微波改性对活性炭及其甲醇吸附的影响

分别在600,700和800℃下对活性炭进行微波辐照加热改性.采用比表面积及孔径分析仪、Boehm滴定、傅立叶转换红外光谱对活性炭的物化性质进行表征.并且在10℃下以甲醇为吸附质进行固定床吸附实验.研究表明:微波改性后,活性炭的比表面积、总孔容小幅度减小,但微孔比表面积显著增大;随着温度升高,活性炭表面酸性基团大量分解,碱性基团逐渐形成.Langmuir方程和Freundlich方程均能较好的描述甲醇在活性炭上的吸附.准二阶动力学方程最适合描述甲醇的动态吸附过程,说明甲醇吸附是一个物理和化学复合的吸附过程,吸附受到活性炭表面官能团的影响.颗粒内扩散模型拟合结果分为3个线性阶段:表面吸附阶段、渐近吸附阶段和吸附平衡阶段.微波改性后活性炭对甲醇的吸附能均增大,吸附能与活性炭表面含氮官能团总量成正比.     

脲醛树脂包膜缓释氮肥的制备及缓释性研究

脲醛树脂可作为缓释氮肥的包膜材料.这种膜是经过缩合聚合过程得到的相对分子质量不同的线性或支链型树脂,具有明显缓释作用.通过浸泡试验,可以得出这种树脂膜的缓释速度,定量地检验出这种膜的缓释效果.     

我国“情报学”术语研究文献综述

在情报学名词术语的选词过程中,课题组遇到了其他学科很少见到的问题。本文以＂信息＂＂情报＂＂情报学＂这些基本术语为例,以文献调查的形式进行内容综述,并从学者观点、文献考证、国外情报界、改名历程几个方面分别阐述,以引起关注、达成共识。     

辛伐他汀对小鼠结肠癌细胞CT26凋亡的诱导作用及机理研究

考察了辛伐他汀对小鼠结肠癌细胞CT26生长率的影响,并探究其对CT26细胞凋亡的诱导作用及机理。以四甲基偶氮唑盐微量酶反应比色法测定辛伐他汀对CT26细胞生长的抑制情况;以蛋白质免疫印迹法测定细胞凋亡和增殖的标志蛋白PARP、Cleaved-PARP、P21和磷酸化的P53的蛋白表达水平;以AMPK的抑制剂Compound C来阻断AMPK信号途径后,观察辛伐他汀对CT26细胞中Cleaved-PARP表达的影响;以Compound C处理CT26细胞后,以RT-PCR和蛋白质免疫印迹法测定辛伐他汀在CT26细胞中诱导KLF2和KLF4的情况.辛伐他汀可以明显抑制CT26细胞生长,可以诱导CT26细胞中的凋亡相关的Cleaved-PARP蛋白上升,并且其作用机理可能和KLF4的上升有关.     

Peptide antigens for gamma/delta T cells

γδ T cells express adaptive antigen receptors encoded by rearranging genes. Their diversity is highest in the small region of TCR V–J junctions, especially in the δ chain, which should enable the γδ TCRs to distinguish differences in small epitopes. Indeed, recognition of small molecules, and of an epitope on a larger protein has been reported. Responses to small non-peptides known as phospho-antigens are multi-clonal yet limited to a single γδ T cell subset in humans and non-human primates. Responses to small peptides are multi-clonal or oligo-clonal, include more than one subset of γδ T cells, and occur in rodents and primates. However, less effort has been devoted to investigate the peptide responses. To settle the questions of whether peptides can be ligands for the γδ TCRs, and whether responses to small peptides might occur normally, peptide binding will have to be demonstrated, and natural peptide ligands identified.     

基于择优学习策略的差分进化算法

传统的差分进化算法在个体变异方面只是利用了随机个体和最优个体的信息.由于选用个体的随机性,导致其搜索效率比较低并且有可能找不到最优解,为此,提出了基于择优学习策略的差分进化算法.该算法选择性地利用种群中比较优秀的个体的信息,克服种群进化过程中的盲目性,增强了搜索能力.通过对多个具有不同特性的标准测试函数进行测试研究,结果表明该方法可以明显减少迭代次数,提高计算效率.     

K3,5,p的点可区别的一般全染色

首先, 利用色集合事先分配法, 反证探讨完全三部图K_3,5,p(p≥5)的点可区别一般全色数, 给出当p较小时的特殊性证明以及当p逐渐增大时的规律性证明; 其次, 利用构造染色法对完全三部图K_3,5,p进行染色, 给出染色方案. 染色的成功验证了反证法所证明色数的正确性, 从而解决了完全三部图K_3,5,p的点可区别一般全染色问题.     

完全二部图K_(6,n)(6≤n≤38)的点可区别E-全染色

考虑完全二部图K_(6,n)(6≤n≤38)的点可区别E-全染色.利用组合分析法、反证法及构造染色的方法,给出一类特殊完全二部图的点可区别E-全染色.结果表明:当6≤n≤10时,K_(6,n)的点可区别E-全色数为5;当11≤n≤38时,K_(6,n)的点可区别E-全色数为6.     

Temporal and Spatial Conversion Analysis of Soil Erosion in the Three Gorges Region Based on RS and GIS Technique——A Case Study in Kaixian County

In this paper, Kaixian County, situated in the hinterland of the Three Gorges Reservoir Region, was selected for the case study. Factors of soil erosion were obtained based on the technique of remote sensing （RS） and geographic information system （GIS）. Combining with field survey, soil erosion data in the years of 1988, 2000 and 2004 which covered the period from the beginning of the Three Gorges Reservoir Project to nowadays were investigated through the judgment model established on soil erosion intensity. With the function of spatial analysis in the geographic information system, the analysis and appraisal of dynamic soil erosion changes were carried out, and the spatial characteristics of the vicious change were highlighted, and the main causes of the vicious change of soil erosion were explored.