N6000碳弧气刨的安装与调试

介绍了碳弧气刨的工作原理和组成结构.以N6000自动碳弧气刨装置为例,指出电源要求、碳棒的选用、出风口的调整、空气压力、碳棒与工件间的夹角等均会对刨削质量产生影响.并提出了碳弧气刨过程对噪声、弧光以及粉尘的安全防护.     

基于CPLD和DSP的高速外部接口

在了解复杂可编程控制器件（CPLD）和数字信号处理系统（DSP）的基础上,利用CPLD强大的逻辑功能和DSP的高速运算能力,实现对外部接口的高速无缝连接,以提高DSP访问外设的速率,充分发挥其高速运算能力。     

480t／h循环流化床DCS控制若干问题的探讨

在分析480t／h循环流化床锅炉的工艺过程和工艺特点的基础上,介绍了基于DCS控制的CFB锅炉控制系统的组成和功能,详细分析了给煤不畅判断、启动和运行过程中的合理配风、给煤系统的控制、避免炉内床料结块、结焦和煤燃、保护和控制的协调等问题。实际运行结果表明提出的方案解决了CFB锅炉给煤系统出现断煤和堵煤的问题,锅炉燃烧采用给煤、1次风、2次风多变量综合控制,解决了循环流化床锅炉自动难以投入的难题,为机组稳定、可靠的运行打下了基础。     

基于nRF905和MSP430的惯性传感器无线数传系统设计

介绍一种可用于人体跌倒检测的惯性传感器数据无线传输系统,该系统由采集数据的无线传感器节点、接收数据的基站以及监控数据和发配置命令的上位机组成。系统软件采用中断的方法对数据收发实时处理。经测试,上位机和节点之间能够进行可靠性良好、实时性强的数据包和配置命令的无线传输,系统可应用于人体跌倒过程中人体加速度和角速度的实时无线采集。     

Concentration of hepatitis A virus

Cell culture adapted hepatitis A virus (HAV) in 10 and 50 l. of seeded distilled water was respectively concentrated approx. 3300 and 17,000 fold by adsorption-elution on cellulose membrane. HAV (strain CF 53) was adsorbed at pH 4.0 with 0.15 M NaCl to the cellulose filters and eluted by 3% beef-extract at pH 8.5. Eluted virus was further concentrated by precipitation by polyethylene glycol 6000. Hepatitis A antigen (HAAg) was detected by radioimmunoassay and infectious virus was quantified by cell culture titration. The average of HAAg recovery was 76% for 101. and 85% for 501., whereas the average recovery for infectious virus was respectively 89 and 97%. The sensitivity of the method was tested by contaminating 101. with 16 TCID₅₀ only; 63% of initial infectious virus were recovered.     

Microwave dielectric relaxation and molecular dynamics in binary mixtures of poly(propylene glycol) 2000 and poly(ethylene glycol)s of varying molecular weight in dilute solution

Molecular dynamics of binary mixtures of poly(propylene glycol) (PPG) and poly(ethylene glycol)s (PEGs) of varying molecular weight due to molecular interactions, chain coiling and elongation in dilute solution under various conditions, ie varying number of monomer units of PEG, method of mixing of polymers and solvent environment, has been explored using microwave dielectric relaxation times. The average relaxation time τ_o, relaxation time corresponding to segmental motion τ₁ and group rotations τ₂, of a series of binary mixtures of poly(propylene glycol) 2000 and poly(ethylene glycol) of varying molecular weight (ie PPG 2000 + PEG 200, PPG 2000 + PEG 300, PPG 2000 + PEG 400, and PPG 2000 + PEG 600 mixed by equal volume in the pure liquid states, and PPG 2000 + PEG 1500, PPG 2000 + PEG 4000 and PPG 2000 + PEG 6000 mixed equal weights in solvent) have been determined in dilute solution in benzene and carbon tetrachloride at 10.10 GHz and 35 °C. A comparison of the results of these binary systems of highly associating molecules shows that the molecular dynamics corresponding to rotation of a molecule as a whole and segmental motion in dilute solutions are governed by the solvent density when the solutes are mixed in their pure liquid state. Furthermore, the molecular motion is independent of solvent environment when the polymers are added separately in the solvent for the preparation of binary mixtures. It has also been observed that there is a systematic elongation of the dynamic network of the species formed during mixing of pure liquid polymers in lighter environment of solvent with increasing PEG monomer units, while the elongation behaviour of the same species in the heavier environment of carbon tetrachloride solvent is in contrast to the elongation behaviour of the polymeric species formed in pure PEG. The role of rotating methyl side‐groups in the PPG molecular chain has been discussed in term of the breaking and reforming of hydrogen bonds in complex polymeric species for the segmental motion. In all these mixtures, the relaxation time corresponding to group rotations is independent of the solvent environment and constituents of the binary mixtures. The effect of chain flexibility and coiling in these binary mixtures is discussed by comparing the relaxation times of the mixtures with their individual relaxation times in dilute solutions measured earlier in this laboratory. © 2001 Society of Chemical Industry     

SM6000型空压机的故障分析与维护

介绍了4300mm宽厚板SM6000型空压机的结构和组成，论述了空压机常见的故障和解决方法。经过改进后，SM6000型空压机运行平稳，故障明显减少，保证了生产的顺利进行。     

Oxidation Behavior of ODS Alloy MA 6000

MA 6000 is a mechanically alloyed, Ni-base ODSalloy. Excellent high-temperature strength makes it astrong candidate for application in high-temperatureindustrial processes. In order to assess its usefulness for high-temperature structural components,in-depth knowledge of its oxidation behavior,particularly long-term exposure, is necessary. Thepresent work deals with studies of the cyclic andisothermal oxidation of MA 6000 in the temperature range900-1050°C, with emphasis at 1050°C. A fewcomplementary studies have been carried out on the oxideintegrity under creep conditions for exposure times of up to 11,000 hr. The results have shown thatoxidation of MA 6000 involves rather complex mechanismsand alterations of the oxidation behavior still occurafter long-term exposure. Excellent oxidation resistance is based on the formation of an internalcontinuous Al₂O₃ layer.     

基于LabVIEW与ADAM模块的真空树脂灌封监控系统

设计了一种新型的小功率太阳能电池真空树脂灌封监控系统,该系统以ADAM6000模块作为现场数据采集单元,采用Lab VIEW作为软件开发平台,通过Modbus协议实现ADAM6000模块和LabVIEW软件的通信。同时详细介绍了系统架构、硬件设计选型和软件设计配置。     

基于LPC2114的FIRA足球机器人车体控制系统的设计

足球机器人融合了计算机视觉、模式识别、决策对策、无线电数字通讯、自动控制和最优控制、智能体设计、电机传动等多项技术,具有极高的研究价值。设计了基于LPC2114微处理器的FIRA足球机器人车体控制系统,简化了系统设计,提高了系统性能,满足微型足球机器人的控制要求。