影响裂解汽油二段加氢催化剂长周期运转因素及解决措施

从裂解汽油二段加氢催化剂性能、裂解汽油和操作条件等方面论述了影响该催化剂长周期运转的因素,并针对这些因素提出相应的措施,以达到延长催化剂运转周期的目的。     

吸收剂量对二甲基硅橡胶与甲基乙烯基硅橡胶分子量和凝胶含量的影响

将ＧＰＣ和特性粘数［η］测定相结合，在室温和－７８℃下，用Ｃｏ~（６０）辐射源辐照，研究了二甲基硅橡胶（ＭＱ，吸收剂量２．０５×１０~３～３．９７×１０~４Ｇｙ）和甲基乙烯基硅橡胶（ＭＶＱ，吸收剂量１０~２～１０~４）分子量和凝胶含量的变化。结果表明，辐照ＭＶＱ较辐照ＭＱ易生成凝胶，在凝胶点前的较低吸收剂量时，溶胶的分子量出现极大值，分子量分布曲线呈单峰；随吸收剂量的增加，分子量分布变窄，分子量降低；出现凝胶的吸收剂量，ＭＱ大约是ＭＶＱ的１０倍。辐照ＭＱ时，凝胶点前的溶胶的分子量分布曲线为双峰，并随吸收剂量的增加，双峰消失，分子量下降；在凝胶点时，分子量出现极大值。     

频域二元纯相位编码压缩成像

超分辨率被认为是光学成像和图像处理的"圣杯"之一.压缩感知理论的引入给出一种新的实现从单幅低分辨率图像的超分辨率重构方法,避免了传统超分辨率方法需要多幅亚像素图像的弊端.在分析压缩感知测量矩阵与光学成像系统之间对应约束异同的基础上,提出一种基于4-f光学架构的频域二元相位编码压缩成像方法,可以实现在单次曝光条件下获得的单幅低分辨率测量图像中实现超分辨率重建,不需要其他任何额外的信息采集.二元相位掩膜比均匀相位掩膜更容易物理实现,是压缩成像物理实现的一种更加可行的方案.模拟实验表明提出的方法可以有效地捕获图像的信息与高精度重建.此外,对于大尺度图像重建,该方法在重建时间方面优于Romberg提出的随机解调方法,在更符合实际方面的采样策略方面优于Yin提出的RecPC方法.     

氟化铵溶解含氟硅渣制备氟硅酸铵的实验研究

以氟化铵溶液和含氟硅渣为原料,通过化学溶解的方式,制备氟硅酸铵产品。考察了反应温度、反应时间、氟化铵溶液浓度和物料配比（氟化铵与二氧化硅的物质的量比）等不同工艺条件对氟硅酸铵收率、二氧化硅转化率的影响。实验结果表明：反应温度为93 ℃、反应时间为60 min、氟化铵溶液质量分数为20%~30%、物料配比为6∶1.1、反应体系搅拌速度为200~300 r/min时,氟硅酸铵的收率和氟化铵的转化率可控制在90%以上。     

荧光法测定N-（α-烷苯氧基）十四酰基牛磺酸钠的临界胶束浓度

研究了一类以苯氧基作疏水支链的新型阴离子表面活性剂——N-（α-烷苯氧基）十四酰基牛磺酸钠（SAPTT）水溶液的紫外吸收光谱、探针（芘）稳态荧光发射光谱及自身稳态荧光发射光谱性质．研究结果表明，荧光探针（芘）法和自身稳态荧光法可用来测定这类表面活性剂的临界胶束浓度（CMC），且测定结果与表面张力法（吊片法）接近；与荧光探针（芘）法相比，对于所研究体系，自身稳态荧光法的灵敏度和准确性均较高，所测得CMC结果与表面张力法（吊片法）能较好地吻合．     

削弱或抑制抗氧剂、光稳定剂作用的有关因素

介绍了削弱或抑制抗氧剂、光稳定剂作用的常见因素及实例，分析了防老化塑料制品发生提前老化现象的可能性和原因。     

IT认证与专业课程相适应的教学研究

随着信息技术的高速发展,IT行业人才的需求与培养成为高校教学改革面临热点问题.本文分析了传统的人才培养模式改革的必要性.通过调整专业课程体系,使IT职业认证与专业课程相适应,开创新的人才培养模式把学生培养成为高素质的技术应用型人才,从而满足市场需求.     

Studies on Macro-kinetics of Gas Phase Polymerization of Butadiene with Rare-earth Catalyst

The study of the kinetics of gas phase polymerization of butadiene with heterogeneous catalyst based on neodymium (Nd) was carried out. The effects of reaction temperature, reaction pressure, dispersing medium, and types of catalyst on kinetics of polymerization were investigated. A kinetic model with two kinds of active sites was proposed. The results show that the effects of the reaction temperature and the types of dispersing medium and catalyst on the kinetic performance of polymerization are significant, and that the combined model of first and second order decay of active site of catalyst can be used to describe the phenomena.     

Preparation and modification of macroporous epoxy‐triethylenetetramine resin for preconcentration and removal of Hg(II) in aqueous solution

A novel macroporous resin was prepared from epoxy resin and triethylenetetramine through a polymerization with phase separation. In this experiment, the polyethylene glycol (PEG‐1000) plays a very important part. It was used as solvent, as phase‐separation reagent in the preparation processes, and as the pore‐forming reagent through removing PEG‐1000 from polymer by water‐cleaning process after completing polymerization. The prepared resin was modified by carbon bisulfide and soaked in 1 mol L^?1 NaOH. Its structure was characterized by Fourier transform‐infrared spectra, scanning electron microscopy, and elemental analysis. The adsorption characteristic of the chelating resin was studied by series of experiments. The results show that the chelating resin possesses excellent adsorption characteristic toward trace Hg(II). The recovery can come to 100% when the concentration of Hg(II) is only 0.05 ppm, and the average maximum adsorption capacity of the chelating resin for Hg(II) is 122 mg g^?1. The precision (relative standard deviation) for six replicate adsorbent extraction of 0.01 μg mL^?1 Hg(II) was 1.1%. The accuracy of the proposed procedure was verified by analyzing a standard reference material. Moreover, the chelating resin was applied to two natural samples and also got satisfactory results. That is to say, the chelating resin modified by carbon bisulfide exhibits a high chelating ability toward Hg(II) and can be used as adsorbent for preconcentration and removal of trace Hg(II) in aqueous solution. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102:2372–2378, 2006