共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
余斌 《湖州职业技术学院学报》2013,(1):85-87
太阳能热水器在实际生活中应用广泛,环保、安全且方便,采用STC12C5A32AD单片机为主控芯片设计了一个太阳能热水器控制系统,包括水位传感器、温度传感器、电磁阀、泵及电加热管驱动、按键、LCD12864显示、声光报警等硬件电路,并通过软件编程实现了太阳能热水器控制器的主要功能。该系统实现简单,使用方便,并充分利用了丰富的太阳能资源,可以大大节约煤、电等能源消耗。 相似文献
4.
5.
方小坤 《扬州职业大学学报》2014,18(3):45-47
本文提出以89C51F310为控制芯片,分别采用DS18B20为温度传感器,铜铆钉作为水位传感器,电阻丝作为加热器,电磁阀控制热水器自动上水,并且加入了数码管显示和定时功能模块.实现太阳能热水器的水温、水位显示、自动加热、自动上水以及报警等功能的智能温度控制系统,并具有良好的抗干扰性能、结构简单、可靠性高、成本低、功能易扩展等优点,在太阳能热水器领域中具有广阔的应用前景. 相似文献
6.
刘胜奇 《长江工程职业技术学院学报》2023,(4):26-28
太阳能热水器等家用设备供水控制需要使用水位控制器,但基于单片机或复杂计算机系统水位控制技术因为整体价格较高,在太阳能热水器等产品的应用上仍受到经济方面的限制。为此设计了一款基于逻辑电路CD4066的数字水位控制器,准确控制水箱水位,合理控制用水,达到节水目的。本装置利用水的电导性,连续全时段测量水位变化,把测量到的水位转换成相应的电信号,控制逻辑电路接收到该信号后,通过处理,实现水位显示、报警及自动控制等功能。与现有控制水位系统相比,本装置选用的芯片为常用芯片,系统造价低、控制效果好,有助于实现水资源的精细利用,具有广泛的应用场景。 相似文献
7.
背景技术:“太阳能热水器”一般安装在房屋顶部。由于它的户外热水箱与室内用水端之间存在着较长的管道距离。每次使用热水前,人们常常要把管道中的冷水排空。日久天长造成了大量的水资源浪费。基本思路:应用“伯努利方程”的原理,只靠自来水的水压,就能将“太阳能热水器”上下水管中存留的冷水返回利用。 相似文献
8.
9.
背景技术:“太阳能热水器”一般安装在房屋顶部。由于它的户外热水箱与室内用水端之间存在着较长的管道距离。每次使用热水前,人们常常要把管道中的冷水排空。日久天长造成了大量的水资源浪费。 相似文献
10.
11.
12.
13.
《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
14.
邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
15.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
16.
Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
17.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
18.
Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
19.
20.
RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献