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1、the principle of simplified EIA of construction projects in the region. In terms of land, linked to the implementation of urban and rural construction land increase and decrease, replacement indicators for priority areas project. Charges, into the projects of water, electricity, administrative charg
2、es and preferential policies. In the area of taxation, and settled in areas of industry and its production company, within 5 years after the completion of fiscal incentives to enterprises. In terms of financing, integration of land, tax, financial and other resources, and construct Government credit
3、 + business credit credit system, establishment of marketization, commercialization and modernization of the investment and financing platform; effective Bank-enterprise docking, encourages private capital into the Park, to raise industry development fund. 5, optimize the environment and service ind
4、ustries. To create policy lowlands, Highlands, integrity of service land, development land as the goal, to optimize the area under development environment. All administrative law enforcement departments to appoint a full-time personnel stationed in areas dedicated to coordinating and solving problem
5、s associated with businesses in this sector. When there are substantial issues, sector leaders arranged to personally intervene, in-person, in-person push tangible area building a green light, easy line. To further reduce and standardize administrative examination and approval items, simplify examin
6、ation and approval links, improve efficiency; according to the .Since the educational practice of the mass line of the party, himself seriously in the education, practical control central eight rules and opposing the four winds and practicing three Suns, and check the spirit of Jiao Yulu, ideology,
7、solicit opinions based on outstanding problems checked swing, careful analysis and reflection. Will now check report is as follows: first, adherence to the partys political discipline, eight in the central provision, change the style of the basic situation of 1, in compliance with the partys politic
8、al disciplines. Conscientiously abide by the partys political discipline, abide by the Constitution and the rules and regulations of the party, in the political, ideological and maintain highly consistent with the CPC Central Committee on the action, there is no violation of the partys political dis
9、cipline problems. 2, in the implementation of the central authorities of the eight provisions. Improving research, improving research methods, but there are less grass-roots units, primary first-hand an inadequate grasp of the problem, which is to be strengthened in the future. Second, construction,
10、 strictly in accordance with the provisions to streamline and improve the quality of meetings of the Conference. Third, streamlining file briefs, culture involves all aspects of propaganda and ideology, sometimes due to the practical needs of invention notifications, this area needs further电子设计大赛总结报
11、告 学号：2 姓名：李永飞1. 摘要1.1目的 设计并制作一个家用电热水器控制系统，容量2升左右。水温可以在一定范围内设定，并保持设定的温度基本不变，同时具备水位检测控制功能。1.2方法 整个题目分温度测量与控制和液位检测两部分，温度测量和控制电热丝加热部分由单片机控制实现，液位检测部分由开关电路实现。1.3结果 开机后，当水位低于A点时，红色警示灯亮，水位上升至A点时，红色警示灯熄灭。当水位到达B点时，水泵会自动断开，停止加水。此时如果加水至C点，黄色警示灯亮。 单片机键盘输入温度为40，原水温由温度计检测为20度，且单片机显示也为20。在实验过程中，单片机输入温度后，电热丝开始加热，水温从
12、20可以连续上升至40停止，同时该系统可以实现动态温度变化不超过4，静态温度变化不超过1。1.4结论 系统可以实现题目的基本要求，实验过程中误差较小，并且外围电路比较简单，可以考虑用于实际。2.关键词STC89C54单片机 DS18b20 本系统采用STC89C54实现液位和温度控制，温度信号和液位信号由DS18b20和三极管开关电路提供，通过信号反馈来实现对水温和水位的控制，同时可以通过单片机设定温度值和显示实际温度，并且可以实现对水泵和电热丝的控制。2. 目录摘要-1关键词-1正文-1系统设计-1单元电路设计-2软件设计-4系统测试-11结论-11参考文献-11附录-114.正文4.1系统
13、设计 检测水位信号和产生警示作用由外围电路来实现，检测的水位信号传给单片机处理，单片机通过继电器控制水泵工作。温度检测由DS18b20芯片来实现，检测的温度信号传给单片机并显示出来，然后由单片机通过继电器控制电热丝的工作。（1）温度测量部分方案一采用热敏电阻，可实现40到90测量范围，但热敏电阻精度、重复性、可靠性较差。方案二采用18b20，它的测量温度范围为 -55+125，在-10+85范围内,精度为0.5，具有测温系统简单、测温精度高、连接方便、占用口线少等优点。（2）驱动控制部分方案一全部采用外部电路，通过电压、电流实现信号的检测和控制，但是电路比较复杂，容易受干扰，导致稳定性不好，误
14、差较大。方案二采用单片机程序控制，可以使外围电路简化，减少外部干扰，能够准确控制，且误差较少。4.2单元电路设计4.2.1输出为5V的直流稳压电源 整流电桥将正弦交流电转换成单向脉动的直流电，但还有很大的波纹，并联小的电容可以滤去频率较大的正弦波，并联大电容可以滤去频率较小的正弦波，从而使直流分量更加稳定，7805可以使电路输出保持5V电压。此电路在试验过程中给各级电路及水提供5V电压。4.2.2液位检测这部分主要用到三极管的开关作用，当三级管处于饱和区，开关处于闭合状态，当三极管处于截止区，开关处于断开状态。B和C采用的是NPN型三极管，在允许范围内，当基极电压处于高电位时，电路连通。A采用的是PNP型三极管，当基极电压
