微区电阻测试方法及新测试仪研制

文章对国内外开展微区薄层电阻测试的方法进行了综述，特别对改进范德堡四探针技术方法的测试原理、测试过程与测试结果进行了论述与分析，对微区电阻测试方法的进一步发展提出了一种可操作的方法，并研制出新型四探针测试样机。     

活性炭的制备及应用新进展

综述了活性炭材料研究开发的新进展。重点介绍了煤、石油焦、沥青基活性炭的制备方法及针对不同用途的活性炭改性技术，为选择合适的活化方法和制备特殊功能的改性活性炭提供了参考。     

Modified Imidazoles: Degradation Inhibitors and Adhesion Promoters for Polyimide Films on Copper Substrates

Polyimide films on copper substrates that are exposed to elevated temperatures and an oxidizing environment will be subject to degradation. In order to halt this degradation without changing the properties of the system, a polymeric agent could be placed between the polyimide and the copper. This paper will investigate three such materials that will not only slow down the degradation of the polyimide and the oxidation of the copper, but will also improve adhesion within the system. Fourier transform infrared reflection-absorption spectroscopy (FTIR-RAS) will be used to investigate the polyimide/polymeric agent/copper system.     

Synthesis, characteristics and oxygen-sensitive properties of SrMgxTi 1 − xO3 nanocrystals

SrMg_xTi_{1 - x}O₃ nanocrystals (x = 0.1–0.6) were synthesized by the stearic acid gel method. Powder samples were characterized by X-ray diffraction and X-ray photoelectron (XP) spectroscopy. The results showed that the lattice parameter a and the O 1s XP spectrum changed not only with the Mg content x but also with the grain size d of the samples. The conductivity of a thick film specimen fabricated on an aluminium oxide wafer was investigated in a nitrogen—oxygen atmosphere.     

交联剂在碳／碳复合材料沥青基体中的作用

本文从C/C复合合材料的基体入手，分析了交联剂在沥青中的交联机理，并以此为基础对中温煤沥青在催化剂作用下进行交联反应。结果表明，交联剂在C/C复合材料基体中的交联作用非常明显，不仅基体本身的残碳率及耐热程度有很大提高，而且，以它制成的C/C复合材料的抗压强度也有显著增加。     

国内外改质沥青生产的现状及其发展

煤焦油沥青是炼铝及碳素工业的重要原料之一，它地质量如何直接影响到制品的技术经济指标。近年来，随着科学技术的发展，煤焦油沥青重整改质技术引起重视。目前已有许多国家已生产出改质沥青来满足制取电炉炼钢超高功率电极以及制品铝电解板的要求证同国内对此也开始进行研制工作。介绍了国内外改质沥青生产的现状及发展，并提出了参考建议。     

SBS APP复合改性沥青的研究

采用SBS、APP复合改性渣油,可以得到性能优良的改性沥青材料。其最佳配料和共混工艺条件为:SBS/(SBS+APP)之比0.4、外掺量20%、转速1930rPm、共混时间1.0 hr,共混温度20℃。     

新型难燃输送带胶粘剂的研制

以改性氯丁橡胶为主料、多异氰酸酯为固化剂制成的新型难燃输送带胶粘剂,具有粘接强度高、耐热性好、干燥时间短、难燃等特点,在常温常压下粘接输送带接头,固化30min即可负荷运行。     

An improved enzymic method for the determination of native and modified starch

An improved method for the determination of starch by sequential hydrolysis with thermostable bacterial α-amylase and fungal amyloglucosidase is described. Glucose was determined colorimetrically by a glucose oxidase-peroxidase-chromogen system at pH 7. Native normal and waxy starches, and distarch phosphate, gave quantitative yields of glucose with a high degree of precision (coefficient of variation less than 1%). Acetylated distarch phosphate, high-amylose starch and retrograded amylose were initially treated with 1M NaOH for 30 min, then neutralised and analysed successfully as normal starch. Oxidised starch did not give a quantitative yield of glucose because of the presence of dicarboxylic groups in the polymer. For samples containing normal and waxy starch the analysis was carried out in about 4 h. The method was applied to a range of starch-containing foodstuffs and the results are reported.     

修正步冷温度曲线试验研究

按修正步冷温度曲线对经步冷脆化的 2 .2 5Cr 1Mo和在加氢反应器内运行 5a的 2 2 5Cr 1Mo试块进行了修正步冷试验 ,评定了材料的回火脆性。结果表明 ,按修正步冷曲线进行修正步冷试验能使已经脆化的材料进一步脆化 ,为加氢反应器材料损伤的研究提供了一条途径。