但对我也算仁慈,因而,我由衷地想对你说一声——谢谢!  相似文献   

15.
罪疑唯轻原则又称疑利被告原则或存疑有利于被告原则,是指在犯罪事实的存在与否在证据上存在合理怀疑的时候,应当作出有利于被告的推定。罪疑唯轻原则在刑事司法中具有极为重要的意义,因为它几乎适用于所有事实存’疑的刑事案件的处理,而事实存疑正是司法实务中经常遇见的情形。因此,有必要对罪疑唯轻原则存在定位进行梳理,并对其适用范围进行界定。  相似文献   

16.
明末清初,昆曲从苏州传入扬州并落了户。康乾盛世时期,扬州的昆曲家班主人、艺人等与外界交流频繁。近代扬州的昆曲以曲社为主要载体,在与各地绵延不绝的交流中继续发展。可以说,昆曲在扬州的发展始终伴随着交流,其在扬州的发展史是中国戏剧史上不可或缺的重要一页。  相似文献   

17.
老子之所以揭橥“上善若水”,是因为水能够滋润万物;水顺应自然而不争;水性柔弱,不择地而流,常常停留在卑下的地方,与物无争……,因此,圣人应师法水德,“居善地,心善渊,与善仁,言善信,政善治,事善能,动善时”,以成就上德者之人格。  相似文献   

18.
在东西方的教育发展史上,教育的属性一直随着社会政治经济生活的变化而变化。在西方,随着经济生活中自由主义、凯恩斯主义和新自由主义的变迁,教育表现出"私益性"、"公益性"与"准公益性"的变化。在中国,建国以后,随着计划经济体制、商品经济体制和市场经济体制的变化,教育的属性也不断地从"公益性"向"准公益性"方向变化。在我国的社会转型期,要促进教育的发展,必须协调好国家、市场和教育三者的关系,建构为教育服务的宪制政府、服务政府、有限政府,培育为教育服务的有序市场,促使教育成为"第三部门"。  相似文献   

19.
明清文人的疏离心态及其意象载体   总被引:1,自引:0,他引:1  
明清时期一些文人热衷于写“落花”组诗,反映出一股“疏离”心理潜流在滋长。明代唐寅等人吟咏落花,以散漫自纵的生活态度疏离士大夫主群体;明清易代之际的遗民诗人吟咏落花,以飘零自守的精神气节疏离当朝统治者;清中叶袁枚吟咏落花,以洒脱自适的生活观念疏离主流价值取向;晚清龚自珍吟咏落花,以激愤和前瞻的姿态疏离主流社会。从这种疏离主流的心态可以感受到明清知识分子对精神自由的渴求,以及对传统文化精华的解悟。  相似文献   

20.
In many geometrical problems, students can feel that the universalityof a conjectured attribute of a figure is validated by their action in adynamic geometry environment. In contrast, students generally do not feelthat deductive explanations strengthen their conviction that a geometricalfigure has a given attribute. In order to cope with students' convictionbased on empirical experience only and to create a need for deductiveexplanations, we developed a collection of innovative activities intended tocause surprise and uncertainty. In this paper we describe two activities, thatled students to contradictions between conjectures and findings. We analyzethe conjectures, working methods, and explanations given by the studentswhen faced with the contradictions that arose.This revised version was published online in September 2005 with corrections to the Cover Date.  相似文献   

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