国产200 MW机组改汽动给水泵热经济性对比分析

下花园发电厂对国产２００ＭＷ汽轮机组和汽动给水泵必需 国内尚属首次。该项目应用普遍，涉及面广，具有重要的经济意义，结果值得借鉴。为此，根据下花园发电厂１９９８年７月进行的汽动泵与电动泵的工业性对比试验结果，该项目进行了热经济性分析和对比性研究。     

连续包覆型腔内应变分布的三维光塑性实验研究

以聚碳酸酯为模型材料, 首次采用三维光塑性方法对连续包覆型腔内金属流动过程进行了模拟实验研究,给出了稳态变形阶段型腔内的三维应变分布。分析了型腔内应变分布的特点,给出了金属在型腔内的流动规律     

丝绸之路河西地区魏晋墓彩绘砖画——六博新考——六博新考

对我国河西地区汉魏墓出土的多幅六博砖画和木俑博戏,作者以图像和文献相参照,重新确认砖画表现的形态应该是樗蒲和博塞而非六博.这一考证,不仅发现了弥足珍贵的樗蒲和博塞图像,而且也为人们研究河西地区博戏的演变和古人的游艺活动方式提供了实证.     

Effect of different doping methods on microstructure and photo-catalytic activity of Ag2O–TiO2 nanofibers

Ag⁺ doping TiO₂ nanofibers were prepared by in-situ and immersion methods (named as SI-TiO₂ and IM-TiO₂ nanofibers, respectively). This paper assesses the effects of the two different doping methods on the material properties. Results show that the two kinds of nanofibers with the diameter of about 20 nm are micron-sized length, and covered by nano-balls of Ag₂O with the diameter of 2–5 nm. Compared to IM-TiO₂ nanofibers, the SI-TiO₂ nanofibers have fewer Ag₂O particles. Thus, the photo-catalytic activity of IM-TiO₂ nanofibers is higher than SI-TiO₂ nanofibers, which is also proved in photo-catalysis experiment (the degradation ratio of IM-TiO₂ catalyst is 100%, and the degradation ratio of SI-TiO₂ catalyst is 95%).     

Current–voltage characteristics of AlCdO Schottky contact on the polished and unpolished p-type Si surfaces with and without light illumination

In this study, the current-voltage characteristics of the AlCdO/unpolished p-type Si and AlCdO/polished p-type Si Schottky diodes with and without light illumination were examined. It is found that the Schottky barrier height (the series resistance) of the AlCdO/unpolished p-type Si Schottky diode is higher (lower) than that of the AlCdO/polished p-type Si Schottky diode. The power conversion efficiency of the AlCdO/p-type Si devices in the light (AM 1.5 G, 100 mW/cm²) was improved by increasing built-in potential at the AlCdO/p-type Si interfaces and reducing the device series resistance and surface reflectivity. It is shown that the device surface roughness plays an essential role in improving the device performance.     

Synthesis and characterization of efficient luminescent materials based on 2,1,3-benzothiadiazole with carbazole moieties

Two new luminescent materials named 4-bromo-7-carbazyl-[2,1,3]-benzothiadiazole (3) and 4,7-dicarbazyl-[2,1,3]-benzothiadiazole (4) were obtained by a modified Ullmann reaction in one step from 4,7-dibromo-[2,1,3]-benzothiadiazole (2) (based on 2,1,3-benzothiadiazole (1, BTD)) and carbazole. The structure and purity of them were characterized by crystal structures, ¹H NMR and elemental analysis. Compared with compounds 1 and 2, the compounds 3 and 4 have better optical properties and thermostability due to the introduction of the carbazole moieties, and the compound 4 shows better performances than that of compound 3. For compound 4, a strong absorption peak at 236 nm with a high extinction coefficient up to 1.205 × 10⁵ L·mol·cm^?1 and bright green to orange photoluminescence with quantum yields of 9.0%, 48.4%, 51.0% and 75.6% in different solvents of acetonitrile, dichloromethane, ethyl acetate, and diethyl ether, respectively, were measured.     

Discoloration mechanism of polymer surface in contact with air–water interface

The white-colored inner surface of a polypropylene (PP) material containing water discolored and turned yellow. The discoloration occurred selectively on the surface at the point of contact with the air–water interface. Since the polymer surface was exposed to water in darkness at room temperature, no sign of deterioration or degradation of the polymer at the discolored surface was confirmed. This study conducts an in-depth analysis of the discoloration mechanism of the polymer surface. A variety of technical approaches, including microscopic, spectroscopic, and chromatographic analysis techniques, were used to investigate the nature of discoloration and the root cause. From the analysis results, the discoloration was ascribed principally to a phenol transformation compound having the structure of a quinone methide, which was identified as a degradation product of a primary antioxidant. Based on the observations and experimental results, a plausible discoloration mechanism was proposed.     

煤与瓦斯突出保护层开采技术研究现状初探

随着开采深度的不断增加,煤与瓦斯突出日趋严重.通过对最经济、有效的区域性防突措施保护层开采技术的研究,分析了保护层开采技术的应用现状,总结了保护层开采预防突出的机理、保护层开采保护范围的判别准则以及划定有效保护范围的方法,提出保护层开采技术的研究和发展方向.     

石门拱坝拱冠梁长期变形性态分析

石门拱坝拱冠梁的变形特性与常规情况有所差异，但符合其地质情况和坝体构造，通过定性和定量的方法，对石门供坝拱梁长期变形性态的变化规律及主要的影响因素进行了分析。     

苯乙酮-d_8镍-铝合金液相还原合成苯乙醇-d_(10)

以氘代苯 ｄ６Ｃ６Ｄ６及氘代醋酸 ｄ４ＣＤ３ＣＯＯＤ等为原料制得氘代苯乙酮 ｄ８Ｃ６Ｄ５—ＣＯＣＤ３，在２０～５０℃下，于１０％～２０％（ｗ）ＮａＯＤ重水溶液中用镍－铝（Ｎｉ－Ａｌ）合金还原，制得了产率８５．２％、氘代率９９．２％的氘代α 苯乙醇 ｄ１０Ｃ６Ｄ５—ＣＤＯＤＣＤ３。本文介绍了氘代苯乙酮 ｄ８的Ｎｉ－Ａｌ合金液相还原反应工艺，并对温度、助溶剂氘代甲醇 ｄ４ＣＤ３ＯＤ的用量、ＮａＯＤ的质量分数等影响产物产率的主要因素进行了较为详尽的探讨