Studies of photoconductivity in β-Apo-8′ carotenal

The photoconductive properties of a carotenoid polyene,β-Apo-8′ carotenal in polycrystalline form has been studied. The growth of the photocurrent shows an overshoot in the growth-time curve before steady state value is attained. This behaviour of photocurrent is proposed to be due to higher value of recombination coefficient than trapping coefficient. From the temperature dependence study it is observed that the steady state photocurrent, at first increases with increase of temperature, attains a maximum at a particular temperatureT _max and then decreases with temperature. TheT _max value agrees with the temperature above and below which steady state photocurrent is attained differently. Monomolecular and bimolecular recombination processes at two temperature regimes are proposed to account for the observed behaviour. The dependence of photocurrent with excitation light intensity and wavelength study provide information on the carrier generation processes. The fast decay of photocurrent have been observed at different temperatures and from this study the decay constant is calculated and it is found to be temperature independent.     

松香及其衍生物在浮选分离中的应用

介绍了松香的来源、化学组成及理化性质；讨论了松香及其衍生物在非硫化物矿浮选分离、有色金属离子的浮选分离以及从水溶液中浮选分离有机物等方面的应用情况。     

Preparation of core–shell type nanoparticles of diblock copolymers of poly(L‐lactide)/poly(ethylene glycol) and their characterization in vitro

Core–shell type nanoparticles of poly(L ‐lactide)/poly(ethylene glycol) (LE) diblock copolymer were prepared by a dialysis technique. Their size was confirmed as 40–70 nm using photon correlation spectroscopy. The ¹H‐NMR analysis confirmed the formation of core–shell type nanoparticles and drug loading. The particle size, drug loading, and drug release rate of the LE nanoparticles were slightly changed by the initial solvents that were used. The drug release behavior of LE core–shell type nanoparticles showed an initial burst during the first 12 h and then a sustained release until 100 h. The degradation behavior of LE block copolymer nanoparticles was divided into three phases: the initial rapid degradation phase, the stationary phase, and the rapid degradation phase until complete degradation. It was suggested that lidocaine release kinetics were predominantly governed by the diffusion mechanism in the initial burst phase and after that by both of the diffusion and degradation mechanisms. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2625–2634, 2002     

有机EL的稳定性和寿命

介绍了有机ＥＬ在稳定性及寿命方面的最新研究动态，着重描述了器件功能层组合的相互接触、阴极、空穴传输层玻璃化温度和驱动条件等对有机ＥＬ稳定性和寿命的影响。     

定电流对LED的重要性

高功率超高亮度LED已经开始大量应用.要实际体现LED(尤其是高功率超高亮度LED)的优点,采用定电流驱动方式必要条件之一.     

小型密闭压力容器测试系统重复性的研究

小型密闭压力容器测试（MCPVT）法是安全工程领域中近几年发展起来的、评价有机过氧化物及自反应物质受热分解反应激烈程度的新方法。pmax是MCPVT方法中用来表征自反应物质受热分解反应激烈程度的物理量之一。文中通过大量实验，研究了样品容器容积V、升温速率R及样品质量M对pmax重复性误差的影响，研究了一系列典型的有机过氧化物和自反应物质在标准实验条件下pmax重复性误差。结果表明，小型密闭压力容器测试系统重复性好，测试结果可靠，从而为MCPVT法最终成为国际上评价自反应物质受热分解反应激烈程度标准方法奠定了基础。     

用于铜的化学机械抛光液的研究

文中介绍了一种以碱性抛光液对铜进行全局平面化的方法 ,讨论了以 Si O2 水溶胶为磨料的抛光液在Cu-CMP过程中的化学 (络合 )作用及反应机理 ,并给出了抛光液的配比及上机实验结果。结果表明 :该抛光液用于对带有阻挡层和介质层的铜抛光 ,达到了对铜层的高去除速率和高选择比 ,取得了较好的全局平面化效果     

白光LED驱动方案

本文介绍了驱动白光LED的方案和典型应用电路。     

Hysys软件在分析精丙烯硫化物来源中的应用

气体分馏装置原料液化石油气 (LPG)中有机硫化物形态复杂 ,考察分析工业装置精丙烯硫化物含量变化难度大。利用Hysys模拟 ,分析判断LPG中小分子有机硫化物在气体分馏产品的分布并提出了控制措施。考虑操作条件对精丙烯硫含量的影响 ,并对工业装置精丙烯总硫超标原因进行了分析。     

迅速发展的有机电致发光(OEL)显示器件

有机电致发光显示器件以其全固体、自发光、宽视角、高对比、快响应、低功耗、更轻薄等比液晶显示器件更为优越的特性 ,在小尺寸平板显示市场上正开始向 LCD挑战