有机半导体9，9＇-联二蒽的合成及其结构表征

详细叙述了利用9-溴蒽为原料制备高纯9,9＇-联二蒽的方法,通过红外光谱、核磁共振谱、质谱对其结构进行了表征,并通过X射线衍射谱和紫外-可见光光谱分析了其成膜结晶性能和光吸收特性。     

有机半导体9,9'-联二蒽的合成及其结构表征

详细叙述了利用9-溴蒽为原料制备高纯9,9'-联二蒽的方法,通过红外光谱、核磁共振谱、质谱对其结构进行了表征,并通过X射线衍射谱和紫外-可见光光谱分析了其成膜结晶性能和光吸收特性.     

主链插入苯并二(口恶)唑环的PPV聚合物的合成及其光电性质

以对氰基氯苄和4,6-二氨基间苯二酚为主要原料,首先合成2,6-二(4-氯甲基苯基)苯并[1-2,4-5']二(口恶)唑,又通过2,6-二(4-氯甲基苯基)苯并[1-2,4-5']二(口恶)唑与对苯二甲醛的Wittig反应,设计合成了一种新的主链插入苯并[1-2,4-5']二(口恶)唑环的PPV聚合物(BO-PPV),通过红外光谱、核磁共振谱、凝胶渗透色谱等分析方法对其结构进行了表征.并研究了该聚合物的光电热物理特性,结果表明:该聚合物的Tg为235℃,Td为410℃,电致发光谱峰值λmax为494 nm,由ITO/BO-PPV/A1组成的单层器件在电压15伏特,发光亮度可达650 cd/cm2,发光效率0.24cd/A.     

基于功率-幅值谱的炮膛疵病图像识别

在基于机器视觉的炮膛疵病检测中,针对计算机不能以"目标分割-特征提取-特征分析-判定"的经典思路实现疵病图像识别的难题,采用二次谱分析方法从图像全局性特点中挖掘疵病的信息.定义图像二次谱为"图像功率谱的对数幅值谱",提取其亮线长宽比以及谱图能量均值、能量方差和能量矩4个参量采分析炮膛图像中是否存在疵病.通过实验验证了参量的有效性.     

4,6-二硝基苯并氧化呋咱钠盐的合成表征

以苦基氯为初始原料,经过叠氮化,脱氮环化合成4,6-二硝基苯并氧化呋咱。4,6-二硝基苯并氧化呋咱与无机钠盐反应合成其钠盐。通过红外图谱、1 H-NMR、13 C-NMR、元素分析、有机质谱等分析对其结构进行了表征。综述分析上述分析数据并通过C-H相关二维谱的分析基本确定了4,6-二硝基呋咱钠盐的结构为7-羟基-4,6-二硝基苯并氧化呋咱钠。     

主链插入苯并二噁唑环的PPV聚合物的合成及其光电性质

以对氰基氯苄和4，6-二氨基间苯二酚为主要原料，首先合成2，6-二（4-氯甲基苯基）苯并[1-2，4-5＇]二噁唑，又通过2，6-二（4-氯甲基苯基）苯并[1-2，4-5＇]二噁唑与对苯二甲醛的Wittig反应，设计合成了一种新的主链插入苯并[1-2，4-5＇]二噁唑环的PPV聚合物（BO-PPV），通过红外光谱、核磁共振谱、凝胶渗透色谱等分析方法对其结构进行了表征。并研究了该聚合物的光电热物理特性，结果表明：该聚合物的Tg为235℃，Td为410℃，电致发光谱峰值λmax为494nm，由ITO／BO-PPV／Al组成的单层器件在电压15伏特，发光亮度可达650cd／cm^2，发光效率0．24cd／A。     

一种基于D-π-A型芴衍生物的合成、核磁共振谱及光谱性能研究

合成了一种具有D-π-A结构特征的新型芴衍生物:2-(2,4-二氟苯基)-7-(4-甲氧基苯基)-9,9-二辛基芴(1)。通过元素分析、红外光谱(IR)以及全面的一维核磁共振氢谱(1 H NMR)、碳谱(13 C{1 H}NMR)、氟谱(19F{1 H}NMR)对其结构进行了全面表征。通过优化反应物的投料顺序,得到较为合理的合成方法。详细分析了核磁共振谱谱线特征。利用紫外-可见吸收和荧光光谱研究了化合物的发光性能。结果表明,在CH2Cl2溶液中,化合物1在300~330nm波段有吸收峰,归属于π-π*跃迁;其光学带隙Eg为3.39eV,发射峰值位于383nm,并且具有强烈的深蓝色荧光发射(激发波长为310nm),在CH2Cl2溶液中量子效率达到0.70。此外,化合物1的吸收和发射光谱具有溶剂极性依耐性。     

新型可溶性酞菁锌的微波合成和光谱性质

以3-(4-甲基-2-叔丁基苯氧基)邻苯二腈和乙酸锌为原料,通过微波辐射法合成了1,8,15,22-四-(4-甲基-2-叔丁基苯氧基)酞菁锌,通过红外光谱、紫外-可见光谱和质谱表征了其结构,并研究了取代基结构对其吸收光谱和荧光光谱的影响。     

双极型均二苯乙烯发光材料的合成和光电特性

已发现三苯胺基和苯并(噁)唑是优良的有机共轭发光材料电荷传输基团.将三苯胺基作为空穴传输基团和苯并(噁)唑作为电子传输基团引入均二苯乙烯分子中,设计并合成了四个新双极小分子发光物质4-二苯氨基-4‘-(2-苯并(噁)唑)均二苯乙烯.通过光谱分析和元素分析等方法确认了其化学结构.所合成化合物的相关分析结果表明化学结构、取代基效应、溶剂环境等因素对其UV-Vis光谱、荧光光谱、荧光量子产率、电致发光谱和启亮电压都产生一定的影响.     

吲哚啉螺吡喃的合成及其光致变色性质研究

从小分子出发通过一系列的合成步骤,最终合成了3,3-二甲基-N-乙基-6’-硝基苯并螺吡喃(SP1)、3,3-二甲基-N-乙基-5-氯-6’-硝基苯并螺吡喃(SP2)和3,3-二甲基-N-乙基-5-甲氧基-6’-硝基苯并螺吡喃(SP3)3种未见文献报道的螺吡喃。通过元素分析、红外光谱、核磁共振等手段对合成的部分中间体和目标产物的结构进行表征,并应用紫外-可见吸收光谱对其光致变色性进行了研究。     

The Performance and Capability of Cesium Beam Frequency Standards at the National Bureau of Standards

NBS II, the older of the two cesium atomic beam frequency standards which are used alternatively as the United States Frequency Standard, has been operating for more than five years. The contribution to inaccuracy produced by uncertainties in the C field has been reduced by a factor of 30 to ±2 × 10-13. The average precision of measurement (standard deviation of the mean) has been demonstrated to be 1 × 10-12 for averaging times of 1 hour and 2 × 10-13 for 12 hours. The overall accuracy is considered to be ±8 × 10-123?. A new cesium standard, NBS III with an interaction length of 3.66 meters is in operation and has demonstrated an improved precision of 1 × 10-13 over 2 hours and an accuracy of ±5 × 10-123?. The C field contributions to inaccuracy in this machine have been reduced to ±1 × 10-13. Considerable effort has been devoted to the detection and elimination of small frequency shifts produced by various electronic components of the excitation systems. In spite of the various improvements effected, a small unexplained difference in frequency of about 1 × 10-12 continues to exist between the standards. The extremely high stability of the difference frequency, however, suggests that resolution of the difficulties should result in an accuracy capability of perhaps ±1 × 10-123?.     

Comparison of shortwave and longwave measuring thermal-imaging systems

A comparison study of shortwave (3-5-μm) and longwave (8-12-μm) measuring thermal imaging systems has been conducted. The study was limited to systems working in indoor conditions, as is typical in many industrial and scientific applications. A theory of the influence of measurement conditions and system parameters on the accuracy of temperature measurements has been developed. On the basis of the developed formulas an analysis of the influence of signal disturbances (because of incorrectly assumed emissivity, radiation reflected by the object, radiation emitted by system optics, limited transmittance of the atmosphere, and limited temperature resolution of the system) on the accuracy of temperature measurement has been made. It has been found that the shortwave systems in typical measurement conditions offer generally better accuracy in temperature measurement than the longwave ones do.     

Electrochemical performance of a graphene-polypyrrole nanocomposite as a supercapacitor electrode

A unique nanoarchitecture has been established involving polypyrrole (PPy) and graphene nanosheets by in situ polymerization. The structural aspect of the nanocomposite has been determined by Raman spectroscopy. Atomic force microscopy reveals that the thickness of the synthesized graphene is ～ 2 nm. The dispersion of the nanometer-sized PPy has been demonstrated through transmission electron microscopy and the electrochemical performance of the nanocomposite has been illustrated by cyclic voltammetry measurements. Graphene nanosheet serves as a support material for the electrochemical utilization of PPy and also provides the path for electron transfer. The specific capacitance value of the nanocomposite has been determined to be 267 F g(-1) at a scan rate of 100 mV s(-1) compared to 137 mV s(-1) for PPy, suggesting the possible use of the nanocomposite as a supercapacitor electrode. After 500 cycles, only 10% decrease in specific capacitance as compared to initial value justifies the improved electrochemical cyclic stability of the nanocomposite.     

微弧氧化技术在制备纳米TiO2光催化剂中的应用

进行了微弧氧化法在制备TiO2光催化剂中的应用研究,考察了各工艺条件对制备的TiO2光催化剂降解甲基橙的活性影响,发现以0.11 mol/L磷酸为电解液,放电5min制备的催化剂活性最佳,120min内使甲基橙脱色率达49%.通过超声处理和重复使用对催化剂进行考察,发现其表现出良好的稳定性.表征结果表明文中以钛为阳极进行微弧氧化,其表面形成的陶瓷层为多孔的、纳米级的锐钛矿型的TiO2.     

Ti基大块非晶合金研究进展

钛合金由于具有高的比强度，在许多领域中得到广泛应用。Ti基大块非晶合金具有更高的比强度，是极具发展潜力的机构材料。本文综述了Ti基大块非晶合金的成分设计、玻璃形成能力、制备技术及机械性能，介绍了目前该领域的研究现状。     

Nanofunctionalisation for the treatment of peripheral nervous system injuries

A construct based on the electrostatic layer-by-layer self assembly technique has been fabricated, to be used as a tailored device to encourage nerve regeneration. A multilayered nanocoating composed of three precursor bilayers of cationic poly(dimethyldiallylammonium) chloride (PDDA) and anionic poly(styrenesulfonate) (PSS), followed by bilayers of poly-D-lysine (PDL) and antibody specific to transforming growth factor 1 (anti-TGF-1), has been deposited on HYAFF 11. The assembly process has been monitored by quartz crystal microbalance (QCM) for its characterisation and then it has been used on HYAFF 11. Structural studies of the resulting multilayers confirmed stepwise deposition of anti-TGF-1, with an average layer thickness of 2.2+/-0.2 nm and an average surface density of 0.36+/-0.03 mug cm(-2). Scanning electron microscopy has been used to characterise multilayer uniformity. Finally, the immunological activity of the multilayered structure has been assessed. The results show that anti-TGF-1 can be included in its active form in a predetermined multilayered structure onto HYAFF 11 with quantitative control of layer thickness and weight, providing a high tool with great potential in tissue engineering.     

Capillary electrophoresis of amino sugars with laser-induced fluorescence detection

3-(4-Carboxybenzoyl)-2-quinolinecarboxaldehyde has been utilized as a precolumn derivatization agent for various amino sugars. Constituents of various biological mixtures can be converted to highly fluorescent isoindole derivatives, separated by high-performance capillary electrophoresis and determined at attomole (10(-18) mol) levels by a laser-induced fluorescence detector. This method has been applied to the analysis of monosaccharides and acid-hydrolyzed polysaccharides. Carbohydrate moieties derived from a glycoprotein were also tagged and determined.     

Sensing properties of two-component Langmuir-Blodgett layer and its porous derivative in SAW sensor for vapors of methanol and ethanol

Two-component Langmuir-Blodgett film has been fabricated from equimolar mixture of 5-[[1,3-dioxo-3-[4-(1-oxooctadecyl)phenyl]propyl]amino]-1,3-benzenedicarboxylic acid with cetylamine. Porous one-component derivative of this film has been obtained by removing of cetylamine. Both films have been investigated as sensing layers of the surface acoustic wave sensors for vapors of methanol and ethanol in air. These films react on the alcohol vapors. Time of the sensor reaction is less than 2 s and this reaction is reversible. The response parameters of the sensor depend on the kind of the alcohol and the structure of the layer. An explanation of the observed differences in the behavior of both layers in contact with vapors of the alcohols has been proposed.     

热障陶瓷基复合涂层的显微组织分析

本文通过电子显微镜和X衍射分析仪对陶瓷基复合耐热涂层(Al_2O_3-FNA_1-Cu)的显微组织进行了研究。着重分析了火焰喷涂陶瓷基复合粉末涂层的扩散反应和液相烧结,以及晶粒细小等特征。文中还讨论了这些显微结构特征对徐层结合强度、耐热性能和抗热震性能等的影响。     

A New Method to Obtain TiN-Ti(C,N)Composite Film

A new method has been studied to obtainTiN-Ti(C,N)composite film by laser-induced re-action in order to modify the surface properties ofsubstrate.An apparatus for this new technology hasbeen developed.The main reaction,the influence ofmain processing parameters on the formation,composition,microstructure and properties of thefilm have been researched.The average hardness ofthe film is up to HK 2700-2800.The wear resist-ance of the film is higher than that of the substrateby a factor of 9-11;and the film has good adhesivestrength with the substrate.