Resisting coking and sulfur poisoning of double perovskite Sr2TiFe0.5Mo0.5O6–δ anode material for solid oxide fuel cells

Development of high performance anode materials with resisting coking and sulfur poisoning is significant for the practical application of solid oxide fuel cells (SOFCs). Here we report a nickel-free double perovskite anode material Sr₂TiFe_0.5Mo_0.5O_6–δ (STFM05), which exhibits excellent electrochemical performance using H₂ as fuel and acceptable electrochemical stability in syngas fuel containing H₂S. At 800 °C, the STFM05 anode shows the electrical conductivity value of 22.3 S cm^?1 in H₂ and the maximum power densities of 547 and 215 mWcm^?2 with electrolyte-supported cell using H₂ and syngas as fuels, respectively. The single cell with STFM05 anode shows a relatively stable electrochemical performance in syngas at 750 °C, and no carbon deposition is detected by Raman spectroscopy. In addition, STFM05 anode is thermally and chemically compatible with the La_0.9Sr_0.1Ga_0.8Mg_0.2O_3?δ and Ce_0.8Sm_0.2O_1.9 electrolytes in reducing atmosphere. These preliminary results suggest that the STFM05 double perovskite is a promising candidate of anode material with coking resistance and sulfur tolerance for use in SOFCs.     

靶向肿瘤新生血管唑来膦酸阳离子隐形脂质体抗肿瘤作用的研究

目的:研究APRPG（Ala-Pro-Arg-Pro-Gly）修饰的隐形唑来膦酸阳离子脂质体对荷前列腺癌PC-3裸鼠的抗肿瘤作用。方法: 构建荷前列腺癌PC-3裸鼠模型,比较研究唑来膦酸阳离子脂质体、APRPG修饰的隐形唑来膦酸阳离子脂质体对肿瘤体积增长的抑制作用,计算肿瘤抑制率,并通过免疫组化实验分析其对肿瘤相关因子血管内皮生长因子（VEGF）和分化抗原簇44（CD44）表达的影响。结果: 唑来膦酸阳离子脂质体、APRPG修饰的隐形唑来膦酸阳离子脂质体对荷前列腺癌PC-3裸鼠的肿瘤抑制率分别为31.81%、68.18%,后者的肿瘤抑制率明显高于前者（P<0.05）,免疫组化结果显示VEGF和CD44蛋白在模型对照组中表达呈强阳性,在唑来膦酸阳离子脂质体组中呈中度阳性表达,而在APRPG修饰的隐形唑来膦酸阳离子脂质体中表达较为微弱。结论:APRPG修饰的隐形唑来膦酸阳离子脂质体对前列腺癌PC-3裸鼠具有更强的肿瘤抑制率。     

应用便携式快速水质检测仪测定废水中的六价铬

采用二苯碳酰二肼分光光度法利用便携式快速水质检测仪测定废水中的六价铬,具有方便快速的特点,通过数理统计t检验发现,与国标方法二苯碳酰二肼分光光度法(GB7467-87)相比,没有显著性差异。     

一种新型循环冷却水系统生物处理技术

本文介绍了一种采用由微生物及酶制剂组成的生物酶水质稳定剂对循环冷却水系统进行处理的技术。循环冷却水系统中投加一定量的生物酶水质稳定剂,通过生物酶及微生物的作用,能起到除垢、防锈、降低有机物含量、抑制菌藻生长等作用,是一种新型的环保的循环冷却水生物处理技术,在循环水系统节能减排、可持续发展的应用中意义重大。     

Surface modification of polythiophene and poly(3‐methyl thiophene) films by graft copolymerization

Polythiophene (PTH) and poly(3‐methyl thiophene) (PMT) films were electrochemically polymerized in an electrolyte solution of boron fluoride–ethyl ether. Ozone‐pretreated PTH and PMT films were subjected to UV‐light‐induced graft copolymerization with different monomers, including poly(ethylene glycol) monomethacrylate, acrylic acid, and glycidyl methacrylate. Surface grafting with the hydrophilic polymers gave rise to more hydrophilic PTH and PMT films. The structure and chemical composition of each copolymer surface were studied by X‐ray photoelectron spectroscopy. The surface grafting with the hydrophilic polymers resulted in a more hydrophilic PTH film. The dependence of the density of surface grafting and the conductivities of the grafted PTH and PMT films on the ozone pretreatment was also studied. A large amount of the grafted groups at the surface of the PTH and PMT films remained free for further surface modification and functionalization. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

橘红茶香气特征及风味成分分析

运用定量描述分析法、顶空固相微萃取法、气相色谱-质谱-嗅闻（gas chromatography-mass spectrometry-olfactory,GC-MS-O）联用仪,并结合多元统计方法分析橘红茶及其原料的主要香气轮廓及挥发性风味成分。结果表明,橘红茶的主体香气是果香和甜香。GC-MS共鉴定出92?种挥发性物质,其中醛类23?种,醇类23?种,烯类20?种,酮类9?种,酯类9?种和其他类8?种,烯类和醇类是主导香气化合物。综合GC-O及气味活度值分析,柠檬烯、β-紫罗酮、芳樟醇、癸醛、β-大马烯酮、(E,E)-2,4-癸二烯醛和辛醛可能是橘红茶中重要的致香物质。相关性分析结果表明,月桂烯、苯乙醛、芳樟醇等11?个挥发性成分对果香、花香、甜香、青香和木香风味属性的表征有较大的贡献。通过正交偏最小二乘判别分析得出了橘红茶与其原料间的标志差异性挥发性成分。本实验可为研究橘红茶及其他柑橘代用茶的香气质量提供参考依据。     

PP/POE/滑石粉复合材料的制备及其在汽车内饰件中的应用

通过分析聚丙烯(PP)和乙烯-辛烯共聚物(POE)的流变特性,选用熔体黏度相近的材料作为基体,以滑石粉为填料,制备了PP/POE/滑石粉复合材料.研究了螺杆组合、助剂种类对复合材料性能的影响,并利用扫描电子显微镜观察了POE和滑石粉在复合材料中的分散情况,考察了该复合材料在改善汽车内饰件外观中的应用状况.结果表明,合适...     

计算机房零地电压偏高的成因及解决办法

通过分析线性负载与非线性负载的电流波形差异并模拟三相供电计算机房的工作状态,用示波器观察零线、相线的电压与电流波形及相位关系,结果表明:电流有效值相等的微机与纯电阻负载相比,电流峰值是线性负载的2.12倍,电流导通角仅40°左右,三相电流在时间轴上没有重叠部分,零线电流为三相电流之和,零地电压等于三相电流有效值之和与零线电阻的乘积。提出了增大供电线路截面积为降低零地电压、改善供电质量的最有效办法,相线宜增大到线性负载时的2倍以上,零线增大到6倍以上。     

多孔型纵横凝结换热表面的性能研究

该文提出了一种新型凝结换热表面-多孔型纵槽表面,通过对该表面与普通光滑表面进行的对比实验研究。得出应用该表面进行凝结换热可明显提高传热效果。是一种强化凝结换热的新方法。将多孔型纵槽表面应用于太阳能热泵系统可增强冷凝器的换热效果,对提高太阳能热泵系统性能和能源的有效利用率具有积极的意义。此外,文章还从工程实际应用出发,简单分析了多孔型纵槽管冷凝器在太阳能热泵系统中的应用前景。     

Laser Remelting of Plasma Sprayed NiCrA1Y and NiCrAlY-A12O3 Coatings

Two types of plasma sprayed coatings (NiCrAIY and NiCrAIY-AI2O3) were remelted by a 5 kW cw CO2 laser. With increasing laser power and decreasing traverse speed in the ranges of 200～700 W and 5～30 mm/s respectively, the melted track grew in width and depth. In the optimum range of laser parameters, a homogeneous remelted layer without voids, cavities, unmelted particles and microcracks was formed. On the surface of remelted layers, AI2O3 and YAIO3 were detected.As a result of isothermal oxidation tests, weight gains of laser remelted coatings were obviously lower than that only plasma sprayed, especially laser remelted NiCrAIY-AI2O3 coatings. The effects of laser remelting and incorporation of Al2O3 second phase in NiCrAIY matrix on high temperature oxidation resistance were discussed.