实验室电表数据智能管理系统设计

为了有效智能地管理实验室,保护先进精密的仪器设备,设计了一套基于实验室电表数据的智能管理系统。本系统以STC12为核心的采集终端通过MODBUS-RTU通信协议从各个实验室电表中获取所需要的电力数据,再经由TCP/IP协议发送给远程服务器,服务器对数据进行处理并存入数据库中;系统根据各实验室的实际情况设计特定的处理机制,当数据出现异常时,服务器会向管理者的手机发送警告信息,同时管理者也可以通过手机主动获取实验室当前电力数据。经过实际测试,系统实现了实时监测实验室电表数据的功能,帮助实验室管理人员实时了解当前实验室设备使用情况,方便实验室的日常管理、监控和维护。     

水压锥阀阀芯表面微造型的润滑性能研究

以水压锥阀为研究对象,通过在阀芯表面加工规律分布的表面微造型以改善阀腔内的润滑性能。基于CFD方法建立仿真模型,研究表面微造型的形貌、几何尺寸以及分布密度对阀腔内润滑性能的影响,研究结果表明:加工有圆台形表面微造型的水压锥阀阀腔内润滑性能较好;当单元微造型面积占有率Sp选择在40%左右,高度比δ选择在1.2左右时,阀腔内润滑性能较好;表面微造型分布密度越大,阀腔内润滑性能越好。     

方便使用手机的音响控制装置

一、音响控制装置的优点在一定距离内,当人们用手机拨打或接听电话时,由于手机信号的辐射,与音响中扬声器的音量输出电路相连接的自动控制装置便开始工作,扬声器的音量自动减小到某一定值.当拨打或接听电话结束后,自动控制装置又自动将音量恢复到原来音量的大小.二、工作原理当人们用手机拨打或接听电话时,手机的辐射使感光盒内的感应器A发出强烈的闪光,光敏电阻的阻值降低(光敏电阻在无光照射时的阻值为∞,有光照射时阻值下降),从而接通电源给光电耦合器供电,使光电耦合器的3、4端导通.此时,电源既经光电耦合器通过3、4端给电容C充电,又给…     

消防栓与灭火器

消防栓和灭火器是消防员叔叔的好帮手,平时发生火灾时,他们并肩作战,情同手足,是一对铁杆好友。可是钉一天,一位消防员叔叔走到了消防栓面前,说：“消防栓真是我们的好帮手啊!     

基于单片机和手机WiFi的遥控电子时钟设计

将手机WiFi应用于电子时钟,对现有的电子时钟进行开发,实现手机WiFi遥控校时和计时的功能。采用DS1302作为时钟芯片,以单片机为控制核心,液晶显示器显示,通过处理器控制电子钟的时间,并进行调节。同时,为了防止系统工作时温度过高,采用DS18B20温度传感器实时监测系统工作时的温度,当温度超过设定的阈值时,报警模块自动报警。利用WiFi连接手机可对时钟上的时间进行调节,这使得时间调节更加快捷方便,从而更加满足使用者对时间精度的要求。     

最小系统数学模型的智能小车应用与实验

基于最小系统数学模型,实现了蓝牙遥控器界面在不同安卓手机中的智能小车控制,在重力感应遥控功能中,小车的稳定受遥控距离在空旷的空间中能达40m,超过40 m后传输稳定性变差。在通过手机重力感应遥控智能小车速度中,小车在手机倾斜角-20°~20°时,单片机输出的PWM占空比较低,导致不能驱动直流电动机的转动,小车静止不动。而当手机遥控器倾斜角绝对值大于20°时,小车受遥控器重力感应控制。小车车轮电动机速度与倾斜角的绝对值成正比关系,倾斜角越小,小车电动机速度值也越大。而当手机慢慢向前倾斜的同时也让手机向右端倾斜,此时小车向前的速度慢慢增大的同时,小车也有向右的速度,此时小车运动轨迹是一某点为圆心顺时针转圈,而APP端显示的速度值左边比右边大。经过测试达到了系统设计的要求。     

GPRS智能灌溉系统实验设计

针对本科自动控制实验教学需求,结合科研项目实践,根据现代无线智能灌溉系统需求,设计一种低功耗、高效的智能灌溉试验系统,实现智能控制实验教学.实验系统采用STM32芯片+(NRF24L01+PA+LAN)无线芯片组成的节点在多点采集数据,通过由低功耗STM32芯片、GPRS模块、低功耗NRF24L01 +PA+LAN无线芯片及嵌入式操作系统CoOS组成的主下位机来汇总各点采集数据和全局控制;设计高效、简洁的通信协议来组建无线通信网络,当远距离控制或不在监控室时,主下位机能向用户的手机发送报警信息或者呼叫用户以提示土壤旱情,而且可通过手机发短信查传感器的监测值以及控制电磁阀,当在灌溉区时,可以通过手机的蓝牙来实现对灌溉的精确控制.     

一种智能农业物联网系统的设计

开发了基于Android手机的智能农业物联网监测系统。首先,该系统从温度、湿度、光照强度、二氧化碳浓度4个方面进行数据分析,得到适宜农作物生长的数据。其次,该系统采用无线传感器网络技术,将物联网技术与农业信息的采集相结合,实现目标监测区域内影响农作物生长的环境参数的实时采集。最后,该系统通过App程序可以使管理者在手机上操作软件并实现远程操作。本系统为实现信息化的现代农业生产起到一定的指导作用。     

探究声音传播条件实验装置的创新设计

八年级物理真空罩实验较为抽象,现有的配套实验器材存在不足.文中利用磁悬浮技术将声源悬浮在真空罩内,避免实验时声音从底座传出对实验造成影响;用手机APP控制声源发出单一频率的声音,并用声波传感器改装的相对声音强度传感器实时监测声音的变化情况;用压强传感器改装的相对空气含量传感器实时显示罩内的相对空气含量值.     

解决农村家庭水箱使用存在的问题——初中物理综合实践活动案例

一、活动背景与目的 我们地处苏北农村乡镇地区,虽普遍饮用自来水,但供水时间短,主要是白天供水且用水高峰时水压不足,非用水高峰时,有时水压较高。笔者组织学生以小组为单位进行走访调查发现,80%以上农村乡镇家庭都使用不锈钢水箱贮水来弥补水压不足及停水后的用水问题。在使用水箱过程中,家庭水箱存在以下两方面的问题。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

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?     

只要努力,不要后悔

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.     

浅谈移民问题

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.     

Sister Carrie, an Adherent of Desires

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.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.