基于Qt的一个服务器多个客户端的TCP通信

作为跨平台应用程序和UI开发框架,Qt被越来越多地用于应用程序的开发上。而网络程序又是软件开发的主要内容之一,文中对如何利用Qt开发TCP网络程序进行了研究。通过新建TCPServer类和TCPSocket类,分别继承自Qt里封装好的QTCPServer类和QTCPSocket类,完成服务器和套接字的建立与连接,从而实现了搭建针对多客户端的服务器。     

Effect of Mn doping on hydrolysis of low-temperature synthesized metastable alpha-tricalcium phosphate

In the present work, effect of Mn doping on hydrolysis rate of low-temperature synthesized metastable α-tricalcium phosphate (α-TCP) was investigated. α-TCP powders containing different amount of Mn²⁺ ions (0, 0.5 and 1 mol%) were synthesized by wet co-precipitation process, followed by annealing and crystallization of as-precipitated amorphous calcium phosphate at 700 °C. It was demonstrated that the presence of Mn²⁺ ions significantly retards hydrolysis rate of α-TCP. While pristine α-TCP fully hydrolyzed with a conversion to calcium-deficient hydroxyapatite in 10 h, complete hydrolysis of α-TCP doped with 0.5 and 1 mol% of Mn occurred only after 20 and 35 h, respectively. Initial and final products were characterized by X-ray diffraction (XRD) analysis, infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Chemical composition of starting and fully hydrolyzed α-TCP powders was determined by inductively coupled plasma optical emission spectrometry (ICP-OES).     

极端环境下储库控制系统的通信解决方案

在干旱、高温、潮湿、寒冷等环境中使用宽温的自动化产品一般都能达到要求,但在荒野等极端环境中,没有电力供应,没有网络通信的情况时有发生,进而对自动化系统造成致命性的影响。针对该问题,以土耳其地下天然气储库项目为例,提出了使用太阳能供电,运用卫星进行无线通信的方法实现自动化控制系统的正常运行,成功地解决了该问题。     

Role of Ru on the Microstructural Evolution During Long-Term Aging of Ni-Based Single Crystal Superalloys

Two experimental alloys containing different contents of Ru were investigated to study the effect of Ru on the microstructural evolution during long-term thermal exposure. The increase in Ru promoted the formation of cubical, tiny, and even γ′ phase after full heat treatment. Moreover, the samples after full heat treatment were exposed at 1100 °C for different time. Based on the classical model by Lifshitz, Slyozov, and Wagner, the coarsening of γ′ phase of the alloy containing 2.5 and 3.5 wt.% Ru during the long-term aging was controlled by the interface reaction and diffusion, respectively. The γ/γ′ lattice misfit was more negative with the increment of Ru addition, which induced the formation of stable rafted γ′ phase in the alloy containing 3.5 wt.% Ru at the initiation of long-term aging. Besides, the increase in Ru reduced the diffusion coefficient, which could restrain the γ′ phase coarsening. The lower γ/γ′ lattice misfit of the alloy containing 2.5 wt.% Ru promoted the interface reaction, which induced the rapid coarsening of γ′ phase. Therefore, the increase in Ru improved the microstructural stability of the alloys. On the other hand, the raise of Ru induced “reverse partitioning” behavior, which was effective in suppressing the emergence of the topologically close-packed phase (TCP phase). The TCP phase occasionally occurred in the alloy containing 2.5 wt.% Ru, which was attributed to the high temperature and the supersaturation of the γ matrix. Moreover, the TCP phase was determined as μ phase, which had a high concentration of Co, Re, Mo, and W. A sketch map describing the evolution of the TCP phase was also constructed.     

谈谈门禁系统在地铁中的应用

针对地铁对门禁系统的要求，阐述了它在门禁系统的组成和功能，并在实践中付之以用。     

Toxicity of chlorpyrifos and TCP alone and in combination to Daphnia carinata: the influence of microbial degradation in natural water

The acute toxicity of chlorpyrifos and its principal metabolite 3,5,6-trichloropyridinol (TCP) alone and in combination to a cladoceran, Daphnia carinata, was studied in both cladoceran culture medium and natural water collected from a local suburban stream. TCP was found to be more toxic than its parent chemical chlorpyrifos to Daphnia survival in cladoceran culture medium. However, TCP in natural water was not toxic to D. carinata up to 2 microgL(-1). The LC(50) values for chlorpyrifos, TCP and chlorpyrifos+TCP were 0.24, 0.20 and 0.08 microgL(-1), respectively, in cladoceran culture medium. Although the parent chemicals and their degradation products co-exist in natural waters, the existing guidelines for water quality are based on individual chemicals. The results of this investigation suggest that chlorpyrifos and TCP can interact synergistically, additively or antagonistically, resulting in an increase or decrease in the overall toxicity of the mixture compared to individual compounds. The indigenous microorganisms in natural water could play a significant role in degradation of these compounds thereby influencing their toxicity in receiving waters. This study clearly suggests that the joint action of pesticides and their degradation products should be considered in the development of water quality guidelines. To our knowledge, this is the first study on the interactive effect of chlorpyrifos and TCP to a cladoceran and suggests that these two compounds are non-toxic when present together at concentrations up to 0.12 microgL(-1). However, these compounds together act additively at and above 0.5 microgL(-1) to fresh water invertebrates and therefore pollution with these compounds may adversely affect natural ecosystems.     

基于以太网通讯的手套机网络监控系统

针对现场总线与串行通讯构建的手套机信息网络开放性差、数据传输速度不快、可靠性不高等问题,对基于TCP/IP+Ethernet的网络通信技术以及嵌入式技术等方面进行了研究,提出了一种基于以太网通讯的手套机网络监控系统方案。首先介绍了该系统的结构,包括底层执行端、现场监控端、远程监控端。其次描述了系统的具体设计,主要在以ARM11为控制核心的嵌入式硬件平台上,移植Win CE操作系统,采用C#语言编写基于TCP/IP协议的以太网通信程序以及人机交互应用程序,并在服务器端搭建Web服务器与手套机数据库。最后对手套机网络监控系统的现场实时监控与远程监控进行了测试。研究结果表明,该系统能够对生产车间内的所有手套机进行实时监控与远程监控管理,并且界面美观、操作简单、数据传输快,满足了手套生产企业的要求。     

基于Modbus协议的PLC远程控制

在工业控制中,可编程控制器（PLC）作为工业控制装置已得到广泛的应用。采用高度实时性、高可靠性的PLC通信技术,就成为构成性能优异的自动控制系统的关键所在。Modbus协议是应用于电子控制器的一种通用语言。通过此协议,可实现控制器与其他设备(上位机)之间的远程通信。本设计就是以实验室现有的PLC为对象,实现基于Modbus协议的上位机对PLC的远程控制。实现上位机对PLC的远程控制,最理想的通信媒介就是通常所用的网线,即非屏蔽双绞线（UTP）。这就需要建立在以太网之上,即TCP/IP协议之上的Modbus通信协议。本次设计主要完成了完成了硬件连接及梯形图程序的编写,实现了控制器对输出线圈的控制,在建立PLC与上位机网络通信时,完成了对PLC通信模块的配置和PC机与PLC基于以太网的连接,采用Modbus TCP调试软件进行通信测试,测试结果表明上位机与台达PLC两个从站均可建立稳定的Modbus通信。     

基于SOPC的红外智能视频终端设计与应用

提出了一种基于SOPC的TAU320红外热像仪联网方案。采用美国Altera公司生产的 Cyclone III系列FPGA芯片作为平台,搭建了包含SRAM、W5300多个外设接口的SOPC系统。通过TAU320热像仪 采集视频数据,并将其乒乓存储至SRAM;采取DMA方式读取数据,经W5300网络芯片将其传送至远程PC 机。PC端用于控制硬件电路的工作状态切换以及实现视频显示。本文系统采用TCP协议实现了视频数据传 输,并具有体积小、功耗低、控制灵活等特点。     

基于物联网的照明控制系统—ARM客户端软件设计

针对开发物联网照明控制系统中ARM客户端软件为目的,通过规划WSN协调器与ARM网关的串口通讯协议及ARM客户端与PC服务端的TCP/IP通讯协议,然后基于Windows CE 6.0操作系统,运用C#编程语言开发了ARM的客户端软件。经测试,客户端软件实现了按规划的协议将协调器上传数据发往服务端和将服务端下发数据发往协调器的功能,性能稳定,具有一定的实用价值。