精馏意识在空分系统操作中的运用

介绍精馏意识在空分系统操作中运用 ,举例说明了一种从全局角度考虑问题的方法 ,使操作更有预见性 ,保持精馏工况的稳定性。     

Preparation of CaS∶Eu~(2 ), Sm~(3 ) by Solid Reaction Method and Its Photostimulated Luminescence

Thereisanurgentneedonopticalstoragemateri alswiththedevelopmentoflaserandopticalstoragetechnologyinrecentyears .Electrontrappingopticalstoragematerials (ETM )isanewtypeofopticalstor agematerials .Theybasicallyarewide band gapⅡ Ⅵsemi conductorcompoundsdopedwithtwotypesofselectedrareearthelementsthathavegroundstatesandexcitedstateswithinthewidebandgapoftheⅡ Ⅵsemiconductorcompoundhostmaterials .Lighten ergyisstoredinthiskindofmaterialbyexposingittoultravioletorvisiblelightandisreleasedthro…     

用分布式防火墙构建网络屏障

本文介绍了分布式防火墙的结构,工作原理和实现策略.分析了分布式防火墙对各类问题的解决机理.最后作者指出了分布式防火墙存在的一些问题.     

Investigation of Structure and Hydriding Properties of La0.6 Nd0.4 Ni4.8 Mn0.2 Cux Alloys

The structure and hydriding performance of La0.6Nd0.4Ni4.8Mn0.2Cux (x = 0 ～ 0.4) alloys were investigated in order to develop suitable materials for metal hydride air conditioner. The effect of Cu addition on the crystal structure,equilibrium pressure, hydrogen capacity and hysteresis as well as hydrogen absorption/desorption kinetics were systematically studied by using the measurement of P-C isotherms, X-ray diffraction and scanning electron microscopy. As the amount of Cu increases, the plateau pressure increases and hydrogen absorption/desorption kinetics is improved, but the effective hydrogen storage capacity decreases. It is shown that variations in the basal plane parameter a can be used as an indication for the plateau pressure changes. With the increase of parameter a, the plateau pressure decreases. For La0.6 Nd0.4Ni4.8Mn0.2Cux(x = 0 ～ 0.4) alloys there is a relationship between the effective hydrogen storage capacities and the ratios of their unit cell parameters c and a. The effective hydrogen storage capacity decreases with increase of a/c.     

配合煤选择性粉碎工艺的应用

介绍了配和煤选择性粉碎工艺的原理、特点及应用情况。结果表明该工艺投用后，配合煤质量明显改善。     

ZA-92型甲苯歧化与烷基转移催化剂的研制与工业应用

研制成ZA-92型甲苯歧化与烷基转移催化剂,在反应压力3.0MPa、WHSV1.32h^-1、氢烃分子比6.7/1下反应500h,反应温度380~392℃,转化率41.89mol%。苯加C₈A选择性97.00mol%。在398kt/a引进装置上工业运转701天,在反应压力3.0~3.2MPa、反应温度353~383℃、平均WHSV0.91h^-1条件下,转化率40.18mol%,选择性96.65mol%,其特点是反应温度低,提温速度慢。现仍在继续运转中,尚未再生,预期第一运转周期在三年以上。     

Electrochemical micromachining of nitinol by confined-etchant-layer technique

The confined etchant layer technique has been applied to fabricate complex three-dimensional microstructures on nitinol for the first time. HF and HNO₃ were locally and simultaneously electrogenerated at the mold surface to etch a nitinol workpiece. NaOH was used as an efficient scavenger to confine the etchant close to the mold. Cyclic voltammetry was employed to study the electrochemical behavior of a Pt electrode in the etching solution in order to choose an appropriate potential for etchant generation on the mold. The thickness of the confined etchant layer was estimated to be several micrometers by inspecting the deviation of the sizes of the etched spots from the sizes of those on the microelectrode. Thus, the composition of the electrolyte could be optimized for better etching precision. By optimizing the composition of the electrolyte, complex microstructures on a Pt-Ir mold bearing the logo “XMU” of Xiamen University were successfully fabricated on nitinol. The etched patterns were approximately negative copies of the mold, and the precision of duplication could easily reach the micrometer scale.