核微孔滤膜评价交联聚合物溶液封堵性质的研究

交联聚合物溶液(LPS)是由低浓度部分水解聚丙烯酰胺(HPAM)和交联剂柠檬酸铝(AlCit)形成的．提出了一种新的快速有效地评价交联聚合物溶液的方法，即用核微孔滤膜模拟油藏的微孔介质，以交联聚合物溶液通过核孔波膜的能力——封堵因子评价LPS的形成过程和封堵性能．封堵因子越小，封堵程度越大．实验结果表明，HPAM溶液的封堵因子较大，对孔径为1．2μm核孔膜的封堵程度小，HPAM与交联剂刘AlCit反应形成的LPS对核孔膜的封堵程度随反应时间的增加而增加．因此，该评价方法可以用来评价聚合物与交联剂是否发生交联反应形成LPS．     

HY沸石催化合成2-叔丁基-5-甲基苯酚

以HY沸石为催化剂,在固定床反应器中,进行间甲酚与叔丁醇的烷基化反应合成2-叔丁基-5-甲基苯酚的实验。考察了反应温度、液态空速、间甲酚与叔丁醇投料摩尔比对HY沸石催化性能的影响,并考察了催化剂的稳定性。实验结果表明,HY沸石在相对低的反应温度下表现出高活性、高选择性及稳定性,有潜在的应用价值。     

Influence of La, Y, Gd, Cu, NH4^＋ Ions and DMSO on Luminescent Property of Terbium Complexes with Sulfosalicylate

Ｔｈｅｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｏｆｏｒｇａｎｉｃｌｉｇ ａｎｄｓａｓｆｌｕｏｒｅｓｃｅｎｔｍａｔｅｒｉａｌｓｈａｖｅｒｅｃｅｉｖｅｄｅｘ ｔｅｎｓｉｖｅａｔｔｅｎｔｉｏｎ .Ｔｈｅｕｓｅｏｆｆｌｕｏｒｅｓｃｅｎｔｏｒｇａｎｏ ｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｒｅｑｕｉｒｅｈｉｇｈｆｌｕｏ ｒｅｓｃｅｎｃｅｉｎｔｅｎｓｉｔｙａｎｄｌｏｗｃｏｓｔｃｏｍｐｌｅｘｅｓ .Ｉｎｒｅｃｅｎｔｙｅａｒｓ ,ｔｈｅｆｌｕｏｒｅｓｃｅｎｃｅｅｎｈａｎｃｅｍｅｎｔｏｆＴｂ(Ⅲ )ｏｒＥｕ(Ⅲ )ｃｏｍｐｌｅｘｅ…     

Pd/Sulfated Alumina—A New Effective Catalyst for the Selective Catalytic Reduction of NO with CH4

Sulfated alumina (SA) is firstly found to be an effective support for Pd catalyst used in the SCR of NO with methane. The sulfation is important to increase support's acidity which is essential for the reduction of NO over Pd catalysts. On consideration of the lower cost and easier availability of SA, we believe that SA is more promising to act as the commercial support for Pd catalyst used in the SCR of NO with methane.     

水平管泡状流液相速度分布与相分布

用热膜探针测量了内径为 3 5mm的水平管泡状流中的液流速度 ,同时用双头电导探针测量了有关的相界面参数 ,结果表明 ,局部液流平均速度在靠管道下部的分布与单相液流的分布类似 ,在靠管道上部突然减小 ;局部液流平均速度在靠管道下部随气流折算速度的增加而增加 ,在靠管道上部则随气流折算速度的增加而减小 ;局部含气率和气泡频率随气流折算速度的增加而增大 ,在靠近管道上壁处有一峰值 ,其分布规律随液流速度的增加而趋向均匀     

Modeling and experimental verification of radiative transfer of a flat‐plate photoreactor with immobilized photocatalyst

A cost‐effective design of photocatalytic reactor needs efficient contact of the polluted substance with the solid catalyst while uniformly irradiating the solid catalyst with light. In the present paper, an immobilized photocatalyst comprising TiO₂ coated on Pyrex‐glass‐coils (abbreviated hereafter as TGC) was developed, and a flat‐plate photocatalytic reactor packed with TGC was designed. The reactor has some advantages such as low pressure drop, intensification of mass transfer; relatively uniform distribution of light radiation; high ratio of illuminated catalyst surface area to volume, and is flexible enough for large‐scale application. The radiation intensity distribution and the two‐flux model parameters were measured, and the two‐flux model was solved numerically. The experimental values were compared with the theoretical predictions. Good agreement was obtained with a maximum deviation about 10%. Finally, the two‐flux model described the radiation intensity distribution and local volumetric rate of energy absorption in the flat‐plate reactor packed with TGC. © 2002 Society of Chemical Industry     

近完全图的不同构图确定和计数的研究

本文首次定义了近完全图的概念并采用先分解后组合的方法研究出一种边数很多、接近于完全图的不同构图的确定方法及其数目的比较算法,给出了判断定理及其证明和应用。     

Dispersion and rheological properties of concentrated silicon aqueous suspension

This work focuses on the optimization of the rheological properties of silicon suspensions by changing the concentration of a dispersant and the pH value of the dispersing medium. The zeta potential and rheological properties of silicon suspensions as a function of tetramethyl ammonium hydroxide (TMAH) concentration were carried out. The results show that the isoelectric point of the silicon particles was at pH 1.6. A silicon suspension with 46 vol.% particles displayed a minimum viscosity at pH 9.6. The results also show that TMAH is an efficient dispersant by enhancing the absolute value of the zeta potential of silicon particles. The optimum dosage of the dispersant was 0.4 wt.% of silicon particles.     

碳化硼的氧化特性研究

研究了碳化硼在４００－８００℃空气中烧结时的氧化特性，采用ＸＲＤ、ＳＥＭ对氧化后的碳化硼的相结构和表面形貌进行分析。观察。结果表明，碳化硼有６００℃左右开始氧化，氧化后部分生成玻璃态的Ｂ２Ｏ３，氧化过程为热激活过程，激活能Ｑ＝１７．１７ｋＪ／ｍｏｌ。     

蜂房分组交换移动通信网的网络结构

本文给出以光纤城域网为基础的蜂房分组交换移动通信网的原理和网络结构，并给出该网络的容量和能支持的移动用户数。