反应脉冲激光淀积硫化铅膜的SEM和XPS研究

以扫描电镜和Ｘ射线光电子能谱等多种测试手段研究分析了用反应脉冲激光淀积技术制备的ＰｂＳ薄膜。分析结果表明，利用该淀积方法可以得到附着力好，符合化学计量比的硫化铅薄膜。     

Coupled Ablation and Heat Transfer Analysis of Lower Head for Reactor Pressure Vessel under Severe Accident Condition

After a reactor core melts accident, the solid wall of the reactor pressure vessel (RPV) will be inevitably eroded by the melting core which contains large density of heat flux. The analysis of the coupled ablation and heat transfer of the lower head for RPV is of great theoretical significance to the effectiveness demonstration of water injection in reactor pit and the confirmation of the residual wall thickness of RPV. In this work, numerical simulations were carried out based on the RPV model of CPR1000 using the CFD software FLUENT 17.2. Based on dynamic mesh model and user-defined function (UDF) redevelopment, a fully coupling calculation model considering the transient ablation and heat conduction of solid wall of RPV, the redistribution of heat flux density in RPV inner wall and the subcooled boiling of RPV outer wall was established. Both two-phase flow pattern in the reactor pit and temperature field of RPV solid wall ablation within 9 000 s were obtained and the minimum residual wall thickness and the occurrence location were determined by analysis. The results show that it is feasible to use dynamic mesh to capture wall ablation. The fully coupling calculation model has certain advantages in analyzing the transient ablation process of RPV under severe accident.     

火电机组火焰检测系统的分析与研究

通过对中储式锅炉、W型火焰燃烧的火电机组火焰检测的基本原理、调整方法以及火焰检测、调整中遇到的问题进行分析与研究,提出一些经验与体会供国内相同类型的机组参考。     

用于火焰探测的紫外光敏管

介绍了用火焰探测紫外光敏管的结构，工作原理和主要技术参数，讨论了紫外光敏管材料及管内工作气氛的选择原则，并对影响紫外光敏管性能参数因素作了讨论。     

Pulsed laser deposition of epitaxial BaxSr1−xTiO3/YBa2Cu3O7 bilayers on LaAIO3 substrates

YBa₂Cu₃O₇/Ba_xSr_1−xTiO₃ bilayers were grown epitaxially on LaA10₃ substrates using the pulsed laser deposition method. A microstructural investigation revealed that all compositions of Ba_xSr_1−xTiO₃ investigated from x = 0 to x = 1 showed (001) orientation and epitaxy across the interface as analyzed by Rutherford backscattering spectroscopy channel yields of < 8% for BaTiO₃ on YBa₂Cu₃O₇ films. Dielectric properties including the dielectric constant, k, and the loss tangent, tan δ, were measured as a function of composition, and it was found that the highest k-values (k = 400) existed for the x = 0.72 composition.     

内燃机用阻燃型空气过滤纸的研制

实验探讨了以十溴二苯乙烷为主体的溴-锑协同阻燃体系中溴-锑元素质量比对空气过滤纸阻燃效果的影响,结果表明,二者最适质量比为3∶1。在此比例下,进一步研究了阻燃剂用量对空气过滤纸阻燃性能、力学性能以及透气性的影响,结果显示,阻燃剂留着率为25%时,阻燃性能达到GB/T14656—1993要求,此时挺度提高了约20%,但耐破度和透气度分别下降了约11%和10%。     

氮-磷-氯型皮革阻燃复鞣剂的合成及应用

选取亚磷酸二甲酯与丙烯酰胺在甲醇钠的催化作用下反应,制得中间体3-二甲氧磷酰基丙酰胺,后再利用中间体与环氧氯丙烷反应,合成出具有复鞣性能的氮-磷-氯皮革阻燃复鞣剂。讨论了反应物配比、反应温度、反应时间等条件对聚合反应的影响,确定了最佳反应条件:中间体与环氧氯丙烷的摩尔比为1.0:1.5,反应温度为100℃,反应时间为6h。将该合成的阻燃复鞣剂施加于皮革复鞣工段,利用阻燃检测法测试皮革的阻燃性能,试验发现,所得皮革制品的氧指数、有焰燃烧时间、无焰燃烧时间、烟密度、燃烧速率,均比未施加阻燃复鞣剂有显著提高,且所得制品在感官指标和力学方面,均比未施加阻燃复鞣剂的皮革有显著提高。     

H2-Ni电池用纳米锆溶胶中硅含量分析方法

运用N2O-C2H2火焰原子吸收光谱法进行氢镍(H2-Ni)蓄电池材料用纳米锆溶胶中硅含量分析方法的研究。介绍硅的最佳分析条件,并在样品测定中对干扰因素进行了综合考虑。实验表明,该方法具有灵敏度高、干扰小、操作步骤简单、容易掌握、分析周期短等特点。样品硅含量的分析其相对标准偏差均小于1.0%(n=10),标准加入回收率在97.0%～102.0%(n=6);达到了实验室仪器分析技术与分析质量的控制要求。     

基于模糊控制的火焰切割自动调高系统的设计

论述了自动调高系统在数控火焰切割系统中的重要性,利用运动控制卡,设计了基于模糊控制的自动调高系统,介绍了模糊控制器的设计过程,实现了模糊控制在数控火焰切割机自动调高系统中的应用.     

螺旋埋弧焊管内焊送丝系统

分析了螺旋埋弧焊管内焊送丝系统的两种形式,对比了新、旧三维调整焊枪机构及其优缺点,论述了软管送丝机构及其优越性。相对于焊枪送丝机构,软管送丝机构能更好地适用于焊管内焊单丝、双丝、多丝焊接,尤其适用于426 mm以上规格的螺旋焊管内焊焊接。软管送丝机构的稳定性为保持焊接参数的稳定提供更好的机械保障,同时使焊炬倾角的调整灵活、方便,是焊枪送丝机构无法比拟的。