转矩提升问题

自控系统的设定信号可通过变频器灵活自如地指挥频率变化，控制工艺指标，如在烟草行业的糖料、香料工序，可由皮带称的流量信号来控制变频器频率，使泵的转速随流量信号自动变化，调节加料量，均匀地加入香精、糖料。也可利用生产线起停信号通过正、反端子控制变频器的起、停及正、反转，成为自动流水线的一部分。     

关于转矩提升问题

自控系统的设定信号可通过变频器灵活自如地指挥频率变化，控制工艺指标．如在烟草行业的糖料，香料工序．可由皮带称的流量信号来控制变频器频率．使泵的转速随流量信号自动变化．调节加料量，均匀地加入香精、糖料也可利用生产线起停信号通过正、反端子控制变频器的起、停及正、反转．成为自动流水线的一部分此外在流水生产线上．当前方设备有故障时后方设备应自动停机。变频器的紧急停止端可以实现这一功能。     

基于PLC的路灯智能节能控制系统设计

给出了一种有自动启停、智能调压控制、工作模式自动选择等功能的路灯节能控制系统的设计方法。采用该方法设计的智能路灯节能系统能有效节约能源,减少灯具损耗。     

基于市话网络的远程控制系统设计

利用单片机通过市话网络实现对远程无人值守设备的状态进行监视与控制,系统由铃流检测、摘挂机电路、DTMF接收器和信号音发生器等部分组成.系统采用600 Hz信号音作为设备状态提示与主叫命令解析应答.能够自动实现被叫方的接续功能,验证主叫密码、识别控制命令,回复主叫设备状态提示,根据主叫命令,控制设备启停,系统具有密码设置...     

软着陆闭管扩散炉几个关键控制单元的设计与应用

为了适应太阳能电池生产的新工艺需求,提出一种新型的软着陆闭管扩散炉系统,为扩散炉系统向智能型、精密型的方向发展进行有益的探索,并阐述了软着陆闭管扩散炉系统的结构组成和工艺原理以及技术指标,重点对扩散炉系统中送料装置软着陆单元、炉门自动封闭单元以及炉管压力平衡单元的电气控制部分进行了详细的分析,其中运用了上下位机与PLC结合的控制方式对送料装置软着陆、炉门自动封闭进行了设计,运用PID控制方式对炉膛内压力进行控制,使其达到平衡。     

自动浇水控制系统设计与试验

以STC89C52单片机为核心设计的设施园艺自动浇水控制系统,由检测、控制和显示三部分组成。将传感器检测到的温湿度、光照等数据与设定条件进行数据比较,根据比较结果控制水泵开启或关闭,直到参数达到正常标准,由LCD1602显示系统运行状态相关数据。系统有定时和自动两种工作模式,可通过程序设定自动浇水条件,也可通过按键设定浇水时间、次数和时长。系统在proteus软件下进行了仿真,后经实物试验,性能稳定,具有一定应用价值。     

基于AT89S52单片机的自动温控电风扇设计

利用单片机设计了电风扇的自动控制系统,分析了硬件电路与软件设计.利用单片机检测18B20采集的温度,根据温度高低,单片机的P2.7脚输出高电平或者低电平,来控制继电器线圈中能否有电流经过,根据继电器线圈通电时,常开触点闭合,设电流经过时,常开触点保持断开,从而实现自动控制电风扇的起停.该系统改变了传统的手动控制电风扇的起停,根据温度高低实现自动控制,方便于夏天人们晚上睡觉时使用.实践证明该系统可靠性高,工作稳定,成本低,实现了弱电控制强电,有较高的应用价值.     

微处理机控制立体声录放音系统的研制

本文介绍了利用TP-801单板机控制C101立体声盒式录音机机芯的实验系统。该系统除了能利用触模式按键实现录音机常规基本操作功能外,还可以实现手动编辑、自动选曲、定时开关机、全自动停等功能。各种工作状态均可用发光二极管指示。     

直拉法单晶制造中的直径检测技术

自动直径控制（ADC）是直拉法单晶制造中的重要环节，本文详细了直拉单晶的直径检测技术，分析其性能差异，对目前单晶炉设备的设计制造有参考作用。     

基于单片机的多功能供电控制系统

本系统多个测控单元通过串行通信接口与上位机相连，可巡检和控制十二路温度，控制八路电机定时开关，以及依据料位计开关状态按顺序控制十一路卸料输料，电机的起停，已经成功应用于电除尘低压供电控制系统中。     

Superoleophobic Surfaces with Controllable Oil Adhesion and Their Application in Oil Transportation

Controlling liquid adhesion is a fundamental issue in many applications for special wettable surfaces. Compared to superhydrophobic surfaces of different water adhesion, superoleophobic surfaces of controllable oil adhesion are much more practical, as it leads to non‐wetting for both water and oil. However, previously the investigation for oil adhesion ability on superoleophobic surfaces in oil/air/solid system has been extremely rare. In this work, we describe a convenient approach to fabricate superoleophobic surfaces through perfluorothiolate reaction on Cu(OH)₂ nanostructure surfaces and investigate their possible application in oil droplet transportation. The prepared surfaces exhibit controllable oil adhesive force depending on surface nanostructures or external preloads on the oil droplet. A model of the penetrating Cassie state is used to help analyze the unique phenomena on oil adhesion. Moreover, we provide a proof of demonstrate of oil transportation for application in oil‐based microreactors via our surfaces. Our results give a useful attempt in understanding the fabrication principle of preparing superoleophobic surfaces with controllable oil adhesion.     

基于87LPC767芯片的热泵热水器控制器研制

介绍了热泵热水器的工作原理,并以87LPC767和87LPC762芯片为核心,设计了热泵热水器控制器,分析了其工作原理、硬件电路设计和软件设计流程图.控制器采用双单片机结构,其中主单片机系统负责热泵热水器的数据采集与热泵运行控制,从单片机通过人机接口系统设置热泵热水器运行参数,并实时显示热泵热水器运行状态.主从单片机之间通过串口通信进行数据交换.     

Rapid and Controllable Digital Microfluidic Heating by Surface Acoustic Waves

Fast and controllable surface acoustic wave (SAW) driven digital microfluidic temperature changes are demonstrated. Within typical operating conditions, the direct acoustic heating effect is shown to lead to a maximum temperature increase of about 10 °C in microliter water droplets. The importance of decoupling droplets from other on‐chip heating sources is demonstrated. Acoustic‐heating‐driven temperature changes reach a highly stable steady‐state value in ≈3 s, which is an order of magnitude faster than previously published. This rise time can even be reduced to ≈150 ms by suitably tailoring the applied SAW‐power excitation profile. Moreover, this fast heating mechanism can lead to significantly higher temperature changes (over 40 °C) with higher viscosity fluids and can be of much interest for on‐chip control of biological and/or chemical reactions.     

A Hyperthermia System Using a New Type of Inductive Applicator

A hyperthermia system working at frequencies around 150 MHz is described. It is useful for a penetration depth of 3-4 cm in tumor and muscle tissue. The system includes a new type of inductive applicator giving a beam-like distribution in the tissue, a controllable surface cooling system, and multipoint temperature measurements. A phase I clinical study shows the efficacy of the system, but also the importance of temperature measurements at many points since, in general, the temperature gradients are large.     

Microwave Combustion for Rapidly Synthesizing Pore‐Size‐Controllable Porous Graphene

Porous graphene has been widely applied in energy storage, electrocatalysis, photoelectron devices, etc. However, the producing process for porous graphene usually needs long time and is a tedious step. In this work, porous graphene is prepared with controllable pore size by using active metal nanoparticles to catalytically oxidize carbon under microwave combustion process within tens of seconds. The ion exchange membrane based on porous graphene with ≈5 nm pore diameter exhibits a great performance for salinity gradient power generation application with a power density output of ≈1.15 W m^?2. This work highlights a new strategy for the design and synthesis of pore‐size‐controllable porous graphene and provides new opportunities for 2D porous nanomaterials.     

基于振弦式传感器测频系统的设计

设计了一种基于振弦式传感器的测频系统,介绍了振弦式传感器的工作原理,详细介绍了测频系统的设计思想、硬件电路组成及工作原理和软件设计流程。本测频系统具有硬件电路简单、激振可靠、激振频率可控、信号灵敏度高等特点,大大缩短了现场测量与计算时间,减轻了劳动强度,提高了测量计算准确度。     

Preparation and characterization of size controllable spherical silver nanoparticles

By adjusting pH values of reactant system, the mass ratio of stabilizer/water and aging temperature, size controllable spherical silver nanoparticles （NPs） were synthesized. The properties of silver NPs are characterized by X-ray diffrac- tion （XRD）, transmission electron microscope （TEM） and ultraviolet visible （UV-VIS） absorption spectra. Within the pH values of 7.0-11.0, the aging temperature of 80℃ is better to improve silver NPs in shape to nearly sphere, con- centrate size distribution and reduce aggregation than the aging temperature of 25 ℃. The shape and dispersibility of silver NPs are the best when the pH of the reactant system is within 7.0---8.0. With pH of 7.5, aging at 80 ℃, and sta- bilizer/water mass ratio of 1%, the spherical silver NPs with sizes of 50---70 nm were synthesized. The results are promising to be used to synthesize core/shell NPs when silver NPs are as core.     

证券交易网络系统的可靠性与硬件实现

证券交易网络系统的主要功能是进行证券交易数据的传输、维护和计算,要求具备很高的实时性和可靠性。文章介绍了该系统的组成结构和技术特点,并从提高系统可靠性的角度出发,提出了具体的解决途径,实践证明方法是行之有效的。     

水填充太赫兹空芯布拉格光纤温度特性研究

空芯太赫兹(Terahertz,THz)光纤因其损耗低 和易集成功能材料等优点是当前 研究热点。液态水在太赫兹频段具有的独特性质使其在太赫兹辐射、传感和器件等方面具有 多种潜在应用。本文设计一种带有水缺陷层的太赫兹空芯布拉格光纤(hollow core Bragg fiber,HCBF),并采用有限元法分析了其温度特性。结果表明,设计的太赫兹光纤在0.34 THz到0.44 THz频段内存在明显的温度可调的吸收峰,且限制损耗随 着水温的升高而增加。 同时,光纤具有较高的核芯功率比,其值均大于98.6%。本文所研究 的水填充太赫兹光纤在 研究太赫兹与液体相互作用、太赫兹调控器件等领域具有潜在的应用价值。     

基于MSP430F169的深海环境数据采集系统设计

为解决深海环境信息采集问题.介绍一种基于MSP430F169的数据采集系统.本系统可实现对温度、盐度、压力等信息的采集和存储.并可上传至上位机.通过人机界面进行动态曲线显示、数据分析.系统采样精度高.功耗低.一次充电可长期工作.并给出以MSP430F169为核心的硬件电路图和关键源程序.经过海洋实验证明.此系统可以完成...