Performance of an activated carbon made from waste palm shell in simultaneous adsorption of SO<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript> and NO<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript> of flue gas at low temperature

This study examined the individual and simultaneous adsorption of SO{in{itx}} (SO{in{it2}}) and NO{in{itx}} (NO-NO{in{it2}}) on activated carbon prepared from waste palm shell. The adsorption process was examined in a fixed bed reactor at low temperatures (100\2-300\dgC). For individual adsorption without any catalytic activation, SO{in{itx}} showed good adsorption whereas NO{in{itx}} was very much poor. In the simultaneous adsorption of SO{in{itx}} and NO{in{itx}}, SO{in{itx}} showed greater adsorption affinity than NO{itx}. For palm shell activated carbon (PSAC) impregnated with metal catalyst (Ni and Ce) the concentration adsorbed profile showed that the amount of SO{in{itx}} adsorbed decreased regularly, while the amount of the adsorbed NO{in{itx}} increased irregularly. The properties of the pure and impregnated PSAC were analyzed by BET, SEM and EDX. These investigations indicated that PSAC impregnated with metal catalyst is the determining factor in the adsorption of SO{in{itx}} and NO{in{itx}} simultaneously. Supported financially by Yayasan FELDA, Malaysia (Grant No. 6050075)     

矿用产品金属外壳的电磁屏蔽效能分析

对采用单层不锈钢外壳的矿用产品的电磁屏蔽效能进行了分析与计算,得出产品金属外壳的电磁屏蔽效能与采用的金属材质、厚度以及因加工工艺形成的隙缝、开孔有关,为提高矿用产品的电磁屏蔽性能提供了工程经验。     

φ1200氨合成增效反应器的应用

分析了当前中小氮肥厂合成氨工段出塔氨含量偏低的现象，提出用氨合成增效反应器来解决这一问题，并阐述了其应用前景。     

具有硬核—软壳结构的丙烯酸聚合物乳液的研究

利用种子乳液聚合法合成了具有硬核—软壳结构的丙烯酸聚合物微粒子,通过对种子粒子数和最终粒子数的理论计算,并结合最低成膜温度(MFT)的测试结果,描述了聚合物微粒子的聚合过程,同时,还对聚合物乳液的各项性能进行了研究。     

CJ91胶粘剂在螺旋振动光整机中的应用

螺旋振动光整机槽内壁的橡皮保护层由于老化及磨损等原因出现裂口甚至脱落现象，严重影响设备的使用寿命和闸把壳体的外观质量。通过分析和试验筛选出螺旋振动光整机的理想胶粘荆——CJ91胶粘剂并介绍了粘接修补工艺。     

Factors influencing magnetic polymer microspheres prepared by dispersion polymerization

Magnetic iron oxide (Fe₃O₄) was prepared by a coprecipitation method. Core–shell composite magnetic polymer microspheres with carboxyl groups were synthesized by the dispersion polymerization of styrene and acrylic acid in the presence of magnetic oxide, and dibenzoyl peroxide was used as an initiator. The synthesized magnetic polymer microspheres were characterized with X‐ray diffraction, transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and so forth. The results indicated that the product was single‐phase Fe₃O₄, and its average size was about 10 nm. The configuration of the microspheres, which contained carboxyl groups, was spherical, and the average size was about 2 μm. The results of vibrating sample magnetometry tests showed that the magnetic powders produced by different surfactants had different saturation magnetizations. When poly(ethylene glycol) with a weight‐average molecular weight of 4000 was used as a surfactant, the saturation magnetization of the samples reached 69.2 emu/g. The factors that affected the shape, magnetism, size, and distribution of the microspheres were also studied. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

悬臂梁不同单元类型计算误差分析

为了研究悬臂梁用不同单元类型计算应力结果与真实测量值的误差和该误差产生的影响因素。首先,用ABAQUS有限元软件对悬臂梁结构进行壳单元建模和实体单元建模,分别计算出Mises应力值,再用经典材料力学方法计算出相同情况下悬臂梁Mises应力值,然后用电阻应变测试法计算出悬臂梁的真实应力值,计算出各种应力计算方法相对于真实测量值的误差。最后,分别计算不同厚度悬臂梁,用壳单元和实体单元分别计算出的Mises应力值,将实体单元计算应力值代替真实测量应力值,得到壳单元计算结果相对于实体单元计算结果的相对误差。研究结果表明,悬臂梁用实体单元计算出的Mises应力值相对于壳单元更加接近于真实测量值。随着悬臂梁厚度的增加,壳单元计算结果的精度越来越小。对于同一厚度的悬臂梁,不同位置处壳单元计算应力值对于真实值的相对误差近似为一常数。     

椭球形网壳结构静动力分析

大型的网壳结构具有受力合理、重量轻、造价低而且造型优美、形式新颖活泼等特点,成为近年来发展最快的结构形式之一。本文以某工程为例,使用ANSYS软件,结合时程分析法,对椭球形双层网壳结构进行动力分析,得到杆单元的轴力时程曲线。通过比较杆单元在不同方向的地震作用下的轴力时程曲线,分析网壳结构在地震作用下的内力规律,为今后的抗震分析设计提供依据。     

隔振支座对大跨度网壳的振动控制分析

本文通过建立了橡胶隔振支座与设置隔振支座的网壳结构的力学模型,研究了隔震支座控制下,大跨度空间单层柱面网壳结构在地震作用下振动响应,结果表明:隔震支座对结构的振动可以起到良好的控制作用,但地震强度对隔震支座耗能能力影响较大,在最大水平行程内,地震强度越大,耗能能力越强;在不同地震波作用下,隔振网壳结构体系的振动控制效果有所不同,其中:EL Centro波作用的结构被动控制效果最佳。     

提高锅壳燃气锅炉热效率的途径

随着国家对环境保护要求的重视,锅壳燃气锅炉以其环保性能突出的优点被广泛地应用.但是,目前燃气锅炉排烟温度普遍偏高(一般在180℃以上),造成很大的能源浪费已成为亟待解决的问题.本文对提高WNS型燃气锅炉利用冷凝器和预热器降低排烟温度,提高热效率作了初步探讨.