在混凝土模拟孔隙液中癸二酸二异辛酯的缓蚀特性研究

采用动电位极化曲线和电化学阻抗谱研究了癸二酸二异辛酯在模拟混凝土孔隙液中对钢筋的保护作用.癸二酸二异辛酯的加入导致混凝土钢筋的腐蚀电位正移,对钢筋的阳极电化学过程有抑制作用.其缓蚀效果随癸二酸二异辛酯浓度增加而增加,当癸二酸二异辛酯的浓度为2%时,对含有400mg/LCl-的混凝土模拟液中钢筋电极的缓蚀效率为78.5%.氯离子含量是影响钢筋腐蚀性能和癸二酸二异辛酯阻锈剂作用的重要因素.癸二酸二异辛酯能够在钢筋表面形成沉淀性保护膜.     

Vegetation Spatial Heterogeneity of Different Soil Regions in Inner Mongolia, China

The vegetation spatial heterogeneity and ecological characteristics in different soil regions were analyzed by surveying the vegetation in 12 different soil regions of Inner Mongolia, China, including conifer- ous-broadleaf deciduous forests, shrub, grassland, and desert regions with 1122 large 2 cm × 2 cm quad- rats (actual size 30 km × 30 km, referred to as L-quadrat hereafter) in about 1.18 million km2. Each L- quadrat was divided into four small 1 cm × 1 cm quadrats (actual size 15 km × 15 km, S-quadrat). The vegetation was analyzed based on the beta-binomial distribution to describe the frequency of occurrence and spatial heterogeneity for each kind of vegetation. The weighted average of the heterogeneity of all vegeta- tion in the same soil region provides a measure of the soil regional landscape level heterogeneity which de- scribes the spatial complexity of the regional landscape composition of the existing vegetation. Comparison of the vegetation characteristics in the 12 soil regions shows that, the calcic gray soil has the highest average vegetation type per quadrat. The largest soil region is calcic chestnut soil and has the most vegetation types. Every soil region has its own dominant vegetation sequence which dominates in occurrence and dominant vegetation types which dominates in spatial heterogeneity. For the Inner Mongolian vegetation, the weighted average of the heterogeneity is 0.60 and the vegetation diversity index is 4.47.     

氯化聚氯乙烯三氯化铁催化合成乳酸异戊酯

在氯化聚氯乙烯三氯化铁催化剂存在下，由异戊醇与乳酸反应合成了乳酸异戊酯．当 ０．１ｍｏｌ乳酸、０．３ｍｏｌ异戊醇和 ０．５０ｇ催化剂一起回流加热６０ｍｉｎ，产品收率９６．９％，同时研究 了氯化聚氯乙烯三氯化铁的重复使用性能．     

异自旋中心有机铁磁体分子设计

采用量子化学从头算ＵＨＦ方法对系列异自旋三自由基体系的基态自旋耦合规律进行研究，并对组成不同的异自旋（ｈｉｅｔｅｒｏ ｓｐｉｎ）三自由基进行了系统的比较，为新型有机磁性材料的实验合成提供了理论依据。     

粉末药品磺胺甲基异Wu唑的非破坏定量分析

以磺受甲基Wu唑粉末药品的近红外漫反射光谱数据建立人工神经网络模型，预测末知样品，进行粉末药品的非破坏定量分析，并对影响网络的各参数进行讨论。     

异丙二直线公垂线的求解及其应用

阐述了用辅助投影法解异面二直线的距离，结果表明，经过一次变换能解出换面法中的两次变换问题，以及在实际工作中的应用。     

合成丁酸异戊酯催化剂的研究进展

评述了硫酸,甲烷磺酸盐、对甲苯磺酸、氨基磺酸、强酸性阳离子交换树脂、磺化聚氯乙烯树脂、六水三氯化铁、聚氯乙烯-三氯化铁树脂、氯化聚氯乙烯三氯化铁树脂、五水四氯化锡、二水氯化亚锡、三氯化铝、硫酸铝,硫酸铜、硫酸铁复盐、十二水合硫酸铁铵、硫酸钛、钛酸四丁酯、硫酸高铈、硫酸锆、壳聚糖硫酸盐、一水硫酸氢钠、固体超强酸、杂多酸、分子筛和脂肪酶等催化剂催化合成丁酸异戊酯的合成方法.     

广西为害林木的阿异虫属1新种(虫目:异虫科)

记述阿异虫属１新种——黄色阿异虫Ａｒｕａｎｏｉｄｅａｆｌａｖｅｓｃｅｎｓｓｐ．ｎｏｖ．，对新种描述，与近缘种作了比较，并附主要特征图。模式标本保存于北京林业大学昆虫标本室。     

异长叶烯甲基甲酸酯香料合成研究

以江西马尾松重质松节油为主要原料,经精馏、异构化和Prins反应合成了异长叶烯甲基甲酸酯香料。得率达到47.66％。并对反应机理和产物结构进行了探讨。