K2FeO4的合成及对含苯酚水溶液中重金属离子的去除性能

以次氯酸钙和九水硝酸铁为原料采用湿化学法合成K₂FeO₄,X射线衍射（XRD）、扫描电子显微镜（SEM）、红外吸收光谱（FTIR）、能量色散谱（EDS）的对比分析表明通过二次重结晶纯化可有效去除粗产品中的杂质,获得纯度更高、晶形更完整的K₂FeO₄晶体。同时研究了K₂FeO₄投加量、时间、溶液pH值、温度、初始离子浓度等因素下,K₂FeO₄对含苯酚水溶液中的Cu（Ⅱ）、Cd（Ⅱ）的去除性能,并通过扫描电子显微分析（SEM）、能量色散谱（EDS）、红外吸收光谱（FTIR）等方法研究了K₂FeO₄对溶液中重金属离子的去除机理。实验结果表明：K₂FeO₄可通过一步反应同时去除溶液中的Cu（Ⅱ）、Cd（Ⅱ）以及苯酚,K₂FeO₄主要通过吸附、共沉淀和表面配位的方式去除溶液中的重金属离子。     

TQX型高效旋风除尘器的设计特点及除尘机理的研究

从旋风除尘器存在的问题人手，对陶瓷材料在TQX型旋风除尘器中的应用及除尘的机理进行了研究。     

SHG Materials Based on the AlPO4-5 Single Crystals

Large AlPO4-5 molecular sieve single crystals with high optical quality were synthesized hydrothermally by using TPA as template. As-synthesized crystals were calcined under O2 atmosphere to remove the organic templates in the channels. Disperse-Red-1 (DR1) and p-nitroaniline (pNA) molecules have been successfully incorporated into the one-dimensional channels of AlPO4-5 single crystals respectively by means of vapor phase diffusion. XRD patterns reveal that the loading of organic molecules has not destroyed the structures of AlPO4-5 crystals. Polarizing microscope and SHG results indicate that the DR1 and pNA molecules are well aligned in a preferred direction along the crystal channels. The different polarization-dependence SH intensity shows that different SHG processes occur in the DR1- and pNA-loaded AlPO4-5 crystals.     

REMOVAL OF MERCURY FROM WATER USING POLYPYRROLE AND ITS COMPOSITES

One of the suitable methods for removing heavy metals from water is by using surface adsorption process. In this paper, the preparation of polypyrrole and its composites as adsorbents are discussed and the capability of separating mercury from water is investigated. The results indicated that the polypyrrole and its composites are able to remove mercury from aqueous media. Furthermore the adsorption percentage is related to the surface morphology, type of additives and its concentration.     

Synthetic Iowaite Can Effectively Remove Inorganic Arsenic from Marine Extract

For the removal of arsenic from marine products, iowaite was prepared and investigated to determine the optimal adsorption process of arsenic. Different chemical forms of arsenic (As(III), As(V)) with varying concentrations (0.15, 1.5, 5, 10, 15, and 20 mg/L) under various conditions including pH (3, 5, 7, 9, 11) and contact time (1, 2, 5, 10, 15, 30, 60, 120, 180 min) were exposed to iowaite. Adsorption isotherms and metal ions kinetic modeling onto the adsorbent were determined based on Langmuir, Freundlich, first- and second-order kinetic models. The adsorption onto iowaite varied depending on the conditions. The adsorption rates of standard solution, As(III) and As(V) exceeded 95% under proper conditions, while high complexity was noted with marine samples. As(III) and As(V) from Mactra veneriformis extraction all decreased when exposed to iowaite. The inclusion morphology and interconversion of organic arsenic limit adsorption. Iowaite can be efficiently used for inorganic arsenic removal from wastewater and different marine food products, which maybe other adsorbent or further performance of iowaite needs to be investigated for organic arsenic.     

质子照相中成像磁透镜系统对次级质子的消除

 为了解成像磁透镜系统使用对提高质子照相品质的作用,研究了成像磁透镜系统对核反应产生的次级质子的消除作用。利用MCNPX模拟了次级质子的能谱,结果表明：次级质子的平均能量不足照相质子束的50%。从次级质子的能量特性和成像系统质子运动学方面的分析表明：成像磁透镜系统可消除次级质子的影响。利用程序MCNPX对含成像磁透镜系统的质子照相进行了模拟,结果显示：成像磁透镜系统将次级质子对光程的影响减小到2%以下,显著提高了图像品质。     

一种机载合成孔径成像激光雷达聚束模式成像算法

合成孔径成像激光雷达是一种新的主动式有源的成像系统,可以获得比合成孔径雷达更高的分辨率,和更接近光学图片的效果.首先,在理想条件下分析了调频连续波的信号模型,推导出在连续波系统聚束模式下一种适用于机载合成孔径成像激光雷达系统的频率变标算法.然后,使用傅里叶变换法对符合von Karman谱的随机相位屏模拟大气湍流,并分析了Fried参量和合成孔径长度之间的关系.最后,仿真说明真空中采用方位预处理可以消除图像重影,并且补偿多普勒频移项可以消除8.6～9.3dB的能量损失和使图像散焦的现象.而在有大气影响时,合成孔径长度的选择小于Fried参量时,图像方位向可以良好聚焦.     

Approaches to eliminate near field artifact of MURA

Since the coded aperture technique has been successfully applied on X-ray imaging space telescopes, attentions of its development have also been cast on the application in medical imaging, for it has a very tempting quality to greatly enhance the detection sensitivity without gravely lowering the spacial resolution. But when the coded aperture technique is applied to image a nearby object, the so called "near-field artifact"comes up, that is, the reconstructed image has a sort of distortion. Among types of coded apertures the MURA (Modified Uniformly Redundant Array) is one of the most discussed. Roberto Arrcosi came up with the solution to remove the artifacts utilizing mask and antimask. In this article we present two ways to eliminate the second order aberration based on his work.     

K2FeO4的合成及对含苯酚水溶液中重金属离子的去除性能

以次氯酸钙和九水硝酸铁为原料采用湿化学法合成K₂FeO₄,X射线衍射（XRD）、扫描电子显微镜（SEM）、红外吸收光谱（FTIR）、能量色散谱（EDS）的对比分析表明通过二次重结晶纯化可有效去除粗产品中的杂质,获得纯度更高、晶形更完整的K₂FeO₄晶体。同时研究了K₂FeO₄投加量、时间、溶液pH值、温度、初始离子浓度等因素下,K₂FeO₄对含苯酚水溶液中的Cu（Ⅱ）、Cd（Ⅱ）的去除性能,并通过扫描电子显微分析（SEM）、能量色散谱（EDS）、红外吸收光谱（FTIR）等方法研究了K₂FeO₄对溶液中重金属离子的去除机理。实验结果表明：K₂FeO₄可通过一步反应同时去除溶液中的Cu（Ⅱ）、Cd（Ⅱ）以及苯酚,K₂FeO₄主要通过吸附、共沉淀和表面配位的方式去除溶液中的重金属离子。