安阳HAM野外设台小记 我们在太行山上

安阳火腿俱乐部自去年11月成立以来,我们几位铁杆HAM一直在挖空心思想:怎样搞一些野外活动,把应急通信融入娱乐之中?使业余活动常规化,近军事化,平日寓练于乐,一旦需要,作到招之即来,来之能战,战之能胜!冬去春来,4月10日,阴天,由     

Electrocatalytic behavior of calcium doped LaFeO3 as cathode material for solid oxide fuel cell

La(1-x)Ca(x)FeO3 (X = 0.0, 0.2, 0.4, abbreviated as LCF) as cathode material for intermediate temperature solid oxide fuel cells (IT-SOFC) was synthesized by new route of glycine nitrate method. LCF materials were characterized by X-ray diffraction (XRD), scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDX), transmission electron microscopy (TEM), electrical and electrochemical impedance spectroscopy (EIS). The powder LCFs exhibited single phase with orthorhombic structure, highly porous and small nanoparticles with average size of 200-300 nm. The electrical conductivities of LCFs increased as increasing the Ca content and achieved the maximum electrical conductivity of 148 Scm(-1) for La0.6Ca0.4FeO3 (X = 0.4) at 550 degrees C. The improved conductivity of LCFs could be a promising cathode material for IT-SOFCs. In the impedance analysis of fabricated symmetry cell with the optimized La0.6Ca0.4FeO3 cathode and Ce0.8Sm0.2O3 (SDC) electrolyte, the minimum area specific resistance (ASR) of 0.15 omegacm2 was observed at 850 degrees C, which may due to the lowest activation energy (1.55 eV), resulting from the reduction of oxygen molecules into oxygen ions. It was found that calcium doping was essential to increase the charge carrier concentration of lanthanum iron oxide materials, resulting in the high conductivity at intermediate temperature.     

滑动磨损表面疲劳的研究

文中研究了圆形针织机三角在滑动磨损中的表面疲劳现象。这些元件控制针织机的针,并受到很高频率的循环载荷,冲击能达到每分钟三万次。对不同使用时期后的三角磨痕研究时,发现了特殊的表面疲劳类型损伤。电子显微镜检查结合应力分析,显示了材料表面组织和磨痕表面组织之间的相互关系状态。已经连续研究了用诸如硬化(淬火)、渗碳、氮化和碳氮共渗等表面处理来减少钢的不同类型的表面损伤,得到了实验室和工业上试验的两者比较的结果。建议采用各种不同型号的表面硬化钢再经适当的热处理来取代经常使用的高铬钢。     

露天矿的火力扩孔

用露天法开采硬岩矿床时,穿孔工作是最繁重、低效和高耗的工序。黑色冶金工业各采选公司露天矿最不利的情况是所采矿岩的普氏坚固性系数一般都在16以上。用国产牙轮钻机在这类矿岩中穿凿直径250mm 的炮孔时,穿孔速度一般不超过7～8m/h,牙轮钻头的最大寿命为80m。在这些条件下,牙轮钻头的平均价格为220卢布时,每米炮孔的穿孔成本约10卢布,而1m~3矿岩的穿孔成本达0.4卢布。由于苏联硬质合金和牙轮钻头十分短     

Effect of season on fatty acid composition and n-3/n-6 ratios of zander and carp muscle lipids in Altinapa Dam Lake

In this study, seasonal variations on total fatty acid composition of carp, Cyprinus carpio, and zander, Sander lucioperca, muscle lipids in Altinapa Dam Lake were determined. Fish samples in 2 seasons (summer and winter) were obtained from Altinapa Dam Lake in Konya, Turkey. Polyunsaturated fatty acids were found to be higher during the cold season than in the hot both in zander and carp. Whereas the Docosahexaenoic acid was high in zander both in summer and winter, in carp it was high only during wintertime. Zander contained more n-3 fatty acids during the cold season compared to carp. Especially, the n-3:n-6 ratios in zander were 3.89 and 3.84 in summer and winter, respectively. In conclusion, seasonal variations affected fatty acid composition of zander and carp in Altinapa Dam Lake.     

Evaluation of biofilm performance as a protective barrier against biocorrosion using an enzyme electrode

Sulfide is known to be an important factor in microbiologically influenced corrosion (MIC) of metals and concrete deterioration in wastewater treatment structures and sewer pipelines. A sulfide biosensor was used to determine the effectiveness of Escherichia coli DH5 alpha biofilm as a protective barrier against MIC. The biofilm was shown to be effective in protecting surfaces from sulfide and helping to reduce MIC using amperometric measurements. The results also indicated that the growth conditions of E. coli DH5 alpha may have an impact on the performance of the biofilm as a sulfide barrier. The simple method provided in this work enables the comparison of several microbial biofilms and selection of the ones with potential to prevent MIC in a relatively short time.     

通用式低温眼科装置

低温外科和低温疗法在治疗许多眼科疾病中获得了满意的治疗效果，从国内外发表的大量资料和推荐的设备证明了这一点。然而，为了使低温疗法广泛应用于临床实践中，这种疗法只有在建立了低温眼科用装置的情况下才有可能，因此，在低温眼科装置中，需要考虑以下几点。     

Single-Step analysis of individual conjugated bile acids in human bile using 1H NMR spectroscopy

¹H and ¹³C NMR spectra of intact human bile were assigned using one-dimensional (¹H and ¹³C) and two-dimensional (¹H-¹H and ¹H-¹³C) experiments. Individual conjugated bile acids—glycocholic acid, glycodeoxycholic acid, glycochenodeoxycholic acid, taurocholic acid, taurodeoxycholic acid, and taurochenodeoxycholic acid—were identified. The bile acids were quantified accurately and individually in a single step by using distinct and characteristic amide signals. Making use of ¹³C NMR, the study also suggests a way to analyze unconjugated bile acids separately, if present. Chemical shift assignments and rapid single-step analysis of individual conjugated bile acids from intact bile presented herein may have immense utility in the study of bile acid metabolism and deeper understanding of hepatobiliary diseases.     

Diode behavior of electrophoretically deposited polyaniline on TiO2 nanoparticulate thin film electrode

An inorganic/organic hetrostructure diode was constructed by the electrophoretic deposition of the p-type polyaniline (PANI) on an n-type titanium oxide (TiO2) nanoparticulate thin film. The bonding and internalization of PANI to TiO2 nanoparticulate thin film were confirmed by the morphological, structural and optical studies of electrophoretically deposited PANI/TIO2 nanoparticulate thin film. The increased size of TiO2 nanoparticles indicated the well penetration of PANI molecules into the pores of mesoporous TiO2 nanoparticulate thin film. The XPS studies of PANI/TiO2 heterostructure exhibited the surface bonding and interaction between PANI molecules and TiO2 nanoparticles. The current-voltage (I-V) characterization of PANI/TiO2 heterostructure was carried out in the forward and the reverse bias at the applied voltage ranges from -1 V to +1 V with a scan rate of 2 mV/s. The constructed Pt/PANI/TiO2 heterostructure device established diodic behavior with non-linear nature of I-V curves.