浅析HPT250轧机中滑移系数对轧制过程的影响

通过HPT250轧机在技术改造中遇到的一个问题，即滑移系数对冷轧元缝钢管在轧制过程中所起的作用。在实际生产中经过不断的技术研究和改进。使闲置多年的HPT250轧机为钢管公司的生产迭拉起到很大的作用。     

家庭智能终端系统的硬件设计与实现

随着生活水平的提高,人们对居住环境的舒适性、安全性要求不断提高。家庭自动化、智能化已经成为自动化领域的一个发展热点。本文将当前比较先进的ARM技术运用到家庭智能终端系统的开发上,设计实现了一个既适合当前家庭需要又符合今后发展方向的家庭智能终端体系结构,较好地解决了绝大多数智能家居系统所普遍存在的实时性差、安全性低等问题。     

高清嵌入式系统中的DVI驱动开发

以飞思卡尔半导体的MX51为系统硬件平台,给出了高清嵌入式产品中DVI视频显示接口的实现方案;通过处理器的LCD1接口,外扩TFP410芯片实现DVI视频输出;分析了framebuffer的实现机制及其在驱动中的应用;详细讲述Linux2．6．28内核下基于framebuffer开发DVI驱动的方法及步骤。该设计应用于高清机顶盒等产品中,效果良好。     

Ionic liquids as electrolytes

Salts having a low melting point are liquid at room temperature, or even below, and form a new class of liquids usually called room temperature ionic liquids (RTIL). Information about RTILs can be found in the literature with such key words as: room temperature molten salt, low-temperature molten salt, ambient-temperature molten salt, liquid organic salt or simply ionic liquid. Their physicochemical properties are the same as high temperature ionic liquids, but the practical aspects of their maintenance or handling are different enough to merit a distinction. The class of ionic liquids, based on tetraalkylammonium cation and chloroaluminate anion, has been extensively studied since late 1970s of the XX century, following the works of Osteryoung. Systematic research on the application of chloroaluminate ionic liquids as solvents was performed in 1980s. However, ionic liquids based on aluminium halides are moisture sensitive. During the last decade an increasing number of new ionic liquids have been prepared and used as solvents. The general aim of this paper was to review the physical and chemical properties of RTILs from the point of view of their possible application as electrolytes in electrochemical processes and devices. The following points are discussed: melting and freezing, conductivity, viscosity, temperature dependence of conductivity, transport and transference numbers, electrochemical stability, possible application in aluminium electroplating, lithium batteries and in electrochemical capacitors.     

基于VC和三菱MX组件的数据采集系统

介绍了在VC++6.0环境下,利用三菱MX组件实现工业控制计算机与三菱Q系列PLC的通信的方法。该系统完成了数据的实时采集和动态显示,为用户提供了一个可视化的界面,并将数据通过ADO接口保存到数据库中。本文主要阐述了利用MX组件进行编程的一般方法和相关要点。     

基于AT89C52单片机CAN总线节点的设计

介绍了基于AT89C52型单片机CAN总线的节点设计方法,详述了其硬件结构、软件设计和工作原理。重点对设计中的多种现场信号数据采集部分和节点实现过程中应注意的一些问题进行比较详细的介绍。本方案提出的节点,可供交流,参考。     

便携设备中嵌入式Linux电源检测驱动开发

针对便携设备中的电源使用要求,提出了电池电量检测、外部电源检测的低成本解决方案.采用飞思卡尔半导体的MX27处理器,设计了嵌入式Linux2.6内核下的设备驱动程序,分析了Linux2.6内核中新的驱动管理和注册机制,讨论了platform_device及platform_driver的定义和使用方法.该解决方案在实际...     

基于SoC及射频卡定位技术的天车物流子站设计

以凤宝炼钢厂物流管理系统的物流子站的设计为例,详细介绍了该物流子站的结构及工作原理,重点介绍了SoC的特点、射频卡的定位原理、读卡器的设计、称重传感器信号解调及安装等关键技术,最后给出了该物流子站的软件设计。实际应用表明,该物流子站具有抗扰能力强、通信误码率低、响应速度快、维护方便等特点。     

基于DSP的机动车抗眩目系统设计

为了解决车辆在夜间行驶时,对面车灯给驾驶员造成的眩目问题,提出了一种机动车抗眩目系统的设计方案.采用视频解码芯片SAA7111A和视频编码芯片AL250完成视频信号的A/D和D/A转换;利用数字信号处理器DSP对亮度值过高的像素点进行消亮处理,以达到抗眩目的目的;可编程逻辑器件CPLD完成对整个系统的逻辑控制以及提供存储器写数据的地址.系统经实际运行,性能稳定,抗眩目效果明显.     

Influences of a New Admixture MX on Concrete Durability

The performance of concrete with a new admixture MX was studied by using the freeze-thaw cycle, permeability aud chemical attack test. The experimental results show that MX improves the durability of concrete. Within the optimum proportion ranges from 0. 1% to 1% , the compressive strength of concrete after freezethaw is increased by 20%- 50% , and Young‘ s modulus can be increased by 3.76- 5.64 times. The strength aud weight loss of concrete with 0. 4% MX are respectively decreased by 28% and 60% after hydrochloric acid attack.The strength aud weight loss of concrete with 0. 4% MX are decreased by 5%- 20% after sulfuric acid aud sodium sulfate attack. The permeability of concrete with 1% MX at 28 days can be decreased by more than 30% . The investigation of the negative temperature property of MX aud analysis on concrete composition and microstructure by MIP reveal that the heat couduction is resisted aud the freezing procedure of solution in concrete pore is retarded due to the adding of MX. Moreover, the pore structure of concrete with MX is improved, thus improving the durability. Bated on this study, a resistance model of MX to block the heat aud mass transference was proposed, and the mechanism of durability improvement of concrete with MX was explained.