基于冷原子吸收分光光度法的热解析-低温等离子体脱汞技术研究

研究含汞土壤的修复问题,采用热解析和低温等离子体综合技术探究新途径,调整温度、添加剂、时间等因素来判断脱汞效果并探究其不同形态,分析工艺过程废料的内部联系,并对废气处理进行分析实验。结论如下：(1)通过改良技术的BCR连续萃取法,得出研究区汞的形态主要为有机结合态(53%)。之后依次是氧化物结合态(33%)、酸可提取态(8%)、残渣态(6%)。(2)温度对热解析程度影响较大。在500℃以上的热解析条件下,土壤中的汞浓度不足1.5 mg·kg-1。(3)当选用400℃的解析温度时,40 min汞去除总体完成。在低于1 700 mg·kg-1的浓度下,汞去除率随着土壤中的含量的增大而减小。(4)氯化钙对于热解析的促进作用最强,柠檬酸、升华硫也有一定作用,硫化钠对于汞去除形成阻滞。(5)低温等离子体的最佳状态是电源设置电压为22 kV,频率为660 Hz。整个系统的汞去除程度可达近90%。     

轴流式射频PCVD沉积质量分布的动力学分析

在用静电探针诊断了轴流式射频等离子体激活化学汽相沉积(PCVD)反应器中等离子体电子温度、电子密度轴向分布的基础上,提出与主要工艺参数相联系的二元流体动力学模型。以等离子体参量的轴向分布和变化规律为中介量,从动力学的角度分析主要工艺参数影响PCVD沉积质量分布的规律。将模型用于沉积SnO₂薄膜的过程,理论计算与实验结果符合较好。 关键词：     

CCl自由基A 2Δ←X 2Ⅱ跃迁REMPI光谱研究

在271～279 nm波长范围内采用REMPI技术研究CCl自由基的A 2Δ光谱.实验观察到12C35Cl以及同位素分子12C37Cl 的A 2Δ←X 2Ⅱ1/2,0-0,1-0和2-1跃迁谱带,其中2-1的跃迁为新观察到谱带.获得了A 2Δ←X 2Ⅱ1/2电子跃迁0-0,1-0,2-1谱带的同位素位移.     

Hibert空间中广义框架的非交性

引入了Hilbert空间H中广义框架的非交性、强非交性,讨论了它们的一些性质;并且引入了保非交算子、强保非交算子,证明了酉算子、可逆算子是强保非交算子,下有界算子、余等距算子是保非交算子.     

Charge Transport and Magnetotransport Properties of Polyimide Irradiated by 80keV Co Ions

Charge transport properties of polyimide films implanted with 80 keV Co ions at two different fluences （series I： 1.25 × 10^17 ions/cm^2, series Ⅱ： 1.75 × 10^17 ions/cm^2） are studied in detail. For series I, the temperature dependence of surface resistivity fits Mott＇s equation very well. It is on the insulating side of the insulator-metal transition （IMT）. However, for series Ⅱ, the temperature dependence of surface resistivity is not in agreement with Mott＇s equation. It is on the metallic side of lMT. The magnetotransport properties of these two series are also studied. No significant magnetoresistive effect is observed for series I at both 5 K and 300 K. For series Ⅱ, an obvious magnetoresistive effect is observed at 5 K, while there is no magnetoresistive effect at 300 K. Rutherford backscattering spectrometry （RBS） is applied to confirm the actual fluence for these two series.     

All-Solid-State Nd:YAG Laser Operating at 1064nm and 1319nm under 885nm Thermally Boosted Pumping

We report a high-effciency Nd：YAG laser operating at 1064 nm and 1319nm, respectively, thermally boosted pumped by an all-solid-state Q-switched Ti：sapphire laser at 885 nm. The maximum outputs of 825.4 m W and 459.4mW, at 1064nm and 1319nm respectively, are obtained in a 8-ram-thick 1.1 at.% Nd：YAG crystal with 2.1 W of incident pump power at 885nm, leading to a high slope efficiency with respect to the absorbed pump power of 68.5% and 42.0%. Comparative results obtained by the traditional pumping at 808nm are presented, showing that the slope efficiency and the threshold with respect to the absorbed pump power at 1064nm under the 885nm pumping are 12.2% higher and 7.3% lower than those of 808rim pumping. At 1319nm, the slope efficiency and the threshold with respect to the absorbed pump power under 885nm pumping are 9.9% higher and 3.5% lower than those of 808 nm pumping. The heat generation operating at 1064 nm and 1319 nm is reduced by 19.8% and 11.1%, respectively.     

燃煤锅炉粉煤灰中痕量元素赋存形态研究

本文运用改进的Tessier法对某燃煤电厂静电除尘器收集的三个电场的粉煤灰进行分级提取(SEE)实验研究.SEE实验将粉煤灰中的重金属分为五个存在形态进行分级提取:水溶态(pH=7),酸溶态(pH=5),氧化物结合态,难还原态及残渣态.试验结果表明,残渣态在ESP除尘器所收集的飞灰中含量占据绝大部分;在容易迁移的离子可交换态和酸溶态中,所研究的痕量重金属元素均呈现出FA1相似文献   

甲醇裂解气对点燃式发动机性能影响研究

以一台点火式电控发动机为研究对象,采用废气余热制氢装置,研究了甲醇裂解气对点火式发动机性能的影响.研究表明:裂解气的稀燃范围十分宽泛,可实现稀薄燃烧;通过稀燃可使NOx排放较原汽油机降低90%,CO几乎接近零排放,而HC排放接近汽油.同时,稀燃也使裂解气发动机在保持原汽油机动力性的条件下,获得了较好的燃料经济性,容积替换比最小可以达到了1.48.该方法为实现甲醇高效清洁燃烧提供了切实可行的技术方案.     

关于Banach空间中凸泛函的广义次梯度不等式

本文在前人^[1,2]的基础之上，以凸泛函的次梯度不等式为工具，将Jensen不等式推广到Banach空间中的凸泛函，导出了Banach空间中的Bochner积分型的广义Jensen不等式，给出其在Banach空间概率论中某些应用，从而推广了文献[3—6]的工作．     

LD抽运腔内和频571.6 nm连续波黄光激光器

报道了全固态连续波571.6 nm黄光激光器.黄激光是分别由两片Nd∶YAG的1 444 nm和946 nm谱线非线性和频产生,两条谱线在各自晶体对应能级跃迁分别为4F3/2-4I15/2和4F3/2-4I9/2.实验中采用复合腔结构,利用RTP晶体II类临界相位进行内腔和频,当注入到两片Nd∶YAG晶体的抽运功率分别为25 W和14.8 W时,获得562 mW的连续波571.6 nm黄激光输出,4 h功率稳定度优于±2.9％.