膜催化研究(Ⅲ)——无机膜反应器中乙醇脱氢制乙醛

应用Sol-gel法制备了无机氧化铝膜,其孔径大小集中分布在3～5nm间,透过率和分离系数均符合Knudsen扩散.将该膜用于乙醇脱氢制乙醛反应中,分别考察了反应温度、进料空速、内管吹扫气流对乙醇转化率及乙醛产率和选择性的影响,并与相同条件下的常规反应器中的结果作了比较.结果发现,用膜反应器后,乙醇转化率及乙醛产率均明显高于常规反应器,与相应的平衡转化率相比较,乙醛收率可提高5%～10%.     

Intensity Correlation,Relaxat ion Time,Intensity Fluctuation and First-Order-Like Transition of Dye Laser

Statistical properties of dye laser are studied by using the colored gain-noise model which has been presented recently. We calculate the intensity correlation function and relaxation time driven by colored pump noise and white spon taneous-emission noise simultaneously. Intensity fluctuation and first-order-like transition are analyzed too in this paper. It is found that the colored gain-noise model can describe well the anomalous statistical properties of dye laser.     

Syntheses and Olfactory Characters of Some Endo-α-Substituted-Bicyclo[2. 2. 2]-Octenyl (or Octanyl) Methanols

Sixteen title compounds were synthesized, twelve of which are new ones. Their structures were determined by 1H NMR, IR and MS, the refractive indices or melting points were measured. Odors of all the title compounds were evaluated and the structure-odor relationship was briefly discussed.     

SHAPE MEASUREMENT OF SYNCHROTRON RADIATION WITH HIGH TIME RESOLUTION

By using BWS-5k II streak camera made in China,we have measured the time structure of Synchrotron Radiation (SR) from the relatrivistic electron and positron beam bunches of Beijing Electron Positron Collider (BEPC).The dependence of SR width to the intensity of beam current and the voltage of RF source was also measured.The main data taken with 30ps time resolution in the experiment are as follows: The length of VR at E_e=1.549GeV is changed from 220ps to 670ps when the average beam current from 2mA to 30mA,the variation range of CR length at 20mA beam current is 500—700ps with RF source voltage varying between 250kV and 500kV.The time calibration uncertainty of the experiment is ±15%.The trigger jitter is less than ±200ps.     

自由基照相的光显影研究

非银盐感光材料与卤化银感光材料相比具有很高的分辨力,但灵敏度较低,限制了它的应用范围。因此,如何提高非银盐感光材料的灵敏度一直是非常活跃的研究领域。     

高效液相色谱手性固定相的研究 IV. (L,L)-二肽叔丁酰胺型手性固定相拆分α-氨基烃基膦酸衍生物对映异构体

本文制备了十种新型(L,L)-二肽叔丁酰胺型键合硅胶手性固定相, 并将其用于高效液相色谱拆分外消旋α-氨基烃基膦酸衍生物。实验结果表明拆分效果良好。本文就固定相及α-氨基烃基膦酸衍生物的结构对拆分效果的影响进行了,讨论并对拆分机制进地了初步探讨。     

醚的初始暗氧化反应机理的研究

有机化合物的空气氧化是一个历史悠久的研究课题。早在1851年Schonbein[1]就注意到醚在空气中会被氧化产生过氧化物。本世纪初,Clover和Milas分析了醚的空气氧化产物,并且对醚的氧化机理,进行了研究。     

变分量子Monte Carlo的一个新算法

提出变分量子MonteCarlo(VMC)计算的新算法-极小化方差(MV)方法.它从局域能的内部结构出发,直接削减其波动以达到将VMC的方差减到极小的目的.给出了局域能的分析表达式,导出VMC的极小方差原理,并建立方差极小化的计算步骤.     

2-磺酸基二苯胺-4-重氮盐制备及其光、热分解性质

二苯胺重氮盐由于每个分子中有二个苯环,其中末键连重氮基的苯环可与甲醛在酸性介质中发生缩聚反应^[1~3],形成的重氮树脂具有良好的感光性能,并可溶于有机溶剂或碱性显影液,极适合于制备感光胶印版,已发展成为阴图PS版最重要的感光剂^[4~7].     

DOPANT EFFECTS OF SQUARYLIUM CYANINE DYES ON FUNCTIONAL DEVICES

本文初步研究了方酸菁染料在功能器件中的应用,并探讨了相关机理。我们用方酸菁掺杂8羟基喹啉铝发光层,获得了红光有机电致发光器件;用掺杂方酸菁的联吡啶钌作光敏剂修饰TiO₂纳晶薄膜电极,有效地弥补了联吡啶钌在600nm以上红光区采光能力的不足,从而大大提高了光电化学太阳电池的总体光电转换效率。