不同活化剂对石油焦基活性炭孔结构的影响

以石油焦为原料 ,Na OH,KOH和 Na2 CO3 为活化剂制备活性炭 ,采用氮气吸附考察了不同活化剂对活性炭的比表面积、中孔和微孔孔径分布、孔容积及平均孔径等孔结构的影响 .结果表明 :KOH活化制备的活性炭包含 1 nm的微孔和 4nm的中孔 ,总孔容 0 .648cm3 /g,比表面积大 ;Na OH制备的活性炭以 1 nm的微孔为主 ,占总孔容 ( 0 .1 65 cm3 /g)的 98% ,平均孔径 1 .83nm;Na2 CO3 制备的活性炭以 4nm的中孔为主 ,占总孔容 ( 0 .1 43cm3 /g)的 68.5 % ,平均孔径 3.42 nm,比表面积小 .3种样品的孔径都呈现出多峰分布特征 .KOH和 Na2 CO3 活化制备的活性炭的 N2 吸附脱附曲线属于 型 ,Na OH活化制备的活性炭吸附脱附曲线属于 型 .     

碳纳米管及C60和石墨氧化动力学机理函数的分析

The oxidation of carbon nanotubes, C60 and graphite was studied by thermogravimetric (TG) analysis and differential thermal analysis (DTA) technique, and the oxidation kinetic models of three carbon materials studied were analyzed by mechanism-function method. The results indicate that three carbon species adopt different oxidation mechanisms due to their different structures. The oxidation of carbon nanotubes with cylindrical structure follows contracting volume reaction mechanism [R3 mechanism, 1-(1-α)1/3 = kt], indicating that the oxidation of carbon nanotubes takes place from the ends to the center. For graphite with planar sandwich structure, the oxidation starts at the edges initially and gradually moves toward the center, which corresponds to contracting area phase boundary reaction mechanism [R2 mechanism, 1-(1-α)1/2 = kt]. The oxidation of C60 with spherical structure, however, is complex and apparently cannot be illustrated with a single kinetic model. The values of apparent activation energy     

The dynamic adsorption of benzene vapor on the ACF activated by phosphoric acid

The dynamic adsorption behaviors of benzene vapor on phosphoric acid‐activated carbon fiber (ACF‐P) were investigated by gas chromatography. The experimental results showed that ACF‐P that was activated at >350^°C, like steam‐activated carbon fiber (ACF‐W), has good dynamic adsorption properties for benzene vapor. However, the saturation adsorption capacities of ACF‐P and ACF‐W are different. The dynamic adsorption conditions apparently do not affect the effluent concentration before the breakthrough point, but do change the operation loading and usage efficiency. The adsorbed ACF‐P can be regenerated, and good dynamic adsorbability can be recovered by heating treatment. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1841–1847, 2002     

光催化剂SrTiO3的制备及其性能的研究

论述用化学液相共沉淀法制备SrTiO_3的最佳条件,及在不同的活化条件下对SrTiO_3光催化性能的影响。此外还研究了掺入过渡金属氧化物对SrTiO_3催化性能的改善。     

端氨基树枝状大分子/环氧树脂体系固化动力学的FTIR研究

用傅立叶变换红外光谱(FTIR)法研究了双酚A二缩水甘油醚环氧树脂(GEBA)用低代端氨基聚(酯-胺)树枝状大分子G1.0(NH2)3、G1.5(NH2)8和聚(胺-酰胺)树枝状大分子PAMAM1.0(NH2)4作为固化剂的等温固化动力学,得到了不同温度下转化率与固化时间及反应速率与固化时间的关系.与小分子固化剂相比,端氨基树枝状大分子作固化剂时环氧基转化率在反应开始时增长得更快,较高代树枝状大分子在高温下固化环氧树脂时尤其如此.在相同温度和时间下,PAMAM1.0(NH2)4/DGEBA、G1.0(NH2)3/DGEBA、G1.5(NH2)8/DGEBA体系的转化率依次增大.进一步估算了3个体系在一定转化率下的固化反应表观活化能.在相同转化率时,用G1.5(NH2)8、PAMAM1.0(NH2)4、G1.0(NH2)3作固化剂的体系表观活化能依次减小.     

中药降香对酪氨酸酶激活作用的动力学研究

酪氨酸酶是生物合成黑素的主要酶。降香有促进酪氨酸酶活性的作用。通过对中药降香的水提取液和乙醇提取液促进酪氨酸酶活性作用的观察研究及降香提高酪氨酸酶活性的动力学观察研究，得到Lineweaver-Burk曲线、动力学回归方程及米氏常数Km值。为研究中药有效成分激活黑素细胞的机理奠定了基础。     

煤矸石热活化及相变分析

系统研究了不同温度下热处理活化煤矸石的物相组成和活性组分溶出的变化规律.用差热分析、X射线衍射、红外光谱、核磁共振、电感耦合等离子原子发射光谱和扫描电镜等仪器测试分析煤矸石原矿和不同煅烧温度制备的样品的矿物组成、分子结构、29Si和27Al化学位移、活性Si4 和Al3 溶出量及微观结构.结果表明:煤矸石的活化程度随不同温度下矿物相组成及铝配位情况的变化而改变.连续性的相转变与活性硅、铝的溶出量相对应.     

活性炭制作研究进展

活性炭的研究非常活跃。原料的广泛性，工艺的先进性，产品性能的特殊性都受到活性炭使用者的广泛关注，特综述了近年来活性炭研制进展概况并对活性炭的研制作展望。     

Agent-based architecture for context-aware and personalized event recommendation

In order to offer context-aware and personalized information, intelligent processing techniques are necessary. Different initiatives considering many contexts have been proposed, but users preferences need to be learned to offer contextualized and personalized services, products or information. Therefore, this paper proposes an agent-based architecture for context-aware and personalized event recommendation based on ontology and the spreading algorithm. The use of ontology allows to define the domain knowledge model, while the spreading activation algorithm learns user patterns by discovering user interests. The proposed agent-based architecture was validated with the modeling and implementation of eAgora? application, which was illustrated at the pervasive university context.     

棕榈酸改性纳米碳酸钙的工艺研究

采用从漆蜡中提取的棕榈酸作为表面改性剂,以活化度作为改性效果主要评价指标,对纳米碳酸钙粉体进行表面改性处理,确定了最佳改性工艺条件。对改性前后碳酸钙粉体的接触角、吸油率、石蜡糊粘度、粒度分布、分散性等性能进行了比较。结果表明,经棕榈酸表面改性处理后的纳米碳酸钙粒度分布均匀,分散性、亲油性好。