水泥窑炉协同处置城市生活垃圾技术的控制过程及实施效果(中)

正(上接第8期第68页)以5 000t/d水泥生产系统处理150t/d的筛上可燃物为例,根据筛上可燃物不同干基热值和水分计算出对分解炉系统的热量贡献情况可以看出(见图5),当筛上可燃物干基热值为6 000kJ/kg时,如含水量60%,对分解炉热系统为负贡献;在热值为10 000kJ/kg时,如含水量     

TDC3000集散控制系统在氨合成系统中的应用

文章分析了合成塔床层温度的主要干扰;TDC3000系统构成以及氨合成系统中的重要控制方案。     

基于DSP的步进电机细分驱动系统设计

介绍了基于TMS320 F2806芯片控制的步进电动机的细分驱动系统,利用电流合成矢量的旋转法实现了高精度细分方案.开发了两相混合式步进电机的硬件电路,反馈部分采用了高精度的电流互感器对电流采样;实现了控制系统的电流闭环PI调节算法.最后,对系统进行了实验研究,表明该系统运行平稳,电流波形良好,噪声低,定位精度高.     

等边角型材带侧压型材拉弯的力学与回弹分析

对等边角型材侧压转台拉弯的侧压区进行力学分析，通过侧压力与压入深度的关系式及外力平衡关系式联立求出压入深度，继而确定受压区出口处纵向应力状态，然后求出内弯矩，计算出侧压力与回弹半径关系理论曲线，并对理论与试验结果进行了对比讨论。     

Characteristics of plasma in a novel laser-assisted pulsed plasma thruster

A novel laser-assisted pulsed plasma thruster (LA-PPT) is proposed as an electric propulsion thruster, which separates laser ablation and electromagnetic acceleration. It aims for a higher specific impulse than that achieved with conventional LA-PPTs. Owing to the short-time discharge and the novel configuration, the physical mechanism of the discharge is unclear. Time and spatial-resolved optical emission spectroscopy was applied to investigate the variation in the plasma properties in the thruster discharge channel. The plasma species, electron temperature, and electron density were obtained and discussed. Our investigation revealed that there were H_α, H_β, H_γ, H_ε atoms, C I, C II, C III, C IV, Cl I, Cl II particles, and a small amount of CH, C₃, C₂, H₂ neutral molecular groups in the plasma. The electron temperature of the discharge channel of the thruster was within 0.6–4.9 eV, and the electron density was within (1.1–3.0) $\times $ 10¹⁸ cm⁻³, which shows that the optical emission spectroscopy method is to measure the electron excitation temperature and electron density in heavy particles. But the Langmuir probe method is to measure the temperature and density of free electrons. The use of laser instead of spark plug as the ignition mode significantly changed the plasma distribution in the discharge channel. Unlike the conventional PPT, which has high electron density near the thruster surface, LA-PPT showed relatively large electron density at the thruster outlet, which increased the thruster specific impulse. In addition, the change in the ignition mode enabled the electron density in the LA-PPT discharge channel to be higher than that in the conventional PPT. This proves that the ignition mode with laser replacing the spark plug effectively optimised the PPT performance.     

宽带卫星多媒体系统与下一代网络的互连与集成

BSM是现有宽带卫星IP系统的代表．致力于卫星通信与互联网的结合．使得陆地IP网络协议可以应用于卫星系统。而NGN提出了下一代通信网络的特点与要求,这将成为通信系统未来发展的趋势。BSM与NGN的结合将对卫星通信的发展产生重要影响,本文将对BSM与NGN的功能架构做简要介绍,并针对BSM与NGN的互连与集成的适应性做介绍与分析。     

2099铝锂合金型材热态下材料性能

对2099铝锂合金型材在120℃~160℃温度范围内的单向拉伸进行试验,通过分析屈服极限、强度极限等材料性能发现,在温度150℃时最利于型材成形;计算得出了描述材料本构关系的Holloman模型和Swift模型,两种模型的比较表明,Swift模型对2099铝锂合金型材的材料性能描述得更为精确。     

同煤钢铁公司450 m3高炉炉况恶化后的处理

分析了同煤钢铁公司450m^3高炉炉况恶化的原因，详细介绍了对炉况恶化各阶段的处理情况。通过采取一系列措施。高炉逐步恢复正常。     

高压低渗透油藏多元解堵技术的研究与应用

针对卫 79断块属高压低渗油藏 ,储层物性差、孔喉半径小、注水压力高、注水效果差、地层亏空严重、能量不足 ,导致油井普遍供液不足、提液困难大、产量递减快的现状 ,提出了六种新的油层解堵工艺技术 ,通过多元解堵工艺的综合实施 ,使油藏开发指标得到较大改善 ,为高压低渗油藏的后期开发指出了新的综合治理方法