二氧化钛纤维表面担载Pt纳米结构的原子力显微镜研究

通过原子力显微镜研究了二氧化钛纤维表面担载Pt的表面形貌及其结构.结果表明,TiO2纤维表面担载的Pt具有微米尺度的近似六边形或者近似长方形的结构,与在单晶TiO2(110)表面的Pt纳米簇形貌相似,但尺度较大.TiO2纤维担载的Pt表面明显存在不同高度的台阶结构,台阶高度以2~4倍Pt(111)晶面面间距的高度为主.由Pt在TiO2纤维表面的形貌与纤维的纳米晶粒排布有序性推测可知,Pt与TiO2纤维存在强的相互作用,可能正是这种强相互作用和表面台阶结构才使TiO2表面担载的Pt虽是微米尺寸但仍具有高光催化活性.     

天然水体底质中腐植酸的光谱表征

分别用紫外-可见光谱、傅立叶变换红外光谱(FTIR)、三维荧光光谱和荧光等高线谱对提取的腐植酸和商品腐植酸进行了表征，并将分析结果与Aldrich和上海试剂二厂生产的腐植酸进行了比较。结果表明：3种底质腐植酸之间以及同商品腐植酸的紫外-可见光谱、傅立叶变换红外光谱(FTIR)相似，含有相同类型的官能团。对不同腐植酸的三维荧光光谱和荧光等高线谱的分析表明其在结构上存在一定的差异；腐植酸有较明显的荧光光谱特性，可以尝试使用三维荧光光谱技术来揭示其在结构上的差异。     

新型螺环六氢山酮素-氧化吲哚-苯并呋喃酮类拼接物的合成及其抗白血病细胞增殖活性

以色酮-氧化吲哚合成子与3-烯基苯并呋喃酮为原料,在催化剂1,8-二氮杂二环十一碳-7-烯作用下,在二氯甲烷中发生Michael/Michael加成关环反应,合成了6个未见文献报道的螺环六氢山酮素-氧化吲哚-苯并呋喃酮类拼接物(3a^3f),产率75%~87%,dr值3/1~5/1,其结构经1H NMR,13C NMR和HR-MS(ESI-TOF)表征。采用MTT法研究了3a^3f对人白血病细胞(K562)的体外抗增殖活性。结果表明:化合物3c,3e和3f对K562增殖有一定的抑制活性。     

A New Approach to α—Bromochalcones

α-Bromo benzolymethylene triphenylphosphorane 3 has been synthesized by the reaction of benzoylmethylene triphenylphosphorane 1 with N-bromosuccinimide in the yield of 87% and can react with aromatic aldehydes 4 to give α-bromochalcones 5 in good yields.     

超声引导椎旁神经阻滞治疗带状疱疹后遗神经痛的疗效及可行性分析

本文对超声引导椎旁神经阻滞治疗带状疱疹后遗神经痛（post-herpetic neuralgia，PHN）的疗效及可行性进行了分析。研究对象为2015年12月~2017年12月于我院就诊的94例PHN患者，按就诊顺序随机均分为两组，对照组给予普瑞巴林常规治疗，观察组在此基础上联合超声引导椎旁神经阻滞治疗，连续治疗4周。本文比较了治疗前、治疗1周、2周、4周后的匹兹堡睡眠质量指数（PSQI）评分、疼痛视觉模拟（VAS）评分，并评价了治疗后的综合疗效，记录了治疗期间发生不良反应情况。结果显示，较治疗前，治疗1周、2周、4周后两组VAS评分均逐渐降低，且观察组治疗后各时间点的VAS评分显著低于对照组，差异具有统计学意义（P<0.05）；较治疗前，两组治疗1周、2周、4周后PSQI评分均逐渐降低，且观察组治疗后各时间点的PSQI评分显著低于对照组，差异具有统计学意义（P<0.05）；观察组治疗总有效率为89.36%，对照组为78.72%，观察组显著高于对照组，差异具有统计学意义（P<0.05）；两组治疗期间各项不良反应发生率差异无统计学意义（P>0.05）。本文证实了超声引导椎旁神经阻滞治疗PHN能显著改善患者神经疼痛症状，提升睡眠质量，同时具有安全性保障。     

Synthesis of a Novel Core-shell Type Acrylic-polyurethane Hybrid Emulsion Containing Siloxane and Fluorine as well as Water and the Oil Resistances of Cured Film

Aqueous acrylic-polyurethane dispersions have become one of the major types of materials used in coating, paint and adhesive industries, because of excellent properties and environmental advantages1-5. However, some properties for cured film such as water…     

Preparation and Characterization of Ultrafine Rare Earth Molybdenum Complex Oxide Particles

Ultrafine rare earth molybdenum (La–Mo and Ce–Mo) complex oxide particles have been synthesized by the sol–gel process using citric acid as complexing agent. The influence of preparation conditions such as thermal treatment temperature (T), molar ratio of citric acid to metallic ions (L/M), and pH value of the starting solution on the oxide particle size has been studied. The formation of La₂Mo₂O₉and Ce₂Mo₃O₁₂has been investigated using XRD, DTA–TG, FT-IR, TEM, and BET surface area measurements. It is shown that the morphology and structure of the oxide particles are significantly dependent on the preparation conditions. The influence of different preparation methods on the particle size of La–Mo and Ce–Mo oxides is also discussed.     

改进的微波辅助无溶剂法提取薄荷和陈皮中的挥发油组分

An improved solvent free microwave extraction, in which a kind of microwave absorption medium （carbonyl iron powder） was used, was applied to the extraction of essential oil from dried menthol mint and orange peel without addition of any solvent and pretreatment. It took much less time of extraction （30 min） than microwave-assisted hydrodistillation （90 min） and conventional hydrodistillation （180 min）. The kinds of chemical compositions in essential oil extracted by different methods were almost the same and such improved solvent free microwave extraction can be a feasible way in extraction of essential oil from dried plant materials.     

Effect of substituents (NH_2,OH,F) on structures and stability of lithofluorosilylenoids

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高分辨率磁旋转编码器磁鼓材料的研制

采用磁浆涂布工艺制作了磁鼓涂层材料.研究了不同组分的配方对磁鼓涂层材料性能的影响,制备出性能良好的磁鼓.对Φ32～40mm的磁鼓进行了充磁测试,写入了128和256对极.采用金属薄膜磁电阻传感探头检测磁鼓表面分布磁场,信号通过电路放大、整形后接入示波器和计数器,结果显示输出信号波形良好,计数完整.