Reduction of NOx from combustion flue gases bysuperimposed barrier discharge plasma reactors

NO_x reduction from combustion flue gases by superimposed barrier discharge plasma reactors is experimentally investigated. The experiments are conducted for applied voltages from 0 to 28 kV, flue gas rates from 0.5 to 2 L/min, ammonia mixture concentrations from 0.7 to 2.65 stoichiometry, and applied voltage phase differences from 0° to 180°, where two 60-Hz AC power supplies are used. The results show the following: (1) NO_x reduction rate decreases with increasing discharge power for surface discharge operations, however, NO_x reduction rate increases with increasing discharge power for silent and superimposing discharge operating modes; (2) NO_x reduction rate increases with increasing discharge power, gas flow rate and ammonia stoichiometry under in-phase operations; (3) NO_x reduction rate for out-of-phase operations is much higher compared with in-phase operations, however, NO_x reduction rate has an optimum condition on ammonia stoichiometry, discharge power, and gas flow rate; and (4) energy efficiency of NO_x reduction increases with increasing ammonia mixture and gas flow rate and decreases with increasing discharge power     

The effect of low-molecular-weight species on space charge andconduction in LDPE

We have investigated the effect of low-molecular mass species on the space charge behavior such as space charge distribution and electrical conduction of LDPE (low density polyethylene). We also attempted to explain the relationship between the space charge distribution and electrical conduction. The heterocharge, conduction current and effective charge mobility decreased when the low-molecular-mass species in LDPE was removed. It was found that the decrease in conduction current was related to the decrease of heterocharge in LDPE     

大型电力系统的分层并行处理

在解大型线型线网络方程中，本文所研究的分层并行处理是相对稀疏矩阵法的另一种选择。如果Ｎ是电力系统的节点数，那么，这种方法的最大计算理（它与计算机处理所需时间相关）近似正比ｌｏｇＮ分层并行处理所计算的结果与直接求系统矩阵逆的方法所计算的结果是完全一致的。在计算中，每个处理器只需访问很少的内存，由于在本地内存之间传递数据是分层进行的，所以不会产生任何数据传输问题。     

焦化废水中多组分酚的因子分析—岭回归-光度法同时测定

根据3-甲基-2-苯并噻唑腙(MBTH)与酚类发生偶合显色反应而生成有不同颜色的稳定配合物的特点,测定废水中酚类混合体系的吸收光谱,结合因子分析和岭回归技术对工业废水中苯酚、邻甲酚、3,4-二甲酚、2,3-二甲酚、邻苯二酚等多组分酚的光谱数据进行解析,成功的确定了废水中酚的物种数,物种种类及各物种含量.     

温度场的数值模拟法在干式电力变压器热设计中的应用

建立了干式变压器二维非稳态温度场的数学模型，采用有限差分布方法来求解变压器一相的温度场，分析计算了铁心，低压绕组，高压绕组的温升特性及整体温度分布和最热点位置。     

影响滚子链疲劳寿命的主要因素

对链板材料的疲劳强度、链板孔表面加工质量、链板应力集中、整链预拉强化、链板喷丸强化等影响滚子链疲劳寿命的规律进行了深入的研究，给出了提高滚子链疲劳寿命的工艺参数。     

外包钢框架节点抗剪强度分析

本文根据外包钢框架节点在单调荷载下的抗剪试验，分析了节点核心区在开裂状态到极限状态的抗剪强度，提出了各主要抗剪因素的抗剪强度计算公式。     

RC框架外包钢节点角钢延伸的研究

本文根据对角钢在节点核心区边缘处截断的对比试件的试验，分析了不同类型节点的破坏特点、抗剪机理以及抗剪强度；证明角钢在核心区外的延伸是保证角钢销栓力的必要条件。     

脉冲多弧离子源引弧效率的定量检测与过程控制

介绍了一种应用于脉冲多弧离子源镀膜过程控制的电子监控装置．用该装置定量检测脉冲多弧离子源的引弧效率，克服了因停弧带来的膜厚误差的缺点．本文主要叙述了该装置的工作原理及有关电路．     

连续开采下上覆岩层移动的离散元模拟

采用离散元法对走向长壁工作面上覆岩层移动和地表沉陷进行了动态分析和模拟，探讨了离散单元法参数选择问题。通过实例分析，计算结果与实测结果基本一致，并探讨了下沉系数与回采区段尺寸的关系