碳纳米管补强丁苯橡胶/聚氯乙烯共混物的研究

研究碳纳米管用量对丁苯橡胶（SBR）/聚氯乙烯（PVC）共混物性能的影响。结果表明：碳纳米管微观呈长条状聚集态,聚集体由大量碳纳米管纠缠而成,碳纳米管直径为10～35 nm;随着碳纳米管用量的增大,SBR/PVC共混物的FL,Fmax和Fmax－FL逐渐增大,t10和t90呈缩短趋势,硬度、定伸应力、拉伸强度和撕裂强度逐渐增大,拉断伸长率逐渐减小,当碳纳米管用量为10份时,SBR/PVC共混物的物理性能较优;SBR/PVC共混物的储能模量和损耗模量随着应变的增大而减小,随着碳纳米管用量的增大而增大,损耗因子随着应变的增大而增大,随着碳纳米管用量的增大而呈减小趋势。     

Intensification of low-grade methane enrichment in nitrogen mixture by CH4/CO2 displacement

To solve the problem of CO₂ uncompleted desorption in the process of CO₂ displacement enhancing the adsorption separation of CH₄/N₂, a small amount of product gas CH₄ was used as purge gas to improve the CO₂ desorption. CH₄/CO₂ mixture gas obtained from desorption step was recycled as the displacement gas to enhance the enrichment of low-grade methane in nitrogen mixture. In this work, the research conducted the experiments for CH₄/N₂ separation using CH₄/CO₂ displacement intensification adsorption and the laboratory-made coconut shell activated carbon as sorbent. The mathematical models were built in gPROMS and the accuracy of models was verified by comparison of simulations and CH₄/N₂/CO₂ breakthrough experiments. The performance of enrichment of low-grade methane with displacement intensification using different displacer was compared. The result showed that the process with CH₄/CO₂ displacement had higher purity product than CO₂ displacement. The CH₄/ CO₂ mixed gas replacement enhanced vacuum pressure swing adsorption cycle experiment was carried out, which can jointly enrich 14% CH₄/ N₂ and 53% CH₄/CO₂ to 98.8%, and at the same time obtain a recovery rate of 77.8%.     

溶液除湿系统空气状态影响因素

研究典型叉流式溶液除湿系统中,溶液循环流量（G_cir）、冷/热量（Q_c/Q_h）和系统流程对除湿/再生空气状态变化和除湿效果的影响机制。分析不同工况下空气在焓湿图中的过程曲线特征,比较各因素影响程度。结果表明,在设计条件下,当G_cir约为0.05 kg/s时,溶液除湿系统达到最佳除湿效果;当Q_c、Q_h比例接近,总量由29.4 kW增加至48.9 kW时,系统中除湿量由3.7 g/kg上升至5.7 g/kg;不同流程中,当冷却对象为溶液时,溶液除湿效果较好。相较于溶液除湿系统中G_cir和Q_c/Q_h,溶液除湿流程对空气状态变化和除湿效果的影响程度较大。空气过程曲线在各流程下具有显著特征,溶液除湿流程是影响空气状态变化和除湿效果的核心因素。     

EAST极向场电源系统SVC装置的测试与评估研究

为了满足实验先进超导托卡马克(EAST)高功率、高约束模式下电源稳定运行的需求,同时降低其电网电能质量的影响,EAST极向场磁体电源配套安装了相应的无功补偿及滤波装置静止无功补偿器(SVC).此处针对SVC装置,从运行效果、治理效果、性能分析等方面,对SVC装置进行了综合测试与评估.实验结果表明,SVC装置的综合性能在较大程度上满足电源系统稳定运行需求.     

2-氨基-5-巯基-1,3,4-噻二唑缓蚀剂结构的密度泛函计算

采用密度泛函量子化学计算方法,获得了在B3LYP/6-311 G(2d)(5D,7F)理论水平上2-氨基-5-巯基-1,3,4-噻二唑(简称AMT)4种互变异构体的平衡几何构型、能量和电荷分布,证实了4种互变异构体的所有原子处于同一平面,且有一种异构体最稳定.研究结果表明:AMT4种异构体中的环骨架具有芳香性,AMTc与Cu形成的缓蚀膜层是Cu(Ⅰ)与AMTc中的7N和2S原子分别形成共价键和配位键相互交错而成.计算了AMT4种异构体的谐振频率和红外光谱强度.     

乙二醇水热还原法制备纳米银

利用乙二醇在高温下的还原特性,在水热条件下制备了纳米银粒子,并通过透射电镜、X射线衍射、紫外吸收光谱对其结构进行了表征.研究结果表明:所制备的纳米银具有面心立方相的多晶结构,平均粒径在30nm左右,紫外吸收峰的位置在380 nm左右.分散剂和体系中含水量对纳米银的粒径有一定影响.     

Preparation and photocatalytic activity of nano-TiO2 codoped with fluorine and ferric

Nano-F /Fe^3＋/TiO2 particles were prepared by hydrolysis of tetrabutyl titanate in a mixed CF3COOH-Fe（NO3）3-H2O solution. The photocatalytic decomposition of methylene blue in aqueous solution was used as a probe to evaluate their photocatalytic activities. The powders were characterized by X-ray diffraction （XRD）, energy dispersion X-ray spectrum （EDS） and Brunauer-Emmett-Teller （BET） surface area analysis. The results show that F- and Fe^3＋ are doped into TiO2. The F^- and Fe^3＋ doping can help to enhance the nano-TiO2 photocatalytic activity greatly. The appropriate codoping conditions for F-Fe are n（F）/n（TiO2）=2%, n（Fe）/n（TiO2）=0.05%, and the degradation rate of methylene blue at l h is improved from 73.2% to 87.5%. The codoped nano-F /Fe^3＋/TiO2 particles have higher BET specific surface area, smaller crystallite size and higher photocatalytic activity than those of undoped TiO2 particles.     

化学镀镍溶液光亮剂实验研究

通过大量实验,筛选出了酸性化学镀镍液中光亮剂的最佳配方,并对加光亮剂和未加光亮剂的镀后试片进行热处理,结果表明,加光亮剂镀层的显微硬度,耐磨性、耐蚀性更优越.     

高耐蚀性热镀锌板的钝化处理工艺探讨

介绍了热镀锌板钝化膜的形成机理 ;针对攀钢热镀锌板出现白锈、黑斑等问题 ,分析了钝化液pH值、添加剂及操作条件对钝化膜质量的影响 ,同时提出了改进热镀锌板耐蚀性能的措施     

远场涡流技术检测带翼片管的研究

远场涡流检测对高导电管的管壁上的缺陷非常敏感，具有透壁性。探讨应用远场涡流技术检测带翼片(散热片或金属隔板组件)钢管的有关问题，分析了管外翼片对远场涡流的耦合特性和缺陷信号的影响，得出了翼片响应信号与缺陷信号的关系及缺陷信号的提取方法。